Improvements in or relating to Tool Grinding Machines.
Year: 1897

page_text: Date of Application, 2nd June, 1897
Complete Specification Left, 2nd Mar., 1898-Accepted, 23rd Apr., 1898
PROVISIONAL SPECIFICATION.
Improvements in or relating to Tool Grinding Machines.
We, WILLIAM KIRKLAND, 18, Clyde Street, Leicester, and ROBERT WRIGHT
MATHERS, of Oakleigh, Clarendon Park Road, Leicester, both Boot and Shoe Manu-
facturer's Foremen, do hereby declare the nature of this invention to be as follows: —
This invention has special reference to the tool or cutter grinding apparatus used
in connection with boot heel trimming machines and has for its object to improve
the construction thereof by the provision of a spark-guard or arrester and a cutter
shaft protector, as hereinafter referred to..
The invention is designed to insure protection to the eyes of the operator during
the grinding operation when sparking frequently occurs and also to prevent the
particles removed from the grindstone by the application thereto of the rotary
cutter, getting into the bearings of the cutter shaft.
The device constituting the present invention may consist of a curved plate
adapted to partly surround the grindstone or disc and intercept or arrest the sparks
as they fly off.
'
This curved plate may be connected to or integrally formed with a tube or tubular
sleeve to encircle the cutter shaft and the end of the said sleeve adjacent to the.
grinding stone disc may be partly filled in or the opening reduced in diameter and
provided with a leather, asbestos, rubber or other suitable washer fitting snugly to
the shaft to prevent any grit or particles off the grindstone getting into the bearings.
Connected to the said sleeve may also be an extension for either the lubricator
or to fix the device in proper position on the machine.
Dated this 1st day of June 1897.
BOULT & WADE,.
Agents for the Applicants.
Improvements in or relating to Tool Grinding Machines.
We WILLIAM KIRKLAND, 18, Clyde Street, Leicester, and ROBERT WRIGHT:
MATHERS, of Oakleigh, Clarendon Park Road, Leicester, both Boot and Shoe Manu-
facturer's Foremen, 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 has special reference to the tool or cutter grinding apparatus used
11 connection with boot heel trimming machines and has for its object to improve.

page_text: the construction thereof by the provision of a spark guard or arrester and a cutter
shaft protector, as hereinafter referred to.
!
The invention is designed to insure protection to the eyes of the operator during
the grinding operation when sparking frequently occurs and also to prevent the
particles removed from the grindstone by the application thereto of the rotary cutter,
getting into the bearings of the cutter shaft.
The device constituting the present invention may consist of a curved plate
adapted to partly surround the grindstone or disc and intercept or arrest the sparks
as they fly off.
This curved plate may be connected to or integrally formed with a tube or tubular
sleeve to encircle the cutter shaft and the end of the said sleeve adjacent to the
grinding stone or disc may be partly filled in or the opening reduced in diameter
and provided with a leather, asbestos, rubber or other suitable washer, fitting snugly
to the shaft to prevent any grit or particles off the grindstone getting, into the
bearings.
Connected to the said sleeve may also be an extension for either the lubricator
to fix the device in proper position on the machine.
or
The invention will be fully understood from the following further description
having reference to the accompanying drawing in which, Figure 1 is a perspective
view of the device constructed in accordance with this invention and,
Figure 2 is a section across the sleeve, and immediately in front of the curved
guard.
We will describe our improved spark guard or arrester and shaft protector in
connection with the machine well known in the trade as the "Smith Union Heel
Trimmer" for paring the heels of boots and shoes.
In this machine the rotary cutter is carried upon one end of a shaft the opposite
end of the latter being extended for several inches beyond its bearings and carries
thereon an emery wheel, upon which the cutters are ground.
The device consists of a guard or curved plate A as shown, one side A³ of which
has a central opening A² around which is soldered a tubular sleeve B on the upper
surface of which is fixed by rivets C a plate or extension C in the enlarged end C³
of which is a hole C³.
Within the sleeve B and close up against the opening A2 in the side of the curved
plate A is a leather or other flexible washer D the bore or passage in which is the
same as that of the cutter shaft so that it fits snugly thereon and will not permit
the passage of any grit or particles off the emery disc to get between and find their
way to the shaft bearing.
When applied to the machine hereinbefore referred to the curved plate A of the
device partly surrounds the emery or grinding disc and the tubular sleeve is passed
over the shaft around which the flexible washer D snugly fits. Through the
opening C³ in the extension C the end of a lubricator passes into the boss or bearing
of the said shaft and when the lubricator is screwed tightly down in position it grips
or tightens the extension against the bearing of the shaft and thus fixes it in
position.
"
In lieu of the lubricator, a screw might pass through the opening C³ to fix the
extension to the shaft bearing.
Although in order to enable the invention to be more readily understood it has
been described in reference to the heel trimming machine of the type heréinbefore
mentioned it should be understood that it is not confined in its use to such machine
but can be applied to other forms of tool grinding; machines..
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what we
claim is:-
1. The use, in a tool grinding machine. of. a combined guard and spark arrester
for the grinding disc and a tubular shaft bearing protector substantially as described
and with reference to the accompanying drawing.

page_text: 2. The complete device constructed and arranged substantially in the manner and
for the purpose described and illustrated in the accompanying drawing.
Dated this 1st day of March 1898.
WILLIAM KIRKLAND.
ROBERT WRIGHT MATHERS.
Witness:
E N. LEWIS,
Berridge Street Chambers,
Leicester.
WILLIAM KIRKLAND.
ROBERT WRIGHT MATHERS.
Boult & Wade,
Agents for the Applicants.