US60257A - roulstone - Google Patents

Description

@uiten tatie @anni @frn yIll/llli,OVElllllllilIf IN LOCKS;

Be it known that I, Ei A. G.RonLsTONE, of Roxbury, in the county of Norfolk, and State of Massachusetts, l,

have invented an Improvement in Locks ,and I do hereby declare that'the following, taken in conneton with the drawings which accompany and form part of this specification, is a descriptionof my` invention sulicient ,i l

to enable those skilled in the art to practise it, a

The improvement relates generally to tlleconstrnction or arrangement of" partsof spring loelis for trunks.

but more particularly to the construction and method of operation of a 'sliding spring, hasp, or bolt.

The drawings represent, at A, a front view of the lock, showing the mechanism in dotted lines, the haspfor` i bolt being locked. B shows the position of the parts when unlocked.' a denotes the back plate ofthe lock, which is applied to the front of Y the trunk the outer plate thereof, the locking mechanism being contained between them. c is the inner and d the outer plate, between which the hasp e slides. To the plate a, a series of'` tnmblers or levers, f, are hung. Two setsof them are shown, their ends operated upon by the key, interlocking so that by turning the key these ends shall be simultaneously elevated to throw `outward the hooks or spring i latches, g, on the upper ends of the tumblers. The tumblers a-re held normally in position byspringsA hpas` i seenat A. The hasp or bolte, whichslides between the plates c d, has two projecting latches z', at its lower` end, with inclines c, and at its upper end lateral projections ZL The bolt slides between ways or guides on eah` side of it as seen at A, and the extent of itsy downward movement is limited by` one or more projections l,

striking stops m, in the plated. In yits upward movement the latches or projections t', strike the bottom of the` plate d, or the extent of its upward movement may be limited by the bottom ofa slot r in the bolt strikinga i projection n from the plate d. In'this slot, and a .counter slot in the plate d, is a spring o, one end abutting against the plate projection n, and the other against a projection p, from the bolt. This spring holdsthe bolt normally out of the lock, or away from the locking mechanism as seen at B, in which position the lid of the trunk or chest to which the lock is applied is raised and lowered without being locked. If, however, `the hand be applied to the head g of the bolt, (which when the trunk is unlocked projects from the bolt case as seen at` i 13,) and the bblt pushedV .downwards the inclines c press back the tumbler latches until the projections z' slip by them, when the tumbler springs will press the latches up over the projections z', and the trunk will be securely locked. If now the ky be applied, and the tumbler latches thrownback, the bolt will be thrown up bythe action of its spring o, and the trunk will be unlocked. The bolt c may have `the projection 'i only on one side 1 of it, in which case only one set of tumblers will be required, but I prefer the construction shown. It will `be readily understood that the spring bolt, locked by being pressed 4into position, and dying from the tumblersor locking mechanism upon turning the key,-may be applied to mortise 4and other door` locks, As a trunk lock,`it is very serviceable and strong, simple in its construction, and of a very convenient and desirable form, being much superior to the common swinging hasp lock, or to the ordinary spring locks.

I claim the bolt e,- constructed to operate'in connection with a locking mechanism, substantially as set forth.` i i y E. A. G. ROULSTONE.

Witnesses:

J. B. CROSBY, F. Gouw.

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