US236137A - Automatic elevator-gate - Google Patents

Description

(No Model.) 4 I G. AOKBRMA-NN, Automatic Elevator Gate.

No. 236,137. Patented Jan. 4, 1881;,

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GEORGE AOKERMANN, OF CINCINNATI, OHIO.

AUTOMATIC ELEVATOR-GATE.

SPECIFICATION forming part of Letters Patent No. 236,137, dated January 4, 1881.

Application filed August 2, 1880.

To all whom it may concern:

a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Automatic Elevator- Gates, of which the following is a specification;

My invention relates to that class of self opening and closing elevator-gates which move up and down in vertical grooves in front of the hatchway and are operated by the upward-and-downward motion of the cage or platform of the elevator; and it has for its 01)- I 5 ject the construction and arrangement of the mechanism which transmits the motion from the elevator-platform to the vertically-guided gate in such a manner as to insure greater certainty in the operation of the device, and with less probability of accidental derangement while in use.

-My invention consists in securing upon one side of the elevator-platform to the post a toothed rack, which engages'at certain times, to be hereinafter explained, with a spur-wheel of peculiar construction, revolving upon a stud securely attached to substantial frame-work,

placed upon the floor, through which the elevator passes. The spur-wheel is provided with a wrist or crank pin, which carries one end of an ordinary pitman, the other end of the pitman being pivoted to the end of a reciprocating rack, which in turn gives motion to the pinion, sheave, and ropes for lifting the gate.

1n the accompanying drawings, Figure l is a perspective view of an elevator containing my invention, and Fig. 2 is a detached view of the principal elements of my device.

Similar letters of reference indicate similar parts. 7

A is the platform or cage of an elevator, with the customary upright posts B B, crossbeam B, and lifting-rope B, operated. by any convenient form of hoisting engiue or lifting-gear. O is the gate, which slides in vertical grooves or ways, the position of which is indicated by the dotted vertical lines.

E E are the winding-spools, around which the ropes D D, which lift the gate 0, are coiled.

F- is the grooved sheave, carrying the rope (No model.)

G, the upper end of the rope being coiled on the end of one of the spools E, and the other end,G, being passed over the guide-pulley g and attached to the weight g. The weight 9 acts so as to counterpoise the gate 0 in the manner shown in the drawings.

To the end of the shaft upon which the sheave F is mounted is keyed a spur-piniomf, which engages with the reciprocating rack H, traveling in horizontal ways or guides I.

J is a-spur-wheel revolving upon an ordinary stud, and provided with a wrist or crank pin, 7.

'K is a short pitman, and L a toothed. rack, firmly secured to the post B of the platform A.

The distinguishing feature of the spur-wheel J is that it contains one tooth which is made longer or deeper, measured on a radial line, than the remaining teeth of the wheel. This tooth is placed on the periphery of the spurwheel diametrically opposite the wrist-pinj.

The travel of the rack H inward or toward the platform A elevates the gate 0 through the pinion f, sheave F, rope G, spools E E, and ropes D D, as clearly shown in Fig. 1 of the drawings, and the travel of the rack H outward or away from the platform A permits the gate 0 to descend by reason of its own gravity, or so much of its own gravity as is not counterbalanced by the weight g acting through the rope G G.

The normal position of the gate being when it is down or closed, and the rack L, spur-wheel J, pitman K, and reciprocating rack H in the position shown in Fig. 2, it will be observed that the long tooth of the spur-wheel is in position to receive the first impact of the rack L as it approaches the spur-wheel, either from below, as shown in Fig. 2, or as it approaches it from above.

The revolution of the spur-wheel J is accompanied by a corresponding revolution of the wrist or crank pinj, and produces a double travel of the rack H across the face of the pinion f, thereby rotating the sheave F, first in the direction necessary to elevate the gate 0, and then in an opposite direction to permit the gate to return to the floor and close the entrance to the hatchway.

The travel of the first half of the rack L across the face of the spur-wheel J elevates the gate 0, and the travel of the last half of the rack across the spur-wheel permits the descent of the gate. The action of the device is precisely the same whether the spur-Wheel be rotated from left to right by the downward motion of the rack L or from right to left by its upward motion.

Although I prefer to use the spur-wheel J, as shown, with one of the teeth longer than the others, as this I deem the preferable form, yet I do not wish to be limited to this precise construction, as the ordinary form of spur-Wheel may be used; or the rack L and spur-wheel J may both be discarded and a friction Wheel and friction-rail be substituted, the essential requisite being that the length of the rack or rail shall be about equal to the circumference of the spur-wheel or friction-pulley, and that for each complete travel of the rail or rack across the spurwheel or frietion-pulley there shall be a corresponding revolution of the spurwheel or friction-wheel and of the wrist or crank pin j.

Having described my invention, what I claim is- 1. The combination, with the elevator-carriage and the vertical rack-bar attached to one of the upright standards, of a pinion, J, a rack-bar, H, arranged horizontally in suitable guides, and having one end connected with the pinion J by a pitman, K, a pinion, en-

gaging the horizontal rack, and mechanism connecting the pinionfand the elevator-gate and actuated by the reciprocal movements of the horizontal rack-bar for raising and lowering said gate, all substantially as described.

2. In automatic opening and closingsafetygates for elevators, a device for transmitting motion from the ascending or descending platform to the vertically-sliding gate 0, consisting, essentially, of a straight rack and atoothed gear, said gear being provided with a wrist or crank pin and a pitman connected to and opcrating a reciprocating rack, H, apinion, f, a sheave, F, and ropes G and D, the rack and toothed gear so arranged with relation to each other and tot-he remainder of the device that the passage of the first half of the rack across the face of the gear shall elevate the gate 0, and the passage of the last half of the rack across the face of the gear shall depress the gate to its original position, Whether approached from above or below by the platform A, substantially as and for the purpose described.

In testimony \vhereofI have signed my name to the foregoing specification in the presence of two subscribing witnesses.

GEORGE AUKERMANN.

Witnesses:

0. W. WITHENBURY, AMBROSE TEMPLE.

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