EP0345002B1 - A clutch for an electrically driven telescopic antenna - Google Patents

A clutch for an electrically driven telescopic antenna Download PDF

Info

Publication number
EP0345002B1
EP0345002B1 EP19890305404 EP89305404A EP0345002B1 EP 0345002 B1 EP0345002 B1 EP 0345002B1 EP 19890305404 EP19890305404 EP 19890305404 EP 89305404 A EP89305404 A EP 89305404A EP 0345002 B1 EP0345002 B1 EP 0345002B1
Authority
EP
European Patent Office
Prior art keywords
clutch
main body
antenna
elastic pressure
unevenly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19890305404
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0345002A3 (en
EP0345002A2 (en
Inventor
Kiyoshi Tezuka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harada Industry Co Ltd
Original Assignee
Harada Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harada Industry Co Ltd filed Critical Harada Industry Co Ltd
Publication of EP0345002A2 publication Critical patent/EP0345002A2/en
Publication of EP0345002A3 publication Critical patent/EP0345002A3/en
Application granted granted Critical
Publication of EP0345002B1 publication Critical patent/EP0345002B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/10—Telescopic elements

Definitions

  • This invention relates to a clutch for an electrically driven telescopic antenna for use in such as a car.
  • An electrically driven telescopic antenna is constructed so as to be telescopically extended or shortened as a motor is rotated forwardly or reversely, respectively. After the extension and shortening of the antenna have been completed, the motor is over-loaded. If this state continues, an excessive current continuously flows in the motor, resulting in the burning of windings.
  • a clutch is disposed between the motor and the antenna. The clutch disengages the motor from the antenna by causing the driving member to slip on the driven member after the extension and the shortening of the antenna have been completed.
  • the contacting surfaces of the driving clutch disc and the driven clutch disc are provided with projections and depressions, and both the surfaces are pressed against each other by biasing the clutch discs by means of compressed springs.
  • This conventional clutch has the following drawback.
  • the clutch When the clutch is in a disengaged state, or when the driving clutch disc slips on the driven clutch, the projections and depressions formed on the contacting surfaces of the clutch discs made of relatively hard material are strongly rubbed against each other and worn out heavily. Therefore, the clutch pressure is lowered in a relatively short time. Since the biasing forces of the compressed springs vary and are weakened in a relatively short time, it is difficult to give the clutch discs a stable contacting pressure. Thus, it was impossible to obtain a clutch pressure which was maintained stably for a long time.
  • the driving clutch disc, the driven clutch disc and the compressed springs are assembled into a body, many attachments are required and much assembling time is needed. Accordingly, the conventional clutch had the disadvantages that the structure was complicated and the manufacturing cost could not be reduced.
  • the object of this invention is to provide a clutch for an electrically driven telescopic antenna which produces a stable predetermined clutch pressure for a long time, and which has a simple construction and is manufactured at a low cost.
  • a plurality of elastic pressure units are arranged on either one of a first main body and a second main body so as to be extended radially from the central axis thereof.
  • the inner peripheral surface of the other one of the first and second main bodies forms an unevenly configurated portion for engaging with the elastic pressure members or disengaging therefrom when the first and second main bodies make a relative rotation.
  • the elastic pressure unit comprises an enclosed holding chamber with one side thereof opened, an elastic member made of rubber and a contact element having a proximal portion abutted against the rubber elastic member and a rounded distal portion extended outwardly from said one side of the holding chamber.
  • the clutch mechanism of this invention In operation, when the clutch is in a disengaged state while the first and second main bodies slip on each other, the contacting elements of the elastic pressure units slide back and forth on the unevenly configurated portion under pressure due to the deformation of the rubber elastic members. Therefore, with the clutch mechanism of this invention, the contacting portions are not worn out so much and the durability of the clutch is improved as compared with the conventional clutch mechanism in which the surfaces having the projections and depressions of the clutch discs made of relatively hard material. Since the rubber elastic members are held in the enclosed holding chamber, they produce sufficiently strong biasing forces, even when they are made of relatively soft and light material. The biasing forces act as clutch pressure between the radially opposed portions of the first main body on the driving side and the second main body on the driven side.
  • the stable predetermined clutch pressures are produced for a long time. Unlike the conventional clutch, it is unnecessary to build the compressed springs in the clutch so as to form a body with the other elements. Therefore, the number of constituent components and the assembling time are reduced with result that a clutch having a simple structure can be manufactured at a low cost.
  • a clutch for an electrically driven telescopic antenna of this embodiment comprises a driving clutch mechanism A rotated by the driving force of a motor and a driven clutch mechanism B revolved by the rotational force of the driving clutch mechanism A for extending and shortening the antenna.
  • the driving clutch mechanism A comprises a first disc-like main body 10 molded from such as hard synthetic resin and an elastic pressure unit assembly 20 fixed to the first main body 10.
  • the first main body 10 has a central boss 11 and provided on its outer peripheral wall of the disc portion with a gear portion 12 which engages the power transmission gear (not shown) of the motor.
  • the elastic pressure unit assembly 20 comprises three elastic pressure units 21, 22 and 23 (only 21 is shown in the figure) extending radially from the boss 11 of the first main body 10 and separated by 180 degrees from each other in the circumferential direction such that the three elastic pressure units 21 to 23 are arranged radially from the central axis of the first main body 10.
  • Slots for defining the holding chambers are formed in a relatively thick disc 24 at circumferential intervals of 120 degrees and open at the outer peripheral wall of the disc 24.
  • the elastic pressure units 21 to 23 are housed in the corresponding slots.
  • a blocking member 25 is connected with the disc 24 to cover the upper portions of the slots.
  • the elastic pressure assembly 20 and the blocking plate 25 are tightened by bolts 27, 28 and 29 to form a unitary structure and are fitted on the boss 11.
  • the slots covered at their upper portions with the blocking plates 25 form the enclosed holding chambers 51, 52 and 53 (only 51 is shown in the figure). They open only at the outer peripheral wall of the disc 24.
  • the rubber elastic members 31, 32 and 33 are inserted in the corresponding holding chambers 51 to 53.
  • Contacting members 41, 42 and 43 are disposed in the corresponding holding chambers 51 to 53 such that the proximal portions of the contacting members are abutted against the distal portions of the rubber elastic members 31, 32 and 33, and the distal portions thereof are extended outwardly from the outer peripheral wall of the disc 24.
  • flange portions 41a, 41b and 41c are formed for preventing the contacting members 41 to 43 from slipping off the slots.
  • the distal end of each of the contacting members 41 to 43 assumes a semispherical shape.
  • the driven clutch mechanism B composes the second bottomed short hollow cylindrical main body 60 molded from such as hard synthetic resin.
  • the second main body 60 has a central boss 61.
  • On the outer peripheral wall 62 of the second main body 60 is formed a gear portion 63 which engages the rack of a rope (not shown in the figure) for driving the antenna.
  • the inner peripheral wall assumes a hexagonal shape when viewed from the top.
  • the hexagonal inner peripheral wall 64 is an embodiment of the unevenly configurated portion as defined in the claims.
  • This state corresponds to the state in which the driving clutch mechanism A rotates in the direction shown by an arrow M or the driven clutch mechanism B turns in the direction shown by an arrow N.
  • the contacting members 41 to 43 slide on the edges, the contacting members 41 to 43 are retracted in the holding chambers 51 to 53 as shown by the dotted lines in Figs. 1 and 2, and the rubber elastic members 31 to 33 are sufficiently strongly compressed.
  • the driving clutch A is rotated. In other words, the clutch is in the disengaged state and the antenna is disengaged from the motor.
  • the driving clutch mechanism A turns in the opposite direction to that in which the antenna extends.
  • the driven clutch mechanism B is also revolved in the same direction as the driving clutch mechanism A, whereby the antenna is shortened. After the shortening of the antenna has been completed, the clutch is also in the disengaged state. Thereafter, the power source of the motor is cut off, the rotation of the driving clutch mechanism A is stopped, and then the antenna is maintained shortened in the similar manner as the antenna extends.
  • the contacting members 41 to 43 of the elastic pressure units 21 to 23 are moved back and forth by the deformation of the rubber elastic members 31 to 33 and slide on the hexagonal wall portion 64 as the unevenly configurated portion under pressure.
  • the hexagonal wall portion 64 has no specific projections but consists of only plane portions continuously connected with each other. Accordingly, the contacting portions are not worn out so much and the durability is improved as compared with the conventional electrically driven telescopic antenna in which the hard surfaces having the projections and depressions slide on each other under pressure.
  • the rubber elastic members 31 to 33 are held in the enclosed holding chambers 51 to 53, the rubber elastic members have sufficiently strong biasing forces although they are made of relatively soft and light material. These biasing forces produce the clutch pressures between the radially opposed portions of the first main body 10 on the driving side and the second main body 60 on the driven side. Therefore, a stable predetermined clutch pressures are produced for a long time. Still further, since it is unnecessary to provide compressed springs for contacting the clutch discs under pressure, unlike the conventional clutch, many fastening parts such as washers and nuts are not required. This renders the structure of the clutch to be simple and the assembling cost to be low, enabling the clutch to be manufactured at a low cost.
  • the unevenly configurated portion comprises a hexagonal wall portion, it may be polygonal other than hexagonal. Further, the flat planes of the hexagonal wall portion can be changed to radially inwardly inflated curves or can be formed with projections at their central portions to increase the clutching forces.

Landscapes

  • Details Of Aerials (AREA)
EP19890305404 1988-05-31 1989-05-30 A clutch for an electrically driven telescopic antenna Expired - Lifetime EP0345002B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7117688U JPH01174633U (enrdf_load_stackoverflow) 1988-05-31 1988-05-31
JP71176/88U 1988-05-31

Publications (3)

Publication Number Publication Date
EP0345002A2 EP0345002A2 (en) 1989-12-06
EP0345002A3 EP0345002A3 (en) 1991-09-25
EP0345002B1 true EP0345002B1 (en) 1994-10-19

Family

ID=13453093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890305404 Expired - Lifetime EP0345002B1 (en) 1988-05-31 1989-05-30 A clutch for an electrically driven telescopic antenna

Country Status (4)

Country Link
EP (1) EP0345002B1 (enrdf_load_stackoverflow)
JP (1) JPH01174633U (enrdf_load_stackoverflow)
DE (1) DE68918892T2 (enrdf_load_stackoverflow)
ES (1) ES2065379T3 (enrdf_load_stackoverflow)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5068673A (en) * 1990-06-26 1991-11-26 Harada Kogyo Kabushiki Kaisha Clutch device for electrically extensible antennas
JP2508557B2 (ja) * 1991-01-19 1996-06-19 株式会社ヨコオ 電動伸縮アンテナの駆動装置及びその過負荷防止クラッチ機構
JP3134004B2 (ja) * 1991-10-17 2001-02-13 原田工業株式会社 アンテナ伸縮駆動装置
US5841249A (en) * 1995-04-28 1998-11-24 Ut Automotive Dearborn, Inc. Multi-functional apparatus employing an intermittent motion mechanism
US5916327A (en) * 1995-04-28 1999-06-29 Ut Automotive Dearborn, Inc. Multi-functional apparatus employing an electromagnetic device
US5903114A (en) * 1995-04-28 1999-05-11 Ut Automotive Dearborn, Inc. Multi-functional apparatus employing an intermittent motion mechanism
US5920158A (en) * 1995-04-28 1999-07-06 Miller; Robin Mihekun Multi-functional vehicle apparatus
US5949206A (en) * 1995-04-28 1999-09-07 Ut Automotive Dearborn, Inc. Multi-functional apparatus employing an intermittent motion mechanism
US5986351A (en) * 1997-10-09 1999-11-16 Lear Automotive Dearborn, Inc. Bi-directional lever for activating automotive liftgate lock mechanism
US5907199A (en) * 1997-10-09 1999-05-25 Ut Automotive Dearborn, Inc. Electric motor providing multi-directional output
US5917298A (en) * 1997-10-09 1999-06-29 Ut Automotive Dearborn, Inc. Electric motor control system with resistor network for automobile wiper assembly
US5979256A (en) * 1997-10-09 1999-11-09 Ut Automotive Dearborn, Inc. Gear drive window wiper and multi-function electric motor
US5889341A (en) * 1997-10-09 1999-03-30 Ut Automotive Dearborn, Inc. Multi-functional apparatus employing a linear wiper
US6205612B1 (en) 1997-10-09 2001-03-27 Ut Automotive Dearborn, Inc. Window wiper system for an automotive vehicle
US6075298A (en) * 1997-10-09 2000-06-13 Lear Automotive Dearborn, Inc Rotary and linear translation actuator performing multi-functions in an automobile
US5907885A (en) * 1997-10-09 1999-06-01 Ut Automotive Dearborn, Inc. Multi-functional apparatus for use in an automotive vehicle employing multiple tracks
US6026536A (en) * 1997-10-09 2000-02-22 Lear Automotive Dearborn, Inc Range limiting dual direction slip clutch
US5847519A (en) * 1997-10-09 1998-12-08 Ut Automotive Dearborn, Inc. Multi-functional apparatus for a wiper and cable drive
US5929588A (en) * 1997-10-09 1999-07-27 Ut Automotive Dearborn, Inc. Electric motor control system for automobile wiper assembly
US5924324A (en) * 1997-10-09 1999-07-20 Ut Automotive Dearborn, Inc. Movable gear drive windshield wiper
US5920949A (en) * 1997-10-09 1999-07-13 Ut Automotive Dearborn, Inc. Rocking wiper mechanism
US5920159A (en) * 1997-10-09 1999-07-06 Ut Automotive Dearborn, Inc. Multi-functional apparatus employing a flexible drive element for selectively actuating multiple output systems
US6003193A (en) * 1997-10-09 1999-12-21 Lear Automotive Dearborn, Inc. Multi-functional apparatus having flexible clutch
US5977678A (en) * 1997-10-09 1999-11-02 Ut Automotive Dearborn, Inc. Magnetic coupling mechanism for use in an automotive vehicle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942338A (en) * 1974-03-04 1976-03-09 Excel Corporation Torque limiting coupling
JPS5478092A (en) * 1977-12-05 1979-06-21 Hitachi Ltd Lateral semiconductor device
US4606443A (en) * 1983-11-30 1986-08-19 Harada Industry Co., Ltd. Planetary drive with overload clutch release means for an antenna
US4704095A (en) * 1985-10-10 1987-11-03 Societe Acc El Radial action torque limiter

Also Published As

Publication number Publication date
ES2065379T3 (es) 1995-02-16
EP0345002A3 (en) 1991-09-25
DE68918892D1 (de) 1994-11-24
DE68918892T2 (de) 1995-02-23
EP0345002A2 (en) 1989-12-06
JPH01174633U (enrdf_load_stackoverflow) 1989-12-12

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