Year: 1887

page_text: Date of Application, 28th Sept., 1887
Complete Specification Left, 26th July, 1888
Complete Specification Accepted, 7th Sept., 1888
1, CHARLES WHITFIELD of Union Street Kettering in the county of Northampton,
Engineer do hereby declare the nature of this invention to be as follows :-
My improvements consist in the arrangement by which the pressure is transmitted
from the excentric to the block or buffer and the method of adjusting the latter-
I carry out the arrangement in the following manner. The excentric shaft is carried
above the table of the press in horizontal bearings in a casting or castings securely
fixed to the table by suitable means-Between the bearings the usual gearing is
placed, the excentric on the shaft being outside the bearings directly over a cylinder
bored at right angles to and in the same vertical plane as the excentric shaft
bearings-In this cylinder I place a plunger and connect it at the upper end with
the excentric by means of a link or connecting rod in a similar way to that adopted
between the crank pin and piston of a trunk engine treating the excentric as the
crank pin and the plunger as the piston.
My method of obtaining adjustment is by so making the lower end of the plunger
as to allow the pressing block or buffer to screw into it so that it may be raised or
lowered readily The press may be made with one or more excentrics and plungers,
and may be adapted to most of the uses to which excentric presses are usually put.
Dated this 27th day of September 1887.
CHAS. WHITFIELD.

page_text: I CHARLES WHITFIELD of Union Street, Kettering, in the County of Northampton,
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 an improvement in the construction of cutting or stamping
presses, the plungers of which are worked by an excentric shaft, the object being to
get, without undue wear or strain, the thrust in line with the axis of the plunger,
instead of, as heretofore, imparting an inclined side thrust to the plunger.
In the accompanying drawings
:-
Fig. 1 shews in side elevation, partly in section, a double action cutting or stamping
press, with my improvements applied thereto; and
Fig. 2 is an end view of the same.
In these Figures, A is the press frame, made in one casting, and bolted to the
table A', which is usually mounted on standards of cast iron.
At its upper end, the framing is formed with bearings, as usual, to receive a
horizontal driving shaft B, which is fitted with a pair of fast and loose band pulleys B¹,
and carries a fly wheel B², and also a spur pinion B³.-C is the ordinary horizontal
excentric shaft, also mounted in suitable bearings in the framing, and carrying
excentrics C at its opposite ends.
These excentrics connect with the rods D¹ D' of the plungers D D, and, by their
rotation, impart an oscillating motion to the rods D¹.
Keyed to the excentric shaft C, is a spur wheel C2, which gears into the pinion B³,
and transmits rotary motion from the driving shaft B to the excentrics.
As thus far explained, the press corresponds, in its general features, with those in
common use, but in order to provide for the thrust of the connecting rods in line with
the axes of the plungers, I hollow the plungers (as shown in section at Fig. 1), and
connect them with their respective rods in a similar way to that adopted in trunk
engines.
The plungers D thus connected, I cause to work in guides A³, cast with the framing,
and situate immediately below the excentrics C.-These guides I make about equal in
length to the plunger, minus their length of stroke, and thereby ensure the smooth
working of the plungers.
These trunk plungers are fitted with adjustable blocks D² for imparting pressure to
the cutters placed beneath them.-The block and its plunger having a screwed
connection, the block may be readily adjusted in height to suit the depth of cutter
used, and when adjusted, its position may be secured by the clamping screw d.
By reference to the Figures, it will be seen that the plungers come into action
alternately, and that the line of axis of the plungers would, if extended upwards,

page_text: pass through the centre of their respective excentrics, thereby ensuring a direct,
in place of a diverging thrust.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The application to excentric cutting and stamping presses, of the means above
described for ensuring the delivery of the thrust of the excentric in line with the
axis of the plunger.