Clamping device

A clamping device includes a first and a second clamping yoke (36, 38), which are mutually adjustable in a plane of movement. The first clamping yoke (36) carries two mounting jaws (82), each having a first angular clamping surface (86), which is arranged at an angle .alpha..sub.1 <180.degree. relative to the other first angular clamping surface and perpendicular to the plane of movement (58), so that the first angular clamping surfaces form a first prismatic workpiece receptable open towards a mounting jaw of the second clamping yoke. Said clamping device also includes a spindle (42), extending parallel to the plane of movement, for adjusting the position of the clamping yokes relative to each other. To improve said clamping device in such a manner that it can be adapted to a maximum of clamping operations of the type that are usually performed in workshops, an additional jaw (104) can be added on the first clamping yoke, having a flat clamping surface facing one of the mounting jaws of the second clamping yoke and closer to the latter than the first angular clamping surfaces.

The invention relates to a clamping device comprising a first and a second 
clamping yoke adjustable relative to each other in a plane of motion, with 
the first clamping yoke carrying two main jaws each having a first angle 
clamping surface arranged at an angle of .alpha..sub.1 &lt;180 degrees 
relative to the other first angle clamping surface and perpendicularly to 
the plane of motion so the first angle clamping surfaces form a first 
prismatic workpiece receiving means open towards the main jaw of the 
second clamping yoke, and further comprising a spindle extending parallel 
to the plane of motion for adjustment of the clamping yokes relative to 
each other. 
Such clamping devices are known as so-called angle clamps from, for 
example, German patent 3 244 022. The disadvantage of these angle clamps 
is to be seen in that these are only suitable for clamping angles but are 
not suited for other clamping requirements occurring, for example, in a 
mechanical workshop. 
The object underlying the invention is, therefore, to so improve a clamping 
device of the kind described at the beginning that it is suitable for as 
many as possible of the clamping requirements occurring in an ordinary 
workshop. 
This object is accomplished in accordance with the invention with a 
clamping device of the kind described at the beginning by a first 
supplementary jaw with a first flat clamping surface which faces the main 
jaw of the second clamping yoke and lies closer to it than the first angle 
clamping surfaces being insertable into the first clamping yoke. The gist 
of the invention is to be seen in the fact that with the exchangeable 
supplementary jaw, the first clamping yoke with its angle clamping 
surfaces is convertible for parallel clamping and so all kinds of flat 
clamping requirements can be met, for example, on this first flat clamping 
surface. 
It has proven particularly expedient for the main jaws of the first 
clamping yoke to be spaced from each other so that the first angle 
clamping surfaces end in spaced relation to each other and form a 
through-opening on a side of the workpiece receiving means facing away 
from the second clamping yoke. Hence two parts can be clamped at an angle 
.alpha..sub.1 relative to each other in a particularly preferred manner in 
the first clamping yoke. It has proven advantageous, in particular for 
strip-shaped parts, for the main jaws of the first clamping yoke to have 
delimiting surfaces facing away from the second clamping yoke which 
include an angle of 180 degrees - .alpha..sub.1 with the respective first 
angle clamping surfaces and stand perpendicularly on the plane of motion. 
In the embodiments of the inventive solution described so far, no details 
were given as to the design of the second clamping yoke. This is not 
absolutely essential to the gist of the invention for independently of the 
design of the second clamping yoke and due to the design of the first 
clamping yoke with the main jaws and the first supplementary jaw, clamping 
of round parts, clamping of two parts aligned at an angle .alpha..sub.1 to 
each other and parallel clamping with the aid of the supplementary jaw are 
possible. Within the scope of the inventive solution, it is, therefore, 
conceivable for a flat clamping surface to be made available on the second 
clamping yoke and this flat clamping surface can be arranged directly on 
the clamping yoke or on an insertable supplementary jaw. 
It has, however, proven advantageous for the second clamping yoke to carry 
two main jaws each with a second angle clamping surface arranged at an 
angle of .alpha..sub.2 &lt;180 degrees relative to the other second angle 
clamping surface and perpendicularly to the plane of motion so the second 
angle clamping surfaces form a second prismatic workpiece receiving means 
open towards the main jaw of the first clamping yoke. 
In such an embodiment, large cylindrically or differently shaped parts can 
be clamped in the vertical direction in a highly advantageous manner using 
only the main jaws with the first and second angle clamping surfaces. 
For angle clamping, it has similarly proven expedient for a second 
supplementary jaw with a flat clamping surface which faces the first 
supplementary jaw of the first clamping yoke and lies closer to it than 
the second angle clamping surfaces to be insertable into the second 
clamping yoke. 
It is, furthermore, advantageous for the main jaws of the second clamping 
yoke to be spaced from each other so the second angle clamping surfaces 
end in spaced relation to each other and form a through-opening on a side 
of the workpiece receiving means facing away from the first clamping yoke. 
In the same way as with the first clamping yoke, it is similarly 
advantageous for the main jaws of the second clamping yoke to have 
delimiting surfaces facing away from the first clamping yoke which include 
an angle of 180 degrees - .alpha..sub.2 with the respective second angle 
clamping surfaces and stand perpendicularly on the plane of motion. 
In the embodiments described so far, it was merely explained that the 
supplementary jaws are insertable into the respective clamping yoke, but 
it was not specified how this is to be carried out particularly 
expediently. To provide good support for the supplementary jaws, it is 
advantageous for both the first and the second supplementary jaws to be 
supported on the respective angle clamping surfaces. 
In addition, in an advantageous embodiment, each of the supplementary jaws 
is held in a positively connected manner in the first clamping yoke so 
that a defined position is imparted to it. 
Since the main jaws of both the first and the second clamping yokes must be 
of such stable design that the necessary clamping forces can be applied 
with these, it is particularly expedient for each of the supplementary 
jaws to embrace the main jaws of the clamping yoke in a positively 
connected manner as the simplest positively connected fixing is achieved 
in this way. In particular, this is implemented by the supplementary jaw 
resting in a positively connected manner against the angle clamping 
surfaces and the delimiting surfaces. 
With the embodiments described so far, it is possible to clamp cylindrical 
parts and to a limited extent parts arranged at an angle to each other. It 
is, however, particularly expedient for a supplementary angle jaw which 
cooperates with the first angle clamping surfaces for angle clamping to be 
insertable in the second clamping yoke. The angle clamping jaw preferably 
comprises two third angle clamping surfaces which are arranged at an angle 
of 360 degrees - .alpha..sub.1 to each other and are advanceable up to the 
first angle clamping surfaces by adjustment of the clamping yokes. Hence 
the same clamping requirements can be met with such a supplementary angle 
jaw as with the known angle clamps. 
Within the scope of the present invention, it is likewise conceivable to 
insert in the first clamping yoke a supplementary angle jaw which, for its 
part, then has, for example, third clamping surfaces with an angle of 360 
degrees - .alpha..sub.2, which is particularly expedient when the angles 
.alpha..sub.1 and .alpha..sub.2 are of different sizes so angle clamping 
requirements with different angles .alpha..sub.1 and .alpha..sub.2 can be 
met with the different angles .alpha..sub.1 and .alpha..sub.2 and hence 
depending on which main jaws are worked with, the clamping device 
comprises two angle clamps with different angles. 
In the case of the supplementary angle jaw, too, it has proven expedient 
for it to be held in a positively connected manner on the second clamping 
yoke. 
For stability reasons, it is particularly expedient for the supplementary 
angle jaw to be supported on the main jaws of the second clamping yoke. 
To likewise obtain a particularly stable connection, provision is made for 
the supplementary angle jaw to embrace the main jaws of the second 
clamping yoke in a positively connected manner, which, in particular, is 
implemented by the supplementary angle jaw resting in a positively 
connected manner against the angle clamping surfaces and the delimiting 
surfaces of the main jaws of the second clamping yoke. 
It is expedient for all supplementary jaws held in a positively connected 
manner, i.e., also the supplementary angle jaws, to be fixable by holding 
elements. 
Within the scope of the present invention, it has proven particularly 
expedient for the angle .alpha..sub.1 to be 90 degrees so angle clamping 
at a right angle is possible with the first clamping yoke and its main 
jaws as this represents the angle clamping requirement occurring most 
often. 
In like manner, it is advantageous for the angle .alpha..sub.2 to be 90 
degrees so that angle clamping at a right angle is also possible here. It 
does, however, also lie within the scope of the invention to provide the 
angle .alpha..sub.2 as an alternative to the angle .alpha..sub.1, for 
example, with 60 degrees. 
To enable the supplementary jaws provided for the first and second clamping 
yokes to be exchanged for one another, provision is made for the main jaws 
of the first and second clamping yokes to be of identical design so that 
the first and second supplementary jaws which can be placed in a 
positively connected manner on these and also the supplementary angle jaw 
can be placed on either the first or the second clamping yoke. 
To enable parallel clamping, in particular, with the flat clamping 
surfaces, it has proven expedient for a relative movement of the clamping 
yokes to be limited to one direction by a parallel guiding element which 
is additionally connectable with these. This parallel guiding element is 
preferably a guide bar which is insertable into one respective guide bore 
in each clamping yoke and thereby guides the clamping yokes parallel to 
each other. 
The parallel guiding element must be aligned parallel to the spindle to 
enable adjustment of the clamping yokes. It is particularly expedient for 
the parallel guiding element to be fixable on a clamping yoke. 
In a further advantageous embodiment of the inventive clamping device, 
provision is made for a center jaw with double-sided flat clamping 
surfaces to be arranged between the clamping yokes. The center jaw is 
guided for free displacement on two parallel guiding elements and enables 
two parts to be simultaneously clamped between the center jaw and one 
respective clamping yoke. 
In principle, it is possible to design the inventive clamping device such 
that the spindle displaces both clamping yokes. It is, however, 
particularly simple for the spindle to be held on the first clamping yoke 
for rotation about its axis, but immovably in its axial direction. For 
actuation of the spindle, the latter can then protrude beyond the first 
clamping yoke on a side opposite the second clamping yoke and carry an 
actuating element, in particular a turning handle. 
In such an embodiment, it is expedient for the second clamping yoke to be 
held on a spindle nut of the spindle. 
To make it possible for wedge-shaped workpieces to also be clamped with the 
flat clamping surfaces in the inventive clamping device, it is 
advantageous for the spindle to be held on the first clamping yoke for 
pivotal motion about an axis perpendicular to the plane of motion. 
To also meet angle clamping requirements where strip-shaped workpieces of 
different thicknesses are to be clamped at an angle to each other, it has 
proven expedient for the second clamping yoke to be held on the spindle 
for pivotal motion about an axis perpendicular to the plane of motion. 
In the embodiments described so far, it was not explained in detail how the 
two clamping yokes are to be fixed. In an advantageous embodiment, 
provision is made for the first clamping yoke to be fixedly connected to a 
main body and so only the second clamping yoke is movable relative to the 
main body. 
Guides may be provided on the main body for the second clamping yoke. 
However, to enable this second clamping yoke to move freely, it is 
expedient for the main body to have a slide plate for the second clamping 
yoke on which the latter can slide and move freely on the plane of motion. 
To also enable clamping of long workpieces in the vertical direction, i.e., 
transversely to the plane of motion, with the inventive clamping device, 
it has proven expedient for the first clamping yoke to be held on an arm 
extending from the main body. With such a solution, workpieces can be 
clamped particularly expediently in the vertical direction if the arm 
extends between the clamping yokes sidewardly from the spindle in one 
direction only so the workpiece can extend as far as to the spindle in the 
other direction. 
In a particularly advantageous embodiment, the main body has a guide for an 
end piece of the spindle facing away from the first clamping yoke. This 
ensures an additional increase in the stability of the two clamping yokes, 
in particular in the event of high stresses. 
Structurally, this is achieved in the simplest way by the guide being 
formed by a guide slot in a guide body surrounded by the main body so the 
end piece can extend into it. 
In principle, the guide may be designed so as to guide the end piece of the 
spindle in directions opposite to each other. However, insofar as 
provision is made for the second clamping yoke to slide on a slide plate, 
it is sufficient for the guide to secure the spindle against movement away 
from the slide plate so that the spindle cannot move away from the slide 
plate during clamping with large forces. 
In particular in an embodiment in which the spindle is to be pivotable 
relative to the clamping yokes, it is expedient for the guide to allow 
pivotal motion of the spindle, with pivotal motion preferably being 
permitted about the pivot axis of the spindle in the first clamping yoke. 
In a further preferred embodiment, provision is made for the main body to 
comprise compartments which may serve to store, for example, the 
supplementary jaws and the supplementary angle jaw. For this purpose, the 
main body is advantageously of box-shaped design in the region of 
attachment to a workbench. It is expedient for a drawer to be insertable 
into the main body. 
There is, furthermore, peculiar to all known clamping devices the problem 
of picking up parts which fall down, for example, also chips. Within the 
scope of the inventive solution, this problem can be eliminated by 
providing in the main body a collecting dish which is positionable in the 
region between the clamping yokes and below the latter. It is then 
advantageous for this collecting dish to be adapted to be pushed into the 
box-shaped main body, for example, into a compartment thereof when it is 
no longer required. 
The diversity of the inventive clamping device is further improved by the 
main body comprising attachment means for supplementary apparatus. The 
attachment means are advantageously in the form of recesses in the main 
body which are insertable into the various supplementary apparatus. In 
particular, to enable sawing work to be carried out at different miter 
angles, it is expedient to provide a saw guide which is insertable in an 
attachment means and comprises a vertical guide extending perpendicularly 
to the plane of motion for a saw. 
For this purpose, it is advantageous to provide the vertical guide with a 
horizontal guide in which the saw is guided for displacement in the sawing 
direction. 
The diversity of the inventive clamping device can also be increased by the 
main body having an anvil. This anvil is advantageously arranged on a side 
of the main body opposite the first clamping yoke, or two anvils are 
arranged laterally on opposite sides of the main body. It is, furthermore, 
expedient for the anvil to have edges for bending or beading.

An embodiment of the inventive clamping device, illustrated in FIG. 1, 
comprises a box-shaped main body 10 which can be placed with a bottom 
supporting surface 12 on a table 14 or a similar base. Integrally formed 
on this box-shaped main body 10 is a front abutment shoulder 16 which 
protrudes downwards at a right angle to the supporting surface 12 for 
attachment to a front edge 18 of the table 14. In a region remote from the 
abutment shoulder 16, fastening links 20 with an elongate hole 22 are also 
integrally formed on the main body 10 for attachment of the latter to the 
table 14. 
The abutment shoulder 16 is designed as part of a front side 24 of the 
box-shaped main body 10 via which, as shown, in particular in FIG. 4, an 
arm 26, comprising a vertical center web 28 and two transverse webs 30 and 
32 integrally formed on either side thereof in T-shaped configuration, 
protrudes forwards. 
A first clamping yoke 36 is fixedly mounted on a front end 34 of this arm 
26, while a second clamping yoke 38 is displaceable on a slide plate 40 of 
the main body 10 located opposite the supporting surface 12. This slide 
plate 40 closes off the top of the box-shaped main body 10 and passes into 
the transverse web 30 of the arm 26, thereby extending as far as to the 
first clamping yoke 36. 
A spindle 42 extending through both clamping yokes 36, 38 is provided for 
displacing the second clamping yoke 38 on the slide plate 40. As shown in 
FIGS. 2 and 3, the spindle 42 has in the region of its front end a 
thread-free section 44 which is rotatably mounted in a spindle bearing 
block 46. The thread-free section 44 is delimited on both sides by annular 
discs 48 which each rest against end faces 50 of the spindle bearing block 
46 so the spindle 42 as a whole is held in the spindle bearing block 46 so 
as to be immovable in the direction of its longitudinal axis 52 but 
rotatable about the longitudinal axis 52. 
The spindle bearing block 46, for its part, is provided with oppositely 
located pins 54 arranged coaxially with a first pivot axis 56 which stands 
perpendicularly on a plane of motion 58 of the second clamping yoke 38 
defined by the slide plate 40. 
The spindle bearing block 46 is received in the first clamping yoke 36 in 
an opening 60 which extends through the latter and is wider than the 
spindle bearing block 46 transversely to the first pivot axis 56 so the 
spindle bearing block is pivotable about the first pivot axis 56. The 
pivotable mounting of the spindle bearing block 46 is implemented by the 
pins 54 engaging bores 62 of the first clamping yoke 36. To provide 
optimal pivoting possibilities for the spindle bearing block 46, the 
opening widens from the bores 62 outwards in the direction of the 
longitudinal axis 52 of the spindle 42. 
Adjoining the thread-free section 44, the spindle 42 has in the region 
thereof extending over the slide plate 40 a threaded section 64 carrying a 
spindle nut 66. The spindle nut 66 is of similar design to the spindle 
bearing block 46. It is likewise arranged in an opening 68 of the second 
clamping yoke 38 and has pins 70 which likewise extend into bores 72 of 
the second clamping yoke 38 and thereby mount the spindle nut 66 on the 
second clamping yoke 38 for pivotal motion about a second pivot axis 74 
which likewise stands perpendicularly on the plane of motion 58. The 
opening 68 is designed in the same way as the opening 60 in that it widens 
in the outward direction starting from the bores 72 to enable adequate 
pivoting of the spindle nut 66. 
Both the first clamping yoke 36 and the second clamping yoke 38 each 
comprise a main block 76 and 78, respectively, but the main block 76 of 
the first clamping yoke 36 is firmly screwed to the front end 34 of the 
arm 26 while the second main block 78 has a sliding surface 80 facing the 
slide plate 40 for supporting itself on the slide plate 40. 
Two main jaws 82 and two main jaws 84, respectively, arranged symmetrically 
with the respective pivot axis 56 and 74, respectively, rise from the 
respective main block 76 and 78, respectively. Each of the main jaws 82 
has a first angle clamping surface 86 and each of the main jaws 84 a 
second angle clamping surface 88. As shown in FIG. 2, the first two angle 
clamping surfaces 86 of the main jaws 82 are arranged at an angle 
.alpha.=90 degrees relative to each other and form a prismatic receiving 
means opening towards the second clamping yoke 38 for a workpiece 90 which 
may, for example, be a round cylinder. The second angle clamping surfaces 
88 of the two main jaws 84 are likewise arranged at an angle of .alpha.=90 
degrees relative to each other and similarly form a prismatic receiving 
means open towards the first clamping yoke 36 for the workpiece 90. 
The two main jaws 82 and 84, respectively, do not touch each other with 
their first and second angle clamping surfaces 86 and 88, respectively, 
but rather the latter are arranged with their inner side edges 92 and 94, 
respectively, in spaced relation to each other so as to leave between the 
two main jaws 82 and 84, respectively, a through-opening 96 and 98, 
respectively, delimited by the inner side edges 92 and 94, respectively. 
Adjoining these inner side edges 92 and 94, respectively, on a side 
opposite the respective other clamping yoke 38 and 36, respectively, are 
rear delimiting surfaces 100 and 102, respectively, which include with the 
first angle clamping surfaces 86 and the second angle clamping surfaces 
88, respectively, an angle of 180 degrees - .alpha., i.e., likewise 90 
degrees. Both the first angle clamping surfaces 86 with the associated 
delimiting surfaces 100 and the second angle clamping surfaces 88 with the 
associated delimiting surfaces 102 stand perpendicularly on the plane of 
motion 58. 
A first supplementary jaw 104 with a supporting body 106 which engages 
between the two main jaws 82 can be placed on the first clamping yoke 36. 
The supporting body 106 lies with supporting surfaces 108 against the 
first angle clamping surfaces 86 and engages behind the main jaws 82 by 
holding surfaces 110 resting against the delimiting surfaces 100 so the 
supporting body 106 is received in a positively connected manner between 
the two main jaws 82 and can be lifted off upwards perpendicularly to the 
plane of motion 58. The first supplementary jaw 104 is, furthermore, 
provided with a flat clamping jaw 112 which is held on the supporting body 
106 and carries a flat clamping surface 114. The flat clamping jaw 112 is 
held on the region of the supporting body 106 carrying the supporting 
surfaces 108 and arranged so as to point with its flat clamping surface 
114 in the direction of the second clamping yoke 38 when the first 
supplementary jaw 104 is inserted in the first clamping yoke 36, with the 
flat clamping surface standing perpendicularly on the plane of motion 58 
and preferably including the same angle with the two supporting surfaces 
108 arranged on opposite sides of the supporting body 106. 
A second supplementary jaw 116 designed in the same way can be placed on 
the second clamping yoke 38 and similarly comprises a supporting body 118 
with supporting surfaces 120 and holding surfaces 122 so that it can 
likewise be placed from above on the second clamping yoke 38 and is held 
in a positively connected manner by the main jaws 84. In addition, in the 
same manner as in the first supplementary jaw 104, a flat clamping jaw 124 
is provided with a flat clamping surface 126. 
With the first and the second supplementary jaws 104 and 116, respectively, 
the inventive clamping device is constructed like a conventional vise but 
with the additional advantages that the spindle 40 is articulatedly 
mounted on both the first clamping yoke 36 and the second clamping yoke 38 
and, therefore, in addition to parallel clamping, wedge-shaped parts can 
also be clamped. 
Instead of the first supplementary jaw 104 or the second supplementary jaw 
108, it is, however, also possible, as shown in FIGS. 8 to 10, for a 
supplementary angle jaw 128 to be insertable in the respective clamping 
yoke 36 and 38, respectively. In FIG. 8, this supplementary angle jaw 128 
is inserted in the second clamping yoke 38. This supplementary angle jaw 
128 also comprises a supporting body 130 which rests by means of 
supporting surfaces 132 and holding surfaces 134 in a positively connected 
manner against the second angle clamping surfaces 88 and the delimiting 
surfaces 102 in the same way as the first or second supplementary jaw 104 
and 116, respectively, and is removable in the upward direction. In 
contrast with the first or second supplementary jaws 104 and 116, 
respectively, the supplementary angle jaw carries an angle clamping jaw 
136 protruding in the direction of the first clamping yoke 36 with a tip 
138 pointing towards the first clamping yoke 36 with adjoining third angle 
clamping surfaces 140 on both sides thereof which, for their part, are 
arranged at an angle of .alpha.=360 degrees - .beta. relative to each 
other. 
When working with such a supplementary angle jaw 128 in the second clamping 
yoke 38, one works without a supplementary jaw in the first clamping yoke 
36 so the angle clamping jaw 136 protrudes into the prismatic receiving 
means formed by the first angle clamping surfaces 86 and hence is, for 
example, capable of clamping two strip-shaped workpieces 142 and 144 at an 
angle relative to each other, as shown in FIG. 8. If the strip-shaped 
workpieces 142 and 144 are of different thicknesses, this is compensated 
by the spindle 42 being pivoted relative to the two clamping yokes 36 and 
38, respectively, and hence the second clamping yoke 38 is advanced 
relative to the first clamping yoke in a laterally displaced position 
towards the latter, with the second clamping yoke 38 being able to slide 
with the sliding surface 80 on the slide plate 40 both in the direction of 
the longitudinal axis 52 of the spindle 42 and transversely thereto. 
To enable exact parallel clamping with the embodiment of the inventive 
clamping device according to FIG. 5, provided with the first supplementary 
jaw 104 and the second supplementary jaw 116, the two clamping yokes 36 
and 38, respectively, can be fixed in an initial position relative to each 
other such that their flat clamping surfaces 114 and 126 stand parallel to 
each other and the longitudinal axis 52 of the spindle also preferably 
extends parallel to the plane of motion 58 and perpendicularly to the flat 
clamping surfaces 114 and 126, respectively. This fixing is preferably 
implemented by two guide bars 146 and 148, respectively, which extend in 
guide bores 150 and 152, respectively, through both the first clamping 
yoke 36 and the second clamping yoke 38 on either side of the spindle 42 
parallel to its longitudinal axis 52 so the second clamping yoke 38 slides 
exactly parallel to the first clamping yoke 36 on the slide plate 40 owing 
to these guide bars 146 and 148, respectively. These guide bars 146, 148 
are removable so that, for example, in the case of angle clamping 
according to FIG. 8, one can work without these. 
To increase the flexibility of the inventive clamping device, during 
parallel clamping with the first and second supplementary jaws using the 
guide bars 146 and 148, respectively, a center jaw 154 may be used in 
addition. This is slidingly guided on the guide bars 146 and 148, 
respectively, and has two flat clamping surfaces 156 and 158 which are 
oriented parallel to the flat clamping surfaces 114 and 126. The center 
jaw 154 is freely movable between the first clamping joke 36 and the 
second clamping yoke 38 and so two different parts can be simultaneously 
clamped between the flat clamping surface 114 and the flat clamping 
surface 156 and between the flat clamping surface 158 and the flat 
clamping surface 126. 
Furthermore, to enable flat clamping of parts extending perpendicularly to 
the plane of motion 58, in particular at least without use of the guide 
bar 148, the transverse webs 30 and 32, as shown, in particular in FIGS. 4 
and 5, are of asymmetrical design relative to the center web 28 so that 
these extend in FIG. 4 substantially to the left, but only to a slight 
extent - approximately as far as an outer circumference of the spindle 42 
- to the right so that such a workpiece can be clamped to the right of the 
spindle 42 without being obstructed by the transverse webs 30 and 32, 
respectively. 
Turning of the spindle 42 is carried out in the well-known manner by a 
lever 160 which is slidingly mounted in a bore 162 of an end piece 164 of 
the spindle, with the end piece 164 protruding forwards beyond the first 
clamping yoke 36 and hence adjoining the thread-free section 44 opposite 
the threaded section 64. 
The box-shaped main body 10 is additionally provided with two compartments 
166, 168 which are accessible through front openings 170 and 172, 
respectively, in the front side 24 of the main body 10. The compartments 
166, 168 may, for example, serve to accommodate the first and second 
supplementary jaws 104, 116 or also the supplementary angle jaw 128. In 
addition, there is mounted in the compartment 168 for withdrawal therefrom 
a collecting dish 174 which lies with its upper edge above the plane of 
motion 58 and hence can be pulled out so far that it extends under a 
clearance 175 delimited by the guide plate 40, the transverse web 30 and 
the front end 34 and thereby, for example, receives all the chips 
occurring in the region between the clamping yokes 36, 38 or also other 
parts. The collecting dish 174 is preferably mounted in a frame with 
drawer-like guides, for example, pull-out rails. 
An anvil 176 with edges for bending and beading is integrally formed as 
accessory on the main body 10 opposite the front end 34. Side bodies 178 
with receiving bores 180 extending perpendicularly to the plane of motion 
58 for supplementary apparatus are provided on both sides of the main body 
10. As shown in FIG. 12, vertical guides 182 are, for example, insertable 
in these receiving bores. The vertical guides have a cylindrical end piece 
184 which is insertable in the receiving bore 180 and is supported with an 
annular collar 186 on an upper edge of the receiving bore 180. Extending 
upwards from the annular collar 186 is a four-edged guide 188 on which a 
saw guide 190 is displaceable in the vertical direction and fixable by a 
set screw 192. The saw guide 190 comprises a guide block 194 which 
surrounds the four-edged guide 188 on all sides and on which a U-shaped 
receiving means 198 is mounted for pivotal motion about a horizontal axis 
196. Displaceably mounted in this U-shaped receiving means 198 is, for 
example, a saw 202 having a rectangular tube 200 and being guided by the 
U-shaped receiving means 198 in such a way that a saw blade 204 of the saw 
202 is vertically oriented. 
To fix a miter angle of the saw blade 204 relative to a workpiece clamped 
between the clamping yokes 36 and 38, the entire vertical guide 182 is 
rotatable in the receiving bore 180 and fixable in its turned position by, 
for example, a set screw 206, with the set screw 206 acting on the end 
piece 184. 
To prevent the saw 202 from falling out of the U-shaped receiving means 
198, the latter is closable by a cotter pin 208 which is arranged such 
that the rectangular tube 200 is movable in its longitudinal direction in 
the receiving means 198 but cannot leave the latter on its open side. 
As an alternative to receiving the saw 202, the inventive vertical guides 
182 may also guide tracing aids, receive bridges or act as carriers for 
lamps. 
In a particularly preferred embodiment of the inventive four-edged guide 
182, the end piece 184 is provided with fixing recesses 210 which exhibit 
identical angular spacings from one another in all quadrants but are 
machined in the end piece 184 so as to begin with a different initial 
angle in each quadrant. For example, 90 degree, 60 degree and 30 degree 
bores are provided in one quadrant, 75 degree, 45 degree and 15 degree 
bores in the opposite quadrant and 7.5 degree and 37.5 degree bores in the 
quadrant therebetween (FIG. 13). 
As shown additionally in FIG. 11, the supporting bodies 106 and 118, 
respectively, are fixable on the clamping yokes 36 and 38, respectively, 
by screws 212. Alternatively, the screws 212 may also be designed as 
locking elements. 
In a second embodiment, illustrated in FIGS. 14 and 15, insofar as the same 
parts are used, these bear the same reference numerals and, therefore, 
reference is to be had in this connection to the statements on the first 
embodiment. 
In contrast with the first embodiment, the main body 10 comprises two side 
bodies 220 which are arranged on both sides of a center body 222 and with 
their front sides 224 terminate flush with the front side 24 of the center 
body 222. Spaced from these side bodies on a side opposite the arm 26 
laterally of the center body 222 are two anvil bodies 226 which extend 
upwards beyond the plane of motion 58 and enclose the plane of motion 58 
between them in the rear region of the center body 222. Each of the anvil 
bodies 226 is provided with an anvil surface 228 extending substantially 
parallel to the plane of motion 58. 
Extending between these anvil bodies 226 is a guide body 230 with a guide 
slot 232 which is open towards the second clamping yoke and into which the 
spindle 42 extends with a rear end piece 234 opposite the shaft piece 164. 
With this end piece 234, the spindle is guided in the guide slot 232. For 
this purpose, the end piece 234 of the spindle 42 is provided with a 
cylindrical, thread-free attachment 236 which is rotatably mounted in a 
slide piece 238. This slide piece 238 is held non-displaceably by the end 
piece 234 by an annular flange 240 adjoining the cylindrical attachment 
236 at the transition to the threaded section 64 and a safety ring 242 
being seated on the opposite side of the attachment 236. 
This slide piece 238 has on its top side opposite the slide surface 58 an 
abutment surface 244 which rests slidingly on a guide surface 246 of the 
guide body 230. 
Owing to the rotatable mounting of the cylindrical attachment 236 in the 
slide piece 238, the spindle 42 can be turned without the slide piece 238 
turning with it. 
The guide slot 232 is designed so as to represent a segment of an arc of a 
circle concentric with the pivot axis 56 of the pin 54 and lying parallel 
to the plane of motion 58 so that during all pivotal motions of the 
spindle 42 about the pivot axis 56, the slide piece 238 can run with the 
abutment surface 244 along the guide surface 246 which likewise has the 
shape of an arc of a circle. 
The spindle 42 is additionally secured against lifting in the direction 
perpendicular to the plane of motion 58 by the guide surface 246. Securing 
of the spindle 42 against movement in the direction towards the plane of 
motion 58 is unnecessary as the clamping yoke 38 itself lies directly 
slidingly on the plane of motion 58 and hence prevents such movement of 
the spindle. 
For reception of the end piece 234 in a simple manner, the guide body 230 
is preferably of hollow design, and in the simplest case is integrally 
formed on the center body 222. 
Additionally provided in the center body 222 instead of the collecting dish 
174 is a drawer 250 which can be pulled rearwardly out of the center body 
222 in the direction of arrow 252. 
The main body 10 is preferably attached by attachment links 254 which 
extend laterally of the center body 222 between the respective side body 
220 and the respective anvil body 226 and preferably have an elongate hole 
256 for attachment.