Improvements in Screw-vices.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Screw-vices.
I, JOSEF LEINEN, of Esslingen in the Kingdom of Wurttemberg and German
Empire, do hereby declare the nature of my invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
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My invention relates to parallel screw vices, and its object is, to provide a vice of
such construction that when the same is opened to its full extent, the moveable or
sliding jaw or gripper shall be supported in its slides with equal stability as when
in any other, more nearly closed position, and further to so arrange the screw
spindle of the vice, that it shall be always completely encased-and entirely inaccessible
to dirt, dust, filings etc., whether the jaws or grippers be opened or closed.
I attain these objects by the device hereinafter described and illustrated in the
accompanying drawings which form part of this Specification and in which
Fig. 1 is a sectional elevation of my improved vice and
Fig. 2 a back elevation.
Similar letters denote similar parts through the several views.
In this vice the front jaw or gripper A is fixed and cast in one solid piece
together with the guides for the back moveable jaw, and flanges for attachment to
the bench.
The back moveable jaw B, slides in the plate A and is provided with a screw
spindle C, fixed in its back end and projecting forwards towards jaw A, in a hori-
zontal position. This screw spindle is prevented from revolving in jaw B by a set
screw or any other suitable and practical device.
A key D, consisting of the tubular piece D', having at its end the internal screw
thread D which fits spindle C, is mounted and revoluble in the piece A, but may
not be horizontally displaced owing to its collar E for the reception of which the front
end of jaw A is turned out and provided with a plate F which holds the key
horizontally in position, at the same time allowing it to be revolved.
The vice operates in the following manner: if the key D be turned round to the
left, the same being horizontally immoveable, will force the spindle C backwards
and with it the moveable jaw B thus opening the vice on turning the key D in
the other direction the two jaws or grippers will be drawn together and the vico closed.
In any position of the two jaws A and B the screw spindle is entirely encased,
and inaccessible to dirt, filings, etc.; for instance when the jaws are opened, the
spindle is enclosed partly in the tubular part D' of the key D and partly by the
construction of the jaw B; on the other hand if closed the same is entirely encased
in tube D.
Having now particularly described and ascertained the nature of my said invention
and the manner of operation of the same, what I claim and desire to secure by
Letters Patent is :
In screw vices a fixed jaw A having slides for the moveable jaw and arrangement for
attachment to the bench and having mounted therein in the manner specified, a key D,
having the tubular part D provided with the internal screw thread D² at its end, in
combination with a moveable jaw B having fixed therein a screw spindle C in the
manner substantially as described and shown.
Dated this 25th day of August 1890.