Year: 1888

page_text: I, FRANCIS JOSEPH JAMES GIBBONS, of Saint John's Works, Church Lane Wolver-
hampton in the County of Stafford, Lock Manufacturer, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The features of novelty in this invention consists principally in improvements upon
a Patent taken out on the Twenty first day of June 1854-number 2980-by my
father, now deceased.
Before describing my improvements I will refer to the accompanying drawing-A-
which is a copy of Fig. 9-Sheet 3 of the above specification-A-is a loose tail piece
attached either to the latch bolt or to the back follower-B-by a pin joint--is
the follow or double lever, the axis of which works within a space in the tail
piece-A-strengthened by a curved piece-D-the back follower-B—being
worked by a spring rivetted into the plate of the lock.
In this it will be seen, one of the objects in view was that of equalizing the action
of the follow or double lover, whilst one of the most important features in this kind
of lock-namely that of getting it as near as possible to the bottom of the case,
appears to have been overlooked-Moreover whilst also aiming at the reduction of
friction, from the fact of forming knife edges upon what are commonly called the
horns of the follow or double lever, as shewn at-C-C-it has positively been
increased.
By comparison of—A—and Fig. 1 of the accompanying drawings 1 will now
proceed to describe the nature of my improvements, letters of reference being had
thereto which are the same in both cases.
Fig. 1Firstly my improvements consists in carrying the follow or double
lever to the extreme bottom end of the lock case. Secondly-notwithstanding
that I also employ a loose tail piece-A-I no longer employ a space therein
strengthened by the curved piece-D-wherein the axis of the follow or double lever
turns as above.
In lieu of this however I lengthen the upper part of the follow or double lever-C
and upon either side of which I form two circular bosses-C. C-as shewn in doited
lines and commonly called the horns, which lie upon the lugs-E. E-on either side
of the under part of the loose tail piece-A-whilst the adjoining part which extends
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page_text: from the axis of the follow or double lever fits in the space between the lugs-E. E-
and by virtue of its diminishing in width down to the axis, compensates for the side
motion of the loose tail piece when withdrawing the latch bolt.
In the latch and locking bolt and springs for working the other parts there is
nothing new.
Having now particularly described and ascertained the nature of my invention,
and what manner the same is to be performed, I declare that what I claim is
Improvements upon my deceased fathers Patent No. 2980 dated June 21st 1854-
whereby I bring the follow or double lever-C-to the extreme bottom end of the
lock, dispense with the space in the loose tail piece-A-and in order to reduce
friction, employ circular bosses or horns upon the follow or double lever, in lieu of
knife edges, substantially as herein described and illustrated by the accompanying
drawings.
Dated this 10th day of March 1000