IMPROVED MACHINE FOR CUTTING SHIVES
Year: 1881

page_text: LETTERS PATENT to Edward John Heal, of Chenies Place, Old Saint Pancras
Road, in the County of Middlesex, for an Invention of "IMPROVED MACHINE
FOR CUTTING SHIVES."
PROVISIONAL SPECIFICATION left by the said Edward John Heal at the
Office of the Commissioners of Patents on the 7th October 1881.
EDWARD JOHN HEAL, of Chenies Place, Old Saint Pancras Road, in the County
of Middlesex, IMPROVED MACHINE FOR CUTTING SHIVES."
"
This Invention has for its object an improved machine for cutting shives.
The machine, constructed according to this Invention, is intended to fit on to the
mandrel of a lathe, and consists of three or more cutters arranged horizontally in a
small cylinder; this cylinder is fitted with a piston against the back of which acts
a spring; to the front of this piston is screwed or otherwise suitably fixed a disc
having staple pieces on the periphery to hold the cutters in position. The aforesaid
disc is made capable of being detached so that either a larger or a smaller one may
be fitted according to the size of shives it is desired to cut. By this means various
sized shives may be cut by the same machine. For cutting shives with this
improved machine it is screwed on to the mandrel of a lathe, and the wood out of
which the shives are to be cut is brought against the cutters by any suitable means,
and the wood thus forces the aforesaid disc back and expands the cutters, thereby
cutting the shive with the desired cone, and upon releasing the pressure on the
wood the shive drops down by the return action of the disc and a fresh surface of
wood is brought against the cutters to cut another shive, and so on.

page_text: Fig. 1 shews a longitudinal section of the machine or tool.
Fig. 2 shews and view looking on bead thereof.
Fig. 3 shews section on line X, X, shewing the cutting tools in position.
A shews the stem of machine with female screw B to screw on to the mandril of
a lathe or machine; C is a hollow cylinder in which works the plunger D, at the
back of which is placed the spring E to keep the said plunger in position. The
plunger D is prevented from coming out of the cylinder C by the set screw a being
screwed in alot b of the plunger.
On the end of plunger D is fastened cap F which guides the outer ends of the
cutters G, as hereafter described, by means of lugs c shewn in Fig. 2; this cap also
carries a small bevilling cutter d. The cutters C are fastened into slots g in the
stem A by the screws e in outer casing F, see Figures 1 and 3, the whole being
secured together by cap fixed to casing H. The action is as follows:-
The machine or tool being screwed on to the mandril of a lathe, the wood from
which the shive is to be cut is pressed against centre fand cutters G, which latter
enter the wood, and as they cut into the wood the cap F on the plunger D is
pressed in, and the cutters being set at an angle are opened out by the cap F
sliding on them, thus producing a tapered shive. When the cutters have entered
the wood the bevilling cutter d takes off the burr formed by cutters G, and when
the thickness of the wood has been cut through the shive falls out completed. In
order to form shives of a different size, it is only necessary to change the cap F for
a larger or smaller one as desired.
Having thus described and ascertained the nature and object of my said
Invention, and the manner of carrying the same into practical effect, I would
remark in conclusion that what I claim as my Invention, and desire to securo by
the herein before in part recited Letters Patent is, the machine or tool for cutting
shives, and especially I claim the spring action thereof, substantially as set forth.
In witness whereof, I, the said Edward John Heal, have hereunto set my
hand and seal, this Fifth day of April, in the year of our Lord One
thousand eight hundred and eighty two.