Improvements in and relating to Mitering or Beveling Machines for Wood Working.
Year: 1891

page_text: Date of Application, 9th Jan., 1891-Accepted, 7th Mar., 1891
COMPLETE SPECIFICATION.
Improvements in and relating to Mitering or Beveling Machines for
Wood Working.
I, WILLIS JAY PERKINS, a Citizen of the United States of America, residing
at Grand Rapids, in the County of Kent and State of Michigan, one of the United
States of America, Manufacturer, do hereby describe 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 :-
The improvements are in the peculiar movement imparted to the knife; and in
the lever connections, work rest, fence, and other parts of the machine.
Figure 1 is a front perspective view of the machine.
Figure 2 is a rear elevation.
Figure 3 is a broken top plan of one end of the machine.
Figure 4 shows details of the knife operating lever and handle.
Figure 5 is a rear elevation of part of machine with a modified knife-operating
lever.
_A, represents the table of the machine which forms a basis of support for the
other parts. The rear fence of the table, A, has a curved track or guide way, B,
preferably cast integral with the table, the same being in the form of an arc, or
arch, the arch springing from a plane some distance below the table, and rising
nearly to the level of the table.
Standards, C, C, one at each rear corner of the table, are firmly secured to said
table, and these standards are united at the top of a curved bar, D, which bar may
be integral with the standards.
Bar, D, has a curved track, E, at its underside, said track being on a curve con-
centric with the track, B, and substantially over the same. A handle, F, is attached
to the top bar, D, for convenience in carrying the machine.
A knife carrier, G, has its top and bottom faces curved to correspond with the
curved tracks or ways, B, and E, and of reverse shape at the top and bottom of
said tracks so as to slide between said tracks, which tracks serve as a guide for the
movement of the knife carrier. The edges of this knife carrier are inclined from
the perpendicular, say to an angle of about 45 degrees. The track, B, is a little
below the level of the top of the table, A, and in rear thereof, so that the knife
carrier, G, can move in a curved path or way formed by the tracks just in the rear
of said table, rising as it reaches the centre of the arch and falling toward each end,
but always keeping its edge in a plane parallel with the edge of the table--such
being a vertical plane when the machine stands upright.
Knives, H, H, are securely bolted to the carrier, Ğ, the bevel of the knives being
on the rear thereof. The edges of the knives are thus brought close to the rear
edge of the table, A, and in the movement of the knife carrier will make a shear cut
past said edge, one knife facing one way and the other in opposite direction.
The knives, H, are supported at their unsharpened edges by a triangular piece, I,
which is screwed to the face of the knife carrier, G. This gives a very firm support
to the cutting knives. As the knives are ground away they can be set forward on
the carrier, G, by means of bolts, K, passing through slots, L, in the carrier, and
by moving piece, I, downward a solid bearing for the knives will still be maintained.
At each end of the machine there is a pivoted fence, M.. These fences are sup-
ported on pivots, O, at the top, and said pivots being journaled in lugs, P, projecting
from the top rail, D. The lower ends of the fences are off-set, and have pivots, Q,
below the top of the table, and directly under the pivots, O.

page_text: The rear corner of each fence, M, is directly beneath the centre of pivot, O, and
above the centre of pivot, Q, and as the fence may be swung on these pivots (see
dotted lines Figure 1), the rear corner will remain in alignment with the rear edge
of the table, A, and the cutting edge of the knife.
The fences may be swung on their pivots, and secured at any angle within the
limit of their movement by clamp screws, R, which pass through holes in the fences
and slide into slots, S, in usual manner. The slots, S, in the table are preferably
curves struck from the pivotal centre of the fences.
A gauge rest, T, may be attached to the clamps, R, of the fence. The gauge rest
is preferably a curved slotted bar, and the clamp screw passes through the slot.
The gauge rest can be pushed back out of the way, or may be turned in as
in Figure 3, to give a support to a piece on the table, A, in a position beyond that
to which the fences can be swung.
A piece of work to be mitred can be held on the table and close against one of
the fences, the end to be trimmed projecting rearward beyond the edge of table, A.
Then the knife is drawn along in its curved path toward the work, and operates on
said work with a draw cut, all the time tending to crowd the work firmly down on
the bed and sidewise against the fence, the edge of the knife in its continued move-
ment shearing past the rear edge of both table and fence.
Of course it will be understood that opposite bevels may be trimmed at opposite
ends of the machine.
To give the peculiar swing to the knives I have arranged a special lever system,
as follows:
At the rear of the knife carrier I place a strong stud, U, which passes through
a hole, V', in lever, V. This lever, V, has a toothed segment, V2, at its upper
end, and a slot, W, near its lower end. The slot W, embraces the sides of the
fulcrum (which may be an anti-friction roll) X, firmly supported on the base
of the table, A, below the lower track, B, and projecting a little in rear of said
track.
A handle a, has a boss b, at one side, and a forked end, c. The fork, c, may
be slipped over stud, U, where it projects at the rear of lever, V. The boss, b,
will then enter between two of the teeth of the segment, V2. The handle, a, may
thus be adjusted at any angle with relation to the lever, V, and is easily remov-
able by lifting.
When the handle, a, is swung to one side, it swings lever, V, on fulcrum, X,
and lever, V, moves the knife carrier by means of the stud, U. As the fulcrum, X,
is not at the centre of the arcs formed by the curved tracks, the lever, V, will
shift lengthwise on the fulcrum, X, giving a lost motion between the power and
work, but one side or the other of the slot, W, will have a bearing on said fulcrum.
Instead of a single fulcrum, X, two fulcrums, X¹, X', may be provided, and
the lever, V, may be forked, as in Figure 5; then one of the slotted forks may
be in engagement with its fulcrum while the other fork rocks out of engagement.
A great advantage of this machine is found in the peculiar drawing cut, pro-
duced by moving the knives in the arc of a circle while standing at an angle
with relation to the work.
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 I
claim is :-
1. The combination and general arrangement of the table and arched knife way
and knife travelling in said way with its edge parallel with the table edge.
2. The combination and general arrangement of the table and the curved knife
way, and the knife with inclined edge and knife carrier moving in the knife way.
3. The general arrangement of the table and curved knife way, and the knives
on a carrier with a bracing block between the knives.

page_text: 4. The combination and general arrangement of the table and the curved knife
way, and the fence swinging with its corner in line with the edge of the knife.
5. The arrangement of the table and knife way and knife, and the fence and its
clamp, and a movable gauge held by said clamp.
6. The general arrangement of the table and its ways and carrier and knife, and
the knife moving lever having variable leverage.
7. The combination and general arrangement of the table and its guide ways,
carrier, and knife, and the knife moving lever having variable leverage, and the
handle adjustable to various angles with respect to the knife.
Dated this 9th day of January 1891.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.