Improvements in Planing Machines.
Year: 1899

page_text: Date of Application, 21st June, 1899
Complete Specification Left, 21st Mar., 1900-Accepted, 21st Apr., 1900
I, FREDERICK WILLIAM TANNETT-WALKER, of Hunslet, Leeds, in the County
of York, Engineer, do hereby declare the nature of this invention to be as
follows:-
The difficulty in an ordinary planing machine is moving the great weight of
the table and the piece of machinery which is on it being planed. This trouble
is much accentuated on the return journey when the machine is not cutting and
therefore greater speed is desirable.
In order to overcome this difficulty I employ two hydraulic rams, one acting
on the table in each direction controlled by a 3-way valve, which valve is reversed
at the same time as the belt of the machine, so that practically the controlling
of the machine is done by the belt, all the strains being taken by the hydraulic
rams.
Dalth th low of Tu 1800
Improvements in Planing Machines.
I, FREDERICK WILLIAM TANNETT-WALKER, of Hunslet, Leeds, in the County
of York, Engineer, 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:-
The difficulty in an ordinary planing machine is moving the great weight of.
the table and the piece of machinery which is on it being planed. This trouble
is much accentuated on the return journey when the machine is not cutting and
therefore greater speed is desirable.
In order to overcome this difficulty I employ two hydraulic rams, one acting
on the table in each direction controlled by a 3-way valve, which valve is reversed
at the same time as the belt of the machine, so that practically the controlling
of the machine is done by the belt, all the strains being taken by the hydraulic
rams.
Figure 1 is a side elevation and Figure 2 a plan of a planing machine con-
structed according to this invention." In Figure 1 one of the standards is
omitted.
A is the stationary bed and B the reciprocating table. C is the main shaft
driving the shaft D by the belt E. F and F1 are bevel wheels fixed to sleeves
free to turn on the shaft D, but not moving longitudinally on it and G G¹ are
гр

page_text: hollow cones fixed to the sleeves. H is a sleeve turning with the shaft D but
free to move longitudinally on it. The sleeve H has fixed to it a pair of cones
engaging respectively with the cones G G¹. I is a rod passing along inside the
shaft D (which is hollow) and fixed to the sleeve H. This rod can be moved to
and fro by the rocking shaft J to which it is connected as shown in Figure 1.
The rocking shaft J is actuated by the longitudinal rod K. By shifting the
sleeve H by means of the rod K either the wheel For the wheel I can be driven.
The wheel F gives the return movement gearing with a wheel L' on the shaft L
which carries pulleys L2 on which are wound ropes M which pass round stationary
pulleys N and are fixed to the table B at M¹. The wheel gives the direct or
cutting movement gearing with a wheel O' fixed to the shaft O which carries a
pulley O2 on which is wound the rope P which passes round the pulley Q carried
by the table B and has its end fixed at P¹. These arrangements are ordinary
practice and do not form any part of the present invention.
a a and b b are four hydraulic cylinders fixed to the sides of the table B. Their
piston rods a¹ are hollow and have their ends fixed at a² 12. cand dare pipes
connected respectively to the hollow piston rods a¹¹. e is a three way valve
which simultaneously connects the pipe c to the supply and d to the discharge,
or c to the discharge and d to the supply. f is a rod connecting the lever of the
valve to an arm on the rocking shaft J. In this way the valve e is reversed
simultaneously with the reversal of the ordinary driving mechanism.
Figures 3 and 4 are similar views to Figures 1 and 2 showing another arrange-
ment.
In this case the shaft C drives the shaft D by two belts E E¹ the latter being
crossed. The belt pulleys are loose on the shaft D but either of them can be
connected to it by making one or other of the cones on the sleeve H engage with
the cone in the pulley. The sleeve H is connected to the rocking shaft J as
before. D is a pinion on the shaft D gearing with the wheel R¹ on the shaft R,
which has fixed to it a pinion R2 gearing with the wheels S which engage with the
rack B on the underside of the table B. In this case two hydraulic cylinders a b
only are employed. is a rope which has one end fixed to the cylinder a, and
passes around pulleys a² a on it and on its ram, around the stationary pulley h
and has its other end fixed at g' to the table B. j is a rope which has one end
fixed to the cylinder band passes around pulleys 62 63 on it and on its ram around
the stationary pulleys and has its other end fixed at ¹ to the table B. The
three way valve e is connected by the rod f to the rocking shaft J.
It will readily be understood that the hydraulic cylinders may be put in any
other convenient place for example they may be supported by the standards.
A single hydraulic cylinder acting only during the return stroke may also be
used but it is usually preferable to have one for each direction of movement.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. The combination with a planing machine of a hydraulic cylinder or cylinders
whose valve or valves is or are reversed at the same time as the belt or other
driving mechanism of the machine.
2. Planing machines substantially as described and illustrated in the drawings.
Dated this 90th day of March 1000
F. W. TANNETT-WALKER.