Improvel Appliance for Supporting and Liberating Pit-props used in Coal and other Mines.
Year: 1899

page_text: Date of Application, 1st May, 1899
Complete Specification Left, 26th Oct., 1899-Accepted, 16th Dec.,
1893
PROVISIONAL SPECIFICATION.
Improvel Appliance for Supporting and Liberating Pit-props used in
Coal and other Mines.
I, JAMES GREEN, of Belle Green Lane, Ince, Wigan, in the County of Lancaster,
Collier, do hereby declare the nature of this invention to be as follows:-
:—
This invention relates to an appliance for liberating the pit-props chocks
employed in coal and other mines for supporting the roof.
Hitherto the chocks or props have rested on the floor or on blocks placed on
the floor and when required to be removed have to be cut away often at considerable
risk to the miner from the fall of roof.
By my appliance I am able to liberate and remove the props or chocks without
any cutting and the miner can operate it from a safe distance.
I provide a metal shoe or slipper in the form of a cast iron box of rectangular
or other shape open at the top into which fits loosely a block of wood iron or
the like upon which the prop or chock rests.
The box is provided at one two or more sides-preferably at the two opposite
sides with doors or slides to open through which any loose material in the box
can fall out.
The box is filled with coal dust or other mineral pulverulent material which
will readily flow or fall out when the side doors are opened.
In operation the box is filled with coal dust (or other material) nearly to the
top and the sliding block placed thereon the chocks being then placed in position
thereon in the usual way. To liberate the chocks or props the side doors or slides
are opened and the pressure above forces out the coal dust or loose material allow-
ing the block to sink and thus release the prop or chock. This operation may be
performed at any desired distance.
1000
WM. P. THOMPSON & Co..
6, Bank Street, Manchester, Patent Agents.
Improved Appliance for Supporting and Liberating Pit-props used in
Coal and other Mines.
1. JAMES GREEN. of Belle Green Lane, Ince, Wigan, in the County of Lancaster,
Collier, 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 for liberating the chocks or pit-propз
employed in coal and other mines for supporting the roof.

page_text: DROCKS PRICE ON
the floor and when required to be removed have to be cut away often at considerable
risk to the miner froin the fall of roof.
By my appliance I am able to liberate and remove the props or chocks without
any cutting and the miner can operate it from a safe distance.
It consists essentially of an appliance constructed in the form of a box with
apertures at the sides closed or covered by slides or doors capable of being filled
with loose sand or other material above which is loosely fitted a block upon
which the pit prop rests.
The invention will be fully described with reference to the accompanying
drawings.
Fig. 1. Side elevation in position for supporting the prop or chock.
Fig. 2. Side elevation showing position when lowered to remove the prop or
chock.
Fig. 3. Plan.
Fig. 4. Transverse section.
A is a metal shoe or slipper of cast iron hollow or open at the top and of any
convenient shape preferably rectangular.
At one two or more sides preferably at the opposite sides it is provided with
openings through which loose or granular material such as sand may readily
fall or flow out.
The apertures B are closed by slides or doors C. The slides are fitted in grooves
and are preferably made so that they can be removed or slid out at either end of
the appliance.
While much prefer a sliding door the door may be hinged or pivoted and
provided by a catch which can be released and the door pulled open when desired.
Into the top of the box is loosely fitted or inserted a block of wood iron or
other material upon the top of which the prop or chock rests.
In operation the box is filled nearly to the top with coal dust or other mineral
pulverulent material which will readily flow or fall out when the side doors are
opened.
The sliding block D is placed in position on top of the coal dust or sand and
the chock or prop is then placed in position in the usual way the appliance being
placed in position beneath it with the lower end of the prop resting in the
block D.
To liberate the chocks or props the side doors or slides are opened and the
pressure above forces out the coal dust or loose material allowing the block to sink
and thus release the prop or chock. This operation may be performed at any
desired distance.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed. I declare that what
I claim is―
1. The appliance for supporting and liberating pit props or chocks comprising
an open shoe or slipper of hox form to be filled with loose granular material
provided with openings at the sides through which when opened the material
can flow out and fitted with a block upon which the prop rests substantially as
described.
2. The appliance for supporting and liberating pit props constructed sub-
stantially as described.
Dotad this Put t
11000