EP0516598B1 - Pliers with selective front and side introduction - Google Patents

Description

The present invention relates to pliers into which objects to be machined in a pair of punches can be inserted from at least two directions, and in particular to crimping pliers for attaching contact elements such as wire end ferrules or the like to electrical conductors.

Both pliers with side entry (i.e. in the direction perpendicular to the device plane) and pliers with front entry (front entry) are known. "Device level" is understood here to mean the level in which the handles of a pair of pliers are located and move, and in which the stamp also moves. "Front introduction" means an introduction of the processing object into the pair of punches from the front end of the device, in the device plane and in the longitudinal direction of the device body and / or the handles.

It has been found that about half of the users prefer one type and the other half prefer the other type, or that in about half of the applications the one type and in the other half the other type is preferred.

From another point of view, pliers can be divided into those with scissor-like mutual movement (pivoting movement) of the punches or jaws or the legs carrying them or the like, and those with vice-like (parallel) mutual movement of the links mentioned.

In DE-OS 29 28 117 a pair of scissors-type pliers is described with a pair of articulated links which have a rear handle part and a front leg part, as well as with a pair of flat, elongated work jaws also articulated, each of which extends rearward, beyond the articulation point Have extension.

The pair of jaws is articulated by means of one of the rear extensions on the outside of one of the leg parts in such a way that it can be rotated about an axis lying in the device plane, so that the entire pair of jaws can be pivoted out of the device plane.

To transmit the movement of the other leg part to the other jaw or its rearward extension, a drive rod is slidably arranged between the two parts mentioned, which goes through openings in the other leg part and in the extension of the other jaw.

The purpose of the rotatable arrangement of the pair of jaws is to considerably reduce the cost share in the storage of pliers, but the device does not allow a choice between front introduction in the sense of the definition given above and side introduction; the jaws only allow side entry.

The pair of jaws arranged on the outside of one leg part forms a structure which protrudes from the conventional outline of a pair of pliers and increases the dimensions of the device. The jaws, particularly in their pivoted-out position, cannot apply as much force to the processing object as if it were within a pair of legs. And vigorous loading is e.g. required when crimping certain contact elements.

GB-A 2 072 081 by the applicant describes a pair of pliers with side entry with a pair of handles extending in a device plane, a pair of leg members connected to the handles and being movable between a maximum distance and a minimum distance from one another and having a free end have an inner side facing the other leg member, and with a pair of cooperating stamp members which can be acted upon by the leg members and which are arranged on the inside of each of the leg members in the region of its free end. One of the leg members is pivotally connected by means of a spring-loaded pin. Each stamp member can be pivoted about a pivot axis running perpendicular to the device plane and an alignment element is provided in order to maintain the mutual parallel position of the two punch members.

In a catalog "Rema Press-Technik" published by Rema Lipprandt GmbH & Co KG, Bonn, press pliers of the vice type are shown, which have no leg parts and in which the punches are arranged in a bracket which is one in the Device level axis is rotatable. Pliers of this type enable the processing object to be acted upon vigorously and to be introduced from any lateral direction, but not from the front, as defined above.

The object of the present invention is to create a pair of pliers which optionally allows lateral or frontal insertion without noticeably larger dimensions and / or reduced load capacity compared to a comparable conventional pliers.

This enables the user to choose the more advantageous mode of operation from case to case without purchasing two different pliers, or e.g. to take with you to external assembly work.

This task is based on that of the attached patent claim 1 evidently solved, with advantageous further developments being included in the subclaims.

• Fig. 1A eine Seitenansicht der erfindungsgemässen Zange bei Einstellung für seitliche Einführung,
• Fig. 1B eine Seitenansicht der Zange gemäss Fig. 1 bei Einstellung für Fronteinführung,
• Fig. 2 in grösserem Mass-stab den Oberstempel der Zange gemäss Fig. 1 in etwas abgeänderter Ausführung,
• Fig. 3 im gleichen Mass-stab den zugehörigen Unterstempel,
• Fig. 4 in einem noch etwas grösseren Mass-stab einen Halter für die beiden Stempel in der Zange gemäss Fig. 1, und
• Fig. 5 eine Draufsicht im Mass-stab der Fig. 1 des vorderen Teiles der Zange gemäss Fig. 1.

The invention will now be explained in more detail with reference to the accompanying drawings, which relate to exemplary embodiments. Here shows

• 1A is a side view of the pliers according to the invention when set for lateral insertion,
• 1B is a side view of the pliers according to FIG. 1 with adjustment for front entry,
• 2 on a larger scale, the upper punch of the pliers according to FIG. 1 in a slightly modified version,
• 3 on the same scale the associated lower stamp,
• Fig. 4 on a somewhat larger scale a holder for the two punches in the pliers according to Fig. 1, and
• 5 shows a plan view on a scale of FIG. 1 of the front part of the pliers according to FIG. 1.

The pliers 1 according to FIG. 1 has two leg parts 12, 22 and two handles 11, 21, of which the leg part 12 and the handle 11 are combined to form a rigid device body 10, and the handle 21 can be pivoted to the one by means of a pin 23 independent leg member forming leg portion 22, or a rear extension portion 22 'thereof, is connected. The handles 11, 21 lie in a common plane, the drawing plane of FIG. 1, which is the device plane.

The leg member 22 is pivotally connected to the device body 10 by means of a spring-mounted pin 24, in a manner which is outside the scope of the present invention and is described in more detail, for example, in British Patent 2,072,081 mentioned at the beginning. The leg members 12, 22 can be moved between a position of maximum mutual distance and a position of minimum mutual distance.

According to the invention, a lower punch 32 or upper punch 42 are rotatable in the leg parts 12 and 22 about a common axis of rotation D (FIGS. 2 and 3) lying in the device plane, and at the same time pivotable about one perpendicular to the device plane Pivot axis S (Fig. 5) mounted.

(The designations "upper" or "lower" are to be understood purely conventionally for the convex or concave stamp, because the pliers can of course also be reversed).

The punch members 32 and 42 are arranged on the mutually facing inner sides of the leg parts 12, 22, in the region of the free ends of the leg parts.

The upper stamp 42 has a substantially square (FIG. 5) base plate 43, from one side (the lower one of FIG. 2) of which a convex stamp element 44 protrudes. A pivot pin 45 protrudes from the opposite (the upper) side of the base plate 43, which can be seen more clearly as the pivot pin 45 'in FIG. 2 and which serves for the rotatable mounting of the upper punch 42 in the leg member 22.

The lower punch 32 has a base plate 33 of the same shape, i.e. likewise essentially square, on the one side (the upper one in FIG. 3) of which a concave stamp element 34 corresponding to the stamp element 44 is arranged. On the opposite (the lower) side of the base plate 33, a pivot 35 protrudes, which is identical to the pivot 45 and can be seen more clearly as the pivot 35 'in FIG. 3; it serves for the rotatable mounting of the lower stamp 32 in the leg part 12. The lower and the upper stamp together form a pair of cooperating stamp members 32, 42.

An upper punch 42 'according to FIG. 2 has a convex stamp element 44' which is somewhat modified with respect to FIG. 1A and a pivot pin 45 'which has an axial threaded bore 45'b and four depressions 45'a on the circumference.

3, a lower punch 32 'according to the invention has a concave stamp element 34' corresponding to the convex stamp element 44 ', and a pivot pin 35' identical to the pivot pin 45 'with an axial threaded bore 35'b and four depressions 35'a on the circumference.

In the base plate 43, 43 'two cylindrical guide pins 46 and 46' are also embedded or anchored, which protrude on the same side as the convex stamp element 44 or 44 '. In the base plate 33 and 33 ', which is considerably thicker than the base plate 43 and 43', there are two receiving openings 33'a provided with the same cross-section for the guide pins 46, 46 '. The free length L of the guide pins 46, 46 'is selected such that the guide pins 46, 46' engage with one end part in the receiving openings 33'a even when the two punch members 33 ', 43' are at a maximum distance.

The length of the receiving openings 33'a is at least equal to the maximum mutual distance of the two punch members 33 ', 43' plus the length of the end part mentioned. The thickness B of the base plate 33 or 33 'must understandably correspond to the same condition, or it can possibly be greater, namely if the receiving openings 33'a are designed as blind holes.

This dimensioning means that the guide pins 46, 46 'can never leave the receiving openings 33'a with their free ends, but also can never protrude with their free ends from the opposite side of the base plate 33'. The latter circumstance could interfere with the setting of any rotational positions of the pair of punches.

The two guide pins 46, 46 'and the receiving openings 33'a, which are preferably arranged in the region of diagonally opposite and advantageously rounded corners such as 43a (FIG. 5) of the base plates 33, 33' and 43, 43 ', respectively a driver element, which ensures identical rotational position of the two punch members 32, 42 without impairing their mutual approach movement.

The entrainment member 33'a, 46 'also fulfills a second function, namely that of an aligning member, which ensures the mutually parallel position of the two punch members 32, 42 (in principle, of course, the entrainment and aligning function can also be provided by separate members).

The pliers 1, i.e. Both the device body 10 and the leg member 22 are produced in a manner known per se from two parallel side plates such as 22a, 22b (FIG. 5), which are formed by means of rivets such as 22 ″ and spacing elements such as 22 ″ a (FIG. 5 ) at a selected mutual distance, ie with an empty space Z (Fig. 5).

The pivots 35, 35 ', 45, 45' are in this space Z (and in the corresponding space in the leg part 12) rotatably mounted, with advantage by means of identical inserts 50, preferably made of plastic, according to FIG. 4.

The inserts 50 are essentially U-shaped, with two arm parts 50a, 50b, which are connected by a web part 50c, and have tapered free ends. Circular or cylindrical indentations 50a ', 50b' are provided in the inner sides of the arm parts 50a, 50b, the parts of a single cylindrical pivot bearing with a radius of curvature which is substantially equal to that of the cross-sectional area of the pivot pins 35, 35 ', 45, 45' , form.

The arm parts 50a, 50b also have on their outer sides, for example in the region of the indentations 50a ', 50b' in the inner sides, short stub axles 50a '', 50b '', the length of which is of the order of the thickness A (FIG. 5) Side plates 22a, 22b lies. Bearing openings 22a ', 12a' for the stub axles 50a '', 50b '' are provided in the side plates 22a, 22b. Analog openings are also provided in the side plates of the leg part 12. The stub axles 50a ″, 50b ″ represent the pivot axis S of the respective punch member 32 ′, 42 ′.

When assembling the device, the two inserts 50 are first inserted with their stub axles 50a ″, 50b ″ into the openings 12a ′, 22a ′ in the leg parts 12, 22 by slightly compressing their arm parts. For inlays 50 made of unyielding material such as Metal, which does not allow compression, is inserted before the other side plate is attached.

The pivot pins 35, 35 ', 45, 45', which embody the axis of rotation D of the punch members 32, 42, are then inserted into the bulges 50a ', 50b'.

The length of the pivot pin 35 etc. corresponds to the width G of the arm parts 50a, 50b of the insert 50. A washer 52 is fastened to the free end of the pivot pin 35 etc. by means of a screw 51 screwed into the axial threaded bore 35'b, 45'b . The outer diameter F of the washer 52 is smaller than the mutual distance C of the inner surfaces of the side plates, such as 22a, 22b, and larger than the mutual distance E of the inner surfaces of the arm parts 50a, 50b in the region of the Indentations 50a ', 50b'.

In the space between the pivot pin 35 etc. and the web part 50c there is a known locking element 53 in the insert 50 with a spring-loaded engagement element such as a ball or the like for engagement in each of the four recesses 35'a, 45'a in the pivot pin 35 ', 45' arranged.

The pair of punches 32, 42, 32 ', 42' can thus be transferred in any direction from the position according to FIG. 1A for the lateral introduction of a processing object into the position according to FIG. 1B for front introduction (and of course also in any intermediate position).

With pliers of the vice type, there is no need to pivot the punch members 32, 42, 32 ', 42' so that they can be rotatably supported directly in the leg parts.

Since the two punch members 32, 42, 32 ', 42' are connected by the driver member 33'a, 46 'for common rotation, it is sufficient if a snap-in member is provided only for one of the punch members. The latching element can also be used elsewhere, e.g. be arranged on the mutually facing surfaces of the leg parts and the base plates, and in principle the snap-in function can be omitted at all.

The driving element can also be designed differently, and e.g. consist of a single guide pin of non-circular cross-section and a corresponding receiving opening. The stamp members can have a plurality of stamp elements for processing objects of different sizes in a manner known per se.

The invention is of course also applicable to pliers where both leg parts are rigidly connected to the handles or where both leg parts are articulated to the handles.

Claims (9)

1. Pliers into which may be introduced objects to be treated in a pair of dies, comprising a pair of handles (11, 21) extending in a tool plane, a pair of leg members (12, 22) which are connected to the handles (11, 21) and are movable between a maximally spaced and a minimally mutual position and have a free end and an inner face turned toward the other leg member, and a pair of co-operating die members (32, 42), affectable by the leg members and provided on the inner side of each arm member in the region of its free end, each die member (32, 42) being pivotable about a pivot axis extending at right angles to the tool plane, an alignment means being provided to maintain the mutually parallel position of the two die members, characterized by the die members (32, 42) being rotatable about a rotational axis (D) lying in the tool plane and being, for securing their corresponding rotation about the said axis (D), provided with a carrier means (33'a, 46') consisting of two members and not affecting the relative movement of the leg members (12, 22), each member of the carrier means being mounted on one of the die members (32, 42) so that the die pair may be brought into a desired rotational position for the introduction of the object to be treated, inclusive of a position for frontal introduction and a position for lateral introduction.
2. The pliers of Claim 1, characterized by the carrier means (33'a, 46') being provided on one of the die members (33, 44) with at least one, and preferably with two diagonally juxtapposed guiding taps (46'), and on the other die member with a reception opening (33'a) for each guiding tap, in which opening the guiding tap projects with an end part of its free length (L) even at the maximal mutual spacement of the two die elements.
3. The pliers of Claim 2, characterized by the reception opening (33'a) having a length which at least corresponds to the maximal mutual spacement of the two die members (32', 42') plus the length of the end part of the guiding tap (46') which at this spacement projects into the reception opening (33'a), the die member (33') in which the reception opening (33'a) is located being provided with a base plate (33'a) having at least the same thickness (B), so that the guiding taps (46') neither can leave the reception opening (33'a) with their free ends, nor can protrude with their free ends from the reverse side of the base plate (33').
4. Pliers of the scissors type accordning to one of the preceding claims, characterized by the carrier means (33'a, 46') embodying at the same time also the alignment means.
5. The pliers of Claim 4, built up of two parallel side plates mounted with an interspacement, characterized by each die member (32, 42) being at its rear face provided with a protruding rotary tap (35', 45') which is rotatorily mounted in the respective leg members (12, 22) in the said interspace (Z).
6. The pliers of Claim 5, characterized by a U-shaped insert (50) for rotational and pivotable connection of the rotary tap (35', 45') with the leg members (12, 22), which insert is provided with two arm members (50A, 50B) connected by a bridge member (50C), a circular or cylindrical recess (50a', 50b') being provided in the inner face of both arm members (50a, 50b) so that the two recesses define together a cylindrical rotational bearing for the rotary tap (35', 45'), short axial stumps (50a'', 50b'') embodying said pivot axis (S) being provided on the outer faces of the arm members in the region of the said inserts (50a',50b'), corresponding openings (12a', 22a') being provided in the side plates (22a, 22b) for the accomodation of said axial stumps.
7. The pliers of Claim 6, characterized by axial threaded openings (35'b, 45'b) being provided in the rotary taps (35, 35', 45, 45') and the rotary taps (35', 45') being retained in the inserts (50) by washers (52) with an outer diameter (F) which is smaller than the mutual spacement (C) of the inner faces of the side plates (22a, 22b) and larger than the mutual spacement (E) of the inner faces of the arm members (50a, 50b) of the insert (50) in the recesses (50a', 50b').
8. Pliers according to one of the preceding claims, characterized by a click-in means for fixing a selected rotational position of the die pair (32, 42).
9. The pliers of Claim 8, characterized by the click-in means being defined by recesses (35'a, 45'a) on at least one of the rotary taps (35, 35', 45, 45') and by a spring-loaded click-in element engageable into these recesses.

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