EP0259821B1 - Drehwiderstand - Google Patents

Drehwiderstand Download PDF

Info

Publication number
EP0259821B1
EP0259821B1 EP87113071A EP87113071A EP0259821B1 EP 0259821 B1 EP0259821 B1 EP 0259821B1 EP 87113071 A EP87113071 A EP 87113071A EP 87113071 A EP87113071 A EP 87113071A EP 0259821 B1 EP0259821 B1 EP 0259821B1
Authority
EP
European Patent Office
Prior art keywords
base member
screw
axis
rotation
rotary body
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
EP87113071A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0259821A2 (de
EP0259821A3 (en
Inventor
Gerhard Spiller
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.)
Preh GmbH
Original Assignee
Preh GmbH
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 Preh GmbH filed Critical Preh GmbH
Publication of EP0259821A2 publication Critical patent/EP0259821A2/de
Publication of EP0259821A3 publication Critical patent/EP0259821A3/de
Application granted granted Critical
Publication of EP0259821B1 publication Critical patent/EP0259821B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/14—Adjustable resistors adjustable by auxiliary driving means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path

Definitions

  • the invention relates to a rotary resistor, in which a rotary body is rotatably mounted on a base body carrying a resistance track, which is axially clamped to produce a frictional torque when rotating with the base body and to which a tapping element resting on the resistance track is fastened.
  • DE-GM 78 15 934 describes a rotational resistance of the above type. Its arrangement is dimensioned extremely small in accordance with its typical use as a volume control in hearing aids.
  • the rotating body With such a resistance, the rotating body is axially clamped to the base body by riveting or flanging.
  • the resulting friction torque when turning the rotating body is not adjustable within narrow limits, but more or less a random result.
  • the resistance path is in the form of an annular surface extending radially to the axis of rotation in the base body.
  • the resilient tapping element is kept pressed onto the resistance track by the riveting or flanging.
  • the axial bracing of the rotating body with the base body and the pressing force of the tapping member are in an inseparable relationship. An increase in the axial clamping force is thus associated with a corresponding increase in the pressing force of the tapping member; the same applies in the reverse case.
  • a threaded pin is attached to the base body, with which the rotational resistance can be fixed on a base plate.
  • the threaded pin can also serve as an electrical connection.
  • the rotating part is axially clamped with respect to the base body with a pin and a snap ring.
  • the friction torque achieved depends on various uncertainty factors, so that it can hardly be determined exactly.
  • a switch is installed under the rotary body within the resistance ring, which switch the rotary body actuates by its rotary movement (DE-B-1 086 792).
  • the rotating body is equipped with a coaxial hollow cylinder directed against the base body, the end face of which controls the switching contact held on the base body.
  • the distance of the rotating body from the base body is decisive for the functioning of the switch, it can be set using an axis spindle. As far as this setting causes a frictional moment of the rotating body or a pressing force of the tapping element on the resistance track, these are random.
  • the rotating body is rotatably mounted on the axis spindle by means of a screw.
  • the object of the invention is to propose a rotational resistance of the type mentioned, in which a friction torque occurring when the rotating body rotates, even with small dimensions of the rotational resistance, and without changing the pressing force of the tap on the resistance track, is easily adjustable and adjustable.
  • the force with which the rotating body is pressed onto the base body can be adjusted by tightening the screw more or less firmly.
  • the frictional torque that occurs when the base body is rotated can thereby be set precisely. It is also favorable that if the frictional torque is initially set too high, this can be reduced by slightly loosening the screw.
  • the resistance path extends coaxially about the axis of rotation and the tap in Axis of rotation in the radial direction presses on the resistance track.
  • the pressing force of the tap member thus acts transversely to the force with which the rotating body is pressed onto the base body. This ensures that the forces are independent of each other. It is thus possible to achieve a high frictional torque without the pressing force of the tapping element on the resistance track also becoming correspondingly high.
  • a rotary resistor (1) has a plastic base body (2) in which a cylindrical interior (3) is formed.
  • a resistance track (5) runs around the inside of the cylindrical wall (4) of the interior (3). Both ends of which are connected to connecting pins (6, 7) around which the base body (2) is injection molded.
  • a metallic sleeve (8) is attached to the base body (2) concentrically with the wall (4). This can be fastened to the base body (2) by injecting the plastic compound forming it around the sleeve (8) during its manufacture.
  • the sleeve (8) has an internal thread (9). In this the shaft (10) of a screw (11) is screwed, the head of which is designated (12).
  • a rotating body (13) is mounted on the base body (2) about a rotating axis (14) coinciding with the axis of the screw (11).
  • the rotating body (13) has a base (15) with an opening (16) for the screw (11) and an annular rim (17).
  • a plurality of projections (18) for actuating the rotating body (13) are formed on the outside of the ring edge (17).
  • a cover (19) covering the screw head (12) is snapped onto the rotating body (13).
  • the ring edge (17) overlaps the wall (4). It is guided radially to the axis of rotation (14) by a step (20) rotating around it. With its end face (21), the ring edge (17) lies against an annular surface (22) of the base body (2).
  • a holder (23) for a tap member (24) is formed on the base (15).
  • the tap member (24) rests with its one end (25) radially resiliently on the resistance track (5). With its other end (26) it also rests radially resiliently on the sleeve (8).
  • the desired friction torque when turning the rotating body (13) is set as follows: After placing the rotating body (13) on the base body (2), the screw (11) is screwed into the sleeve (8) until its head (12) presses on the floor (15). The screw (11) is then tightened so that the end face (21) of the ring rim (17) presses so strongly on the ring surface (22) of the base body (2) as is necessary for the actuating torque required for rotating the rotating body (13) is. The pressing force of the ends (25, 26) of the tapping member (24) on the resistance track (5) or the sleeve (8) does not change.
  • the shaft (10) of the screw (11) projects beyond the base body (2) with a section (27) (cf. FIGS. 1 and 3).
  • a pin (28) is formed on the base body (2) in addition to the section (27) to prevent rotation.
  • the resistor (1) with the section (27) and the pin (28) is inserted into a corresponding recess in a base plate (29).
  • the section (27) extends through the base plate (29), so that the rotational resistance (1) is screwed onto the section (27) by means of a nut (30) on the base plate (29).
  • an electrical guide surface (31) or another electrical connection is provided on the base plate (29).
  • an electrical connection is made to the tap member (24) by means of the nut (30) via the screw (11), the metallic sleeve (8) and the end (26).
  • the screw (11) fulfills several functions. It holds the rotating body (13) on the base body (2). It ensures the necessary contact pressure between the end face (21) and the ring face (22). It serves to mechanically hold the rotary resistor (1) on the base plate (29) and it forms the electrical connection of the tapping element (24).

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
EP87113071A 1986-09-12 1987-09-08 Drehwiderstand Expired - Lifetime EP0259821B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863631056 DE3631056A1 (de) 1986-09-12 1986-09-12 Drehwiderstand
DE3631056 1986-09-12

Publications (3)

Publication Number Publication Date
EP0259821A2 EP0259821A2 (de) 1988-03-16
EP0259821A3 EP0259821A3 (en) 1989-07-26
EP0259821B1 true EP0259821B1 (de) 1992-01-08

Family

ID=6309435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113071A Expired - Lifetime EP0259821B1 (de) 1986-09-12 1987-09-08 Drehwiderstand

Country Status (6)

Country Link
US (1) US4816801A (es)
EP (1) EP0259821B1 (es)
JP (1) JPS6373602A (es)
DE (1) DE3631056A1 (es)
DK (1) DK165610C (es)
ES (1) ES2029465T3 (es)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01129804U (es) * 1988-02-26 1989-09-04
DE4122789C1 (en) * 1991-07-10 1993-01-21 Leopold Kostal Gmbh & Co Kg, 5880 Luedenscheid, De Actuating element for adjusting heating, headlamps, dashboard illumination, etc. in vehicle - has potentiometer surrounded by flat bronze strip fixed to housing at least in one region
JP3367787B2 (ja) * 1995-05-29 2003-01-20 株式会社村田製作所 可変抵抗器
DE19533991B4 (de) * 1995-09-14 2009-07-02 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Potentiometer
DE19720543C1 (de) * 1997-05-16 1998-05-20 Preh Elektro Feinmechanik Elektrischer Drehwiderstand
TWI571890B (zh) * 2015-12-18 2017-02-21 台灣艾華電子工業股份有限公司 旋轉式可變電阻器
CN106935343B (zh) * 2015-12-30 2019-03-26 台湾艾华电子工业股份有限公司 旋转式可变电阻器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127957A1 (en) * 1983-05-27 1984-12-12 Waters Manufacturing, Inc. Wiper for sliding electrical contact

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10118C (de) * C. AD. ED. ALEXANDER in Berlin Tischbett
US1693009A (en) * 1925-01-26 1928-11-27 Benjamin Electric Mfg Co Rheostat
US2329949A (en) * 1941-11-12 1943-09-21 Sonotone Corp Rheostat device
US2451241A (en) * 1946-11-21 1948-10-12 Gen Electric Shielded volume control and switch
US2884506A (en) * 1956-03-12 1959-04-28 Carter Mfg Corp Variable resistor
US2901720A (en) * 1956-07-20 1959-08-25 Plessey Co Ltd Circuit breakers
DE1086792B (de) * 1956-07-20 1960-08-11 Plessey Co Ltd Drehwiderstand mit Ausschalter
DE1826686U (de) * 1960-05-18 1961-02-16 Preh Elektro Feinmechanik Knopfregler.
US3032734A (en) * 1960-07-05 1962-05-01 Globe Union Inc Resistance trimmer knob
NL297808A (es) * 1962-09-12
DE1490258B2 (de) * 1964-10-26 1970-08-06 Rosenthal Isolatoren GmbH, 8672 Selb Miniaturpotentiometer
DE1921230A1 (de) * 1969-04-25 1971-02-25 Resista Fabrik Elek Scher Wide Potentiometer,insbesondere Trimmer
DE7815934U1 (de) * 1978-05-27 1978-09-07 Wilhelm Ruf Kg, 8000 Muenchen Knopfdrehwiderstand
US4430634A (en) * 1982-01-18 1984-02-07 Cts Corporation Rotary potentiometer with molded terminal package

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127957A1 (en) * 1983-05-27 1984-12-12 Waters Manufacturing, Inc. Wiper for sliding electrical contact

Also Published As

Publication number Publication date
DE3631056A1 (de) 1988-03-24
ES2029465T3 (es) 1992-08-16
EP0259821A2 (de) 1988-03-16
DK477387A (da) 1988-03-13
US4816801A (en) 1989-03-28
EP0259821A3 (en) 1989-07-26
JPS6373602A (ja) 1988-04-04
DK477387D0 (da) 1987-09-11
DK165610C (da) 1993-05-03
DK165610B (da) 1992-12-21
DE3631056C2 (es) 1991-03-14

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