US1272710A - Lock. - Google Patents

Description

J. C. RAMSHEH.

LOCK.

APPLICATION FILED mac. 29. 1916.

1,279,710. Patented July 16, 1-918.

INVENTOR I V Jaw/57265 ATTORNEY ia'r carton JOHN CYRES RAMSHER, 0F SHENANDOAH, PENNSYLVANIA.

' LOCK.

To all whom it may concern Be it known that I, JOHN Crnns RAM- sHnn, a citizen of the United States, residing at Shenandoah, in the county of Schuylkill and State of Pennsylvania, have invented new and useful Improvements in Locks, of which the following is a specification.

This invention comprehends the provision of a door lock primarily designed for use in connection with car doors,-and embodying a mechanism that can be actuated to release the door only by those familiar with the operation of the mechanism, it 'being necessary to manipulate a certain combination of elements without the use of a key, and Which fact largely prohibitsthe door from being unlocked by unauthorized persons.

The nature and advantages of the invention willbe better understood when the following description is read in connection withthe accompanying drawing, the inventionresiding in the construction, combination. and arrangement of parts as claimed.

In the drawing forming part of this specification like numerals of reference indicate similar parts in the several views and wherein:-

Figure 1 is a vertical sectional view through the lock.

Fig. 2 is an elevation of one side of the lock casing removed.

Fig. 3 is a detail sectional view.

Referring more particularly to the drawing in detail, 10 indicates the usual lock casing inwhich the mechanism is arranged. The mechanism as shown preferably embodies a sliding bolt 11 which has a tendency to assume a projected or active position, under the influence of the spring 12, which latter has one end bearing against the bolt and its opposite end against the adjacent Wall of the casing 10. The bolt is provided with an upper and lower series of rack teeth 13 and 14, respectively, while journaled within the casing for engagement with the lower series of the teeth 14 is a gear wheel 15 fixed upon a stem 16 which projects through the side of the casing and is provided with a knob 17 whereby the wheel may be rotated to effect an adjustment of the bolt 11 in a manner that will be hereinafter more fully described.

Mounted for partial rotation in the side wall of the casing 10 is a stem 18 which is provided with a knob 19 arranged exteriorly of the casing for rotating the stem, while Specification of Letters Patent.

Application filed December 29, 1916.

Serial No. 139,571.

carried by the stem adjacent its opposite extremity is a dog 20 which is adapted to engage the rackteeth 13 for locking the bolt 11 in projected or active position. A stem 21 is also mounted for rotation within one side of the casing, having a knob 22 disposed exis one terminal of a coil spring 25, which latter is coiled about the bushing and the adjacent extremity of the stem, the other terminal of the spring being secured to said stem and operating to effectively hold the stem in a position whereby the shoulder 26 formed thereon will engage against the bolt with a view of assisting the stem 18 in holding the bolt in projected position. It might here be stated that the stem 21 is so threaded with the socket 2-1 that when the stem is rotated in the direction to move the shoulder 26 out of engagement with the bolt, the spring 25 is unwound or in other words placed under tension, so that upon release of the stem 21 the spring functions to quickly return the latter to normal position. A third stem 27 is mounted for rotation in one side of the casing, projecting from the latter and provided with a knob 28 for manipulating the stem, while the opposite end of the latter is arranged within the slot 23 of the bolt. This extremity of the stem is provided with a cross piece 29 which when arranged in a vertical position adjacent the shoulder 30 defined by the slot 23 in the bolt,'also prevents the bolt from being retracted to its inactive position, as this can only occur with regard to the stem 27, when the latter is rotated to cause the cross piece 29 to assume a horizontal position in aline ment with the slot 23 as will be readily understood. Manifestly, the bolt 11 is locked in its projected or active position in the distinct manners above described, and in order to successfully manipulate the mechanism to unlock the door the respective stems 18, 21 and 27 must be manipulated by rotating the same in the proper direction to release the locking bolt 11, whereupon the stem 16 is rotated to impart a similar movement to the wheel 15, which latter in turn retracts the bolt within the casing. While the stems 18 and 27 remain in their adjusted positions,

Patented July 16, 1918.

it is necessary to hold the stem 21 disengaged from the locking bolt while the latter is being adjusted.

The locking bolt is further provided with a series of rack teeth 30 which are engaged i a suitable bracket 35, the rod 34: carrying at its free end an abutment member 36. A coil spring 37 encircles the rod 34 and is operatively associated therewith to hold the abutment member 36 normally projected, and the pawl 31 normally in engagement with the rack teeth 30 of thebolt 11. In practice, when the door is moved to its closed position the abutment member 36 engages the door jamb, whereupon the rod 34 is retracted and the proper movements imparted to the arm 32 and the pawl 31 to disengage the latter from the rack teeth 30, thereby releasing the bolt to be projected to an active position through the instrumentality of the spring 12. WVith the door in closed position the rod 34: is held retracted with the spring 37 under tension, and also with the pawl 31 disposed in an inactive position. l/Vhen it is desired to open the door the bolt is first released from the locking means above described, and the bolt "subsequently retracted within the casing against the tension of the sprin 12. The bolt may be held in this position y means ofthe stem 16, until the door is opened, whereupon the rod 34 is eX- tended or projected as the spring 37 eX- pands, during which the pawl 31 is brought into engagement with the teeth 30 of the bolt to lock the latter in a retracted or inactive position.

WVhile it is believed that from the foregoing description the nature and advantages of the invention will be better understood, I desire to state that I do not limit myself to the precise construction and arrangement of parts herein shown and that such changes may be resorted to when desired as fall within the scope of what is claimed.

IVhat is claimed is I 1. In a door lock, a casing, a spring pressed sliding bolt, means for holding said bolt retracted against the tension of said spring, said means including a rack bar carried by said bolt, an outwardly spring pressed plunger slidable within said casing and having its outer end normally projecting therebeyond, a link pivoted within said casing transversely of said bolt and having one end pivotally and slidably connected with the inner end of said plunger, and a pawl pivoted upon the other end' of said link and normally engaging said rack bar, engagement of the projecting end of said plunger with the door jam releasing said pawl from engagement with said rack bar.

2. In a door lock, a casing, a spring pressed sliding bolt and releasable means for holding said bolt in its protracted position, said means comprising a transverse pin revoluble through the sides of said casing, oppositely extending lugs on the sides of said pin, said bolt being provided with a narrow longitudinal slot communicating with a relatively wide longitudinal slot, and a shoulder at the juncture of said slot, said pinand said lugs being disposed Within said rela tively wide slot when said bolt is in its protracted position, engagement of said shoulder with said lugs preventing retraction of said bolt, partial rotation of said pin to release said lugs from engagement with'said shoulder permitting retraction of said bolt with said relatively narrow slot passing over said pin.

In testimony whereof I affix my signature.

JOHN ovens RAMSHER.

copies of this patent may be obtained for five cents each, byjaddressing the Commissioner e2 Patents.

Wuhington, ID. 0. r

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