IMPROVEMENTS IN MACHINERY FOR BRINGING DOWN COAL to be as follows:
Year: 1884

page_text: PROVISIONAL SPECIFICATION,
We, GEORGE ARTHUR CROW of 80 Park Road in the city and county of Newcastle
upon Tyne, Engineer, and WILLIAM HEWSON CROW of 45 Rye Hill in the city and
county of Newcastle upon Tyne, Engineer, do hereby declare the nature of said
invention for "IMPROVEMENTS IN MACHINERY FOR BRINGING DOWN COAL to be
as follows:-
"
Our invention consists of a combination of levers, connecting rods, and segmental
blocks, so arranged as to expand or contract the segmental blocks as required.
And of, a mechanical arrangement for working the aforesaid parts, whereby
sufficient power is given forth to burst or bring down the coal.
For this purpose the end of centre connecting rod is screwed, on this a revolving
nut is worked by a worm wheel, this wheel being operated on by a worm. Tho
bearing of the said worm and wheel being in the centre, and attached to the two
outside connecting rods.
It will be thus seen that both sets of levers are worked simultaneously from
a position noar to the horizontal to a vertical position. In working thus from one
position to the other, the segmental blocks aro expanded and the power gradually
increased till the coal is burst.
To apply the machine a hole is first made in the coal just "sufficiently large to
admit the machine when it is contracted to its smallest compass, and the apparatus
is inserted and operated by means of the worm and screw gearing, to expand the
segmental blocks and bring down the coal.

page_text: WC, GEORGE ARTHUR CROW of 86 Park Road in the city and county of Newcastle
upon Tyne Engineer and WILLIAM HEWSON CROW of 45 Rye Hill, in the city and
county of Newcastle upon Tyne, Engineer, do hereby declare the nature of said
" and
invention for "IMPROVEMENTS IN MACHINERY FOR BRINGING DOWN COAL
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
Our invention.consists of a combination of levers, connecting rods, and segmental
blocks so arranged as to expand or contract the segmental blocks as required.
And of a mechanical arrangement for working the aforesaid parts whereby
sufficient power is given forth to burst or bring down the coal.
For this purpose the end of centre connecting rod is screwed; on this a revolving
nut is worked by a worm wheel, this, wheel. being operated on by a worm, the
bearing of said worm and wheel being in the centre and attached to the two
outside connecting rods.
It will be thus seen that both sets of levers are worked simultaneously from
a position near to the horizontal to a vertical position. In working thus from one
position to the other, the segmental blocks aro expanded and the power gradually
increased till the coal is burst,
To apply the machine a hole is first made in the coal, just sufficiently large to
admit the machine when it is contracted to its smallest compass; and the worm
gearing being operated by manual or other power, the levers are caused to expand
the segmental blocks, with a force gradually increasing as the resistance increases,
to split up and bring down the coal.
In order that the said invention may be fully understood, we shall refer to the
'several figures on the sheet of drawings hereunto annexed, the same letters
indicating corresponding parts throughout all the figures.
Figure 1 shews a sectional side elevation and Figure 2 an end elevation with the
levers in a contracted position.
Figure 3 shews a plan of same.
Figure 4 shews an end elevation of worm and wheel.
Figure 5 shows a sectional side elevation with the lovers and segmental blocks
expanded. to their utmost extent.
Figure 6 shews an end elevation of- same.
From the drawings it will be seen that by turning the worm A, by means of
a ratchet or handle on end H, motion is given to worm wheel B the effect of which
is that the centre screwed connecting rod C moves the levers D, either towards the
vertical or horizontal position as required. The outside connecting rods E, form
the fulcrum of' levers F which levers are also operated on by the worm, and wheel
and screw on end of centre connecting rod C, and are also worked either to or
from the horizontal or vertical position. The levers are jointed to the segmental
blocks G by pins as shewn. It will be thus seen that both sets of levers are
worked simultaneously in opposite directions. The effect of the combined action
of the worm A, worm wheel B and screw on end of rod C together with the lever
arrangement gives a great and gradual increase of power as the segmental blocks
are expanded till the coal is burst or brought down.
To apply the machine a hole is first made in the coal just sufficiently large to
admit the machine when it is contracted to its smallest compass as shown in
Ticure 1

page_text: Having now particularly ascertained and described the nature of our said
invention and in what manner the same is to be performed.
We declare what we claim is
1st In a machine for bringing down coal-The application of levers operating
segmental blocks substantially as shewn and described.
2nd In a machine for bringing down coal-The combined arrangement of the
following parts. Worm, worm wheel, screw, connecting rods or bars and levers
operating and expanding segmental blocks simultaneously. Constructed and
operating substantially as shewn and described.
Dated the 23rd day of December 1884.
Witness:
T. J. DANSON, F. Inst. P.A.,
Consulting Engineer & Patent Agent,
Newcastle on Tyne.
GEO. A. CROW,
W. H. CROW,