An Improvement in Crank, Eccentric, or Cam Presses.
Year: 1890

page_text: Date of Application, 1st Aug., 1890
Complete Specification Left, 24th Apr., 1891-Accepted. 30th May, 1891
PROVISIONAL SPECIFICATION.
An Improvement in Crank, Eccentric, or Cam Presses.
I, FREDERICK WILLIAM DURHAM of Clevedon Villa, Station Road, New
Barnet in the County of Hertford, Engineer do hereby declare the nature of
this invention to be as follows:-
My invention relates to presses of the kind which have their followers moved up
and down, or to and fro by cranks eccentrics or cams. In those presses when it is
desired to stop or start the the follower, a clutch is moved connecting the driving
shaft with the crank, eccentric or cam shaft, and as the driving shaft is always
revolving at speed, there is often a serious shock occasioned by the engagement
and disengagement of the clutch.
The object of my invention is to avoid these shocks and to facilitate the starting
and stopping of the follower which I effect in the following manner. I divide into
two parts the sliding rod or bar by which the movement is conveyed to the follower
from the crank cam or eccentric, the one part being fitted to slide along the other
throughout the whole length of the stroke, while the follower remains at rest; and
I provide a catch by which the one part can at will be rigidly connected to the
other part, so that they move together as one piece thus working the follower.
As at each return of stroke or dead centre there is comparatively slow movement
of the part worked from the shaft, the catch can at these moments be easily moved
so as to engage the follower with the moving part or to disengage it.
Dated this 1st day of August 1890.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Crank, Eccentric, or Cam Presses.
I, FREDERICK WILLIAM DURHAM of Clevedon Villa, Station Road, New
Barnet, in the County of Hertford, 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 :—
My invention relates to presses of the kind which have their followers moved up
and down, or to and fro by cranks, eccentrics or cams.
In those presses, when it is desired to stop or start the follower, a clutch is moved
connecting the driving shaft with the crank, eccentric or cam shaft, and, as the
driving shaft is always revolving at speed, there is often a serious shock occasioned
by the engagement and disengagement of the clutch.
The object of my invention is to avoid these shocks, and to facilitate the starting
and stopping of the follower which I effect in the following manner. 1 divide into
two parts the sliding rod or bar by which the movement is conveyed to the follower
from the crank cam or eccentric, the one part being fitted to slide along the other
throughout the whole length of the stroke, while the follower remains at rest; and
I provide a catch by which the one part can at will be rigidly connected to the
other part, so that they move together as one piece thus working the follower.
As, at each return of stroke or dead centre, there is comparatively slow movement
of the part worked from the shaft, the catch can at these moments be easily moved
so as to engage the follower with the moving part or to disengage it.

page_text: and
Fig. 1 of the accompanying drawings is a vertical section partly in elevation
Fig. 2 is a horizontal section on ✗ of a crank-moved press provided with dis-
engaging gear according to my invention. }
The crank C, continuously rotating, gives reciprocating motion to a slide A,
which is independent of but fitted to slide in, guides of the follower B, and has a
piece D projecting down from it. On the follower B is pivotted a bell crank
lever E Fthe arm F urged upwards by a spring. On the frame of the press is
pivotted another bell crank lever GH, the arm H being urged upwards by a
spring against a stop and being linked by a rod K and sleeve L to a treadle, or
it might be to a handle, in any convenient position.. On the sleeve L is pivotted a
spring trigger M the nose of which catches against a collar on the rod K. The
arm G when in the position shewn holds down the arm F and so keeps the arm E
disengaged from the piece D. In this condition of the parts, the slide A goes on
reciprocating without moving down the follower B, which is held up against a
suitable stop by a counterweight or spring. When it is desired to move down the
follower B, the treadle or handle is moved so as to depress the sleeve L rod K and
arm H thereby withdrawing the arm G from above F, whereupon F springs up
causing the arm E to come immediately under D. The descent of the slide A
then causes the follower B to descend during one stroke. But the descent of L by
moving the trigger M over a fixed stop N disengages the nose of the trigger from
the shoulder of K allowing K to spring up and the arm G to return to its position
over F, so that, as the follower B ascends, the arm F being stopped by G causes
the arm E to be disengaged from D, and, although A goes on reciprocating, B does
not make another stroke until the treadle or handle, and sleeve L having been
raised by a counter weight or spring so as to reengage the trigger M with the
shoulder of K, are again depressed, so as to remove G from over F.
laving now particularly described and ascertained the nature of this inven-
con and in what manner the same is to be performed, I claim :-
In a crank, eccentric or cam press separating the sliding follower from a slide
continuously reciprocating and providing a spring catch by which the follower can
be engaged at will to make its stroke with the slide, substantially as and for the
purposes set forth.
Dated this 23rd day of April 1891.
ABEL & IMRAY,
Agents for the Applicant.