US1598678A - Elevator-door lock - Google Patents

Description

Sept. 7 1926. 1,598,678

l J.` DUNLOP ELEvAToR Doon Loan Filed August 16) 1924 2.SheetS-She0t 1 Imm/nio?? sqm 7 ,1926.

1,598,678 J. DuNLoP ELEVATOR DOOR LOCK Filed August 16. 1924 2 Shee'ts-Sheet 2 Patented Sept. 7, 1926.

UNITED STATES PATENT OFFICE.

JAMES DUNLOP, OF CHICAGO, ILLINOIS, ASSIGNOR TO KAESTNER &; HBCI-IT COMPANY,

F CHICAGO, ILLINOIS, .A CORPORATION OF ILLINOIS.

ELEVATOR-DOOR LOCK.

Application filed August 16, 1924. Serial No. 732,398.

My invention relates to improvements in elevator door locks, and more specically to door loclrs controlled by cam means on the elevator cage.

One of the objects of my invention is to provide a door lock with a mechanical means for actuating the locking member to release the door catch, said means being operable when the cage is at the landing but being incapable of actually moving the locking member unless an attempt to open the door is made.

Another object isto provide a novel elevator door lock comprising a latch operating means which is adapted to be automatically actuated by a cam on the elevator cage to store up energy for raising the latch, but the action of which is suspended when the door is completely closed.

more detailed object is to provide a Hexible latch operating means having a spring which is adapted to be deflected by one member, and with the energy thus obtained to actuate another member.

Ancillary objects and advantages will become apparent as the description proceeds.

In the accompanying drawings, Figure 1 is a front view of a door lock constructed in accordance with my invention, one of the cover plates being removed to show the interior.

Fig. 2 is a view showing a slightly different assembly of parts.

Fig. 3 is a section-al view taken along line 3 3 of Fig. l.

F ig. 4 is a lett side view of a lock shown in Fig. 2 with the door catch withdrawn.

Fig. 5 is a diagrammatic representation of a simple electrical elevator illustrating the use or' the lock.

IVhile my y invention is susceptible of various modifications and alternative constructions, I have shown in the drawings and will herein describe in detail the preferred embodiment, but it Vis to be understood that I do not thereby intend to limit the invention to the specie construction disclosed but aim in the appended claims to cover all forms falling within the spirit and scope of the invention.

Referring to the exemplary embodiment illustrated in the drawings, designates a suitable casing for the door lock which preferably consists oit a hollow rectangular trame-11. rIlle opposite sides of the frame 11 are connected by two parallel spaced webs 12, and the front and rear faces are closed by removable cover plates 13. One side of the trame 11 is formed with an opening 14 adapted to receive the catch 15 on the door 16.

lhile any suitable means can be employed to secure the casing 10 to the hatchway 17, I prefer to use bolts 18 which extend through bores 19 in the corners of the trame 11. The cover plates 13 are similar' but right and left hand in construction, and the bores 19 are beveled at both ends to permit reversal of the casing 10 for doors 16 opening to the right and lett.

Removably mounted on a pin 20 and between two spaced lugs 21 extending inwardly from one side oli the frame 11 is a pivotal locking member or latch 22 having a 'hook 23 at its i'reeend adapted to engage and retain the catch 15 when the door 16 is closed. A pair of plugs 24 are removably threaded into tapped bores 25 in the lugs 21, and support the opposite ends of the pin 20. To permit removal of the plugs, the cover plates 13 are cut away at 26.

The rear end ot the latch 22 is formed integral with an arm 27 extending downwardly from the pivot into a position to be engaged by the forward end of the catch 15 when the door 16 is closed. Upon being thus engaged., the arm 27 will move the hook 23'into locking engagement with the catch 15, and hold the same against upward movement until the catch l5 is slightly withdrawn Las shown in Fig. 1. Downward movement of the latch 22 is arrested by a pair of lateral extensions 28 projecting toward each other from the cover plates 13. The latch 22 can be manually raised to release the catch 15 by means of a pin 29 removably secured to either side of the latch and projecting through a suitable aperture 30 in either one or the cover Vplates 13, depending on which one is exposed.

Means is provided for raising the latch 21. In the present instance, this means is mechanically controlled, but a lock of similar construction automaticallyV having an electrically controlled latch operating means is fully disclosed and covered in my copending application, Serial No. 732,399 filed August 16, 1924. Referring to Figs. 1 and 2, a ball or cam roller 31 is rotatably mounted on the pivoted end of the latch 22, and is positioned between the 'forked arms `of a cam member 32 adjustably mounted on a spindle 33. One end of the spindle 33 is journaled in one side ot the trame 11, and the other end extends out or' the casing 1() through an elongated sleeve or support 34 threaded into the other side of the frame 11. Loosely mounted on Vthe outer end ot the spindle 33 is a lever 35, the pivotal end of which is forked and the tree end of which carries a cam roller 36 adapted to be engaged by a cam 37 on the cage 38 when the latter is at one of the landings 39. Rigidly but adjustably mounted on the spindle 33 between the forks on the lever is a dog 40. A suitable leaf spring 41 secured to the lever 35 extends into overlapping engagement with the 'free end oi' the dog 40, and tends to oscillate the latter when the roller 36 is engaged by the cam 37. It will be seen that the dog 40`will raise'the latch 22 upon being oscillated in either direction from a central position, and that the casing 10 can be reversed without atfecting the operation of' the lock if the roller lever 35 is likewise reversed or rotatably adjusted with the dogl 40 through 180o. Upward movement of the` latch 22 is opposed by the mass of the door 16 acting through the arm 27. prevent unlatching of the door 16 until an attempt to open the latter is made, the spring 41 is designed with sutficient strength when flexed to raise the latch 22 against its own `weight but not to move the catch 15 outwardly. p

The latch operating means Vis susceptible of being assembled with the lock in a number ot' ways to adaptthe latter to dii. Aferent. elevator installations. Thus the lever 35 and dog 40 can be rotatably adjusted on the spindle 33 to properly locate the roller 36 for different positions ot the cam 37 on the cage 38. The spindle 33 can also be associated with the latch 22 in any other suitable way than that shown in Fig. 1.` For example, in the form sho-wn in Fig.

2, yone of the plugs 24 is replaced by the sleeve 34, and the spindle 33 is substituted for the pin 20 to support the latch 22. n

Means is provided for preventing movement of the cage' 38 away from the landing when the door 16 is open or unlatched.

This means comprises a pair of rocker arms 42 and 43 made of insulating material and mounted vbetween the webs 12' on pivot pins 44. The upper end of the rocker'arm 42 is formed with a cam portion 45 adapted to be engaged and depressed by the door catch 15 as the latter enters the casing 10. The upper end of the arm 43 is provided with a projection 46 fitting loosely into a notch 47 in the lower end ot the arm 27. A pair ot contact strips 48 are mounted on adjacent sides o't the rocker arms., and are electrically connected by a coil spring 49. lemovably mounted in a pair o1 notches 50 formed in opposite sides of the frame 11 is an insulating board 51 which supports a pair of spring contacts 52 positioned to be engaged by the contact strips 48. Undue iiexing 0I the spring contacts 52 beyond their elastic limit, as by a manual depression or' the cam portionl 45 or latch 22, Vis prevented by a pair ot' upstanding lugs 53 formed integral with theplate 51. l

The contactstrips 48 and the spring contacts 52 constitute a .pair of switches 54 and 55' which Aare connected in series and are adapted to form part of one of the elevator' circuits controlling the movement of the cage 38. It will be seen that upon closing and Vlatching the door both switches will. be closed, and that upon subsequently disengagingthe cam roller 36 the door 16 will be locked. Vhen the door is open and the latchy 22 is raised, both switches willbe open; when the door is closed and the latch is raised, switch 55 will be open, and when the door is open andthe latch is down, as for example, it the spring 41 became defective, switch 54 will be open to prevent in each instance` a closure y or' the circuit through the switches. 1 l

Referring to Fig. 5, I have shown the lock as forming part of a simple yelevator system, but it is to be understood that `it can be connected in many other systems in any other suitable manner. In thev present elevator system, theV driving motor for the cage 38 is represented by 56, and the up and down directional switches torV controlling the operation of the motor by 57 and 58 respectively. These switches are adapted yto be actuated by means of a car switch 59 having a suitable control lever 60.

To actuatethe switch 57, thejlever 6,0 is moved tothe left thereby closing the jfollowing circuitztrom the plus main 61, through wire 62, lever Y60, segmental contact 63, wire 64, coil 65, and wire' 66 including the switches54. and 55 tothe minus main 67 of theline. The doors 16 must be closed so that the switches 54 and 55 are closed.

Closure of the switch,y 57, kcloses a circuit ythrough the motor armature as follows:

from the wire62, through the lever` 60, variable-resistance 68, wire 69, switch contacts 70, wire-71, motor armature, wire 72,

switch contacts73and wire 74 to the minus main- 67. The field 75 of themotor vis connected directly across the main lines by wires 62and 7 4. The speedoflthe motor lever 60, segmental contact 76, wire 77, coil 78, and wire 66 including the switches 54 and 55 to the minus main. Operation of the switch 58 closes a circuit through the motor armature reverse to the foregoing.

circuit closed by the switch 57, and as follows: from the wire 62, through the lever 60, resistance 68, wire 69, switch contacts 79, wire 7 2, motor armature, wire'71, switch contacts 80, and wire 74 to the minus main.

'Ihe switches 54 and 55 of each door lock in the hatchway 17 are connected in series in the wire 66, and hence control the operation of the directional switches. If the cage 38 is at the landing, the cam 37 will engage the roller 36 to flex the spring 41 and the door 16 will be unlocked. Since the energy in the spring 41 is insufficient to overcome the mass of the door 16, movement of the dog 40 will be suspended until the arm 27 is released by the withdrawal of the door catch 15 against the hook 23. Further movement of the cage 38 is prevented until the door 16 is closed and latehed.

It will be seen that I have provided a door lock simple in construction and operation, capable of being assembled and mounted in different ways for different elevators, and eliicient and safe in use. While I have shown the easing 10 as secured to the hatchway 17, and the catch 15 to the door 16, it is contemplated that these parts can readily be reversed without affecting the operation of the lock.

I claim as my invention:

1. An elevator door lock having, in combination, a casing, a door catch, a latch in the form of a bell crank one arm of which is provided with a hook to engage said catch and the other arm of which is positioned to be engaged by said catch, the space between said hook and said last mentioned arm being sufficient to allow a. limited movement of said catch without raising said latch, and mechanically controlled means for automatically raising said latch, said means being ineffectual when said catch engages said last mentioned arm.

2. An elevator door lock having, in combination, a casing, a door catch, a latch in said casing, and mechanical means positioned for engagement by the cage for automatically raising said latch when the cage is at the landing but being ineffectual until an attempt to open the door is made.

3. An elevator door lock having, in combination, a casing, a door catch, a latch in said casing mounted to engage said catch and to be held thereby in engagement therewith when the door is completely closed, and spring means rendered operable when the cage is at the landing to automatically raise said latch, said means being inell'lectual amil said catch is partially withdrawn.

4. An elevator door lock having, in combination, a casing, a door catch, a latch pivotally mounted in said casing and having a depending arm adapted to be engaged by said catch, a spindle mounted in said casing, cam means on said spindle operatively associated with said latch to raise the latter, a lever loosely mounted on said spindle and having a cam roller, a dog rigidly. secured te said spindle, spring means carried by said lever vand extending into overlapping engagement with said dog to resiliently actuate the .latter, and cam means mounted on the cage in a posit-ion to engage said roller as said cage moves to the landing, said spring means being incapable upon oscillation of said lever of oscillating said dog to raise said latch until said depending arm i's disengaged by said catch.

5. An elevator 'door lock having, in combination, a casing, a door catch, a locking member in said casing for engaging said catch and construct-ed to be held in locking position by the latter, and mechanically operated means rendered operable when the cage is at the landing but being ino'lfectual to move said member except after or simultaneously with an attempt to open the door.

6. A door lock having, in combination, a casing, a door catch, a latch in said casing, a cam roller on said latch, a spindle, cam means on said spindle positioned to'engage said roller upon movement in either direction, and cam actuated means for rotating said spindle.

7. An elevator door lock having, in combination, a door catch, a latch for engaging said catch, a spindle operatively associated with said latch to raise the latter upon being rotated, spring means for rotating said spindle, and cam means positioned on the cage to actuate said spring means when the cage is atthe landing.

8. An elevator door lock having, in combination, a door catch, a latch `for engaging said catch, a spindle operatively associated with said latch to raise the latter upon being rotated, a lever having a forked end loosely mounted on said spindle and being provided with a cam roller at its other end, a dog rigidly secured to said spindle between the forks of said lever, a spring tending to move said dog and said lever simultaneously and means for engaging said roller when the cage is at the landing to osJillate said lever. l

9. In an elevator door lock having a catch and a latch for engaging said catch, a latch operating means comprising, in combination, a spindle adapted to be associated with s-aid lateh to disengage the latter from said cat-h upon being rotated, a member loosely mountd on said spindle, a second member 'rigidlyv secured to said spindle, and a spring tending to oseillate said members simultaneously when said first member is'oseillated in one direction. Y Y y l0. An elevator door lock having, in combination, a doorl catch, a looking member for engaging said catch, a spindle operatively associated with said loeking'member to dis engage the latter', a member loosely mounted on said spindle, a second member rigidly mounted on said spindle, spring means tend,-

15 ing to prevent independent oscillation Y of said'members,Y and 'means acting to oseillate ysaid first ymentioned member when the page is at the landing. f

v'11. Inanielevatordoor lock, in co1nbinatio'n, a support, a lever loosely mounted on said support, a second lever mounted onvsaid support next to saidv irst mentioned lever, and a lea` spring secured at one end to one of said levers and engaging the other of said leversiwith its free end. saidl leaf spring tending to prevent independent movement of saidvlevers 1n one dlreetion.

In testimon whereof I have hereunto af- Y a v fixed my signature.

JAMES DUNLOP. K

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