Improvements in Mounting the Gripping Screw of Parallel Vice.
Year: 1890

page_text: Date of Application, 8th May, 1890
Complete Specification Left, 9th Feb., 1891-Accepted, 14th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Mounting the Gripping Screw of Parallel Vice.
I, FREDERICK THOMAS SCHMIDT, of 9, Clarendon Street, Bradford, in the
County of York, Electrical Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
This invention relates to certain improvements in that class of parallel vice in
which the loose or movable jaw may be moved rapidly towards or from the fixed
jaw without having to turn the vice screw, and has for its object, the mounting of
the vice screw in such a manner that, when the loose jaw is being tightened to grip
anything between the jaws, the screw is more effectually retained in contact with
the threads of the half nut fixed to the bed plate of the fast jaw than when mounted
in the usual manner.
I accomplish my object in the following manner :-The gripping screw is mounted
in the loose jaw of the vice by passing it through a slot cut in the front end of the
vice slide, the opposite end is supported by a hole bored in the back of the box
forming part of the loose jaw slide, and when in its normal position, the screw is
supported by the half nut secured to the bed plate of the vice.
Upon the vice screw at the lever end of the same and against the nipping collar,
is placed a loose collar having flat sides for some portion of its length, which engage
with the before mentioned slot hole and allow the screw to rotate without rotating
the collar, or in lieu of a collar having flat sides, projections may be formed on one
side of a collar, one of which permanently engages with a recess and the other
projections with recesses when the jaws are gripping.
After adjusting the loose jaw and on turning the screw to grip the jaws together,
the flat sided collar is moved into such position that, it engages with one or more
projections, thereby retaining the screw threads in contact with the threads of the
half nut; or when a collar having projections thereon is utilized, one or more of
the projections engage with recesses cut in the loose jaw and retain the screw in its
requisite position.
JOHN WAUGH,
Agent.
COMPLETE SPECIFICATION.
Improvements in Mounting the Gripping Screw of Parallel Vice.
I, FREDERICK THOMAS SCHMIDT, of 9, Clarendon Street, Bradford, in the
County of York, Electrical Engineer, do hereby declare the nature of this inven
tion, and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
This invention relates to certain improvements in that class of parallel vice in
which the loose or movable jaw may be operated rapidly towards or away from the
fixed jaw without having to turn the vice screw, and has for its object, the mounting
of the vice screw in such a manner that, when the loose jaw is being tightened to
grip anything between the jaws, the screw is effectually retained in contact with the
threads of the half nut fixed to the bed plate of the fast jaw.
In the accompanying drawings
Fig. 1 represents a side view of a parallel vice made according to my invention,

page_text: HNUTIE RO CVIKALT
that shown by Figs. 3 and 4.
Fig. 7 is a view of a portion of a loose or sliding jaw partly in section, and with
the screw arranged to engage with a recess cut in the loose jaw without the aid of
a loose collar and
Fig. 8 is an end view of the loose jaw showing the circular recess for the screw
collar.
In all the views similar letters indicate like parts.
The gripping screw A. is mounted in the box B. of loose jaw C. of the vice by
passing through the slot D. cut in the front end of the box B. the opposite end of
the scrow A being supported by passing through a hole bored in the hack end of
said box B. and when the screw A is in its normal position, the lever end at A' is
supported by the sectional nut E. secured to the bed plate F of the fast jaw Cof
the vice; the compressed spiral spring ( placed around the unthreaded part of the
serew spindle A. forces the screw back until the nuts W are in contact with the end
of loose jaw box, and the loose collar II away from the front end of said box B
at B as shown by Fig. 1.
The loose collar is retained in its position on the serow spindle A. by a small
serew passing through the collar with the end engaging in a groove K cut in the
spindle, so that by the flat sides 11' of the loose collar engaging with the sides of
the slot hole D. the screw A. may be rotated without rotating the collar; or in
lien of a collar having flat sides as described, a projection L may be formed on
one side of a collar as shown by Figs. 5 and 6 which permanently engages with the
before mentioned slot D. the collar retaining its position on the screw spindle by a
small screw J engaging with a groove K in the manner as before described.
When the screw spindle A is fitted with either arrangement of loose collar, on
raising the screw by the lever end at A clear of the sectional nut E. the loose
jaw may be moved towards or away from the fast jaw (" to suit the thickness of
the material to be gripped, without rotating the screw which, on being lowered,
engages with the sectional nut and is partly held thereon by the spring M. pressing
on same. On turning the lever at end the screw travels some distance in the
direction of the arrow, compressing the spiral spring (and moving loose collar H
until in contact with the end of vice box at B, and the projections N thereon
engage with the recesses P cut in the front end of vice box by which operation the
material is gripped between the jaws and the screw A. retained in connection with
the nut E.
According to my modified arrangement of recess shown by Figs. 7 and 8, the ond
of the screw A. is provided with a spiral spring (i. applied in the same manner as
is shown by Fig. 1, but there is no loose collar E. on the screw at the opposite end.
In this case a circular recess at R. is cut in the end of loose jaw box at B' and on
turning the screw A. it travels in the direction of the arrow as before described,
until the collar S. of screw spindle anters the recess R. when the loose jaw is
operated sufficiently to grip the material; the recess R preventing the screw A
rising clear of the nut. E in the same manner as before described.
Having now particularly described and ascertained the nature of my said invon-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :-

page_text: collar H having projections N thereon for engaging with recesses P for the purpose
as hereinbefore set forth.
2. In a parallel vice the screw A combined with a spiral spring G and a circular
collar S for engaging with the circular recess R for the purpose as hereinbefore set
forth.
PA "
JOHN WAUGH,
Agent.