IHOVIDIUNAI ST MULTICATION An Improvement in Drill Braces.
Year: 1888

page_text: Date of Application, 28th Aug., 1888
Complete Specification Left, 15th May, 1889-Accepted, 22nd June, 1889
IHOVIDIUNAI ST MULTICATION
An Improvement in Drill Braces.
I, GEORGE RICHARD POSTLETHWAITE of Park Road, Aston near Birmingham in
the County of Warwick Manufacturer do hereby declare the nature of this invention
to be as follows:-
This invention relates to drill braces, and is an improvement upon Letters Patent
granted to me on the 12th day of September 1884 and Numbered 12,319.
The object of my present invention is ensure absolute action of the gripping part in
whatever position or direction the motion or power for working the drill is applied.
The well-known pawl and ratchet wheel arrangement as is commonly used for
drilling and boring purposes, is defective in many respects viz.-back lash or slip,
uncertain grip and the like. Thus the back stroke of the propelling lever, in working
the pawl, often times brings its end upon the summit of a tooth, and thereby fails to
exactly catch or engage at the back of it. In such a position, no effect can be given
to the ratchet wheel.
In carrying out my present improvements, I take a wheel, with a plain and smooth
periphery, and at the rear of it, I dispose an inner clutch ended lever, with the clutch
part presented to the periphery of the wheel, and which said propelling lever is con-
nected to the wheel (which carries the drill holding socket) by opposite side plates
or links, connected together by cross pins which thus admits of the lover turning and
the wheel rotating, independent of the motion of the plates.
The clutch end of the propelling lever is curved to about the radius of the
wheel, and with the other part striking off to a tangent, or a line at right angles
to the axis of the lever; so that by moving the said lever or propelling handle
back, the curve becomes coincident with the periphery of the wheel, and has no
effect, but immediately the tangential or plain part comes against the wheel's
periphery, then a dead lock is made, thus compelling the lever and wheel to move
together, as if they were rigidly connected. By this means a sure intermittent
motion is obtained on the working of the lever.
The pin connections of the plates with lover and wheel respectively form centres
upon which the said said lever and wheel turn.
In some positions, the working of the wheel is not so effective as it might be,
and in order to ensure perfect working, I connect to the side of the lever a flat
or other spring whose free end forcibly bears upon the periphery of the wheel.
This spring counteracts the weight of the propelling lever, and ensures perfect
fulfillment of duty after much wear..
The spring also ensures perfect grip, should the parts of the brace be badly
made or badly fitted and further, it acts as a scraper for removing dirt or other
accumulations from the wheel.
Dated this Twenty seventh day of August 1888.
EORGE RICHARD POSTLETH WAITE
By Henry Skerrett,
Agent for Applicant.

page_text: 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 drill braces, and is an improvement upon Letters Patent
granted to me on the 12th day of September 1884 and numbered 12319.
The object of my present invention is for ensuring absolute action of the gripping
part in whatever position, or direction, the motion or power for working the drill
is applied.
The well known pawl and ratchet wheel arrangement as is commonly used for
drilling and boring purposes, is defective in many respects, viz.-back lash or slip,
uncertain grip and the like. Thus, the back stroke of the propelling lever, in working
the pawl, oftentimes brings its end upon the summit of a tooth, and thereby fails
to exactly catch or engage at the back of it. In such a position, no effect can
be given to the ratchet wheel.
In carrying out my present improvement, I take a wheel, with a plain and
smooth periphery, and at the rear of it, I dispose an inner clutch ended lever, with
the clutch part presented to the periphery of the wheel, and which said propelling.
lever is connected to the wheel (which carries the drill holding socket) by opposite
side plates or links, connected together by cross pins, which thus admits of the
lever turning, and the wheel rotating, independent of the motion of the plates.
The clutch end of the propelling lever, is curved to about the radius of the
wheel, and with the other part striking off to a tangent or a line at right angles
to the axis of the lever; so that by moving the said lever or propelling handle, back,
the curve becomes coincident with the periphery of the wheel, and has no effect,
but immediately the tangential or plain part comes against the wheel's periphery,
then a dead lock is made, thus compelling the lever and wheel to move together, as
if they were rigidly connected. By this means, a sure intermittent motion is obtained
on the working of the lever.
The pin connections of the plates with lever and wheel respectively, forms.centres.
upon which the said lever and wheel turn.
In some positions, the working of the wheel is not so effective as it might be,..
and in order to ensure perfect working, 1 connect to the side of the lever, a flat
or other spring, whose free end forcibly bears upon the periphery of the wheel.
This spring counteracts the weight of the propelling lever, and ensures perfect..
fulfillment of duty after much wear. The spring also ensures perfect grip, should
the parts of the brace be badly made, or badly fitted; and further, it acts as a scraper
for removing dirt or other accumulations from the wheel.
Figure 1 of the accompanying drawing represents in side elevation, a drill brace,
provided with an improvement, in accordance with my present invention.
Figures 2 represents a part vertical section, and part elevation of the said drill
brace, but with the end of the propelling lever, broken away.
Figure 3 represents a part horizontal section, and part elevation of the said ratchet
brace, with the lever in its gripping position.
Figure 4 represents the same, with the lever in its neutral or non-acting, position ;
that is to say, its position when a back stroke is being made.
a is a propelling lever, with a clutch or inner end a²; and with its face presented
to the periphery of a bardened steel collar or wheel 6, made tight upon, or in one
piece with the spindle c, with: drill holding socket d at one end, and a screw box e
at the other. end, wherein which latter, the feed screw takes.
The propelling lever is linkedly connected to the said spindle, by link like side
plates 9, whose outer ends take around the axis c, whilst their inner ends take around
a cross pin h.
The rear part of the acting-face a of the clutch end of the lever is curved to the
radius of the collar or wheel b, whilst the fore part a' is directed tangentially to the
said wheel, and forms the gripping part of it.
i is a flat spring, secured to the side of the lever, and with its free end; pressing

page_text: itself upon the periphery of the collar or wheel b, which thereby ensures perfect action
of the drill brace in all positions.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what
I claim is.
First. Ensuring perfect action and absolute grip of the clutch end of the propelling
lever of a drill brace, of the kind as herein described, by means of a flat or other
spring, as set forth.
a,
of a
Secondly. The combination with a spindle collar or wheel b, and handle
flat spring i, 2, whose free end takes its bearing upon the periphery of the said collar
or wheel, substantially as, and for the purpose as described and set forth.
Dated this 4th day of Now 1880
GEORGE RICHARD POSTLETHWAITE.
By Henry Skorrett,
Agent for Applicant.