US790678A - Safety-lock for elevators. - Google Patents

Description

No. 790,678.' PATENTED MAY 23, 1905.

- L. GHRISTIANSEN. A

SAFETY LOCK PGR ELEVATORS.

APPLIOATION FILED DEO.`12, 1904.

MHH mn "Il" IMT UNITED STATES Patented May 23, 1905.

PATENT OFFICE.

SAFETY-LCK FOR ELEVATORS- SPECIFICATION forming part of Letters Patent No. 790,678, dated May 23, .1905. Application filed December 12,1904. Serial Nox 236,170.

To all whom/it Irl/ay concern:

Be it known that I, LUDWIG CHRISTIAN- sEN, a citizen of the United States, residing at Lynn, in the county of Essex and Stateof Massachusetts, have invented certain new and useful Improvements in Safety-Locks for Elevators; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as will enable others skilled in the art to Which it appertains to make and use the same.

The present invention relates to improvements in safety-locks for elevators. y

It is customary to control the movements of elevators by a rope or wire cable hanging in the elevator-well and passing through or beside the elevator-car, the rope being grasped by the operator and pulled up or down, according to the direction in which it is desired to cause the car to move.l In order to prevent accidental movement of the car when it is standing at a door and receiving or discharging freight, it is customary to provide the elevator with a device for locking the controlling-rope, so that the rope cannot be moved either from accidental causes or by a person standing at another door.

The object of the present invention is to reorganize and improve such devices in the respects hereinafter pointed out; and to this end the invention consists in the improved safety-lock hereinafter described and claimed.

In the drawings, Figure 1 is a side elevation of a device embodying the present invention, and Fig. 2 is a similar view with the nearer half of the casing removed. Fig. 3 is a horizontal section on line Fig. 1, showing the interior mechanism in plan 5 and Fig. 4 isA an elevation of the finger-lever looking from right to left in Fig. 2.

The illustrated embodiment of the invention is designed to be secured by suitable means tothe elevator-car'and has an opening through which Athe controllingrope passes. Thesize of this opening is varied by sliding gates, and at each floor the elevatorrope is provided with two or more knobs fixed thereto. The size of the opening in the lock is normally sufficient to permit the knobs to shank 9.

pass freely therethough; but when it is desired to lock the elevator in place the gates are closed upon the rope between two of the knobs, which are secured upon the rope close together and in proper position with respect to the floor at which the elevator stops. When the gates are closed in this manner, the controlling-rope cannot be moved up or down. As the present invention relates to improvements in the form and construction of the lock alone and as its general mode of operation, as above described, is familiar in the art to which this invention relates, the drawingsY show only the construction of the lock, and it will be understood that the lock cooperates with the rope and the knobs in the ordinary manner and that the look is Inounted and secured in the car by any usual or suitable means.

A casing 1 incloses the working parts of the Adevice and comprises two similar parts secured together by screws 2. The casing has funnel-shaped portions 3, through which the rope asses, and a stem 4., by which it is secure to ythe elevator-car, the stem being iiXed in a suitable column or bracket. The

-gates 5 and 6 are arranged to slide in a central slotted portion 7 of the casing, and the means by which they are actuated are arranged in a novel andcompact manner. The gate 5 is in the form of a bail, having two parallel side membersS, and the gate 6 is arranged to slide between the side members 8 and in the same plane as the gate 5. The gate 6 has a straight shank 9, and the side members 8 are bent inward close to the shank 9 and then again parallel therewith, `so as to form two parallel shanks 10, between which the shank 9 is embraced and slides. Two lugs 11 on the'shanks 10 are engaged by a plate 12, forming part of a finger-lever 14, pivoted at 13 in the casing and provided with a shoulder 15, engaging a lug 16 on the In the drawings the gates are in their closed position; but if the finger-lever be drawn to the right, as shown in dotted lines, Fig. 2, the plate 12 and shoulder 15 will force the lugs 16 and 11 away from each other and move the shanks 9 and 10 longitudinally with respect both to each other and to the casing 1, thereby moving the gates to their open position and leaving the opening 17 (shown in dotted lines in Fig. 3)"free Jfor the passage of the knobs on the elevator-rope. The gates are closed when the iingerelever is returned to its left-hand position by a spring 1S engaging at one end a lug 19 on the gate 6 and at the other end a plate 20, resting against the lugs 11, connected through the shanks 10 with the gate 5. The weight of the fingerlever tends to hold it in either position until it is moved by the operator, and when the gates are closed accidental movement of the finger-lever is resisted by the lugs pressing under the influence of the spring against the plate 12 and shoulder 15. When the iingerlever is in its right-hand position and the gates are open, the iinger-lever has no tendency to move back and permit the gates to close, as the pressure of the lugs 11 and 16 against the plate 12- and shoulder 15 is substantially in the same line.

The relative arrangement of the gates and the linger-lever makes a very compact device and eliminates all lateral thrust on the gates and their shanks, so that the parts move easily, with no tendency to bind. As the mechanism is all on one side of the rope, the lock can be used in very close quarters*as, for instance, where the controlling rope runs very near the side of the corner of the car and the swinging movement of the iinger-lever in a vertical plane makes the device convenient for the operator and contributes, as above described, to the security of the device by making the weight of the finger-lever available to maintain the lever in the position in Which it is placed. A single spring serves to move the gates simultaneously in opposite directions and also to hold the inger-lever in position, and since the thrust of the lugs 11 and 16 against the plate 12 and the shoulder 15 is balanced there is no lateral pressure on the pivots 13 and the wear on the pivots is very slight.

I claim* 1. A'saiety-lock 'for elevators, having, in combination, a casing, two gates arranged te slide in opposite directions therein, the gates lying in the same plane and having parallel shanks, a pivoted iinger-lever engaging lugs on the shanks and acting to force them apart and open the gates, and a spring acting to close the gates when the finger-lever is operated to release the lugs, substantially as described.

2. A safety-lock for elevators, having, in combination, a easing, a bail-shaped gate arranged to slide therein and having parallel side members and shanks, a cooperating gate arranged to slide between the side members of the bail-shaped gate and having a shank lying between the shanks of the said gate, lugs on the shanks of the gates, and means for engaging the lugs and moving the gates simultaneously and in opposite directions te open or close the gates, substantially as described.

3. A safety-lock for elevators, having, in

combination, a casing, two gates arranged to slide in the easing, one of the gates being bailformed and. the other gate being arranged to slide between the side members of tlwfl'ormer, two parallel Shanks on the bail-shaped gate., the shank on the other gate lying between the said shanks, lugs on. the Shanks, a pivoted linger-lever engaging the lugs and. arranged to swing in a vertical plane and to move the lugs simultaneously in opposite directions to open the gates, and a spring to close the gates substantially as described.

In testimonywhereof I a'ilixmy signature in presence of two witnesses.

LUDWIG CHRISTIAN SEN Witnesses FRED O. Fisn, Hormon VAN EVEREN.

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