Year: 1887

page_text: Date of Application, 5th Aug., 1887
--Complete Left, 7th May, 1888
Complete Accepted, 15th June, 1888
We JOHN HARWOOD SIMPSON of 8-Park Place Villas Paddington in the county of
Middlesex Engineer and SAMUEL PORTER of 90 Whitestone Lane Birkenhead in the
county of Chester Engineer do hereby declare the nature of this invention to be as
follows:-
The invention relates to excavators in which a cutting and excavating shovel or
scoop has an oscillating motion imparted to it about a movable fulcrum.
The object is to so construct such excavators that the position of the movable fulcrum
is readily and easily adjusted.
Under our invention a crane derrick or like appliance carried on wheels and
actuated by steam, water, or other convenient power is employed to give the requisite
motion to the excavating shovel or scoop in the usual manner. The said shovel or
scoop is pivotted to a bearing free to slide within or on guides attached to the gib of
the crane or derrick or other suitable carrier. The said bearing is connected to the
rod of a shaft or plunger fitting within a cylinder and receiving motion by means of
fluid pressure. One or more cylinders may be used and the bearings may be directly
connected to the piston rod or may be coupled thereto by means of intermediate
gear.

page_text: We JOHN HARWOOD SIMPSON of 8 Park Place Villas Paddington in the County of
Middlesex, and SAMUEL PORTER of 90 Whetstone Lane Birkenhead in the County of
Chester, 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 :-
The invention relates to excavators in which a cutting and excavating shovel or
scoop has an oscillating motion imparted to it about a movable fulcrum.
The object is to construct such excavators that the position of the movable fulcrum;
is readily and easily adjusted.
Under our invention a crane derrick or like appliance carried on wheels or otherwise
movable and actuated by steam, water, or other convenient power is employed to give
the requisite motion to the excavating shovel or scoop in the usual manner.
The said
shovel or scoop is pivotted to a bearing free to slide within or on guides attached to
or formed with the jib of the crane or derrick or other suitable carrier. The said
bearing is connected to the rod of a piston or plunger fitting within a cylinder and
receiving motion by means of fluid pressure. One or more cylinders may be used and
the bearings may be directly connected to the piston rod or may be coupled thereto by
means of intermediate gear.
In order that our invention may be readily understood I have appended an elevation
of an improved excavator under my invention 1 foundation carried on wheels 2.
3 engine boiler and winding gear; these parts are of any usual or suitable construction.
4 jib carried by the usual raising and lowering appliances 5 and provided with a slot 6
in the direction of the longitudinal axis of the said jib. 7 excavator bucket provided
with a fulcrum 8 free to slide in the slot 6; the fulcrum 8 forms part of a block free
to slide in a slot 8× in the frame of the bucket 7 and is attached to an endless chain 9
passing over pulleys 10 and actuated from the winding gear by an endless wire rope,
chain, or belt 11 so that the fulcrum 8 may be caused to move along the slot 6. The
fulcrum may be attached directly to the piston of a steam cylinder or by gear to the
piston of a special cylinder instead of being actuated by the winding engine cylinders
as shown.
The excavator 7 is caused to cut into the material to be removed by means of the
hauling chain 12 in the ordinary way, and the depth of cut and clearance on the
return stroke are obtained by varying the position of the fulcrum in the slots 6 and 8ª

page_text: and by raising and lowering the jib. The dotted lines show the position of the
excavator at the end of its travel before the jib is lowered to allow of a fresh section
being removed.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
Excavators with a fulcrum adapted to be moved in a direction parallel to the longi-
tudinal axis of the jib for the purpose set forth.