Improvements in Apparatus for Excavating.
Year: 1892

page_text: Date of Application, 6th May, 1892
Complete Specification Left, 4th Feb., 1893-Accepted, 1st Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Excavating.
I, THOMAS WHITAKER, of Horsforth, near Leeds, in the County of York,
Contractor, do hereby declare the nature of the said invention to be as follows:-
This invention relates to excavating apparatus known as a crane navvy in which
the excavating bucket is pivoted to the jib of a crane such as described in the
Specifications of my former Patents Nos. 16701 of 1886, 2757 of 1887 and 946 of
1889.
The present improvements primarily refer to the apparatus when constructed
with a rack on the radius arm by which it is drawn in and out and the radius
reduced and is designed to provide mechanism whereby the rack can be actuated
without manual labour.
It consists essentially in the combination with the rack pinion of mechanism such
as a shaft with bevel gear and friction device for throwing the same into or out of
gear or a pitch chain working from the jib head to the pinion shaft or shaft geared
therewith whereby the motion of the winding chain or of the pulley at the jib head
over which it passes may be conveyed to and utilized for moving or actuating the
radius rod of the bucket.
In carrying out the invention I connect a bevel toothed wheel or friction disc to
the guide pulley at the head of the jib over which the winding chain passes which
is thus moved backwards and forwards as the chain is wound up, or a toothed wheel
to receive a pitch chain may be employed instead.
Gearing or engaging with the bevel wheel is a second wheel carried on the end of
a shaft running longitudinally of the jib the lower end of which carries another
bevel wheel.
The wheel at the lower end of the shaft gears with two bevel wheels loose on a
cross shaft with clutch boxes on their faces which engage with a double ended
friction cone capable of being moved to and fro on a feather on the shaft.
On the cross shaft is a fixed pinion which gears with a pinion on and actuates
the shaft from which movement is imparted to the rack and radius arm.
Where a pitch chain is employed to convey the motion from the jib head pulley
it passes over a toothed wheel on a cross shaft from which the movement is
conveyed by suitable gearing or wheels to rack pinion and rack of radius arm.
By this arrangement manual labour for moving the arm of the bucket to and fro
is dispensed with and the movement of the jib head pulley utilized for the purpose
without attaching any additional mechanism direct to the crab or winch for the
purpose.
1000
Dated this 5th day of Mar 1902.
WM. P. THOMPSON & CO.,
6, Bank Street, Manchester, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Excavating.
I, THOMAS WHITAKER, of Horsforth, near Leeds, in the County of York,
Contractor, 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 excavating apparatus known as a crane navvy in which

page_text: box whereby the motion of the winding chain is utilised for actuating the radius rod
of the bucket to and fro longitudinally substantially as described.
2. A crane navvy constructed with the combination and arrangement of parts
substantially as and for the purpose described and shown.
Dated this 3rd day of February 1893.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.