Improvements in and relating to Pneumatic Tools for Chipping and like Operations.
Year: 1899

page_text: Date of Application, 1st Nov., 1899
Complete Specification Left, 26th July, 1900-Accepted, 1st Sept., 1900
PROVISIONAL SPECIFICATION.
Improvements in and relating to Pneumatic Tools for Chipping and
like Operations.
I, ARTHUR TAYLOR, of Jute Street, in the City and County of Aberdeen,
Monumental Sculptor, do hereby declare the nature of my invention to be as
follows:
:-
This invention has reference to improvements in and relating to pneumatic
tools, or air hammers, and more particularly to the pistons of the chisels used in
cutting granite and the like.
According to my improvements the piston is formed with an annular space
which comes opposite the inlet air port, and a series of passages lead from this
space to the lower end of cylinder for conveying the pressure air to actuate the
piston in its up-stroke.
A series of radial ports and central longitudinal passage are also formed in
piston for conveying the pressure air to the top of cylinder to actuate the piston
in its down stroke; and outlet ports are provided in cylinder for the exhaust to
take place from opposite ends of piston.
A screwed on cap is fitted at the top end of cylinder and the chisel or tool is
attached to a narrowed part of piston at lower end of cylinder.
The tool is so constructed externally that it can be held like an ordinary
hammer by screwing a handle into the inlet port.
Datal 2011.
1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
Improvements in and relating to Pneumatic Tools for Chipping and
like Operations.
I, ARTHUR TAYLOR, of Jute Street, in the City and County of Aberdeen,
Monumental Sculptor, do hereby declare the nature of my invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement in writing:-
This invention has reference to improvements in and relating to pneumatic
tools, or air hammers and more particularly in the simplicity of the cylinder
and the way it can be held in cutting granite and the like.
And in order that my said invention and the manner of carrying same into
practice may be properly understood I have hereunto appended an explanatory
n
077

page_text: drawing in which Figure 1 represents a sectional elevation of my improved
pneumatic tool apparatus and Figures and 3 represent sectional plan views as
taken on the lines 2-2 and 3-3 respectively of Figure 1.
Referring to these drawings:-
--
According to my improvements the piston A is formed with an annular space a
which comes opposite the inlet air port B and a series of passages preferably
two lead from this space a to the lower end of cylinder B for conveying the
pressure air to actuate the piston A in its up-stroke.
A series of radial ports c and central longitudinal passage c¹ are also formed in
piston A for conveying the pressure air from the annular space to the top of
cylinder B to actuate the piston in its down stroke; and outlet ports are
provided in cylinder B for the exhaust to take place from opposite ends of
piston A.
A screwed on cap e is fitted at the top of cylinder B, and the chisel or tool is
struck by the narrowed part A' of piston A at lower end of cylinder B. Grooves
are formed or cut at the joints e¹ on cover e and part B2 surrounding tool to hold
the rubber or other jointing packing.
The tool is so constructed externally that it can be held like an ordinary
hammer by screwing a handle into the inlet port B'.
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
.
First. A pneumatic tool for chipping and like operations having its parts
arranged and piston formed with annular space, passages and ports substantially
as herein described in reference to and shown in the accompanying drawings.
Second. In pneumatic tools for chipping and like operations, a piston having
an annular space, and passages and ports leading the pressure air to opposite ends
of cylinder, arranged in the manner herein described in reference to and shown in
the accompanying drawings.
Dated the 25th Jul 1900