Improvements in Parallel vice.
Year: 1888

page_text: Improvements in Parallel vice.
I, JOSEPH PARKINSON, of Chester Street, Bradford, in the County of York, Machine
Maker, 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 invention relates to certain improvements in parallel vice, and has for its
object the provision of means whereby the nut and vice screw may be moved out of
mesh for allowing the sliding vice jaw to be moved back and forth without turning
the vice screw: aud consists in raising the said screw by levers arranged in a novel
manner; and combined with the screw, mechanism for automatically operating the
vice nut in an opposite direction to that in which the screw is moved.
In the accompanying drawings Fig. 1. represents a side elevation of a parallel vice
having some of the parts cut away. Fig. 2 an end view and the remainder detached
details.
The fast jaw of the vice is denoted by the letter A, and the loose or sliding jaw
by B, the latter having an oblong hole at C, through which the vice screw passes,
and is carried at the opposite end in the usual manner. The vice screw collar D,
works against the end face of the sliding jaw, and is enclosed by a cap E, which
also acts as a carrying plate for supporting levers arranged in the following manner.
A journal is formed in the lower portion of the said cap plate E, in which is
mounted a short shaft, having a lever F, secured thereto on one side of the said cap
plate, and a lever G secured at an angle thereto on the other side; and to the latter
is attached a yoke H, partly embracing the screw collar D, enclosed within the space
covered by cap plate E.
In the recess within the loose or sliding jaw B, I place on the screw, a sleeve J,
connecting thereto by link J, a lever K fulcrumed at L, and extending through a
slot hole cut in the shank of a half nut N a spiral spring S, being on the said shank
compressed between the underside of half nut and vice base; the half nut being kept
in its position by the lugs M. M.
On pressing the lever F, in the direction of the arrow towards the vice screw, the
short lever G raises the yoke H, and thereby the vice screw, the latter causing the

page_text: lever K to be operated on its fulcrum, and the half nut N, to move towards the base
plate, thus further compressing the spiral spring S; thereby moving the vice screw
and half nut in opposite directions, to such an extent that, the threads are clear or
unmeshed, enabling the operator to move the loose or sliding jaw as required without
turning the screw.
The connection between the sleeve J, and half nut N, may be accomplished as
shown by details Figs. 3, 4, and 5, representing a side view, end view, and plan of
an arrangement in which a lever P is mounted on each side of the sleeve-J; the
fulcrum pins or screws being supported by a lug M, and the opposite end of each
lever P, instead of one passing through a slot hole as before described, are made with
a projection P¹, extending some distance over the side of the half nut N; so that on
raising the vice screw as described, the half nut N is depressed, thereby unmeshing
the threads and liberating the sliding jaw B, to be moved as desired.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, 1 declare that what I claim is :-
The combination of the levers F, and G, with the yoke H, in the manner described.
The combination of the levers F, and G, with a sleeve J, and connecting lever or
levers with the half nut N substantially in the manner and for the purpose described.
In a parallel vice the combination of the yoke H with the vice screw, sleeve J
connections with half nut N and the operating levers F, and G substantially in the
manner and for the purpose described.