Year: 1899

page_text: We, THE STEEL NUT AND JOSEPH HAMPTON LIMITED, of Franchise Street,
King's Hill, Wednesbury, in the County of Stafford, Manufacturers, and SAMUEL
HAMPTON, of Hollydene, Walsall Road, King's Hill, Wednesbury aforesaid,
Works Foreman, do hereby declare the nature of this invention to be as follows:-
The said invention consists of the improvements hereinafter described in mitre
cutting machines whereby greater truth or accuracy is ensured in mitres cut by
the machine than is attainable by the use of machines of the ordinary construc-
tion.
In order that the said invention may be the better understood we remark
that mitre cutting machines as ordinarily constructed consist essentially of a
jointed arm of short radius hereinafter called the cutter arm, to the inner face
of which the cutter blade or knife is fitted, the said cutter blade or knife working
against a vertical slotted frame through which the moulding to be cut is passed.
The inner face of the cutter arm bearing on the cutter blade or knife is accu-
rately planed or machined and the face of the vertical slotted frame described
is also accurately planed or machined. The parts are secured together by the
screw nut on the joint pin of the cutter arm. A downward extension of the
cutter arm bears against a guiding quadrant below the joint on which the cutter
arm turns. By the screwing up of the screw nut on the joint pin there is a
tendency to spring the cutter blade or knife from the planed or machined face
of the frame. Further, unless great care is exercised by the person using the
machine the knife or blade may be further removed from its true bearing against
the working face of the frame with the result that the mitre cut by the machine
is more or less untrue.
In constructing a mitre cutting machine according to the invention constituting
the subject of our application, we dispense with the downward extension of the
cutter arm herein before referred to and joint the said arm to the bottom of the
vertical frame so as to give the cutter arm a greater radius or sweep than the
ordinary cutter arm. We also dispense with the machining or planing of the inner
face of the said arm bearing on the knife or blade. The upper end of the cutter
arm is cranked or bent at right angles and passes through a quadrant shaped slot
at the top of the vertical frame of the machine. The cutter blade or knife, which
has the usual slot for taking on a rib on the inner faoe of the cutter arm, is
made to bear forcibly against the working face of the frame by a screw pin taking
in the cranked part of the cutter arm. forcing a washer to bear against the
inner face of the frame which face is planed or machined. The cutter blade or
knife is made to bear evenly on the working face of the frame by four set screws
passed through the cutter arm, the inner ends of which set screws hear on the
outer face of the cutter blade or knife and press it accurately against the planed
or working face of the frame. The jointed cutter arm is worked in the ordinary

page_text: way by a removable handle inserted in a socket in the face of the said cutter
arm.
By dispensing with the lower extension of the cutter arm a greater radius
or sweep may be given to the cutter arm with advantage to the action of the
knife or cutter blade on the moulding under operation.
The frame is provided with the usual inclined cheeks and the base plate with
a stud against one or other of which cheeks and stud the moulding under opera-
tion bears. The stud at the middle of the base plate is made preferably angular
for the moulding to seat itself against.
An adjustable clamp may be combined with the vertical frame of the machine
by means of which clamp the moulding may be firmly secured to the table or
bed of the machine during the operation of the mitre cutter upon the said mould-
ing.
By the construction and arrangement of parts described the springing or
accidental movement of the cutter blade from the planed or working face of the
frame is effectually prevented and accuracy in the mitre cut ensured.
Improvements in Mitre Cutting Machines.
We, THE STEEL NUT AND JOSEPH HAMPTON LIMITED, of Franchise Street,
King's Hill, Wednesbury, in the County of Stafford, Manufacturers, and SAMUEL
HAMPTON, of Hollydene, Walsall Road, King's Hill, Wednesbury aforesaid,
Works Foreman, do hereby declare the nature of the said invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
The said invention consists of the improvements hereinafter described in mitre
cutting machines whereby greater truth or accuracy is ensured in mitres cut by
the machine than is attainable by the use of machines of the ordinary construc-
tion.
In order that the said invention may be the better understood we remark
that mitre cutting machines as ordinarily constructed consist essentially of a
jointed arm of short radius, hereinafter called the cutter arm, to the inner face
of which the cutter blade or knife is fitted, the said cutter blade or knife working
against a vertical slotted frame through which the moulding to be cut is passed.
The inner face of the cutter arm bearing on the cutter blade or knife is accu-
rately planed or machined and the face of the vertical slotted frame described
is also accurately planed or machined. The parts are secured together by the
screw nut on the joint pin of the cutter arm. A downward extension of the
cutter arm bears against a guiding quadrant below the joint on which the cutter
arm turns. By the screwing up of the screw nut on the joint pin there is a
tendency to spring the cutter blade or knife from the planed or machined face
of the frame. Further, unless great care is exercised by the person using the
machine the knife or blade may be further removed from its true bearing against
the working face of the frame with the result that the mitre cut by the machine
is more or less untrue.
In constructing a mitre cutting machine according to the invention constituting
the subject of our application, we dispense with the downward extension of the
cutter arm hereinbefore referred to and joint the said arm to the bottom of the
vertical frame so as to give the cutter arm a greater radius or sweep than the

page_text: ordinary cutter arm. We also dispense with the machining or planing of the inner
face of the said arm bearing on the knife or blade. The upper end of the cutter
arm is cranked or bent at right angles and passes through a quadrant shaped slot
at the top of the vertical frame of the machine. The cutter blade or knife, which
has the usual slot for taking on a rib on the inner face of the cutter arm, is
made to bear forcibly against the working face of the frame by a screw pin, taking
in the cranked part of the cutter arm, forcing a washer to bear against the
inner face of the frame, which face is planed or machined. The cutter blade or
knife is made to bear evenly on the working face of the frame by four set screws
passed through the cutter arm, the inner ends of which set screws bear on the
outer face of the cutter blade or knife and press it accurately against the planed
or working face of the frame. The jointed cutter arm is worked in the ordinary
way by a removable handle inserted in a socket in the face of the said cutter
arm.
By dispensing with the lower extension of the cutter arm a greater radius
or sweep may be given to the cutter arm with advantage to the action of the
knife or cutter blade on the moulding under operation.
The frame is provided with the usual inclined cheeks and the base plate with
a stud against one or other of which cheeks and stud the moulding under opera-
tion bears. The stud at the middle of the base plate for the moulding to seat
itself against is either cylindrical or angular.
An adjustable clamp may be combined with the vertical frame of the machine
by means of which clamp the moulding may be firmly secured to the table or
bed of the machine during the operation of the mitre cutter upon the said mould-
ing.
Figure 1 of the accompanying drawing represents in front elevation and
Figure 2 in side elevation (partly in section) a mitre cutting machine made
according to the said invention; Figure 3 is a sectional plan of the same, the
said section being taken on the dotted line x, x Figure 1; Figure 4 is a section
of the knife or cutter and cutter arm, the said section being taken on the dotted
line
y, y Figure 1.
Figure 5 represents an elevation of the inner side of the knife and cutter
arm and Figure 6 represents the same partly in side elevation and partly in
vertical section; Figure 7 is a vertical section of a portion of Figure 2, showing
the method of securing the upper end of the cutter arm to the vertical face of
the frame.
r
Figure 8 represents in front elevation and vertical section the knife or cutter
blade detached.
:
Figures 9 to 12 both inclusive represent a modified arrangement of the said
invention hereinafter described.
The same letters of reference indicate the same parts in the several figures of
the drawing.
aa, a is the frame of the machine, a being the vertical face against which
the cutter arm 6 works and a¹ being the downward extension of the said face a
at the bottom of which downward extension a¹ the cutter arm bis pivotted by
the pin c.
a is the horizontal base of the frame which is fixed by screws to
a table or work-bench. The said horizontal base a has a projecting cylindrical
stud das represented. Or in place of the said cylindrical stud d, a triangular
stud may be employed as indicated in dotted lines in Figure 3.
In the vertical face a of the frame is the cross slot or opening e through which
the end of the moulding or the like to be mitred is made to project, the sides e², e²
of the said slot being at an angle of 45 degrees with the front of the machine.
At the top of the vertical part a of the frame is a curvilinear slot f the radius
of the curved slot f being that of the length of the cutter arm b. The cutter
arm carries the double edged knife i the said knife having the usual slot
at its middle (see Figure 8) for taking on the projection b¹ on the inner face of
the said aim (see Figures 5 and 6). "The knife is preserved in close contact

page_text: with the planed or machined front face of the frame a by set screws k, k, k, k
passing through lugs on opposite sides of the cutter arm b. The upper end b
of the cutter arm b is cranked and takes and works in the curvilinear slot f, a
screw pin 9 passing through a washer h at the back of the slot f (see Figure 7)
taking in the cranked part 62 and thereby preventing the cutter arm b from
partaking of any but a true curvilinear motion across the face of the vertical
part a of the frame. The back of the curvilinear slot f and the face of the
washer working on the same, are preferably machined.
in.
The cutter arm 6 has the usual socket 63 for the handle of the machine to take
By the construction and arrangement of parts described the leverage of the
cutter arm is increased and the springing or accidental movement of the cutter
blade from the planed or working face of the frame is effectually prevented and
accuracy in the mitre cut ensured.
In the modified arrangement represented in Figures 9 to 12 both inclusive
the usual vertical slot in the knife, best seen in Figure 8, and projection 62 on
the cutter arm b, best seen in Figures 5 and 6, for engaging the said slot, are
dispensed with and the knife supported on plain or unscrewed reduced ends
formed on the screws k (see Figure 11) which plain reduced ends take in holes
in the said knife. The shoulders at the junction of the screwed parts of the
said screws with the plain reduced ends bear on the knife and keep it in close
contact with the planed or machined front face of the vertical part a of the
frame.
We have represented and prefer to employ with the modified arrangement last
described a knife or cutter blade i made in two halves so that should one edge
of the knife be injured it is only necessary to remove and replace one of the
half knives but we wish it to be understood that the modified or supporting
screws k, represented in Figures 9 to 12 both inclusive are applicable where
a double edged or single knife is employed.
Although we have described and represented the set or adjusting screws k, k
and modified set or adjusting screws k, k, by which the cutter blade or knife is
made to bear on the planed or machined face of the vertical part a of the frame,
thereby rendering unnecessary the planing or machining of the inner face of
the cutter arm, only in connection with our improved mitre cutting machine we
wish it to be understood that the said set or adjusting screws may be used in
connection with ordinary mitre cutting machines for the purposes hereinbefore
described.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that we
claim as the said invention of "Improvements in mitre cutting machines":-
First Pivoting the cutter arm to the bottom of the downward extension of
the vertical part of the frame of the mitre cutting machine and making an
inward projection or cranked part on the upper end of the said cutter arm for
taking and working in a curvilinear slot at the top of the vertical part of the
frame substantially as herein before described and illustrated in the accompanying
drawing.
Secondly; Combining with the jointed cutter arm of mitre cutting machines,
a series of set or adjusting screws for preserving the knife or cutter in close contact
with the planed or machined face of the vertical part of the frame and thereby
obviating the necessity for machining the inner face of the cutter arm sub-
stantially as herein before described and illustrated in the accompanying drawing.
Thirdly; The modified arrangement of the said invention herein before
described and illustrated in Figures 9 to 12 both inclusive of the accompanying
drawing in which modified arrangement the set or adjusting screws are pro-
vided with plain reduced ends for carrying the cutter blade or knife the shoulders
on the said set or adjusting screws preserving the knife in contact with the

page_text: planed or machined face of the vertical part of the frame, whether the said
set or adjusting screws be used with a single or double edged knife or a knife
in two halves substantially as herein before described and illustrated.
Dated the Twenty-second day of December 1899
THE STEEL NUT AND JOSEPH HAMPTON LD,
W. C. GARMAN,
H. P. NICKLI N,
Directors.
SAMUEL HAMPTON.