IMPROVEMENTS IN MACHINERY OR APPARATUS FOR WEIGHING AND LIFTING, OR FOR WEIGHING, LIFTING,
Year: 1874

page_text: LETTERS PATENT to Samuel Wilkerson, the younger, of Bassingbourn,
in the County of Cambridge, Agricultural Engineer and Imple-
ment Maker, for the Invention of "IMPROVEMENTS IN MACHINERY OR
APPARATUS FOR WEIGHING AND LIFTING, OR FOR WEIGHING, LIFTING,
T
D
D
Scaled the 5th December 1874, and dated the 30th September 1874.
PROVISIONAL SPECIFICATION left by the said Samuel Wilkerson at
the Office of the Commissioners of Patents, with his Petition, on
the 30th September 1874.
I, SAMUEL WILKERSON, the younger, of Bassingbourn, in the County
Cambridge, Agricultural Engineer and Implement Maker, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN MACHINERY
or APPARATUS For Weighing and Lifting, or for WEIGHING, LIFTING, EMPTYING,
AND FILLING SACKS, OR SIMILAR RECEPTACLES," to be as follows:-
This Invention relates to certain improvements applicable to machinery
or apparatus for weighing and lifting, or for weighing, lifting, emptying,
and filling sacks, or similar receptacles. The principal feature of the

page_text: Invention consisting in the improved application to or combination with
the said machines of a weighing arrangement.
The following is a description of the improved combination of the
weighing arrangement with improved arrangement for otherwise effecting
simply the lifting of sacks or such like receptacles, containing corn
or other merchandise, and will equally suffice as a description of the
improved application or combination of the weighing arrangement
with the improved machinery or apparatus for raising, emptying, and
filling sacks or similar receptacles, for which Letters Patent were granted
to mẹ on the 20th day of November, A.D., 1871, No. 3137, the said
application or combination being effected in substantially the same
manner has hereafter described, in reference to the combination of the
weighing and lifting arrangements.
On a suitable bottom plate or foundation I erect two front standards
in a vertical or slightly inclined direction, and I make a groove in the
inner front face of each. In cach groove I place a side iron of a sliding
iron frame, which at its lower end projects forwards in the manner of
the prongs of a wide fork, and when in its lower position this forked
part rests upon the said bottom or foundation plate. The upper ends
of these side irons I connect by a curved or straight cross bar, and to
their lower ends otherwise I connect a chain or chains, the other
ends of which I attach to excentric heaving pulleys carried by the front
standards at their rear, placing the excentrics in such a manner as to
enable a man at those portions of the stroke or revolutions of the
handle of the shaft, where he has the greatest power to exert it more
effectively in the lifting of the sacks. In this case I carry the chain
from the excentric heaving pulleys over other pullies carried by brackets
at or near the top of the standards to the lower ends of the said side
irons; or I attach the chains in the ordinary way to the heaving pullies
without passing them over the top pulleys.
Each of the above-mentioned forked parts is provided on its upper
surface with two or more conical projections.
In front of and immediately above the lifting frame or sliding iron
I place the weighing frame, which consists of a back for supporting the
sack, and of a frontward projecting base which is also provided with
conical projections.
At the time of weighing the sack and contents, the sack is placed
upon a board provided in its under surface with conical holes, the inner

page_text: ones of which rest upon the conical projections of the weighing frame,
so that the board and sack are thereby supported during the weighing,
after which upon the operation of the winch actuating the excentric
heaving blocks the sliding frame is actuated, and rises, and its conical
projections catch the outer conical holes of the projecting edges of the
board or platform and raises it with the sack from the weighing frame.
The under surface of the weighing frame rests or is centred upon a
pivot carried by the front end of a weighing lever which is centred to
the framing so that any weight placed upon the board causes the front
end of the weighing lever to be depressed and consequently causes
its other or graduated end to be elevated. This end is suitably graduated
and is provided with a sliding pound weight; the heavier weighing is
obtained by the use of movable weights placed on or near the outer end of
the weighing lever. Or in lieu of this weighing lever I can. use a weighing
beam and rest the weighing frame upon its forward end, and pivot it at or
near its centre, and place the weights upon the other end.
The front standards are secured to the foundation plate by cross and
rear framings of wood or iron, the rearmost of which carries an
adjustable arrangement used to adjust a steadying bar which bears.
against the back of the weighing frame, and is used to regulate it. The
centre of the above-mentioned cross bar carries a hook which is turned
backwards when the sack and contents are being weighed and turned
forwards so as to hold the sack when it is being raised.
The back of the weighing frame at its front carries a detachable sack
holding device for holding open the mouths of sacks, so that they may
be held open till they are filled up to any desired height or weight; this
device is substantially of similar construction to that described in my
above referred to Letters Patent.
The parts of the above described weighing arrangement can all be
removed when required for transport or when the machine or apparatus
are required to be used simply for lifting, or for lifting, emptying,
and filling sacks without weighing.