Improvements in the Construction of the Cams and Cam Shafts of Stamp Mills, and in the Means of Fixing or Attaching the said Cams to their Shafts, applicable also for Securing other Rotating Parts or Members to their Driving Shafts.
Year: 1897

page_text: - Date of Application, 4th Oct., 1897
-Date of Application, 4th Oct., 1897
Comprete Specification Left, 19th May, 1898—Accepted, 25th June, 1898
Improvements in the Construction of the Cams and Cam Shafts of
Stamp Mills, and in the Means of Fixing or Attaching the said
Cams to their Shafts, applicable also for Securing other Rotating
Parts or Members to their Driving Shafts.
I, EDWARD JOHN WAY, General Manager of the George Goch Amalgamated Gold
Mining Company Limited, near Johannesburg, in the South African Republic, do
hereby declare the nature of this invention to be as follows:-
-
This invention relates chiefly to the construction of the cams and cam shafts of
stamp mills employed in the reduction of ores, and also to an improved means of
fixing or attaching the said cams to their shafts. The invention may however
also be utilized as a means for securing wheels, pulleys or other rotating members
or mechanical contrivances to their driving shafts.
As applied to the cams and cam shafts of stamp mills, it is designed with the
object of providing an efficient means of fixing the cams so as to prevent the
possibility of their working loose when running; to enable the cams to be readily
detached and attached or replaced on the shaft without interfering with the several
other cams or mechanism fixed thereon, and to permit the cams to be easily adjusted
or arranged on the shaft to give any desired order of drop of the stamps.
In carrying out the invention the cam is constructed in halves. Each half of the
boss is formed with a part projecting into or overlapped by a portion of the other,
the overlapping portion being formed with one or more internal grooves or recesses
into which correspondingly shaped projections provided on the entering portion of
the other half of the boss fit, to lock the halves in position on the shaft, the shaft
acting as a key and preventing their becoming detached. These locking grooves
and projections are so formed as to necessitate one of the halves of the cam being
drawn longitudinally along the shaft to disengage the other and before the cam can
be detached from the shaft.
Each half of the boss of the cam is bored out eccentrically relative to the longi-
tudinal axis of the shaft, thereby forming a projection or ledge and a tapering
recess between the boss and the shaft. Within each of these tapering recesses are
fitted correspondingly shaped curved tapering pieces, keys or wedges.
The shaft is machined or otherwise constructed of a (preferably regular) polygonal
cross-section. I prefer to employ a shaft of decahedral section, as this materially
facilitates the setting and fixing of the cams on its flats or faces to give any
required order of drop of the stamps.
The curved tapering keys or wedges are preferably formed with flats or faces
on the inside corresponding to the shaft.

page_text: Improvements in the Construction of the Cams and Cam Shafts of
Stamp Mills, and in the Means of "Fixing or Attaching the said
Cams to their Shafts, applicable also for securing other Rotating
Parts or Members to their Driving Shaits.
I, EDWARD JOHN WAY, General Manager of the George Goch Amalgamated Gold
Mining Company Limited, near Johannesburg, in the South African Republic, 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 relates chiefly to the construction of the cams and cam shafts of
stamp mills employed in the reduction of ores, and also to an improved means of
fixing or attaching the said cams to their shafts. The invention may however
also be utilized as a means for securing wheels, pulleys or other rotating members
or mechanical contrivances to their driving shafts.
As applied to the cams and cam shafts of stamp mills, it is designed with the
object of providing an efficient means of fixing the cams so as to prevent the
possibility of their working loose when running; to enable the cams to be readily
detached and attached or replaced on the shaft without interfering with the several
other cams or mechanism fixed thereon, and to permit the cams to be easily adjusted
or arranged on the shaft to give any desired order of drop of the stamps.
For this purpose the cam is constructed and fixed as will be described with
reference to the accompanying drawings.
Fig. 1 is a transverse section of the cam shaft with side view of a cam on it, and
Fig. 2 a plan of same.
The cam A is constructed in halves B, C. The halves be of the boss D are each
formed with a part b c respectively projecting into or overlapped by a portion of
the other. The parts 22, of the boss, are each formed with an internal transverse
groove or recess de, into which grooves correspondingly shaped projections d' e¹
formed on the overlapped or entering portions 6 c¹ of the boss fit. The halves
of the cam are by this means locked in position on the shaft, the shaft acting as a
key and preventing them from becoming detached. These locking grooves and
projections are so formed and engaged that one of the halves of the cam has to be
moved along the shaft E in order to disengage the halves from each other and from
the shaft. Although I have shewn each half of the boss with only one groove
and one corresponding projection two or more such grooves and corresponding pro-
jections may be made.
The halves bc of the boss D are bored out eccentrically to the axis of the shaft E,
so as to present shoulders f f¹ and tapering recesses g g¹.
The shaft E is of preferably regular polygonal cross-section. In the case of a
five stamp mill I prefer to employ a shaft of decagonal section but any section
having a number of sides which is a multiple of the number of stamps (five) may be
employed, as this materially facilitates the setting of the cams so as to give the
order of drop of the stamps.
Within each of the tapering recesses y g' are fitted curved tapering pieces or
wedges h h¹, preferably formed on the inside with flats corresponding to those on
the shaft E. The recesses g g₁ and the keys h h are arranged relatively to the
direction of rotation so that they always act to tighten the cam on the shaft.
Obviously wheels, drums, eccentrics or other rotating parts may be fixed on shafts
in the manner described.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I claim
is:-
1. A cam for a stamp mill made in halves each half of the boss being formed with
a groove to receive a correspondingly shaped projection of the other, or with several
such grooves and projections, substantially as described.
2. The combination of a cam such as above referred to with a shaft of polygonal
section a pair of curved tapering wedges fitted within recesses formed by boring
the halves of the boss eccentrically, substantially as described.
3. The method of fixing cams, wheels, pulleys or other rotating parts on their
driving shafts substantially as described with reference to the accompanying draw-
ings.
ABEL & IMRAY,
Agents for the Applicant.