JPH0224246Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Purpose of the Invention" The present invention relates to a clutch mechanism for an antenna extension/retraction actuator, and is intended to simplify the assembly of the clutch mechanism of the antenna extension/retraction actuator, and to provide effective clutch actuation and antenna extension/retraction control operations. It's something you try to gain.

[Industrial application field]

A clutch mechanism in the actuating section for extending and retracting the antenna.

[Conventional technology]

Regarding the use of motor-driven gears or pulleys to automatically extend and retract antenna elements assembled in a telescopic manner or antenna members that can ensure linearity and conductivity when extended. Various proposals have been made and put into practical use in the past, but in practical terms it is essential to incorporate a clutch part in such an automatic antenna extension/retraction operation mechanism. It is necessary to ensure that even if the drive of the motor or the inertial rotation of the gear or pulley continues, the clutch will not act and strain the wire, antenna element, or its drive system and cause damage. Therefore, various clutch mechanisms of this type have been proposed and put into practical use.In other words, a winding body is provided coaxially with a rotating body driven by a motor, and such a rotating body and winding body are connected to each other. The clutch mechanism includes, for example, a clutch plate formed with about four steel balls and a recess for receiving some of the steel balls, and the clutch plate is made of steel. It usually consists of a coil spring, nut, washer, etc. that press against the ball. It should be noted that such conventional conventional devices have complicated structures and are large in size, and the adjustment and assembly of the clutch mechanism must be performed while the entire telescopic actuation mechanism is assembled, making the adjustment operation extremely complicated. An elastic member and a clutch plate are disposed on an interlocking gear provided between a wire feeding rotary body and a motor that extend and contract the antenna element or the antenna member, and the wire is passed through the gear portion formed on the clutch plate. Japanese Utility Model Application Publication No. 57-57608 proposes driving the feed rotary body.

[Problem that the invention attempts to solve]

In the above-mentioned device invented by the present inventor in a prior application, the clutch mechanism is assembled in a compact state, and the clutch mechanism can be disengaged at the extension or retraction limit of the antenna, and the adjustment of the clutch mechanism is easy. It has the advantage that it can be achieved only with a member that can be taken out separately from the overall operating mechanism, but the elastic force adjustment operation is not always sufficient, and the clutch disengages properly at the extension and retraction limits. However, there are disadvantages such as the need to take special measures to stop the drive motor.

``Structure of the invention'' [Means for solving the problems] The present invention was devised after repeated studies in view of the above-mentioned circumstances. In order to engage an interlocking gear driven by a motor via an intermediate gear, a flange is formed on a shaft rod inserted into the intermediate gear and the interlocking gear, and a flange is formed between the flange and the intermediate gear. A bullet plate is interposed, cuts are formed in the bullet plate to provide a plurality of tread pressure parts, and the wire feeding rotary body and intermediate gear are connected to the threaded part formed at the end of the shaft rod. A nut part body for adjusting and setting the clutch pressure contact force by the bullet plate between the parts is screwed together, a rotary contact piece is attached to the nut body body, and a plurality of contacts to be connected to the wiring board are attached to the rotary contact piece. The antenna extension/contraction operating mechanism is characterized in that the antenna is arranged to form a motor drive control detection means.

[Effect]

A notch is formed in a bullet plate interposed between a flange of a shaft rod inserted in an interlocking gear driven by a motor and engaged with a wire feeding rotating body and an intermediate gear that performs a clutch action, and the intermediate gear. By arranging a plurality of tread pressure parts, it is possible to adjust and set an appropriate elastic force over a relatively wide range. By engaging the motor-driven interlocking gear with the shaft rod, the shaft rod is properly interlocked with the wire feed rotating body, and this can be used as a control detection means corresponding to the telescopic length of the motor-driven antenna. . By appropriately adjusting and setting the clutch action, and by accurately detecting and controlling the operation of the motor-driven wire feeding rotary body, stable and appropriate automatic extension and retraction operations of the antenna can be realized.

〔Example〕

A specific embodiment of the present invention as shown in the attached drawings will be described. As shown in FIG. 1, a plurality of antenna elements 11 are attached to an antenna base cylinder 12 in a telescopically expandable manner, One end of a wire 1, a part of which is shown in FIG. It is configured to engage with a gear 2 as a wire feeding rotary body provided in the. The first intermediate gear 6 engages with the motor worm 5a coaxial with the motor 5 provided at the upper part of the case 10, and the second intermediate gear 7 engages with the small diameter gear portion 6a of the intermediate gear 6. is engaged, and this second intermediate gear 7
The specific structural relationships regarding the parts are shown separately in FIGS. 4 and 5. That is, the shaft rod 8 having the flange 8a is provided with notches 8c, 8c on both sides,
Further, as shown in FIG. 4, a threaded portion 8d is formed at the tip, and the collar portion 8a is provided with a notch 9b on the circumferential side as an elastic member, and a plurality of treading portions 9a are provided. The bulged small diameter portion 9c of the bullet plate 9 is joined, and the gear 7 has intervening plates 21 and 21 on both sides.
21, the bullet plate 9 is joined to one of these intervening plates 21, 21, and the interlocking gear 20 is attached to the other.
The clutch plate 20a, which is the same body as the above-mentioned notches 8c and 8c of the shaft rod 8, is engaged with and fitted into the notches 8c, 8c. Although the clutch plate 20a is loosely mounted, the clutch plate 20a is configured to constantly engage and rotate with the shaft rod 8. In this illustrated embodiment, a first intermediate gear 6 and a second intermediate gear 7 are used, and the second intermediate gear 7 is connected to the shaft rod 8.
However, depending on the case, only one intermediate gear may be required (in this case, the shaft rod 8 is inserted into that one intermediate gear).
The shaft rod 8 may be inserted into the first intermediate gear 6 even in the case of a single gear. Furthermore, the interlocking gear 20 portion of the clutch plate 20a is received by a cylindrical nut 19 screwed into the threaded portion 8d, and due to the elasticity of the bullet plate 9, each of the above-mentioned movements is caused by the elasticity of the bullet plate 9. The members 9, 7, 21, 21 and 20 are joined and assembled in the nut body 19 under appropriately adjusted pressure welding conditions. The above-mentioned shaft rod 8 is rotatably supported in a bearing portion formed in an intermediate partition wall 13 formed in the case body 10 and a lid member 16 attached to one end surface of the case body 10, respectively.

In this embodiment, a composite gear body 3 is rotatably provided in order to ensure engagement between the wire 1 having the rack 1a described above and the gear part 2 of the wire feeding rotary body. The gear portions 3a, 3a formed on both end surfaces of the wire feed gear 2 are engaged with the wire feed gear 2, and the gear portions 3a,
The wire 1 is inserted into the recess 3b formed between the antenna elements 3a and 3a, and the wire 1 has one end connected to the antenna element 11 as described above.
The other end is guided to a winding chamber 14 formed on the other side of the intermediate partition wall 13 of the case 10, and is adapted to be wound up on a reel portion 15 provided in the winding chamber 14. Another lid member 17 is attached to the back surface of the case 10 opposite to the lid member 16. Further, as shown in FIGS. 2 and 3, the intermediate partition wall 13 has a motor storage section 5b formed in a part thereof, and the reel section 15 described above has a motor storage section 5b formed therein. As shown in the figure, it is formed on the outside. That is, in this embodiment, the motor 5 for driving the gear 2 as described above is installed inside the case 10, whereas in the past, such a winding drive motor was disposed outside the case 10. However, the motor 5 is installed in the storage part 5b formed in the partition wall 13, and the motor gear 5a is
On the other hand, as described above, the intermediate interlocking gear 6 and the second intermediate interlocking gear 7 are sequentially engaged. In other words, a predetermined reduction ratio can be appropriately achieved through the interlocking configuration via such a series of intermediate gears, and moreover, the wire 1 can be accurately controlled in conjunction with the wire feed gear 2 by the above-mentioned composite gear body 3. By forming an expansion/contraction operation condition with no frictional resistance under the condition that the engagement relationship is maintained, it is possible to employ a relatively low output and small motor 5, and the motor 5 can be built into the case 10. As shown in Fig. 1, a telescoping operation mechanism which is simple in appearance and extremely compact has been obtained.

A locking member 33 is attached to the nut body 19 by forming a locking portion 33a, and the rotary contact piece 25 is attached to the locking member 33 via the receiving plate 32 and the elastic device 31. 25 has a plurality of contacts 25a
is provided on the wiring board 30 to obtain a pulse-like signal by intermittent energization, and the signal is sent to the motor 5.
The pulses are sent to a power supply circuit for the motor 5, and the drive of the motor 5 is controlled based on the counted number of pulses. That is, the engagement protrusion 2 is formed on the stepped portion 8e formed between the threaded portion 8d of the shaft rod 8 described above.
8 is formed, and the engagement protrusion 28 is connected to the cylindrical nut 19.
is engaged with one of the engagement strips 29 formed on the end face of the clutch to obtain a predetermined clutch elastic force, and when the motor is driven in this state, the energizing pulse obtained by the rotary contact piece 25 is transmitted to the electronic control circuit. It is configured to count the number of times corresponding to the length of expansion and contraction of the sending antenna and instruct on/off of driving the motor 5.
The rotary contact piece 25 is set so that a predetermined elastic force is obtained by the spring 31, that is, by the locking member 33 such as an E-ring engaged with the groove 19b of the nut body 19 and the receiving arm 32. has been done.

"Effects of the invention" According to the invention as described above, the interlocking gear engaged with the wire feeding rotary body is engaged with the shaft rod having a loose connection with the intermediate gear driven by the motor. Regardless of the clutch action between the gear and the wire feed rotary body, the shaft is accurately actuated by the motor, and therefore a motor drive control detection means is disposed for the shaft to drive the motor. A notch is formed in the bullet plate capable of detecting a signal for controlling the state and providing an elastic force to an intermediate gear having a clutch mechanism between the wire feeding rotary body and the interlocking gear driven by the motor. Since a plurality of treading parts are provided, the clutch action between the interlocking gear and the wire feeding rotary body can be adjusted to an appropriate degree over a wide range by means of the nut part that engages with the threaded part of the shaft rod. This is a highly effective idea in practical terms, as it enables a favorable clutch action and accurate motor drive conditions to be achieved, thereby achieving stable antenna expansion and contraction operations.

[Brief explanation of drawings]

The drawings show embodiments of the invention,
Fig. 1 is a general side view of the antenna expansion/contraction operation mechanism according to the present invention, Fig. 2 is a front view showing the internal structure of the case part, Fig. 3 is a sectional view taken along the line of Fig. FIG. 4 is a perspective view showing an exploded state of the main constituent members according to the present invention, and FIG. 5 is a sectional view of the assembled state. However, in these drawings, 1 is a wire, 2 is
is a wire feeding rotary body, 6 and 7 are intermediate gears, 8 is a shaft rod, 8a is a collar thereof, 8c is a notch thereof, 8d is a thread thereof, 9 is a bullet plate, 9a is a treading portion thereof, 9c
10 is the case body, 13 is the intermediate partition wall, 14 is the winding chamber, 15 is the reel portion, 16, 1
7 is a lid member, 19 is a cylindrical nut, 20 is an interlocking gear, 21 is an intervening plate, 25 is a rotating contact piece, 25a is a contact thereof, 28 is an engagement protrusion, 29 is an engagement strip, 30 is a wiring board This shows that.

Claims (1)

[Scope of utility model registration request] An interlocking gear driven by a motor via an intermediate gear is engaged with a wire-feeding rotating body for expanding and contracting an antenna element, wherein a flange is formed on a shaft rod inserted into the intermediate gear and the interlocking gear. a bullet plate is interposed between the collar portion and the intermediate gear, and a plurality of tread pressure portions are provided by forming cuts in the bullet plate;
Moreover, a nut part body for adjusting and setting the clutch pressure contact force by the bullet plate between the wire feed rotary body and the intermediate gear is screwed into the threaded part formed at the end of the shaft rod, 1. An antenna extension/contraction operating mechanism, characterized in that a rotary contact piece is attached to a member, and a plurality of contacts connected to a wiring board are arranged on the rotary contact piece to form a motor drive control detection means.