IMPROVEMENTS IN PARALLEL VICES
Year: 1885

page_text: I, IGNAZ QURIN Manufacturer residing at Düsseldorf in the Kingdom of Prussia,
German Empire do hereby declare the nature of my Invention for IMPROVEMENTS
IN PARALLEL VICES, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
In the construction of this vice with a parallel movement of the jaws, the type
of the ordinary vice has been preserved as much as possible, so that the workman
can use it as conveniently as the one he has been accustomed to.
It, however, differs essentially from the appliances of this kind already known
in the following points, as will be seen from the description and drawings, in which
Fig 1 is a side view, Fig 2 a sectional view, Fig 3 plan, Figs 4 5, 6, 7, 8, 9, 10, 11,
12 and 13 detailed parts. The two screws C and D used for obtaining the parallel
motion are connected by a guide with the front stretcher or jaw B, and move
forward uniformly with the same. The regular motion is produced by the gearing-
box K situated on the stretcher B. The two screws C and D have the same pitch
and direction of thread and are actuated by the transmission mechanism. By the
employment of three toothed wheels, the distance of C and D can be made as great
as possible, and, by using the endless chain, it can be extended at pleasure.
By the introduction of an end-play between the screws C and D, the upper
screw C can be twisted tighter, while the under screw D remains motionless.
These improvements are shown in the accompanying drawings, in which C and D
are the screws, B is the fore cheek having a parallel motion with the gearing box K,
which contains the gearing wheels G. T and H. The wheels G and H are fixed to
the spindles C and D; the intermediate wheel T turns with the pin m in the
cheek B, or works loose on the fixed pin m.
The fixed cheek A carries the hollow screws E and F, in which work the screwed
spindles C and D.
The fixed cheek A is provided with a support a, reaching to the ground and
fastened to the bench. The plate e also serves to secure the vice to the bench.
The cheeks o serve to guide the stretcher B which has a parallel motion.
As the two spindles C and D work evenly in the moveable stretcher B, the
shortest length of spindle is obtained, considerably shorter than by any of the
parallel vices hitherto known, and yet, the whole outward form of the usual vice
with a curved movement can be preserved, so that the workman has not to accustom
himself to a new form. Figs 4 to 13 represent two modifications of this new vice,
Figs 4 to 7 showing a construction, in which the screws C and D are provided with
chain-wheels L and M, receiving their motion from the pitch-chain N. A box O is
attached to the cheek B of this vice, as a protection for the wheels.

page_text: As can be seen from Figs 5, 6, and 7, a contrivance for stretching the chain N is
attached to the box O by means of the crank-lever n, the slide o and the roller r.
It serves to tighten or slacken the chain, the latter case being shown in Fig. 7.
The object of this arrangement is to effect a slight rotary movement for the purpose
of tightening the grip by, means of the upper screw alone, after the roller r has
been disengaged, without the lower screw D being acted on by the chain N, and so
too much strain is not put on the chain.
The second modification is shown in Figs 8 to 13.
In the fore-part of the screw D, passing through the cheek B, there is a steel
spring 8, fixed by its hinder extremity in a slit or groove in the screw D, whilst, in 1
the fore-part of the groove, it can turn to the right, but, on being turned to the
left, the edges of the spring lie against the edges of the groove.
The chain-wheel M, working loosely on the projecting part of D, has two grooves
in its nave, placed opposite to each other, which are carried by the projecting
edges of the spring 8, Figs 8, 9, 10 and 11. Fig. 12 shows the spring in a state of
tension.
When an object is to be clasped; the spring & is twisted by turning to the right,
and, by turning to the left, the vice is loosened, and so the wheel M turns to the
left, until the spring a lies with its edges against the edges of the groove in the
screw D; on turning still more, the two screws C and D retire at the same time
with the cheek B.
In this vice, the check B is hollowed out to receive the chain-wheels L and M
and the chain, and is closed with a cover u of wrought iron which is provided with
an opening for the upper screw, as shown by a dotted line in Fig. 9; this con-
trivance is also applied to the protection boxes K and O.
The construction of the vice described can be used for work in, wood as well as
metal, and, for the former purpose, some of the parts could be made of wood.
The arrangement of the spring 8 inserted in the screw D, and shown in Figs 8
to 13 can also be applied to such vices as are represented in Fig 1, 2 and 3.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
In parallel vices
1 The combination of a fore-stretcher or jaw B, having a parallel motion,
provided with two screw-spindles C and D working in guides, with the hinder
cheek or jaw A carrying the screw-nuts E and F for the purpose of guiding and
controlling the moveable stretcher or jaw B.
2-The transmission of the motion of the spindle C to the spindle D by means
of three toothed wheels G, T and H gearing into each other, or, by means of the
chain-wheels L and M in combination with the endless chain N. for the purpose of
giving the spindles C and D an equal rate of movement, and the greatest distance
between their axes.
3-The introduction between the spindles C and D, for the purpose of tightening
the grip with the upper spindle, C. of the chain N, and stretching roller r or a
moveable spring 8 in the notches x.