Improved Tool Holder and Tool for use in Cutting Key-ways in Brackets, Wheels, Pulleys, and the like.
Year: 1890

page_text: Date of Application, 3rd Dec., 1890
Complete Specification Left, 27th May, 1891-Accepted, 27th June, 1:91
PROVISIONAL SPECIFICATION.
Improved Tool Holder and Tool for use in Cutting Key-ways in
Brackets, Wheels, Pulleys, and the like.
JOSEPH CARTER THOMAS CARTER trading as Carter Bros. Engineers Mill-
wrights and Tool Makers Bridge Street Iron Works Bridge Street Rochdale do
hereby declare the nature of this invention to be as follows:-
The improved tool holder and tool is designed specially for use in the slotting
machine and consists of a square bar of mild steel said bar being bored up at one end
taper and to the required distance and the cutting tools which are made of
different widths are made with a shank end said shanks are also turned taper in
order to fit the taper hole in the bar or tool holder the said cutting tools have a
small pin or stud fixed in there is also a fixed pin or stud in the bar or tool holder,
these are connected by a spiral spring which holds the cutting tools firmly in
position when commencing the cutting or downward stroke and also relieves the
drag or rubbing in the return or upward stroke of the machine thereby preserving
the cutting edge of the tools.
On the shank of the cutting tools is cut or filed a small recess, and through bar
or tool holder is fixed a stud said stud also going through recess of cutting tool
thereby holding it squarely in position.
Dated this 2nd day of December 1890.
JOSEPH CARTER.
THOMAS CARTER.
COMPLETE SPECIFICATION.
Improved Tool Holder and Tool for use in Cutting Key-ways in
Brackets, Wheels, Pulleys, and the like.
We JOSEPH CARTER & THOMAS CARTER both of Bridge Street Iron Works
Rochdale in the County of Lancaster Engineers 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 tools for cutting metal and used in connection with
slotting machines but more particularly to such class of tools adapted to yield or
deflect when pressure or a rubbing action occurs at the cutting edge a tool of which
class forms the subject of prior Letters Patent granted to us being numbered 12,485
and dated August 7th A.D. 1889.
According to the construction of the tool forming the subject of the aforesaid
Letters Patent the same is arranged to swivel or move about the axis of a fixed
pin or support but according to our present improvement and arrangement we
dispense with the fixed stud whereby we are enabled to utilize or use up the material
forming the tool to a greater extent than is the case with the invention the subject
of the aforesaid Letters Patent as the shank portion of the tool of the said
invention must evidently be useless as a tool when the face or cutting portion
thereof is worn away by use also the subject of our present improvements can be
manufactured more economically as to cast than our former invention.
As in the case of our former invention the present arrangement also admits of
key ways being slotted or cut in holes of small diameter.
In order that a clear understanding of our invention may be had we have here-
unto annexed a sheet of drawings shewing three figures illustrating the details of
the said improvements.

page_text: .
grepresents a front elevation.
Fig. 2 represents a side elevation.
Fig. 3 represents a side elevation in section shewing the tool detached from the
holder.
According to our construction the tool holder consists of a bar of metal a which
we term the holder, the holder is provided at its lower extremity with an aperture
or hole-bored out cone or taper shape in a lengthwise direction of the holder we
form in the tool a shank of a shape corresponding to the form of the aperture
which shape is turned or shaped by means of a lathe we insert the shank loosely
within the aperture the said tool is retained in position the shank being seated in
the aperture and the part or portion about the base of the shank is caused to abut
against the holder by means of a spiral coil or spring-connected at its one end to
a projection or pin provided on the tool its other end attached to a fixed stud-pro-
vided on the holder a convenient part of the shank is recessed see Fig. 3 at or near
which part is situate a pin so as to allow the tool to descend when the cutting edge of
the tool is in contact or engages with the work during the period of withdrawal of
the tool therefrom but at the same time to prevent a deviation from. its. true or
cutting position when the shank of the tool is withdrawn from its seat thus by the
aid of the pin-the tool may be maintained true or square to its work..
When in use the bar or holder is secured in. the ordinary, manner within the tool
box or slot of the sliding bar of the machine by the ordinary means-which are
well known.
1.
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. The combination of a tool holder a having a recess of conical or taper form
with a tool chaving a shank c¹ of corresponding form in which recess the said
shank when the tool is in the act of cutting shall be seated therein but in the event
of contact with the cutting edge and the work during the return stroke or period
of withdrawal of the tool therefrom the shank shall be capable of unseating and
whilst in an unseated position the tool shall be held and maintained square to or in
its normal cutting position to the cut or work, a pin g and a spiral coil or spring d
substantially as and for the purposes herein fully set forth.
2. The combination of the shanked tool c recessed at the part in contact with
the stay ping with the said stay pin substantially as described.
3. The tool having a conical or taper shank adapted to fit or seat within a recess
in a holder or bar affixed to a slotting machine.
Dated this 25th day of May A.D. 1891.
....
JOSEPH CARTER.
THOMAS CARTER.