Improvements in Machines for Crushing Quartz and other Materials.
Year: 1894

page_text: Date of Application, 22nd May, 1891
Complete Specification Left, 18th Feb., 1895-Accepted, 6th Apr., 1895
PROVISIONAL SPECIFICATION.
Improvements in Machines for Crushing Quartz and other
Materials.
I, HENRY CLOSE 163 Rock Street, in the City of Sheffield Engineer do
hereby declare the nature of my invention to be as follows:-
My improvements in machines for crushing quartz, and other similar materials,
refers more particularly to what are called the tappit spindles, or the vertical
shafts to the bottom ends of which the stampers or shoes are attached, usually
by means of an intermediate coupling head or block.
Heretofore such spindles or shafts have been fitted into the coupling head by
tapering the lower end from its normal diameter for about six inches of its longth,
and fitting this end into a correspondingly tapered hole formed in the coupling-
head. These spindles have only a short life, usually breaking off level with the
coupling-head or thereabouts owing to the jarring caused by the repeated con-
cussions when at work.
I propose to obviate this by giving to the spindle at this point an enlarged
diameter and tapering it down to what I have called the normal diameter of the
spindle or thereabouts.
Thus for example, suppose the spindle is three and a half inches in diameter,
I propose to enlarge it about six inches from its lower end to four and a quarter
inches, and to taper it down to three and a half inches at the extreme end.
As the spindle is usually attached to the coupling head by frictional contact
only, I propose to set down the centre portion of the tapered part of the spindle,
so that only the top and bottom part of tapered part will take a bearing in the
tapered hole in the coupling head.
Or I may reverse this and make the recess in the coupling head only, or if
desired in both the spindle and coupling head.
Or I may leave the tapered parts intact.
Improvements in Machines for Crushing Quartz and other
Materials.
I, HENRY CLOSE 163 Rock Street, in the City of Sheffield, 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 :-
My invention of improvements in machines for crushing quartz and other similar
materials, refers more particularly to what are called the "tappit spindles" of
such machines being the vertical shafts upon the bottom ends of which the stamp
heads and shoes are attached.

page_text: Hitherto such tappit spindles or shafts have been fitted into the coupling head
to which the shoe or stamper is fixed, by tapering the lower end of the spindle
from its normal diameter, for a length of about six inches from its end, and fitting
this reduced end into a correspondingly tapered hole made in the coupling head, in
which it is held by frictional contact. Spindles constructed on this plan have only
a short life, and they usually break off level with the top of the coupling head or
thereabouts, in consequence of the jarring caused by the immense number of
concussions which they undergo.
My improved construction of tappit spindles is illustrated in the annexed sheet
of drawings which represents an elevation of the lower portion of a tappit spindle
made according to the plan which I prefer.
In carrying out my invention, which is to increase the strength of the spindle at
that part which usually fails, I give to the spindle A, at its lower end being that
part which is to fit into the coupling head an enlarged diameter as at B, and taper
it down to the end, C, to what I have called the normal diameter of the spindle A,
or thereabouts, see Fig. 1.
Thus for example, suppose the spindle is three and a half inches in diameter
at A; I propose to enlarge it at B, to four and a quarter inches or thereabouts in
diameter more or less, and to taper it down to three and a half inches or there-
abouts at the extremity of C, the length of the tapered part being adapted to the
coupling-head into which it has to be fitted.
In order to ensure that the tapered part of the spindle should take a firm
frictional bearing in the head, at the top and bottom, and to avoid a central
bearing which would interfere with this perfect contact, I set down or recess the
central portion D, to a reduced diameter as shown. Or may reverse this
arrangement and make a recess in the coupling head only, or in both the spindle
and the head, or in some cases I may omit the recess altogether.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed I declare that what I
claim is :-
1. The improved construction of tappit spindle for crushing machines, as
herein before described, for the purpose specified.
2. A tappit spindle for crushing machines having an enlarged end B, tapered
down to the end C, and provided with a recess D, for the purpose specified, as
hereinbefore described and with reference to the Fig. 1 of the drawings.
Dated the 11th day of February 1895.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.