US2499481A - Elevator lock - Google Patents

Description

March 7, 1950 H. A. FLINT ETAL 2,499,43l

ELEVATOR LOCK Filed Oct. 4, 1947 2 Sheets-Sheet 1 ATTORNEY March 7, 1950 H. A. FLINT ETAL. 2,499,481

ELEVATOR LOCK Filed Oct. 4, 1947 2 Sheets-Sheet 2 Fly. 4

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Patented Mar. 7, 1950 ELEVATOR LOCK Harold A. Flint, San Francisco, and Charles F. Lantz, Oakland, Calif.

Application October 4, 1947, Serial No. 777,978

This invention relates to safety devices for elevators, and has for its principal object the provision of an elevator lock having the dual function of preventing operation of the elevator while the gate is in the open position, and preventing the'opening of the gate while the elevator is at other than the floor level.

We accomplish the above by means of the mechanism described in the following specification and illustrated in the accompanying drawings forming a part hereof, and in which Figure l is a front elevation of the locking mechanism with the housing cover removed.

Figure 2 is a side elevation, partly in section, as seen from line 2-2 of Figure 1.

Figure 3 is an elevation similar to Figure 2 as seen from line 3-3 of Figure 1.

Figure 4 is a fragmentary detail showing the device as applied to an elevator and shaft.

Referring to the drawing in detail, a rectangular housing 5 has a mounting plate 6, spaced apart from the back wall 1 thereof, for a portion of its length, to form a slot 8, therewith. Rectangular openings 9 and ill, in the wall 1 communicate with the slot 8.

Pivotally mounted by shaft H, in the upper end of the housing 5, is a latch l2 adapted to be operated by an arm l3 fixedly mounted on the exterior extending portion of the shaft H. The arm !3 is provided with a roller 14 mounted at latch I2 is adapted to swing from a gate engaging position as shown in solid lines on Figure 3, to the gate releasing position as shown in phantom.

Also pivotally mounted within on a shaft i4, is a double latch l5 which has, secured to one side thereof, a mercury switch [6 wired to a terminal block I! located on the back wall 1 near the lower end thereof. Upon installation of the safety device, wires are brought through an opening I8 in the bottom of the housing 5, and secured to the terminal block l1, putting the switch [3 in one side of the power circuit to the elevator motor.

The double latch I5 is adapted to swing from a switch closing position, as shown in solid lines the housing 5,

on Figure 2, to a switch opening position as shown in phantom.

One of the safety devices is installed on the inner wall IQ of the elevator shaft, at each floor, as indicated on Figure 4. The elevator 20 is pro vided with a cam 2| adapted to engage the roller Mand swing the arm l3 to open the latch I2 as shown in phantom on Figure 3.

The entrance to the elevator at each floor is 7 Claims. (Cl. 187-31) and an electric gate eng fging the power; circuit of an protected by a gate 22 fitted with a bar 23 adapted to enter the slot 8. These gates are always locked by the engagement of the bar 23 with the latch i2, as shown on Figure 3, and can only be re leased when the elevator is at the particular floor, by the action of the cam 2|, as shown on Figure 4 The upper edge of the chamfered as at 24, and the top edge of the back wall 1 extends forwardly and upwardly to form a flange 25, both contributing to the easy entry of the bar 23 into the slot 8.

Referring to Figure 2, it will be seen that open ing of the gate 22 will cause the bar 23 to engage the latch l5, at its upper hook 2E, and swing it to the position shown in phantom, tripping the mercury switch 16 and breaking the power circuit to the elevator. With the switch H5 in this position, operation of the elevator is impossible. When the gate is closed, the bar 23 engages the latch H3 at its lower hock El, and returns it to the switch closing position, allowin theelevator to be set in motion. An opening 28 in the mounting plate 6 provides clearance for the latches I2 and E5.

The housing 5 is normally closed by means of a sheet metal cover, which has been omitted on the drawings in the interest of clearer delineation of the interior mechanism.

While we have disclosed a preferred embodiment of our invention, it will be understood that modifications may be made Within the spirit and scope of the appended claims.

We claim:

1. An elevator lock for use at a floor with an elevator and an elevator gate comprising: a first gate engaging latch adapted to be actuated by an elevator adjacent the floor, a second gate engaging latch adapted to be actuated by a gate, and an electric switch controlled by said second gate engaging latch for breaking and making the power circuit of an elevator, said second gate engaging latch being provided with a pair of spaced projections adapted to be successively engaged by opening and closing movements of the gate.

2. An elevator lock for use at a floor with an elevator and an elevator gate comprising: a first gate engaging latch adapted to be actuated by an elevator adjacent the floor, a second gate engaging latch adapted to be actuated by a gate,

latch for breaking and making elevator, said second gate engaging fl'atch being provided with a pair of spaced projections adapted to be successively mounting plate 6 is I switch controlled by said second '3 a it engaged by opening and closing movements of the gate, said first gate engaging latch being adapted to permit opening the gate only when so actuated by an elevator.

3. An elevator lock for use at a floor with an elevator and an elevator gate comprising: a first pivotally mounted gate engaging latch adapted to be actuated by an elevator for looking a gate in closed position except when so actuated, a second pivotally mounted gate engaging latch spaced from said first latch and adapted to open and close the power circuit of said elevator by the opening and closing movements of the gate.

4. An elevator lock for use at a floor with elevator and an elevator gate comprising first and second gate engaging latches adapted to be sue cessively and independently actuated by the elevator and gate respectively, said first latch being adapted to prevent opening of the gate except .Whenso actuated, said second latch being adapted to open and close the power circuit of the ele :Vator by the opening and closing movements of the gate.

5,. An elevator lock for use at .a floor with an elevator and an elevator gate comprising a housp-illg having a slot extending longitudinally of the path of travel of such a gate, a first pivotally mounted gate engaging latch adapted to be actuated by an. elevator for looking a gate in t closed position except when so actuated, a second pivotally mounted gate engaging latch longitudinally spaced from said first latch and adapted to open and close the power circuit of said elevator by the opening and closing movements of the-gate.

6. An elevator lock for use at a floor with an elevator and an elevator gate comprising a housing having .a slot extending longitudinally of the path of travel of such .a gate, "a first pivotally mounted gate engaginglatch adapted to be actuated by an elevator for locking a gate in closed position except when so actuated, a second pivotally mounted gate engaging latch longitudinally spaced from said first latch and adapted to open and close the power circuit of said elevator by the opening and closing movements of the gate, a gate engaging tooth on said first latch for movement into and out of said slot depending upon the position of the elevator, a pair of longitudinally spaced projections on said second latch adapted to be successively engaged by the gate by opening and closing movements of the latter ior swinging said latch out of and into circuit closing position.

:7. An elevator lock for use at a floor with elevator and an elevator gate comprising: a housing having .a ,slot extending longitudinally of the path of travel of such a gate, a first gate engaging latch adapted to be actuated by an elevator for looking a gate in closed position except when so actuated, a second gate engaging latch swingably mounted on said housing and spaced longitudinally from said first latch, spaced projections on said second latch. adapted to be I successively enga ed by opening and closing movements of said gate, and a switch secured to said second latch actuated by swinging movements of the latter for opening and closing the power circuit to said elevator.

HAROLD A. FLINT. CHARLES E. LANTZ.

REFERENCES CITED The .afollow'ing references are of record :in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,662,342 Schweig Mar. 13 .1928 2,075.292 Kaylor Mar. 30, 1937

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