US1274477A - Lock. - Google Patents

Description

.l. T. WARNE.

LOCK.

APPLICATION FILED 001.24. m1.

1 ,274,477 Patented Aug. 6, 1918.

Ami-ma.

UNITED STATES PATENT OFFICE.

JOHN THOMAS wAnNE, or BURNABY, BRITISH COLUMBI CANADA.

, LOCK.

To all IO/(107M it may concern Be it known that I, Join: TuoMAs lVAnNn, a subject of the King of Great Britain, and a resident of the municipality of Burnaby, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Locks, of which the following is a specification.

My invention relates to improvements in locks, and the object of my invention is to provide a lock having means incorporated therewith for locking the lock bolt against unauthorizedretraction so that it cannot be readily opened except with the proper key provided for it, and which lock is.simple in construction and eflicient in operation.

I attain this object by the construction illustrated in the accompanying drawings in which- Fi'gure 1 is a view of the interior of the lock.

Fig. 2 is a cross section taken on the line a-b of Fig. 1.

Similar figures of reference indicate similar parts throughout the several views.

1 indicates the lock casing having a removable side plate 2 and provided with a keyhole 3, adjacent to which keyhole is arranged a similar construction to that found in locks in present use, such construction being indicated generally at 4 in Fig. 1 and consisting of the usual elements cooperating with the wards of the key bit with which the lock is supplied to prevent the turning in the lock of any but the proper key, in fact, the lock casing, with its key and tumbler arrangement may be made substantially the same as that of any well-known lock construction.

5 indicates the locking belt, which is slidably mounted for longitudinal movement in the casing, being shown in the projected locking position in Fig. 1. The belt 5 is provided on its upper edge with a plurality of rearwardly facing notches 6 and on its lower edge with a plurality of teeth 7, with which teeth engages normally a pinion 8, which pinion is mounted on and secured to the transverse rotatable shaft 9, this shaft being provided with the usual door knobs 10 on each end and rotated thereby, one knob only being shown, in Fig. 2, and indicated dotted in Fig. 1, from which it will be seen that the lock bolt 5 may be projected and retracted to lock or unlock the door by turning knob 10 in the required Specification of Letters l atont.

' l.atei1ted Aug. 6, 1918.

Application filed October 24, 1917. Serial No. 198,306.

direction, the projecting ol the bolt, however, being etl'ected without the necessity ol? turning the knob by means of a spring 11, which spring is disposed between the inner 'end of the bolt and the end plate of the easing 1 and'is compressed by the bolt when retracted. 12 and 13 indicate slotsformed in the bolt 5 and cooperating with suitably secured pins 1% and 15, by means of which the bolt is guided in its longitudinal travel.

In order to prevent unauthorized opening of thelock a pawl 16 is provided, which pawl is fulcrumed as at 17, the long end 18 normally engaging one of the notches 6 when the bolt is projected into the locking position, its short end 19 extending adjacent the keyhole and disposed in the path of the key bit so that it may be contacted thereby as it is turned in the lock, in either direction. 20 and 21 indicate spring members arranged to form a pair of spring jaws directly above the long end of the pawl, between which jaws the pawl is held clear of contact with the bolt when the same is to be retracted. 22 indicates the key, the bit of which is shown engaging the short end 19 and on the point of raising the long end 18 clear of the notch with which it is engaged.

The operation of my device will be apparent. Assuming that the parts are as shown in Fig. 1, the bolt being out and in the locking position, it will be seen that the bolt is held against inward movement by the engagement of the pawl 16 with the notch 6 and that no movement of the knob 10 can move the bolt until the pawl is raised clear of the same, therefore, in order to allow the bolt to be retracted it is necessary to insert the key, which must necessarily be the proper one, in the keyhole, and turn it in the direction of the arrow until the bit of the key contacts with, and bears down, the short end 19 ot' the pawl, thus raising the long end 18 and forcing it up between the spring jaws formed by the members 20 and 21, between which it is held clear of the It will be seen, therefore, that I have demampulatlon.

What I claim as my invention is: p 1. In a look, the combination with a casing having a key hole, of a key bit, a sliding a bolt having upper edge notches and lower edge teeth, an independent pawl pivoted 7 off center located between the bolt and key bit having its long end normally coacting with said notches and its short end disposed to be contacted by the key bit'so as to raise or lower the notch eng ging end, and a pinion engaging the said teeth by the rotation of which the bolt'may be projected or retracted.

' 2. In a lock, the combination with a casing having a keyhole,o'f a sliding bolt having upper edge notches and lower edge teeth, a suitably fulcrumed pawl having one end co-acting with the said notches and its other end disposed to be contacted by the key-:bit so as to raise or lower. the notch-engaging end, springl'aw's between which'the notchengagingen ,i s forced when raised, and a pinion engaging the said teeth by the rota tion of which the bolt may be projected or retracted.

3. In a lock, the combination with a casing having a key hole, of a sliding bolt mounted for projection or retraction and provided with upper edge notclis,- and a straight pawl suitably fulcrumed intermediate of its length having its long end coacting with said notches and itsshortend disposed to lie in the path of the key bit so that the, notch engaging end may be raised or lowered by direct contact of the key bit with the short end.

' 4,. In a lock, the combination with .a casing having. a keyhole, of a sliding bolt mounted for projection or retraction "and provided with upper edge notches, and a suitably fnlcrumed pawl having one end 00- acting with the said notches and itsother end disposed to lieginthe path of the key bit, so that the notch engaging end maybe raised orlowered by direct contact therewith.

Oct.,1-917. g

. JOHN THOMAS WARNE.

Copies of this patent "may beblitai'ii'e' dfor fiw cents each, by addressing the Commissioner of iatena.

' i WaisliiingtbiyDiC.

Dated at Edmonds, '13- 0., this {lth day df

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