The present invention relates to a handtool, and more specifically
to a combination tool in the form of an adjustable spanner, or monkey wrench, comprising
a handle that carries on one end a head which includes one fixed jaw and an adjustable
jaw. The adjustable jaw can be set positionally by means of a manually manipulated
worm screw and includes working surfaces facing away from one another. Each one
of the working surfaces is intended to coact with the fixed jaw working surface
in dependence of how the adjustable jaw is turned.
Monkey wrenches of this kind have been known for almost a century;
see Swedish Patent No. 4 066 granted to J P Johansson on the 11 th May 1892. The
same inventor, J P Johansson, was also the creator of the modern pipe wrench as
we know it today; see Swedish Patent No. 1 636 (17th August 1888). The monkey wrench
and the pipe wrench have been used widely the world over.
Over the past decades different proposals have been made for combining
the monkey wrench with other tools. The majority of these proposals, however, have
resulted in a clumsy combination tool which cannot be used effectively as a monkey
wrench or for any other purpose. For instance such a combined pipe and monkey wrench
is known from US Patent Specification No. 721,444 of 24th February 1903. The combination
tool described therein has an adjustable jaw within which the manually operated
worm screw is journalled. The inside thread of the screw coacts with a threaded
stem separating the working surface of the fixed jaw in two areas. The small length
of the worm screw being restricted by the constructive design makes the use of
the tool uncertain and less reliable. Also, the old-fashioned main design of the
tool makes it quite unsuitable for effective use.
Disclosure of the Invention
Accordingly, the object of the present invention is to provide an
effective combination tool which can be used in a safe and reliable manner. The
fitter using the tool must not be restricted in his work, e g by the tool handle,
and he must be able to do the work with as little movement as can be for having
a good result.
This object is achieved in accordance with the invention in that the
worm screw is journalled in the handle in such a way that the outside thread of
the screw coacts with a rack part formed at the base of a mainly triangular body
belonging to the adjustable jaw, said adjustable jaw having a jaw part which projects
from the apex of said triangular body, where the working surfaces of the adjustable
jaw are formed at the surfaces of the jaw part faced away from one another.
In the case of the inventive combination tool, the two working surfaces
of the reversible adjustable jaw are configured so that, together with the fixed
jaw, they form a spanner-grip engagement either for tightening nuts or bolts, in
accordance with a conventional monkey wrench, and a pipe-wrench grip for tightening
tubular bodies, in accordance with a conventional pipe wrench. The working surface
on the adjustable jaw that forms part of the pipe-wrench grip will preferably have
a teeth pattern of substantially saw-tooth shape with the points of the teeth facing
the slide parth for the adjustable jaw.
In accordance with a preferred embodiment of the inventive combination
tool, the adjustable jaw has substantially the shape of an isosceles triangle.
To make it possible to turn or reverse the working function of the tool the adjustable
jaw has to be moved to a position where the jaw part is free to be turned. This
can be obtained by totally releasing the adjustable jaw from the worm screw. According
to another conceivable embodiment of the adjustable jaw, said jaw part is pivotally
mounted on the apex of the triangular body so as to facilitate switching of the
tool between its monkey-wrench and pipe-wrench functions.
Description of Preferred Embodiments
The inventive combination tool will now be described in more detail
with reference to an exemplifying embodiment of the tool illustrated in the accompanying
drawings, in which
- Fig. 1 illustrates a preferred embodiment of an inventive combination tool,
with the adjustable jaw shown removed from said tool;
- Fig. 2 illustrates the same combination tool with the adjustable jaw turned
to a position for use as a pipe wrench; and
- Fig. 3 again shown the same combination tool, but with the adjustable jaw turned
to a position for use as a monkey wrench.
The inventive combination tool is constructed as a monkey wrench,
or an adjustable spanner and includes a handle 1 which merges at one end with a
head 2. In the fashion of monkey wrench, the head 2 includes an opening 3 in which
a manually manipulated worm screw 4 is rotatably journalled. The head also includes
a fixed jaw 5 which is substantially an extension of one edge 6 of the handle 1.
The jaw 5 has a working surface 7 which faces inwardly from the edge surface 6.
As with conventional monkey wrenches, the inventive combination tool
includes an adjustable jaw 8 having a rack part 10 which in cooperation with the
worm 4, enables the adjustable jaw to be moved along a slidepath 9 provided on
the head 2. According to one preferred embodiment of the invention, the adjustable
jaw 8 can be removed completely from the head 2 and turned or reversed in the manner
indicated by the arrow P in Fig. 1.
The adjustable jaw 8 advantageously has the shape of a triangle, with
the rack part 10 provided on the base thereof. In the case of the illustrated embodiment
of the combination tool, the adjustable jaw 8 has the shape of an isosceles triangle,
the apex of which merges with a jaw part 11. This jaw part 11 has two working surfaces
12, 13, which face away from one another. One working surface, 12, is preferably
smooth and plane-parallel with the working surface 7 of the fixed jaw 5, said working
surface 12 and said working surface 7 together forming a spanner-grip, as illustrated
in Fig. 3. The other working surface 13 is preferably knurled or serrated or provided
with some other pattern and forms together with the working surface 7 of the fixed
jaw 5 an acute angle such as to form a pipe-wrench grip, as illustrated in Fig.
2. The patterned working surface 13 preferably presents a number of mutually parallel,
transversely extending teeth 14 which extend over the working surface essentially
at right angles to the vertical and horizontal tool-setting positions H and S,
as seen in Fig. 1. The teeth pattern 14 has substantially the shape of saw-tooth,
the points of the teeth facing the slide path 9.
The acute angle defined by the working surface 13 of the adjustable
jaw 8 and the working surface 7 of the jaw 5 will preferably be about 15 to 44
degrees. This provides a maximum gripping effect on a cylindrical workpiece, as
indicated in Fig. 2.
The inventive combination tool can thus be used as a pipe wrench,
in accordance with Fig. 2, in which the gripping width can be readily adjusted
by means of the worm screw 4, and also as a conventional monkey wrench, in accordance
with Fig. 3.
When switching the combination tool from a pipe wrench function to
a monkey wrench function, or vice versa, the adjustable jaw 8 is moved by the worm
screw 4 until the adjustable jaw is completely free from the head 2, as illustrated
in Fig. 1. The adjustable jaw 8 can then be turned (the arrow P) so that either
its working surface 12 or its working surface 13 faces towards the working surface
7 of hte fixed jaw 5, so as to obtain the desired tool function, wherafter the
adjustable jaw 8 is returned to the slide path 9 and into engagement with the worm
screw 4, for adjustment to an appropriate gripping width.
A measurement scale 15 may be provided along the slide-path 9 on that
surface of the head 2 which faces towards the fitter when the combination tool
is held in a correct working position, so as to facilitate adjustment of the tool-gripping
width. Such a measuring scale 15 is indicated schematically in Figs. 2 and 3, and
may be graduated in millimetres, inches or some other appropriate unit of measurement.
In this case, the measurement scale 15 is started and finished with stop indicator
areas 19. The two areas 19 are used as a warning to the fitter that the combination
tool must not be used when coacting markers 16, 17 on the adjustable jaw 8 are
within these areas or have passed outside thereof. Thus, the markers 16, 17 have
to stay in between the stop indicators 19, i e the nuts or tubes must not be smaller
than four units and not greater than 45 units as shown with the exemplifying scale
15 in Figs. 2 and 3.
The adjustable jaw 8 is provided with different markers 16, 17, 18.
The markers or indices 16, 18 are assigned the working surface 13, i e are intended
for the pipe wrench grip shown in Fig. 2. The marker 16 coacts with the measuring
scale 15 while the other marker 18 indicates the pipe centre height above the slide
path 9. These two markers or indices 16, 18 coact with the measuring scale 15 only
when the adjustable jaw 8 is turned such that the working surfaces 7 and 13 coact
with one another. Similarly, the marker 17 coacts with the measuring scale 15 solely
when the adjustable jaw 8 is turned for coaction between the working surfaces 7
It will be understood that the invention is not restricted to the
advantageous embodiment of the inventive combination tool described above with
reference to the accompanying drawings and that this embodiment can be modified
with the scope of the invention. Thus, it is conceivable to rotatably mount the
jaw part 11 of the adjustable jaw 8 in the base body. With this alternative, the
adjustable jaw 8 need not be completely removed from the head 2 when changing the
gripping mode of the tool, although the adjustable jaw 8 should be suitably arranged
to pass an outer position before it is possible to turn the jaw part 11. For instance,
the slide path 9 should be constructed to lock the jaw part 11, in a set gripping
position until the adjustable jaw 8 is moved to a release position, in which the
jaw part 11 can be rotated.
The aforedescribed combination tool is intended to function as a pipe
gripping wrench and a monkey wrench. It will be understood, however, that the working
surfaces 7, 12,and 13 can be configured for other purposes, for instance they may
be given configurations appropriate with other known types of wrenches or spanners,
or may be provided with a knife edge or cutter which enables the tool to be used
as a tube cutter, cable stripper, etc. The invention is therefore not restricted
to the specific embodiment described above, but may incorporate all conceivable
variants that lie within the concept of the invention as described in the following