IMPROVEMENTS IN PARALLEL VICES
Year: 1876

page_text: LETTERS PATENT to Robert Renton, of the Firm of Askham, Brothers, and
Renton, Yorkshire Steel File and Anvil Works, Sheffield, in the County of
York, for the Invention of "IMPROVEMENTS IN PARALLEL VICES."
Sealed the 8th June 1877, and dated the 12th December 1876.
PROVISIONAL SPECIFICATION left by the said Robert Renton at the Office
of the Commissioners of Patents on the 12th December 1870.
ROBERT RENTON, of the Firm of Askham, Brothers, and Renton, Yorkshire Steel
File and Anvil Works, Sheffield, in the County of York. "IMPROVEMENTS IN
PARALLEL VICES."
My said Invention relates to improvements in parallel vices, and consists in the
novel construction and combination of the parts of the vice as herein-after specified;
that is to say, I form in the bed of the vice a dovetail groove and form the jaws with
dovetail projections which slide freely in the said groove. By this construction the
cost of manufacture of these vices is diminished while their strength is increased;
the vice is caused to work very easily, and will not be liable to derangement. I cut
a groove in the screw pin near the collar and pass a set screw through the eye of
the vice into the said groove to keep the said pin in place, and I use only one
washer instead of two washers; that is to say, I place a washer on the screw pin
inside the eye of the vice, to hold the said pin in adjusting the vice or setting it in
or out. This manner of constructing the parts of the vice also reduces the cost of
its manufacture.
Heretofore it has been usual in the manufacture of these vices to form the eyes of
the jaws by heating and punching them, but according to my Invention I drill and
slot the said eyes, thereby avoiding any weakening of these parts of the vice,
cheapening its manufacture, and improving the appearance of the vice.

page_text: cheapening their manufacture, and improving the appearance of the vice.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation of a vice constructed according to my Invention;
Figure 2 is a back view of the saino. Similar letters indicate the same parts in
both of these Figures.
A is the bed of the said vice with a dovetail groove therein; B is the back jaw,
and C is the front jaw of the said vice; B₁ is a dovetail projection on the back
jaw B, which projection fits and slides in the said groove in the bed; the front
jaw C is permanently fixed or formed on the bed; D, D, are the eyes in the jaws;
E is a bush; F is a cotter; C is a groove cut in the screw H. The eyes D are
drilled or bored to fit the screw H and tube H', as above set forth, instead of being
punched out for this purpose, as heretofore.
The cotter F passes through the bottom of the eye in the jaw C, and fits within
the groove G in the screw E, nnd holds the said screw securely in the said jaw. I
may use the bush E or dispense with the saine, as may be found most advantageous
or convenient.
Having thus fully described my said Invention, and shown how the same may be
conveniently and advantageously carried into practise, I claim,-
First. In a parallel vice the combination of the dovetail groove in the bed and
the projection on the jaw fitting and working in the said groove, as above set forth
and for the purpose specified.
Second. In a parallel vice the back jaw provided with a projection sliding in
a dovetail groove in the bed in combination with a fixed front jaw, as above
described.
Third. In a parallel vice the combination of the groove in the screw or screw pin
with the cotter or key, as above set forth and for the purpose specified.
Fourth. In the manufacture of the said vices the formation of the eyes in the
jaws by drilling or boring, as above set forth and for the purpose specified.
In witness whereof, I, the said Robert Renton, have hereunto set my hand and
seal, this Ninth day of June, in the year of our Lord One thousand eight
hundred and seventy-seven.