Year: 1894

page_text: being date of first Foreign Application (in 27th Apr., 1891
United States of America)"
Date of Application (in United Kingdom), 16th Oct., 1894
"
Complete Specification Left, 16th. Oct., 1894-Accepted, 22nd June..1895
Date of Application (in United Kingdom), 16th Oct., 1894
Complete Specification Left, 16th, Oct., 1894-Accepted, 22nd June, 1895
I, HERMAN BERNER,, of 1649 Gallagher Street, Louisville, in the, County of
Jefferson, and State of Kentucky, United States of America, 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 relates to improvements in expanding mandrels; and it consists in
the particular construction and arrangement of parts which will be fully described
hereinafter and especially pointed out in the claims."
***
.....
The object my invention is to provide an expanding mandrel having at each end
tapering sleeves which receive the expanding devices adapted to be expanded by
endwise motion over the tapering sleeves, the said tapering sleeves and wedges at
each end extending in the same direction so that by moving the mandrel endwise
in one direction will simultaneously loosen both sets of expanding wedges, and
when forced in the opposite direction, will simultaneously tighten, the same, all of
which will be more fully set forth hereinafter.
In the accompanying drawings,
Figure 1, is a' longitudinal vertical section of an expanding mandrel which
illustrates my, invention complete.
1
Fig. 2, is a detached perspective view of a series of the expanding wedges.
Fig. 3, is a detached perspective view of an expanding sleeve adapted, to be
placed on the outside of the expanding wedges.
Referring now to the drawings, A indicates the mandrel core which is provided
at one end with the screw thread B and at the opposite end with an inwardly
tapering sleeve C. At the opposite end of this mandrel inside of the screw
threaded portion B is another tapered sleeve D similar to the one C, and which
extends in the same direction as is clearly illustrated. Placed upon the mandrel A
between the tapering sleeves C and D, is a straight sleeve J slightly larger in
diameter than the diameter of the inner thicker end of the sleeve D as shown and
which is provided at its opposite end with a recess a of a proper length to permit
it to pass over the small inner end of the tapering sleeve Cat the opposite end of
the mandrel.
Placed around each of the tapering sleeves C and D, are a series of tapering
wedges E which are provided at. their thickest end with grooves G, in which
grooves a contracting, binding spring b is placed for the purpose of holding the
wedges normally together as shown in Fig. 2. As will be clearly understood when
these tapering wedges are forced end wise upon the tapering sleeves C and D they
are expanded for the purpose of engaging the inner periphery of a hub or other
object which it is desired to clamp.
J.

page_text: Placed outside of the tapering sleeve D, is a sleeve H surrounding the screw
threaded portion B, and engaging the said screw threaded portion or the nut I.
When the inner nut is turned inward the sleeve H is forced inward engaging the
thickened end of the wedges E, which in turn have their thinnest edges engage the
projecting edge of the sleeve J, thus forcing it end wise. The opposite end of this
sleeve Jengages the thickened end of the tapering wedges at the opposite end of
the mandrel and simultaneously force them endwise as will be clearly understood,
thus causing the two sets of tapering wedges to simultaneously expand by the
end wise movement of the nut on the outer end of the mandrel, and thus clamp the
desired object. The outer nut I is then tightened against the inner nut, thus
locking it so that the tapering wedges are held permanently in the adjusted
position.
I am aware that it is not new to provide a tapering expanding device at each
end of a mandrel, but in these incidents the tapers have extended in opposite
directions so that each device was separately forced end wise, and this made it very
difficult to detach the mandrel from the device clamped for the reason that when
the mandrel was moved in one direction it would loosen one set of expanding
devices while at the same time it tightened the other.
It will be noticed that by the turning of the nut I, both of these expanding
devices were simultaneously expanded and engaged the object to be clamped by a
single movement which is a great saving of time over the ordinary construction
where the tapers extend in opposite directions requiring a separate movement for
each set of expanding devices. Another great advantage in this construction is,
that when it is desired to loosen the mandrel from the device clamped it is only
necessary to loosen the nut I, and to tap the mandrel end wise when both sets of
expanding devices will be simultaneously loosened from the object clamped and it
can be removed. This it will be readily understood is a great advantage over
devices of this character previously constructed.
The inner end of the opening made in the short sleeve H, is made tapering as
shown at c for the purpose of passing over the tapered outer end of the sleeve D.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. An expanding mandrel comprising a rod having two separated tapers extending
in the same direction, expanding devices surrounding said tapers, an end wise
movable operative connection between and abutting against the adjacent ends of
said expanding devices, and a means for forcing endwise one of the said expanding
devices and through the medium of said connection the other expanding device,
substantially as shown and described.
2. An expanding mandrel comprising a shaft or rod having two tapering sleeves
with their tapers extending in the same direction, the shaft having a screw threaded
portion outside of one of the tapers, expanding devices surrounding the said tapers,
a sleeve between the said expanding devices and engaging their adjacent ends, and
a nut upon the screw, threaded portion adapted to engage one end of the ding
devices for moving it endwise and through the medium of the said sleeve our
expanding device simultaneously for the purpose described.
'
Dated this 16th day of October 1894.
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.