Improvements in Adjustable Wrenches for Bicycles and other Purposes.
Year: 1889

page_text: Date of Application, 25th Feb., 1889
Complete Specification Left, 25th Nov., 1889-Accepted, 28th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Adjustable Wrenches for Bicycles and other
Purposes.
I, AUGUSTUS LEHMANN of Annandale House, Chiswick County of Middlesex Cycle
Agent do hereby declare the nature of this invention to be as follows:-
Most of the adjustable wrenches at present in use are of the pattern of the well
known screw hammer, and have the disadvantage of easily sliding off the screw nut,
and in time bending out, thereby becoming practically useless.
My invention does away with both these draw backs besides giving other advantages
as will appear from the following description.
The head of the wrench is a square or oblong frame, in which a slide moves, either
free, or in groves or guides. The slide fits exactly against two sides of the frame,
and by moving it the space between the slide and the head end of the frame is
enlarged or reduced according to the size of the screw nut to he acted upon. The
slide is connected with a screw which passes through the whole length of the handle
of the wrench and has a knob at the end. By turning this knob the screw turns in
its thread in the handle and moves the slide.
Instead of turning the screw from the end of the handle 1 may turn it by means of
a screw ring adjusted to any other part of the handle, such as is the case with the
ordinary screw hammer. In this case the screw need not pass to the end of the
handle.
The handle can also be made bending out like a bayonnette or in any other way, to
give greater facility for reaching some of the nuts in a machine. In this case the
screw projects immediately from the back of the frame head of the wrench.
A screw driver may be attached to the end of the handle, to shut up like a
corkscrew or a clasp knife, or it can be made to slide in or out.
The handle can also be made to double up by means of a strong hinge.
Another arrangement is to have a head at each end of the handle one for the larger
and one for the sinaller screw nuts. The slides in both heads can be moved either by
one and the same screw, or by two separate screws. This double wrench has the
advantage that the smallest nuts in a bicycle can be much better got at with the
small head of the wrench, than with the larger one.
Instead of making the frame of the head with four square corners inside, the
corners may be rounded off or shaped so as to form an octogen inside the frame, and
the slide can be shaped so as to give the same result inside the frame. This is
principally to strengthen the frame and the slide.
COMPLETE SPECIFICATION.
Improvements in Adjustable Wrenches for Bicycles and other
Purposes.
I, AUGUSTUS LEHMANN of Annandale House, Chiswick, in the county of Middlesex,
Cycle agent 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 :-
Most of the adjustable wrenches at present in use are of the pattern of the well
known screwhammer and have the disadvantage of easily sliding off the screw nut
and in time bending out, thereby becoming practically useless.

page_text: My invention does away with both these drawbacks, besides giving other advantages
as will appear from the following description:
The head of the wrench is a square or oblong frame in which a slide moves, either
free or in groves or guides. I find in practice that the best means of guiding the
slide is by allowing the same to overlap onto the frame on both sides as shown in
section in Fig. V of the drawing.
The slide fits exactly against two sides of the frame, and by moving it the space
between the slide and the head end of the frame is enlarged or reduced, according to
the size of the screwnut to be acted upon.
The slide is connected with a screw which passes through the whole length of the
handle of the wrench as shown in Fig. I of the drawing, and has a knob at the end.
The best knob is that of the pattern of the thumbscrew. By turning the screw in its
thread in the handle it moves the slide.
The handle can also be made bending out as shown in Fig. II, to give greater
facility for reaching some of the nuts on a machine. In this case the screw projects
immediately from the back of the head of the wrench.
A screwdriver may be attached to the end of the handle, either as a fixture, or to
shut up like a clasp knife, or it can be made to slide in or out.
The handle can also be made to double up by means of a strong hinge as shown in
Fig. III.
Another arrangement is to have a head at each end of the handle, one for the
larger and one for the smaller screwnuts. The slides in both heads can be moved
either by one and the same screw as shown in Fig. IV, or by two separate screws.
This double wrench has the advantage that the smaller nuts in a bicycle can he
much better got at with the small head of the wrench than with the larger one.
Instead of making the frame of the head with four square corners inside, the
corners may be rounded off, or shaped so as to form an octogen inside the frame, and
the slide can be shaped so as to give the same result. This is principally to strengthen
the head of the frame.
The best manner of arranging head and slide is that shown in Fig. II, where the
jaws of the slide allow the latter to grip a very small nut.
In all the figures of the drawing the slide is marked S:
Having now particulary described and ascertained the nature of my said Invention
I declare that what I claim is :
1. The manufacture of screw wrenches of the nature and patterns substantially as
herein before described.
2. The manufacture and employment of a slide of the nature and pattern as in
Fig. II substantially as hereinbefore described.
3. The manufacture of wrenches having two heads as in Fig. IV, substantially as
herein before described.
4. The manufacture of wrenches folding up, as in Fig. III, substantially as herein-
before described.
. . Dated this 25th day of November 1889.
A. LEHMANN.