Year: 1895

page_text: Date of Application, 23rd Jan., 1895
Complete Specification Left, 23rd Oct.. 1895-Accepted, 23rd Nov., 1895
I, FRANK WHITEHOUSE of 37, Constitution Hill, Dudley, in the County of
Worcester, Mechanic, do hereby declare the nature of this invention to be as
follows:-
My improvements in ratchet braces have for their object to provide a brace
for metal work which will drill a hole practically of any depth without it being
necessary to employ packing pieces for insertion between the head of the brace
and the arm of the clamp against which the brace bears.
'
In carrying out my invention instead of providing the head of the brace with
a single box which screws out on the screwed head of the spindle, whilst the
hole is being drilled, I provide the screwed head of the spindle with one or more
screwed thimbles in addition to the ordinary box head.
It will be seen that when the box head has reached its extreme travel on the
head of the screwed spindle, the screwed thimble, or thimbles, will then commence
to turn on the spindle and so obviate the necessity for packing pieces.
Birmingham, January 22nd 1895.
W. P. THOMPSON & Co.,
Agents for the Applicant.
I, FRANK WHITEHOUSE, of 37 Constitution Hill, Dudley, in the County of
Worcester, Mechanic 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 :—
My invention pertains to improvements in ratchet lever braces for drilling
purposes, and has for its object, a means, whereby a greater depth of hole can be
drilled without the aid of packing or distance pieces.
In ratchet braces, as usually constructed, it often happens that the feed or
means for setting up the drill are insufficient to allow of a good depth of hole
being drilled, and distance or packing pieces have to be inserted between the back
centre of the brace and the arm of the clamp against which it bears.
The use of such packing pieces or lifts are detrimental to the drilling of a true
hole, as the said packing pieces fly out of their respective positions and give
considerable trouble and annoyance to the operator.
Now my improvements consist in the employment of one or more screwed
thimbles or sleeves integral with the brace, and fitting and working one within the
other, or one over the other, in such a manner that the feed or set-up of the drill is
thereby extended.
Fig. 1 of the accompanying drawing represents in part section and elevation,
a ratchet brace constructed, arranged, and fitted with improvements according to
my invention. This figure illustrates a primary and secondary feed or set-up, the
primary one consisting of a hollow sleeve or box, the interior of which is
D

page_text: differentially wormed to take and work upon the outside wormed part of the brace
body and feed screw respectively, the latter constituting the secondary feed or
set-up.
Fig. 2 is a cross-section taken upon the chain line X, Fig. 1, whilst Fig. 3 shows
the primary feed-box or sleeve separately, but part of which is in elevation to
illustrate the hexagonal figure of its extension.
:
The name letters of reference indicate corresponding parts in the several figures
of the drawing.
a is a ratchet brace consisting of an outside wormed body part a', head a², having
an aunular collar a³, an outside screwed shank a*, and a drill or tool holder a³ having
a cone-shaped angular socket a for receiving and holding the drill in position.
d is a ratchet toothed wheel fitted and brought up fast to a stop shoulder a on
the screwed shank at, whilst d is a ratchet pawl jointedly carried on a cross pin e³,
passing through a bifurcated levering arm e loosely mounted on the annular
collar a³ as aforesaid, and on a plain part as of the wormed body part a', and which
said ratchet pawl d² is forced into the teeth of the ratchet wheel by a spring €³
carried by the said levering arm.
bis a hollow thimble, sleeve, or box, a part of whose interior is wormed or
screwed to take and work upon the outside wormed portion a¹, of the ratchet brace
body a, while the rear part 2 of the sleeve or thimble bis also formed into a screw
box 63, which receives or takes and works upon a long like screwed shank c¹ of a
screw c, provided with a head c², with holes c³ formed therein for the rotation, and
having adjacent thereto a conical seat or centre c' for its connection to a clamp.
The operation of the feed is as follows:-
:-
It is understood that the rotation of the drill is effected through the radial
movement of the levering arm, through the intervention of the pawl and ratchet
wheel. On cut or feed requiring to be put on the drill the hollow sleeve, thimble,
or box, is rotated by means of a spanner in the required direction at various
intervals until this, the primary feed, is almost exhausted, as shown in Fig. 1, when
the screw-pin c, constituting the secondary or extended feed, is rotated, and the
cut or feed to the drill continued.
It will be thus seen that in the act of drilling, and after the necessary feed
has been given, the whole of the parts of the brace move together as if rigid
between the acting part of the drill and the centre of the pin c.
I wish it to be understood that I do not limit myself to the number of sleeves
and pins, such as b and c, for extending the feed, as the working of any number
would be precisely the same.
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 1
claim is :-
1. In ratchet braces, extending the traverse or feed to the tool, by means of
wormed distance sleeves, thimbles, or pins, substantially as described and set forth.
2. In ratchet braces, extending the traverse or feed to the tool, by means of a
wormed sleeve and a screw pin c, both being arranged and fitted substantially as
described and set forth in Fig. 1.
'
3. In combination with a tool holder, a ratchet wheel, and parts for communi-
cating motion to the same, of a sleeve or thimble b and a screw-pin c, substantially
as described and set forth.
4. In ratchet braces, the arrangement, combination, and fitting of the parts as
set forth
Dated this 18th day of October 1905.
ɩ
W. P. THOMPSON & Co.,
Of 11, Burlington Chambers, Birmingham, Agents for the.Applicant.
W. P. THOMPSON & Co.,
Of 11, Burlington Chambers, Birmingham, Agents for the.Applicant.