IMPROVEMENTS IN TOOL-IIOLDERS
Year: 1882

page_text: LETTERS PATENT to John Franklin Allen of the City of Brooklyn in the
State of New York in the United States of America. for an Invention of
"IMPROVEMENTS IN TOOL-IIOLDERS
"
COMPLETE SPECIFICATION filed by the said John Franklin Allen at the
Office of the Commissioners of Patents on the 8th November 1882.
JOHN FRANKLIN ALLEN, of the city of Brooklyn, in the state of New York in
the United States of America "IMPROVEMENTS IN TOOL-HOLDERS."
This Invention relates to a device for holding an independent cutting-tool in a
holder and aims at the utmost simplicity of structure.
The Invention consists in combining with the shank or holder, fitted to receive
the cutting-tool in a suitable opening, the cutting-tool and a wedge, fitting by
means of corresponding irregular surfaces into each other so as to prevent the
movement of the tool and perfectly secure and fasten the same through the wedge
into the holder..
In order to explain this Invention as completely as possible I now proceed to
describe the best means I am acquainted with for carrying the same into practical
effect reference being had to the accompanying sheet of Drawings hereunto annexed
and to the Letters of reference marked thereon.
Invention.―
Fig. I. represents a side view of a tool-Holder attached embodying my
Fig. II. is a longitudinal section of the same.- Fig. III. is a top view of the same.
arranged with the tool central.-Fig. IV. is a top view of the same arranged for a
right-handed tool. and Fig. V. is a top view of the same arranged for a left-handed
tool.
Similar Letters of reference represent similar parts.
A. is the Tool-holder of proper size and shape to fit the Tool-post.-B, is the
cutting-tool made of suitable steel, which needs only to be ground properly at the
point in the proper form for the desired use.-A hole D or mortise corresponding
with the cutting-tool is cut through the holder A at any preferred angle with the
axis of the holder.-Behind this hole or motise D for the cutting-tool a wedge-
shaped hole or mortise E is provided in the tool-holder, narrower than the hole D

page_text: for the cutting-tool into which a Wedge C is fitted.-When the cutting-tool is put
into the tool-holder, whether made square or round, the back of said cutting-tool
must be made straight or flat for a width corresponding with the width of the
wedge C
The cutting-tool B being inserted into the tool-holder A projecting the proper
distance above its top surface and the wedge C being then driven home the friction
between the surface on the back of the cutting tool and the face of the wedge will
for light work and when the depth of the head of the tool-holder is of any
considerable size be generally sufficient to hold the cutting-tool perfectly firm.
For greater security and very heavy work I provide the rear-side of the cutting
tool B with notches or regular teeth a and the face of the wedge C with
corresponding notches or teeth which will interlock with those in the cutter and
prevent any longitudinal movement.
To disengage the cutting tool from the Holder a slight blow against the underside
of the cutting-tool will start the same and the wedge C upwards when the cutter
and wedge can easily be removed.
I am aware that a clamping piece secured by means of a pin-or-bolt-has-been
arranged at the back of the cutter and interlocked with the same. by means of
teeth, but by my invention I dispense with all pins or bolts for the purpose of
fastening either the tool or clamping piece and obtain thereby the utmost
simplicity of structure not-surpassed by any other device.
Having now fully described-and-set-forth-my-Invention and the manner of
performing the same I wish it understood that I claim =
A shank or tool-holder A-fitted to receive the cutting-tool-B-in-combination with
the wedge C, the said wedge C and back of the cutting-tool B being either straight
-or-provided with corresponding notches or teeth-a-so-as to interlock,-substantially
In presence of
HENRY E ROEDER
304 Broadway. New York.
JOHN FRANKLIN ALLEN
(LS.)