Improvements in Apparatus for Excavating.
Year: 1899

page_text: Date of Application, 10th May, 1899
Complete Specification Loft 9th Mar 1900 Accented 14th Apr. 1900
*
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Excavating.
...
I, THOMAS WHITAKER, of Horsforth, near Leeds, in the County of York, Con-
tractor, do hereby declare the nature of this invention to be as follows:
This invention relates to improvements. in excavating apparatus or what are
known as steam crane navvies which are intended to excavate trenches or the
like below the ground level upon which the base of the crane rests.
I make the jib of triangular formation or of other suitable shape extending out
a considerable distance beyond the pivoted upright member.
149
At the lower end of the upright member is placed a drum or pulley actuated
by suitable gearing either by hand or by power and at the outer end of the jib
is pivoted a swinging or oscillating cradle by which the bucket arm is suspended
and operated.
The cradle is provided with two drums or pulleys one of which receives a
driving rope band or chain from the drum or pulley on the upright member and
the other a rope attached at both ends to the bucket arm.
The cradle is also provided with two or more guide rollers between which the
bucket arm slides.
The bucket arm and bucket are suspended by a rope attached to the arm at
both ends by means of T channel or angle iron stays which are movable or
adjustable in position according to the depth of excavation required screws are
also provided to take up the slack of the ropes and keep them tight.
The rope that suspends the bucket is passed round the drum and by turning
the drum in one direction or the other the bucket is raised or lowered to the
desired height. The rope drum is operated by the drum at the other end a rope
passing from one to the other.
The excavating is performed by the ordinary crane rope and the arm and
bucket may when raised into a horizontal position be drawn backwards and
forwards by the suspending rope.
L
Cl
1000
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
I, THOMAS WHITAKER, of Horsforth, near Leeds, in the County of York. Con-
tractor, do hereby declare the nature of this invention and in what manner the
[Price Sd

page_text: same is to be performed, to be particularly described and ascertained in and by
the following statement:-
-
This invention relates to improvements in excavating apparatus or what are
known as steam crane navvies which are intended to excavate, trenches or the
like below the ground level upon which the base of the crane rests.
The invention will be fully described with reference to the accompanying
drawings.
Fig. 1. Side elevation.
Fig. 2. Plan.
Fig. 3. Side elevation showing the bucket in a different position.
Fig. 4. Side elevation of detail enlarged.
Fig. 5. Plan of same.
The jib A is of triangular lattice work formation supported by and extending
out a considerable distance from the upright pivoted member B.
To the upright member B is fitted a winch or crab C with drum e actuated by
suitable gearing either by hand or power and at the outer end of the jib A is
pivoted an oscillating cradle D in which the bucket arm E is suspended and
in which it is free to move or slide longitudinally. The cradle D is provided with
two or more guide rollers e between which the bucket arm slides.
At the outer end of the jib A I attach a drum or winch F actuated by the rope
or chain pulleys G and H. The pulleys G and H are driven by ropes or chains K
from the winch or crab C on the upright member B the ropes being so attached
or arranged that the pulleys may be rotated in either direction.
A rope or chain L or two such ropes or chains are attached to the drum Fin
such a way that when the drum is rotated one end of the rope or chain is
wound up and then unwound. The free ends of the rope or chain are attached
to the opposite ends of the bucket arm E to the cross stays M which may be of
Tangle or other cross section. The cross stays M may be adjustable in position
if desired. The rope or chain is attached by means of screws m by which the
slack can be taken up and the rope or chain kept tight.
In operation the drum F is turned in one direction or the other by means of
the winch C the ropes or chains K on the pulleys G and H and the bucket N is
by the rope or chain L raised or lowered to the desired height.
The excavating is performed by the crane rope O' attached to the bucket N and
operated by the winch P.
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:-
Excavating apparatus particularly applicable for excavating trenches having
the several parts constructed and arranged in combination substantially as
described.
Dated this 9th day of V 1000
WM. P. THOMPSON & Co.,
Manchester, Liverpool and London,
Patent Agents.