An Improved Power Morticing Machine.
Year: 1898

page_text: Date of Application, 1st Feb., 1898
Complete Specification Left, 31st Oct., 1898-Accepted, 28th Jan., 1899
I, WILLIAM COLLINS PIPER, of 117, Palmerston Road, Boscombe, Bournemouth,
Machinist, do hereby declare the nature of this invention to be as follows:-
The invention consist of an oscillating frame, to obtain the graduated stroke,
so necessary in power morticing machines. The frame is placed on top of machine,
and is worked by hand screw in front, or foot lever at back of machine.
It gives a direct action from crank to chisel, which is driven by chain wheel from
central shaft.
An Improved Power Morticing Machine.
I, WILLIAM COLLINS PIPER, of 117, Palmerston Road, Boscombe, Bournemouth,
Machinist, 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 :-
This invention relates to power mortising machines, and consists in the employ-
ment, as hereinafter described of an oscillating or vibrating frame, or lever to
obtain the graduated stroke so necessary in power mortising machines.
In carrying out the invention the frame or lever is mounted on a shaft carried in
bearings placed on the top of the frame of the machine, the frame or lever being
free to oscillate or rock, and such oscillating vibrating, or rocking movement is
utilized to give a self-acting downward graduated feed to the cutting tool or
chisel.
The stroke or vibration of the frame or lever is controlled by a hand screw, lever,
or other friction device. The rocking frame or lever carries a crank, by and from
which a direct reciprocating action given to the slide, and cutting tool or chisel,
the crank being driven by chain wheel or other gear from a driving shaft.
Having thus generally described the object, nature, and effects of my invention,
I will now proceed to describe it with reference to the sheet of accompanying
drawings, in which I have illustrated by diagram the action of the rocking lever
to give a self-acting downward graduated feed to the cutting tool or chisel, and
shown the application of the invention to a power mortising machine. In the
various figures the same parts are designated by the same letters, and figures,
and they correspond with those used in the following explanation :-
Figure 1 shows the motion for mortising machines according to my invention, by

page_text: .
Figure 2 is a side elevation of a power mortising machine with my invention
applied thereto.
Figure 3 is a plan showing one form of the oscillating frame or lever.
Figure 4 is a plan of a friction device for retaining or imprisoning the
downward vibrations of the frame to obtain the graduated movement of the cutting
tool.
With reference to Figure 1, a designates an oscillating or rocking frame, or lever,
and b the bearing on which the lever a rocks. c is a crank carried, by and rotating
on the lever a, & designates the tool holder slide of a mortising machine, and e a
connecting rod from the crank a to the tool holder slide d, f is the driving belt and
pulley, and g is the belt gear which drives the crank c, w is a balance weight by
which the lever a is kept in its normal or upward position, and p is a foot-lever for
setting the tool or chisel, h is a bar, and h¹ a friction device by which the
downward vibrations of the lever a caused by the rotation or centrifugal throw of
the crank c are caught and held thus giving a graduated downward movement to
the end a¹ of the lever a and thereby to the connecting rod e, and the slide d.
The novel feature of my invention consists in utilizing the successive vibrations
of the rocking lever a caused by the rotation of the crank c against the balance
weight w, and imprisoned by the friction device, to give the graduated downward
movement to the tool holder slide d which is at the same time having reciprocating
movement imparted to it by the crank c.
Referring to Figures 2, 3 & 4 which show a power mortising machine with my
invention as above described applied thereto, i is the frame of the machine, & is the
table which may be fitted with the usual lateral, and transverse slide movements, and
may rise and fall to suit pieces of timber of different thickness, d is the slide
which carries the adjustable cutting tool holder m, and f is the driving belt and
pulley. All these parts substantially are found in the usual forms of vertical power
mortising machines together with other parts such as a boring spindle and gear,
and a full description of them here is deemed unnecessary.
Referring to Figure 2 it will be seen that the lever is mounted on a shaft b¹
running in bearings b bolted to and supported by the frame i. Carried by and
running in bearings c¹ is a shaft c² on which is a crank c. The crank shaft c² and
thereby the crank c are driven by the pulleys, and belt g, one of the pulleys being
on the crank shaft c², and the other on the shaft b' which is operated by the fast and
loose pulleys and driving belt f.
At the end a² of the lever a there is connected a rod w¹ which extends down to
the bottom of the frame i, and is provided with a balance weight w, and connected
to a foot-lever p which is fulcrumed at p. At the end a¹ of the lever a there is
connected a pendant bar h which slides in a friction brake h¹ under control of a
hand-lever provided with springs h³ by which pressure is placed on the lever h
and through the friction brake or dog h¹ on the bar h. The connecting rod e is of
the usual form and connects the slide d and crank c direct, and as the crank c rotates
a direct reciprocating movement is given-to the slide d and thereby to the cutting
tool holder m. A balance wheel c³ may be provided on the crank shaft c².
In operation by depressing the foot-lever p when the machine is at still, or at
rest, it raises the end a² and depresses the end a¹ of the lever a and brings the
slide d to its full depth, and the chisel m¹ can be set as required for the work.
When the machine is started, the rotation of the crank c causes the lever a to rock
or vibrate, and each downward vibration of the end a¹ of the lever a is held or
imprisoned by the friction device h¹ holding the slide bar h thus lowering the centre
of the crank at each vibration of the lever a, and causing a self-acting graduated
downward stroke to be given to the tool holder, and cutting tool, or chisel, the
lever a finally resting on the bracket as shown in dotted lines. After cutting
through the timber the friction device h¹ is released by means of the hand-lever h²,
the weight w then brings the lever a back to its normal position.
I would have it understood, any suitable form of rocking frame or lever may be
used, and that instead of the crank c a disc crank may be used to work the

page_text: reciprocating motion, and the length of its stroke can be controlled by moving the
crank pin nearer to, or further from the centre of the disc, in this case a form of
rocking frame or lever adapted to carry a disc crank must be used instead of the
form shown. I would also have it understood that any suitable form of friction device
to hold the rocking lever may be used, and that my invention is not confined to any
of the forms or parts shown in the drawings, as I have not endeavoured to specify
the modifications which may be employed, the object of this specification being to
enable persons skilled in the art to practise the novel feature of my invention in a
form at present in practise by me.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a power mortising machine the combination of an oscillating or rocking
frame or lever, or rotating crank by which the frame or lever is vibrated from its
normal position, and a device whereby the downward vibrations of the frame or
lever are successively held, and give a graduated downward feed movement to the
cutting tool or chisel substantially as described.
2. In a power mortising machine an oscillating or rocking frame or lever
having mounted thereon a rotating crank which actuates the cutting tool or chisel,
and vibrates such frame or lever, and a device which imprisons the downward
vibrations of the lever and thereby imparts a graduated downward feed motion to
the cutting tool or chisel substantially as described.
3. In a power mortising machine the combination of parts substantially as
set forth with reference to Figures 2, 3 & 4 of the drawings consisting of an
oscillating or rocking frame or lever a, crank c, friction device h, h¹, h², weight w,
foot-lever : operating as described.
ed this 25th day or October 1898.
FREDERICK J. CHEESBROUGH, Fel. Chart. Inst. P.A.,
Grant & Maddison's Bank Buildings, Canute Road, Southampton,
Applicant's Agent.