An Improved Appliance to be Used in Conjunction with Boring Machines for Mining Operations.
Year: 1894

page_text: Date of Application, 14th Feb., 1894
Complete Specification Left, 9th Nov., 1894--Accepted, 15th Dec., 1894
PROVISIONAL SPECIFICATION.
An Improved Appliance to be Used in Conjunction with Boring
Machines for Mining Operations.
We, ABRAHAM GRAY, Manager, and GEORGE TARBIT, Engineer, both of
South Skelton Mines, Boosbeck, in the County of York, do hereby declare the
nature of this invention to be as follows:-
This invention relates to an appliance to be used in conjunction with boring
machines for mining operations to which it acts as a means for holding the boring
machine in the working position and for taking the thrust which is put upon the
drill.
The appliances of the kind to which our invention relates have usually been
constructed in the form of an ordinary square bar with a wedge shaped end to be
driven into the working and a cross bar to slip on the said bar to be adjustable to
any position, the wedge ended bar being the holding up or carrier bar and the
cross bar the resistance bar for taking the thrust from the boring machine as the
feed is put on to the drill.
It is found in practice that an appliance so constructed is open to objection in as
much as the wedge shaped end although adapted to enable the carrier bar to be
driven into the working so as to serve its purpose in retaining its hold fairly well
against the thrust of the boring apparatus, that is to say that the thrust of the
boring apparatus as transmitted through the resistance bar does not readily cause
the carrier bar to loose its hold in the working which would of course bring the
operation of boring to a standstill. Yet the wedge shaped end often fails to
support the strain which is thrown upon the carrier bar in the direction of
supporting the weight of the boring apparatus, for instance when the boring
machine is applied to the working in the horizontal position with its outer end
bearing upon the free end of the carrier bar.
A further defect arises from the tendency of the cross or resistance bar to slip
along the carrier bar to which it is secured in any required position by frictional
contact only, which slipping usually occurs when the line of the thrust from the
boring apparatus is parallel with and too close to the line in which the carrier bar
extends from the face of the working into which it is driven.
The object of our invention is to furnish an appliance of this sort which is more
suitably adapted to the conditions in which the boring operations in mines have to
be carried out.
In carrying out our invention we in the first place, instead of making the carrier
bar wedge shaped, taper it at one side in the opposite direction so that the foot of
the bar is wider than the bar itself. This necessitates a hole being cut into the
face of the working to correspond to the tapered foot of the carrier bar, that is
with a sloping under cut to one side. The carrier bar being inserted into such a
hole a wedge is driven in at the opposite side to the under cut and a perfectly
reliable hold obtained in the working for resisting any outward thrust of the
boring apparatus, at the same time by withdrawing the wedge the carrier bar can
be withdrawn at any time. And in the second place in order to prevent all risk of
the resistance bar slipping from its intended position on the carrier bar we provide
a series of sockets in the carrier bar for the reception of a tenon on the end of the
said resistance bar by which this bar is- adjustable to any required position, and is

page_text: necessarily a fixture in any such position in regard to any thrust received from the
boring apparatus.
Dated this 13th day of February 1894.
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees,
Agent for the Applicants.
COMPLETE SPECIFICATION.
An Improved Appliance to be Used in Conjunction with Boring
Machines for Mining Operations.
We, ABRAHAM GRAY, Manager, and GEORGE TARBIT, Engineer, both of
South Skelton Mines, Boosbeck, in the County of York, 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 to an appliance to be used in conjunction with boring
machines for mixing operations to which it acts as a means for holding the boring
machine in the working position and for taking the thrust which is put upon the
drill.
The appliances of the kind to which our invention relates have usually been
constructed in the form of an ordinary square bar with a wedge shaped end to be
driven into the working and a cross bar to slip on the said bar to be adjustable to
any position, the wedge ended bar being the holding up or carrier bar and the
cross bar the resistance bar for taking the thrust from the boring machine as the
feed is put on to the drill.
It is found in practice that an appliance so constructed is open to objection
inasmuch as the wedge shaped end, although adapted to enable the carrier bar to
be driven into the working so as to serve its purpose in retaining its hold fairly
well against the thrust of the boring apparatus, that is to say that the thrust of
the boring apparatus as transmitted through the resistance bar does not readily
cause the carrier bar to loose its hold in the working which would of course bring
the operation of boring to a standstill. Yet the wedge shaped end often fails to
support the strain which is thrown upon the carrier bar in the direction of
supporting the weight of the boring apparatus, for instance, when the boring
machine is applied to the working in the horizontal position with its outer end
bearing upon the free end of the carrier bar.
A further defect arises from the tendency of the cross or resistance bar to slip
along the carrier bar to which it is secured in any required position by frictional
contact only, which slipping usually occurs when the line of the thrust from the
boring apparatus is parallel with and too close to the line in which the carrier bar
extends from the face of the working into which it is driven.
The object of our invention is to furnish an appliance of this sort which is more
suitably adapted to the conditions in which the boring operations in mines have to
be carried out.
In describing how our invention is to be carried into effect we will refer to the
annexed sheet of drawings in which Figure 1 illustrates in side view our mining
appliance erected in position ready for use, corresponding to which Figure 2 is an
end elevation, and Figure 3 a view taken in plan. In the figures a is the holding
up or carrier bar, b is the cross or resistance bar. In the first place, instead of
making the carrier bar wedge shaped as hitherto, we taper it at one side in the
manner shown at a', so that the foot of the bar is wider than the bar itself.
This necessitates a hole being cut into the face of the working to correspond to
the tapered foot of the carrier bar, that is with a sloping undercut from one side
as shown in Figure 1. The carrier bar a being inserted into such a hole a wedge c
is driven in at the opposite side to the undercut and a perfectly reliable hold

page_text: obtained in the working for resisting any outward thrust of the boring apparatus,
at the same time by withdrawing the wedge c the carrier bar can be withdrawn at
any time. And in the second place, in order to prevent all risk of the resistance
bar b slipping from its intended position on the carrier bar a we provide a series of
sockets d'in the carrier bar for the reception of a tenon e on the end of the said
resistance bar by which this bar is adjustable to a series of positions and is
necessarily a fixture in any such position in regard to any thrust received from the
boring apparatus.
But in practice it is found to be an impediment to the utility of an appliance
such as we have herein before described if the boring apparatus connected with it
be not adjustable to any position taken radially from the centre line of the
resistance bar. We therefore prefer to make the following provision for this.
Either the arm b of the resistance bar is made cylindrical so that the boring
apparatus can be adjusted to extend therefrom in any radial direction, or the
tenon e' is made round and fits into a round hole d', and is secured in any required
position by the nut f, in which case the arm b' may be either rectangular or
cylindrical as preferred.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
Firstly. In mining appliances of the kind herein before referred to, the use in
combination with a wedge of a carrier bar having a tapered foot, as and for the
purpose as hereinbefore described with reference to the accompanying drawings.
Secondly. In mining appliances of the kind hereinbefore referred to, the general
arrangement or construction of parts in which a tapered foot and wedge is used
for securing the carrier bar into the face of the working, and a socket and tenon
arrangement is used for securing the resistance bar in its intended position, all
combined together substantially as herein before described and illustrated.
Dated thie 8th day of Nanombor 1904
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees,
Agent for the Applicants.
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees,
Agent for the Applicants.