An Improved Mitre Cutting Machine.
Year: 1895

page_text: Date of Application, 6th Apr., 1895
Complete Specification Left, 14th Dec.. 1895-4ccepted, 18th Jan.,
1896
PROVISIONAL SPECIFICATION.
An Improved Mitre Cutting Machine.
I, THOMAS RIMMER, of 77 Shakespeare Street, Southport, in the County of
Lancaster, Joiner and Cabinet Maker, do hereby declare the nature of this
invention to be as follows:-
:-
In order to carry out my invention. I secure cutting blades at either end of an
oblong flat metal frame, which frame is longitudinally grooved on its upper and
lower inside edges, and is then fitted in tongued and grooved form to the front
outside end of the main frame or bed of the machine, (which is adapted for
attaching to a bench), so that it is free to slide backwards and forwards.
On the outside of this frame, and in the centre of the main frame, I fix a hand
lever, which is attached to the sliding frame, and by means of which the sliding
frame and cutters are actuated.
Immediately behind the sliding frame, and in the centre of the bed of the
machine, I place an upright partition, the two sides of which form a rest for the
material when being worked upon by the cutters.
The material is pushed through from the back, at either side of the upright
partition, and the working of the lever causes the blades to cut it.
In order to form a rest at different angles, I cut a longitudinal slot through the
bed of the machine, parallel with the sliding frame, and I fit a screw under the
bed, from each end, each screw reaching about half way across.
On each of these screws I place a nut or boss, one side of which projects upwards
through the slot in the bed, a sufficient distance for the material to rest against it,
and by working the screws, these nuts or bosses can be moved backwards and
forwards, so as to form, in conjunction with the centre partition, a rest for any
degree of mitre.
. הד
.
An Improved Mitre Cutting Machine.
I, THOMAS RIMMER of 77 Shakespeare Street, Southport in the County of
Lancaster, 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 that class of machines for cutting mitres which has
cutting blades, reciprocated by a handle the work being held in proximity to
them, at a suitable angle and has for its object to improve the construction thereof
as hereinafter more particularly pointed out
It is usual in such machines to provide adjustable fences or guides against
which the wood to be trimmed is held, and these are placed one at or near each
end of the bed of the machine

page_text: .
Fig. 1 is an elevation of my machine.
Fig. 2 is a plan, but shewing the knives at the centre of their stroke.
Fig. 3. is an end elevation.
Fig. 4. is a similar view to Fig. 3 but is drawn partly in section parts being
ommitted for clearness.
Fig. 5. is an enlarged detail of the guide clamping and adjusting mechanism.
A is the main bed of the machine preferably machined flat on top and having
flanges or lugs a for fastering to a table or bench.
B is a rectangular framing made in one with, or securely attached to the bed A,
and having its upper and lower edges wedge shaped in cross section and parallel,
as shown.
The edges of frame B form fixed guides for the knife carriage C which may be
reciprocated thereon by means of handle D actuating spur segment E moshing with
rack C¹ carried by carriage C. Handle D and segment E turn on a pivot e which
is flanged and fixed by means of nut el in a slotted bracket F depending from
main bed A. It will be noticed that the knife carriage C travels on the outside
of its guides instead of being enclosed between them as in machines hitherto in
use and this is an important feature of my invention.
The machine is more easily constructed, and a longer stroke is obtainable with
a given size of bed and guides.
C are the knives attached by bolts ³ to a plate C³.
To secure a good working fit between the carriage C and guides B 1 make a
portion of the top bar of the former a separate piece e somewhat after the manner
of adjustment employed in a slide rest and attach it by means of screws to said
carriage C.
This construction enables slack to be taken up and a steady and uniform cut
obtained. To hold the wood being trimmed at the angle required I employ
fences at each end of the machine. Part of my invention comprises the means
for locating and securing said fences in desired position. Each fence consists of
an upright piece G having a segmental base G which rests on the bed A, the
portion G being pivotted top and bottom in the inner edges of the guides B.
The base G is furnished with a set off edge g which is a segment of a circle
struck from the shearing edge of the fence. I provide clamping arm H pivotted
ath to the guides B. A stud I fixed to the main bed A. and having wing or
other nut enables arin H to be clamped down and hold fence G at desired angle.
A lug J on the underside of arm H rests against edge g and thus guides it in a
true circular path when being adjusted as regards angle, thus ensuring that the
shearing edge of fence G shall always be in the same relative position to the line
Arm H also carries stop pin K having spring k which tends to force it
into holes in bases G₁ which are so placed as to arrest guides G at the angles
of 45°, 60°, and 90°. A lateral lug riding in slot (see Fig. 5) enables the pin
to be kept in its raised position by a slight 'turn. I am aware that spring stops
have been employed before for a similar purpose, but as far as I know these have
always been carried by and movable with the fences and made to enter holes in
the main bed of the machine and I consider it an advantage to make the holes in
the fences and leave the main bed intact, as mistakes or adjustments may be more
easily rectified and made when necessary.
of cut.
Having now particularly described and ascertained the nature of my said iuven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. A mitre cutting machine such as described having a knife carriage recipro

page_text: cating on guides formed on the outer edges of its supporting frame substantially
as described.
2. In a mitre cutting machine the fences G having bases G₁ which carry set off
edges 9 said edges being segments of circles struck from the shearing edges of
said guides, in combination with pivotted clamping arms, means for locating said
fences and for clamping them at the desired angles all arranged substantially as.
described and shown.
Dated this 13th day of December 1895.
CHARLES COVENTRY,
Patent Expert, Agent for the Applicant..