US1526110A - Lock for cabinet doors and the like - Google Patents

Description

Feb. 10. 1925. 1,526,110

' W. BACHMANN LOCK FOR CABINET DOORS AND THE LII-KE Filed Deo. 30, 1922 Patented Feb. 10, 1925.

` UNITED STATES .P'A'rialv'rV oFFIcE.

WILHELM BACHMANN, 0F ZURICH, SWITZERLAND.

LOCK FOR CABINET DGORS AND 'III-IE LIKE.

Application led December 30, 1922. Serial No. 610,007.

This invention relates to alock ot the kind having two bolts which are shot in 4opposite directions, and its object is to produceanon-obstructive lock which can be itted on cabinet doors or the like without recessing the same except as far as required 1 for the introduction ott the key.

This object is achieved by meansr'o't the invention which consists in the provision oi a shallow elongated Casing containing a rev" `oluble barrel, two spring-pressed bolt-operated slides, and two links which are pivoted to the barrel and which bear against the slides, `the latter being shot or retracted 'by halt a revolution of the barrel and retained, in one position by the overlapping of the links across the barrel and in the other position by the mutual abutment of the elements at a point of the movement beyond the dead centre of the links. Y

Fig. 1 of the accompanying drawings rep- `resentsa sectional view of a cabinet door to which the lock is attached,

Fig. 2, a view of the lock casing with the cover removed, y

Fig.` 3, a sectional view of the lock casing,

Fig. l1, a cross-section on the line A--A ot' Fig. 3,

Fig. 5, a cross-section on the line B-B of the same ligure, y

Fig. 6, a view of the key,

Fig. 7, a view of one of the guide plates,

Fig. 8, a; view of the interior of the lock showing thc bolt-operating slides in retracted position,

Fig. 9, a similar view showing the slides in shot position,

Fig. 10, an enlarged view of the revolu* ble barrel and its links, and

Fig. 11, a view at right angles to Fig. 10.

The lock casing is composed of an elongated plate l having raised edges 2 on which lits a cover 3. The latter carries a centrally disposed cylinder 7 which contains a rotatable guide block 9 for a fiat key 2O hav ing a handle 21. through a slot 8 in the block behind which there is a ward plate or a plurality of plates l0 through Slot-S l? (Fie- 4) inwhch the u n n `cesses 31 V1n which to accommodate two coil The key is admittedV key must pass. Each slot 12 has a central circular enlargement 11 allowing the key to turn when notches 22 in the key register with the plates. The inner end of the cylin der 7 receives the reducedportion 18 of a revoluble barrel 16, the latter being accom- -modated within the lock casing and guided therein by two plates 13 which conform with the shape o1 the casing, each plate having a central aperture 17 in which to receive the barrel. There is in the portion 18 ot the barrel a diametral slit 19 into which the key 20 is admitted for turning the barrel. This slot is flared radially outwards so as to allow a slight movement of the key relative to the barrel. Thus, without operating the lock mechanism, the key can be engaged to the ward plate or plates 10 and serve as a handle for opening and shutting the door.

Between the plates 18 two slides 28 are arranged, one at each end of the lock casn The plates 13 are formed with resprings 30, each spring being adapted to bear with one end against a shoulder 29 on one of the slides 28 and with the other end against shoulders 82 on the plates 13. Thus the slides 28 will be urged by the springs Atowards the barrel 16. The latter is formed with two segmental, circumferential recesses 23 (Fig. 11) within each of which a link 25 is pivoted.` Each link has at one end a head 36, which receives the Vpivot pin 24 and at the other end a head 26 which is in pivotal engagement with the inner circular portion 27 of an otherwise triangular notch in one of the slides 28. The links conl trol the position of the slides. Fig. 8 shows the slide contracted; the links overlap across the barrel and no lurther contracting movement is possible.

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The slit 19 of the barrel 16 is in alignment with the key slot in the plate or plates 10 so that the key can be introduced for opening the lock. By a turn on the bai`- rel through o, the slides 28 will be shot.

In this position, which is shown in Fig. 9,

the slides will be retained by the links which, having passed the dead centre, tend to continue the movement of the barrel but are prevented from so doing by abutment against the edges-which conline the recesses in the slides and in the barrel.

The lock casing is held together by rivets 4f and is secured to the inner face of a cabinet door 6 or the like which is simply drilled,

to admit the cylinder 7. The fastening screws 5 and the rivets 4 pass through elongated slots l5 in the plates 13 and in the slides. Extensions 33 of the slides are admitted through slots le in the ends of the casing, and these extensions are connected by pivot pins 35 to bars 34 which operate the lock bolts, one at the top and the other at the bottom end of the door.

The different parts of the look can be stamped out ot sheet metal, and a very cheap and elicient lock will thus be obt-ained.

l claim l. A key-operated lock for cabinet doors and the like, comprising a shallow elongated casing, a centrally disposed cylinder projecting from said casing at right angles, a guide block for the key arranged rotatably within said cylinder, a revoluble barrel a-rranged within the casing, said barrel having a reduced portion projecting int-0 said cylinder :tor engagement with the key, two bolt-operating slides arranged within and at opposite ends of the casing, springs tending to urge the slides towards the barrel, and links pivoted eccent-rically to the barrel and supporting the slides so that the latter can be shot or retracted by half a revolution of the barrel, one end position of the barrel being determined by the overlapping 't the links across the barrel and the other end position by the abutment of the link flanks against the slides at a point of the movement beyond the dead center of the links.

2. A key-operated lock for cabinet doors and the like, comprising a shallow elongated casing, a centrally disposed cylinder projecting from said casing at right angles, a guide block for the key arranged rotatably within said cylinder, a slotted ward plate arranged in said cylinder so as to engage notches in the key when the latter is turned and prevent a withdrawal of the same,` a

revoluble barrel arranged within the casing, said barrel having a reduced portion projecting into said cylinder, said reduced portion being formed with a diametral slit for engagement with the key, said slit being shaped so as to allow a slight rotation of the key for engagement with said ward plate without afecting the barrel, two boltoperating slides arranged within and at opposite ends of the casing, springs tending to urge said slides towards the barrel, and links pivoted eccentrically to the barrel and supporting the slides so that the latter can be shot or retracted by half a revolution of the barrel, one end position ot tlie barrel being determined by the overlapping of the links across the barrel and the other end position by the abutment of the link flanks against the slides at a point ot the movement beyond the dead centre of the links.

3. A lock for cabinet doors and the like, comprising a shallow enlongated casing, two bolt-operating slides arranged inside and at opposite ends of said casing, springs tending to urge the slides towards the center of the casing, a key-operated revolnble barrel arranged between the ends of the slides in the center of the casing, and links pivoted eccentrically to the barrel and resting in notches in said slides so that the latter can be shot or retracted by half a revolution of the barrel, one end position of the barrel being determined by the overlapping of the links across the barrel and the other end position by the abutment of the links against the edges of the slide notches at a point of the movement beyond the dead center of the links.

VILHELM BACHMANN.

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