US830427A - Elevator-guard. - Google Patents

Description

.No. 830,427. PATENTED SEPT. 4, 1906. w. K. FRASER.

ELEVATOR GUARD.

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No. 830,421 PATENTED SEPT. 4, 1906. w. K. FRASER.

ELEVATOR GUARD. APPLIOATION EILED APR. 24, 190R 2 SHEETS-SHEET 2. D

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UNITED STATES PATENT OFFICE.

WILLIAM K. FRASER, OF BREWER,

MAINE, ASSIGNOR OF ONE-EIGHTH TO JAMES H. BURGESS, OF BANGOR, MAINE, AND ONE-EIGHTH TO FRANK A. FLOYD, OF BREWER, MAINE.

ELEVATOR-GUARD.

Specification of Letters Patent.

Patented Sept. 4, 1906.

Application filed April 24, 1906. Serial No. 313.504.

To all whom, it may concern.-

Be it known that I, WILLIAM K. FRASER, a citizen of the United States, residing at Brewer, in the county of Penobscot and State of Maine, have invented new and useful Improvements in Elevator-Guards, of which the following is a specification.

This invention relates to elevator-guards and the operating mechanism therefor, the object of the present invention being to provide a guard or door for the openings of elevator wells or shafts associated with mechanism for automatically operating said door or guard to open the same upon the approach of an elevator and close the same as the elevator moves onward therefrom, the mechanism operating automatically and requirin no attention on the part of the operator of the elevator or car.

One of the main objects of the invention is to provide in connection with a movable guard or door for the purpose described a latch for securely holding the door when closed, combined with mechanism for withdrawing the latch and then operating the door to open the same, the mechanism subsequently operating to close the door or guard and relatch the same.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination, and arrangement of parts hereinafter more fully described, illustrated, and claimed.

In the accompanying drawings, Figure 1 is a view in elevation of an elevator door or guard, showing the operating mechanism therefor. Fig. 2 is a similar view showing the operation of the latch mechanism, also the door opening and closing mechanism. Fig. 3 is a plan view of the same.- Fig. 4 is an enlarged inside face view of the bearingbracket. Fig. 5 is a plan view of the slide or draw-bar.

In carrying out the present invention I employ a door or guard consisting of horizontal rails 1 and 2, connected by vertical palings or pickets 3, each of which is pivotally connected at the points 4. and 5 to the up er and lower rails 1 and 2, respectively. ny desired number of horizontal rails and any desired number of pickets or palings may be employed.

One of the horizontal rails of the guard or door and preferably the upper one is extended far enough to provide for pivotally connecting the same at 6 to the frame of the elevator shaft or well at one side of the opening across which the door or guard extends, as shown in Fig. 2, and under the preferred embodiment of this invention a bearingbracket 7 is secured to the frame of the well or shaft and provided with the pivot 6, upon which the top rail of the guard is mounted. Said rail is also extended a considerable distance beyond the pivot 6 to provide a leverarm 8, and under the preferred embodiment of the invention a counterbalance-weight 9 is mounted on the extremity of said arm to facilitate the folding and unfolding or opening and closing of the guard. Journaled upon the bracket 7 is a gear-wheel 9, from which a pitman or connecting rod 10 extends to and pivotally connects with the lever-arm 8, as shown in Fig. 1, so that as said gear-wheel 10 revolves the pitman will vibrate the leverarm 9 and open or close the guard, the guard swinging upward and folding against one side of the doorway.

Connected to the car or elevator (shown at 11) is a post 12, to which is connected a vertically-extending rack-bar 13, which meshes with the gear-wheel 10, so as to impart rotary motion to said wheel in the movement of the elevator up and down, the length of the rack-bar 13 being equivalent to the circumference of the wheel 10, whereby one complete revolution is imparted to the wheel 10 in the complete movement of the rack-bar 13 across the toothed periphery of said wheel, thereby effecting a complete opening and closing of the guard.

Adjacent to each end the rack-bar is provided with a cam-surface 14, which presses outward against a roller 15, carried by a slide or draw bar 16, which slides back and forth in a groove 17 in the inner face of the bracket 7. This draw-bar has attached thereto at the point 18 a flexible connection 19, which may consist of a chain or cable, the latter passing through the upper rail 1 of the guard, said rail being preferably made hollow or provided with a passage extending lengthwise therethrough from end to end, as shown in Fig. 2, to receive such cable or chain. Connected to the opposite end of said chain or cable is a latch-bolt 20, the extremity of which is urged outward to engage a suitable keeper 21 on the frame of the well or shaft by teeth of the gear 9 the cam-surface 14 at one end of the rack moves the draw-bar 16 in a direction away from the doorway, thus pulling on the connection 19 and withdrawing the latch-bolt 20 from the keeper 21. As the guard again reaches its closed position the remaining cam-surface 14 at the opposite end of the rack-bar again withdraws the latch and then releases it, allowing said latch to move into engagement with its keeper.

It will thus be seen that the operation of the guard is entirely automatic, requiring no attention on the part of the operator, the mechanism serving to unlatch the guard, open the same, again close the guard, and relatch the same.

I claim 1. The combination with a pivoted and swinging guard or door for an elevator-shaft, and a latch bolt and keeper for locking the guard, and means actuated by the movement of the car for withdrawing the latch from the keeper, swinging the guard on its pivot and subsequently releasing the latch to again lock the guard.

2. The combination with a pivoted and swinging guard or door for an elevator-shaft, and a spring-sustained latch for locking said guard or door, of means actuated by the movement of the car for withdrawing the latch, opening and closing the guard or door by a pivotal and swinging movement and releasing the latch.

3. The combination with the guard or door of an elevator-shaft, said door being provided with a hollow rail, of a spring-held latch carried by the guard or door, and means actuated by the elevator-car and including a connection which passes through the hollow rail of the guard or door, operating to withdraw the latch, open and close the guard or door and release the latch, substantially as described.

4. The combination with the guard or door of an elevator-shaft, and a latch carried by the guard or door, of a slide or draw-bar connected with said latch, a rotary element connected with the guard for opening and closing the same, and a rectilinearly-movable element carried by the car and adapted to engage the draw-bar for shifting the latch and also adapted to engage the rotary element for opening and closing the car or door.

5. The combination with the guard or door of an elevator-shaft, and a latch carried thereby, of a draw-bar connected with said latch, a gear-wheel connected with the guard or door to open and close the latter, and a rack carried by the car and engaging said gear-wheel to rotate the latter and provided with one or more cam-surfaces which operate to move the draw-bar and shift the latch, substantially as described.

6. The combination with the guard or door of an elevator-shaft and a latch carried thereby, of a gear-wheel operatively connected with the guard or door for opening and closing the latter, a sliding draw bar connected with said latch, and a rack-bar carried by the car and adapted to engage said gear-wheel to impart rotar movement thereto and also provided wit cam-surfaces arranged at a suitable distance apart and operating to move the draw-bar to shift the latch for the purpose of withdrawing the same'preparatory to opening the guard or door and release the same to lock the guard or door after the latter is returned to its closed position.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM K. FRASER.

Witnesses:

FREDERICK H. CosTELLo, OSCAR L. OLSEN.

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