Improvements in and connected with Means for Securing Cams and the like upon Shafts.
Year: 1897

page_text: Date of Application, 17th Feb., 1897
Complete Specification Left, 25th Oct., 1897-Accepted, 27th Nov.,
1897
PROVISIONAL SPECIFICATION.
Improvements in and connected with Means for Securing Cams and
the like upon Shafts.
A communication from abroad by EDWARD ANDERSON BLANTON, JR., of Walling-
ford, in the State of Pennsylvania, United States of America, Engineer.
I, PHILIP MIDDLETON JUSTICE, of 55 and 56 Chancery Lane, in the County of
Middlesex, Fellow of the Chartered Institute of Patent Agents, do hereby declare
the nature of this invention to be as follows: -
This invention relates to means for securing cams and similar devices upon
shafts, and while it may be used for many and various purposes, it is more
especially adapted for securing the cams of stamp mills upon the shafts of such
mills. The object of this invention is to provide an improved means by which
the cams may be securely held in position when adjusted and may be quickly
A further object
released and replaced when worn out, or for any other reason.
is to provide a shaft by which the cams can be readily arranged in any desired
order or relation to each other.
In carrying out the invention, the shaft is provided with a number of eccentric
bosses or wedge shaped portions extending longitudinally along it and formed
integrally with it. These bosses or wedges may be continuous on the longitudinal
surface of the shaft, or they may be separated by plain spaces.
more
Arranged to be mounted on the shaft are hubs, there being one or
according to the purpose for which the shaft is intended, and these hubs may be
provided with projecting cams such as are commonly used in stamp mills. These
hubs are provided with a number of recesses corresponding with the number
of bosses or wedges on the shaft, the recesses, however, being a little longer on
their curved surfaces than the outer surface of the bosses or wedges, leaving a
space between the thickened portion of the boss or wedge and the radial portion
of the recess.
The inner surface of the bosses is eccentric to the shaft with gradually
increasing radii, and these bosses may be made on a true eccentric, that is, the
outer surface of the wedge may be made to conform to a curve the centre of which
is eccentric to the centre of the shaft, so that the radii of the curve, taking the
centre of the shaft as a basic point, gradually increase, or the outer face of the
bosses may conform to an involute curve, such as is determined by a series of
arcs described from a series of centres on a circle concentric with the shaft.
either case, however, the outer surfaces of the bosses on the shaft may be described
as being eccentric and having gradually increasing radii.
In
The recesses in the hub or hubs, or the like, of course, are fashioned to corre-
spond with the particular curve or eccentricity of the bosses on the shaft to which
they are to be applied, and are made to correspond to the outlines of the outer
surfaces of the bosses.
The bosses or wedges may extend completely around the circumference of the
shaft although the objects of the invention can be accomplished to a greater
or less extent by having the bosses extend partially around the circumference,
leaving for instance, plain spaces between the lowest part of one boss and the

page_text: In the accompanying drawing:
Figure 1 is a perspective view of shaft embodying the invention, with several
cams mounted thereon.
Figure 2 is an enlarged end view of a shaft and hub mounted thereon, the cams
being omitted for the sake of clearness, showing one way of forming the bosses
or wedge shaped portions of the shaft; and
Figure 3 is a similar view, showing another form of bosses or wedges.
In carrying out the invention, the shaft A is provided with a number of eccen-
tric bosses or wedge shaped portions a, extending longitudinally along the shaft
and formed integrally with the shaft, and these may be formed in any desired
mechanical way. In the drawings there are shown ten wedges or bosses arranged
around the circumference of the shaft at equal distances apart, and this, of course,
is simply illustrative, any number of bosses or wedges being supplied according
to the requirements of any particular case. These bosses or wedges may be con-
tinuous on the longitudinal surface of the shaft, or they may be separated by plain
spaces as shown at b, Figure 1.
Arranged to be mounted on the shaft are the hubs C, there being one or more
according to the purpose for which the shaft is intended, and in the present
instance these hubs are shown as provided with projecting cams D, such as are
commonly used in stamp mills. These hubs C, are provided with a number of
recesses c, corresponding with, the number of bosses or wedges on the shaft, the
recesses, however, being a little longer on their curved surfaces than the outer
surface of the bosses or wedges, leaving a space c¹ between the thickened portion
of the boss or wedge and the radial portion of the recess.
The outer surface of the bosses a is eccentric to the shaft with gradually increas-
ing radii, and these bosses may be made on a true eccentric, as shown in Figure 3,
that is, the outer surface of the wedge is made to conform to a curve the centre
of which is eccentric to the centre of the shaft, so that the radii of the curve,
taking the centre of the shaft as a basic point, gradually increase, or as shown
in Figure 2, the outer faces of the bosses may conform to an involute curve, such
as is deermined by a series of arcs described from a series of centres on a circle
concentric with the shaft. In either case, however, the outer surfaces of the bosses
on the shaft may be described as being eccentric and having gradually
increasing radii.
The recesses c on the hub or hubs, of course, are fashioned to correspond with
the particular curve or eccentricity of the bosses on the shaft to which they are
to be applied, and are made to correspond to the outlines of the outer surfaces
of the bosses.
The bosses or wedges are shown as extending completely around the circum-
ference of the shaft, and that is considered the preferable form, although the
objects of the invention can be accomplished to a greater or less extent by having
the bosses extend partially around the circumference, leaving for instance, plain
spaces between the lowest part of one boss and the highest part of the next
succeeding boss. There being a number of bosses on the shaft (ten in the present
instance) it is unnecessary to make them of any great thickness, even at their
thickest part, as it is possible to divide the thickness of the wedge or boss which
would be mechanically sufficient, if a single one were used, into as many parts as
there are bosses or wedges on the shaft. So in the present instance there being
ten bosses or wedges, the thickest portion of each wedge is practically one-tenth
of what would ordinarily be required if single wedge or boss were used.
To illustrate further, suppose the shaft to be six inches in diameter; and if used
with a single wedge or boss, the thickest portion of the wedge might be three-
fourths of an inch, but by dividing this wedge into ten separate wedges, each of
them may be formed one-tenth as thick as the single boss would be. This feature
is of great importance in the manufacture of the shaft, enabling it to be readily
made by machinery, and in no way weakens the hold between the hub and shaft,
or the accuracy of the adjustment of the hub thereon. Further, when the wedges