Improvements in Cams for Quartz Crushing Machines and the like.
Year: 1895

page_text: Date of Application, 19th Nov., 1895
'omplete Specification Left, 19th Aug., 1896-Accepted, 19.h Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Cams for Quartz Crushing Machines and the like.
I, Joseph Trippett, of the Standard Steel Casting Works, Coleridge Road,
Attercliffe, Sheffield, in the County of York, Steel Founder, do hereby declare the
nature of my said invention to be. as follows:-
The cams of quartz crushing machines and the like machines for. crushing and
pulverising ores, minerals, and the like substances are subjected to considerable wear
and tear on the surfaces which are brought into contact with the tappets and the
object of my invention is to secure greater durability in such cams by constructing
them so that their wearing surfaces may be removable and interchangeable.
I effect this object in the following manner and although my invention is applicable
to such cams whether they are forged, stamped or cast, it is more particularly
applicable to cams which are cast in metal, as for example in malleable iron, cast iron
or cast steel; and as they are more commonly made in cast steel, a description of
my invention as applied to a cast steel cam will suffice.
In such a cam I form the tread or wearing surface which is brought into contact
with the tappets separately from the body of the cam, which I form with a recess
on each arm for the reception of the loose tread or wearing surface, so that when
the latter has been secured into position by countersunk bolts or other equivalent
fastening the ordinary contour of the cam is preserved.
In addition to the bolts for securing the tread into position, I sometimes form a
notch or notches at the bottom of the recess first named; and on the loose tread I
form a corresponding rib or ribs or projections to fit in such notches, by which
means I relieve the bolts of the transverse or shearing strains.
I also thicken out the web of the cam arm SO as to form bosses in suitable
positions for the reception of the ends of the bolts and I secure the bolts by cotters,
pins, or nuts, or in any other convenient way. I also arrange for the bolt ends to
project far enough through the bosses or projections formed for their reception on
the cam arm so that they may be driven back as required.
The loose treads I construct either in stamped, forged, rolled, or cast metal;
when rolled, a bar of the required section with ribs or projections at suitable
intervals may be so proportioned as to allow of its being cut off into a number of
separate treads, the treads so cut off being afterwards bent into the required form to
fit the cam.
In some cases I provide chipping pieces or strips on the cam or the tread or both.
In this way cams such as I have herein described may be provided with treads of
hardened steel or other substance so that when such parts become worn or. broken
they can be taken out and replaced at a much less cost than replacing the cam
itself.
Dated this 16th day of November 1895.
R. HEBER RADFORD,
Agent for the Applicant.

page_text: 2443
жасніць аци
I, JOSEPH TRIPPETT, of the Standard Steel Casting Works, Coleridge Road,
Attercliffe, Sheffield, in the County of York, Steel Founder, do hereby declare the
nature of my said invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:--
The cans of quartz crushing machines and the like machines for crushing and
pulverising ores, minerals, and the like substances are subjected to considerable wear
and tear on the surfaces which are brought into contact with the tappets, and the
object of my invention is to secure greater durability in such cams by constructing
them so that their wearing surfaces may be removable and interchangeable.
I effect this object in the following manner, and although my invention is applicable
to such cams whether they are forged, stamped or cast, it is more particularly
applicable to cams which are cast in metal, as for example in malleable iron, cast iron
or cast steel, and as they are more commonly made in cast steel, a description of my
invention as applied to a cast steel cam will suffice.
My invention will be better understood on reference to the accompanying sheet of
drawings, in which Fig. 1 represents the side elevation of one of my improved cams,
Fig. 2 a section taken on the line A. B. and Fig. 3 a section taken on the line C. D.
of the same.
The same letters refer to similar parts throughout the several views.
In such a cam I form the tread or wearing surface, a, which is brought into
contact with the tappets, separately from the body of the cam, b, which I form with a
recess on each arm for the reception of the loose tread or wearing surface, a, so that
when the latter has been secured into position by countersunk bolts, c, c or other
equivalent fastening, the ordinary contour of the cam is preserved.
In addition to the bolts for securing the tread into position, I sometimes form a
notch or notches at the bottom of the recess first named, and on the loose tread I
form a corresponding rib or ribs or projections, d, d, to fit in such notches, or to
extend beyond the end of the cam arm by which means I relieve the bolts of the
transverse or shearing strains.
I also thicken out the web of the cam arm so as to form bosses, e, e, in suitable
positions for the reception of the ends of the bolts, c, c which I securo by cotters, pins,
or nuts, f,f, or in any other convenient way. I also arrange for the bolt ends to
project far enough through the bosses, e, e, so that they may be driven back as
required.
The loose threads, a, I construct either in stamped, forged, rolled, or cast metal,
when rolled, a bar of the required section with ribs or projections at suitable intervals
may be so proportioned as to allow of its being cut off into a number of separate
treads, the treads so cut off being afterwards bent into the required form to fit
the cam.
In some cases I provide chipping pieces or strips, 9, 9, and also longitudinal channels
or grooves, h, on the cam or the tread or both as shewn in the lower arm of Fig. 1.
and in Fig. 3. so that when the tread has been fitted and secured on to the body of
the cam I run molten lead, i, into the spaces with a view to lessen any jar which may
take place.
In this way cams such as I have herein described may be provided with treads of
hardened steel or other substance so that when such parts become worn or broken
they can be taken out and replaced at a much less cost than replacing the cam
itself.

page_text: Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same is to be performed, I declare that what I
claim is.
1. In cams for quartz crushing machines and the like, forming the treads or
wearing surfaces separately from the body of the cam, so that when such parts
become worn or broken they can be taken out and replaced in the manner and for the
purposes substantially as herein described and illustrated.
2. In cams for quartz crushing machines and the like the arrangement and com-
bination of parts and appliances by means of which treads or wearing surfaces of
hardened steel or other substance may be secured into position or taken out and
replaced in the manner and for the purposes substantially as herein described and
illustrated.
DL: 10th to of A 1806
R. HEBER RADFORD,
Agent for the Applicant.