US1388713A - Lock - Google Patents

Description

C. HOFFMAN.

LOCK.

AFPLICATIGN FlLED JULY 16, 1920.

PatentedAug. 23, 1921.

Caf /foflgmamr/V w1, we fw UNITED STATES PATENT oFFlcE. i

LOCK.

Application ined July 1s,

To all whom tmay concern:

Be it known that I, CARL HOFFMAN, of

"Allentown, in kthe `county of Lehigh and State of Pennsylvania, have invented certain new and useful Improvements in Locks; and I do hereby declare the following to be 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.

My invention relates to locks and is of the type where the locking and latching functions are effected by a single member on the door cooperating withV a keeper on the door casing. The object of my invention is to provide a simple and highly eilicient lock with but a minimum number of parts which are so arranged that the lock-latch is readily operable from inside and outside the door by means of a handled spindle; may be locked on the inside to, prevent manipulation `from without; may be locked from outside by means ofV a key which sets a control mechanism so that the lock-latch may not bemoved save by an appropriate key which must first be turned to dislodge a stop from locking engagement with `the lock-latch lever and then be brought into engagement with a tumbler controlled actuating slide by whichthe lever` is moved to retract the lock-latch. y

`In the drawings, Figure lis a view in perspective oi' a portion of the door, viewed from the inside, with my improved lock applied thereto. Fig. 2 is an elevation with one of the casing plates removed to `show the operating mechanism. Fig. 3 is a detail showing the key cylinder and the `bit end of the key. Fig. 4 is a side elevation of a portion of the operatingr lever.

While m improved lock is applicable to any door Iyhave designed it primarily for use with store doors. A casing 1 with the usual edgeand side plates is mortised in a door and is provided with necessary openings for theprojection of the lock-latch 2 and for access to the control mechanism by means of a handle and a key. The lock latch has an inwardly extending portion 3 with a projecting stud 4 with which a hooklike finger 5 of an operating lever 6 is designed to have sliding engagement to retract the loclrlatch against the tension of its spring 7. `This lever is of peculiar forma tion. It has tWO arms 8 and 9, the latter Specification of Letters Patent.

Patented Allg. 23, 1921. 192e. serial No. 396,697.

being longer than thearm 8, the pivotal connection of the lever with the casing being at the extreme endof the arm 9, as indicated at 10. A cut-out 12 in the arm 9 is adapted to receive a stop block 13 'which when moved into this cut-out effectively prevents any movement of the lever. The stop block has talons 14, 15,` with which the bit of a key is designed to engage to raise and lower thestop block, the *latter being heldin either of its two positions by a spring held tumbler 17 which is in locked engagement with the block, it being neces sary to first move the tumbler bei-ore the stop block can be actuated. A winged spindle 18 operable by appropriate handles 19 on the inside and outside of the door is one meansfor turning the lever 6 to retract the lock-latch, the wings 2() of the spindle engaging the arm 9, as shown in Fig. 2. The arm 8 at `its extreme end carries a hinged plate 21 which forms a continuation of the arm. To this plate is secured a lever 22 which is bent so as to lie in spaced parallelism with the arm 8, a spring 23 i1i-` terposed4 between the lever and arm normally maintaining the plate 21 in the same plane with the arm 8. A projection 24 on the lever extends `laterally into a semi-cir cular recess 25 oi the lever 6 and when moved longitudinally of the recess will rock the plate 21 and cause it to asume a slightly slanting position relative to the arm 8 so that in this deflected position of the plate as indicated in dotted lines, Fig 4, a tumbler actuated slide, to be hereinafter described, cannot operatively engage the plate. For the purpose of moving the lever 22 as just described I employ `a stop pin 26 fricw tionally held in the lock case and operable from inside the door. This stop pin when moved inward Iirst presses on the projection 24 oi the lever 22 and then takes in the recess l25 effectively locking' the lever 6 against movement. This stop pin may also be employed to hold the lock-latch permanently retracted, the pin taking` in a recess 27 of the lock-latch for this purpose.

against movement in either direction by Ytumblers 33, Vthe spring 7 which cooperates withy the lock Vlatchservingto tension these tumblers.

A cylinder 35fhaving a longitudinal slot V36, extending part kway through the cylinder Y forms the guide for the key 16. At its ini ner end this cylinder carries a hinged finlof the lever 6 andturn theglever. oni-its for actuating a signal to indicate `opening i ofthe door. I have vshown such a connection. in Fig. 2, a bell being 'indicated at 40,

theextensionof the-"leverat 4:1, andrsuit l able gearing at 42. f

In theuse ofy my improved lock, and assuming the parts to be in the position shown in Fig. 2, turning ofthe spindle 18 from either inside or outside the door will cause one. of the-wings 20fto engage the Yarm IVO causing -a retraction of the lockatch V,through engagement of the linger 5 with the stud This lmovement is also effective to soundrthe bell throu li the mechanism shown for that purpose. f it be desired to hold the lock-,latch in retracted position -it is only necessary to withdraw it from engagement with its keeper by means of the handle, as suggested, and to pushV in on the stol 26so that it will take in the recess 2 and hoild the lock-latch.l against the tension of its spring.- With thel parts in operable posi- 1 tion,'if it is desiredY to secure the lock-latch against manipulation from without the cyl- .inder must first be turned so that its slot 36'is at the bottom. The key is then inserted andturned so that itsbit will engage the tumbler 17 to remove it from locking Vengagementwith the stop block 13, further turnin of the `key bringing the bit into contact with the talons of the stop block'tomove it up into the cut-out 12 ofthe arm 9. The key is then withdrawmfbut before it is entlrely'removed from the cylinder it may be given aturnto place the slot of the cylindergin reverse of the'correct position for operation of the lock. vTorelease the lock- Vlatch from the outside by means of theV key,

the cylinder 35 must be positioned with its lslot at the top, the key inserted and turned so as to move. the tumbler-17 and the fstop block 13,the latter from engagement with the 'leverv6, continued turningvof the key then bringing its bit into :engagement with thetuniblers 33 for unlocking the slide 30 aIidthenf-moving theslide to contapt with Y secures the lever` 6 against movement.

pin

the plate 21 which causes the turiiin of the leverV 6 and retraction of the loc latch. Locking of the parts from within so as t0 prevent any. manipulation from without either by the handle or key is effected by pressing inwardly on the stop pin 26 Whic not only removes the plate 21 from position to be engaged by the slide 30 but alo t will be appreciated that even though a key or other instrument may be inserted and the tumbler actuated slide 30 moved its movement is ineffective since the plate 21 is deflected from the path of the slide 30. Additional security may be given b turni cylinder 35 and fastening its nger-ho d 37 on the stud 38.

yI claim as my invention:

1. In a lock, a tensioned lock-latch, an actuating lever therefor, a handled spindle for operating said lever, tumbler controlled means for engaging .and moving said lever to retract said lock-latch, and a tumbler controlled means for locking said lever against movement, in combination with a key for Yeffecting movement of each of said last mentioned means.

2. In a lock, a tensioned lock-latch, an

.actuating levertherefor, a handled spindle 'Y and said tumbler controlled slide.

3. In a lock, a tensioned lock-latch, an actuating lever therefor having a hin portion, a handled spindle for o rating said lever, a tumbler controlled side for engaging the hinged portion of said lever to retract said lock-latch, means for moving said Yhinged portion of the lever from the .path of said slide, and a tumbler controlled stop forY locking said lever against movement, in combination with a key for actuating1 said stop and said tumbler controlled sli e;

4. In a lock, a tensionedv lock-latch, an actuating lever therefor, having a hinged portion, a handled spindle for operating said lever, a tumbler controlled slide for engaging the hinged portion of said lever to retract saidlock-latch, a stop pinfor moving vsaid hinged portion of the lever from Vthe pathof said slide, and a tumbler controlled `stop block for locking said lever against movement, in combination with a key for'actuating said stopblock and Said tumbler controlled slide.

5. In a lock, a casing, atensoned locklatch, an actuating lever therefor having a.

pair of arms, one of said varms having a hinged portion, and the otherof said arms the lever and in part by the casing of the lock 10 for movin said hinged portion from the Eath of said slide, in combination with a ey for actuating said stop block and said tumbler controlled slide.

In testimony whereof I have signed this 15 specification.

CARL HOFFMAN.

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