Communications: radio wave antennas – Antennas – Rod type
Patent
1997-08-01
1999-09-28
Wong, Don
Communications: radio wave antennas
Antennas
Rod type
343877, 343711, 343713, 343715, H01Q 110
Patent
active
059595930
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a device for telescoping a power antenna. More particularly, in an electric power antenna mechanism for automatically extending and contracting an antenna by an ON/OFF operation of a radio receiver installed to a car, this invention relates to a device for telescoping a power antenna having a relatively simple construction and yet exhibiting a reliable operation which automatically stops a driving motor when a load exceeding a predetermined level is applied to an antenna driving motor due to a telescoping problem encountered when the antenna is automatically extended or contracted fully, or during its operation. This prevents burn-out of the motor and damage to a telescoping mechanism and can reliably prevent the occurrence of an erroneous operation such as repetition of an UP/DOWN operation.
BACKGROUND ART
Various proposals have been made in the past to telescopically and automatically operate a car antenna by an operation inside a car. The present applicant has made some proposals in JP,A 279602/1989 (Patent Laid-Open No. 279602 laid open in Japan in 1989), JP,A 206712/1993 and JP,U 52204/1994 (Utility Model Laid Open No. 52204 laid open in Japan in 1994). The inventor of the present invention has made various studies on the production methods of these products and their utilization. In other words, when the automatic telescoping operation of the antenna is carried out in these prior art proposals, a moving operation rotary body, such as a drum or a gear for actuating a wire or a rope for telescoping the antenna element by a worm driven by a motor through a worm wheel, is rotated, thereby telescoping the antenna element. In this instance, the worm wheel is slidably disposed on a support shaft for the worm wheel so that the worm wheel has the function of a limit switch for turning ON and OFF the supply of power to the motor.
According to JP,A 279602/1989, the worm wheel driven by the motor is formed into an intermediate gear portion having integrally formed therewith a small diameter gear portion meshing with a rotary body gear portion. This intermediate gear portion is movably set to a support shaft with a gear support frame having a switch operation portion. A limit switch using a reversing spring is set in each power supply circuit for applying a forward rotation or reverse rotation to the motor, and a flexible arm member is disposed on this limit switch and is operated by the switch operation portion of the gear support frame.
JP,A 206712/1993 describes the following construction. A rotary body for telescoping an antenna element and a worm are rotated through a worm wheel engaging with the worm. An intermediate gear member having integrally formed therewith a small diameter gear meshing the worm wheel with the rotary body is provided, the intermediate gear member being movably fitted to a gear member support frame having an operation portion for a switch disposed in a motor driving circuit. A flexible member for locking is fitted to the gear portion support frame, and an engagement/disengagement mechanism for restricting a torque of movement of the gear portion support frame is disposed between the gear portion support frame and the flexible member for locking. A spherical member and a round fitting hole to which the spherical member is fitted are provided as the engagement/disengagement mechanism.
Further, JP,U 52204/1994 describes the following construction. A fixed contact, a movable contact mating with the fixed contact and a fitting recessed portion for engaging and disengaging a push member are disposed on a movable contact plate as a seesaw type operation member which is pivotally supported at its intermediate portion. A gear holding frame is slidably disposed on a shaft member disposed with a gear on a fixed member. The push member is disposed in a recessed portion formed in the gear holding frame through a spring, and when the gear holding frame slides along the shaft member, the push member is fitted into, and is released from, the fitting recess
REFERENCES:
patent: 4875053 (1989-10-01), Harada
patent: 5019834 (1991-05-01), Suga
patent: 5235344 (1993-08-01), Shinkawa
Clinger James
Nippon Antenna Company Limited
Wong Don
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