EP2685573B1 - Crimping tool for turned contacts - Google Patents

Description

The present invention relates to a crimping tool for turned contacts on electrical conductors.

In the DE 10 2009 026 470 A1 a crimping tool for rotated contacts is described, in which a missing force-displacement compensator must be compensated by manually unlocking a pawl in the grip part of the pliers, after which the crimping die was crimped onto a conductor during crimping of a turned contact. In addition, the tool must be set exactly to the crimping cross section before crimping.

Due to the lack of force-displacement compensation device, therefore, the operation of the crimping tool is quite cumbersome. In addition, the diameter range of the turned contacts, which can be crimped with the crimping tool, limited. However, a crimping tool for turned contacts is desirable that has an automatically acting force-displacement compensation, so that the manual unlocking or adjusting the crimping tool is eliminated and also allows the crimping of turned contacts on conductors in the largest possible diameter range, so that the widest possible range of conductor cross-sections can be provided with turned contacts with a single crimping tool.

Generic crimping tools are known from the prior art, so from the DE 195 07 347 C1 , However, the power-path balancer needs improvement. The solution to this problem is the object of the invention.

DE 195 07 347 C1 discloses the preamble of claim 1.

The invention achieves the object by the subject matter of claim 1. Here, the first spring is structurally realized in each case by a part of the base plate, which is limited by an incision. It is advantageous that the first spring has substantially a geometry in the form of an arcuate, in particular a circular arc segment-shaped leaf spring.

The invention according to claim 1, further specified in the dependent claims, therefore, the idea is based on the advantageous effect of spring by the interaction of the springs to provide an increased force and an enlarged path for the force-way balance device to be created for the crimping tool , This ensures that contacts or conductors rotated with the crimping tool can be crimped with the largest possible diameter range.

In this case, it is further preferred if the incision runs substantially parallel to the outer contour of the base plate. To reduce the mechanical stress at the end point of the incision, the end point of the incision is preferably made rounded. The incision circulates in its contour advantageously the hinge pin and opens at the top of the handle from the base plate. The spring is thus preferably substantially each given a geometry in the form of an arcuate or kreisbogenabschnittsförmigen leaf spring. In order to realize a significant travel, the incision is preferably made correspondingly long and wide. The thus realized spring is thus outside the handle. The arrangement of the incision in the two base plates thus results in a parallel connection of the two springs.

In addition, the crimping tool has a pressure ring for accommodating the crimping dies of a particularly compact design and advantageous, wherein the pressure ring in turn has an opening in the form of a "lemon stocking".

Further advantageous embodiments of the crimping tool according to the invention for turned contacts can be found in the dependent claims.

Embodiments of a crimping tool according to the invention for rotated contacts are shown in the drawings and will be described in more detail below.

Figur 1:

eine Schnittdarstellung eines erfindungsgemäßen Crimpwerkzeugs für gedrehte Kontakte;

Figur 2:

eine Vorderansicht eines erfindungsgemäßen Crimpwerkzeuges für gedrehte Kontakte;

Figur 3:

eine Ausschnittsvergrößerung der Vorderansicht aus Fig. 2 eines erfindungsgemäßen Crimpwerkzeuges für gedrehte Kontakte, die insbesondere die zusammenwirkenden Crimpstempel zeigt;

Figur 4:

eine Schnittdarstellung eines erfindungsgemäßen Crimpwerkzeugs für gedrehte Kontakte, in der die für die Antriebsmechanik des Crimpwerkzeugs relevanten Bauteile hervorgehoben sind;

Figur 5:

eine Ausschnittsvergrößerung der Schnittdarstellung aus Fig. 4 eines erfindungsgemäßen Crimpwerkzeuges für gedrehte Kontakte, die insbesondere die für die Antriebsmechanik des Crimpwerkzeugs relevanten Bauteile im Bereich des Crimpgesenks zeigt;

Figur 6:

eine Vorderansicht eines erfindungsgemäßen Crimpwerkzeuges für gedrehte Kontakte, bei der sich eine erfindungsgemäße Kaskadenfeder in Grundstellung befindet;

Figur 7

eine Vorderansicht eines erfindungsgemäßen Crimpwerkzeuges für gedrehte Kontakte, bei der sich eine erfindungsgemäße Kaskadenfeder in maximaler Auslenkung befindet;

Figur 8:

eine räumliche Ansicht einer Ausschnittsvergrößerung der Schnittdarstellung aus Fig. 4 eines erfindungsgemäßen Crimpwerkzeuges für gedrehte Kontakte, die insbesondere die Anordnung des Lokators detailliert zeigt;

Figur 9:

eine räumliche Ansicht einer Leiterader mit abisoliertem Ende und durch ein erfindungsgemäßes Crimpwerkzeug für gedrehte Kontakte aufgecrimpter gedrehter Kontakt.

Show it:

FIG. 1:

a sectional view of a crimping tool according to the invention for rotated contacts;

FIG. 2:

a front view of a crimping tool according to the invention for rotated contacts;

FIG. 3:

an enlarged detail of the front view Fig. 2 a rotated contact crimping tool according to the invention, particularly showing the co-operating crimping dies;

FIG. 4:

a sectional view of a crimping tool according to the invention for rotated contacts, in which the components relevant to the drive mechanism of the crimping tool are highlighted;

FIG. 5:

an enlarged detail of the sectional view Fig. 4 a crimping tool according to the invention for rotated contacts, which in particular shows the relevant components for the drive mechanism of the crimping tool in the region of the crimping die;

FIG. 6:

a front view of a crimping tool according to the invention for rotated contacts, in which a cascade spring according to the invention is in the home position;

FIG. 7

a front view of a crimping tool according to the invention for rotated contacts, in which a cascade spring according to the invention is in maximum deflection;

FIG. 8:

a spatial view of an enlarged detail of the sectional view Fig. 4 a crimping tool according to the invention for rotated contacts, which shows in particular the arrangement of the locator in detail;

FIG. 9:

a spatial view of a conductor wire with stripped end and by a crimping tool according to the invention for rotated contacts crimped turned contact.

For the purposes of the present invention, the term "twisted contact" is understood to mean contacts based on flexible conductors whose flexibility is based on the combination of a multiplicity of thin conductor wires that are combined to form a conductor through a sheath of the conductor. If such conductors, for example, integrated into plugs, usually corresponding contacts are used, which consist on the one hand of a sleeve which record the stripped conductor in the uncrimped state and form a solid contact on the other side, for example, integrated into a plug with multiple contacts become can. Such contacts are made, for example, as an automatic lathe, so that the term "rotated contact" in a noticeable manner about a possible manufacturing technology of such a contact information, so that such contacts are known in this term to a corresponding expert in the art.

In Fig. 1 a crimping tool 101 according to the invention for crimping turned contacts on electrical conductors 3 (not shown) is shown. The hand-operated crimping tool 101 in the form of a pliers comprises a crimping die 104 with automatic adjustment to the crimping sleeve and conductor cross-section to be processed, which is formed from a plurality of crimping dies 105. A compressed rotated contact 102 may be implemented as a three or n-point crimp.

The crimping tool 101 has two base plates 106, between which essential components of the crimping tool 101 are mounted. Between two base plates 106, coaxial with a circular opening 107 (not shown) in the base plates 106, which serve to pass a conductor 103 to be crimped with a turned contact 102, there is a pressure ring 139. The pressure ring 139 takes three or more Crimp stamp 105 formed Crimpgesenk 104. The crimping dies 105 are each arranged and guided in a punch holder 141 radially to the opening 107 of the crimping die 104. The punch holder 141 is fixedly connected to the base plate 106 via bolts 140. A rotational angle limit on the pressure ring 139 formed by a pin 112 and a recess 113 that is movable relative to the stationary pin 112 defines the maximum angle of rotation of the pressure ring 139 and thus the minimum and maximum opening of the crimping die 104. The two base plates 106 are bolted together by the bolt 112.

To close the crimping die 104, the crimping tool 101 has a toggle kinematics 114. The toggle kinematics 114 is clamped between two hinge pins 115, 116 and an eccentric pin 117. The hinge points, which form the two hinge pins 115, 116 are connected by a push bar 118, wherein the hinge pin 115 is additionally connected to the base plates 106 and the hinge pin 116 in addition to a movable lever 119. The lever 119 can be provided with a handle 126 (not shown here). The pushrod 118 is supported at rest on a rounded projection 120 (not shown), which is an integral part of the pressure ring 139.

By turning the eccentric pin 117, the basic position of the crimping die 104 can be changed. Thereby, the opening degree of the opened crimping die 104 can be adjusted to the diameter of the rotated contact 102 before crimping, so that a substantial part of the working stroke of the crimping die 104 is prevented from having to be carried out only as an unproductive idle stroke until the crimp die 104 rotates with the rotated crimping die 104 Contact 102 comes into contact. An adjusting disk 121 and a flat-head screw 122 fix the eccentric pin 117 in the set position. The eccentric pin 117 serves only for basic adjustment and possibly the compensation of manufacturing tolerances. Usually, the eccentric pin 117 is not adjusted by the user of the crimping tool.

So that the crimping die 104 is always reliably actuated to the end stop, the thrust strut 118 has a toothing 123 into which a catch 124 engages, thus preventing premature opening of the crimping die 104. A compression spring 125 provides for the self-opening of the crimping die 104 after the crimped contact 102 has been crimped.

In Fig. 2 respectively. Fig. 3 a rotated contact 102 is shown inserted into the opened crimp die 104. By manually moving the handles 126, 127 of the crimping tool 101 together, the rotated contact 102 on the conductor 103 (not shown) is crimped. It is essential to the invention that the handles 126, 127 or the components 119, 106 enclosed by the handles 126, 127 have no local cross-sectional reductions or weakenings, eg in the form of a constriction, from which an increased elasticity or an increased spring action would result.

In Fig. 4 or 5, the drive mechanism of a crimping tool 101 according to the invention for rotated contacts 102 is illustrated. By operating the lever 119, the toggle kinematics 114 is further brought into the extended position, whereby the pressure ring 139 performs a rotary movement in a clockwise direction. Through the contact in area S between the pressure ring 139 and the crimping die 105, the pressure ring 139 slides along the crimping dies 105 and radially moves the crimping dies 105 toward the contact in the opening 107. The opening of the pressure ring 139 has to receive the punch holder 141 and the crimping die 105 has an opening whose geometry is reminiscent of the bore of a hydrodynamic sliding bearing in which a circular bore with two or more arc-like surfaces is extended, in which a lubricating wedge can form , Such plain bearings are known in the trade as "lemon rack". The contact area S in the pressure ring 139 can be designed as a curve with a constant slope or as a curve with a specially tuned pitch for optimizing manual and pressing forces. The crimping dies 105 are stored in the punch holder 141 for radial movement. The compression spring 142 moves the crimping dies 105 back to the starting position after the crimping process along the curve S.

In order to be able to process the different cross sections of the turned contacts 102 or conductor cross sections in a crimping die 104, a force-displacement compensating device in the form of a cascade spring 129 is integrated in each case in the base plate 106, which makes it possible to escape the rearward knee-joint fulcrum in the direction of the arrow (see FIG Fig. 6 or 7).

In each case over the surface H on the base plate 106, a second or other spring 131 of the cascade spring 129 is driven via a cylindrical pin 130. The spring 131 is located on the same plane as the thrust strut 118 located between the two base bleachers 106 and, like the thrust strut 118, has a thickness that is virtually identical to the gap between the base plates 106. The second or other spring 131 is attached as a single part to a lever-like extension of the base plates 106. In Fig. 1 if this is an example-simple and thus advantageously realized by two bolts 148. The attachment of the second or other spring 131 can also be realized in a different manner. Due to the advantageous spring action of the interaction of two springs, a first spring 132 and a second or other spring 131, an increased force and an enlarged path for the force-displacement compensating device for the crimping tool to be created are provided.

The cascade spring 129 takes on the required residual stroke of the crimping die 104 as elastic deformation work, when the crimping die 104 has already moved to block when crimping a turned contact 102, but still has to travel, so that the barrier 124 releases the opening of the crimping die 104. The crimping tool 101 thus automatically adjusts itself to the cross section of the turned contacts 102 and the conductor cross section to be crimped. This makes it possible to cover the crimping of conductor cross sections of 0.08 mm ² to 6.0 mm ² steplessly with only one crimping die 104. The crimping tool 101 can be closed until the lock 124 is skipped and opens automatically.

The integration of a first spring 132 of the cascade spring 129 as a parallel-connected leaf spring in the base plates 106 allows a compact design of the crimping tool 101 while precise tuning to the required force-displacement compensation. Compared to other designs, less space is required for the same performance.

The first spring 132 is bounded or realized respectively in the basic bleach 106 by an incision 137 running essentially parallel to the outer contour of the base metal sheet 106 into the base metal sheet 106. To reduce the mechanical stress at the end point 138 of the incision 137, the end point 138 of the incision 137 is made rounded. The incision 137 circumscribes the hinge pin 115 in its contour, so that the hinge pin 115 is located in each case in the region of the base plate 106 in the spring 132 and otherwise in the push bar 118, and opens at the top of the handle 127 respectively from the base plate 106. The spring 132 thus essentially receives in each case a geometry in the form of an arcuate or circular arc segment-shaped leaf spring, which is formed by the outer contour of the base plates 106 and the respective incision 137. In order to realize a significant spring travel of the spring 132, the incision 137 is designed in each case correspondingly long and wide. The spring 132 is thus outside the handle 127th

In order to prevent lifting of the surface H from the cylindrical pin 130 and the base plates 106 under load, the base plates 106 each have a high rigidity cross section in the region M. Deformation of the base sheets 106 below Load is thus prevented and realized a constant reproducible force-displacement.

In FIG. 8 a crimping tool 101 according to the invention is shown with a rotated contact locator 143. The locator 143 is set to the type of contact to be processed and engages via a toothing 144 in the set position. The contact 102 (not shown) is inserted into the opened crimp die 104 and held in crimping position by the locator 143. Simple handling and crimping at the intended location of the contact 102 is thus realized in a process-reliable manner. By operating the handle 126 or 119 of the tool 101, the contact 102 is crimped on the conductor 103 (not shown).

In Fig. 9 a conductor 103 is shown, on the stripped end of a rotated contact 102 has been pressed. In the example shown, the rotated contact 102 was crimped with a four-point crimp.

LIST OF REFERENCE NUMBERS

101

Crimp Tool

102

Turned contact

103

ladder

104

crimping die

105

crimping dies

106

base plate

107

opening

108

109

110

111

112

bolt

113

recess

114

Toggle kinematics

115

hinge pins

116

hinge pins

117

eccentric

118

Schubstrebe

119

lever

120

Rounded edge

121

adjustment disc

122

Flat headed screw

123

gearing

124

barrier

125

feather

126

Handle

127

Handle

128

129

cascade spring

130

straight pin

131

feather

132

feather

133

gearing

134

135

136

137

incision

138

endpoint

139

pressure ring

140

bolt

141

punch holder

142

compression spring

143

Locator

144

gearing

Claims (15)

1. Crimping tool (101) for turned contacts (102) on electrical conductors (103), which has a crimping swage (104) that is made up of at least three crimping stamps (105), which furthermore has at least one basic sheet metal piece (106) and at least one lever (119) by means of which, via a toggle lever kinetic (114), the opening (107) of the crimping swage (104) can be made smaller and which also has a force-distance adjustment device that is designed to receive the required residual stroke of the crimping swage (104) as elastic deformation action in a stage in which the crimping swage (104), during the crimping of a turned contact (102), is already run on the block, although the distance still has to be covered, so that a block (124) will release the opening of the crimping swage (104), wherein the force-distance adjustment device is made as a cascade spring (129), whose one - first - spring (132) is a part of the basic sheet metal pieces (106) and whose other spring (131) has a lever, characterized in that the first spring (132) is in each case limited toward the rest of the basic sheet metal piece (106) by a cut (137) into the basic sheet metal piece (106) and essentially has a geometry in the shape of an arc-shaped leaf spring.
2. Crimping tool (101) according to Claim 1, characterized in that the lever of the other spring (131) of the cascade spring (129) is arranged between the basic sheet metal pieces (106) and is preferably fastened on these with one of its ends.
3. Crimping tool (101) according to one of the above claims, characterized in that the cut (137) essentially runs in each case parallel to the outer contour of the basic sheet metal piece (106).
4. Crimping tool (101) according to one of the above claims, characterized in that the first spring (132) is a leaf spring, which essentially has a circular arc section-shaped geometry.
5. Crimping tool (101) according to one of the above claims, characterized in that the crimping tool (101) has a thrust collar (139) to receive the crimping stamp (105).
6. Crimping tool (101) according to one of the above claims, characterized in that the crimping stamp (105) of the crimping swage (104) are radially extended into a stamp holder (141) with relation to the opening (107) for the insertion of a turned contact (102) into the crimping swage (104).
7. Crimping tool (101) according to one of the above claims 5 or 6, characterized in that the crimping stamps are extended radially through a contact area (S) in the thrust collar (139).
8. Crimping tool (101) according to claim 7, characterized in that the contact area (S) is made as a curve with a constant slope.
9. Crimping tool (101) according to one of the above claims 7 or 8, characterized in that the contact area (S) is made as a curve with a slope.
10. Crimping tool (101) according to one of the above claims, characterized in that the crimping tool (101) phaselessly permits the crimping of conductor cross-sections with a size of 0.08 mm² to 6.0 mm².
11. Crimping tool (101) according to one of the above claims, characterized in that the crimping tool (101) has a locator (143) by means of which the contact (102) is inserted into the opened crimping swage (104) and is retained in the crimping position.
12. Crimping tool (101) according to claim 11, characterized in that the locator (143), after adjusting to the contact type to be processed, latches on in the adjusted position by means of a tooth gearing (144).
13. Crimping tool (101) according to one of the above claims, characterized in that the crimping tool (101) has an eccentric bolt (117) by means of which one can adjust the basic position of the crimping swage (104).
14. Crimping tool (101) according to claim 13, characterized in that the crimping tool (101) has an adjusting disc (121) and a flathead screw (122) by means of which the eccentric bolt (117) fixes them in the adjusted position.
15. Crimping tool (101) according to one of the above claims, characterized in that the crimping tool (101) has a thrust strut (118) that is worked into a tooth gearing (123) to which engages a block (124) and thus prevents a premature opening of the crimping swage (104).

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