An Improved Drill-brace.
Year: 1892

page_text: Date of Application, 21st Mar., 1892
Complete Specification Left, 21st Dec., 1892-Accepted, 4th Feb., 1893
PROVISIONAL SPECIFICATION.
An Improved Drill-brace.
I, HERBERT ALFRED LUCAS BARRY, of The Nook, Avenue Road, Erith, in
the County of Kent, Engineer, do hereby declare the nature of this invention to
be as follows:-
This invention relates to an improved drill-brace; its objects being to diminish
wear and tear and to avoid the noise and loss of motion incidental to the mechanism
employed in an ordinary ratchet-brace for causing the vibratory movement of the
hand-lever to rotate the drill.
In carrying out my invention, I employ a hollow cylindrical body, one end of
which contains a socket for the base of the removable drill. The centre or pivot-
pin of the drill screws into the other end of the hollow cylindrical body; the
A collar
independent rotation of this centre or pivot-pin effecting the feed.
is formed on or secured to the cylindrical body near the end containing the socket;
a flat link slipped over the body lying on each side of this collar. The hand-lever
is pivoted between the free ends of the two links; the boss of the hand-lever being
in contact with the collar on the body. The pivot-pin or bolt by means of which
the lever is connected to the links is put through the boss eccentrically. Near
the circumference of the boss, a small pin is driven through the lever; the
projecting ends of this pin engaging in one direction of motion with ears formed on
the links.
The action of the parts is as follows:-When the hand-lever is moved for the
purpose of actuating the drill, the boss of the lever turns to a slight extent on its
pivot and, being pivoted eccentrically between the links, engages with the collar
on the cylindrical body; the friction of the lever and links on the collar and body
being sufficient to communicate the movement of the lever to the body and
consequently to the drill. The extent of travel of the hand-lever having been
reached, the hund-lever is moved back into its normal position, whereupon the boss
of the lever becomes disengaged from the collar, and the projecting ends of the
small pin are brought into contact with the ears on the links and cause the links to
rotate on the cylindrical body until the direction of movement of the lever is
again changed; the boss of the lever thereupon immediately re-engaging with the
collar.
Dated this 17th day of March 1892.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.
COMPLETE SPECIFICATION.
An Improved Drill-brace.
I, HERBERT ALFRED LUCAS BARRY, of The Nook, Avenue Road, Erith, in
the County of Kent, Engineer, 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 :—
This invention relates to an improved drill-brace; its objects being to diminish
wear and tear and to avoid the noise and loss of motion incidental to the mechanism
employed in an ordinary ratchet-brace for causing the vibratory movement of the
hand-lever to rotate the drill.

page_text: In the accompanying drawings,
Fig. 1 is a side elevation and Fig. 2' a plan of a drill-brace constructed according
to my improved method
In carrying out my invention, I employ a hollow cylindrical-body A A¹, one
end A of which contains a socket (shown in dotted lines in. Fig. 1) for base of the
removable drill. The centre or pivot-pin C of 'the drill screws into the other
end A' of the hollow cylindrical body; the independent rotation of this centre or
pivot-pin effecting the feed. A collar D is formed on or secured to the cylindrical
body near the end A containing the socket; a flat link E slipped. over the body
lying on one side and a similar link E' on the other side of this collar. The
hand-lever F F is pivoted between the free ends of the two links E and E'; the
boss F of the hand-lever being in contact with the collar D. The pivot-pin or
bolt G by means of which the lever is connected to the links is put through the
boss eccentrically. Near the circumference of the boss, a small pin His driven
through the lever F F; the projecting ends of this pin engaging in one direction of
motion with ears e and e¹ formed on the links.
The action of the parts is as follows:- -When the hand-lever F F¹ is moved for
the purpose of actuating the drill, the boss F¹ of the lever turns to a slight extent
on its pivot G, and, being pivoted eccentrically between the links E and E, engages
with the collar D on the cylindrical body A A'; the friction of the lever F F and
links E and E' on the collar D and body A A' being sufficient to communicate the
movement of the lever to the body and consequently to the drill. The extent
of travel of the hand-lever F F¹ having been reached, the hand-lever is moved
back into its normal position, whereupon the boss F of the lever becomes disengaged
from the collar D, and the projecting ends of the small pin H are brought into
contact with the ears e and e on the links E and E' and cause the links to
rotate on the cylindrical body A A' until the direction of movement of the
lever FF is again changed; the boss F' of the lever thereupon immediately
re-engaging with the collar D.
Having now particularly described and ascertained the nature of this invention':
and in what manner the same is to be performed, I claim :-
1. The improved drill-brace constructed and operating substantially, as described
with reference to the accompanying drawings.
2. In a drill-brace, the combination, with a body A A¹ and a collar or boss. D,
of links E and E¹, a lever F F, a pivot-pin or bolt G, and a pin H for engaging
(when the lever is moved back) with ears e and e on the links E and E¹,
substantially as and for the purposes herein set forth.
3. In a drill-brace, operating the drill-holder by means of a lever mounted therein
but pivoted eccentrically and in such a manner that, on the lever being vibrated
about its pivot, the full part of the eccentric bears against the body of the
drill-holder and serves to impart a rotative motion thereto..
Dated the 17th day of December 1892.
G. G. M. FRDINGHAM,
191, Fleet Street, London, .C., Chartered Patent Agent.