Year: 1887

page_text: Date of Application, 29th Nov., 1887
Complete Specification Left, 29th Aug., 1888
Complete Specification Accepted, 5th Oct., 1888
We, JOHN EGBERT ELGOOD, RICHARD HARRIS ELGOOD, THOMAS SCOTT ELGOOD,
trading as Elgood Brothers of Market Street and Peacock Lane Leicester, Locksmiths
and Art Metal Workers, do hereby declare the nature of this invention to be as
follows:-
Our invention relates to the improvements in the construction of the internal parts
of locks, and embodies means whereby the friction of the principal moving parts is
considerably lessened and easier movement therefore obtained; and also for
strengthening and thereby increasing the durability of certain parts of the lock which
are usually left thin and weak.
In order that our invention may be the more readily and distinctly understood,
reference is made to the drawings accompanying this specification which exhibit
internal view of locks bearing our improvements. We distinctly reserve to ourselves
however the right to make any proper modification or departure from the structural
details set forth in these drawings.
In figure 1, A A are two suitable wheels or rollers, fitted in the horns of the
follower A and capable of revolving upon their axes A².
B is a wheel or roller similar to A fixed in the lower end or side of the tail of the
latch, and capable of moving freely upon its axis B². It will be observed that when
it is desired to bring the latch bolt D flush with the edge of the lock or door upon
which the lock is fixed, the spindle passing through E receives the necessary motion
from the knob thereon, and causes the periphery of either of the rollers A to press
and revolve against the vertical part or tail B¹ of the latch and move it freely back-
wards upon the roller B and effect the desired result.
By the employment of the rollers A the friction which usually occurs between the
follower A and the latch tail B is considerably reduced and the friction inciden
upon the downward tendency of the laich caused by its own weight, and by the fact
of the followers, not being placed in a direct line with the axis of the latch head, is
provided against by the roller B.

page_text: Figure 2 represents a modification of our invention showing an alternative arrange-
ment the friction rollers A being fitted in the tail of the latch, and the roller B, to
facilitate the horizontal movement of the latch, is fitted into the rim of the case.
Our invention further relates to means for strengthening the weak parts of the
bolt, for which purpose a rib C₁ is cast upon and forms part of the bolt For
latch D and may be made flush with the top or upper surface of the bolt as shown in
figure 1.
Figure 3, illustrates the application of strengthening ribs C² and C³, to the lock
bolt and latch bolt. The ribs may be of any convenient size and shape and cast
upon and formed integrally with the bolts, or secured to the latter by suitable means
as may be desired.
Dated this 29th day of November 1887

page_text: Improvements in or relating to Locks.
We, JOHN EGBERT ELGOOD, RICHARD HARRIS ELGOOD, & THOMAS SCOTT ELGOOD
trading as Elgood Brothers of Market Street and Peacock Lane, Leicester, Locksmiths
and Art Metal Workers, 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 :-
Our invention relates to improvements in the construction of the internal parts of
locks, and embodies means whereby the friction of the principal moving parts is
considerably lessened, and a freer movement therefore obtained; and also to
strengthening and thereby increasing the durability of certain parts of the lock which
are usually left thin and weak.
In order that our invention may be inore readily and distinctly understood reference
is made to the drawings accompanying this specification which exhibit views of
the internal parts of a lock bearing our improvements. We can however make
modifications in or departures from the structural details set forth in these drawings
without departing from the spirit of our invention.
Fig. 1 is an internal view of a lock embodying our improvements.
Figures 2, 3 & 4 are modified details of Fig. I hereafter referred to.
In Fig. 1, A. A. are two suitable wheels or rollers, fitted in the horns of the
follower A and capable of revolving upon their axes A².
B is a wheel or roller similar to A, fitted in the lower end or side of the tail B¹
of the latch D and capable of revolving freely upon its axis B². When it is
desired to bring the latch bolt D flush with the edge of the lock case, or door upon
which the lock is fixed, the spindle passing through E receives the necessary motion
from the knob thereon, and causes the periphery of either of the rollers A to press
and revolve against the tail B' of the latch D and move it freely backwards upon the
roller B and effect the desired result. Immediately the knob of the lock is released
the spring H and dog H¹ come into action, and force the latch bolt D forward
again.
We prefer to make the follower A' with a projection A³ on the back thereof to
receive the bearing of the tail B₁ of the latch bolt 1) from the spring H & dog H¹.
By the employment of the wheels or rollers A. A the friction between the follower A¹
and the latch tail B is considerably reduced, and the friction from the downward
tendency of the latch caused by its own weight, and by the follower not being placed
in a direct line with the axis of the latch head is provided against by the roller B.
Figure 2 represents a modification of our invention showing an alternative arrange-
ment; the anti-friction rollers A. A being fitted in the tail B' of the latch D, and
the roller B to facilitate the horizontal movement of the latch being fitted into the
rim of the case.
Our invention further relates to means for strengthening the weak parts of the
bolt, for which purpose a rib C is cast upon & forms part of the bolt F and may
be made flush with the top or upper surface of the bolt as shown in Fig. 1.

page_text: Figures 3 & 4 illustrate the application of strengthening ribs C² & C³ to the lock
bolt F & latch bolt D. The ribs may be of any convenient size and shape, and cast
upon and formed integrally with the bolts or secured to the latter by any suitable
means.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
1. In a lock the combination with the follower such as A' of rollers A substantially
as and for the purpose described and illustrated in Figure 1 of the accompanying
drawing.
2. In a lock the combination with the latch bolt D of a roller B substantially as
and for the purpose described and illustrated in Figure 1 of the accompanying
drawings.
3. In a lock the combination with the tail B₁ of the latch bolt of rollers A,
substantially as and for the purpose described and illustrated in Figure 2 of the
accompanying drawings.
4. In a lock the combination with the latch bolt D of a roller B pivotted upon the
case of the lock substantially as and for the purpose described and illustrated in
Figure 2 of the accompanying drawings.
5. In a lock the employment of the strengthening ribs such as (3, C2, C³ upon the
bolt and latch bolt respectively, substantially as and for the purpose described and
illustrated in Figures 1, 3 & 4 of the accompanying drawings.
JOHN EGBERT ELGOOD.
RICHARD HARRIS ELGOOD.
THOMAS SCOTT ELGOOD.