IMPROVE- MENTS IN MACHINERY OR APPARATUS USED IN MINES
Year: 1887

page_text: Date of Application, 18th Feb., 1887
Complete Left, 3rd Oct., 1887
Complete Accepted, 25th Nov., 1887
HENRY HIBBERT 37 Kirke White Street East Nottingham Engineer and WILLIAM
HORSFIELD Kimberley Nottingham Engineer both of the Town and County of the
Town of Nottingham do hereby declare the nature of our said invention for IMPROVE-
MENTS IN MACHINERY OR APPARATUS USED IN MINES to be as follows:-
Our Improvements consist in forming the Props or Supports for the Roofs in Mines,
with caps, made from Iron Tubeing or other suitable sections of materials.
We place
springs of required strength between the prop and the cap. The props or caps are
provided with slots, having pins or cotters so arraigned that the cap may slide along
the prop to allow of a given reduction in their length, when depressions of the Roof
takes place.

page_text: HENRY HIBBERT of Nottingham Engineer and WILLIAM HORSFIELD of Kimberley
Engineer 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:-
And in order that our Invention may be freely understood and readily carried out
and into effect we will proceed to describe the accompanying sheet of drawings
reference being had to the letters marked thereon. Fig. 1. is a sectional elevation of
a portion of our improved prop with the cap B. welded up from the same material as
the prop or formed of a seperate part attached by pin D or other suitable means.
Fig. 2 is a side elevation of one of our improved Props.
F. 3 is a longitudinal sectional elevation of the same Prop.
Fig. 4 is a longitudinal sectional elevation shewing the application of our Improve-
ments to ordinary Timber Props.
Similar letters refer to similar parts throughout the several views.
In these views A is a tube of wrought iron or other suitable material fitted at each
end with caps C. or either or both ends may be welded up as shewn at B in Fig. 1.
H is another tube sliding freely over the tube A and fitted with a cap C', and also
provided with a pin or cotter I. which passes through a slot J formed in the
Prop A.
In the tube H we insert one or more spiral or other suitable spring or springs E
bearing at one end against the inside of cap ( in tube H and at the other end on the
upper part of cap C. on tube A in such a manner that the Prop is rendered elastic or
When pressure froi
compressible to a certain extent in the direction of its length.
the Roof of a mine bears upon the cap C¹ and causes the spring E to be compressed
and the Prop to be correspondingly shorter in the direction shewn by the arrow in
Fig. 2 thereby preventing cracking or breaking of the Props during depression of the
Roofs or upheaval of the floors of mines.
Fig. 4 represents the application of our Invention to Timber Props. The tube H
and spring E in this case being larger in diameter, are arranged as previously described
and placed on Props of Timber K, and are used as in the ordinary methods of support.
The slots in this arrangement are formed in the tube H and the pin or cotter Lis
placed in the Timber prop K all as shewn in the drawings herewith.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
1. The particular arrangement and construction of Mine Props as shown in Figs. 1.
2. 3 and 4 of the annexed drawings whereby Props are rendered elastic or compressible
to a limited extent in the direction of their length as set forth and substantially as
herein before described and illustrated by the drawings.
2. The use and application of one or more springs between seperate parts of Mine
Props as hereinbefore described and illustrated by the drawings.
1007
HENRY HIBBERT.
WILLIAM HORSFIELD.