An Improved Safety Grinding Rest.
Year: 1897

page_text: An Improved Safety Grinding Rest.
JOSEPH BRADBURY of the Brook Ironworks Charles St. Oxford St. Manchester
in the County of Lancaster Engineer, do hereby declare the nature of this inven-
tion to be as follows:
:-
My said invention relates to the rests which are usually fixed in front of grind-
ing stones to support the tools or other object to be ground.
The ordinary rest consists usually of a fixed bar or bracket extending accross the
front of the stone & bolted to the top of the trough. This is set up within a short
distance from the stone & is immovable when in use. In grinding an object it
frequently happens that accidents take place and the fingures of the workman are
drawn between the grindstone & the rest the result being usually severe injury to
the hand.
My object is to prevent such accidents & to effect this I mount a rest in such a
manner that while it remains as useful as before for general grinding purposes it
will nevertheless move away from the stone if anything should get between the
stone & the rest so that jambing & consequent accident is scarcely possible. In
carrying my invention into effect I provide two standards or brackets which are
bolted to the top of the trough each side of & in front of the stone. In each of the
said brackets a foot or pedestal is prepared with seatings of such a shape & angle
so as to receive the lower ends of the rest proper which consists of a plate having
a straight top edge. The upper end of the said rest is supported by a arm sprung
from the above mentioned bracket & of such a shape that it will act as a fulcrum
in throwing the rest away from the stone when so required. The rest is thus free
to drop away from the stone to a required limit & thus prevent jambing & accidents
to the workman.
The rest is set at such an angle relatively to the circumference of the stone that
even if a wedged shape object should be dropped between the revolving stone &
the rest the tendency will not be to jamb but to push the rest outwards & make it
fall over so as to lie away from the stone. The result of my improved arrangement
of rest is if by any possibility the workmans fingers should slip between the rest
& the stone the motion of the stone would instantaneously throw the rest over
entirely away from the stone & thus leaving the fingers or hands free; making
accidents above referred to almost an impossibility.
Dated thin 10th day of 3. 1907

page_text: in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:
The object of this invention is the construction of a rest for the article being
ground on a stone or wheel which shall make it almost impossible for the work-
man to be injured by such stone or wheel through the catching of the work or of
any portion of the person of the workman between the rest and the stone or wheel.
In carrying out my invention I mount upon the trough of the grind stone or
wheel two standards or brackets one at either side and just in front of the stone or
wheel these standards or brackets being provided with a recess of suitable shape
and angle to receive foot pieces which I depend from the rest for the purpose the
rest itself being formed of a plate having a straight top edge to allow of the article
being ground being freely moved to and fro.
The rest by its foot pieces is allowed to remain in front of the stone or wheel at
the correct angle for grinding but upon any obstruction however slight coming
between the rest and the stone or wheel the rest immediately falls away from the
stone or wheel at such an angle as to leave a good space between the rest and the
stone or wheel and in this way it is almost an impossibility for the workman to be
injured.
And in order that my invention may be more readily understood and carried
into effect I have hereunto annexed a sheet of drawings illustrative of the same
which I will now proceed to describe with the assistance of the various Figs and
letters of reference marked thereon, like letters being used in all views to denote
like parts.
Although I shall only describe my invention as applied to a grind stone it will
be apparent that it is equally applicable to all grinding or polishing stones or
wheels.
Fig 1 is a front view of a grind stone with my improved rest attached and Fig 2.
is an elevation of so much of a grind stone as is necessary to illustrate my
improved rest in position ready for work and Fig 3 is an elevation of so much of
a grind stone as is necessary to illustrate my improved rest when thrown from the
face of such stone by an obstruction.
A is a grind stone and B is the trough upon which are mounted the standards
or brackets C in which are formed the recesses D) and resting places to support
the foot pieces F of the rest G which rest G is formed of a plate having a straight
top edge H to allow of the article being ground being freely moved thereon. It
will now be seen that upon any article being held in front of the stone for the pur-
pose of being ground the rest G will remain in the position illustrated in Fig 2.
but upon the slightest obstruction getting between the stone A and the rest & such
rest G will be instantly thrown from the face of the stone A into the position illus-
trated in Fig 3. and so it will be seen that it is practically impossible for the work-
man to be injured.
Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed I declare that what I
claim is.
Firstly. The use and application of apparatus constituting a sefety rest for
grind stones and wheels substantially as hereinbefore described and illustrated on
the accompanying drawing.
Secondly. The combination of standards or brackets C rest G with foot pieces F
mounted and operating substantially as and for the purposes herein before described
and illustrated on the accompanying drawing.