FR2507945A1 - ACCESSORIES FOR A TIGHTENING MECHANISM, PARTICULARLY FOR A VICE OR A WORKBENCH - Google Patents

Abstract

THIS CLAMPING MECHANISM ACCESSORY DESIGNED TO BE USED ON A WORKBENCH INCLUDING A VICE, INCLUDES A PAIR OF OPPOSING JAW SUPPORTS 602 EACH HAVING A POSITIONING PIN 603 WHICH CAN BE PLUGGED IN A COVER SHAPED IN ONE OF THE BODIES . EACH SUPPORT CARRIES A SWIVEL JAW 608 WHOSE PIVOT 609 CAN SLIDE IN A SLOT 612 SO THAT THE JAW CAN BE STRAIGHTENED IN ANY OF A SERIES OF VERTICAL POSITIONS DETERMINED BY SLOTS 615 IN THE SUPPORT. THE SUPPORTS 602 ARE SLIDING MOUNTED ON A COMMON REACTION BAR 605 TO ALLOW THE USER TO MOVE THE JAWS 608 INTO AND OUT OF ONE OF THE OTHER BY OPERATING THE VICE CONTROL CRANKS. A ORDINARY JAW FACE 623 IS MOUNTED ON ONE OF THE JAWS AND A PART SUPPORT FINGER 670 IS ROTATED ON THE OTHER JAW.

Description

The present invention relates to acces-

  Evenings for clamping mechanisms which can be constituted either by a vice or by a workbench having a structure constituted by a vice Thus, the invention is more particularly applicable to accessories for a clamping mechanism incorporating a structure constituted by a vice formed by a pair of vise members having

  vice control means for pulling them closer

  and push them away from each other and a number of upwardly extending holes or recesses opening through the upper surface of each vice member.

  defined as a clamping mechanism of the specific type

trusted.

  The invention is particularly but not excluded.

  applicable to a type of workbench that has been commercially

  successfully marketed under the WORKMATE brand. The latter is a portable workbench with a top or top structure formed by a pair of elongated rectangular beams, one beam having a fixed nature and the other

  beam that can be moved closer and farther

  fixed beam adjustment by a pair of control screws

  de Workbenches of this type are protected by the following British patents: 1,267 O 32; 1,267,033; 1,267,034

  1,267,035; 1,405 to 892: 1,405,893; 1,405,894; 1,405,895

and 1,405,896.

  Among the above patents, the patent 1 237 032 relates specifically to a structure in which the vise members of the workbench can be placed in an oblique arrangement relative to each other by a

  Independent actuation of the vice screws Another short-

  vet n 1 422 521 relates to the production of spaced bores in the vice members which can receive plug-in stops intended to be used to clamp irregularly shaped parts placed on the top of the workbench Figure 9 of this patent shows a locksmith's vice in two parts capable of being mounted on the workbench Each part comprises a cast part dcnt the front face is provided with two V-shaped grooves which intersect Immediately behind the face of the die casting is arranged a steel rod which can

  be positioned in one of the holes in the beams of the

  tau Another anchor is positioned so that

  vcc penetrate another hole in the beam or

  vise beams Experience with such constructions

  tions indicated that problems arise due to the fact that the clamping faces between which a workpiece is received are spaced well above the two lines of force of the bench vise screws. As a result, the reaction caused by the tightening a workpiece tends to rotate the parts of the locksmith's vise around horizontal axes and to reduce the clamping efficiency This action would be even more accentuated if we tried

  increase the height of the stop faces of the two

  the locksmith's vise and, in fact, applying such an insignificant load would tend to rotate the pins or dowels arranged in the holes also around horizontal axes, which could tend to damage the holes formed in the beams

  from the workbench and, in extreme circumstances, to back

  expensive materials from the workbench beams where the holes are positioned closely adjacent to a

edge of the workbench.

  As a result, it has not been previously

  possible to achieve a satisfactory arrangement for

  rer large rooms above the workbench plan

  makes remote charges that are produced.

  According to one aspect of the present invention, an accessory for a clamping mechanism of the specified type comprises a pair of structures connected to each other each having a stopper for applying a force of

  clamping against a part and a base part which

  carries at least one designed downwardly extending lug

  To be received in one of the holes or recesses extending

  upward of the clamping mechanism, the structures

  being interconnected so as to allow movement

  sliding between them to modify the interval between the stops while retaining the stops against tilting movements around axes

  approximately horizontal, generally perpendicular

  eyepieces in the direction of sliding movement, while clamping a workpiece between them while they

  are mounted on the clamping mechanism and during access

  operation of the vice control means.

  The manner in which the restraint of a mo-

  tipping is obtained may vary but a

  particular embodiment includes couplings

  pin and slot elements extending between the coupling parts of each structure Alternatively, other forms of guide may be provided to prevent the

  tilting of the stops For example, the parts of the

  range can be formed by cooperating tubes teles-

  copically, reactions tending to cause rota-

  tion of the stops being counteracted by the coming into support

  faces of the tubes against each other.

  In another embodiment, each struc-

  ture has a coupling portion extending horizontally

  which forms an integral part of its respective base part from which it extends in the direction of the other base part, each base part having a bearing surface oriented downwards in abutment against

  a support surface facing upwards on the other side

coupling tie.

  In another embodiment, each part

  base has a pair of vertical support members -

  horizontally spaced, the upper support member

  laughing downward and the lower Dui

  laughing being oriented upwards and a coupling bar

  separated being arranged to extend horizontally-

  between the basic parts and to be arranged between

  the pair of support members at each end.

  Preferably, the accessory comprises a pair of jaw supports each having a jaw which forms one of the stops and a base part which comprises at least one of the pins extending downwards, one at least jaws being likely to be positioned

  on its support in a position chosen from among a

any number of defined positions.

  According to another aspect of the present invention,

  an accessory is provided for a workbench of the type comprising

  both a top structure constituted by a vice formed by a pair of elongated vice members having vice control means for pulling them in approach and pushing it away from each other and a certain number of upwardly extending holes or recesses opening into the upper surface of each vice member; this accessory includes a pair of structures

  comprising stops having toothed portions extending

  upwardly disposed face to face, a base portion provided on each structure and provided with at least one downwardly extending lug designed to be received in one of the holes or recesses of the workbench and the portions coupling, one provided on each structure, which

  overlap and have a horizontal slit for-

  mée in each coupling part in which is-

  a pin fixed to the other coupling part so as to allow a sliding movement between the structures to modify the interval between the stops and to retain the stops against tilting movements around horizontal axes during the clamping of a part between them while they are mounted on the workbench and during the actuation of the control means

vice.

  According to another aspect of the present invention,

  an accessory includes a pair of structures, each of which

  each has a horizontal bar having, at one end

  miter, a downwardly extending lug designed to be received in one of the holes or recesses extending upward from the workbench and, at the other end, an upwardly extending stopper designed to exert a clamping force against a workpiece, each bar having an elongated horizontal slot in which a pin carried by the other bar is received, so as to

  keep the two bars in a sliding relationship-

  parallel and to retain the stops against

  tilting movements around horizontal axes

  during the tightening of the part between it while the

  stopper is mounted on the workbench and during actuation

means for controlling the vice.

  According to another aspect of the present invention,

  an accessory for a clamping mechanism as specified

  shown above includes a pair of jaw supports each having a jaw adapted to exert a clamping force against a workpiece and a base portion which has at least one downwardly extending lug designed

  to be received in one of the holes or recesses extending

  upward of the clamping mechanism, 3 supports being interconnected so as to allow movement

  sliding between them to change the interval

  be the jaws while retaining the jaws in the

  against tilting movements away from each other around horizontal axes perpendicular to the width of the gap during the clamping of a piece between them while they are mounted on the clamping mechanism and during the 'actuation of the vice control actuators, at least one of the jaws being susceptible

  to be positioned on its support in a chosen position

  sie from a number of defined positions.

  The arrangement makes it possible to roughly position said jaw at the required spacing of the other micholre

  simply by moving it relative to its support up to

  that at one of the defined positions and then we can

  produce the clamping movement of the jaws in action-

  the vice of the type of workbench described above.

  The arrangement allows horizontal clamping loads to be applied at a significant distance above the surface of the workbench without causing

  torsional movements around axes parallel to the lar-

  geur of the faces of the vice members The present invention also offers this advantage in particular as regards

  concerns bulky and very large loads which must

  can be clamped between the jaws and this effect is increased if the jaw supports are connected together

  p Dr a beam extending horizontally in the direction

  the width of the gap between the jaws, each jaw support being unable to rotate

  relative to the beam around a horizontal axis trans-

  across the width of the interval For example, each

  support can be mounted with a sliding adjustment

  tightly tightened along the beam.

  This means that the vice members can be used in their positions of maximum spacing, each jaw support being inserted in one of the vice members, the jaws being arranged in their most spaced defined positions on their supports and the beam being long enough to extend

between the jaw supports.

  Various separable jaw faces can be mounted on the jaws to clamp a workpiece

positioned between the jaws.

  According to another aspect of the present invention.

  it is designed as an accessory for a tightening mechanism that encormorates a structure constituted by a formed vice

  by a pair of vice members having means of com

  vice grip to pull them closer and push them away from each other in a plane

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  approximately horizontal, the vice members having

  clamping faces arranged opposite a pro-

  limited foundry, and a certain number of holes or hollow

  upwardly extending elements opening into the upper surface of each vice member, this accessory comprising a pair of stops designed to exert a clamping force against a workpiece, stops which comprise

  opposite clamping faces having greater pro-

  foundry than that of the vice organs: this accessory

  includes a pair of interconnected structures, each

  one comprising one of the stops and a base part which comprises at least one downwardly extending lug designed to be received in one of the holes or recesses extending upwards of the clamping mechanism,

  structures being interconnected so as to

  put a movement of sliding between them to modify the interval between the stops while retaining

  the stops against tilting movements

  approximately horizontal axes, in the set

  ble perpendicular to the direction of the movement of cou-

  smoothing, during the clamping of a part between them while they are mounted on the clamping mechanism

  and during the actuation of the control means of the

  tau. According to another aspect of the present invention, an accessory for a clamping mechanism incorporating a structure constituted by a vice formed by a pair of vice members having vice control means for

  pull them close together and push them away

  of each other in an approximately hori-

  zontal, the vice members having clamping faces arranged opposite and the structure being such that a part extending over the entire length of the vice members and clamped by the clamping faces opposite may extend only to a limited depth between the vice members and a number of holes or recesses

  extending upwards opening into the upper surface

  of each vice member, the accessory comprising a pair of stops designed to exert a clamping force against a workpiece, stops which, when mounted on the clamping mechanism, have opposite clamping faces located at a greater height than that of the vice members to allow the part which is clamped between the clamping faces vis-à-vis

  stops to extend to a greater depth

  deur below the clamping faces of the accessory that

  the depth to which the part could extend

  dre below the clamping faces of the clamping mechanism

  rage if it was clamped between the pair of vice members; this accessory comprises a pair of interconnected structures each comprising one of the stops and a base part which comprises at least one lug extending downwards designed to be received in one of the holes or

  recesses extending upward from the clamping mechanism

  ge, the structures being interconnected so as to allow a sliding movement between them to modify the interval between the stops while retaining

  the stops against tilting movements

  approximately horizontal axes, in the set

  ble perpendicular to the sliding movement,

  during the clamping of a part between them while they

  are mounted on the clamping mechanism and during access

  operation of the vice control means.

  According to yet another embodiment, a workbench comprises a pair of elongated vice members, one of the vice members being mounted so as to be able to move in approach and away from the other vice member either in a parallel fashion or in a manner that allows one end of the movable vice member to be pulled closer to the other member

  vice than the other end, each vice member has

  bearing a number of holes or recesses which

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  plug in its upper surface, and an accessory carried on the vice organs comprising a pair of interconnected structures each comprising a stop designed to exert a clamping force against a workpiece at a level situated above the surface of the organs vice and a base portion which has at least one downwardly extending lug adapted to be received in one of the holes or recesses extending upwardly of the vise members, a lug being received in a hole or recess of one of the vice members and the other lug being received in a hole or recess of the other vice member, the two structures being interconnected so as to allow a sliding movement between them to modify the interval between the stops while retaining the stops against movements

  tilting around horizontal axes during service

  rage of a part between them and during actuation

vice control members.

  According to another aspect of the present invention, a workbench having a top structure constituted by a vice comprises a pair of elongated vice members, one of the vice members being mounted so as to be able to move in approach and away from the other vice member either in a parallel manner or in a manner that allows one end of the movable vice member to be pulled closer to the other member

  vice than the other end, each vice member has

  bearing a number of holes or recesses which

  plug in its upper surface, and an accessory according to the present invention in which the two supports

  of jaw or interconnected structures are attached

  pleated to the respective vise members by the fact that the downwardly extending lugs are inserted into the upwardly extending holes or recesses of the vise members

respective.

  According to another aspect of the present invention,

  an accessory for a clamping mechanism of the special type

  cified comprises a pair of cooperating structures, each

  any of the structures comprising an approximate organ-

  L-shaped having a portion which extends appr-

  ximatively horizontally and a part which extends upwards comprising a stop designed to exert

  a clamping force against a workpiece, each of the struc-

  tures having a base portion which has at least one downwardly extending lug, the base portion being

  located in the region where the organ approximately hori -

  zontal and the upwardly extending member meet, and each of the pins to be received in a different upwardly extending hole or recess of the clamping mechanism, each of the base portions having a surface

  downward facing and each member extends

  approximately horizontally having a surface

  support oriented upwards, each of the organs extends

  horizontally being arranged so as to extend on: the same length as the other, so that a

  upward facing support surface of each of the

  ganes extending approximately horizontally cooperates with the downward facing support surface of the other

  structure to allow sliding movement

  between the structures to modify the interval between the stops while retaining the stops against rocking movements around axes approximately

  horizontal, generally perpendicular to the direction

  tion of the sliding movement, during the clamping of a part between them while they are mounted on the clamping mechanism and during actuation

means for controlling the vice.

  According to another aspect of the present invention,

  an accessory for a clamping mechanism of the special type

  Fié has a pair of structures and an extended bar

  between the structures, each of the structures

  taking an upwardly extending member which includes a stopper and a base portion which comprises a downwardly extending lug, each of these lugs to be received in a hole or recess extending upward different from the clamping mechanism, each of the structures having an upwardly facing bearing surface and

  a downward-facing support surface and the bar

  bearing a downward facing bearing surface and an upward facing bearing surface in the region of

  each of the two structures, the bearing surfaces orient-

  downward tees formed on each of the structures being more spaced from each other than their upwardly facing bearing surfaces such that the upwardly facing and downwardly facing bearing surfaces

  formed at both ends of the bar act respec-

  tively against the downward facing bearing surface and against the upward facing bearing surface of each of the structures so as to allow movement

  sliding between the structures to modify the inter-

  valley between the stops while retaining the stops at the

  against tilting movements around appropriate axes

  ximatively horizontal, generally perpendicular to the direction of sliding movement, during

  clamping of a part between them while they are being

  clamps on the clamping mechanism and during actuation

vice control means.

  The invention can be implemented in numerous

  its different ways but will be described below by way of example several specific embodiments with reference to the accompanying drawings in which: Figure 1 shows a pair of accessories according to the invention mounted on a workbench and used to clamp a sheet shown schematically; Figure 2 is a perspective view of another form of the accessory; Figure 3 is a side elevational view in partial section of the embodiment of Figure 2; Figure 4 is a perspective view of another embodiment; Figure 5 is a perspective view of another embodiment; Figure 6 is a perspective view of another embodiment; Figure 7 is a perspective view of another embodiment; Figure 8 is an end elevation view

  of an embodiment in which the part is held

  naked by a strap; Figure 9 is a view similar to that of Figure 8 but which shows a part which is supported downwards by a belt;

  Figure 10 is a perspective view from

  another embodiment; Figure 11 is a perspective view of another embodiment;

  Figures 1 l A and 11 B show two forms

  my different of jaw faces designed court to be used with the accessory of figure II instead

  of the jaw face shown there.

  Figure 1 shows the top structure

  a workbench that has a pair of extended vise members

  ages 10 and 12, the first of which is rigidly attached

  to a pair of transverse supports 14 and 16 The sup-

  transverse ports 14 and 16 have horizontal guide surfaces 18 on which the member is mounted,

  so as to rest on them during a sliding movement

  sement in approach and away from the fixed vice member 10 This movement of the vice member 12 is caused by the actuation of one or two cranks of a pair of vice cranks 20 each of which is mounted at the end of a respective threaded rod 22 extending horizontally which is journalled in the front end of the transverse support 14 or 16

  corresnondant Each vris carries a Nut 24 which is

  similar to the underside of the movable vice member 12 by a pivot extending vertically This allows the independent actuation of the two vice cranks 20 of

  the manner described in British Patent No: 1,267,032.

  Thus, the vice member 12 Can be moved in such a way that its vice face 30 remains parallel to the corresponding face of the fixed vice member 10, that is to say

  by employing a smooth and simultaneous speed

  alternatively 20, by actuating a single hand

  or by operating the cranks at different speeds, the vice member 12 can be positioned

  obliquely to the vice member 10.

  Each vice member 10 and 12 comprises a ring

  any number of expanding holes or bores 32 - ertica-

  The elements described up to this point represent a workbench of a well-known type sold under the brand.

WORKMATE.

  In the drawing, there is shown mounted on the shelf

  bli a pair of accessories according to the present invention.

  Each has a jaw structure with two parts

  hooks 40 extending upwards, both

  provided with teeth 42 on their inwardly facing surface

  Each attachment part 40 is formed in one piece with a coupling part 44, two

  -coupling parts being positioned in an arrangement

  face to face and each having a circular base

  laire 46 Each base 46 has a lug 28 extending downwards These lugs extend (with a free adjustment) through the bores 32 for maés dan <the organs

* vice 10 and 12.

  Each one? in c uplage parts 4, -: ncnprte an elongated horizontal slot 50 and, in each slot, is

  arranged the rod of a bolt 52 which extends transversely

  from the lower end of the part

  hook 40 extending upwards from the other mast

  each bolt 52 has a head which is larger than the width of the slot with which it cooperates and the bolt is tightened so that the two structures are

  jaw res are capable of free movement

  sliding to change the distance between their teeth 42 In other words, the jaws are assembled by a pair of pin couplings and

slot.

  With the arrangement described and as shown

  in Figure 1, a log 60, shown schematically-

  can be positioned between the opposite teeth of

  each of the jaws if necessary after a widening

  ment of the interval between the teeth obtained by moving the associated vice member 12 backwards It will be understood that the displacement of the vice member 12 is transmitted to the rear hooking part 40 of each jaw by

  via lug 28 associated with the contact part

  spitting When a log is properly positioned

  between the jaws, we can then operate the cranks together or independently to pull the hooking parts

  back to front in order to apply a clamping load between the teeth of the two jaws It will be understood that the clamping action causes a reaction on the hooking parts 40 which tends to rotate them away from one of the other, that is to say that the right hooking part 40, in each case, will tend to rotate clockwise

  shows by considering figure 1 and that the part of

  spit on the left 40 will tend to turn in the opposite direction

  counterclockwise These trends in turn-

  They are, however, completely balanced by the presence of the pin and slot couplings since the left pin and slot coupling between the jaws opposes clockwise rotation

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  of a watch from the right hooking part 40 and that, likewise, the pin and slot coupling

  right opposes the counterclockwise rotation of the ai-

  guilles of a watch of the left hooking part 40 It follows that -2 each lug remains vertical and in

  full contact with the bore of the corresponding vice body

  laying in which it is received and thus the lugs

  have no tendency under the effect of the load

  centered produced by the screws, to damage the material

of the workbench.

  It should be noted that the coupling parts 44 have upper surfaces inclined in opposite directions. When the vice members are separated by the movement of the rear vice member towards the rear, the separation movement has the effect that the upper surfaces of the coupling parts bear against the underside of the cover 60 and push it upwards out of support with the teeth

42 of the attachment parts 40.

  The design of the embodiment of the fi-

  gure 1 allows a very robust construction

  bust capable of withstanding the considerable forces which

  occur as a result of tightening at a large distance

  tdnte spacing of the line of force of the screws 22.

  Another aspect of the first embodiment

  to which we must more particularly draw attention

  tion is that the two halves of each jaw are identical so that the realization of the tooling

  is an extremely simple operation.

  We will now refer to a second embodiment shown in Figures 2 and 3 which applies the same principles but includes certain

other features.

  Thus, a jaw is formed between two co-

  vertical rails 62 and 64 which, as will be described, can be moved closer and farther apart

  each other Each column has a cross-section

  dirty approximately square and is made from a tube and has five spaced circular holes 66 formed in the respective faces opposite 68 and 70 and in the respective faces facing outwards.

laughing 72 and 74 of the columns.

  Column 62 is formed in one piece with a horizontal rectangular tube 76 in each of the side faces of which an elongated slot is formed 78 Immediately, below column 62 is a single lug 80 designed to be able to freely engage in a bore 32 of a workbench such as that shown

in figure 1.

  The second column 64 is mounted on a stirrup 82 which has lateral flanges 84 each provided with a T-shaped slot 86 to cooperate with nipples 88 extending laterally from the sides of another

  rectangular tube 90 Two cylindrical rods 92 extend

  from one side to the other of the tube 90 pass through the two slots 78 of the tube 76, the latter tube being received with a sliding adjustment in the tube 90 The right end of the tube 90 has a single lug 94 which extends down from said tube and is designed to be received

  in one of the openings 32 of the vise members of the

  bli. Stops 100 having a general U or V shape provided with lugs 102 or flat stops 104 provided

  of a pair of spaced pins 106 are designed to cooperate

  rer with the holes 66 formed in columns 62 and 64.

  The stops 100 and 104 can be introduced into the openings 66 of the columns 62 and 64 either in the facing faces thereof or in their faces facing outwards, in which case the stops can be

  oriented in the direction of mutual distance for

  to engage the interior surface of a drum, for example

example.

  With the construction shown in FIGS. 2 and 3, it is possible to clamp pieces between the columns using appropriate stops to correspond to the needs of the pieces. The spacing between the columns can be made precisely by means of the cranks.

  bench vise but if the spacing between the colon-

  nes can not be adjusted appropriately to the required width, due to the insufficient length of the screws 22, one can roughly adjust the position of the column 64 relative to the tube 90 by releasing the

  slots 86 of nipples 88, lifting the column above

  above the tube 90 and by realigning the column 64 with a different pair of nipples 88 This allows the device of FIGS. 2 and 3 to be used to clamp very large pieces which could not normally be clamped in the space between the vise members 10 and 12 of the workbench Another adjustment of the spacing between the columns 62 and 64 can, of course, be obtained by introducing the lugs 80 and 84 into openings 32

different from the workbench.

  FIG. 4 represents a third mode of reaction

  reading which is essentially of the same type as that of Figures 2 and 3 but which does not use a pin and slot coupling; instead, the dimensions of the outer surfaces of the tube 76 and the inner surfaces of the tube 90 are determined such that the tubes

  fit closely together and can suppress

  carry the loads applied during ser 3, e.

  As in the case of the first embodiment, the loads of syringe in one and the other of the second and third embodiments produce similar off-center loads on the lachoire, the column of

  right 62 arant tendincs to turn dens I feel ai-

  guilles dune showed and the left column 55 having terdance to turn in the opposite direction of the hands of a watch, the pin coupling and fent 3 u mode of

  realization of figures 2 and 3 and the tubular coupling

  laire of the embodiment of Figure 4 as well as the pin and slot couplings of the first embodiment

  realization absorb off-center loads by transmitting

  both the tendency to rotate by means of guide provided either by the pin and slot coupling or by the tubular coupling so that the columns have no tendency to rotate the lugs 80 and 94 either way that would cause damage to the workbench top or in a way that would cause insufficient grip due to linear contact while surface contact can otherwise be obtained

and maintained.

  FIG. 5 represents another embodiment.

  tion which has two jaw structures having cha-

  cune a horizontal rectangular plate 120, the plate

  being mounted with its large face extending vertically.

  Each plate 120 carries, at one end, a lug 122 designed to be able to be introduced into one of the openings

  formed in a vice member 124 or 125 of a workbench.

  Three T-shaped slots 128 are formed in the upper edge 126 of the plate to position the base of a stop, the base being designated by the reference

  general 130 and comprising a stirrup having lateral wings

  rails 132 and 134 and a horizontal wing 136 The base comprises a rod 138 extending transversely which is engaged in the slot 128 for positioning the base relative to the plate 120 The wing 136 carries an adjustment screw 140 by means of which we can do slightly

  pivot the base 130 around the rod 138 when it is desired

  re position the stop slightly obliquely A co-

  rectangular column 144 extends upwards from wing 136, this column being received in the end

  bottom of a tubular stop 146 which has a bore

  internal rectangular sage 148 Two opposite faces of the stop 146 carry an appropriate friction material 150 while openings 152 are formed in the two other faces to be able to receive either a stop 146

  having a general shape in V is a stop 156 to ali-

  automatic fitting which is provided with lateral flanges 158 and 160 designed to be positioned around the stop 146 and to be fixed there by means of a pin 162 which passes through openings 164 formed in the flanges 158

  and 160 and the openings 152 of the stop 146.

  Each plate 120 has an elongated horizontal slot through which extends a rod 172 carried by the interior face of the other plate 120, each rod 172 having a head 174 which serves to position the two plates one with respect to the other, so that the two structures formed by the plates constitute a

unified clamping mechanism.

  It should be noted that, in contrast to the previous embodiments, the lug 122 of each plate 120 is located at the opposite end from that where the stop 146 is located so that, in this case, to obtain a tightening movement between the stops, the vice member

  124 must be removed from the fixed vice member 125.

  On the left of Figure 5, there is shown another embodiment of a stop 180 which has two rows of teeth 182 intended for example to be

used to clamp logs.

  Figure 6 shows another embodiment.

  sation in which a clamping mechanism is formed by two identical structures plus a separate coupling bar Thus, each structure has an abutment face 200 rigidly mounted on a vertical plate 202 provided with a lug 204 at its lower end, this lug being designed to be introduced into an opening formed in a vice member 206 of a workbench as in the other embodiments The plate 202 is formed in one piece with an extension 208 extending forward of approximately triangular shape which carries on one of its sides a pin 210 with a head Another pin 212 with a head protrudes above the plate 202 on the same side as the pin 210 at a level situated slightly below the lower end of the stop 200, this other pin being spaced horizontally-

  vertically and vertically of the first pin 210.

  Both pins 210 and 212 have rod parts

  whose upper and lower surfaces respectively

  lower form support surfaces designed to abut against a rectangular bar 214 whose

  vertical width is approximately equal to the space

  cement between the abovementioned bearing surfaces.

  The two structures which include the stops, the lugs 204 and the pins with heads 210 and 212 have an identical shape except that one is left and the other right to position all the

pins on the same side.

  The operation of this mechanism is similar to that of the preceding embodiments. A part is placed between the two stops 200 and by actuating the twin screws of the workbench which carries the structures, the stops can be pulled towards each other. When the tightening takes place, any tendency of the faces of the stops 200 to tilt around longitudinal axes is prevented by the wedging of the bar 214 between the bearing faces

  facing up and down the rods of the gou-

  head pins 210 and, respectively, 212 which bear against the upper and lower faces of the bar 214 In this way, the rotational forces

  which tend to open the gap between the faces of bu-

  are canceled by the transfer of forces by the

  bar 214, as in the

  previous achievements In this case also, by cons

  sequent, good contact is maintained between the faces of

  stopper and the workpiece so as to ensure an excellent

  Rabies and the pins do not tend to tilt inside the bores of the vice members in which they are received and, consequently, they do not damage these bores. FIG. 7 represents an embodiment which presents similarities with the embodiment of FIG. 6 from which it differs in that it does not

  has only two cooperating structures Each has

  te a stopper 300 positioned on a vertical branch

  302 of an L-shaped plate having a horizontal branch-

  tale 304 Each structure comprises a lug 306 welded to the underside of the structure at the junction between the branches 302 and 304 and which engages in a bore formed in a vice member of a workbench as in the embodiments previous From each branch 302 extends iaterally, near its lower end, a pin 508 with head had a rod 310 The arrangement is such that the horizontal branch 304 of each structure has vertical and horizontal dimensions which positioned narrowly between each other

  lug 306 and the other pin 308 with head, as shown

  tee This positions the two structures relative to each other and positions the two branches 304 in contact with each other. In this way, the two structures are guided so that they can move horizontally, and, in this case also, as in

  the other embodiments, any tendency of the struc-

  tures to rotate around horizontal axes making the service

  rage is counter-square by 'support of the rods 3 d O of the

  piles 308 against the edges sunerleurs 312 of 5 horizontal branches 304, It will be understood that, in this mro (of r & ili-ation, the two structures Aont identical and nont mas need

to be straight and to buckle.

  Figure 8 represents S th-ma tic emfert an acces-

  evening similar to lalisht modes: we pra &; lastts in which two stops 400 'extending upwards c O omiprendent

  again coupling parts 402 extending horizontally

  highly formed in one piece with them provided with pin and slot couplings In this case, a piece, such as for example a tube 404, can be suspended at an appropriate clamping position by means

a belt 406.

  Figure 9 shows a similar embodiment in which a belt 408 is used to

  apply downwards a piece 410 between stops 412.

  * 10 Figure 10 represents another mode of realization

  which can be used to tighten ex-pieces

  very wide Figure 10 schematically shows a workbench having a fixed vice member 500 and a movable vice member 502, the latter being actuated by a pair of horizontally spaced vice control screws not shown Each clamping mechanism has a elongated round bar 504 which can be supported during the use of the clamping mechanism by any suitable support 506 Each clamping mechanism has a first stop 508 which extends upwards from an

  sleeve 510 provided with lower edges 512 by means of-

  which the stop 508 can be rigidly fixed at any desired position along the bar 504 The right end of each bar 504 is rigidly fixed to a

  another sleeve 511 to which a plate 516 is welded

  stretching horizontally which has a horizontal slot-

  elongated tale 520 The second stop 522 also includes

  ment, at its lower end, a sleeve 524 which

  is integral and another plate 518 extending horizontally-

  talement is welded to one face of the sleeve 524, this plate

  that also comprising an elongated horizontal slot 526 In the case of the slot 526, a pin 528 with a head extends from the sleeve 514 and in the case of the slot 520 a pin with a head extends from the

sleeve 524.

  The sleeves 514 have lugs 530 which are

  tending downward designed to engage in hazards

  vertical sages formed in the fixed vice organ 500 tan-

  say that the other sleeves 524 have lugs 532 extending downwards designed to engage in vertical bores in the movable vice member 502. The operation of this embodiment is essentially similar in principle to that previous embodiments Thus, the two sets of stops 508 and 522 can be pulled towards each other

  by actuating the vise screws of the workbench to move

  cer the movable vice member 502 In this case too, all the tendency of the stops 508 and 522 to rotate about longitudinal axes is transmitted by means of the clamping mechanisms and the pin and slot couplings which they behave at the other stop, thereby canceling

these rotational forces.

  Figure 11 shows an arrangement similar to that shown in Figure 6 in that a bar

  separate coupling extends between the jaws Access-

  evening comprises two identical or similar jaw structures, each of which is constituted by a jaw support 602 which comprises a lug 603 directed downwards, which is an integral part thereof, designed to be able to engage in an opening formed in one of the organs

  bench vise Each jaw support 602 includes

  te an elongated vertical slot 604 so that it can slide relative to a clamping load reaction bar 605 which extends over the entire width of the workbench in the same way as the bar 214 of the figure

  6 The jaw supports 602 are spaces one from the other

  be along the length of the bar 605 and the elements

  stop 606 preventing them from sliding beyond the

  bar mites Bar 605 is fitted with an

  temient sliding just in the slots 6 e O of the jaw supports so that the jaw supports are not able to rotate about an axis parallel to the axis

  607, i.e. a horizontal axis transverse to the long

bar 605.

  Each jaw support 602 carries a macho-

  re 608 pivotally mounted and the pivot consists of a pair of axes 609, one of which is mounted in each of two parallel jaw plates 611 one of which is disposed on each side of the jaw support 602 The axes 609

  pass through holes formed in plates 611 and

  in the slots 612 formed in the sides of the jaw support, the axes with heads which

position them transversely.

  Three cylindrical spacers 614 spa-

  each other are arranged between the side faces 611 of the jaw and the spacer

  614 lower can be positioned in any one

  that notches 615 of which a row is formed in the

  upper surface of the jaw support 602.

  You can see that you can make a rough adjustment of the position of the jaw along the jaw support by pivoting the jaw forward

  around pivot axes 609 to clear the workpiece

  placement 614 lower of its notch 615 then in

  sliding the pivot pins 609 along their slots 612 until you can tilt the

  jaws back by positioning the piece of space-

  ment 614 lower in the notch 615 chosen.

  A spring-loaded stop member 617 is mounted on the ex-

  of one of the jaw plates 611 and has a domed inner end which is pushed back by a

  spring in a position engaged in any one

  as depressions 618 from a series of such depressions formed above the slot 612 and each of which is disposed in a position which corresponds to one of the notches 615 so that when the coarse position

  of the jaw has been chosen, the stop element engages

  che in the corresponding depression and holds the male

  choir in place You can press a handle down

  cule 519 to withdraw the stop element 617 out of its depression 618 so that an adjustment can be made

  rude using only one hand.

  On one of the jaws 608 or on each of them is mounted a finger 670 workpiece support (of which only one has been shown in FIG. 11) Each finger 670 is pivotally mounted by means of an axis 671 on the side face of the respective jaw opposite to that which

  carries the tilting handle 619 and can be rotated

  counterclockwise around axis 671 of the active upright position shown on

  figure 131 in which it rests on a pair of er-

  gots 621 and protrudes horizontally inward towards the opposite jaw to a folded position (not shown) in which it hangs against the side of the jaw, spaced from the workspace between the pairs of jaws in opposite In its upright position, the finger 670 extends below a shorter jaw face, such as the face 626 or the face 629 which can be mounted at the top of the jaw 609 and of which it is pushed aside and used to carry a front piece

  that it is taken between the jaws opposite.

  Thus, the operator can place a heavy or inconveniently shaped part which must be clamped between the jaws opposite one another on the finger 670 of one of the jaws or on

  the fingers of the two jaws, the part thus being held

  naked by the finger or the fingers, the operator stabilizing the part with one hand while with the other mlin, it makes

  turn the cranks to grip the vice to bring the

  expensive the vice organs and the jaws 6 C 8 each

  others in order to tighten the part and then the jaws

  when it is not or when it is not necessary to support a piece in this way, the doijt or the fingers can or can be folded away from

1 space between the jaws.

  A jaw face 625 can simply be

  attached to the pairs of transverse positioning pins

  jaw accessory ment by means of pairs of windows

  tes 622 formed in spaced side walls 623 oriented towards the rear of the body of the jaw face. There may be a number of different jaw faces that can be mounted on the

  jaw pins 621 A flat face 625 has been shown

  shown in FIG. 11 FIG. 1 l A represents a face 626 which has a vertical pivot axis 627 between the front plate 626 A and the notched body 626 B so that the front plate 626 A can rotate around an axis

  vertical to body 626 B and jaw 608.

  A third possibility is shown in the figure

  11 B, this embodiment being designated by the ref-

  rence 629 and comprising a front plate 631 in the form of a V mounted on a horizontal pivot 632 The faces 626 and 629 shown in FIGS. 1 l A and 11 B can be

  both hooked to the positioning pins

  jaw stopper shown in Figure 11, by means of slots formed in spaced side walls

  extending backwards, in the same way as is

  chée the jaw face 625 of figure 11.

  You can easily mount the jaw assembly on a workbench using the two pins 603 and you can

  adjust the precise spacing between the two material supports

  choire using the cranks of the workbench which action-

hold the vice.

  Two of the complete sets of jaws of Figure 11 should be used mounted respectively on the opposite ends of the workbench so as to provide two pairs of coooperative jaws, each pair of which can be adjusted independently of the other by means of the crank workbench located at the end respectively

correspondent of the workbench.

  The jaws are raised from the position of ran-

AV 945

  gement shown in broken lines and designated by the reference 634 to the position shown in lines

  solid in which the front faces of the side plates

  Rales 611 are perpendicular to the bar 605 The jaws are then dragged to the coarse adjustment positions to allow the insertion of the part

  between them then we clamp them against the part in use

sant the cranks of the workbench.

Claims (32)

  1 An accessory for a clamping mechanism incorporating a structure constituted by a formed vice   by a pair of vice members having means of com   vice grip to pull them close and push them away from each other and a number of holes or recesses extending upwards opening through the upper surface of each vice member, this accessory comprising a pair of structures connected to each other each comprising a stop for applying a clamping force against a workpiece and a base part which comprises at least one downwardly extending lug designed to be received in one of the holes or recesses extending towards the   top of the clamping mechanism, this accessory being   characterized in that the structures (40, 44; 66, 64, 76,   ; 120, 130, 146, 156, 180; 200; 300, 304, 312;   400, 402; 516, 524, 522, 508; 602, 608, 611, 625) are interconnected so as to allow a sliding movement between them to modify the interval between the stops (40; 100, 104; 146, 156, 180; 200: 300; 400; 508 , 522; 608, 625, 626, 629) while retaining the stops against tilting movements   around approximately horizontal axes, in the   seems to be perpendicular to the direction of sliding movement, during the clamping of a part (60; 404) between them while they are mounted on the clamping mechanism and during the actuation of the means (10, 12,   , 22; 124, 125; 500, 502) for controlling the vice.   2 Accessory according to claim 1, character-   rised in that each structure comprises a coupling part (44; 76; 90; 402; 504, 514, 518) extending horizontally, the two coupling parts having at least one pin and slot coupling (50, 52; 86,   88; 78, 92; 516, 520, 526, 528) extending between them.   3 Accessory according to claim 2, capact- p % 7945   risé in that each coupling part comprises an elongated plate (44; 402) whose large surface extends vertically and which extends adjacent to, or in contact with, the other plate (44; 402).   4 Accessory according to claim 3, characterized in that each plate (44; 402) has a   elongated horizontal slot (50) through which extends   tightens a pin (52) attached to the other plate to react   read said pin and slot couplings.   5 Accessory according to claim 1, character-   rised in that each structure has a horizontally extending coupling part (304) which is an integral part of its respective base part from which it extends in the direction of the other base part, each base part having a downwardly facing bearing surface (310) abutting against an upwardly facing bearing surface (312) of the other coupling portion.   6 accessory according to claim 1, character-   laughed at in that each basic part has a pair   support members (210, 212) vertically and horizontally   spaced apart, the upper support member (212) being oriented downwards and the lower support member (210)   being oriented upwards and in that a sliding bar   separate area (214) is arranged to extend ho-   horizontally between the basic parts and to be available   seated between the pair of a-opui end-plucked ormans.   7 Accessory according to one of the preceding revcriedicat-ions, characterized in that each stop (100, 104; 150; 608) can be separated from its base part (130, 602).   8 Accessory according to the Lure of the preceding illustrations, characterized in that each stop (146,) has several stop faces 15 o, 154, 182) and can be adjusted in different orientations relative to the base wax in order to have the ^ 794 5   Stop faces different from the stop face to face.   9 Accessory according to one of claims   previous, characterized in that each stop has part hooking teeth (182) arranged opposite the other stop.   Accessory according to claim 2, charac-   characterized in that each structure comprises at least one part (44) extending horizontally which comprises a ramped surface arranged to push the part towards the   high when separating the stops (40).   11 Accessory according to one of claims   above, characterized in that each structure is identical to the other (40, 44; 120, 130; 300, 304, 312; 400, 402, 412; 602, 608, 611, 625).   12 Accessory according to claim 1, character-   risé in that each structure comprises a coupling part extending horizontally, the two coupling parts being constituted by telescopic tubes (76, 90).   13 Accessory according to one of claims   above, characterized in that at least one of the stops (64; 148; 608) can be roughly adjusted relative to the lug (94; 122; 603) of the   corresponding structure which carries it.   14 Accessory according to claim 1, character-   laughed in that it comprises a pair of jaw supports (90; 130; 602) each having a jaw (64, 148; 608)   which forms one of the stops and a basic part which   carries at least one of the lugs (94; 122; 603) extending downward, at least one of the jaws (64; 148; 608) being capable of being positioned on its support in a position chosen from a number of defined positions.   Accessory according to claim 14, character-   laughed at in that each jaw is mounted on its support   through at least one coupling per gou-   7945 plunder (609) and slot (612), the latter extending   in the sense of the width of the gap.   16 Accessory according to claim 15, charac-   terized in that the supports are connected together by a beam (605) which extends in the width direction of the interval.   17 Accessory according to claim 16, charac-   terized in that at least one support (608) can slide relative to the beam (605) but cannot rotate   away from the other support around a horizontal axis   zontal perpendicular to the length of the beam.   18 Accessory according to one of claims   14 to 17, characterized in that at least one support of ma-   choire has an alignment of teeth or ar-   rêt (615) and in that its jaw (608) has an or-   gane (614) capable of positioning itself against one of the   stops chosen in each of the defined positions.   19 Accessory according to claim 18, charac-   terrified in that the movement of the jaw between two   defined positions is obtained by rotating the   choir (608) relative to the support, by sliding the jaw then by rotating it in the opposite direction   against a new stop element (615).   Accessory according to one of the claims   14 to 19, characterized in that it includes spring means (617, 619), manually unlockable, for positioning the jaw (608) in any one of the defined positions.   21 Accessory according to one of claims   14 to 20 ,; Characterized in that it comprises one or more   separable jaw faces (625, 626, 629).   22 Accessory according to one of claims   14 to 21, characterized in that one of the jaws or each of the jaws carries a movable support member (670) which can be moved between an active position in which it extends approximately horizontally in   the space between said jaw and the oppo-   of the accessory and is thus carried by said jaw   re so as to be able to support a load which rests on it and a retracted position in which it is moved away from the space formed between the opposing jaws.   23 Accessory according to claim 22, charac-   terized in that the support organ or each organ of   support (670) is pivotally mounted (axis 671) on the clamp   re so that it can rotate around a pivot axis   horizontal transverse to the direction of sliding movement of the jaw supports and in that, when it has been rotated to its active horizontal position, said support member rests on a stop (621) of the jaw.   24 An accessory for a bench type   bearing a top structure constituted by a vice formed by a pair of elongated vice members having vice control means for pulling them in approach and pushing them away from each other and a certain number of holes or recesses extending towards the   high opening into the upper surface of each gold-   vice gane, this accessory being characterized in that it comprises a pair of structures (40, 44) comprising stops having toothed parts (42) extending towards the   top arranged face to face, a base part (46) pre-   view on each structure and provided with at least one downwardly extending lug designed to be received in one of the holes or recesses (32) of the workbench and of the coupling parts (44), one provided on each structure, which overlap and which have a horizontal slot (50) formed in each coupling part in which is engaged a pin (52) fixed to the other part of   coupling so as to allow a sliding movement   between the structures to modify the interval between the stops and to retain the stops against tilting movements around horizontal axes during the clamping of a part (60) between them while   that they are mounted on the workbench and during the action-   means of the vice control means (10, 12, 20, 22).   An accessory for a workbench of the type comprising a top structure constituted by a vice formed by a pair of elongated vice members having vice control means for pulling them in towards and pushing them away from the one from the other and a number of upwardly extending holes or recesses opening into the upper surface of each vice member, this accessory being characterized in that it comprises a pair of structures (120, 130) each of which   has a horizontal bar (120) having, at one end   mite, a downwardly extending lug (122) adapted to be received in one of the holes or recesses extending upward from the workbench and, at the other end, a stop (146) extending upward designed to exercise   a clamping force against a workpiece, each bar   carrying an elongated horizontal slot (170) in which a pin (172) carried by the other bar is received,   so as to keep the two bars in a relative   tion of parallel sliding and retaining the stops against tilting movements around horizontal axes during the clamping of the workpiece while the accessory is mounted on the workbench and during   actuation of the vice control means.   26 Accessory according to one of claims   previous, characterized in that each stop (130, 143) is mounted so as to be able to move around a horizontal axis relative to the associated lug (122) by means of an adjustment mechanism (140) which positions rigidly the stopper by approaching the lug at different inclinations. 27 An accessory for a clamping mechanism incorporating a structure constituted by a formed vice   by a pair of vice members having means of com   vice grip to pull them in and out   pushing away from each other and a number of upwardly extending holes or recesses opening through the upper surface of each vice member, this accessory comprising a pair of jaw supports each having a jaw designed to exert a clamping force against a workpiece and   a base part which comprises at least one lug extending   downwardly designed to be received in one of the holes or recesses extending upwards of the clamping mechanism, this accessory being characterized in that the supports are interconnected so as to allow   sliding movement between them to change the   tervalle between the jaws while retaining the jaws   res against tilting movements away from-   of each other around horizontal axes perpendicular   at the length of the gap during the clamping of a piece between them while they are mounted on the clamping mechanism and during the actuation of the vice control means, at least one of the jaws ( 64; 148; 608) being capable of being positioned on its support in a position chosen from a certain number of defined positions.   28 An accessory for a clamping mechanism incorporating a structure constituted by a formed vice   by a pair of vice members having means of com   vice grip to pull them in and out   push away from each other in a plane   approximately horizontal, the vice members having clamping faces arranged opposite a limited depth, and a certain number of holes or recesses   extending upwards opening into the upper surface   of each vice member, this accessory being characterized in that it comprises a pair of stops   (40; 100, 104; 146, 156, 180; 200; 300; 400; 508; % 7945   522; 608, 625, 626, 629) designed to exert force   clamping against a workpiece (60; 404), stops which   have opposite clamping faces having a higher   greater depth than that of the vice organs,   evening comprising a pair of structures (40, 44; 66,   64, 76, 90; 120, 130, 146, 156, 180; 200; 300, 304,   312; 400, 402; 516, 524, 522, 508; 602, 608, 611, 625)   interconnected, each comprising one of the stops and a base part which comprises at least one lug (28; 80, 94; 122; 204; 306; 530, 532; 603) extending towards   the bottom designed to be received in one of the holes or hollow out   elements extending upwards from the clamping mechanism (10, 12, 20, 22; 124, 125; 500, 502) the structures   being interconnected so as to allow movement   sliding between them to modify the inter-   valley between the stops while retaining the stops at the   against a tilting movement around appropriate axes   ximatively horizontal, generally perpendicular to the direction of sliding movement, during   clamping of a part between them while they are being   clamps on the clamping mechanism and during actuation means for controlling the vice.   29 An accessory for a clamping mechanism incorporating a structure constituted by a formed vice   by a pair of vice members having means of com   vice grip to pull them in and out   push away from each other in an appro-   ximatively horizontal, the vice members having clamping faces arranged opposite and the structure t being such that a part extending over the entire length of the vice members and clamped by the clamping faces in vis-à-vis can only extend to a limited depth between the vice members and a number of holes or recesses extending upward opening into the upper surface of each vice member, this accessory being characterized in that it comprises a pair of stops (40; 100, 104; 146, 156, 180, 200; 300; 400; 508, 522; 608, 625, 626, 629) designed to exert a force of clamping against a workpiece (60; 404) stops which, when mounted on the clamping mechanism, have opposite clamping faces located at a greater height than that of the vice members, to allow the workpiece which is clamped between the clamping faces opposite the stops to extend to a greater depth below the faces s   accessory clamping depth to   which part could extend below the clamping faces of the clamping mechanism if it was tightened   between the pair of clamps, the accessory   taking a jaire of structures (40, 44; 66, 64, 76,   90; 120, 12 Y, 146, 156, 180; 200; 300, 304, 312;   400, 402; 516, 524, 522, 508; 602, 608, 611, 625) re-   linked together, each comprising one of the stops and a base part which comprises at least one lug (28;, 94; 122; 204; 306; 530, 532; 603) extending downwards designed to be received in one of the holes or   recesses extending upwards from the clamping mechanism   rage, the structures being interconnected so as to allow a sliding movement between them to modify the interval between the stops while   retaining the stops against downward movements   bearing around approximately horizontal axes,   generally perpendicular to the sliding movement   When clamping a workpiece between them,   say that they are mounted on the clamping mechanism and during the actuation of the means (10, 12, 20, 22; 124, ; 500, 502) for controlling the vice.   An accessory for a tightening mechanism incorporating a structure constituted by a formed vice   by a pair of vice members having means of com   vice grip to pull them in and out   push away from each other and a certain '7945   number of upwardly extending holes or recesses opening through the upper surface of each vice member, this accessory being characterized in that it comprises a pair of cooperating structures, each of the structures comprising a member approximately in L shape having a portion (44; 304, 402) which extends approximately horizontally and a   upwardly extending portion (40; 302; 400)   as a stop designed to exert a clamping force against a workpiece, each of the structures having a base part (46) which comprises at least one lug (28; 306) extending downwards, the base part being located in the region where the approximately horizontal member and the upwardly extending member meet, and   each of the pins to be received in a hole or evi-   dement extending upwards different from the clamping mechanism, each of the base parts having a support surface (52; 310) oriented downwards and each of the members extending approximately horizontally having a support surface (50 ; 312) oriented upwards, each of the horizontally extending members being arranged to extend over the same length   than the other, so that an orienting surface   upward of each of the organs extending appro-   xinrtentially horizontally cooperates with the downward-facing support surface of the other structure so as to allow a sliding movement between the structures to modify the interval between the stops while retaining the stops against movements   tilting around approximate horizontal axes-   rate, in the set perpendicular to the direction of the coilisseent movement, during the serraae of a piece between them while they are mrontées siy e mécauisne   of tightening e L during actuation of these numbers does not of vice.   31 An accessory for a tightening mechanism C 7945   incorporating a structure constituted by a formed vice   by a pair of vice members having means of com   vice grip to pull them in and out   push away from each other and a number of upwardly extending holes or recesses opening through the upper surface of each vice member, this accessory being characterized in that it comprises a pair of structures and a bar extending between the structures, each of the structures comprising an upwardly extending member (200) which has a stopper and a base portion which comprises a downwardly extending lug (204), each of these pins to be received in a hole or recess extending upwards different from the clamping mechanism, each of the structures comprising a bearing surface; 210)   oriented upwards and a bearing surface (212) orientated   down, and the bar with a surface   then oriented downwards and a bearing surface (214) oriented upwards in the region of each of the two structures, the bearing surfaces oriented downwards   formed on each of the structures being more spa-   each other that their upwardly facing bearing surfaces such that the upwardly facing downwardly facing bearing surfaces formed at both ends of the bar act respectively against the bearing surface facing down and against the upward facing bearing surface of each of the structures so as to allow sliding movement between   structures to change the interval between the bu-   tees while retaining the stops against movement   tilting elements around axes approximately   horizontal, generally perpendicular to the direction   tion of the sliding movement, during the clamping of a part between them while they are mounted on the clamping mechanism and during the actuation of the vice control means. 250, 945   32 A workbench comprising a top structure constituted by a vice comprising a pair of elongated vice members, one of the vice members being mounted   so that you can move closer and further   the other vice member either in a parallel way or in a way that allows one of the ends   of the movable vise organ to be pulled over Drès from the-   be a vice member than its other end, each vice member having a certain number of holes or recesses which open in its upper surface, this workbench being characterized in that the vice members carry an accessory which comprises a pair of structures (40,   44; 66, 64, 76, 90; 120, 130, 146, 156, 180; 200;   300, 304, 312; 400, 402; 516, 524, 522, 508; 602, 608,   611, 625) interconnected each having a stop (40; 100, 104; 146, i 56, 180; 200; 300; 400; 508, 522; 608, 625, 626, 629) designed to exert a clamping force against a piece e; 404) at a level above the surface of the vice members and a base part which comprises at least one lug (28: 80, 94; 122; 204; 306; 530, 532; 603) extending downwardly designed to be received in one of the holes or recesses, extending upwards of the vice members, a lug being received in a hole or recess of one of the members   vice and the other lug being received in a hole or hollow   ment of the other vice member, the two structures being interconnected so as to allow a sliding movement between them to modify the interval between the stops while retaining the stops against   tilting movements around horizontal axes   during the clamping of a part between them and during the   operation of the vice control members (10, 12, 20, 22). 33 A workbench having a top structure constituted by a vice comprising a pair of elongated vice members, one of the vice members being mounted from d 7945   so that you can move closer and further   the other vice member is either in a   either in a way that allows one of the   mites of the movable vice member to be drawn closer to the other vice member than its other end, each vice member having a certain number of holes or recesses which open in its upper surface, this   workbench characterized in that it comprises an access-   evening as claimed in one of claims 1   to 29 in which the two jaw supports, or struc-   * tures connected to each other, are coupled to the respective vice members by the fact that the pins extending downward are inserted into the holes or recesses   extending upward from the respective vise members.