US209812A

US209812A - Improvement in locks

Info

Publication number: US209812A
Authority: US
Publication date: 1878-11-12
Anticipated expiration: 1895-11-12

Description

UNITED STATES PATENT OEEIoE.

JOHN JETT, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN LOCKSJ.

Specification forming part of Letters Patent No. 209,8 l2, dated November 1:2, 1878; application led April 12, 1878.

To all whom t may concern:

Be it known that I, JOHN JETT, of the city and county of San Francisco, State of Galifornia, have invented a certain new and useful Improvementin Tumbler-Locks, which invention is fully set forth in the following specilication and accompanying` drawing.

The object I have in View is to produce a simple and cheap tumbler-lock, of such conipact construction that it can be made of small size for use upon doors or trunks, boxes, va' lises, or other small articles, and will bevery secure. and durable. This I accomplish by employing a bolt with a recessed shank, in which recess are pivoted at their forward ends to the bolt a number of tumblers, which ll the recess and make the shank of the blt, with the tumblers attached, of the same thickness as the head of the same. The bolt and tumblers are carried by a peculiar frame-work, the subject of this invention, which securely y holds and guides the moving parts of the lock, and is constructed as fully hereinafter explained.

In the drawings, Figure l is a side view of the lock; Fig. 2, a separate view of the bolt and tumblers, Figs. 3 and 4, cross-sections of the lock, Figs. 5 and 6, views of the keys.

Like letters denote corresponding parts.

O is the bolt, with recessed shank 5 D, the pivoted tumblers, having locking-notches a g b, the springs for pressing the tumblers downwardly, E and F, the keys. Upon these parts I lay no claim.

The case or frame of the lock is composed of a rectangular plate, A, of the proper size, and having a key-hole or slot, a', in its lower edge. At one end of the back-plate A is secured at right angles thereto (or cast therewith) the face-plate C', through which the bolt is projected when thrown. Near the other end of the plate A is secured or cast a plate, f, parallel with the face-plate, but not extending to the top of the back-plate, as does such faceplate.

The shank of the bolt and the tumblers slide over this plate f, and the notches a g engage with the top of the same. Just above the catch-plate j' is the saddle-plate el, secured to or cast with the back-plate at right angles to the face-plate and the strip e on the line of the bolt and tumblers, and close against the side of the tumblers and bolt, so as to guide and steady the same in its movement.

By means of this frame the lock can be made very light and cheap. The open framework allows the lock to be easily fixed when out of order without removing any part of the case. It also completely secures and guides the bolt, tumblers, and springs, and is sufficiently strong to be durable in use.

I ain aware of the patent granted September 25, 1840, to Peter Rogers, and hereby disclaim the same.

What I claim as my invention :is-

The open case for a lock carrying a bolt with spring-tuinblers pivoted thereto, consisting of the back-plate A, with key-hole, the face-plate C', through which the end of the bolt projects, the plate f, with which the notches in the tumblers engage, the plates c1l e2, for guiding the tumbler-springs, the plate B, and the strips d e, all constructed and arranged substantially as described and shown. In testimony that I claim the foregoing I have hereunto set my hand and seal this 18th day of March, 1878.

JOHN JETT. lL. s.]

Witnesses:

C. W. M. SMITH, CEAS. E. KELLY.