A PORTABLE APPARATUS TO FACILITATE THE CUTTING OF LOCK AND OTHER LIKE MORTICES IN DOORS OR PANELS
Year: 1876

page_text: PROVISIONAL SPECIFICATION left by Alfred Willmer Pocock at the Office of
the Commissioners of Patents on the 15th May 1876.
ALFRED WILLMER POCOCK, of Spencer Road, Wandsworth, in the County of
Surrey, Engineer. "A PORTABLE APPARATUS TO FACILITATE THE CUTTING OF LOCK
AND OTHER LIKE MORTICES IN DOORS OR PANELS."
This Invention relates to a portable apparatus to facilitate the cutting of lock
and other like mortices in doors or panels, and is composed of two clamps capable
of attaching the apparatus to a door. The clamps carry a sliding plate which has
an up-and-down or a to-and-fro motion imparted to it by an adjustable link, one
end of which is fixed to one of the clamps, and the other to a piu which can be slid
in a slot cut in a wheel, in order that the pin can be "sett" to determine the length
of the mortice or slot to be formed. This wheel has teeth on its edge geared into
by a pinion the axle of which derives its motion from a worm on a sleeve, through
which a sliding and a revolving shaft is free to travel endwise. This shaft carries the
cutters at one end by which the mortice has to be cut, and it partakes of its
rotatory motion from a whorl formed on part of the sleeve driven by a gut band
from a hand wheel also carried by one of the clamps or the frame to which the
clamps are fitted, the gut band being led over the whorl by pullies fitted for the
purpose. This motion might be given by a screw or cam, but would not then be
adjustable without the intervention of a lever.
The toothed wheel has a couple of cams on its inner surface, and these act upon
and press inwards a catch on a lever whose tail end is pressed upon in the reverse
direction by a pin encircled by a spring to keep the catch in contact with the wheel
in its rotation, the cams in their turn causing the lever to force down the pin
(which also acts as a spindle and carries a pinion) to keep a pinion out of gear with
the worm on the sleeve, this pinion being on the opposite side of the sliding
frame, whereby an alternate or intermittent end on travel of the cutter shaft takes
place.
The pin spindle carries a worm to gear into a pinion on a separate shaft, a
portion of which is threaded and carries a threaded sliding socket piece forked to
embrace the cutter shaft, to which it is held by a collar fixable by a screw pin at
any part of the shaft to suit the depth of the slot or mortice to be cut.
The cutter shaft is of triangular or other equivalent shape in cross section, and
carries near the inner or cutting end another cutter or set of cutters of larger
.

page_text: diameter for cutting the rebate in the edge of the door, the cutter or cutters
only coming into actual action while the mortice cutters are doing their last travel
up or down the slot or mortice.
The end on travel of the rebate cutter or cutters is determined by a plate or
strip of metal being borne against by the collar of the mortice shaft just before
it completes the morticing, the two cutters or sets of cutters then working at the
samo time.
The keyhole when of an elongated shape is cut by a supplementary cutter
working in a similar manner to the morticing cutter but at right angles to it, or
when of a circular shape by an ordinary or twist centre bit an adjustable gauge
being secured to the clamping frame to guide it square with the door or panel, a
similar gauge being also provided for cutting the spindle hole.
The end-on movement of the cutter may be continuous, or it may be produced
by the action of an alternate movement of a pawl acting on a long rack, and
the main wheel instead of being a spur wheel may be a ratchet wheel.