Improvements in or relating to Presses suitable for Pressing Linoleum and similar Material.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Presses suitable for Pressing
Linoleum and similar Material.
I, CHARLES HERBERT SCOTT, of High Orchard Iron Works, Gloucester, in the
County of Gloucester, Engineer, do hereby declare the nature of this invention to
be as follows:
This invention has reference to a construction of press suitable for pressing
linoleum and similar material whereby a more rapid action and also a more
definite stroke of the press can be obtained than has heretofore been usual and
whereby the movable press head and consequently the pressure on the material
under treatment can be caused to "dwell" for a short time between each
operative stroke of the pump ram used for operating such head.
According thereto the press head is carried by a hydraulic ram fitted to rise
and fall in a cylinder that is charged with liquid and is in direct connection
with one end of a pump barrel or cylinder that is provided at its other end with a
stuffing box or gland through which works a pump ram or plunger arranged to
be reciprocated by a crank, eccentric or other suitable operating means, the
arrangement being such that inward and outward movement of the pump ram
would per se produce upward and downward movement respectively of the
hydraulic ram of the press. In connection with the press cylinder there is
provided a small auxiliary pump arranged to deliver into the cylinder on the
outward stroke of the main pump ram, and also a safety valve. Between the
press plates or heads there are provided, as usual, suitable stops to limit the move-
ment of the movable press head towards the fixed press head in order to
subject the material under treatment to a definite pressure. The arrangement
is such that in the working of the press, the movable press head will be moved
upward by the action of the main pump to a definite extent limited by the stops,
the safety valve opening to permit of the escape of excess of liquid from the
hydraulic cylinder whilst at the same time maintaining the pressure on the
material under treatment, and upon or just before the main pump ram com-
mences to make its return stroke the auxiliary pump will commence to deliver
liquid into the press cylinder so as to cause the movable press head to dwell and
maintain the pressure on the material under treatment during any desired portion
of the backward movement of the main pump ram, excess of liquid supplied by
the auxiliary pump escaping past the safety valve.
The auxiliary pump is or may be so constructed that its stroke or capacity
or the moment when it comes into and goes out of effective action, can be
altered so that the quantity of liquid supplied by it to the press cylinder and
the time during which it acts and consequently the duration of the "dwell" of
the movable press head on the pressed material can be altered at will. The
'take
auxiliary pump also serves to make good any leakage of liquid that may

page_text: place past the leather packings of the hydraulic ram, or the stuffing box or
gland of the main pump.
By reason of the absence of valves in the press and to the driving of the pump
plunger by means of a continuously running crank which produces a regular
acceleration and retardation of the motion of the plunger, the press can be
run faster than usual.
Improvements in or relating to Presses suitable for Pressing
Linoleum and similar Material.
I, CHARLES HERBERT SCOTT, of High Orchard Iron Works, Gloucester, in the
County of Gloucester, 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:-
_
This invention has reference to a construction of press suitable for pressing
linoleum and similar material whereby a more rapid action and also a more
definite stroke of the press can be obtained than has heretofore been usual
and whereby the movable press head, and consequently the pressure on the
material under treatment, can be caused to "dwell" for a short time between
each operative stroke of the pump ram used for operating such head, as I shall
now describe with reference to the accompanying illustrative drawings wherein
Fig. 1 is a cross section; Fig. 2 a side elevation; Fig. 3 a plan view; and Fig. 4
a part longitudinal section showing a press constructed according to this
invention.
a is the movable press head carried by a hydraulic ram b fitted to rise and
fall in a cylinder & that is charged with liquid and is in free and direct connec-
tion with one end of a pump barrel or cylinder e that is provided at its other end
with a stuffing box and gland through which works a pump ram or plunger g
arranged to be reciprocated by a crank, eccentric or other suitable operating
means, the arrangement being such that inward and outward movement of the
pump ram or plunger g would per se produce upward and downward movement
respectively of the hydraulic ram and press head a. In connection with the
press cylinder there is provided a small auxiliary pump h arranged to deliver
into the cylinder d on the outward stroke of the main pump plunger g, and also a
loaded safety or escape valve i. In the construction shown, the main pump
plunger g is reciprocated from a crank k through a connecting rod 1, and the ram
of the auxiliary pump is reciprocated by a rod m from a crank pin » arranged
opposite to the crank k. The safety valve i, loaded by a weighted lever o, is
arranged in the pipe connection p between the auxiliary pump h and the press
cylinder d.
Between the movable press head a and the fixed press head there are pro-
vided, as usual, suitable stops to limit the movement of the movable press head
towards the fixed press head in order to subject the material under treatment
to a definite pressure.

page_text: The linoleum or other material to be treated is fed automatically and inter-
mittently by suitable means between the press heads a and q at a suitable rate,
say two to six inches per stroke of press. In the example shown a band s, which
is suitably operated in an intermittent manner, is arranged to carry and feed
the material to be treated between the press heads which may be hollow and
steam heated as usual, according to circumstances, an endless band t serving to pre-
vent direct contact of the said material with the fixed press head q. In the example
shown, the bands is moved by a card roll u provided with a ratchet wheel w
(Fig. 1) that is worked automatically and intermittently by a pawl w and lever
from a crank pin y (Fig. 3) on one of the bevel wheels z.
In the working of the press, the movable press head a will be moved upward
by the inward motion of the main pump plunger g to a definite extent limited
by the stops r, the safety valve i opening to permit of the escape of excess of
liquid from the hydraulic cylinder b whilst at the same time maintaining the
pressure on the material under treatment between the two press heads constant,
and upon or just before the main pump plunger g commences to make its return
stroke, the auxiliary pump h will commence to deliver liquid into the press cylin-
der d so as to cause the movable press head a to "dwell," i.e., to remain at rest, and
maintain the pressure on the material under treatment during any desired
portion of the backward movement of the main pump plunger, excess of liquid
supplied by the auxiliary pump escaping past the safety valve i.
The auxiliary pump is or may be so constructed that its stroke or capacity
can be altered, so that the quantity of liquid supplied by it to the press cylinder d
and the time during which it acts, and consequently the duration of the "dwell"
of the movable press head on the pressed material, can be altered at will. The
said auxiliary pump also serves to make good any leakage of liquid that may
take place past the leather packings of the hydraulic ram b, or the stuffing box
|and gland f of the main pump.
By reason of the absence of valves in the press and of the driving of the
main pump plunger by means of a continuously running crank k which pro-
duces a regular acceleration and retardation of the motion of the plunger g
the press can be run faster than usual, so that pressure can be applied to and
removed from the material under treatment in rapid succession, say at the rate
of 20 to 30 times per minute, whereby the material can be consolidated and
finished in a better and quicker manner than is the case where the material
is subjected to a steady pressure for about one minute for each charge of material,
as heretofore usual. For the purpose of effecting the compression of the
material in a gradual manner until the necessary consolidation is effected,
the adjacent faces of the press head a and q may, for about one third of their
width, be slightly inclined towards each other from the inlet side.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed; I declare that what
I claim is:-
-
1. A press suitable for pressing linoleum and similar material wherein the
movable press-head is carried by a hydraulic ram the cylinder of which
is in direct and free connection with a main pump barrel or cylinder
having a reciprocating plunger and there is provided in connection
with such ranr cylinder an auxiliary pump arranged to deliver
liquid into the cylinder on the outward stroke of the main pump plunger and
a safety valve, the arrangement being such that pressure can be applied and
removed from the material under treatment in rapid succession, that the movable
press head and consequently the pressure on the said material can be caused to
dwell" during a portion of each outward stroke of the main pump plunger,
and that excess of liquid supplied by the auxiliary pump can escape from the
hydraulic cylinder on each inward stroke of the said plunger, substantially as
described.

page_text: 2. A press for pressing linoleum and similar material, constructed arranged
and operating substantially as hereinbefore described with reference to the
accompanying drawings.
April 1900.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.