JPH0737966U - Bundling fasteners and their molds - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a binding fastener in which the claws of the lock portion are unlikely to sag or bend, and are reliably locked to prevent a binding failure. [Structure] Band portion 20 for winding an object and band portion 2
In a binding fastener 10 having a base portion 21 of 0 and a lock portion 30 that locks by inserting and locking the band portion 20,
The band portion 20 is formed by forming a tooth portion 22 having a sawtooth-shaped cross section on one surface, and the lock portion 30 has an insertion hole 32 for the band portion 20 and the band portion 20 inserted through the insertion hole 32.
A plurality of ridges 36a, 36b, 36 so as to face the tooth portion 22 of
c has a claw portion 35 that is biased in the engagement direction,
The top portion 37 of the mountain 36a that is on the front side when the band portion 20 of the plurality of mountains 36a, 36b, 36c is inserted is cut out.
The molding die 40 uses the envelope curve of the valley of the claw portion 35 as the first split mold 4
The dividing line P1 between the first and second split dies 45,
The valley at the front of the foremost mountain 36a is defined by the dividing line P of the partial mold 47.
2 and the claw portion 35 is pulled out in the direction of the peaks 36a, 36
It is set so that b and 36c are not undercut.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a binding fastener having a band part around which an object is wound and a lock part which is connected to a base part of the band part and which is inserted into and locked by the band part, and a mold thereof.

[0002]

[Prior art]

 As a conventional technique, for example, there is one as shown in FIG. 11 or FIG. That is, the band portion 1 of the binding fastener is inserted into the lock portion so that the teeth 4 of the band portion 1 are engaged with the ridges 4a, 4b, 4c of the claw portion 3 of the lock portion. It has become. Each of the peaks 4a, 4b, 4c has a sharp tip.

Further, there is a conventional molding die as shown in FIG. 9, in which a molding recess 6 is formed so that the ridges 4 a, 4 b, 4 c of the claw portion 3 fit into the partial mold 5.

[0004]

[Problems to be solved by the device]

 However, in such a conventional technique, since the crests 4a, 4b, 4c of the claw portion 3 are sharp, the crests 3a, 4b, and 4c are likely to interfere with each other and sag easily. One of the teeth of the portion 2 rides on the tip of the tooth and becomes disengaged, or the mountain 4a is crushed as shown in FIG. In particular, when the band portion 1 is pulled in at a high speed, heat may be generated due to friction and local deformation is likely to occur, so that there is a problem that defective binding is likely to occur.

Further, also in the molding die, the portion a of the molding recessed portion 6 in FIG. 9 is undercut, and the peaks 4a, 4b, 4c are liable to sag, which leads to weakening of the peaks and causes the above problems. There was a problem that it became easier to do. As shown in FIG. 10, a part 7 of the base body of the lock part above the claw part 3 is cut out in order to facilitate the excessive raccoon dog, but the holding force of the band part 1 is weakened, so that it can be surely done. Not a solution.

The present invention has been made by paying attention to the problems of the conventional technique. The claws of the lock portion are unlikely to sag or bend, and the locking is performed securely. It is an object of the present invention to provide a binding fastener that is less likely to cause a bundle defect.

[0007]

[Means for Solving the Problems]

 The gist of the present invention for achieving such an object is as follows: 1 A band part (20) for winding an object and a base part (21) of the band part (20) are connected to each other to connect the band part (20). In a binding fastener (10) having a lock part (30) which is inserted and locked, the band part (20) is formed by forming a tooth part (22) having a sawtooth-shaped cross section on one surface thereof. A plurality of (30) has an insertion hole (32) for the band portion (20) and a plurality of them so as to face the tooth portion (22) of the band portion (20) inserted through the insertion hole (32). Of the band portion (20) of the plurality of ridges (36a, 36b, 36c) having a claw portion (35) biased in the engaging direction. The top part (37a) of the mountain (36a) that comes to the front when inserting is cut flat. Bundling fastener characterized by (10).

2 Inside the insertion hole (32) of the lock portion (30), guide portions (38a, 38b) for holding and guiding the side edge of the band portion (20) are properly provided. The binding fastener (10) according to claim 1, characterized in that

3. The forming die (40) of the binding fastener (10) according to claim 1 or 2, wherein the tip of the claw (35) is tapered, and the trough of the claw (35). Is used as a dividing line (P1) between the first split type (41) and the second split type (45), and the valley at the front of the foremost peak (36a) is divided into partial types (47). ) Dividing line (P2) and the cutting direction of the claw portion (35) is set so that the peaks (36a, 36b, 36c) are not undercut, Exist in.

[0010]

[Action]

 The binding fastener (10) wraps an object such as an electric wire in the band portion (20) extending from the lock portion (30), and the band portion (20) is inserted from the tip to the insertion hole (32) of the lock portion (30). Insert, lock and bind.

When the band part (20) is inserted from the tip into the insertion hole (32) of the lock part (30), the band part (20) is retracted with the claw part (35) elastically hitting the band part (20). A plurality of peaks (36a, 36b, 36c) of the claw portion (35) engage with the sawtooth-shaped tooth portion (22) on one side of (20). When the band portion (20) is pulled in, the saw tooth shape is in the normal direction, so that the crests (35a) (36a, 36b, 36c) easily get over the tooth portion (22) of the band portion (20). When climbing over, the top of the mountain (36a), which comes to the front when the band (20) is inserted, is notched flat and not sharp, so it does not sag and maintains a stable state.

When the band part (20) is sufficiently pulled in until the objects are bound and then released, the claws (35) of the lock part (30) have the crests (36a, 36b, 36c) of the band part (30). Since it meshes with the tooth portion (22) of 20) in the opposite direction, even if the band portion (20) is pulled backward, it is locked and will not come off.

When the guide portions (38a, 38b) are provided, the side edge of the band portion (20) is sandwiched and guided in the insertion hole (32) of the lock portion (30) so that the insertion posture is correct. The tooth portion (22) of the band portion (20) and the ridges (36a, 36b, 36c) of the claw portion (35) of the lock portion (30) are securely held in mesh with each other to prevent deformation. it can.

In the molding die (40), when the first split mold (41) and the second split mold (45) are separated after molding, the claw portion (35) is a split line that is the envelope of the valley. Since it separates from the mold with (P1) as a boundary, the first split mold (41) and the second split mold (45) can be separated from each other without resistance. Further, the partial mold (47) can also be smoothly separated by using the valley at the front of the foremost crest 36a as the dividing line (P2). Further, since the tip of the claw portion (35) is formed so as to be tapered and the pulling direction of the claw portion (35) is set so that each crest (36a, 36b, 36c) is not undercut. Even when the claw portion (35) is die-cut, there is no undercut and the claw portion (35) can be die-cut so that the peaks (36a, 36b, 36c) of the claw portion (35) do not sag or deform.

[0015]

【Example】

 Various embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention. The binding fastener 10 includes, for example, a band portion 20 around which an object such as an electric wire is wound and a base portion 21 of the band portion 20 that is integrally connected and a lock portion 30 that inserts and locks the band portion 20. A mounting pin portion 16 for fixing the binding fastener 10 itself is provided on the piece portion 15 that extends from the lock portion 30.

The mounting pin portion 16 has a pointed tip and a locking wing portion 17 having a wide base portion. The locking wing portion 17 can be reduced in diameter and is omitted from the tip of the mounting pin portion 16. The binding fasteners 10 are fixed by pushing them into the mounting holes and opening the locking wings 17 on the opposite side.

The band portion 20 has a tooth portion 22 having a sawtooth-shaped cross section formed on one surface from the base portion 21 to the tip. The tip portion of the band portion 20 is a flat tongue portion 25 on which the tooth portion 22 is not formed.

The lock portion 30 has an insertion hole 32 for the band portion 20 formed in the lock base 31, and a plurality of ridges 36 a, 36 b, 36 c are formed so as to face the tooth portion 22 of the band portion 20 inserted through the insertion hole 32. A claw portion 35 that has and is biased in the engagement direction is provided upright in the insertion hole 32.

The base portion 35a of the claw portion 35 is thin so that the biasing force can be obtained by the deformation of this portion, and the claw portion 35 comes to the front when the band portion 20 of the plurality of peaks 36a, 36b, 36c is inserted. The top portion 37a of the mountain 36a is flatly cut out. It should be noted that this is not flat and may have an angle or be rounded.

As can be seen in FIGS. 3 and 4, the pawl portion 35 is provided in the center of the insertion hole 32 of the lock portion 30, and when inserted, the side edges of the band portion 20 are projected to both sides. Guide portions 38a, 38b for sandwiching the side edges on both sides from above and below to properly hold and guide the insertion posture are provided corresponding to the side edges on both sides.

Next, the operation will be described. When the binding fastener 10 is attached, the band portion 20 extending from the base portion 21 connected to the lock portion 30 is wound around an object such as an electric wire, and the band portion 20 is formed into a ring shape from the tongue piece portion 25 at the tip. Insert into the insertion hole 32 of the lock portion 30. The tongue piece 25 has no tooth 22 and is flat so that it can be easily inserted.

When the band portion 20 is inserted from the tongue piece portion 25 into the insertion hole 32 of the lock portion 30 and retracted, the tip portions of the ridges 36 a, 36 b, 36 c of the claw portion 35 are resiliently hit by the band portion 20. Is drawn in. A plurality of crests 36 a, 36 b, 36 c of the claw portion 35 engage with the saw-toothed tooth portion 22 on one side of the band portion 20.

When the band portion 20 is pulled in, it is in the normal direction of the sawtooth shape. Therefore, as shown in FIG. 5, the front crest 36a is hooked by the tooth 22 and the claw 35 falls, and the claw 36a of the claw 35a falls. , 36b, 36c easily get over the tooth portion 22 of the band portion 20.

When climbing over, the peaks 37a of the ridges 36a, 36b, 36c, which come to the front when the band portion 20 is inserted, are notched flat and not pointed, so there is no sagging and a stable state is maintained. keep.

When the band portion 20 is sufficiently pulled in until the objects are bound and then released, the crests 35 a, 36 b, 36 c of the claw portions 35 of the lock portion 30 are now turned upside down with respect to the tooth portions 22 of the band portion 20. Since they engage with each other in the direction, even if the band portion 20 is pulled backward, it is locked and does not come off.

When the guide portions 38a and 38b are provided, the side edges of the band portion 20 are vertically sandwiched and guided in the insertion hole 32 of the lock portion 30 so that the insertion posture is properly maintained, and the band portion is held. The tooth portion 22 of 20 and the crests 36a, 36b, 36c of the claw portion 35 of the lock portion 30 are reliably and stably engaged in parallel with each other to prevent further sagging or deformation.

FIG. 6 shows a second embodiment in which not only the foremost crest 36a but also the tops 37a, 37b of the crests 36b, 36c further ahead are notched flat.

FIG. 7 and FIG. 8 show an embodiment of a mold for a binding fastener. The crest 36c at the tip of the claw portion 35 is formed to be tapered, and the envelope curve of the valley of the claw portion 35 is divided into a first split mold 41 of the molding die 40 and a second split mold 45. The line P 1 is set, the valley at the front of the foremost crest 36 a is set as the second dividing line P 2, and the extraction direction of the claw portion 35 is set so that the crests 36 a, 36 b, 36 c are not undercut. There is.

When the first split mold 41 and the second split mold 45 are separated from each other in the mold 40 after molding, the claw portion 35 separates from the mold with the dividing line P1 which is the envelope of the valley as a boundary. Therefore, the first split mold 41 and the second split mold 45 can be separated from each other without resistance. Moreover, the valley at the front of the foremost crest 36a can be smoothly separated as the dividing line P2. Since the tip of the claw portion 35 is formed so as to be tapered and the extraction direction of the claw portion 35 is set so that the peaks 36a, 36b, 36c are not undercut, when the claw portion 35 is die-cut. However, there is no undercut, and the portion b can be slid and extracted without interference, and the claws 35 can be die-cut so that the ridges 36a, 36b, 36c do not sag or deform.

[0030]

[Effect of device]

 According to the binding fastener of the present invention, since the crests 37 of the crests of the lock part that mesh with the teeth of the band part are cut out at the tops 37 of the crests, the claws are deformed or deformed. Difficulty, secure engagement, and improved durability. The one provided with a guide part that correctly holds and guides the insertion position of the band part is more reliable because the meshing is stable. Further, since the molding die has no undercut and is prevented from being forcibly removed, it is possible to surely mold the binding fastener in which the claw portion does not sag or deform during molding.

[Brief description of drawings]

FIG. 1 is a front view showing a binding fastener according to a first embodiment of the present invention.

FIG. 2 is a front view showing the binding fastener according to the first embodiment of the present invention, showing the meshing state of the tooth portions of the band portion and the crests of the claw portion.

FIG. 3 is a front view showing the binding fastener according to the first embodiment of the present invention and showing the inside of the insertion hole of the lock portion.

FIG. 4 is a side view showing the binding fastener according to the first embodiment of the present invention and showing the inside of the insertion hole of the lock portion.

FIG. 5 is an explanatory view showing the binding fastener according to the first embodiment of the present invention, showing a state in which the crests of the claws pass over the teeth of the band.

FIG. 6 is a front view of a claw portion of a binding fastener according to a second embodiment of the present invention.

FIG. 7 is a partial front view showing an embodiment of the molding die according to the present invention.

FIG. 8 is an explanatory view showing an embodiment of a molding die according to the present invention and showing a state where a molded product is demolded.

FIG. 9 is an explanatory diagram of a molding die according to a conventional technique.

FIG. 10 is an explanatory view showing a part of a binding fastener according to a conventional technique.

FIG. 11 shows a portion of a binding fastener according to the prior art,
It is explanatory drawing which shows the meshing state of the tooth | gear part of a band part, and the crest of a claw part.

FIG. 12 shows a portion of a binding fastener according to the prior art,
It is explanatory drawing which shows the meshing state of the tooth | gear part of a band part, and the crest of a claw part.

[Explanation of symbols]

 10 ... Bundling fastener 20 ... Band part 21 ... Base part 22 ... Tooth part 25 ... Tongue part 30 ... Lock part 31 ... Lock base 32 ... Insertion hole 35 ... Claw parts 36a, 36b, 36c ... Mountain 37a, 37b, 37c ... Top part 38a, 38b ... Guide part 40 ... Molding die 41 ... First splitting die 45 ... Second splitting die P1, P2 ... Dividing line

Claims (3)

[Scope of utility model registration request] 1. A binding fastener having a band part for winding an object and a lock part for connecting a base part of the band part and inserting and locking the band part, wherein the band part has a cross section on one side. The toothed portion is formed in a sawtooth shape, the lock portion has an insertion hole for the band portion, and has a plurality of peaks so as to face the toothed portion of the band portion inserted through the insertion hole. A binding fastener having a claw portion biased in an engaging direction, wherein the top of the mountain closest to the front when the band portion of the plurality of mountains is inserted is cut out. 2. The binding fastener according to claim 1, further comprising: a guide portion that holds a side edge of the band portion inside the insertion hole of the lock portion to properly guide and guide the insertion posture. . 3. A forming die for a binding fastener according to claim 1, wherein the tip of the claw portion is formed to be tapered, wherein the envelope of the valley of the claw portion is a first split mold. In addition to the first dividing line with the second dividing type, the valley in the front part of the foremost peak is the second dividing line, and the extraction direction of the claws is such that each mountain does not undercut. Mold that is set.