Improvements in Screw Presses, Bench Cramps or Holdfasts, and other Oramps.
Year: 1894

page_text: Date of Application, 12th Jan., 1894-Accepted, 24th Mar., 1894
COMPLETE SPECIFICATION.
Improvements in Screw Presses, Bench Cramps or Holdfasts, and
other Oramps.
I, SAMUEL SIDNEY BROMHEAD of 97 Newgate Street, London, Patent Agent,
(a communication from Alfred Liron of 45 Rue Segmer, Nimes, France, Builder),
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 new system of press and screw-down appliances consists of three chief parts,
namely, (1) a horizontal shoe or foot (2) an arched standard or stem and (3) a head
with a pressure screw, mounted on an adjustable horizontal arm.
I will now describe the invention with reference to the accompanying drawings
in which
Fig. 1 shows an elevation of all three parts, the head M and its arm being in
section. The thumb screw o, engages with the recesses o', and keeps the head M in
position at any required distance.
The blocks z placed between A, and M, are undergoing gradual compression
through the nut a, from the left handed screw h, which is solid with the right hand
screw. By reason of this double handed screw f, h, great rapidity of movement
is obtained.
The nut a, cannot turn in the aperture g, being prevented by the spur d, and is
therefore compelled to slide up or down vertically in the groove o, provided for it.
is a small space available for lubricating purposes.
e,
Fig. 2 shows a sectional elevation of a somewhat different form of the head, in
which the screw has only a single left hand thread f, connected to the top of which
is the lever f¹, by means of the crosspin k.
In this form of head the screw f, has a screwed collar f". In this figure as in
Fig. 1 the nut a cannot entirely leave the space g being arrested at the end of its
groove by the spur d.
Fig. 3 shows a sectional elevation of a simpler form of head, in which the
screw has a thumbpiece at top, and terminates in a pivotted horizontal plate q,
furnished with teeth on its lower surface. These teeth engage with the wood or
other material to be compressed, and prevent the plate from turning.
Fig. 4, shows a section of another modification in which the screw f carries at
its lower end a knob & which engages with a stud d, and thus raises or depresses
the travelling nut a, which is fitted with a shoe shaped base.
記
Fig. 5, shows a section of a press head which is very similar to that shown in
Fig. 4, but with this difference that the screw operates the travelling out a by
means of a reverse thread at its lower end as in Fig. 1.
In the last two examples the travelling nut a and the recess in which it slides
are formed with several faces to prevent its turning with the screw.
Fig. 6, shows a head in section, which is operated by an excentric L working on
a centre pin l. The head is formed with the two cheeks m m, one of which is
attached to the lever F. In this instance the arm M can be fixed to a standard E
of the required height, or can be made adjustable as in Figs. 1 and 3.
Having now fully described and ascertained the nature of my said invention,
and in what manner the same is to be performed, I declare that what I
claim is ;
1. A screw press or cramp consisting of the combination of a notched standard
or support at the lower end of which is a baseplate or foot, and at the upper end

page_text: an adjustable arm carrying a head in which is a pressure screw operating a travelling
nut or plate, as herein described and set forth.
2. The modified form of press or cramp shewn in Fig. 6.
Dated this 12th day of January 1894.