A REVOLVING CUTTER HOLDER
Year: 1885

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We THOMAS MARR HOBSON, Cabinet Maker, and EWBANK HARRISON, Silver-
smith both of Darlington in the County of Durham do hereby declare the nature
of our invention for A REVOLVING CUTTER HOLDER to be as follows:-
A solid block of steel, iron, gunmetal, or any other hard metal, with one, two, 'or
more slots cut through its thickness, tapered on one or both sides as a dovetail
the steel cutters to be tapered to the same angle as dovetail in holder, so that when
driven gentley in they are held firm and tight, without the aid of screws ör bolts,
of any kind whatever.

page_text: We THOMAS MARR HOBSON, Cabinet Maker, of Wellington Place; and EWBANK
HARRISON, Jeweller, of 4 High Row, both in Darlington, in the County of Durham,
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 :-
Our invention for a revolving cutter holder has for its object to provide improved
means for securing the cutter blades to a holder capable of being mounted upon or
otherwise attached to a shaft by means of which it can be rotated.
In carrying this invention into practical effect, each cutter blade is secured in a
groove cut longitudinally in the circumference of a boss or block of metal capable
of being mounted upon or suitably attached to a shaft mounted in suitable bearings
so that it can be rotated. Each groove, cut in the boss or block, is, in cross section,
of dove-tail or other suitable form; that is to say, it is wider at the bottom of the
groove that at the top. The part of the cutter blade to be secured in the groove
is of a similar cross section to the groove and is driven gently into place and held
firm and tight without the aid of screws or bolts. The groove or the cutter blade
or both is or are preferably tapered very slightly in the direction of its or their length
so that the cutter blade when forced into position is firmly held in that position.
Fig. 1 is an end elevation of a cutter holder with four cutters; and Fig. 2 is an
elevation showing the holder inclined to the plane of projection.
The cutters a are secured in grooves b cut longitudinally in a boss or block of
metal C. As shown, one side 1 of each groove is at right angles to the bottom 2
and the other side 3 is inclined thereto so that the groove b is wider at the bottom
than at the top.
As shown, two of the cutter blades are capable of cutting when
the cutter holder is rotated in the one direction and the other two when the holder
is rotated in the opposite direction.
If desired the grooves in the boss or block C may be radial and the part of the
cutter blade within 'the groove may be inclined to the part without the groove.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. In a revolving cutter holder, securing the cutter blades in the holder by means
of grooves cut longitudinally in the circumference of the holder and having their
bottoms wider than their tops, the parts of the cutter blades to be secured in the
grooves being formed of corresponding shapes substantially as described.
2. The construction of a revolving cutter holder substantially as described and
shown.
ני
1000
WHEATLEY & MACKENZIE,
Agents for the Applicants.