US1220741A - Safety device for elevators. - Google Patents

Description

W. H. GULDER.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION 111110 MAY 27. 1915.

,QQOUML Patented Mar. 27, 1917.

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W. H. (SOLDER.

SAFETY DEVICE F-OR ELEVATORS.

APPLICATION FILED MAY 27. 1915.

l ,2%@341 n Patented Mar. 27, 1917.

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WILLIAM'E. GOLDER, OFNEWARK, NEW JERSEY.

SAFETY DEVICE FOR ELEVATORS.

Application filed May 27, 1915.

To all whom t may concern."

lle it known that l, WILLIAM H. GOLDER, a citizen of the United States, residing at ewark, in the county of Essex and State cf New Jersey, have invented certain new and useful improvements in Safety Devices for Elevators; and l do hereby declare the :following to be a full, clear, and exact description of the same, reference being had to the accompanying Y. drawings, forming part of this specification, and to the figures and letters of reference marked thereon.

rlhis invention relates to improvements in elevator safety devices, and more particularly to a novel arrangement for preventing access to the elevator shaft except at a landing at which the car is in full stop position.

'lhe novel features of the present invention are advantageously embodied in a system in which locking mechanism is provided for preventing opening of the landing door except when a car has arrived at full stop position at the landing, the locking mechanism being engageable by connections carried by the car, which connections, upon manipulation of the controller to full stop position, are effective to release the locking mechanism and thereby permit opening of the door. Opening of the door in turn actuates suitable mechanismvwhich locks the controller in full stop position, and consequently, movement 'of the car, while the landing door is open, is prevented. 'llhc primary object of the present invention is to generally improve and simplify the construction of elevator safety device operating in accordance with the aforesaid system and to so reduce the number of parts that the device may be installedwithin reasonable limits of cost.

A full understanding of the invention will be attained from the following detailed description taken in connection with the accompanying dra-wings which illustrate a structural embodiment of the invention in a preferred form, and the novel features of the invention will be particularly pointed out and specified in the appended claims.

ln the drawings,-

Figure 1 is a fragmentary transverse section of an elevato-r shaft at a landing point and also of an elevator car shown just before the car has arrived at or just after leaving the landing, .the car and landing Specification of Letters Patent.

Patented Mar. 27, 191% Serial No. 30,793.

door being equipped with a safety device constructed in accordance with the present invention.

Fig. 2 is a fragmentary plan view show ing the parts in the same positions illustrated in Fig. 1.

Fig. 3 is a view similar to Fig. 1 but showing the car in full stop positicnrat the landing, and the positions which the parts assume when the controller is thrown to full stop position.

Fig. 4 is-a view similar to Fig. 3 but showing the position of the parts after the door has been opened and the controller locked in full stop position.

Like letters of reference in the several figures indicate similar parts.

The elevator shaft 1 is provided with a suitable landing, this being indicated diagrammatically by the transverse sill 2, and t the landing cage 3 having a landing door 4:. As is customary the landing door is preferably mounted for sliding movement within the cage to permit access to the shaft 1, when the car is in passenger receiving or discharging position, in front of the landing cage 3, and the door will also be provided with a manually operable latch or other device 5 by which it can be opened or closed from the interior of the car.

Mounted on the landing door t, for in* stance, by means'of a depending U-bracket 6 is a wheel or 'roller 7. When the parts are in such relation that the door can be opened, said wheel 7 travels upon amovable track 8 which consists, inthe form illustrated in the drawings, of a rod having a bent extension 9, and the free end of said extension is pivotally mounted on a supporting bracket 10 resting on the transverse sill 9,. Extending from the pivotal point of the movable track 8 is a bell crank lever 11 having at the free end of its horizontal arm 12 a roller or other suitable contact device 13. A spring 14, secured at one end to the bell crank lever 11 and at the other end to sill 2, normally urges the bell crank lever into such position that movable track 8 is thrust upwardly into the path of wheel 7.

Pivotally mounted in a supporting bracket 1'5 resting upon the sill 2, is a locking member or plate 16. Said locking member 16 is provided with an upper locking pin 17 and a lower locking pin 18, the pins being so positioned that the line connecting their centersis oblique with respect to the vertical dimension'V of the locking member 16. A spring 19 having one'end secured to the locking member andthe other secured to the sill 2 maintains the locking member normally in substantially vertical position. rlhe locking member is located approximate to that end of the movable track 8 opposite from the pivotal point of said track and when the parts are in their normal relation, as shown in Figs. v1 and 2, the end of the movable track is projected between the locking pins 17 and 18. Locking pin 17 forms a stop against farther upward movement of the track 8 about its pivot and lowerlocking pin 18 prevents downward pivotal movement of said track. It will be noted that when the movable track'is thus retained or locked by the pins it lies in a plane oblique with respect to the Vplane of travel of roller 7 and thereby forms an absolute stop against movement of roller 7 along the track consequently preventing opening ot' the landing door.

Extending downwardly from the pivotal point of the locking member 16 is a bell crank lever 20, the horizontal arm 21 of which is'V provided at its free end with a roller or suitable contact member 22. Pivotal movement of the bell crank lever 20 will be transmitted to the. locking member 16 and such pivotalmovement of the bell crank lever is accomplished by controller operated vconnections carried by the elevator car, as

will presently appear. -Mounted on the controller box23 within the car 24 is a kconventional type of controller lever 25 having a depending arm 26 responsiveto movement of said lever. At the lower end of said arm -26 is a roller or suitable contact piece 27 engageable with a lug 28, when the controller lever 25 is shifted by the operator to vertical position, or to position to shut'o power from the car and thereby cause the caa` to make a full stop. A lug 28 is mounted on the upper end of a rod 29 slidable within a bearing bracket 30 secured to a wall of the car 24. At its lower end rod 29 is pivotally connected to a link 31, which link projects through an opening in the car tloo-r and is pivoted at its lower end to the horizontal arm of a bell lcrank lever 32. The bell crank ever is rockably mounted at 33 in a supporting bracket 34 secured to the under side oi the car floor. The vertical arm 35 or the bell crank lever 32 is pivoted at its free end to an operating rod 36. Said operating rod 36 is in turn pivotally connected at 37 to a swinging arm 38 mounted at its inner end in a bracket plate 39 (see Fig. 2). Swinging movement of the arm 38 is limited by means ot a'bracket 40 having spaced stops 41, 42, between which said arm 38 projects, and a spring 43 normally urges arm 38 into en gagement with stop 42. The outer end of arm 38 projects beyond the side of the car facing the landing sill 2 and said outer end is provided with a member 44 adapted to make contact with roller 22 carried by bell crank lever 20 when arm 38 is drawn by rod 36 toward stop 41. As shown, said member 44 is provided with a dished surface 45 so as to afford a proper engagement with roller 22 when said arm 38 is thrown in the direction described. It will be noted that swinging arm 38 and its connections are structurally independent of the controller lever and hence are unaffected by movements et the controller lever, except when the controller lever is shifted to full stop position, when contact piece 27 engages lug 28 and moves rod 29 downwardly. This arrangement leaves the controller free to operate `unhampered by a long connected chain of parts, except when the car is brought to a dead stop. The life of the connections to rod 29 is considerably greater than would be the case, it every slight movement of the controller were transmitted to them.

Fixed to the controller arm 25 is a notched lug 46 and pivotally mounted in a support 47 carried by the side of the car 24 is a locking lever 48 having a locking hook 49 adapted to enter the notch in lug 46. Movement of the locking lever 48 is effected by the rod 50 connected at its upper end to said locking lever and at its lower end with the horizontal arm 51 of a bell crank lever 52 in a supporting bracket 52n projecting 'from the under side of the car floor. The vertical arm 53 of said bell crank lever is connected to a rod 54, which rod 54 is pivoted at 55 to a swinging arm 56. Said arm 56 is mounted similarly to arm 38 and as shown in the drawings, is adapted t0 swing between stops 57, 58, provided by a bracket 59 through which said arm 56 is projected. A. spring 60 urges the operating arm into contact with stop 58. The free end 0l the operating arm projects in like manner beyond the side of the car facing the sill 2 and is similarly provided with a member 61 for cooperation with roller 13 carried by the horizontal. arm 12 of bell crank lever 11.

The operation of the above described mechanism is as follows:

`When the elevator car has arrived at a position approximate to the landing door 4, movement oit the controller lever 25 to vertical or full stop position, as shown in Fig. 3, causes contact piece 27, carried at the end of arm 26, to engage lug 28, thereby forcing rod 29 downwardly and through link 31 throwing bell crank lever 32 in a direction to draw rod 36 to the left, as shown in Fig. 3. This movement of rod 36 swings arm 38 until said arm contacts with stop 41, thereby causing member 4l to engage roller 22 and shift bell crank lever 2O to the position indicated by dotted 'lines `in Fig. 3. Swinging of bell crank lever 20 also swings lockingmem'ber 16 outwardly away from track 8 so that locking pin 18 is i'emoved `frombeneath the end of `the track as shown in IFig. A3. lNhen the parts are thusdispesedmovable track 8 is free to `move downwardly about its pivot and at the same time'is retained from springing upwardlyiby upper locking pin 117 which `is still in engagement with the end of track 8. Track 3 being free to'move downwardly,

`the landing door 4 may be opened, roller 7 swinging arm 5G in a `manner-to throw said arm against stop 57 and through connecting rod v54 operate bell-crank lever 52. @peration of bell crank lever 52 throws rod 50 upwardly and such movement of rod 50 causes locking'hook 49 to engage the notched lug 46 in the manner shown in Fig. 4, and, consequently, lock the controller lever in full stop position. Movement of the controller lever to apply power to the car is thus prevented so long yas the landing door is open.

W'hen the landing door is closed spring 14 withdraws roller 13 from engagement "with member Gland consequently spring 60 is released throwing operating arm 58 back to the position shown in Fig. 2 and through the intermediate connections lifting locking lever 48 thereby permitting free movement or manipulation of the controller 25. When the controller 25 is thrown to position to start the car, roller 27 is disengaged from lug Q8 thereby permitting spring 43 attached to arm 3S to lift rod 29 and swing arm 38 to release member 44 from contact with roller 22. This permits spring 19 to restore locking member 1G to the position shown in F ig. 1 with lower locking pin 18 beneath'the end of movable track 8 holding said track in elevated position so as to form a positive stop against opening of the door.

1. In an elevator safety device, the combination with an elevator shaft, landing door and elevator car having a controller, of a movable track mounted on the landing, a wheel carried by` the landing door and adapted to travel on said track, mechanism for locking said track in such position that the track forms an obstruction vto the travel of the wheel and thereby prevents opening of the landing door, connections carried by the car and engageable with said locking mechanism to release the locking mechanism from locking relation with respect to the track upon arrival of the car at a landing,

and means for operating said connections by throwing the controller to full stop position.

2. In an elevator safety device, the combination with an elevator shaft, landing door track upon arrival ofthe car at a landing, means for operating said connections by throwing the controller to full stop position, and ymeans operated by opening ofthe landing door for locking the controller in full stop position.

3. In an elevator safety device, the'combination with an elevator shaft, landing door and elevator car having a controller,

`of a movable track mounted on the landing,

a wheel carried by the landing door and adapted to travel on said track, mechanism for locking said track in such position that the track forms an obstruction to the travel of the wheel and thereby prevents opening of the landing door, and connections carried by the car and structurally independent of the controller but arranged to be positively operated by the controller when the controller is shifted to full stop position, said connections being engageable with said locking mechanism to release the locking mechanism from locking relation with respect to the track upon arrival of the car at a landing and shifting of the controller to full stop position.

4. In an elevator safety device, the combination with an elevator shaft, landing door and elevator car having a controller, of a movable track mounted on the landing, a wheel carried by the landing door and adapted to travel on said track, mechanism for locking said track in such position that the track forms an vobstruction to the travel of the wheel and thereby prevents opening of the landing door, connections carried by the car and structurally independent ofthe controller but arranged to be positively operated by the controller when the controller is shifted to full stop position, said connections being engageable with said locking mechanism to release the locking mechanism from locking relation with respect tov the track upon arrival of the car at a landing and shifting of the controller to full stop position, and means operated by opening of the landing door for locking the controller in full stop position.

5. In an elevator safety device, the comvfrom locking relation with respect tothe bination With an elevator shaft, landing door and elevator car having a controller, of a movable track mounted on the landing, a Wheel carried by the landing door and adapted to travel on said track, mechanism for locking said track in such position that the track forms an obstruction to the travel of the wheel and thereby prevents opening` of the landing door, connections carried by the car and engageable With said locking mechanism to release the locking mechanism from locking relation with respect to the track upon arrival of the car at a landing, means for operating said connections by throwing the controller to full stop position, said track after release being moved by travel of the Wheel thereupon during opening of the landing door, and means responsive to said movement of the track for locking the controller in full stop position.

6. In an elevator safety device, the com` bi-nation With an elevator shaft, landing door and elevator car having a controller,

of a movable track mounted on the landing,

a Wheel carried by the landing door and adapted to travel on said track, mechanism for locking said track in such position that the track forms an obstruction to the travel of the Wheel and thereby prevents opening of the landing door, connections carried by the car and engageable with said locking mechanism to release the locking mechanism from locking relation with respect to the track upon arrival of the car at a landing, means for operating said connections by throwing the controller to full stop position, said track after release being moved by travel of the Wheel thereupon during opening of the landing door, means responsive to said movement of the track for locking the controller in `full stop position, and a spring for restoring the track to Wheel travel obstructing position and for simultaneously releasing said controller locking means upon closing of the landing door.

WILLIAM H. GOLDER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C.

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