Improvements in Locks for Doors and the like.
Year: 1897

page_text: Date of Application, 11th Nov., 1897-Accepted, 1st Jan.,
1898
COMPLETE SPECIFICATION.
Improvements in Locks for Doors and the like.
I, WILLIAM BURNLEY BUST, of 2 Commercial Chambers, Manse Street, Dunedin,
Otago, in the Colony of New Zealand, Engineer, do hereby declare the nature of.
my invention for IMPROVEMENTS IN LOCKS FOR DOORS AND THE LIKE," and in
what manner the saine is to be performed to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to locks used for fastening doors and the like and the
object of the present invention is to provide a lock with a reversible bolt which
may be readily adjusted so that it will engage with the catch plate after the door
has shrunken or from other cause has become separated from the catch plate; and
with means of operating the tumblers with certainty.
In a lock constructed according to my invention the handle operates a spring
bolt having the usual bevelled face projecting exteriorly and having a check pin
upon its shank which rests upon a stop when the bolt is projecting. This said
stop may be operated by a screw and the bolt allowed to project to a greater distance
as required, the stop being retained by the spring of the bolt, and thus the pressure
of the spring upon the bolt is kept practically constant. It is thus unnecessary to
have the bolt projecting so far from the lock as is the case with ordinary locks.
The bolt is operated by a toothed segment fixed upon the spindle of the handle,
the teeth of which segment engage with the teeth of a rack upon the shank of the
bolt. The check pin and rack are duplicated so that by reversing the bolt, the
lock may be used either for a right or left hand door.
The bolt operated by the key is provided with a slotted extension which receives
a guide pin as a support. The tumbler has an arm upon which a spring acts to
keep the tumbler down upon the bolt to lock the same.
In order that my invention may be most easily understood reference will be
made to the accompanying drawing whilst giving a detailed description.
Figure 1 is a side view of a lock with the inner plate removed.
Figure 2 is a plan of the same with the top plate removed.
Figure 3 is a cross section on line A-B Figure 1.
Similar letters refer to corresponding parts.
Referring to the drawing, the bolt (a) has a bevelled face (a¹) and upon its
shank (a2) is fixed the pin (a³) projecting on both sides. This pin (a³) normally
rests upon the stop (b) being pressed there against by spring (c) acting upon the
shank of the bolt (a). The adjusting screw (61) may be operated from the outside
of the lock by an ordinary screw driver or the like, is threaded to screw into the
stop (b) and has collars (62) which take upon each side of the guide block (63).
The bolt and stop are shewn on Figure 1 withdrawn as far as possible into the
lock, but by turning screw (61) they may be advanced to cause the bolt to project
further and thus reach a catch plate which from any reason is separated by a space
from the lock. It will be seen that as the screw (b) advances the stop and bolt,
the spring (c) is made to follow by the bent end (64) of the stop. Thus the pressure
of the spring (c) upon the bolt (a) is practically constant. The bolt is operated
by the toothed segment (f) which fits upon the spindle (f¹) of the usual handle.
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page_text: The teeth (2) of this segment gear with the teeth (a) of the rack (as) which forms
part of the shank (a). When the handle is turned the bolt is advanced and slides
upon the stud (a) and immediately the handle is released the pin (a³) will fall
back upon the stop (b). It will be seen that the rack (a³) and pin (a³) are duplicated
so that the bolt (a) may be reversed and the lock thus adapted to a right or left
hand door as required.
The lower bolt (g) or the bolt operated by the key has a slotted extension (g')
capable of sliding upon the pin (g) and the tumbler (h) has an arm (¹) upon which
a tension spring (2) looped upon stud (3) acts to keep the tumbler down upon the
bolt as shewn on the drawing.
I am aware that the screw (b) may be retained by means other than the block (13),
that a spiral spring may be used in place of spring (c), or a flat or laminated
spring in place of coil spring (42) and that the extension (g) of bolt (g) may slide
in a fork instead of being slotted to slide upon the stud (2) but these are obvious
modifications, and I have shewn the forms which I prefer and have found to
answer best in practice, being aware that the details may be modified in several
ways by a skilled person without exceeding the ambit of my invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is,
1. In a lock a bolt operated by a spring and provided with a check pin stop and
adjusting screw whereby the bolt may be adjusted to project from the lock as
required, substantially as and for the purposes set forth herein.
2. In a lock a bolt operated by a spring and provided with a check pin stop
and adjusting screw whereby, the bolt may be adjusted to project from the lock
as required and a rack whereby the bolt may be operated by a toothed segment
fitted upon the spindle of the handle substantially as and for the purposes set forth
herein..
3. In a lock a bolt operated by a spring and provided with a check pin stop
adjusting screw and rack said check pin and rack being duplicated so that the bolt
may be reversed, substantially as and for the purposes set forth herein.
4. The improvements in locks for doors and the like consisting of parts con-
structed arranged and operating substantially as and for the purposes set forth
herein and illustrated on the accompanying drawing.
Dated this 11th day of November 1897.
BOULT & WADE,
Agents for the Applicant.