An Improved Chuck, with Adjustable Cutters for Operating on Wood, Leather, or Ivory.
Year: 1895

page_text: Date of Application, 3rd May, 1895
Complete Specification Left, 23rd Aug., 1895-Accepted, 28th Sept.,
1895
PROVISIONAL SPECIFICATION.
An Improved Chuck, with Adjustable Cutters for Operating on
Wood, Leather, or Ivory.
I FREDERICK ERNEST HOFFMAN of 5 Percy Square, King's Cross Road,
London, Mechanical Engineer, do hereby declare the nature of this invention to
be as follows:-
This invention relates to an improved chuck with adjustable cutters for operating
on wood, leather or ivory.
For the purpose of my invention I form the face of a chuck plate with a series
of straight ret tangential grooves or slots into which knives or cutters can be
placed and be fixed when adjusted by an outside screw bolt and grip.
Each groove or slot terminates in a recess formed in the periphery of the chuck
plate.
The knives or cutters, have, on the surface nearest periphery of chuck the
desired pattern or shape, this pattern or shape being the whole length of cutter, so
that the cutting edge formed by grinding the end at an angle cuts the material to
the pattern of the cutters edge, if such cutter be other than flat, and the cutters
can be thus used up to the shortest piece that can be gripped and still retain its
pattern or shape for the full width.
The back of the chuck plate is capable of being screwed on to the chuck spindle
in the usual manner and removed by a reverse action.
The tangential grooves or slots in the front face of the chuck plate may be in
any desired number but I prefer 5 and are specially adapted for use with wood
moulding or planing machinery or in a machine for trimming the edges of boot and
shoe soles or in a profile machine for shaping articles in ivory.
The 3rd day of May 1895.
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said F. E. Hoffman.
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said F. E. Hoffman.
An Improved Chuck, with Adjustable Cutters for Operating on
Wood, Leather, or Ivory.
I, FREDERICK ERNEST HOFFMAN, of 5 Percy Square, King's Cross Road,
London, Mechanical Engineer, 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 an improved chuck with adjustable cutters for operating
on wood, leather, or ivory.
For the purpose of my invention, I form the face of a chuck plate with a series
of straight yet tangential grooves or slots into which knives or cutters can be
placed and be fixed when adjusted by an outside screw bolt and grip.
Each groove or slot terminates in a recess formed in the periphery of the chuck
plate.
The knives or cutters have on the surface nearest periphery of chuck the

page_text: desired pattern or shape, this pattern or shape being the whole length of cutter, so
that the cutting edge formed by grinding the end at an angle cuts the material to
the pattern of the cutters edge, if such cutter be other than flat, and the cutters
can be thus used up to the shortest piece that can be gripped and still retain its
pattern or shape for the full width.
The back of the chuck plate is capable of being screwed on to the chuck spindle
in the usual manner and removed by a reverse action.
The tangential grooves or slots in the front face of the chuck plate may be in
any desired number but I prefer 5 and are specially adapted for use with wood
moulding or planing machinery, or in a machine for trimming the edges of boot and
shoe soles, or in a profile machine for shaping articles in ivory.
My invention is represented at Figures 1 to 5 of the annexed drawings,
Figures 6 and being elevation and edge view of a key by which the screw bolt
and grip plate can be operated.
Figure 1 exterior elevation of my chuck complete.
Figure 2 face view of chuck body with grip plate removed.
Figure 3 inner face view of grip plate.
Figure 4 edge view of same.
Figure 5 end, face, and side views of one of my cutters.
A shank of chuck to be screw threaded or plain like ordinary chuck shanks, if
plain it is fixable to the lathe or other spindle by the pinch screw B.
C body or head of chuck with a flat face and with five tangential slots or
grooves D for the reception and adjustment of cutters E. These cutters are of
such length that when new the cutting edges are about level with the periphery
of the chuck's body, but from which they can be set projectingly to the desired
distance in proportion to the groove or channel to cut in the material to be
operated upon.
The periphery of the body at the termination of the slot D has recesses F
within and from which the cutting edges can be adjusted, the recesses enabling the
cut chips of material to clear themselves while the cutting progresses.
The cutters E are slightly wider than the depth of the slots D, so that they can
be pressed on and be fixed after adjustment by the grip plate G this being fixable
by the screw bolt H which enters the head C centrally and bears by its shoulder I
on the grip plate G. The head of the screw bolt H is shown square for the
corresponding hole J in the key K to take over for turning the screw bolt H in the
required direction to tighten up or to free the grip plate and the consequent fixture
or loosening of the cutters E.
One of the flat faces of each cutter can be grooved in their length, the other
flat face being plain from which side, the grinding and sharpening is effected to
preserve the pattern of the other face, if such face be to a pattern which it is
desired to give to the material under operation.
To obviate what little difficulty there might be in setting all the cutters with the
same amount of projection by hand, so that each one did its duty in cutting, I have
formed little studs Lone on the outer edge of each, and have formed slots M in
the inner face of the grip plate G into which said studs L engage in order that all
the cutters can be set outwardly, or be drawn inwardly to a corresponding distance
on the gripper plate being turned after the nip of the screw bolt H has been released,
this turning may be by hand because all the cutters E fit the slots to slide freely,
but I prefer to employ the key K for the purpose by forming its end N crescent
shape to ride against the shoulder I of the screw bolt H, and by fixing a pin P to
project from the shank, said pin engaging in a pin hole Q seen in dotted lines at
Figure 3 the hole being in the outer face, as at Figure 1.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare: that what I
claim is :-
1. The improved chuck in which cutters E arranged tangentially in slots'D can

page_text: be set or adjusted and clamped by a grip plate G as described, the parts being
combined as represented in the annexed drawings, Figure 1.
2. In a chuck of the description or form of construction shown on the drawings,
the employment of cutters each having throughout their length on one flat side a
pattern to be given to the article or material under operation, and having one
perfectly flat side, from the end of which the grinding and sharpening is effected to
preserve the pattern for cutting purposes, said cutters being capable of adjustment
from tangential slots in the chuck head and affixable by a grip plate as and in the
manner and for the purposes described and shown.
The 23rd day of August 1895
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said Frederick Ernest Hoffman.
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said Frederick Ernest Hoffman.