US404015A - Electrical switch for elevators - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1. W. E. NIGKERSON.

ELECTRICAL SWITCH FOR ELEVATORS.

No. 404,015. Patented May 28, 1889.

WlTN EEEES (No Model.) 2 Sheets-Sheet 2.

W. E. NIGKERSON.

ELECTRICAL SWITCH FOR ELEVATORS.

No. 404,015. Patented May 28, 1889.

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\VILLIAM E. NICKERSON, OF CAMBRIDGE, MASSACHUSETTS.

ELECTRICAL SWITCH FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 404,015, dated May 28, 1889. Application filed February 28, 1889. Serial No. 301,505. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM EMERY NICK- ERSON, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Electrical Switches for Elevators, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention consists in combining with a hand-switch mechanism within the carriage of an elevator, electrically connected with the electrical devices by which the hoisting mechanism is controlled, fixed cam pieces outside and independent of the elevator-carriage, arranged to operate the circuit-breaking devices within the car automatically, and thus cause the carriage to stop at the various landings when. desired.

An application of my invention is shown in the accompanying drawings, in which- Figure l is a view in elevation, showing sufficient portions of an elevator to enable one to understand the location and general arrangement of the parts that constitute my device. Fig. 2 shows the interior of the switch-box in elevation. Fig. 3 is a vertical section of the switch-box taken on the line a: [c of Fig. 2, and Fig. 4; is a vertical section of the switch-box taken 011 the line yyof Fig. 2.

In the drawings, A, Fig. 1, represents the elevator-well, Bt-he carriage, and C the hoisting-rope. Within the carriage B, I place a switclrbox, D, which is connected to the various wires of the electric system.

E is a wire passing from the switch-box D through the tube M to the battery E. Thence the circuit passes to the device E, and returns to the switch-box through the wire H.

K is awire leading from the switch-box D through the tube M to the motor I1, thence by the wire H" to the battery 11?, the circuit being completed by the wires II III to the switch-box D.

P 1, Fig. 1, represent campieces fixed to the well-room wall, which are so arranged that the elevator-carriage in its passage will cause the pin N to come in contact with either of them. Then the said pin N will be pushed inward and make a break in the circuit, the effect of which will be explained be low.

My switch-box construction is shown in Figs. 1, 2, and i and its interior devices are as follows: The wire or electrode His connected by branches 71. 71. to the contact springplates N and L. The wire E passes to the switch-post E, and the wire K to the switchpost K. (See Fig. 2.) The contact-point N is connected to the switch S at S by the wire N, and the contact-point L is connected to the switch S at S by the wire L. The contact springplate L is provided with a pushbutton, L, Fig. 4, its resilience tending to keep it out of contact with the point L -that is, to keep the circuit open. On the contrary, the resilience of the contact spring-plate N tends to keep it in contactwith the contactpoint N only to be broken when the pin N is forced inward by coming in contact with one of the cam-pieces 1 (See Figs. 1 and The switch S is pivoted at S, Fig. 2, and can be turned to the right or left, as indicated by dotted lines, Fig. 2. 'When the switch S is vertical, both circuits are open.

In my device one of the devicesE", for instanceis intended for the purpose of operating that part of the controlling mechanism of the hoistingunachine that causes the elevator-carriage to ascend, while the other acts upon the device for allowing the carriage to descend.

The operation of my invention is as follows: If it is desired to cause the elevator-carriage to go up, the switch S is turned to the left, so that the post E is connected through the switch and the wire N, Fig. 2, to the contact N Thence the circuit is made through the spring contact-plate N, wires H H, device E wire E battery E, wire E to post E and the circuit is complete, and will remain so until the carriage in its ascent causes the pin N to come in contact with the cam piece P, at which. point it will be pushed inward and force the plate N from the contact-point N thus break ing the circuit and causing the carriage to stop. To cause the carriage to again start up ward, the switch S is left in its place and the plate L is forced by the push-button L, Fig. 4, down onto the contact-point L This action substitutes a bridge (consisting of the wire L contact-point L plate L, and wire h) for the portion cut out via, the wire N3,0O11- tact-point N plate N, wire h and re-estalr lishes the circuit through the device E If the attendant holds the push-button L down, the elevator-carriage will continue to ascend, irrespective of the action of the campieces P and pin N. 1

To cause the carriage to descend, the switch S is turned to the right and a circuit is established through the device H as follows: Starting from the battery H the circuit passes through the wires H II h, plate N, contactpoint N wire N to switch S; thence to switchpost K, wire K, device H and wire H to battery H Now the circuit is complete and will remain so until the elevator-carriage in its descent causes the pin N to come in contact with one of the cam-pieces P, in which event the pin N will push the contact-plate N away from the contact-point N and thus break the circuit and stop the elevator-carriage.

To restore the circuit, the attendant has only to force the push-button L inward and a bridge will be made; as has already been'set forth. To allow for the effect of the lateral movement of the carriage, due to looseness of fit in its ways on the action of the cams P, I so construct them that they will not press with a positive effect on the pin N, but with a pressure that will not force the pin so hard as to cause any injury or beyond a certain fixed distance-that is, after the pin N has been pressed in sufliciently to cause a separation 1. In an electric device for controlling the motion of an elevator-carriage, the combination of a series of cam-pieces on the walls of the elevator-well disposed with reference to the various landings and adapted to act upon a circuit-breaking device within the carriage and cause the carriage to automatically stop at said landings and so remain until the circuit has been manually reestablished, with electrical circuits having terminals Within the carriage connected to said circuit-breaking device, and an electric device adapted to actuate the controlling mechanism of the hoisting-engine, substantially as and for the purpose set forth.

2. In an electric device for controlling the motion of an elevator-carriage, the combination of the cams P P and a circuit-breaking device, as described, with an electric bridge adapted to re-establish the electric circuit at the option of the attendant when said circuit has been automatically broken at a landing by a fixed cam piece, substantially as described, and for the purpose set forth.

3. In an electric device for controlling the motion of an elevator-carriage, the combination of the switch S, posts E K, contact-points N L contact-plates N L, and the several connecting and circuit wires, with an electric device, substantially as and for the purpose set forth. Y

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 26th day of February, A. D. 1889.

WVILLIAM E. NIOKERSON.

VVitnesses FRANK G. PARKER, MA THEW M. BLUNT.

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