IMPROVEMENTS IN MORTISING MACHINES TO BE WORKED BY STEAM POWER
Year: 1877

page_text: LETTERS PATENT to William Blackett Haigh, of Oldham, in the County of
Lancaster, Machinist, for the Invention of "IMPROVEMENTS IN MORTISING
MACHINES TO BE WORKED BY STEAM POWER."
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PROVISIONAL SPECIFICATION left by the said William Blackett Haigh at
the Office of the Commissioners of Patents on the 5th December 1877.
WILLIAM BLACKETT HAIGH, of Oldham, in the County of Lancaster, Machinist.
“IMPROVEMENTS IN MORTISING MACHINES TO BE WORKED BY STEAM POWER."
This Invention relates to an improved mortising machine to be worked or driven
by steam power, and consists of an upright hollow frame of cast iron, from the base
of which, on its back side, project upwards pedestals or plummer blocks, carrying in
suitable bearings formed thereon a crank shaft. The crank of this shaft gives
motion by means of a connecting rod to one end of an overhead link or lever, which
extends in an inclined direction upwards towards the front of the machine, and is
embraced by a fulcrum piece or bracket, which slides over it, and is pivoted to a
carriage piece or block, which is moved in guides along the inclined top edge of the
frame to or from the said end of the lever by a screw working through it, and
operated by bevil wheels, which are mounted at the top part of the frame, and
driven by pulleys and belts from the crank shaft. The other or front end of the
link or lever is connected with the upper end of a bracket sliding vertically in guides
on the front side of the machine, and carrying the mortising tool, immediately below
which is placed the wood or other material to be cut; a radius rod or bar is con-
nected at one end with the upper end of the tool bracket, and at its other end with
a bracket projecting upwards from the lowest or back end of the inclined top edge
of the frame for the purpose of retaining the tool bracket in its proper position.
On a shaft conveniently arranged below the said parts is fixed a lover which is
operated by hand, and by means of stops suitably arranged, is caused to come

page_text: in contact with the carriage piece or block so as to regulate the depth of cut by the
tool as desired.
On turning the screw so as to move the carriage piece or block to or from the
back end of the link or lever, the fulcrum of the latter is virtually shifted, thereby
lengthening or shortening the stroke of its front end, which is connected with the
tool bracket, and so varying the cuts from nothing to the greatest depth required.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Blackett Haigh in the Great Seal Patent Office on the 5th
June 1878.
WILLIAM BLACKETT HAIGH, of Oldham, in the County of Lancaster, Machinist.
"IMPROVEMENTS IN MORTISING MACHINES TO BE WORKED BY STEAM POWER."
My Invention relates to an improved mortising machine to be worked or driven
by steam power, and is illustrated on the accompanying Sheet of Drawings, where
Fig 1 is a side elevation, and Fig. 2 a front elevation thereof, like letters of reference
indicating corresponding parts in both Figures.
My Invention consists in an upright hollow frame A, of cast iron or other
material, on the base of which, at its back side are cast, bolted, or otherwise fixed,
pedestals or plummer blocks B, carrying in their bearings the crank shaft C, which
extends across the machine, its crank giving motion by means of the connecting rod
D to one end of an overhead rocking beam or lever E, which extends in an upwardly
inclined direction towards the front of the machine, and slides through an embracing
fulcrum block or bracket F, pivoted to a carriage piece or chair G, sliding on guides
along the inclined top end of the frame A to or from the said lower end of the
rocking beam or lever E; this sliding movement is imparted to the carriage piece or
chair & by a screw H working through it, and caused to revolve by the bevil wheel
I, geared into by the bevil wheel I', which is mounted in suitable bearings J, at the
top part of the frame A, and driven by pulleys with open and cross belting from
two friction pullies K, K¹, fixed on the crank shaft C, and geared into alternately
as required by the friction cones L, L', which are operated by the levers M, N, as
hereafter described. The other or front end of the rocking beam or lover E is con-
nected by a link O with the upper part of the tool slide P, which slides vertically
in guides on the front side of the frame A, and carries the mortising tool and box
QQ, immediately below which is placed the wood or other material to be cut. A
radius rod or bar R is connected at one end with the upper end of the connecting
link O, and at its other end with a bracket R¹ projecting upwards from the lowest
or back end of the inclined top of the frame A, for the purpose of retaining the
rocking beam or lever E, and connecting link O, in their proper normal positions.
The hand lever M and clutch levers N are fixed to an upright shaft S, which is
provided at its upper end with a lever N¹, for coming in contact with the stops T,
adjustable on the rod U, which is attached to the carriage piece or chair G.

page_text: Motion being given to the machine, and the lever M moved by hand so as to
throw either of the friction cones L, L³, into gear with either of the friction pullies
K, or K¹, the screw is turned in either direction, and moves the carriage piece or
chair G to or from the back end of the rocking beam or lever E, thereby virtually
shifting the fulcrum of the latter, which causes the stroke of its front end with the
tool bracket P to be lengthened or shortened, and so varying the cuts of the
mortising tool from nothing to the greatest depth required.
As soon as the carriage piece or chair G has arrived in either direction at the
correct position along the top of the frame A, corresponding to the required depth
of cut to be given to the mortising tool Q, one of the stops T striking against the
lever N1 throws the friction cone L (or L as the case may be) out of gear with the
friction pulley K. (or K'), and the screw H thereby ceasing to revolve, the required
cut is maintained until an alteration is necessary therein, when the hand lever M
is moved again as before described.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider novel and original, and
therefore claim as the Invention secured to me by the herein-before in part recited
Letters Patent is,―
1. In mortising machines worked by steam power, the construction and use of an
inclined plane in combination with a sliding carriage or chair actuated by a screw,
and to which is pivoted a fulcrum block or bracket in combination with a rocking
beam or lever, and with a connecting link substantially as and for the purpose
herein-before described and illustrated by the accompanying Drawing.
2. The combination of a radius rod or bar with the connecting link, and with a
fixed bracket, substantially as and for the purpose herein-before described and
illustrated by the accompanying Drawing.
3. The application and use of stops adjustable on a rod attached to the carriage
piece or chair in combination with levers fixed on an upright shaft, and with
friction cones and pullies, substantially as and for the purpose herein-before described
and illustrated by the accompanying Drawing.
In witness whereof, I, the said William Blackett Haigh, have hereunto set
my hand and seal, this Thirty-first day of May, in the year of our Lord
1878
W. B. HAIGH. (L.S.)