US1703724A - Electric control switch - Google Patents

Description

Feb. 26, 1929. 1,703,724

C. C. CRISPEN ELECTRIC CONTROL SWITCH Original Fil e d May 7, 1924 2 Sheets-Sheet 1 7* I. filly-gm if; ,0

WITNESSES 6 74 I5 A TTORNE YS Feb. 26, 1929. 1,703,72

c. c. CRI SPEN ELECTRIC CONTROL SWITCH Original Filed .Ilay '7, 1924 2 Sheets-Sheet 2 P WI TNESSE IN VEN TOR g 1 C. C. (life/25A;

I B Y W/L A TTOR NEYS Patented Feb. 26, 1929.

CLARENCE GUI-LEN CBISPEN, OF UBG, PENNSYLVANIA.

ELECTRIC CONTROL SWITCH.

Application fled Kay 7, 1984, Serial My invention is an improvement in electric control switches, and it consists in the combinations, constructions and arrangements herein described-and claimed.

An object of the invention is to provide a simple, reliable and conveniently operable switch for controlling two circuits, so that one of said circuits can be opened or closed as desired, and the other of saidcircuits simultaneously closed or opened.

A further object of the invention is to provide a switch of the character described which normally remains in position to open the circuits which it controls.

A still further object of the invention is to provide a switch of the character described which is'adapted when secured at the--upper end of a vertically disposed'handle, to be conveniently operated by the thumb of a hand which grasps the handle.

Other objects and advantages will be apparent from the foregoing description, con-- sidered in conjunction with the accompanying drawings in which:

Figure 1 is a front'view of a switch emhodying the invention in association with a vertically disposed handle and showing the hand of an operator grasping the handle and in position to'operate the switch,

Figure 2 is a longitudinal central section through the switch, the view bein taken substantially along the line 22 of Figure 1,

Figure 3 is a transverse central section through the switch, the view bein taken sub" stantially along the line 3-3 of i re 1,

Figure 4 is a front elevation of t e switch with the cover thereof omitted and showing a fragmentary portion of the associated han- Figure 5 is a diagrammatic view showing the switch and two sets of circuits controlled thereby, the switch being shown in position to close the circuits of one set and to open the circuits of the other set,

Figure 6 is a view similar to Figure 5, showing the switch in position to open the circuits of the first set and in position to close the circuits of the other set,

' Figure 7 is a pers ective group view of the elements of a modi ed form of switch sep'a rated from one another,

Figure 8 is a front view of the modified form of switch with the cover thereof omitted, and I Figure 9 is a diagrammatic view of the modified switch and of two circuits which it the open end of the body In. 111,020. Renewed July :1; 1m.

controls; showing the switch in normal or neutral position and both circuits open.

Aswitch embodyin the invention is particularly well adapte for use to control the direction of flow of an electric current through the field winding of a reversible motor, for propelling 'an elevator to effect reversal in the direction of movementof the elevator, as will be understood from the following description.

The preferred form of switch com rises acasing made (if any suitable known dielectric material and consisting of a box-like. body 1 and a cover 2 therefor, as best seen in Figures 2 and 3. The body 1 is provided at its closed end or bottom with laterally extendattaching ears 3 which are apertured at indicated at 5.

The switch bar 8 is of greater length than the switch casing and,extends at its opposite ends beyond the planes of the op osite ends of the body 1'. a The extending en portions of the switch bar are indicated at 8 and 8", respectively, and preferabl are circular in cross sectional contour whi e the remaining portion of the switch bar has a flat lower face adapted to slide in the guideway 7 across One end wall of the ody 1 has a pair of spaced stationary contacts 10 which extend inwardly therefrom adjacent to the open end of the body- The contacts 10 lie in the same horizontal plane. A pair of spaced stationary contacts 11 extend inwardly from the other'end member of the body 1 and lie in the same horizontal plane as the contacts 10. A pair of movable contacts 12 are carried at the upper ends of adjacent spring The slidable switch bar 8 carries a presser block 18 which is made of a dielectric mate rial and preferably is removably and pivotally attached to the intermediate portion of the switch bar by a bolt 19 which extends through a bore in the presser block and through a transverse vertical opening in the switch bar to' terminate at its upper end in a counterbore 20 in the upper side of the switch bar, a nut 21 being screwed on the upper end portion of the bolt to prevent displacement of the latter. If desired, a washer 22 may be placed on the bolt 19 between the block 18 and the head of the bolt.

The brackets 14L are made of electrical conducting material. The presser block 18 de pends from the switch bar 8 between the outer ends of the arms 13 and 16 of the brackets let and tends to spread the outer ends of the arms slightly apart, whereby the switch bar will normally be held in neutral or inactive position as shown in Figure 2, as a result of the spring action of the arms. When the switch bar 8 is in the position shown in Figure 2, the movable contacts 12 will be spaced from the contacts 10 and the movable contacts 17 will be similarly spaced from the contacts 11 and the end portions 8- and 8 of the switch bar will protrude equal distances from'opposite ends of the guideway 7.

From the foregoing description of the various parts of the device, the operation thereof maybe readily understood. The switch is partlcularly well adapted for use as an elevator control switch and may be connected by suitable electrical connections with an e ectric motor for propelling the elevator so that the rotor of the motor will be rotated in one dlrectlon and the'elevator raised when the switch bar is moved axially, as a result of pressure on one of the ends 8 or ,8". and the rotor of the motor will rotate in the opposite direction and the elevator will be lowered when the switch bar is moved axially in the o posite direction in the guideway, it being 0 vious that axial movement of the switch bar in one direction from the position shown in Figure 2, will cause the resser block 18 to force the contacts 12 against the contacts 10 while axial movement of the switch bar 8 1n the opposite direction from the position shown in Figure 2 will cause the contacts 17 to be moved against the contacts 11. The switch bar will be returned to the position illustrated in Figure 2, as soon as pressure has been removed from either end of the bar 8 because of the balanced spring action of the bracket arms 13 and 16.

As shown diagrammatically in Figures 5 and 6, one of the spring brackets 14 may be connected by a conductor 23 to a suitable source of electric current supply, such as the battery 24. The other bracket 14 is connected by a return conductor 25 to ground. One of the contacts 11 is connected by a conductor to one side'of the field winding 27 of a of any suitable known type of construction and are adapted to break the motor operating circuits in which they are disposed. When the elevator is at its extreme limits of travel in opposite directions, the switch 30 being adapted to function to limit the movement of the elevator in one direction and the switch 31 to limit the movement of the elevator in the opposite direction. The ends 8 and 8 of the switch bar serve as push buttons. When the end 8 has been pressed inward until the contacts 17 are in contactwith the contacts 11, the motor operating circuit will be as indicated by the arrows in Figure 5. When the end 8 has been pressed lnward from normal position, the motor operating circuit is as indicated by the arrows in Figure 6 and current will flow through the field coil of the elevator motor 27 in the direction opposite to the direction of flow of current through the same field coil in Figure 5.

A vertically disposed handle/35 may be attached to the support5 directly beneath the switch easing 1'2, so that the handle 35 is described form of switch in essential respects and differs from the latter in that only one bracket indicated at 14 is comprised thereinfi The respective arms 13 and 16 of the one bracket 14' carry contacts 12 and 17 for cooperating with stationary contacts 10 and 11 respectively. Only one stationarycontact 10' and one stationary contact 11 are provided in the form of the device exhibited in Figures 7 and 8. An electrical conductor 36 is connected with the contact 10 and may lead to the winding of a reversible motor for operating an elevator. A conductor 37 is connected with the. stationary contact 11 and may lead to the winding of the motor. The latter may be connected with the bracket 14 by a conductor 38 which is attached to the latter. The direction of rotation of the motor thus could be reversed through the use of the modified form of the switch. Obviously my invention is susceptible of embodiment in forms other than those exhibited in the accompanying drawings, and I therefore consider as my own, all modifications and adaptations thereof that fairly fall within the scope of the appended claim.

I claim An electric switch comprising a casing made of dielectric material and having a transverse guideway in its upper part, a pair of spaced stationary contacts respectively disposed in said casing below said guideway, a substantially U-shap'ed electrical conducting spring member having the web portion thereof secured to the bottom of the casing so that the arms of the spring member will be upstanding in the casing between said stationary contacts and each in adjacent spaced relation to the corresponding stationary con-- tact, contacts on the arms of said spring member each movable with its supporting arm to and from position to engage the adjacent stationary contact, a switch bar slidable in the guideway and havin the ends thereof protrudin from the en s of the guidway, and a dielectric block depending from said switch bar between the arms of said spring member and movable with the switch bar to move the movable contacts selectively against the adjacent stationary contacts, the arms of said spring member acting to moye the movable contacts away from the stationary contacts and to return the switch bar and block to neutral positions when pressure has been removed from said switch bar.

CLARENCE CULLEN CRISPEN.

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