Improved Wedge Mechanism for Winning Coal, Minerals, and the like.
Year: 1898

page_text: Date of Application, 23rd May, 1898-Accepted, 30th July, 1898
COMPLETE SPECIFICATION.
Improved Wedge Mechanism for Winning Coal, Minerals, and
the like.
I, FRITZ HERMANN HEISE, of No. 15, Essener Strasse, Gelsenkirchen, in the
German Empire, Mine Inspector, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
scertained in and by the following statement:--
My invention relates to an improvement in apparatus of the kind described in
my British Patent No. 12294 of 1897.
In the aforesaid patent there is described an arrangement for winning stone.
and the like by means of a wedge mechanism, which is actuated by a screw spindle,
the turning whereof effects the displacement of a pair of wedges in opposite
directions.
In this mechanism the arrangement of the screw spindle with respect to the
wedges is such, that either the said spindle does not alter its position with regard
to the outer plates of the device during the revolution, or that the resistance which
both wedges encounter, is the same for each of them, so that in both instances a
uniform pressure is created.o
1. over the whole length of the outer plates, and there
is attained a certain release of both wedges when the screw spindle is revolved
back again
In the invention which forms the subject of the present application, the one
wedge has bored through it a smooth hole through which the screw spindle passes
and bears at one end of the said wedge a nut revoluble against the same, the
threading of which nut corresponds to that of the spindle. The other end of the
spindle is shaped in T form and the projections of the said end engage in corres-
ponding cavities in two wedges in such a manner that the displacement of the said
wedges both upwards and downwards becomes possible. When the nut is revolved,
the first named wedge, which is forked at the thin end, is caused to pass between
the other two wedges in such a manner that the forked projections of the first
wedge allow the projecting T piece of the spindle to pass between them.
The invention is illustrated in the accompanying drawing in which
Figure 1 is a view of the wedge mechanism.
Figure 2 is a section of Figure 1 on the line a x.
The
The screw spindle a passes through the smooth bore hole of the wedge b, having
the nut e revolubly connected therewith; the thread of the nut e engages with
that of the spindle a. The other end of the spindle a is T shaped. The two
projections of the T piece engage in corresponding cavities of the auxiliary
wedges shown in dotted lines in Fig. 1 of the drawing, and hold these wedges
in such a position that they can be moved upwards and downwards.
wedges lie with their outer surfaces parallel in the original position of the
mechanism supported upon the inclined surfaces of the wedge b. When the nut a
is revolved by means of a handle or the like, the wedge b advances between the
wedges in such a manner that the forked projections of the said wedge permit
the parts d to pass between them. The two outer wedges are moved with parallel

page_text: outer surfaces. In addition to the uniform pressure obtained over the whole length
of the wedges upon the advance of the nut e, and of the certain release of the wedges
on the reversal of the same, my improvement has the special advantage that the
lift obtainable thereby, is relatively large, because the wedge b in consequence of
its special form can move a considerable distance over the connecting point of the
wedges c¹³ with the spindle a; moreover, the spindle remains continuously parallel
to the application surface of the wedge and therefore in the position most favour-
able for this action.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is: -
The improved wedge mechanism for the winning of coal, stone or the like, con-
sisting essentially of a screw spindle such as a, of a revoluble nut such as e engag
ing with the spindle, and attached to the wedge b, and of two auxiliary wedges c¹²
engaging upon the projections d of the aforesaid screw spindle, the said parts
being so connected with one another that the wedges are capable of being
displaced over the surface of the wedge with their outer sides parallel to each
other, and that the forked points of the wedge a admit the points & between them-
selves, substantially as and for the purpose above described.
Dated the 23rd day of May 1898.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.