US3895505A

US3895505A - Door lock

Info

Publication number: US3895505A
Application number: US483686A
Authority: US
Inventors: Georg Wasserfaller
Original assignee: Individual
Current assignee: Individual
Priority date: 1973-06-29
Filing date: 1974-06-27
Publication date: 1975-07-22
Anticipated expiration: 1992-07-22
Also published as: ATA578973A; JPS5817872B2; JPS5036300A; FR2235253A1; IT1014436B; AT328912B; FR2235253B3; CH564669A5

Abstract

A door lock has a latch and a bolt reciprocal between open and locked positions and a key-operated lock cylinder for reciprocating the bolt between these positions. A locking bolt may be depressed into a latch engaging position for holding the latch in the locked position, and a train of levers is interposed between the reciprocal bolt and the movable locking bolt for lifting the depressed locking bolt out of engagement with the latch in response to the key-operated rotation of the lock cylinder to permit opening of the latch.

Description

United States Patent [191 Wasserfaller July 22, 1975 [5 DOOR LOCK Primary ExaminerAlbert G. Craig, Jr. [76] Inventor: Georg Wasserfaller, 5923 Post Agent Kelma" Landskron, Gratschach, Austria 22 Filed: June 27, 1974 [57] ABSTRACT A door lock has a latch and a bolt reciprocal between [21] Appl' 483686 open and locked positions and a key-operated lock 30 A P D cylinder for reciprocating the bolt between these posi- Forelgn pphcatlfm nomy ata tions. A locking bolt may be depressed into a latch en- June 29, AUStI'la position for the latch in t o ed po 52 US. CL... 70 111- 292 150 sition and a of levers interPOsed between the E Int Cl E65) 5/9/00 reciprocal bolt and the movable locking bolt for lifting [58] Field 70/1 1 1 the depressed locking bolt out of engagement with the I l I I I I latch in response to the key-operated rotation of the [56] References Cited lock cylinder to permit opening of the latch.

UNITED STATES PATENTS 7 Claims, 2 Drawing Figures 1,071,266 l0/l9l3 Schwieger 70/1 ll 'I i 15 A 6 15 1 e c 1 1- ,1

he. '1 l l 10 I 16 11 II 21 z ,..J 37

za I f; F 22. L" 11'- za noon LOCK The present invention relates to improvements in door locks, and more particularly to locks which comprise a latch reciprocal between an open and locked position. a bolt reciprocal between an open and locked position, key-operable means for reciprocating the bolt between the locked and open position. and a locking mechanism including a locking bolt movable between a latch engaging position for holding the latch in the locked position and a position wherein the locking bolt is disengaged from the latch for permitting the latch to be reciprocated into the open position.

Door locks of this type have been used widely for the doors of hotel rooms, for instance, and a specific application thereof has been disclosed in Austrian Pat. No. 297,869. In such locks, it is important that the door may be locked from the inside independently of the locking by the locking mechanism of the depressable locking bolt.

It is the primary object of this invention to provide a lock which may be opened from the outside by a key even if the door has been locked from the inside by the locking mechanism, i.e. by depressing the locking bolt to keep the latch in its locked position.

The above and other objects are accomplished in accordance with the invention by providing lever means operably associated with the reciprocal bolt and the movably locking bolt for moving the locking bolt into the disengaged position in response to the key-operated reciprocation of the bolt into the open position thereof. The locking bolt is mounted for movement under pressure in a direction transverse to the direction of reciprocation of the latch.

According to a preferred embodiment, an unlocking lever is mounted for pivoting in response to the keyoperated reciprocation of the reciprocal bolt and the unlocking lever has an end pressing against an end of the locking bolt in response to the reciprocation, the unlocking lever end is preferably beveled.

Preferably, an intermediate lever is arranged for pivoting in response to the key-operated reciprocation of the reciprocal bolt and the unlocking lever is arranged to be pivoted by pivoting of the intermediate lever to press the end of the unlocking lever against the end of the locking bolt. The intermediate lever has a lug for engagement with recesses in the reciprocal bolt.

The above and other objects, advantages and features of the present invention will become more apparent from the following detailed description of a now preferred embodiment, taken in conjunction with the accompanying drawing wherein FIG. 1 is a plan view of the door lock according to the preferred embodiment of this invention, with the cover plate removed to illustrate the lock mechanism, and

FIG. 2 is a partial section ofa detail of the lock along line Il-II of FIG. 1.

Referring now to the drawing, the lock is housed in case 1 conventionally comprised of bottom plate or apron 2, a cover plate (not shown) and side wall 3, the lock case being affixed to the door. Latch 4 is mounted in the case, with its tail end 4a defining notch 5 which receives nose or catch 6 of locking member 7 which is rotatable by a door knob (not shown) in the direction of arrow B in a manner to be described hereinbelow. Latch 4 is guided for reciprocation in a direction transverse to the axis of rotation of the door knob and member 7 by pin 8 engaging longitudinal slot 9 in latch portion 4a. A spring 10 is mounted in the case and biases latch 4 counter to the direction of arrow A, the illustrated spring being a spiral spring having one end affixed to the bottom plate of the case and a free end engaged in a recess in the latch.

Locking mechanism 14 (more fully shown in FIG. 2) is threadedly mounted in bottom plate 2 and comprises locking bolt which may be pressed inwardly into the lock case. As shown, the locking mechanism comprises a housing having an axial bore slidably receiving the bolt. A retaining ball is held in an annular groove in the locking mechanism housing and is inwardly biased into resilient engagement a respective one of two annular grooves in the periphery of'the bolt. Under spring pressure exerted upon the retaining ball, the locking bolt will be held in its two respective operating positions. the ball yielding under axial pressure upon the bolt but snapping into an aligned annular bolt groove when this pressure ceases.

When locking bolt 15 is depressed into case 1. its end 15a engages the rear end of latch 4-so that the latch cannot be moved in the direction of arrow A against the bias of spring 10. Thus, catch 6 of locking member 7 is held in fixed position and prevents rotation of the locking member and the door knob in the direction of arrow B.

The lock also comprises bolt 11 having portion 12 extending into case 1 and defining recesses 13 in the underside of bolt portion 12. The bolt recesses are arranged to cooperate with, and be engaged by, cam or dog 34 of lock cylinder 35.

An unlocking lever 17 is mounted in case 1 for pivoting about fulcrum 16, one end 18 of the lever being in engagement with locking bolt 15. Lever portion 19 which engages bolt end 15a is bevelled.

Intermediate lever 21 is mounted in case 1 between bolt 11 and unlocking lever 17, lever 21 being pivotal about fulcrum 20. Lever 21 has extension 22 forming knee 36 with the lever, the outer end of lever extension 22 having a guide or camming surface 23. Except for the arched portion 24, intermediate lever 21 is mounted in a plane below the plane of bolt 11. The arched lever portion has lug 25 arranged to be engaged in recesses 26 in the upper side of bolt 11.

The above-described lock is operated in the following manner:

The door is securely locked when locking bolt 15 has been depressed. When it is desired to unlock the door, a key (not shown) is inserted in the keyhole of lock cylinder 35 and the latter is rotated in the direction of arrow E. This rotation causes cam 34 to enter and engage rearward recess 13 of bolt 11. At the same time, cam 34 will engage camming surface 23 of lever 21 to lift the same into the position shown in broken lines and to pivot it in the direction of arrow D while sliding bolt 11 inwardly in the direction of arrow F, lug 25 having been lifted out of engagement with recess 26. The lifting and pivoting of intermediate lever 21 will cause its knee 36 to move into engagement with cam 37 of unlocking lever 17. This will pivot lever 17 about fulcrum 16 into the position shown in broken lines, causing beveled end 19 at the opposite end 18 of the lever to press against inner end 15a of locking bolt 15, thus pressing the bolt outwardly and disengaging its end 15a from the rear end of latch 4. This frees the latch for guided movement in the direction of arrow A by rotation of the door knob in the direction of arrow B. Bolt 11 having been opened by operation of the lock cylinder. latch 4 may now also be opened by operation of the door knob. and the door may be opened.

What is claimed is: l. A door lock comprising. in combination: I. a latch reciprocal between an open and locked posltron. 2. a bolt reciprocal between an open and locked position, 3. key operable means for reciprocating the bolt between the locked and open position. I 4. a locking mechanism including a locking bolt movable between a latch engaging position for holding the latch in the locked position and a latch disengaging position wherein the locking bolt is disengaged from a latch for permitting the latch to be reeiprocated into the open position, and 5. means operably associated with the reciprocal bolt and the movable locking bolt for moving the locking bolt into the disengaged position in response to the key-operated reciprocation of the bolt into the open position thereof. 2. The door lock of claim 1, wherein the locking bolt is mounted for movement under pressure in a direction transverse to the direction of reciprocation of the latch.

3. The door lock of claim 2, wherein the means operably associated with the locking bolt comprises an unlocking lever mounted for pivoting in response to the key-operated reciprocation of the reciprocal bolt, the unlocking lever having an end pressing against an end of the locking bolt in response to the reciprocation.

4. The door lock of claim 3, wherein the unlocking lever end is beveled 5. The door lock of claim 2, wherein the means operably associated with the reciprocal bolt comprises an intermediate lever. mounted between the reciprocal bolt and the unlocking lever. the intermediate lever being arranged for pivoting in response to the keyop'erated reciprocation of the reciprocal bolt and the unlocking lever being arranged to be pivoted by pivoting of the intermediate lever to press the end of the unlocking lever against the end of the locking bolt.

6. The door lock of claim 5, wherein the keyoperable means comprises a lock cylinder and a cam movable by the lock cylinder into a recess in the reciprocal bolt for reciprocation thereof.

7. The door lock of claim 5, wherein the intermediate lever has a lug for engagement with recesses in the reciprocal bolt.

Claims

1. A door lock comprising, in combination:

1. A latch reciprocal between an open and locked position, 2. a bolt reciprocal between an open and locked position, 3. key-operable means for reciprocating the bolt between the locked and open position, 4. a locking mechanism including a locking bolt movable between a latch engaging position for holding the latch in the locked position and a latch disengaging position wherein the locking bolt is disengaged from a latch for permitting the latch to be reciprocated into the open position, and 5. means operably associated with the reciprocal bolt and the movable locking bolt for moving the locking bolt into the disengaged position in response to the key-operated reciprocation of the bolt into the open position thereof.

2. a bolt reciprocal between an open and locked position,

2. The door lock of claim 1, wherein the locking bolt is mounted for movement under pressure in a direction transverse to the direction of reciprocation of the latch.

3. key-operable means for reciprocating the bolt between the locked and open position,

4. a locking mechanism including a locking bolt movable between a latch engaging position for holding the latch in the locked position and a latch disengaging position wherein the locking bolt is disengaged from a latch for permitting the latch to be reciprocated into the open position, and

4. The door lock of claim 3, wherein the unlocking lever end is beveled.

5. The door lock of claim 2, wherein the means operably associated with the reciprocal bolt comprises an intermediate lever mounted between the reciprocal bolt and the unlocking lever, the intermediate lever being arranged for pivoting in response to the key-operated reciprocation of the reciprocal bolt and the unlocking lever being arranged to be pivoted by pivoting of the intermediate lever to press the end of the unlocking lever against the end of the locking bolt.

5. means operably associated with the reciprocal bolt and the movable locking bolt for moving the locking bolt into the disengaged position in response to the key-operated reciprocation of the bolt into the open position thereof.

6. The door lock of claim 5, wherein the key-operable means comprises a lock cylinder and a cam movable by the lock cylinder into a recess in the reciprocal bolt for reciprocation thereof.