EP1055487A1 - Pliers with parallel jaws - Google Patents

Abstract

The wrench has two parallel working jaws (3, 7) and two handles (1, 16) able to turn relative to each other, each firming a unit, pivoted to each other via a drive device, so that when the handles are turned, the working jaws move towards or away from each other. The second working jaw is on a slide (8) which can move on a rail (2) connected to the first working jaw.

Description

The present invention relates to pliers according to the claim 1.

Pliers with two parallel in each position of their swiveling handles Working jaws are well known. The object of the invention is to achieve this based, a parallel pliers with improved applications to accomplish.

The solution to the problem is set out in claim 1. Beneficial Embodiments of the invention can be found in the subclaims.

A pair of pliers according to the invention contains two parallel working jaws and two handles pivotable relative to each other, one of which is for Forming a first pliers unit with a first of the work jaws firmly and another to form a second pliers unit with one second of the work jaws articulated via a drive device are to the work jaws in when pivoting the handles to move towards or away from one direction of work, a rest position of the second forceps unit relative to the first Pliers unit can be preset in the working direction.

This presettability of the rest position of the second forceps unit the application of the Expand parallel pliers according to the invention, since now in with them enlarged objects can be processed in different sizes. To adjust the rest position of the second forceps unit relatively for the first forceps unit, both forceps units only need relative to each other to be postponed, with the help of suitable positioning equipment can take place, which are connected to the pliers. The relative shift both pliers units take place in the working direction, i.e. in the direction in which the parallel work jaws are located are moved towards or away from each other.

According to an advantageous embodiment of the invention, the second work jaw is seated on a sled that slides on one with the first Working jaw connected rail is slidable. This will, on the one hand ensures a good parallel movement of the work jaws to each other and on the other hand a good relative shift of both Pliers in the working direction to each other.

In yet another embodiment of the invention, the drive device is also guided along the rail, making it easier and more reliable Pliers assembly is obtained.

For example, at least one toggle lever can be used as the drive device be one in the jaws when pivoting the handles to obtain the required pressing force between the work jaws. Instead of the at least one toggle lever, other drive devices can also be used be used, possibly in combination with a toggle lever, such as a pneumatic or an electric drive device.

When using a drive device designed as a toggle lever can an articulated axis of the toggle lever in a working direction extending longitudinal slot of the rail on which the first work jaw sits. This ensures a safe parallel guidance of the drive device ensured in the working direction and thus a corresponding Movement of the second forceps unit relative to the first forceps unit.

The joint axis guided in the longitudinal slot can be the one that closest to the handle connected to the drive device lies.

For moving the pliers units relative to each other in the working direction adjusting means are provided, with the help of which in the longitudinal slot can move guided joint axis of the knee lever. To the positioning means belongs to a threaded rod that is only rotatably mounted in the longitudinal slot extends in the working direction, and on the one with a corresponding internal thread equipped and secured in the longitudinal slot against rotation Bearing block is guided, which serves to form the hinge axis. To This can be done on opposite sides of the bearing block attached stub axles.

By rotating the threaded rod, the bearing block can therefore be in its Longitudinal direction and thus shift in the working direction, resulting in the corresponding Take along the entire toggle lever, the second work jaw and the handle connected to the drive device Pliers leads to the relative displacement of the second pliers unit relative to the first pliers unit. The actuating means thus have a relative simple construction on.

Here is an articulation axis closest to the second work jaw Toggle lever connected to the carriage carrying the second working jaw, which further simplifies the overall structure of the pliers.

According to an additional development of the pliers according to the invention a central joint axis of the toggle lever carries one with an adjusting lever firmly connected eccentric, which is inserted in a side and in the slide Groove engages with a closed face and against this face is feasible. By turning the eccentric accordingly the actuation of the control lever can be achieved that the toggle lever when closing the handles of the pliers or when closing the pliers mouth either blocked in a position where the knee lever is still is not fully stretched, or is blocked in a position where the knee lever has passed the extended position. In the first case the jaws of the pliers can move away from the handles open yourself, while in the latter case the knee lever directly from Hand must be applied to lead it out of the blocking position. This can be done, for example, by a suitable rotation of the Eccentrically connected control lever.

According to a further embodiment of the invention, each of the front pliers end pointing ends of slide and rail holding means have for detachable attachment of other tool parts. There Slide and rail are moved relative to each other when the Pliers handles can be operated, so that with sledges and Rail relative to tool parts connected at their respective free ends are moved towards each other, whereby one connected to the pliers Additional device can be operated. This additional device can for example a riveting device for blind rivets. It is formed approximately from a cylindrical clamping device held on the rail to clamp a rivet pin and from a Clamping device sleeve-like surrounding support device on is attached to the front end of the sled and over the free end of the Clamping device can be moved out.

Figur 1 die geöffnete Zange in einer ersten Ruheposition;

Figur 2 eine Explosionsdarstellung der Zange;

Figur 3 die geschlossene Zange in der ersten Ruheposition;

Figur 4 die geschlossene Zange in der ersten Ruheposition bei verdrehtem Exzenter;

Figur 5 die geöffnete Zange in einer zweiten Ruheposition;

Figur 6 die geschlossene Zange in der zweiten Ruheposition; und

Figur 7 die geschlossene Zange in der zweiten Ruheposition bei verdrehtem Exzenter.

An embodiment of the pliers according to the invention is explained in detail below with reference to the drawing. Show it:

Figure 1, the open pliers in a first rest position;

Figure 2 is an exploded view of the pliers;

Figure 3 shows the closed pliers in the first rest position;

Figure 4 shows the closed pliers in the first rest position with the eccentric turned;

Figure 5 shows the open pliers in a second rest position;

Figure 6 shows the closed pliers in the second rest position; and

Figure 7 shows the closed pliers in the second rest position with the eccentric turned.

The structure of the parallel pliers according to the invention is initially intended below will be explained with reference to Figures 1 and 2.

According to Figures 1 and 2, the parallel pliers contain a first handle 1, which is firmly connected to a guide rail 2 on which a first Work jaws 3 is fixed. The guide rail 2 is flat Rail formed, on the lower longitudinal side of the first handle 1 is attached via a flange 4 projecting obliquely downwards. On the opposite long side of the guide rail 2 and on her The first working jaw is located at the end facing away from the first handle 1 3. It is U-shaped and stands with his from the front Pliers-end, groundbreaking surface perpendicular to the guide rail 2. Between the legs of the U-shaped first work jaw 3 is a tool part 5 can be used, such that its working surface 6 from points the front end of the pliers away. The guide rail 2 itself runs slightly oblique to the longitudinal direction of the first handle 1.

A second work jaw 7 sits firmly on a carriage 8, which in turn has a longitudinally extending slot 9 which for Recording the guide rail 2 is used. At the bottom end of the Slides 8 protrude webs 10 into the slot 9 without, however to touch. These webs 10 engage in on opposite sides of the Guide rail 2 located longitudinal grooves 11 and thus secure the The carriage 8 is held on the guide rail 2. The carriage 8 is thereby and with it the second working jaw 7 in the longitudinal direction of the guide rail 2 can be moved, i.e. in the working direction. The second work jaw 7 is vertical with its surface facing the first working jaw 3 to the guide rail 2, so that both surfaces facing each other the work jaws 3 and 7 run parallel to each other. The sledge 8 is of the front side opposite the first working jaw 3 Guide rail 2 can be pushed onto this. This also applies in the event that the first handle 1 is attached to the flange 4.

The second work jaw 7 is U-shaped and takes between his legs on a tool part 12, the work surface 13th assigns to the first work jaws 3 and parallel to the work surface 6 of the tool part 5 comes to rest. The tool parts 5, 12 can can be replaced by any other.

A is used to drive the carriage 8 along the guide rail 2 Toggle lever 14, which can also be referred to as a drive device.

The toggle lever 14 is constructed from links or levers lying in parallel, which take up the carriage 8 between them.

In particular, the toggle lever 14 consists of two parallel first links 15, with their end pointing away from the pliers mouth firmly with a second Handle 16 of the pliers are connected. Furthermore belong to the toggle 14 two second links 17, which are parallel to each other and with their end pointing to the jaws on different sides of the Carriage 8 are articulated. For this purpose the second limbs point 17 threaded openings 18 at their ends facing the pliers mouth on, are screwed into the screws 19, which are in blind holes 20 engage, which are in opposite sides of the carriage 8th are located. For the articulated connection of the first links 15 to the second Links 17 have the latter recesses 21 in the direction of the first Links 15 in which approaches 22 of the first links 15 pivotable are included. The recesses 21 thus form together with the approaches 22 a middle toggle joint. To the second Handle 16 facing ends of the first links 15 have these through tapped holes 23, into which screws 24 are screwed from the outside are with their free and unthreaded ends in mutually opposite blind holes 25 of a cuboid Bearing blocks 26 engage, which is between the first Links 15 is located. The bearing block 26 is thus around the ends of the Screws 24 are pivotable and have a lower bearing axis of the toggle lever 14 form. The upper bearing axis of the toggle lever 14 becomes corresponding Formed by the screws 19, which in the same way as that Screws 24 are formed.

The bearing block 26 itself is guided within a longitudinal slot 27 which is located in the guide rail 2 and extends in the working direction A, which is parallel to the longitudinal direction of the guide rail 2. Here the bearing block 26 can only slide in the longitudinal slot 27 and not there rotate. A threaded rod 28 is positioned within the longitudinal slot 27, which also extends in working direction A. This threaded rod 28 is suitably in the longitudinal direction within the Longitudinal slot 27 fixed, so can not move in the direction A. It can only rotate about its longitudinal axis. On the threaded rod 28 sits the bearing block 26, the threaded rod 28 a bearing bore 26 with the appropriate thread goes through. If the threaded rod 28 is rotated about its longitudinal axis, it moves the bearing block 26 in the longitudinal direction of the longitudinal slot 27 in one way or the other, depending on the direction of rotation of the threaded rod 28. The threaded rod points at its end pointing away from the pliers mouth 28 on a threaded section 29, which by a Bore 30 protrudes, which is in a web 31 at the lower end of the longitudinal slot 27 is located. By means of a locking ring 32 Threaded rod 28 secured against falling out of the longitudinal slot 27, a setting wheel 33 being firmly attached to the free end of section 29 is over which the threaded rod 28 can be rotated.

As can be seen further, is located on an outside of the carriage 8 a groove 34, which starts from the bottom of the carriage 8 to one top and the groove 34 closing end wall 35 extends. Here is the Groove 34 is convex relative to the blind hole opening 20. In the groove 34 engages an eccentric 36 which is in the form of a disc with a flattened Peripheral part is formed. On one side of the eccentric or Disk 36 is attached to a pin 37 carrying it through an opening 38 protrudes, which is in the neck 22 of the right lever arm member shown in Figure 2 15 is located. The eccentric 36 thus comes between the limbs 15 to lie and is stored in the opening 38 via the pin 37. The free end of the pin 37 is firmly connected to an adjusting lever 39, so that the eccentric 36 can be rotated via the adjusting lever 39. Depending on whether the eccentric disc 36 itself or with its flattened peripheral portion strikes against the end wall 35 of the groove 34, the toggle lever 14 not or stretched beyond 180 °, so that it is either assumes its non-blocking or blocking position. In the latter case, the pliers have a self-holding function on, which can be ended by turning the lever 39 again is that the central pivot axis of the toggle lever 14 again from the End wall 35 removed.

Additional pliers can be used with the pliers according to the invention are connected, in each case via the free ends of slides 8 and guide rail 2. For this purpose, the carriage 8 and Guide rails 2 at the front pliers end holding grooves 40 and 41, on which tool elements can be pushed. The holding grooves 40, 41 run perpendicular to the working direction A.

A support element 42 can thus be placed on the free end of the guide rail 2 be pushed on, which engages around the guide rail 2 and with approaches 42a engages in the holding grooves 40. The carrier element 42 is used for mounting a clamping device 43 for the pin 44 of a blind rivet 45. In the clamping device 43 are arranged clamping jaws, not shown, which clamp or hold the pin 44 when the clamping device 43 is to be withdrawn again from the pin 44. This is related with blind rivets generally known and should not be discussed here are explained.

In addition, a support device can be on the front end of the carriage 8 Slide on 46. The support device 46 also encompasses the front end of the carriage 8 and protrudes with lugs 46a in the grooves 41 in. A lies on the front end of the support device 46 Pressing element 47, wherein support device 46 and pressing element 47 the Carrier element 42 and the clamping device 43 surrounded sleeve. The pressing element 47 presses with his when closing the pliers mouth front end against the lower edge of a collar 48 of the blind rivet 45, while on the other hand the rivet pin 44 through the clamping device 43 is held. This ultimately leads to a riveting process in which the pin 44 separates from the head 49 of the blind rivet 45 after the Head 49 has deformed the upper edge of the collar 48 accordingly.

The mode of operation of the pliers according to the invention is described in more detail below are explained.

First, reference is made again to FIGS. 1 and 2. In Figure 1 the pliers are in the open state when they are spread apart Handles 1 and 16. The knee lift consisting of limbs 15 and 17 14 is not stretched and the work jaws 3 and 7 are in the Distance from each other. The jaws are open.

According to Figure 1, the first handle 1 and the firm form with it over the Guide rail 4 connected first work jaws 3 a first pliers unit Z1. In contrast, the second handle 16, the second work jaw 7, which sits on the carriage 8, and the toggle lever 14 a second Pliers unit Z2. Both pliers Z1, Z2 are relative to each other displaceable and are in a first relative position in Figure 1 to each other.

The pliers in FIG. 1 start from their open position Moving the handles 1 and 16 towards one another in their closed position in FIG Position transferred, so rotates with a fixed handle 1 second handle 16 counterclockwise around by the screws 24 axis formed. The same applies to the first toggle link 15. Since the bearing block 26 does not have its relative position in the longitudinal slot 27 changes, the bearing axis 24 also changes its position relative to the first Pliers unit Z1 not, which leads to the fact that the second link 17 of the Toggle lever clockwise around the one formed by the screws 19 Toggle lever axis rotates, at the same time this toggle lever axis In the direction is moved to the first working jaw 3 and the slide 8 takes along, since the free ends of the screws 19 in the blind holes 20 of the carriage 8 engage. The carriage 8 then becomes the second Work jaws 7 moved in the direction of the first work jaw 3.

During this closing process, the pliers run due to the movement of the limbs 15 and 17 of the eccentric 36 in the groove 34 to the top left in FIG. 1 and 3 and then strikes against the end wall 35 closing the groove 34.

If the adjusting lever 39 is in the position shown in FIGS. 1 and 3, there is still enough material of the eccentric 36 between pin 37 and end wall 35, thereby preventing the toggle lever 14 from having a Angle of 180 ° is pushed through. So the pliers can after relieving the handles 1 and 16 by themselves in the open State, which is possible with suitable return springs, which are not shown here for the sake of clarity.

In Figure 4, however, the situation is shown that the control lever 39 is rotated so is that the flattened peripheral portion of the eccentric 36 End wall 35 is opposite. In this case, the knee lever can be moved around Push through more than 180 ° with the pliers closed, so that now one Self-locking function of the pliers is realized. A pinched in the jaws The object remains trapped, even when the handles 1 and 16 are relieved. Only when the control lever 39 is turned clockwise around the central hinge axis 37, the self-holding function be ended, since now the eccentric 36 with her larger diameter strikes against the end wall 35 of the groove 34 and thus pushes the toggle lever 14 towards the starting position.

Figures 5 to 7 show the same movements of the pliers according to Figures 1, 3 and 4, but now the second pliers unit Z2 relative to the first pliers unit Z1 is shifted in the working direction A. The Working direction A, as already mentioned, runs in the direction of movement the work jaws 3 and 7 or parallel to the longitudinal slot 27 in the guide rail 2. The movements themselves should not be explained again be so that in the following only on the displacement of the relative position is entered between the pliers units Z1 and Z2.

If the pliers are in the closed position shown in FIG. 6, the setting wheel 33 is relatively freely accessible. This setting wheel 33 is stuck on the rod section 29, which in the direction of the pliers mouth in the threaded rod section 28 passes. Starting from the position in Figure 4 rotates the adjusting wheel 33, the bearing block 26 is in the direction of Forceps mouth moved on the threaded rod 28, as it is due to the Guide in the longitudinal slot 27 can not turn. When moving of the bearing block 26 within the longitudinal slot 27 towards the first Working jaws 3, the handle 16 is first taken along, since it is articulated via the screws 24 on the bearing block 26. Get picked up also the first link 15 and the second link 17 of the toggle lever 14 and thus the slide 8 and with it the second work jaw 7. The entire second pliers unit Z2 becomes relative in the working direction A. moved to the first tong unit Z1 when the adjusting wheel 33 rotates. This allows the mouth width to be adjusted.

The difference between Figures 6 and 7 is again to be seen in that in Figure 7 by pivoting the lever 39, the self-locking function the pliers are switched on. Here the flattened strikes now Circumferential part of the eccentric disk 36 against the end wall 35 of the groove 34. Compared to Figure 6 is the flattened peripheral part of the eccentric 36 rotated by 90 °.

Claims (12)

Pliers with two parallel work jaws (3, 7) and two relative to each other pivotable handles (1, 16), one of which (1) for education a first pliers unit (Z1) with a first (3) of the work jaws fixed and another (16) to form a second pliers unit (Z2) with a second (7) of the work jaws via a drive device (14) are articulated in order to pivot the handles (1, 16) the working jaws (3, 7) towards one another in a working direction (A) or move away from each other, a rest position of the second Pliers unit (Z2) relative to the first pliers unit (Z1) in the working direction (A) can be preset. Pliers according to claim 1, characterized in that the second work jaw (7) is seated on a slide (8) which is slidably displaceable on a rail (2) connected to the first work jaw (3). Pliers according to claim 2, characterized in that the drive device (14) is guided along the rail (2). Pliers according to claim 1, 2 or 3, characterized in that the drive device (14) contains at least one toggle lever. Pliers according to claim 4, characterized in that a hinge axis (24, 26) of the toggle lever (14) is guided in a longitudinal slot (27) of the rail (2) which extends in the working direction (A). Pliers according to claim 6, characterized in that the hinge axis (24, 26) guided in the longitudinal slot (27) is the one closest to the handle (16) connected to the drive device (14). Pliers according to claim 5 or 6, characterized by adjusting means (28, 33) for displacing the joint axis (24, 26) guided in the longitudinal slot (27). Pliers according to claim 7, characterized in that the adjusting means (28, 33) have a threaded rod (28) which is only rotatably mounted in the longitudinal slot (27) and extends in the working direction (A), and a corresponding one on the threaded rod (28) Bearing block (26) which is equipped with an internal thread and is secured in the longitudinal slot (27) and is used to form the joint axis (24, 26). Pliers according to one of claims 4 to 8, characterized in that a hinge axis (19) of the toggle lever (14) closest to the second working jaw (7) is connected to the slide (8) carrying the second working jaw (7). Pliers according to one of claims 4 to 9, characterized in that a central joint axis (21, 22) of the toggle lever (14) carries an eccentric (36) which is fixedly connected to an adjusting lever (39) and which extends into a lateral one in the slide (8). introduced groove (34) engages with closed end face (35) and can be guided against this end face (35). Pliers according to one of claims 2 to 10, characterized in that the ends of the slide (8) and rail (2) pointing towards the front end of the pliers each hold means (41, 40) for releasably fastening further tool parts (46, 47, 42, 43) exhibit. Pliers according to claim 11, characterized in that the tool parts form a riveting device for blind rivets with a cylindrical clamping device (43) held on the rail (2) for the clamping reception of a rivet pin (44) and with a supporting device (sleeve-like) surrounding the clamping device (43) 46, 47), which can be moved beyond the free end of the clamping device (43).

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