JPH11115625A - Driving device for telescopic pole and manufacture of drive cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely drive a drive cord. SOLUTION: This device is provided with a pinion 15 to be driven by a driving motor, a drive cord 12 having a rack 32 to be meshed with the pinion 15, and with a telescopic pole mounted to one end of the drive cord 12, and the drive cord 12 is composed of a slender cord main body 33 made of synthetic resin having both a shaft hole 31 and the rack 32, and of a core line 34 inserted into the shaft hole 31 of the cord main body 33. A projected part 32c is provided for the center of each tooth groove of the rack 32, and a recessed part 15b to be fitted in each projected part 32c of the rack 32 is provided for the teeth 15a of the pinion 15. Since the teeth 15a of the pinion 15 are meshed with the teeth grooves 32b of the rack 32, and each projected part 32c the rack 32 is also fitted in each recessed part 15b of the pinion 15, the slipping and twisting of the drive cord can thereby be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive apparatus for a telescopic pole for extending and contracting a corner pole for displaying the width of an automobile, an antenna pole for receiving radio waves, and the like via a drive cord, and a method for manufacturing a drive cord. It is about.

[0002]

2. Description of the Related Art Conventionally, a driving device of a telescopic pole used for an automobile antenna, a vehicle side light, and the like is composed of a telescopic pole attached to a vehicle body so as to be extendable and retractable and a drive cord having one end connected to the telescopic pole. And a drive motor for driving the drive code. The telescopic pole is formed by sequentially fitting a plurality of pipes having different diameters, and one end of the drive cord is connected to the uppermost pipe. The other end of the drive cord is connected to the drive motor via a drum or a gear.

[0003] In many cases, a drive cord is driven by being wound up or unwound by a drive motor via a drum. Recently, however, a rack formed on the drive cord and a drive motor without using a drum have been used. A mechanism that is driven in the front-rear direction by engaging with a provided pinion has begun to be widely used.

At this time, a core wire is not required for a drive cord used for an antenna pole, but a core wire for power supply is required for a drive cord used for a corner pole of a vehicle side light. The drive cord used for the latter corner pole includes a cord body made of synthetic resin having a shaft hole and a rack, and a core wire inserted into the shaft hole of the cord body.

Usually, the cross-sectional shape of the cord body is circular, the diameter of the shaft hole is about one fourth of the outer diameter of the cord body, and the cord body is given a uniform material density.
When manufacturing a drive cord, first, a cord body having a shaft hole is extruded from a synthetic resin material, then a core wire is inserted into the shaft hole of the cord body, and finally the cord body is moderately softened. A rack is formed.

[0006]

However, normally, the tooth tip surface of the pinion and the tooth bottom surface of the rack are flat, so that the drive cord is shifted or twisted in the left-right direction, so that the driving force of the pinion is good for the rack. There is a problem that is not transmitted to. Also, when forming a rack on the drive cord, the shaft hole may be crushed or the core wire may be deformed, so that the drive cord is repeatedly subjected to a tensile force or a compressive force due to a normal operation, or a difference in thermal expansion coefficient. When the expansion and contraction of the synthetic resin cord body and the metal core wire are caused by the above, the change of the core wire cannot follow the change of the cord body, and the drive cord may be cut.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a drive device of a telescopic pole capable of reliably driving a drive cord and a method of manufacturing a drive cord capable of forming a shaft hole in a good shape.

[0008]

According to the present invention, there is provided a driving apparatus for a telescopic pole according to the present invention, comprising a pinion driven by a driving motor, and a drive cord made of synthetic resin having a rack meshed with the pinion. And a telescopic pole drive device comprising: a telescopic pole attached to the tip of the drive cord, wherein a convex portion is provided at the center of the tooth groove of the rack, and the pinion tooth is fitted to the convex portion of the rack. A concave portion is provided.

A method of manufacturing a drive cord according to the present invention comprises a first step of extruding a thin cord body having a substantially rectangular cross section made of a synthetic resin material around a synthetic fiber yarn, A second step of forming
A third step of extracting the synthetic fiber yarn from the cord body to form a shaft hole, and a fourth step of inserting a core wire into the shaft hole.
And the step of:

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a sectional view of a main part of an embodiment. For example, a corner pole 2 as a telescopic pole is attached to a predetermined position of a body 1 of an automobile via a case 3 so as to be extendable and retractable. The corner pole 2 is formed by fitting a plurality of pipes 4 having different diameters, and an indicator lamp 5 is attached to an upper part of the uppermost pipe 4. A drive mechanism 6 for extending and retracting the corner pole 2 is provided inside the body 1.
Through a connection pipe 7. A power supply mechanism (not shown) for the indicator lamp 5 is provided inside the corner pole 2 and the connection pipe 7 so that power is supplied to the power supply mechanism via a power supply line 8 arranged at the bottom of the drive mechanism 6. Has become.

Inside the housing 11 of the drive mechanism 6, a drive cord 12 having one end connected to the uppermost pipe 4 of the corner pole 2 is provided with a guide portion (not shown) provided inside the connection pipe 7 and a housing 11. Are guided in the horizontal direction by the guide member 13 disposed at the bottom of the. The other end of the drive cord 12 is stored in a storage pipe 14 connected to the housing 11.

Further, inside the housing 11, a pinion 15 meshed with a later-described rack of the drive cord 12 is rotatably supported by a support shaft 16, and a support shaft 1 is provided.
A worm wheel 17 is supported on the pinion 6 integrally with the pinion 15. Worm 18 on worm wheel 17
The worm 18 is fixed to a drive motor 19 that can rotate reversibly, and the drive motor 19 is supplied with power via a power supply line 20.

FIG. 2 shows a drive cord 12 and a pinion 15.
FIG. 3 is a transverse sectional view of the drive cord 12 in which the drive cord 12 is disassembled.
Cord body 3 made of synthetic resin and has a rack 32
3 and a conductive metal core wire 34 inserted through the shaft hole 31 of the cord body 33.

The outer shape of the cross section of the cord body 33 is a substantially rectangular shape having an upper surface 33a, a lower surface 33b, and both side surfaces 33c and 33d, and the shaft hole 31 is provided at a position eccentric to the lower surface 33b. . The rack 32 is formed on the upper surface 33a of the cord main body 33 and has teeth 32a and tooth grooves 32b. In the center of the tooth groove 32b of the rack 32, a convex part 32c having an arc-shaped cross section is formed, and the height of the convex part 32c is about half the depth of the tooth groove 32b. Further, a recess 15 b into which the projection 32 c of the rack 32 is fitted is formed in the tooth 15 a of the pinion 15.

In manufacturing such a drive cord 12, a cord body 33 having no rack 32 made of a synthetic resin material is extruded around a synthetic fiber yarn such as a nylon yarn used for a fishing line. And the code body 3
3 is not sufficiently solidified, the cord body 33
The rack 32 is formed by embossing. Thereafter, the cord body 33 is cut to a predetermined length, and then the synthetic fiber yarn is extracted to form the shaft hole 31. Finally, the core wire 34 is inserted into the shaft hole 31.

As shown in the perspective view of FIG. 4, the guide member 13 includes guide pieces 13a and 13b which are opposed to each other and a bridge piece 13c.
The two guide pieces 13a and 13b are integrally supported by an arc-shaped contact portion 13d which elastically contacts the drive cord 12.
13e are formed respectively.

When the corner pole 2 is extended, the drive motor 19 rotates the worm 18 in a predetermined direction. As a result, the worm wheel 17 and the pinion 15 rotate counterclockwise, and the pinion 15 drives the rack 32 rightward, thereby driving the drive cord 12 rightward. Then, the drive cord 12 pushes up the uppermost pipe 4 and extends the corner pole 2 upward.

At this time, the teeth 15a of the pinion 15 are meshed with the tooth grooves 32b of the rack 32 of the drive cord 12, and the projection 32c of the drive cord 12 is fitted into the recess 15b of the pinion 15. The pinion 15 reliably drives the drive cord 12 while preventing displacement and twisting. On the other hand, when the corner pole 2 is reduced in scale, the drive motor 19 rotates in the opposite direction, and the drive cord 12 is driven in the opposite direction to reduce the corner pole 2.

As described above, in the embodiment, the drive code 1
The second rack 32 is provided with a convex portion 32c at the center of the tooth groove 32b, and the pinion 15 has a concave portion 15b
Is provided, the teeth 15a of the pinion 15 mesh with the tooth grooves 32b of the drive cord 12, and the projections 32c of the drive cord 12 are fitted into the recesses 15b of the pinion 15, thereby preventing the drive cord 12 from shifting and twisting. And can be driven reliably.

When the drive cord 12 is manufactured, a rack 32 made of a synthetic resin material is provided around the synthetic fiber yarn.
Is extruded, and then a rack 32 is formed in the cord body 33.
Since the shaft hole 31 is formed by extracting the synthetic fiber yarn from 3, the shape of the shaft hole 31 can be formed well, and the core wire 34 can be easily inserted into the shaft hole 31.

In the embodiment, the drive cord 12 provided with the shaft hole 31 has been described. However, as described in the section of the prior art, it is unnecessary to insert the core wire 34 into the drive cord used for the antenna pole. Therefore, the shaft hole 31 may not be provided.

[0022]

As described above, in the telescopic pole driving device according to the present invention, the projection is provided at the center of the tooth groove of the rack, and the recess of the pinion tooth is fitted to the projection of the rack. Therefore, when the drive motor drives the drive cord, the teeth of the pinion mesh with the tooth grooves of the rack, and the protrusion of the rack fits into the recess of the pinion to prevent the drive cord from shifting and twisting. It can be driven reliably.

In the method for manufacturing a drive cord according to the present invention, a rack is formed in a state where the rack has synthetic fiber yarns.
Thereafter, the synthetic fiber yarn is extracted from the cord body to form the shaft hole for the core wire, so that the shape of the shaft hole can be formed well and the core wire can be easily inserted into the shaft hole.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an embodiment.

FIG. 2 is a partial perspective view showing a drive cord and a pinion separated from each other.

FIG. 3 is a cross-sectional view of a drive cord.

FIG. 4 is a perspective view of a guide member.

[Explanation of symbols]

 2 Corner pole 6 Drive mechanism 12 Drive cord 15 Pinion 15a Teeth 15b Depression 19 Drive motor 31 Shaft hole 32 Rack 32a Teeth 32b Tooth groove 32c Convex part 33 Cord body 34 Core wire

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[Procedure amendment]

[Submission date] March 31, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (5)

[Claims] 1. A telescopic pole driving device comprising: a pinion driven by a driving motor; a synthetic resin drive cord having a rack meshing with the pinion; and a telescopic pole attached to a tip of the drive cord. A driving device for a telescopic pole, wherein a convex portion is provided at the center of the tooth groove of the rack, and a concave portion that fits into the convex portion of the rack is provided at the tooth of the pinion. 2. The driving apparatus for a telescopic pole according to claim 1, wherein the height of the projection of the rack is substantially half the depth of the tooth space. 3. The drive device for a telescopic pole according to claim 1, wherein the drive cord has a substantially rectangular cross section. 4. The drive device for a telescopic pole according to claim 1, wherein the drive cord has a core wire. 5. A first extruding method of extruding an elongated cord body having a substantially rectangular cross section made of a synthetic resin material around a synthetic fiber yarn.
A second step of forming a rack in the cord body, a third step of extracting the synthetic fiber yarn from the cord body to form a shaft hole, and a fourth step of inserting a core wire into the shaft hole. A method for manufacturing a drive code, comprising the steps of: