Year: 1889

page_text: Date of Application, 1st Mar., 1889
Complete Specification Left, 28th Mar,, 1889
Complete. Specification Accepted, 18th May. 1889
ZINA COLTMAN 18ª Church Gate Loughborough Leicestershire Engineer do
hereby declare the nature of this invention to be as follows:-
My invention relates to machinery or apparatus, for slotting, keyseating & similar
operations, & it is applicable to machines working either horizontal or vertical.
The object of my invention is to remove the pressure of the cutting tool, from
the work, automatically during that period of its stroke when it is not cutting, thus
reducing the wear & tear on the tool & dispensing with such frequent grinding of
the cutting edge.
I carry out my invention in the following manner-The bar which carrys the
cutting tool is jointed & the edges are bevelled in such a manner, that if the tool
on its return stroke touches the work, it compresses a small spring fixed in the har,
which allows, the loose piece & consequently the tool fixed in it to fall away from
the surface being cut, thus leaving the tool out of contact.
My invention will be clearly understood by reference to the annexed drawings.
Fig. 1 is an elevation. Fig. 2 an end view & Fig. 3 shows the position of the loose
piece on the up stroke. B. is the bar which receives a reciprocating motion from
any suitable means. C is the loose piece which carries the cutting tool D jointed by
the pin E. shows the position of the loose piece on the up stroke. F is the
spring which presses the loose piece towards its work on the down stroke. G is
the clearance between the bar & the loose piece.
Dated this 98th day of February 1889.

page_text: I ZINA COLTMAN of 18A Church Gate Loughborough in the County of Leicester 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 relates to machinery & apparatus for slotting keyseating & similar
operations & is applicable to machines working vertical or horizontal. The object of
this invention is to remove the pressure of the cutting tool from the work during that
portion of the stroke when the tool is not cutting, enabling work of a superior quality
to be produced & at a greater speed. Figs. 1 & 2 (of drawings left with provisional
specification show this invention. B is the tool har which receives a reciprocating
motion from any convenient source. The loose piece C in which the cutting tool is
fixed is jointed to the bar B. by any convenient method. The loose or jointed piece C
has the top edges bevelled or cut away as shewn at G. A small spring F or similar
suitable means presses the loose piece towards its work. If in the return stroke
the cutting tool D. touches the work it compresses the spring F & allows the jointed
piece C to fall into the position ("allowing the tool to clear the work being operated
upon.
Having now particularly described & ascertained the nature of my said invention
& in what manner it is to be performed 1 desire it to be understood that I do
not bind myself to the exact details as herein set forth, but what I claim as
my improvements in slotting key seating & similar machinery are :—
1st. The method of jointing the bar carrying the cutting tool substantially as set
forth with reference to Figs. 1 & 2 of drawings left with Provisional Specification.
2nd. The method of cutting or bevelling the edges of the loose piece to allow it to
fall away from the work in operation substantially as herein before described with
reference to Figs. 1 & 2.
3rd. In conjunction with the two above claims the method of using a spiral spring
or similar means to press the loose piece towards its work substantially as herein
before described with reference to figs. 1 & 2.
Dated this 27th d
CM1 1000