Improvements in Hand Presses for Pressing Bricks, Tiles, and other like Articles.
Year: 1893

page_text: Date of Application, 23rd Feb., 1893-Accepted, 21st Oct., 1893
COMPLETE SPECIFICATION.
Improvements in Hand Presses for Pressing Bricks, Tiles, and other
like Articles.
I, RICHARD HENRY ROBINSON of The Albert Works, Preston, in the County
of Lancaster, Engineer and Ironfounder, do hereby declare the nature of this inven-
tion 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 hand lever presses of the vertical type in which the
brick tile or other article is compressed between a simultaneously descending cross-
head and an ascending push plate. In such machines the crosshead is mounted
upon the upper ends of a pair of rods supported in bearings on opposite sides of
the apparatus which at their lower ends are attached to the two extremities of a
crank shaft capable of a rotary and also of an up and down sliding movement in
vertical guide bearings. The crank on the shaft is placed centrally of the apparatus
and upon its cross più rests the underside of a heel formed upon the lower part of
a vertical sliding bar which supports on its upper extremity the push plate. On
one side of the apparatus is a hand lever keyed upon the crank shaft and this lever
is continued on the other side of the shaft in the form of a curved heel or finger
which rests upon a bowl mounted on a fixed stud. On the opposite end of the
crank shaft is a weighted lever which normally is arranged to bear on the crank
shaft so as to effect the opening out or distending of the crosshead and push plate
away from each other. The said weighted lever has a curved heel or finger resting
upon a bowl similarly to the hand lever. When the hand lever and the crank
shaft are so moved round as to draw the crosshead and the push plate towards cach
other the weighted lever is gradually pulled round over its vertical centre line and
its weight being then on the same side as the power influencing the hand lever
an additional pressure or power for forcing the crosshead and push plate together
is afforded.
In machines of the kind referred to as heretofore constructed it has been the
practice when altering the apparatus to suit varying thicknesses of the articles to
be compressed to raise or lower the initial position of the push plate by means of
packing pieces of the required thickness being introduced below or above the push
plate and it will be obvious that by such an arrangement when the position of the
push plate is so heightened as to be suitable for pressing articles of a certain degree
of thinness the movement of the hand lever causes the raised push plate to reach
its destination that is to say to meet and compress the article being operated upon
before the usual weighted lever is pulled over far enough to reach the vertical
central line of its fulcrum the pressure to be exerted being therefore entirely
dependent upon the hand lever and in some cases having to overcome the resistance
of the weighted lever itself.
or
In carrying out my invention I make the weighted end of the weight lever
adjustable in such manner that the weighted part may be caused to pass beyond
over the vertical central line of its fulcrum sooner or later according to the
thickness of the article to be compressed between the push plate below and the
crosshead above.
I also make the cross-head adjustable vertically by mounting it on screw-
threaded side rods and by securing it thereto by means of upper and lower
regulating nuts.
In order that my invention may be better understood I append a sheet of
drawings in which,
Fig. 1 is a front view of a weighted lever having my improvements applied
thereto and
..
the came

page_text: Figs. 3 and 4 illustrate the altered position of parts (hereinafter described).
In the said figs. a indicates the position of the fulcrum (which in practice is the
ordinary cross shaft carrying at one end the hand lever and at the other the
weighted lever) and its vertical central line. c is a weight adjustable on the upper
part of the weighted lever d. The lever d is formed in two separate parts which
are joined or fastened together by means of the two discs or plates e e and a screw
bolt and nit g. The plates e e having corresponding teeth on their adjoining faces
constitute a clutch device the said plates having a central hole through which the
screw bolt g passes (see Fig. 5). The teeth on the inner faces of the plates ee are
preferably of as fine a pitch as practicable so that they may be adjusted relatively
to each other with the greater nicety. By loosening the nut on the bolt y the two
plates ee may be withdrawn or disengaged from each other and the upper part of
the lever may be moved or adjusted relatively to, the lower part to any desired
position (as illustrated at Figs. 3 and 4). The plates ee may conveniently be cast
in one piece with arms or plate brackets and fastened by screw bolts and nuts
(as shewn at Figs. I to 4) to the upper and lower parts of the lever d which are
preferably of wrought iron.
Fig. 5 shews (drawn to a larger scale) one of the plate castings detached.
Fig. 6 illustrates my improved mode of making the height of the crosshead
adjustable. jis the crosshead k k the screw-threaded side rods, and the upper
and lower regulating nuts.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In hand lever presses of the kind hereinbefore referred to the use or
employment in conjunction with the weighted lever of a clutch device constructed
and arranged substantially as described and shewn in the drawings for the purpose
set forth.
2. In hand lever presses of the kind hereinbefore referred to the use or employ-
ment in conjunction with the cross-head of screw-threaded side rods and upper and
lower regulating nuts substantially as described and shewn in the drawings for the
purpose set forth.
Dated this 3rd day of Wahr 1902
W. LLOYD WISE,
Per W. Cross,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.