Improvements in Two Bolt Carriage Door Locks.
Year: 1887

page_text: Date of Application, 2nd Feb., 1887
Complete Left, 2nd Nov., 1887
Complete Accepted, 2nd Dec., 1887
Improvements in Two Bolt Carriage Door Locks.
I JOHN EDWARDS of No. 90 Greenwood Road Hackney in the County of Middlesex
Engineer do hereby declare the nature of this invention to be as follows:-
My invention consists in making an oblong opening in the latch or top bolt a stud
is formed in the lock case and fits into this opening acting as a slide for the latch bolt
to slide on also allowing a screw to be screwed into it to help hold the top plate in
position the lever stud on which the lever works I fix below the spindle hole in the
tongue of the lock and by bringing a suitable spring to operate this lever which is
made to press against the upper end of the spring the bolts are operated as required
and the door can be opened. I insert a roller in the lever which prevents the tongue
of the lock causeing undue friction at that part I use blade springs for operating the
top bolt instead of spiral springs which blade springs are fixed to the lock case.
Having now described the nature of the said invention and how the same is to be
effected what I claim is forming an opening in the top bolt and forming a stud on the
lock case for the top bolt to slide on placing the stud on which the lever works below
the spindle hole in the tongue and in putting a roller in the lever to prevent undue
friction at that part.

page_text: The invention is described hereafter with reference to the accompanying Drawing in
which is shown in elevation with plate of the lock case removed a lock constructed
according to this Invention.
h
According to the Invention an oblong opening a is made in the latch or top bolt b
and a stud c is formed on or fixed to the lock case and fits into this opening a acting
as a slide or guide for the latch bolt b to slide on also allowing a screw to be screwed
into it to help hold the top or covering plate of the lock case in position. The lower
stud d on which the lever e works is fixed below the spindle hole in the lock bolt g
and a spring presses against the upper end of and operates the said levere the top
bolt being provided with a spring or springs i, which press it forward, and with a
projection against which the lock bolt g operates to move back the said top bolt.
An antifriction roller k is inserted in the lever e to bear on the projection of the lock
bolt g which roller prevents the tongue of the lock causing undue friction at that part.
Either spiral springs i as shewn or a blade spring may be used for operating the top
bolt. When the door is closed the bolt is pressed to the secured position by the
springs i, the said bolt acting as a latch, and the bolt g can be shot out for locking
the door more securely by means of a handle the spindle of which enters the opening,
in the bolt g. When the door is being opened by means of a handle or key inserted
in the opening in the bolt g, the lever e is pressed back by the operation of withdrawing
the bolt, which bolt by acting against the projection on the bolt b by a further
motion of the handle, withdraws also the said bolt b and releases the door.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed, we declare that what
we claim is :-
:-
1. In two bolt carriage locks an opening or slot in the top bolt and a stud on the
lock case for the said opening or slot to engage with and the said top bolt to slide on,

page_text: the said parts being arranged and operated substantially as hereinbefore described
and illustrated by the accompanying Drawings.
2. In two bolt carriage locks a top bolt arranged as claimed by the preceding
claiming clause and a second bolt against which bears a lever centred below the spindle
hole in the tongue all the said parts being arranged and operating substantially as
hereinbefore described and illustrated in the accompanying Drawings.
3. The arrangement and combination of parts constituting the carriage door lock
hereinbefore described and illustrated in the accompanying Drawings.
Dated this 1st day of November 1887.
J. F. HEPBURN.
B. PEART.