Improvements in Motive Power Mortising Machines.
Year: 1889

page_text: Date of Application, 23rd Jn., 1889
Complete Specification Left, 11th Oct., 1889-Accepted, 16th Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Motive Power Mortising Machines.
We EDWARD (ORY, FREDERICK WILLIAM REYNOLDS and GEORGE WADSWORTH
URAGO CATFORD all of Acorn Works Edward Street, Blackfriars Road, London,
Engineers, do hereby declare the nature of this invention to be as follows:-
:-
The object of this invention is to improve the appliances in a Mortising Machine
whereby the mortice chisel is actuated.
The fiunber to be mortised is held in a bed or holder of the ordinary type, having
longitudinal, transverse and elevating motions.
We construct our appliances for working the chisel in the following manner.
The driving shaft has a crank at one end, on the crank pin of which is a pulley free
to revolve. At a certain distance away from the crank is a second similar pulley
carrie in a spring bearing, in such a manner that it can approach nearer to or further
from the crank.
The two pulleys are connected by an endless belt. The belt on one side is attached
to the holder, carrying the chisel, which works in guides, and on the other side to a
counterbalance weight, also working in guides, which is somewhat heavier than the
chisel holder. The counterbalance weight is attached to and worked from a foot or
hand lever or in any other convenient manner.
In so
When the machine is driven by motive power the crankshaft revolves, making the
centre of the belt pulley, which is attached to same, describe circle.
doing it pulls the belt down and with it the spring pulley, which are again brought
back by the spring, thus giving a reciprocating motion to the belt. Now, if
one si le of the belt he held still by the counterbalance and lever, the other side of the
belt, to which the chisel holder is attached, will reciprocate this holder with a stroke
equal to twice the throw of the crank pin. If therefore the fixed counterbalance be
at its lowest point, the holder will be reciprocating at its highest point, and if the
counterbalance weight be raised, the holder, and with it the chisel, will be lowered
or brought down into the work, having all the while the reciprocating motion. The
object of giving a reciprocating motion to the chisel whilst at the same time it can
be brought down into the work or retired th refrom, is thus easily effected.
a
To avoid stopping the machine whilst fixing the work in position, and as
protection from the chisel, we fix a guard to the machine in such a way that the
chisel can reciprocate within it when it is raised up out of the work.
Dated this 23rd day of January 1889
EDWARD CORY.
FREDK. W. REYNOLDS.
GEO. W. C. CATFORD.
COMPLETE SPECIFICATION.
Improvements in Motive Power Mortising Machines.
We EDWARD CORY. FREDERICK WILLIAM REYNOLDS and GEORGE WADSWORTH
CRAGG CATFORD, Engineers, of Acorn Works, Edward Street, Blackfriars Road,
London 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 :-
We construct the appliances for working the chisel in Power Mortising Machines
in the following manner. The power is communicated by a shaft driven in the
ordinary way by fast & loose pulleys and carrying a crank, on the crank pin of
which is a pulley free to revolve on same, at a certain distance from this pulley is

page_text: a second pulley carried in bearings and caused to approach and recede as the crank
pin turns, by means of a belt connecting the two pulleys together. This second pulley
will be drawn by the belt and made to recede by springs, levers, or a connecting rod
between the two pulleys.
To one side of this belt is fixed the chisel head, and to the other side of the belt a
counterbalance or weight.
The action of this arrangement is as follows-When the weight is kept still and the
crankshaft put in motion, the chisel head reciprocates with a stroke double the length
of the throw of the crank.
When the weight is moved, the chisel head is caused to move in an opposite
direction, and thus, though reciprocating all the time, it can be drawn into the work
to cut the mortice.
For working the counterbalance weight we also construct a compound lever, which
has two points in its stroke where the strain of the movement of the machine is thrown
upon the machine itself instead of on the workman's foot.
A guard is attached to the machine in which the chisel can reciprocate when drawn
out of the work.
The annexed drawing shows a means we adopt for carrying out this invention,
but we do not bind ourselves to the particular form of appliances there shown.
Fig. 1. Sheet 1. is a section of a mortising machine in which A is the crank,
which is driven by power. B is a pulley, carried on the crank pin on which it
rovolves, whilst at the same time it revolves with the crank. C is another pulley
working in the guide D and made to follow the reciprocating motion of the pulley B
by means of the connecting rod E. F. is the belt, attached to the counter-
balance weight G, which is then led round the pulley B, attached to the chisel
holder H, and from thence round the pulley and back again to the weight G.
The weight G is actuated by the bent foot lever I. I. moving on the pin J.
Connection to the weight is made by three links K. L and M. The three links
are jointed together at N. and the link L works on a fixed pin O.
The action of the apparatus is as follows. The crank A being driven, the
pulleys & B move up and down, but when the belt is held by the weight G,
the chisel head H reciprocates-If now it be required to bring the moving chisel
down into the work, on raising the weight G the chisel head I will descend.
The weight G is held firmly in the position shown in the drawing, when the
short end of the foot lever I and the link K are in a straight line-When
however the foot lever is pressed down, to bring the chisel into the work, the
weight G is raised, and the links Land M are brought into a straight line, sup-
porting and steadying the weight. P is a guard in which the chisel works when not
in use.
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
1st. The combination of a belt working over reciprocating pulleys, and carrying
the chisel head of a mortising machine and a counterbalance weight, for the purpose
of giving a reciprocating motion to the chisel head whilst at the same time the
head can be brought down towards & retired from the work, substantially as
described.
2nd. The compound lever for actuating and steadying the chisel of a mortising
machine substantially as described.
3rd. The guard, in combination with a mortising machine, for protecting the chise!
working within it when the latter is thrown up out of the work.
EDWD. CORY.
FREDK. W. REYNOLDS.
GEO. W. C. CATFORD.