US1087585A - Door-lock. - Google Patents

Description

W. H. HOFFMANN.

DOOR. LOCK.

APPLICATION FILED JULY 3, 1912.

Patented Feb. 17, 1914.

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WILLIAM H. HOFFMANN, OF NEW YORK, N. Y.

DOOR-LOCK.

To all whom it may concern:

Be it known that I, WILLIAM H. Horr- MANN, a citizen of the United States, and a resident of New York city, borough of Manhattan, in the county of New York and State of New York, have invented certain new and useful Improvements in Door- Locks, of which the following is a specification.

This invention relates to certain new and useful improvements in door locks and the object of my invention is to provide a new and improved lock which can be readily locked or unlocked from the outside or inside to secure the door by one or more bolts and can be so adjusted that the door can be open at any time during the day by turning the knob, while by the same means the door can be locked securely at night and furthermore the lock can be so adjusted as not to be operative at all as a lock during the day, all of which is simple in construction, strong, durable and reliable.

In the accompanying drawings in which like letters of reference indicate like parts in all the figures: Figure 1 is an elevation of part of a door provided with my improved lock. Fig. 2 is an elevation of the lock mechanism, the outer cover plate being removed. Fig. 3 is an inner faceview ofsaid coverplate. Fig. 4 is a view similar to Fig. 2 showing the parts in another position. Fig. 5 is a vertical transverse sectional view on the line 5 5 of Fig. 4.

The lock casing 1 is to be mortised into a door 2 in the usual way or secured on the inner face. In the top, bottom and outer edge wall of the casing, the three bolts 3, 4 5 are guided, the bolt 3 extending to the swinging edge, the bolt 4 to the top edge and the bolt 5 to the bottom edge of the door, the bolts being suitably guided on the door to slide lengthwise.

Each bolt is provided at its inner end with a notch or transverse groove 6 for receiving a cam ridge 7 formed on a cam piece 8 located within the casing 1 and provided with a hub 9 secured 011 a knob spindle 10 mounted to turn in the casing and extending transversely through the door and casing and projecting from both faces of the door.

Tumblers 11 are pivoted at 12 to the inner surface of the cover plate 13 and their free ends are provided each with a nose 14 which are pressed downward by a spring Specification of Letters Patent.

Application filed July 3, 1912.

Patented Feb. 17,1214.

Serial No. 707,411.

15 to engage said noses with a lug 16 on the cam piece 8 and lock the latter in vertical position with the several bolts thrown out or shot. A flat lever 17 is pivoted at 18 to the inner side of the cover plate 13 and is provided at its lower. end with a handle knob 19 which passes through a curved slot 20 in the cover plate and at its upper end said lever 17 has a lateral flange or band 21 which can act on the rounded shoulders 22 on the bottom edges of the tumblers 11 and rest against the adjacent straight shoulders 23 on the tumblers.

A key can be passed through the key hole 2-iin the casing and the prongs on its bit can pass through the slots 25in a key guard plate 26 to prevent the use of improper keys the ends of the bit prongs act ing on the upper edges of the tumblers to raise the ends having the noses 14.

The spring 27 acting on thelug 28 of the cam piece 8 tends to throw the same into vertical position.

The operation is as follows: Fig. 2 shows all the bolts shot and the same locked in place so that it' is impossible to open the door by turning the knob, the cam piece 8 being locked in place by the tumblers 11. To unlock the door from the outside the proper key is inserted through the key hole 24 and turned to cause its bit to disengage the tumblers 11 from the lug 1.6 whereupon the cam piece 8 can be turned by means of the knob spindle 10 to withdraw the bolts as shown in Fig. 4. Before releasing the knob spindle and while the cam piece 8 is in the position shown in Fig. 4 the lever 17 is shifted to rest against the shoulders 23 as shown in Fig. 4 in dotted lines and thereby hold the tumblers in raised position to prevent their engaging the lug 16 on the cam piece 8 when the latter after the releasing of the knob spindle is thrown by its spring 27 into the vertical position. The door can now be opened and closed by means of the knob spindle in the usual manner. If the door is to be locked from the inside the lever 17 is shifted to release the tumblers which then engage the lug 16 on the cam piece 8 as soon as the latter assumes the vertical position. To lock the door from the outside it is only necessary to turn the knob spindle from the inside, to withdraw the bolts, then open the door, adjust the lever 17 so as to release the tumblers and then close the door from the outside, whereupon the tumblers will at once engage and lock the cam piece 8 and thereby the bolts.

In case the door is used very much as for example the main door of a business house and it is not desired that the knob should be turned each time the door is open, the cam piece 8 is to be lowered in the position shown in Fig. i, and for this purpose a screw 29 is mounted in the rear plate, that is, the plate facing the inside of the room in such position that when the cam piece 8 is in the position shown in Fig. 4: a threaded hole 30 in the cam piece 8 will be in alinement with the screw 29 and the inner end of this screw is engaged with said hole 30 and screwed into the same thereby securely locking the cam piece 8 in the position shown in Fig. t and thereby keeping all the bolts withdrawn. Before closing the place at night the screw 29 is unscrewed from the threaded hole 30 to release the cam piece 8 so that it can operate in the manner previously described.

Having described my invention what I claim asnew and desire to secure by Letters Patent is 1. The combination with a lock casing, of a series of bolts guided to move in the direction of their length only and each bolt composed of a single continuous piece, a rotative cam piece mounted to turn in said casing, and engaging the inner end of each bolt, tumblers in the casing for engaging and locking the cam piece, each tumbler being provided at one end with a nose for engaging the cam piece and provided in its bottom edge with a shoulder, a lever for shifting the tumblers and engaging their shoulders for holding the tumblers out of engagement with the cam piece, substantially as set forth.

2. The combination with a lock casing of three bolts acting to move in the direction of their length only and each composed of a single continuous piece, a rotative cam piece mounted to turn in said casing and engaging the inner edge of each bolt, tumblers in the casing for engaging and locking the cam piece, each tumbler being provided at one end with a nose for engaging the cam piece and provided in its bottom edge with a shoulder, a latch for shifting the tumblers and engaging their shoulders for holding the tumblers out of engagement with the cam piece, a screw projecting through the inner side wall of the casing, into the casing, the tumbler being provided with a hole into which said screw can pass when the cam piece is so adjusted as to hold the bolts withdrawn.

, Signed at New York city, in the county of New York and State of New York, this 24th day of June, A. D. 1912.

'WILLIAM H. HOFFMANN.

Witnesses M. E. MoNrNoH, It. Gr. BREEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0.

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