Revolving Stones, Emery Wheels, and the like.
Year: 1888

page_text: Revolving Stones, Emery Wheels, and the like.
We, JOHN SIDNEY CROWLEY of Corporation Street Manchester in the County of
Lancaster Engineer and ROBERT TAYLOR, Junior, of 19 Hill Street, Oldham in the
said County 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:—
Our invention consists in the construction arrangement and application of a new or
improved safety rest for tools or articles being ground by revolving stones emery
wheels and the like and the object of our Invention is to prevent any possibility of
the fingers or hands of the operator getting trapped between the tool rest and the
revolving grindstone which is an accident of frequent occurrence when ordinary tool
rests are employed.
1
The essential feature of the Invention then consists in so pivoting or otherwise
mounting the rest that if the tool or other article catches against the grindstone the
alteration in the direction of the pressure will instantly force back the rest and so
release the tool or article before it can be trapped or dragged down between the grind-
stone and the rest and before any serious injury can occur.
And in order that our Invention may be fully understood and readily carried into
effect we will describe the accompanying two sheets of Drawings reference being had
to the figures and letters marked thereon.
Figures 1 and 2 are elevations and Fig. 3 a plan of one of the brackets upon
which the safety tool rest is mounted according to our Invention. Fig. 4 is a front
elevation and Fig. 5 a side elevation showing the safety tool rest mounted on a pair
of the said brackets and applied to a grindstone or emery wheel.
In these views. a designates the grindstone emery wheel or other like article and
b the frame of the same; c c are a pair of adjustable brackets which are bolted or other-
wise adjustably secured to the frame bone on either side of the front of the grindstone a.
On each bracket c is pivoted a slotted arm d to which is bolted adjustably a bar e
which forms the rest for the tool or other article to be ground.

page_text: While the tool or other article is being ground properly the arms d and rest e
occupy the positions indicated by full lines in Fig. 5 ie. with the arms d resting
against the ledges or projections on the upright portions of the bracket c but imme-
diately the tool catches against the grindstone the rest e is by the change in the angle
of pressure forced away from the grindstone and with the arms d falls back into the
position indicated by dotted lines in the same Figure and so prevents any serious
accident. It is evident that the arms & might bear against screws or other adjustable
stop pieces so that their angle or position and that of the rest e may be varied inde-
pendently of the brackets c.
We would have it clearly understood that we do not wish to limit ourselves to the
exact details herein shown and described as the same may be varied or modified without
departing from the nature of our Invention which as previously stated consists essen-
tially in so mounting the tool rest that the same is caused to move away from the
revolving grindstone or equivalent immediately the tool or other article which the
rest is supporting begins to catch against the grindstone.
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. A safety rest for articles being ground by a revolving stone or equivalent said
rest being so mounted and arranged that it will be forced away from the grindstone
or equivalent immediately the tool or other article supported thereon catches against
said grindstone or equivalent for the purpose specified.
2. The construction combination and arrangement of parts constituting a safety
rest for tools and other articles being ground upon a revolving stone emery wheel
or the like substantially as and for the purposes herein described and as illustrated by
the Drawings annexed.
H. B. BARLOW,
17, St. Ann's Square, Manchester,
Agent for Applicants.