An Improvement in Parallel Vices.
Year: 1896

page_text: Date of Application, 29th Jan., 1896
Complete Specification Left, 20th Oct., 1896-Accepted, 21st Nov., 1896
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PROVISIONAL SPECIFICATION.
An Improvement in Parallel Vices.
SAMUEL HARRISON, of Kirkgate, Ripon, Yorks, Surveyor, do hereby declare
the nature of this invention to be as follows:-
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To secure a firmer grip with the jaws without sacrificing the speed in opening
and closing the jaws, and is thus secured; on the main screw A is placed a
sleeve, D, the said sleeve having a feather E at one end fitting in movable jaw G,
the remainder of outside of sleeve being screwed on which screwed part the
screwed nut B fits; the washer C and the collar F keep the main screw, sleeve,
snut and movable jaw together; for a firm grip the nut B is revolved; for a quick
motion the main screw A is revolved.
Dated this 28th day of January 1896
I, SAMUEL HARRISON, of Kirkgate, Ripon, in the County of York, Surveyor,
do hereby declare the nature of this invention and in what mauner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
This invention has reference to improvements in parallel quick-acting vices,
so as to secure a firmer grip without sacrificing speed in opening or closing
the jaws.
The ordinary quick-acting vices used in fitting shops are not found suitable
for holding articles which require large pieces to be cut off them by the act of
shipping, the vibration from this operation being sufficient to slacken back the
quick pitched screw or cam in its nut, thus causing failure to hold the work
securely.
In order to quicken the speed of the movable jaw, I make the main screw of
quick pitch and I fit at its end a short handle instead of the longer one usually
fitted, the said short handle being found to provide sufficient leverage for holding
articles for filing or scraping. The novel feature of my invention, however,
consists in fitting the main screw with a sleeve, for operations requiring greater
holding power than is obtained by the ordinary vice, the said sleeve being
prevented from rotation in the sliding jaw by means of a feather; the remainder
of the outside of this sleeve is cut with a screw thread of finer pitch than the
main screw, and a screwed nut provided with a handle enables the sliding jaw to
be closed or opened over a short distance, the action of moving the said handle
acting as a kind of locking nut or double security for keeping the movable jaw in
a fixed position.
A slight depression of the handle and screwed nut is all that is requisite for
securely fixing the work in the vice.
My invention may be applied to vices of various kinds.

page_text: In order that my invention may be better understood and more readily carried
into effect I will describe it with reference to the accompanying drawing.
The drawing illustrates a longitudinal section through the centre of a parallel
vice illustrating its application for a fitting bench.
In the figure, a is the fixed or permanent jaw, b is the movable jaw sliding
through the barrel a¹ of the fixed jaw, c is the short handle; d is the spindle the
end a being cut with a quick pitch screw thread, the part working loose
through the sleeve e. f is a screwed collar. The end of the screwed sleeve e at
the outside is of finer pitch than the main screw d; g is a nut, terminating in the
handle g', working round the screwed sleeve e. is a feather the head being in a
recess cut in the movable jaw b to prevent the screwed sleeve e from rotating.
jis a collar compelling the jaw b, sleeve e and nut g to move forward together
when the handle c is rotated. I is a washer securing the nut g to the sliding jaw b.
The loose jaw b is maintained in its correct position with reference to jaw,a by
cutting a key-way in the barrel a' and fixing a key k to the frame so that it slides
in the key-way cut in the movable jaw.
Briefly the working of my invention is as follows:-The drawing shows the
jaws closed. For the purpose of opening them the handle c is rotated and the
movable jaw b and the parts connected therewith, that is, the nut g, handle gl, and
sleeve e, move away from the fixed jaw a. When an article is placed between the
jaws and it is required to get the extra gripping power, the handle g of the nut g
is slightly revolved working round the screwed sleeve e and forcing the loose jaw
tighter to the fixed jaw a.
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 :-
In a vice, a gripping nut terminating in a handle, for the purpose of obtaining
extra force and more securely fixing the jaws together, substantially as herein
described and as illustrated in the accompanying drawings.
Dated this 20th day of October 1896.
JOHN P. O'DONNELL, Fel. Chart. Inst. P.A.,
70 & 71 Palace Chambers, Westminster, S. W.,
Agent for the said Applicant.