Improvements in Mortising Machines.
Year: 1895

page_text: Date of Application, 21st Dec., 1895
Complete Specification Left, 10th Oct., 1896-Accepted, 14th Nov., 1896
PROVISIONAL SPECIFICATION.
Improvements in Mortising Machines.
We THOMAS LEES, RALPH LEES, and WILLIAM LEES Junior, all of Park
Foundry, Hollinwood, near Oldham, in the County of Lancaster, Engineers, do
hereby declare the nature of this invention to be as follows:-
Our said invention relates to improvements in a former invention for mortising
machines described in Patent Specification No. 4299 of A.D. 1890 and has for
its object a more convenient combination of mechanism which permits of more
effectually balancing the working parts and at the same time gives greater solidity
and certainty of operation.
According to our present invention the crank shaft is at right angles to the front
of the machine. The crank is connected by a jointed link to a main lever having
its fulcrum on struts hinged at their lower end. The end of the main lever beyond
the fulcrum engages directly with and operates the tool slide. The main lever is
so proportioned that its own gravity counter-balances the tool slide. A wrist plate
has hinged to it a link or radius rod connected at the other end to the jointed link
which connects the crank to the main lever so as to form a toggle therewith. The
position of the wrist plate thus determines the play of the jointed connecting link.
When the radius rod is at right angles to the latter the connecting link becomes
practically rigid and the full stroke of the crank is imparted to the main lever.
When the radius rod is parallel to the jointed connecting link the hinge pin simply
receives a pendulous motion about its point of connection with the main lever
when the crank revolves and thus no motion is imparted to the main lever. By
setting the wrist plate so as to cause the radius rod to assume any intermediate
angle to the jointed link the stroke may be varied at the will of the operator.
The wrist plate is connected to a treadle lever by a link at a point between its
fulcrum and the treadle. The weight of the treadle and the wrist plate is counter-
balanced by a weight attached to the wrist plate itself.
Dated this Twentieth day of December 1895.
E. T. WHITELOW, A.M. Inst. C.E.,
70 Deansgate, Manchester, Agent for the Applicants.
We THOMAS LEES, RALPH LEES, and WILLIAM LEES Junior, all of Park
Foundry, Hollinwood, near Oldham, in the County of Lancaster, Engineers, 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 said invention relates to improvements in a former invention for mortising
machines described in Patent Specification No. 4299 of A.D. 1890 and has for
its object a more convenient combination of mechanism which permits of more
effectually balancing the working parts and at the same time gives greater solidity
and certainty of operation.
In order to more clearly set forth our said invention we will describe the same

page_text: with reference to the accompanying drawings which¹are to be understood as forming
part of the present specification.
DESCRIPTION OF DRAWINGS.
Fig. 1 is a front elevation.
Fig. 2 is an end elevation.
Fig. 3 is a plan.
Figs. 4 and 5 are detached elevations representing the levers and the wrist plate
in other positions than those shown in Fig. 1.
In these drawings A is the reciprocating tool holder mounted on a slide A¹, 6 is
the crank or main driving shaft driven by belt pulleys 6¹ in the usual manner.
The tool slide A' is operated from the crank shaft 6 and the stroke of the
chisel is controlled by the intervening mechanism which forms the object of our
present invention.
The crank shaft bis at right angles to the front of the machine instead of
being parallel thereto as described in the Patent Specification No. 4299 of
A.D. 1890. A jointed link c c¹ connects the crank 62 to the main lever d which
has its fulcrum e¹ in a strut or struts e hinged at e to a bracket on the,bed plate
of the machine. The eud d' of the main lever engages directly with and operates
the tool slide A¹. The main lever d is so proportioned that its own gravity
counterbalances the tool slide. A wrist plate f having its fulcrum at f' is con-
nected by a link or radius rod f' to the jointed link c c¹ so as to form a toggle
therewith. The position of the wrist plate f thus determines the possible deflection
of the link ce from a straight line.
When the wrist plate is in the position shown in Fig. 4 with the radius rod f
approximately at right angles to the link c¹ the jointed link c c¹ becomes practically
rigid and the full stroke of the crank is imparted to the main lever d. When
the wrist plate is in the position shown in Fig. 1 the radius rod f is parallel to
the link and the hinge pin then simply swings about its point of connection c
on the main lever d when the crank revolves and thus no motion is imparted to the
main lever. If the wrist plate is set at any intermediate position such for
instance as shown in Fig. 5 the revolution of the crank 62 will cause the main
lever d to oscillate to an extent depending on the particular angle the wrist plate
assumes as compared with its extreme position. Thus by varying the angle of
the wrist plate any desired stroke may be given to the chisel. To enable the
angle of the wrist plate to be varied at will while the machine is being driven a
treadle lever 9 having its fulcrum at g' is connected by a link g (between the
fulcrum g¹ and the treadle g³) to the wrist plate. By depressing the treadle g³ the
wrist plate may be turned through any desired angle. The weight of the treadle
lever and the wrist plate is counterbalanced by a weight h attached to the wrist
plate itself.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is.―
1. In a mortising machine the hereinbefore described means for actuating and
controlling the stroke of the tool substantially as set forth and shown.
2. In a mortising machine the combination of a reciprocating tool slide A' a
lever d engaging directly therewith and mounted in a hinged strut or struts e a
wrist plate fa radius rod f³ a jointed connecting link cc' a crank shaft b at right
angles to the front of the machine and a treadle lever g substantially as and for
the purpose set forth and shown.
Dated this 9th day of October 1896.
E. T. WHITELOW, A.M. Inst. C.E.,
70 Deansgate, Manchester, Agent for the Applicants.