US1223157A - Elevator-door-locking mechanism. - Google Patents

Description

E. L. DUNN.

ELEVATOR DOOR LOCKING MECHAN APPLICATION HLED MAY 25, l9l2 ISM.

1,223, 157. Patented Apr. 17,1917. 2 EEEEEEEEEEEE I.

WITNESSES ,2. nvmvnm 2 B) 2 ma s ski EDWARD L. DUNN, 0F WORCESTER, MASSACHUSETTS, ASSIG-NOR, BY MESNE ASSIGN- MENTS, TO STANDARD PLUNGER ELEVATOR COMPANY, OF WORCESTER, MASSACHU- SETTS, A CORPORATION OF MASSACHUSETTS.

ELEVATOR-DOOB-LOCKING MECHANISM.

To all whom it may concern:

Be itknown that I, EDWARD L. DUNN, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in File vator-Door-Locking Mechanisms, of which the following is a full, clear, and exact specification.

This invention relates to elevator door locking mechanism, and has particular reference to means for preventing the opening of an elevator well door except when the car is at rest opposite the door.

The invention is especially intended for use in connection with power operated dumb waiter systems, wherein dumb waiter cars are required to at all times operate as high as 600 feet per minute. In such systems, it is necessary, in order to protect the attendants, to prevent them from opening the hatchway doors except when the car has stopped at their floor to be loaded or unloaded. Various means for controlling the doors of dumb waiter and other elevator systems have heretofore been devised, wherein, so far as Iam aware, the doors have been normally held locked, and automatically unlocked either as the car passed each floor, or automatically unlocked only when the car stopped at the floors.

According to this invention, I have devised a door locking mechanism in which the door when closed is not locked, but which is automatically looked as soon as an attendant tries to open it, unless the car is stopped at that floor, whereupon the lock controlhng devices cooperate with the car in such manner as to prevent the look from operating, and thereby'permit the door to be opened.

In the accompanying drawings, Figure l is a plan view of a portion of an elevator system equippedwith this invention;

Fig. 2 is an elevation taken along the line 2, 2 of Fig. 1, viewed in the direction of the arrow;

Fig. 3 is an elevation showing the inven- Specifieation of Letters Patent.

PatentedApr.-17,1917.

Application filed May 25, 1912. Serial No. 699,693.

tion in normal condition with the door closed and unlocked; f

' Fig. 4 shows the door partially raised and locked; 1

Fig. 5 shows the'unlocked position with the door partially raised and the latch held out of engagement by cooperation with the car; and p Figs. 6 and 7 are detail views, respectively, of the latch and the actuating cam,

Referring to the drawings, 1 represents the hatchway of'an elevator containing the car 2 and closed by a door 3, herein shown as a vertically movable door sliding between guides 4: and carried by the building. I do not restrict myself to the particular form of vertically sliding door herein shown, as the invention is applicable w'ithoutmaterial modification, or any departure from the invention, to either horizontally sliding doors or hinged doors, such applications of the invention not being necessary to be illustrated herein and being covered by the attached claims. The door 3 is normally unlocked, and is provided with a keeper 6, which is engaged by a latch 7 pivoted on the door frame at 8, to hold the door locked. The pivot 8 carrying latch 7 consists of a shaft, to which latch 7 is pinned, and also pinned on this shaft 8 is an arm 9 carrying the roller 10,'the roller 10 and arm 9 being positioned so as to swing into and out of the path of movement of a cam or track 11 carried by the car 2. When the lever 9 and roller 10 are in the position shown in Fig. 3,

the door is unlocked and cam 11 passes up and down the hatchway with the car without striking the rollers 10. Mountedloosely on the shaft 8 is a cam 12 (Fig. 7) having the inclined surface 13, and the flat surface 1 1,

and connected through a spiral spring 15 with the shaft 8 or the latch 7. 16is'a stud 18 in which the shaft 8 is mounted and tending normally to hold the roller 10 and the latch7 in the position shown in Fig. 3. In Fig. 3, the normal closed position of the door is shown, wherein the keeper 6 is some distance below the lower end of the latch 7 and the roller 10 is out of the path of movement of the cam 11. Also in this position, the cam surface 13 rests on the stud or roller 16. If the door is pushed upward, the effect is to cause the stud 16 to ride up on the cam 12 to the flat portion 14, thereby throwing the parts into the position shown in Fig. 2, spring 15 being strong enough to overcome spring 17. The door is thus locked against further upward movement because of the latch 7 coming into the path of the keeper 6, while the arm 9 and roller 10 are thrown outward to the position shown in Fig. 4. It will thus be seen that the door is looked as soon as the attendant commences to move it upward. If, however, the cam 11 is opposite the roller 10, it will be seen that the latch 7 will not be thrown into the path of the keeper 6, so that the door can be opened, the stud 16 moving away from the cam 12 and the keeper 6 passing over the cam 12 both during the opening movement of the door and the closing movement. 19 represents an adjustable stop mounted on the end of shaft 8 which can be set to regulate the throw of spring 17, for the purpose of setting the roller 10 the proper distance from the vertical path of cam ll, as shown in Fig. 2. The cam 12 has a certain amount of lost motion between it and latch 7, before it operates latch 7, this being provided-for by the teeth 22, 23 which are cut away to the de sired extent.

Having thus described my invention, I declare that what I claim as new and desire to secure by Letters Patent is 1. The combination with an elevator door, of normally unlocked locking means actuated to locking position by opening movement of the door, and means for holding said means unlocked. when the elevator car is at said door.

2. The combination with an elevator car, of a door, normally inoperative means controlled by the door for locking the door against full opening while permitting a limited movement thereof, and means carried by the car for holding said locking means inoperative.

3. The combination with an elevator car, of a normally free door, means for locking the door upon opening movement thereof, and means carried by the car for holding said locking means inoperative when the door is opened.

4. The combination with, an elevator car, of a normally free door, a keeper carried by said door, a latch controlled by opening movement of'said door to engage said keeper to lock the door, and means carried by the car for preventing engagement of said keeper and said latch.

5. The combination with an elevator car,

. of a normally free door, locking means opthe door and the other .to the casement and being normally disengaged, means for throwing the latch into the keeper upon movement of the door, and means independent of the door for holding the latch out of the keeper when the door is to be opened.

7. A door locking mechanism comprising a keeper, and a'latch, one being attached to the door and the other to the easement and being normally disengaged, means for throwing the latch into the keeper upon movement of the door, and means controlled by a movable oar opposit the door for holding the latch out of the keeper when the door is to r be opened.

8. The combination with a car, of a door, means controlled by movement of the. door for looking it against opening, and means carried by the car for rendering said locking means lnoperative.

9. A door locking mechanism comprising a keeper, and a latch, one being attached to the door and the other to the easement, a spring normally holding the latch out of engagement with the keeper, means operated by the door for throwing the latch into the keeper against said spring, and a spring connectmg said means with the latch and stronger than said first spring.

10. A door locking mechanism comprising a keeper, and a latch, one being attached to the door and the other to the casement and be ng normally disengaged, a rock shaft carrying said latch, an arm carried by said rock shaft, a car having means for limiting move ment of said latch toward the keeper, and

ing a keeper, and a latch, one being attached yielding connection between said means and to the door and the other to the easement, the latch. 10 and being normally disengaged, means oper- In testimony whereof I aflix my signature ated by movement of the door from closed in presence of two witnesses.

position for throwing the latch into the EDWARD L; DUNN. keeper to stop the door, means engageable Witnesses:

with an elevator car for preventing throw- H. C. EGAN,

ing of the latch into the keeper, and a G. N. KERR.

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

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