US117764A - Improvement in locks for railroad cars - Google Patents

Description

` PATENTED AUG 8 '1871 OFFICE.

CHARLES T. GIBSON, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN LOCKS FOR RAILROAD CARS.v

Specication forming part of Letters Patent N o. 117,764, dated August 8, 1871.

To all whom t may concern:

Beit known that I, CHARLns T. GIBSON, of the city and county of Baltimore and State of Maryland, have invented a new and useful Improvement in Locks for Railroad Freightllars; and I do hereby declare that the .following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making part of this speeication, in which- Figure l is a perspective view of the lock-case and bolt. Fig. 2 is a view of the lock mechanism, showing the hooked dogs locked and retaining the notched bar. "Fig: 3 is a similar view of the same parts shown in Fig. 2, indicating the dogs unlocked. Figs. 4 show the sliding dogplate.

Similar letters of reference indicate'correspond? ing part-s in the several igures.

This invention relates to imliirovements on locks which are designed for the doors of railway freight-cars, wherein two vibrating hooked dogs are employed as the means for locking a bar or bolt over a hasp.

. These locks, as hitherto constructed, can be easily picked by inserting a thin strip of metal into them and pressing back the dogs.

To obviate this objection, the nature of myinvention consists in connecting the pivoted dogs to a sliding plate which is acted upon by the key and timbers, and also by the bolt or notch-bar, as will be hereinafter explained.

The following' description of my invention will enable others skilled in the art to understand it.

In the accompanying drawing,'Fig. 1, A represents the lock-case; B, an extension thereof; and Af, a guide for receiving a notched bar or bolt, O. On the iiat extension B an elevatioma, is formed for entering an oblong slot made thro ugh the hasp of the lock. These parts above named are ofthe well-known form, and are not claimed by me. The lock-case A receives the lock mechanism which is applied to the back plate D, as shown in Figs. 2 and 3. F F are two hooked dogs, which are pivoted to posts g g arranged on opposite sides oi' a slide, E. This slideE is shown by Figs. 4 detached from the plate D. It is a curved plate having a thickened concave portion, c, formed on its lower end, and a rectangular projection, c', rising perpendicularly from its surface near its upper end. An oblong slot, t, is made through it near the middle of its length for receiving the post o of frame-plate h, and serving, in conjunction with a stud, o, to guide and keep in place the slide E. Just in rear of the concave thickened portion c of the said slide, and on opposite sides of the middle of the width thereof, are two oblong holes, a a, which receive pins f f on the dogs F F, and so connect the dogs to 'the slide that they all three move together. The

slide cannot be moved without the dogs, nor the latter without the former. The lower concave end of the slide E is directly opposite the opening through the lock-case through which the arrow-head c of the bolt or bar C enters this case. Between the plate h and the back plate D a number of tumblers, s, is applied and pivoted to the post o. These tumblers s are acted upon by springs t', and they are notched to receive the rectangular stud c when the dogs are unlocked, as shown in Fig. 3. When the dogs are brought together on the arrow-head of the bolt (l, as

` shown in Fig. 2, the upper ends of the tumblers move beneath the stud e', which locks the dogs and prevents their hooked ends from being separated so as to release the head of bolt O. A spring, j, is applied to a post on plate D so as to bear against one edge ofthe slide E, and, by its friction, prevent any loose motion of this slide. This springj may be dispensed with, if desired, and I do not confine my invention to its use.

When the arrow-head c on bolt G is pressed forcibly against the lower end of the slide E this slide will rise, and, at the same time, bring together the hooked ends of the two vibrating dogs F F, which hooked ends will be received into the notches in the upper end of the bolt C 5 at the same time the springs t will force the upper ends of the tumblers s beneath the stud e on the slide E, thus locking the slide and its dogs so that they cannot be again moved without first bringing all v the notches in the tumblers to register' with said stud c by means of the key.

I do not claim a slide and dogs combined, when the dogs are disconnected from the slide, tripped by the slide, and held in position by springs which act upon the dogs, as shown in Henry Ritchies patent of April 7,1857; nor do I claim the combination of a slide and dogs in a lock l which is not self-locking, as is the ease in the to the plete D et g g and t0 the slde'E et ff, patents grantedto E. L. Gaylord, September 3, and the tumbler-s s arranged es described, and 1867, and to Walsh, Connelly, and Brett, Deeemthe bolt C operating by direct pressure upon the ber 2l, 1869. slide, substantially as set forth.

What I claim as my invention, and desire to CHARLES T. GIBSON. secure by Letters Patent, is- Witnesses:

The slide E, constructed zuid arranged as de WM. J. KING,

scribed, the inwardly-hooked dogs F F pivoted WVM. A. STAYLOR.

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