US113112A - Improvement in railway-switch locks - Google Patents

Description

A.- THOMSON. RAILWAY SWITCH LOGK.

Patented Mar 28 (saw 4 tint $ll1it5 time one,

AROHIBALD Thomson-on ST. LOUIS, MISSOURI.

Letters Patent No. 113,112, dated March 28, 187.1.

IMPROVEMEMT IN RAILWAY-SWITCH LOCKS.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concern Be it known that I, ARGHLBALD THOMSON, of St. Louis, in the'county of St. Louis andState of Miss souri, have made certain new and useful Improvements in Railroad-Switch Locks; and I do hereby declare that the following is a full and true description thereof; reference being bad to the accompanying drawing and to the letters of reference marked thereon.

' In the use of the ordinary padlock for locking railroad-switches itis known that said looks, from exposure 'tothe weather, are rendered difiicult for unlocking, time consuming; also, said locks are easily broken andlost from their chain attachment, and otherwise are inefiective in'insuring perfect safety in the handling and adjustment of the switch, as required.

This to avoid,,and to form and improved switch-lock,

the nature of my invention consists in providing withiua slot of the lever or target a tumbler, spring, and bolt, said devices being so constructed and ar-' ranged that, by means of a turn-bolt, the switch-bolt can readily be locked or unlocked preparaioryto adjusting the switch, all of which will now more fully appear. I

To enable those herein smiled to make and use my said invention, I will now more fully describe the same, referring to the acoompanying Figure 1, as a perspective view of my lock;

Figure 2, as a detail sectional elevation enlarged;

Figure 3, as a detail side or rear view; and

Figure 4, as a side vieweof the switch-bolt.

The switchrstand has the target-lever A, and other-- wise is constructed in manner usual to operate the main and side railroad-tracks. I

In said lever I provide a rectangular-shaped slot, B, communicating with a side slot, b in said slots I arrange, respectively, the switch-bolt Q, tumbler O, and

spring devices a, as clearly shown in fig. 2.

The switch-bolt O is constructed to engage in the notches, of the switch-stand 'in manner usual, and should have sufilcient play to unlock from the switchstand when fitted in the slotted lever A.

Furthermore, an bolt I provide with a side groove, 0, (in which the spring 0 pivoted to the tumbler O is the tumbler 0 being for this purpose suitabiymortised" or slotted.

The bolt 0, tumbler O, and spring 0, when thus constructed and arranged within the slotted target A,

are held in operative position by face-plates D D,- properly secured by screw-bolts to said target-lever.

. The plate D, to allow for the free movements of the pin 0 in the adjustment of the bolt 0, is provided with an elongated slot, d, as shown in fig. 3; similarly the face-plate D has a suitable slot, at, slightly inclined, and arranged in position to allow for the inser tion of the turn-bolt or key, as indicated in fig. 1.

It will be observed that in the use of my said lock that, as the key or turn-bolt cannot be removed until- "the switch has been safely and properly locked,'the

inconvenience and accidents frequently arising from a misapplication of the switch are thus, in a. great measure, overcome.

My improved lock is also simple, cheap, and dura.- ble in 'its constructionand use, readily applied, and readily -operated.

Having thus fully described my said invention,

\Vhat I claim, and desire to secure by Letters Patent, is-

Animproved switch-lock,consi sting of the tumbler 0', spring 0, switch-bolt 0, having groove 0 and inclined notch'c, face-plates D D, when all said parts are arranged and combined to operate within slots B b of the lever A, in the manncr'and for the purpose described.

In testimony of said invention I have hereunto set my hand in presence of witnesses. Witnessesr ARGHIBALD THOMSON. WILLIAM W. HERTHEL,

ROBERT BURNS.

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