Improvements in Potato Diggers.
Year: 1891

page_text: Date of Application, 23rd Apr., 1891
Complete Specification Left. 23rd Jan., 1892-Accepted, 23rd Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Potato Diggers.
1, JOHN MARSHALL, of the firm of Alexander Jack and Sons, of Maybole,
in the County of Ayr, North Britain, Agricultural Implement Makers, do hereby
declare the nature of this invention to be as follows :-
:-
This invention which relates to improvements in potato diggers has reference to
that class of potato diggers known as Hanson's potato diggers, and consists in
further improvements or additions to those described in my former Letters Patent
Specification No. 5539 of 27th March 1884, and has for its object the provision of
a simple and efficient acting brake.
The said brake is caused to act on the inside periphery of one of the wheels
through the medium of a suitably mounted lever which is acted on by the pivotted
cross lever on the front end of the main beam in such a manner that on the main
Bock elevating hand lever being lowered the said brake is applied to the wheel, the
sock raised, and the gear clutch taken out of gear, and the motion of the disc and
forks, stopped, as hitherto.
Dated the 21st day of Anvil 1801
JOHNSONS,
115, St. Vincent Street, Glasgow, Petitioner's Agents.
COMPLETE SPECIFICATION.
Improvements in Potato Diggers.
1, JOHN MARSHALL, of the firm of Alexander Jack and Sons, of Maybole, in
the County of Ayr, North Britain, Agricultural Implement Makers, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement :-
This invention which relates to improvements in potato diggers, has reference to
that class of potato diggers, which are known as "Hansom" potato diggers, and
consists in further improvements or additions to those described in the Specification
of my former Patent No. 5539 of 27th March 1884, and has for its object to
provide a simple and efficient acting brake which can be instantly applied when
travelling empty, or round a headland, or down sloping land.
As will be seen from the accompanying drawings, Figures 1 and 2 of which are
side elevation and plan of a part of a digger having my improvements attached.
In accordance with my said invention I cause the brake block A to act upon the
inside periphery of the rim b of one of the main wheels B. The said brake
block A is suitably mounted on the one end of a pivoted lever C whose pivot c is
carried in a boss c¹ of the main beam D; the said boss c¹ being provided with a
check or snug e into which a projection of the lever C engages when not in gear
and is thereby retained in position. The other end of of this lever C is suitably
shaped and provided with an adjusting screw c so as to enable the pivoted cross
lever E, to actuate the said brake lever and block that is by actuating or depressing
the main sock elevating hand lever F, the brake block A is caused to bear upon
the inside periphery of the wheel B, as well as to raise the sock, and withdraw or
take the gear clutch out of gear and so stop the motion of the revolving disc and
forks. The said adjusting screw is for the purpose of enabling any wear in the
brake block A being taken up.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1st. In potato digging machines the employment of a brake block A acting on
the inside periphery of one of the wheels through the medium of the lever C, cross
lever E, and elevating lever F, all substantially as and for the purposes hereinbefore
described and shown in the accompanying drawings.
2nd. In potato digging machines the arrangement and combination of the
various parts whereby the depressing of the elevating lever F causes the machine
to be put in or out of gear, regulates the depth of work, elevates the sock and
applies the brake, all substantially in the manner as hereinbefore described and
shown in the accompanying drawings.
Dated this 22nd day of January 1891.
JOHNSONS,
115, St. Vincent Street, Glasgow, Applicant's Agents.