US1847039A - Interlocking mechanism - Google Patents

Description

s'sheets-sheet 1 ATTORNEY Feb. 23, 1932. E. L. DUNN INTERLOCKING MECHANISM Filed Feb. 27, 1930 Y Wu "1171 FIQIO Feb. 23, 1932. E, DUNN 1,847,039

. INTERLOCKING MECHANI SM Filed Feb. 27, 1930 5 Sheets-Sheet 2 Feb. 23, 1932. E. DUNN INTERLOCKING' MECHANISM F'iled Feb. 27, 1930 5 Sheets-Sheet 5 (2W LA U INVENTOR ATTORNEY v Patented Feb. 23, 1932 Qumran srares PATENT OFFICE EDWARD LEE DUNN, 0F EEC-NTCLAIR, NEW J ERSEY, ASSIGNOR T0 OTIS ELEVATOR COH- PANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY rn'rERLocrane MECHANISM Appiication filed February :27, 1930. Serial No. 431,743.

The invention relates to interlocking mechanisms for the hatchway doors of elevator installations.

In the development of the elevator art it has been found desirable, particularly in clevator installations of the automatic push button type, to provide locking means for the hatchway doors in addition to the conventional manually operated latch mechanisms in order to lessen the possibility of injury to,

persons due to their opening a hatchway door and falling in the hatchway or being struck by the elevator car while it is in motion. It is preferable that the hatchway doors, other than at the landing at which the car is positioned, be locked in closed position and that all the hatchway doors be locked in closed position while the car is in motion; It is also desirable to provide switches controlled by such locking mechanisms and arranged in a control circuit for the elevator car, such as the starting circuits therefor, to prevent the operation of the elevator car when'any hatchway door is not locked in closed position.

A feature of the present invention resides in the provision of means for locking the latching means for a hatchway door in latching position.

A second feature resides in preventing the unlatohing of the hatchway doors at landings other than that at which the elevator car is positioned.

A third feature resides in unlocking the latching means for the hatchway door at the landing at which a stop is to be made upon arrival ofthe elevator car thereat.

A fourth feature resides in interrupting the control circuits for the elevator car, to prevent its operation, when the door is unlatched. 1 I

A fifth feature resides in the provision of means moving with the hatchway door as it is opened for maintainingthe control circuits interrupted while the door is open.

A sixth feature is the provision of circuit controlling mechanism at one side of a hatch- Wayv door which is controlled by door latching means at the opposite side of the door.

A seventh feature resides in the provision of latching mechanism at the forward side of a hinged hatchway door in conjunction with the door casing to latch the door in closed position. A shaft rotatably mounted in the door casing carries a locking lever projecting through an opening formed in the hinged side of the door. The locking lever has an extension adapted to be seated in a recess in member carried by the door, at-thehinged side thereof. A bell crank lever mounted on the door casing is biased to position the end of one arm of the bell crank in'the path of movement of alug on a collar fixed to the shaft which carries the locking lever. hen the end of the arm of the bell crank is thus positioned, rotary movement of the shaft carrying the locking lever is prevented. Vhen rotary movement of the shaft is prevented the locking lever is maintained positioned to lock the latch bolt against retraction to unlatch the door. The elevator car is provided with a retiring cam Which is projected,'upon arrival of the car at a floor at which a stop is to be made, to operate the bell crank. Upon operation of the bell crank the end of its aforementioned arm is moved out of the path of'movement of the lug on the collar to permit movement of the shaft and consequently of the locking lever, thus unlocking the latch bolt. The latch bolt is operatively connected to the locking lever so that when the latch bolt of the door at the landing at which the car is positioned is retracted the extension of the locking lever is raised out of the recess in the member carried by the door and the shaft carrying the locking lever is turned. The shaftcarrying the locking lever is arranged to operate an interlocking switch to interrupt the control circuit of the elevator car to prevent operation of the car when the door is unlatched or in open position. When the door is opened the above mentioned member there on moves therewith about the centre line of the door hinges and supports the locking le ver in raised position. Thus the completion of the control circuit is prevented until the door is returned to fully closed position and latched.

In the drawings:

Figure 1 is a schematic view of a portion of an elevator installation embodying the in terlocking mechanism of the tlon.

Figure 2 is a front elevation of a hatchpres nt invenway door.

Figure 3 is a sectional view, partly broken away, taken along the line 33 of Fig-v ing of the control circuit.

V Figure 5 is a sectional View taken along he l1ne.66 of Figure 4 showing the locking lever seated in the recess of the member carried by the door.

Figure 7 a sectional view taken along the line 7-7 of Figure 6 illustrating a detail of construction.

Figure 8 is a sectional View similar to Figure 3, but showing the door unlatched and in open position and also showing the locking lever supported by the member carried by the door.

Figure 9 is a sectional View similar to Figure 6, but showing the locking lever positioned to permit opening of the door.

Figure 10 is a sectional view taken along the line 1010 ofFigure illustrating the construction 01" the latch and its operating mechanism.

Referring to Figures 1 to 3, the numeral 21 designates the wall of an elevator hatchway which is provided with an opening at each landing for receiving a door casing 22. A hatchwaydoor 23 for closing each opening is swingingly mounted in each casing on hinges 24. The numeral 25 designates a combined door closing and checking device of any suit able type for automatically moving the door to closed position and for cushioning the door a it approaches closed position.

it is customary with swinging type doors to provide a latching mechanism to maintain the door in closed position. In the embodi- -through door casing ment illustrated each of the doors is of metal and of hollow frame constructio--, and each door is formed with an opening in one edge for mounting the casing 26 of a latching mechanism within the door frame. Referring also to Figure 10, each latching mechanism comprises a latch bolt 27 guided in openings 28 and 30 in the end walls of casing 26 and arranged to be projected from the casing by a spring 31. Spring 31 is positioned between-a boss at one end of a slot 32 in latch bolt 27 and a stop 33 mounted on the wall of the casing and positioned within the slot. The latch bolt is projected from the easing into an opening in a keeper 34 mounted on door casing 22 to latch the door in closed-position, the movement of bolt 27 by spring 31 being limited by the engagement of one end of slot with stop 33. A member 35 is pivotally mounted on one wall of casing 26 and carries a pin 36 engaging one end of a slot 37 in the latch bolt. A member 38, journalled in the walls of casing 26 in any suitable manner, has a portion 40 engaging the pin 36 carried by member 35 and a tail piece 41 engaging a lu 42 on'member 35. A latch operating sha t 43 extends through casing 26 and through the sides of the hatchway door. Shaft'43 is operatively connected to member 38-so that when knobs 44 secured to shaft 43 on either side of the hatchway door are grasped and turned counterclockwise the portion 40 of member 38 engages pin 36 rocking member 35 counterclockwise to retract bolt 27 against the force of spring 31 from the opening in keeper 34. In the event that either door knob is turned clockwise the tailpiece 41 of member 38 acts on lug 42 on member 35 to turn the latter counterclockwise so that the pin 36 carried thereby effect-s retraction of latch bolt 27. The withdrawal of bolt 2? from keeper 34 is limited by the engagement of shoulders 45 on the latch bolt with the end wall of casing 26 adjacent opening 28.

Interlocking mechanism is provided for each hatchway door for locking the latching mechanism against operation to unlatch the door when the elevator car is not at the landing at which the door is located and to prevent the operation of the car when any door is unlatched or open. Only the interlocking mechanism for one hatchway door will be described in detail since the interlocking mechanisms for all the hatchway doors are of the same construction. Referring also to Figures 4, 6 and 9, a locking lever 47 is fixed to a shaft 48 extending 22 at the hinged side of'the door. Shaft 48 is journalled in a bearing 50 mounted on a support 51 within the door casing. The edge of the door is cut away on the hinged side to form an opening 46 through which a locking lever 47 adjacentopening 46 and has a substantially cylindrical portion 54projecting from the front of the door through opening 46. Member 53 is mounted so that the vertical axis of portion 54 thereof coincideswith the centre line of the hinges 24. A part of one side of cylindrical portion 54 is-cut away toif orm a recess 55 for receiving the extension 52 of lever 47. The underside of extension 52 I. is soshaped that when thelocking lever is raised the underside of the extension is parallel with the top of the cylindrical portion 54, as is shown in Figure 9. The base of recess 55 1S correspondingly shaped to form a seat '56 for extension 52 so that when lever 47 is in its lower position the top edge of extension 52 is preferably flush with the top of the cylindrical portion of member 53 and the underside of the extension rests in con tact with seat 56, as shown in Figures 4 and 6.

One arm 57 of a bell crank 58 rests in engagement with the underside of lever 47. Bell crank 58 is journalled on a stud 69 mounted on an interior wall of the door and the other arm 61 of the bell crank is piv otally connected to one end of a bar 62. Bar 62 extends across the batchway door 23 and is connected at its other end tothe end of latch bolt 27 which projects through opening 28 in latch casing 26. The arm 57 of bell crank 58 is adaptedto act on lever 47. when latch bolt 27 is withdrawn to unlatcll the door, to raise extension 52 out of recess 55 for unlocking the door.

Referring also to'Figure 5, a collar 63'is secured to shaft 48 within door casing 22. A spring 64- mounted between a bracket 65 on the wall 66 of door casing22 and an arm 67 projecting from collar 63 biases shaft 48 clockwise to engage the underside of locking lever 47 with arm 57 of bell crank 58 and to seat the extension 52 of lever 47 in the recess 55 in the cylindrical portion 54 of member 53.

A bell crank 70 is journalled upon a stud 71 carried by a bracket 72 mounted on the exterior wall of the hatchway side door of casing 22. Arm 73 of bell crank 70 projects into the interior of door casing. 22 through an opening inthewall 66 thereof. A spring 76 I mounted between a lug 77 onbracket 7 2 and the arm 73 of bell crank 70 maintains the end 74 of arm? 3 positioned in the path of movement of lug 75. A stop 78 on bracket 7 2 limits the movement of arm 73 by spring 76.

When the end 74 of arm 73is positioned in the path of movement of lug75, as above described, counterclockwise movement of shaft 48 is prevented, thus preventing movement of locking lever 47 on the other end of shaft 48 out-of recess55 and also preventing movement of arm 57 of bell crank 58, thus locking latch bolt 27 against retraction from latching position. The other arm 80 of bell crank 70 carries a roller 81 positioned in the hatchway to be engaged by aretiring cam 82 carried by the elevator car 83.

As shown in Figure 1, the elevator car is supported on a car sling 84. A bracket 87 extending from the cross head of the car sling supports a motor 88. The windings-of motor 88 are connected in an operating circuit of the control system.'. Motor88 upon operation reels in a cable 91 connected to retiring cam 82. Thus, when the operating circuit is completed and motor 88 is energized retiring cam 82 is withdrawn from the position in which :it engages the rollers 8lcarried by the arms of bell cranks '7 0. The circuits are arranged so that motor 88 is maintained energized until the arrival of the car '08 at a floor at which a stop is to be made. Motor 88 upon-'deenergizationpermits retiring cam 82 to be projected by'gravity into position for operating the bell crank 70 at that floor.

Referring to Figures 3, 4, 5 and 9 in particular. a lever 92 extending from collar 63, and offset from lug 75 for a purpose which will hereinafter become apparent, carries a support 93 of insulating material. A contact 94 mounted on support '93 is provided for bridging a pair of contacts 95 and 96. Contacts 95 and96 are mounted in and project rom casings 97, the casings being mounted on an insulating base supported on the wall of door casing 22. Contacts 95 and 96 are connected in a control circuit, such as a circuit for controllingv the starting of the elevator car, and are adapted to be bridged by contact 94 to permit completion of this circuit only when the hatchway door is locked in closed position.

Referring also to Figure 7, member 53 is also provided with a cam'98 arranged to engage lever 47 to raise extension 52 from recess 55 in member 53 as the door'is opened, in the event that extension has not been raised prior to opening of the door. As shown in Figure 4, the side recess 55 slopes from the top of cylindrical portion 54 toward seat 56 to provide a slight clearance between the side of the recess and the side of extension 52. The purpose of this clearance and the function of cam 98 will be more fully dethe interlocking mechanism for that door acts onarm 67 to'turn shaft 48 to seat the extension 52 of lever 47 in the recess 55 in the cylindrical portion 54 of member '53. Spring 64 also acts to maintain lever 47 in contact with-the arm57 of bell crank 58 which is operatively connected tothe bolt which latches the door in closedpositionQ Spring 64 also ried by shaft imaintainsxthe contact 94 carried by lever 92 by preventing counterclockwise movement of shaft 48. Consequently, locking lever 47 car- 48 is held against movement by bell crank 58. As bell crank 58 is connected tolatoh bolt 27 the knobs 44 cannot be turned for withdrawing the bolt 27 to unlatch the door. As shaft'48 is held against movement, contact 94 carried by arm 92 cannot be moved from bridging engagement with contacts 95 and 96 to open the control circuits. C

When the elevator car arrives at a landing at which a stop is to be made the retiring cam motor 88 becomes deenergized. As a result, retiring cam 82 moves by gravity downwardly and outwardly into the position in which it engages the roller 81 carried by the arm of the bell crank of the interlocking mechanism at that floor. Upon engagement of retiring cam 82 with roller 81, as shown in Figures 1, 8 and 9, bell crank 70 is turned against the force of spring 7 6. As bell crank 70 is operated by the retiring cam, the end 74 of arm 73 of the bell crank is moved upwardlyout of the path of movement of lug 75 on "collar 63 thus freeing shaft 48 for counter clockwise rotary movement. Latch bolt 27 thus unlocked to permit withdrawal of the bolt from keeper 34 to unlatch the door and to move extension 52 out of recess in the cylindrical portion of mem er 53. This po-- sition of arm 73 is illustrated in Figures 8 and 9.

When a knob 44 of the door at that floor is turned, latch bolt 27 is Withdrawn against the force of spring 31 from the opening in keeper 34, thus unlatching the door. As bolt 27 is withdrawn bell crank-58 is turned about stud so that arm 57 acts to raise lever 47 and turn shaft 48. As shaft48 is turned the lug 7 5 moves beneath arm 73 to the position illustrated in Figures 8 and 9. Arm 92, being offset from lug 75, is free to move without striking arm 73 of bell crank 70. As locking lever 47 is raised byarm 57 of bell crank 58, the extension 52 of the lever'is raised out of recess 55 in the cylindrical portion 54 of member 53 to the position in which the underside of the extension is parallel with the top of the cylindrical portion 54, as shown in Figure 9.

As shaft 48 is turned,lever 92 moves therewith to move bridging contact 94 out of engagement with contacts 95 and 96, thus opening the control circuit to prevent completion of a car starting circuit. In Figure 9 the door casing 22 has been broken away to illustrate this position of lever 92 and contact 94., The

arrangement is such that the control circuit is opened before the underside of extension 52 of locking lever 47 has been raised into parallelism with the top of the-cylindrical portion 54 of member 53 andbefore bolt 27 is retracted sufficiently to unlatch the door to permit opening movement thereof.

As the door has been unlatched, knob 44 may be employed as a grasp to open the door. As the door is opened the cylindrical portion 54 of member 53 moves with the door about the centre line of hinges 24 moving recess 55 from alinement with extension 52 of the locking lever. The top of cylindrical portion 54 moves beneath the extension 52 for supporting locking lever 47 in its raised position while the door is open and thereby maintains contact 94 out of bridging relationship with contacts 95 and 96 to prevent completion of a car starting circuit until the door is returned to closed position and relatched.

The end of latch bolt 27 rides over the face of keeper 34 in the initial part of the opening movement of the door to maintain bolt 27 retracted to keep arm 57 of bell crank 58 positioned to hold lever 47 in raised position until the door has been opened sufliciently to cause the cylindrical portion 54 to become firmly seated under the extension 52 of the locking lever. Thus, even in the event that turning movement is no longer applied to a knob 44 to maintain bolt 27 retracted after the door is unlatched, lever 47 is held in raised position by arm 57 of bell crank 58 until the cylindrical portion of member 53 becomes effective to support lever 47 in raised position while the door is unlatched and in open position. hen the end of bolt 27 rides off the face of keeper 34, spring 31 actsto move the bolt to projected position and arm 57 of bell crank 58 moves from engagement with lever 47. However, lever 47 is now supported in raised position since the extension 52 of lever 47 rests on the cylindrical portion 54 of member 53 as the latter turns about the center line of hinges 24 as the door is moved to open position. Since lever 47 is supported in raised position shaft 48 can not be turned counterclockwise, Figure 9, and therefore contact 94 is held out of bridging relation with contacts 95 and 96 to maintain the control circuit interrupted while the door is open.

In the event that latch bolt 27 on retraction is ineffective to raise lever 47, or in the event that the latch bolt is ineffective to latch the door and retraction of the bolt is consequently unnecessary to permit movement of the door, the application of force to open the door causes movement of the cylindrical portion 54 of member 53 against the extension 52 of the l ver. This might result in damage to the parts. However, if, under the above conditions, the door ismoved toward open positioncam 98 rides under and engages lever 47 raising the latter to move extension 52 out of the recess in member 54. As the side of recess 55 slopes from the top of member 54 toward the seat 56 a clearance is provided for permitting movement of member 54 toward the side of extension 52 as the extension is raised out of recess 55 by cam 98. Cam 98 acts to support lever 47 in raised position until the cylindrical portion of member 53 is firmly seated under extension 52 for holding the lever in raised positionas previously de-' scribed. t will be apparent from the foregoing'description that cam 98 is effective to raise lever 47 only when the elevator car is positioned at the floorat which the door is located and the end 74 of arm 73 is positioned out of the path of movement of lug to permit movement of shaft 48 and locking lever 47. It will also be seen from consideration of Figure 9 that, when latch bolt 27 on retraction acts through hell crank arm 57 to raise locking lever 47, cam 98 rides idly beneath the lever in the opening movement of the door.

When the door is released it is returned to closed position by the closing and checking mechanism 25. As the door is-closed member 53 turns with the door about thecenter line of hinges 24 to align recess 55 with the extension of locking lever 47, which is supported in raised position by the cylindrical portion of member 53. Arm 57 of bell crank 58- moves into position beneath lever 47 but is held out of engagement with the lever by spring 31 which maintains bolt 27 in projected position. As the door nears closed position-the end of latch bolt 27 engages the face of keeper 34. The engagement of the end of latch bolt 27 with the face of keeper 34 causes the bolt to be retracted against the force of spring 31 and movesthe arm 57 of hell crank 58 into engagement withlever 47 for maintaining lever 47 in raised position until the door is fully closed. lVhen the door reaches fully closed position recess 55 is alined with extension 52 of lever 47 and latch bolt 27 is projected by spring 31 into the opening in keeper 34 to latch the door. As bolt 27 is projected by spring 31,v the arm 57 of bell crank 58 moves downwardly permitting the spring 64 to act on arm 67 to turn shaft 48 for maintaining lever 47 in contact with the arm 57. Spring 64 alsoacts to seat the extension 52 of locking lever 47 in recess 55. As shaft 48 is turned lever 92 moves therewith to cause contact 94' to bridge contacts 95 and 96 to ena le completionof the starting circuit of the elevator car.

When the circuit for cam motor 88 is completed, this motor reels in cable 91, lifting the retiring cam 82 inwardly and upwardly out of engagement with roller 81 carried by arm of bell crank 70. Spring76 then acts on arm 73 to project roller 81 into position to be engaged by retiring cam 82 in a subsequent operation and to position the end 74 of arm 73 in the path of movement of lug 75 for preventing movement of shaft 48. As movement of shaft 48 is thus prevented lever 47 is locked in engagement with arm 57 of bell crank 58 preventing withdrawal of bolt 27 to unlatch the door.

It is to be noted that, in the absence of the car, the hatchway door at a landing cannot be unlatched inasmuch as the alignment of arm 73 with lug 75 prevents movement of locking lever 47 from cooperative relation with bell crank arm 57 which is-connected to the latch bolt.

It is also to be noted that the operation of bell crank 70 of one of the interlocking mechanisms by retiring cam 82, upon the arrival of the car at a floor at which a stop is to-be made, does not effect unlatching of the hatchway door but only removes the arm 73 from alinement with lug 75 to unlock the latch and permit unlatching of the door. The door remains latched in closed position until by a further operation the latch bolt is retracted.

When the door is unlatched contact 94 is moved out of bridging relation with contacts 95 and 96 before the door is fully unlatched and is maintained out of engaging relation so long as the door is unlatohed or open. Thus, the control circuits for the elevator car are maintained open to prevent operation of the car when a hatchway door is unlatched or open.

Furthermore, when the door has been opened and reclosed it becomes automatically latched in closed position and the control circuit for the car is automatically prepared by bridging of contacts 95 and 96 by contact 94 although the retiring cam remains in projected position until an operating control is operated to start the car. Since contacts 95 and 96 together with contact 94 and arm 92 of the interlocking mechanism associated with each hatchway door are mounted wholly within the door casings the switch mechanisms are inaccessible and cannot be tampered with even when the door is open. I

Although the interlocking mechanism has been described as applied to the hinged type of door it is also applicable to sliding doors. In case of sliding doors the lock member 53 may, for example, take the form of a bar extending across the door and provided with a slot or recess for receiving. the locking lever to lock the door.

-As many changes could be made in the above construction and many apparently widely difierent embodiments of this inven-- tion could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. Locking mechanism for a hinged hatchway door comprising; a rotary shaft mounted on the door casing at the hinged side of the door; latching means mounted at the other side of the door; means carried by the door for operating said latching means; a lever carried by said shaft; a member connected to said latching means and operable thereby to move said lever and thus effect rotary movement of said shaft upon operation ofsaid latching means by said operating means to unlatch said door; means for preventing such rotary movement of said shaft, thereby locking said latching means in latching position; and means for releasing said preventing means.

2. Locking mechanism for a hinged hatchway door comprising; a rotary shaft mounted on the door casing at the hinged side of the door; latching means mounted at the other side of the door; means carried by the door for operating said latching means; a lever carried by said shaft; a member connected to said latching means and operable thereby to move said lever and thus effect rotary movement of said shaft upon operation of said latching means by said operating means to unlatch said door; means for preventing such rotary movement of said shaft, thereby locking said latching means in latching position; means for releasing said preventing means to enable the operation of said latching means by said operating means; and a member carried by said door and movable therewith as said door is opened for maintaining said lever in the position into which it is moved by the member connected to said latching means.

In an elevator installation; a door casing; a door hinged to said casing, said door being provided with an opening at the h nged side thereof; a rotary shaft mounted on said door casing at the hinged side of said door, said shaft extending into the door casing; latching means mounted at the other side of said door; means carried by said door for operating said latching means; a lever fixed to said shaft and extending through said open ing into the interior of said door; a bell crank pivotally mounted Within said door, one arm of said bell crank being positioned beneath said lever; a link connecting the other arm of said bell crank to said latching means, said link being wholly Within said door; means carried by said door for operating said latching means to unlatch said door and for acting through said link and said bell crank to move said lever and thus efi'ect rotary movement of said shaft; a collar fixed to said shaft within said door casing; a lug on said collar; a bell crank mounted on saiddoor casing, one arm of said bell crank extending into the interior of said door casing and being biased into the path of movement of said lug for preventing such rotary movement of said shaft, thereby locking said latching means in latching position; and means for operating said second mentioned bell crank to move said arm thereof out of the path of movement of said lug, thereby unlocking said latching means.

l. Interlocking mechanism for a hatchway door; means at one side of the door for latching the door in closed position; means for locking said latching means in latching position; means for unlocking said latching means; manual 'means for operating said latching means, when unlocked, to unlatch said door; circuit controlling means; means operable by said latch operating means, during the unlatching of said door, for operating said circuit controlling means; and means at the side of the door opposite said latching means for preventing said circuit controlling means from returning to its initial, unoperated condition when the door is open and the latch operating means is released.

5. In an elevator installation; an elevator car; a hinged hatchway door; means at the side of the door opposite the door hinges for latching said door in closed position; means for locking said latching means in latching position; means controlled by said car for unlocking said latching means; means for operating said latching means, when unlocked, to unlatch said door; circuit controlling means; and means operable by said latch operating means, when said door is unlatched, for operating said circuit controlling means.

6. In an elevator installation; an elevator car; a hinged hatchway door; means at the side of the door opposite the door hinges for latching said door in closed position; means for locking said latching means in latching position; means controlled by said car for unlocking said latching means; means for operating said latching means, when unlocked, to unlatch said door; circuit controlling means; means operable by said latch operating means, when said door is unlatched, for operating said circuit controlling means; means for opening said door, when unlatched; and means carried by said door at i the hinged side thereof and movable therewith for maintaining said circuit controlling means operated when'said door is opened.

7 Interlocking mechanism for a hinged hatchway door comprising; means at the side of the door opposite the hinges for latching the door in closed position; means for locking said latching means in latching position; means for unlocking said latching means; means for operating said latching means, when unlocked, to unlatch said door; circuit controlling means mounted at the hinged side of the door; and means operable by said latch operating means, upon unlatching of said door, for operating said circuit controlling means.

8. Interlocking mechanism for a hinged hatchway door comprising; means at the side of the door opposite the hinges for latching the door in closed position; means for looking said latching means in latching position; means for unlocking said latching means; means for operating said latching means, when unlocked, to unlatch said door; circuit, controlling means mounted at the'hinged side of the door; means operable by said latch operating means, upon unlatching of said door, for operating said circuit controlling means; means for opening said door, when unlatched; and means mounted at the hinged side of said door and movable therewith to maintain said circuit controlling meansoperated when said door is opened.

9. In an elevator installation; a door casing; a door hinged to said casing; circuit controlling means within said door casing; a rotary shaft mounted on and extending into said door casing; meanswithin said door casing for connecting said circuit controlling means to said rotary shaft for operation thereby; a lever fixed to said shaft; a member mounted on said door at the hinged side thereof, said member having a portion provided with a recess for receiving said lever; and means operable to move said lever out of said recess and to thereby turn said rotary shaft to operate said circuit controlling means. i

10. In an elevator installation; a door casing; a door hinged to saidcasing; circuit controlling means within said door casing; a rotary shaft mounted on and extending into said door casing; means within said door casing for connecting said circuit controlling means to said rotary shaft for operation thereby; a lever fixed to, said shaft; a member mounted on said door at the hinged side thereof, said member having a portion provided with a recess for receiving said lever; means operable to move said lever out of said recess and to thereby turn said rotary shaft to operate said circuit controlling means; and means for opening said door, said portion of said member cooperating with said lever when said door is opened to maintain said circuit controlling means operated.

11. In an elevator installation; an elevator car; a landing served by said,car;a door casing at said landing; a hatchway door hinged to said casing; a switch mounted in said door casing; a rotary shaft mounted on and extending into said door casing; means within said door casing for connecting said switch to said shaft for operation thereby; a lever fixed to said shaft; a member mounted on said door at the hinged side thereof, said member having a portion provided with arecess for receiving said lever; means mounted at the other side of said door for latching said door in closed position; a bell crank pivotally mounted within said door, one arm of.

said bell crank being adapted to move said.

lever out of said recess for effecting rotary movement of said shaft, the other arm of said bell crank being connected to said latching means; a collar fixed to said shaft within saiddoor casing; a lug on said'collar; an, arm biased into alinement with said lug for pre venting such rotary movement of said shaft and thereby preventing. operation of said switchand acting through said lever and said bell crank to. lock said latching means in latching position; means, operable upon the arrival of said car-to stop at said landing, for moving; said arm out of alinement with said lug to free said shaft for such rotary movement and thereby unlock said latching means means for operating said latching means,

when unlocked, to unlatch said, door; said latching means, upon operation, acting through said'hell crank to raise said lever out of said recess and thereby effecting rotary movement of said shaft to operate said switch and means for opening said door, said port-ionof said member cooperating with saidlever, when said door is opened, to maintain said switch operated.

12. In an elevator installation; a hatchway; an elevator car therein; a landing served by said car; a door casing at said. landing; a hatchway door hinged to said,

casing; means for latching said door in closed position; a member carried by said door'at the-hinged side thereof, said member having a portion which projects from the landing side of said door and which is provided with. a recess; a rotary shaft mounted in.- said. door casing; a lockinglever fixed to said shaft, saidlocking lever having an extension projecting through said door for co-- operation. with. said portion of said member; means operatively connecting said latching means and said locking lever; a switch mounted in said door casing for controlling the operation of said car; operating means for said switch carried by said shaft; meansfor. causing rotary movement of said shaft.

to move said switch operating means to close said switch for permitting operation of said car and to seat the extension of said locking lever in the recess in said portion of said member when said door is in closed position, said locking lever when so positioned also acting through said connecting means to lock: said latching means against operation to unlatch said door; a collar secured to said shaft; a lug on said collar a bell crank pivotally mounted on the hatchway side of said door casing, one arm of said bell crank being adapted to be alined with said lug for preventing rotary movement of said shaft to crank to aline said one arnrwith said lug a-ndto project said roller carrying arm into said hatchway; a retiring cam carried by said car for engaging said roller to operate said bell crank upon arrival of said car at said landing, said bell crank, upon operation by said retiring cam, turning about its pivotal mounting to move said one arm out of alinement with said lug for permitting operation of said latching means to unlatch said door and rotary movement of said shaft to open said switch; means for unlatching said door, said means upon operation acting through said connecting means and said locking lever to move the extension of said locking lever out of recess in the cylindrical portion of said member and to thereby turn said rotary shaft to move said switch operating means to open said switch for preventing operation of said car, when said door is undatched; and means for opening said door,

the cylindrical portion of said member moving with said door about the center line of the hinges thereof, upon opening of said door, to move the recess therein out of alinement with the extension of said locking lever and to engage said locking lever to maintain it inraised position to prevent closing 01 said switch while said door is open.

7 13. In an elevator installation; an elevator car; a hinged hatchway door; means at the side of the door opposite the door hinges for latching said door in closed position;'means for locking said latching means in latching position; means controlled by said car for unlocking said latching means; means for operating said latching means, when unlocked, tounlatch said door; circuit controlling means means operable, prior to the un-' latching of said door, for operating saidcircuit controlling means; and means carried by said door at the hinged side thereof and movable therewith for maintaining said circuit controlling means operated when said door is opened,

14. Interlocking mechanism for a hinged hatchway door comprising; means at the side of the door opposite the hinges for latching the door in closed position; means for locking said latching means in latching position; means for unlocking said latching means; means for operating said latching means, when unlocked,to unlatch said door; circuit controlling means mounted at the hinged side of the door; means operable prior to the opening of said door, for operating said circuit controlling means; and means mounted at the hinged side of said door and movable therewith to maintain said circuit controlling means operated while said door is open.

15. In an elevator installation; a door casing,a hatchway door hinge-d to said casing,

means at the side of the door opposite the door hinges for latching said door in closed osition' means for lockin said latchin I b o means in latching position; means for unlocking said latching means, said unlocking means including alever pivotally supported upon the door casing at the side upon which the door is hinged and having an arm extending into the shaftway, and also including a retractable cam on the elevator car which engages said lever arm when the elevator car stops opposite said hatchway door; circuit closing means mounted on said door casing at the side upon which the door is hinged; and means, also mounted on said door casing at the side upon which the door is hinged, and dependent upon the operation of said lever, for controlling the operation of said circuit closing means. i

16. In an elevator installation; a door casing; a hatchway door hinged to said casing; means at the side of the door opposite the door hinges for latching said door in closed position; door mechanism, mounted upon said door and having an element thereof adjacent the hinged side of said door, connected to said latching means so that the operation of said latching means to unlatch the door causes movement of said element; means for locking said latching means in latching position, said locking means being mounted on the side of the door casing upon which said door is hinged, and being effective to cooperate with said movable element of said door mechanism to prevent said movement of said element which accompanies the unlatching of the door, thereby locking said latching means in latching position; means including a car cam for unlocking said latching means; interlock contact mechanism for the elevator operating circuits mounted in said door casing on the side thereof upon which said door is hinged; means for operating said interlock contact mechanism to open-circuiting position prior to the opening of said hatchway door; and means at the hinged side of said door for preventing said interlock contact mechanism from returning to its initial, closed circuit position while said hatchway door is open.

17. In an elevator installation ;'a door casing; a hatchway door hinged to said casing; means at the side of the door opposite the door hinges for latching said door in closed position; door mechanism, mounted in said door and having an element thereof adjacent the hinged side or" said door, connected to said latching means so that the operation of said latching means to unlatch the door causes movement of said element; means for locking said latching means in latching position, said locking means being mounted on the side of the door casing upon which said door is hinged, and being effective to cooperate with said movable element of said door mechanism to prevent said movement or said element which accompanies the unlatching of the door, th reby locking said latching means in latching position; means for unlocking said latching means, said unlocking means including a lever pivotally supported upon the door casing at the side upon which the door is hinged, and having an arm extending into the shaftway, and said unlocking means, when operated, rendering said lockingmeans ineffective; a retractable cam carried by the elevator car which, upon the stopping of the car opposite said hatchway door, engages with said lever arm, thereby to operate said unlocking means; interlock contact mechanism for the elevator operating circuits mounted in said door casing on the side thereof upon which said door is hinged, and arranged to be accessible only from the hatchway means for operating said interlock contact mechanism to open-circuiting position after said elevator car has stopped opposite said hatchway door r and prior to the opening thereof; and means for maintaining said interlock contact mecha,

nism in open-circuiting position while said hatchway door 1s open, said maintaining means including a cam carried by said door 7 adjacent the hinged side thereof, and an arm,

connected to said means for operating the interlock contact mechanism, engaging said cam while said door is open, a

In testimony whereof, I name to this specification.

EDWARD LEE DUNN.

have signed my

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