US1145908A - Door-motor. - Google Patents

Description

'Patented-July 13, 1915.

2 SHEETS-SHEET J. F. VICELROY, DECD.

s. H. McELRoY. ExEcuTRlx.

DOOR MOTOR. APPLICATION r|LEo1uN1.19||.

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l. F. MCELROY, DECD.

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DOOR MOTOR.

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Patented July 13, 1915.

2 SHEETS-SHEET 2 es arten rrr.

JAMES F. MQIELRY, 0F ALBANY, NEW YORK; SUSIE HALE MCELROY, EXECUTRIX 0F SAU) JAMES l5". MCEOY, DECEASED, ASSIGNOR TO CONSOLIDATED CAR-HEATING CMPAY, A. GRPORATXGN GF WEST VIRGINIA.

BOOR-MOTOR.

Application flied June l, 1911.

To all whom it may concern:

lBe it known that l, JAMES F. MCELROY, a citizen of the United States, residing at Albany, county of Albany, State of New York, have invented certain new and useful lmprovements in Door-Motors, the following being a full, clear, and exact disclosure of the one form of my invention which l at present deem preferable.

-F or a detailed description of the present form of my invention, reference may be had to the following specification and to the accompanying drawings, which illustrate my invention. l

Figure 1 is a plan view and Fig. 2 a side elevation of my improved door motor; Fig. 3 is a plan of the same, together with the piping, and Fig. i is a side elevation of Fig. 3..

My present invention involves certain improvements in door motors based upon and constituting a development of my tour-cylinder form of motor and relates particularly to the mode of supporting such a motor and relating it to a car door to be operated thereby.

rllurning to Fig. l, A1 and A2 are two open-ended cylinders, facing each other but upon different levels, as more clearly appears in Fig. 2. B2 and B2 are similar cylinders arrangedjparallel to and at one side of the cylinders Alf and A2 respectively. rThe latter are power cylinders, while B1 and"B2 are cushioning or dash-pot cylinders, corre,- sponding respectively to` A1 and A2. A cross-headD, connected to the piston rods at' and b2 of the respective cylinders A1 and B2, travels on the set of cylinders A2 and B2, while a similar cross-head D2, connected to the piston rods a2, travels on the cylinders- A1 and B2. The two cross-heads Dl and D2 are connected by a rod C,`so that the four piston rods and the two cross-heads all move together. rll`he cylinder B1 acts as a cushioning cylinder or dash-pot for the power cylinder A1, and, similarly, the cylinder B2 serves as a cushioning cylinder or dash-pot for the power cylinder A2. rl`h'us if air is admitted to the right-hand closed end of the cylinder A1 through the pipe l, its piston rod a1 will be forced to the left and at the same time the piston in cylinder Bl will also move from the right-hand, open closed end of that cylinder toward the letthand end and tend Specification of Letters Patent.

Patented duly t3, with.

serial No. 630,680.

to compress the air therein, which escapes, however, through a restricted outlet. Conversely, if the air is admitted to the lefthand Vclosed end of cylinder A2 by the pipe 3, its piston rod a2 will move to the right and the piston of B2 will similarly move to the right and provide the cushioning or damping eflect upon the action of the cylinder A2. 0n the cross-head D1 are two ears d d which, as appears in Figs. 3 and 4l, are connected to a movable element R through link d1 and the otl'set link R4. The above-mentioned cylinders are supported as clearly appears in Fig. 2. 'lhe standard S2 at the left supports the left-hand ends of cylinders A2 B1 and also carries the lock hereinafter described. rlhe central standard S2 carries the inner free ders, which are preferably oi. brass, are notV screw threaded at the point where they enter the head of the standard S2, but are merely inserted in openings in the standard and are secured therein by screws 81 s2. These screws s1 s2 pass through the wall of the standard S2 and the cylinders, so that after the cylinders are inserted in the standard andthe screws are in place they cannot be withdrawn. By merely removing the screws, however, the cylinders are left free to be withdrawn from their position in the standard. Since the end standards S1 and S2 are separate from the central one S2, these end standards, together with the cylinders se cured thereto, can thus be easily drawn away from the central Standard. The open ends of the several cylinders are flared or beveled, as clearly appears in dotted lines in Figs. l and 2. The piston rods are connected to their respective cross-heads D1 and D2 by means of sockets formed in the cross-heads, into which sockets the rods enter and abut against the bottoms thereof. Cotter pins Z2 are then passed through the rods and through the projecting flanges around the edges of the sockets. These cotter pins are not essential, since the pressure of the pistons acts in every case to push the piston rod into its socket` but they are present as a matter of precaution. This arrangement etl renders it very easy to remove a piston and piston rod, since it only involves the withdrawing of the cotter pin-and the moving aside of the cross-head, assuming that the cross-head is iirst disconnected from the rod C, which joins the two cross-heads together' and is connected thereto in a similar way.

In these figures G represents an air reservoir from which the air passes by pipe 2, Iirst through a strainer g1, then through a stop cock y to the inlet side of the controlling valve F, which it is not necessary to describe in detail, it being well understood that such a valve will act to admit the air to either the c vlinder A1 by means of the pipe l, or to the cylinder A2 by means of the pipe 3. 'ln the former case it will also connect the pipe 3 to the exhaust, while in the latter case it will also connect pipe l to the exhaust,`so that when air is admitted to the working end of one cylinder the working end ot' the opposite cylinder is connected to the exhaust. The exhaust pipe is shown at As stated above` the motor operates the movable element R here shown as a door (see Figs. 3 and 4) by links Z1 and R4 and the door slides just inside the wall V of the car, being guided by the friction rollers 'r-r and arrested by the stop column V1. My motor being of a long, narrow form can be placed under the car seat at one side of the route of travel of the door and its stroke can be equal in length to the travel of the door from open to closed position. Hence the cross-head D1 can be connected directly to the door by links all, R4 which renders the installation extremely simple and compact,

without the complication of devices for multiplying the range of stroke of the motor to give an adequate range of travel of the door. The small diameter 0f cylinder will give the force required to move the door and also will occupy but little space transversely ot' the car. The advantage of this is that the motor has a uniform leverage connection with the door at all points of the travel of the door, whereas the interposition of levers between the piston and door gives the piston a greater leverage as the door'approaches its closing position so that an arm, hand or leg caught in the door at that time may be crushed by the great force which the piston can exert through the leverage it has at that point. By applying the piston directly to the door, as in my arrangement, it becomes easy to adjust its force, so that it can close the door without having sufficient power to crush or injure a person who may be caught between the door and the jamb. Such adjusted force becomes also no greater at the door when the door is at either end of its route than at the middle. My arrangement is one producing such a uniform mechanical advantage of the motor upon the door, each motor cylinder, for this purpose, being given a stroke substantially equal to the length of the route traversed by the door and both cylinders being placed as nearly aspossible in line with each other, the door-opening cylinder along and beside the route traveled over by the door in opening, and the doorclosing cylinder beyond the said route but in the Same general line therewith. Moreover, the piston rod o1 the door-closing cylinder overlaps and is guided b v the door-opening cvlinder` the thrust and buckling strain on the long rod of the remote door-closing cylinder being thereby taken up, and only the short door link fl interposed between the door and the point of push or thrust on the motor which is the cross-head D1. Likewise the door-opening cylinder has its closed end placed toward the door or adjacent to its rear edge and the thrust on its long piston rod, which overlaps and is guided by the door-closing cylinder, is transmitted back by the rod C to the cross-head Dl which is the point on the motor whence force is applied to the door through the short link d. In both cases the arrangement of the motor with respect to the door is such that only a short and direct connection between them is required, although the motor stroke is very long and the thrust-strain on the piston rods would otherwise tend to buckle them. Also the end of each piston rod is guided externally of the cylinder although the motor is applied to the lower part of the door where no piston guide extending across the closed position of the door or along the route of travel of its forward edge would be permissible.

What I claim as new and desire to secure by Letters Patent is:

1. The combination with a movable element, of a motor cylinder, said cylinder being located along the route traveled by the movable element and having a stroke substantially equal to the travel of the movable element, a piston' movable in said cylinder and provided with a piston rod, a guide eX- ternal of the cylinder and movable thereon, said guide being connected to said piston rod, and a direct connection between said piston rod and the movable element.

2. The combination with a movable element, of a motor cylinder, said cylinder being located to one side of the route traveled by the movable element and having a stroke substantially equal to the travel of the movable element whereby the movable element and cylinder overlap at one extremity of the travel of said piston, a iston movable in said-cylinder and provi ed with a piston rod,r an external cross head guided by said cylinder and connected to said piston rod, and a direct connection between said crosshead and said movable element.

3. The combination with a movable element, of a motor cylinder, said cylinder belli aaaaaoe ing located along the route traveled by the movable element and having a stroke substantially equal to the travel of the movable element, the closed end of said cylinder being located adjacent the rear edge of said movable element when the latter is in closed position, a piston movable in said cylinder and provided with a lpiston rod, a piston guide extending beyond said cylinder, a cross-head guided by said cylinder and connected with said piston rod, and a direct connection between said cross head and said movable element. 4

4. 'llhe combinatin with a movable element, of a motor cylinder having a stroke substantially equal to the travel of said movable element and located to one side of the route traveled bv the rear edge of the latter with its closed end adjacent to said edge, a second cylinder extending beyond the one first named, a cross-head guided bythe rst cylinder and traveling the length of the same, and a connection between said crosshead and the respective pistons of both cylinders.

5. rl`he combination with a movable element, of a cylinder for moving the same in one direction and having a stroke substantially equal to the travel ot the rear edge ot the said movable element and located to one side of the route of ttavel ol the said rear edge, a cylinder tor moving said movable element in the opposite direction and located between the first mentioned cylinder and the movable element but odset with respect thereto, an external cross-head guided by one of said cylinders, a connection between said cross-head and movable element, and a connection between said cross-head and the respective pistons of both cylinders.

6.' 'lhe combination with a movable element,.ot cylinders tor shiftin the same in opposite direction and locate in succession to one side of the route of the movable element in one of its'extreme positions but odset with respect to each other, a piston and piston rod for each cylinder, a traveling cross-head guided by one cylinder, a connec tion trom said cross head-to the movable element, a traveling cross-*head guided by the other cylinder, a connectionl between said cross head, a rod connecting the rst mentioned cross head with the piston of the last mentioned cylinder, and a rod connecting the last mentioned cross-head with the piston of the other cylinder.

7. An apparatus ot the character described comprising a reciprocating element to be operated, two power cylinders in tacing relation but in did'erent planes one ot which cylinders overlaps the line of travel of the said element, pistons and piston rods for the respective cylinders, and odset connecting means for operating the said reciprocating element. y

8. An apparatus of the character described comprising a reciprocating element to be operated, two power cylinders in tacing relation but in diderent planes one et which overlaps the line ot travel of said element, pistons and piston rods for the respective cylinders having a range ot travel equal to the range ot travel ot said element, and

odset connecting means for operating the said element.

lin witness whereof ll have hereunto set my hand, before two subscribing witnesses,.

this 29th dav of ll/lay, 1911.

JAMES l?. MGELRUY. Witnesses:

HERBERT A. Calas, @mannen Pannen.

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