US3900816A - Electromagnetic driven variable resistance device - Google Patents

Electromagnetic driven variable resistance device Download PDF

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Publication number
US3900816A
US3900816A US518950A US51895074A US3900816A US 3900816 A US3900816 A US 3900816A US 518950 A US518950 A US 518950A US 51895074 A US51895074 A US 51895074A US 3900816 A US3900816 A US 3900816A
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Prior art keywords
resistance device
pair
case
driving
pawl
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Expired - Lifetime
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US518950A
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English (en)
Inventor
Tetsuhiro Kiyono
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Alps Alpine Co Ltd
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Alps Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/14—Adjustable resistors adjustable by auxiliary driving means

Definitions

  • Kiyono ELECTROMAGNETIC DRIVEN VARIABLE RESISTANCE DEVICE [75 ⁇ Inventor: Tetsuhiro Kiyono, WakuyaJapan Japan [73] Assignee: Alps Electric Co., Ltd., Tokyo,
  • An electromagnetic driven variable electrical resistance device has a variable resistor mounted onto the front side of a case and provided with a rotatable shaft to which a drive-gear is attached.
  • a pair of solenoids are mounted onto the bottom panel portion of the case.
  • a pair of movable driving-pawl members are pivotally supported by the recess portions of an E-shaped spacer attached to the case and are biased by a pair of spring'means and held in an upper limit position by a T-shaped stopper plate.
  • each driving-pawl member is positioned above each solenoid respectively
  • the T-shaped stopper plate has a central projecting blade-portion borne by the rotatable shaft of variable resistor.
  • Each of the movable driving-pawl members is twisted.
  • the E-shaped spacer is made of non-metallic material and has a thin central flap-portion and a pair of thick side flap-portions.
  • This invention relates to a variable resistance device, and more particularly to a variable resistance device adapted for remote control and driven by an electromagnetic mechanism.
  • variable resistance device which can be operated remotely as well as manually.
  • a currently popular remote control system makes use of pulsative control signals typically transmitted by ultrasonic means. Therefore it is required that such a variable resistance device have a mechanism discretely driven by remote control means, and be able to complete the reciprocating action necessary for each discrete drive-step, accurately at a considerably high speed, and in accordance with each remote control pulse-signal.
  • the variable resistance device must be of a simple and compact construction.
  • An objective of this invention is to provide an electromagnetic drive-variable resistance device able to fulfill the above-described requirements.
  • a further objective of this invention is to provide an electromagnetic driven variable resistance device having an electromagnetic gear-drive mechanism in which the reciprocating action of driving-pawl members is completed smoothly at high speed in accordance with each of remote control pulse-signals.
  • an electromagnetic driven variable resistance device comprises a case, a variable resistor mounted onto the front face of the case, a drive-gear attached to the rotatable shaft of the variable resistor, a pair of solenoids mounted onto the bottom panel portion of the case, a pair of movable driving-pawl members of magnetic material which are pivotally mounted in the recess portions of E-shaped spaces and have a wide blade portion positioned above each solenoid respectively.
  • a T-shaped stopper plate, for position-limitation of the movable driving-pawl members, is attached to the case.
  • the drive-gear is rotated intermittently when either of the movable driving-pawl members is moved to strike a tooth of the drive-gear by the driving-pawl-portion thereof.
  • the T- shaped stopper plate has a central projecting bladeportion which is borne by the rotatable shaft of the variable resistor so as to secure a predetermined movement-distance of the movable driving-pawls.
  • the driving pawl-portion of each of the movable driving-pawl members which engages with the drive-gear, is twisted so that the driving pawlportion contacts with a tooth of the drive-gear by a lessened contact-area on the way of returning-action thereof, that causes a decrease in friction and therefore results in the smooth retumingaction of the driving-pawl member.
  • the E-shaped spacer is made of nonmetallic material so as to decrease operational noise and is made to have a thin center flap-portion and a pair of thick side flap-portions so as to permit the movable driving-pawl members to return to a correct position for the next driving-action thereof.
  • FIGS. 1 to 8 illustrate a preferred embodiment of the electromagnetic driven variable resistance device according to this invention:
  • FIG. 1 is a side view thereof
  • FIG. 2 is a partially sectional side view thereof
  • FIG. 3 is a rear view thereof
  • FIG. 4 is a top plan view thereof
  • FIG. 5 is a sectional view thereof taken along lines A, A in FIG. 4;
  • FIG. 6 is a sectional view of a part thereof for illustrating the relationship between the solenoid and the movable driving-pawl member
  • FIG. 7 is a perspective view thereof, partially broken away, for illustrating the mounting-state of the movable driving-pawl member.
  • FIG. 8 is a schematic diagram for illustrating the operation thereof.
  • FIG. 9 illustrates another embodiment of the electromagnetic driven variable resistance device according to this invention.
  • FIGS. 1 to 8 in which there is shown an embodiment of the electromagnetic driven variable resistance device according to this invention, a case 1 having a rectangular shape which is constructed of sheet metal which is bent into the form shown.
  • Variable resistor 2 is mounted onto the face panel-portion la of case I and comprises a cover 3, in which a resistance element and a sliding tap (not shown) are mounted, and a rotatable shaft 5 which has a projecting portion 4 projecting rearwardly through cover 3.
  • the value of the resistance of variable resistor 2 is varied by rotating the shaft 5.
  • Drive-gear 6 is fixedly mounted onto projecting portion 4 of rotatable shaft 5, so that the gear 6 rotates along with shafts.
  • the drive gear 6 is made of, for example, synthetic plastic resin.
  • a pair of solenoids 7 and 7' are mounted onto the bottom panel-portion 1c of case 1 and are parallel to the rear panel-portion 1b of case 1.
  • each solenoid 7, 7' is comprised of an iron core 1 1, a cylindrical bobbin 8 of synthetic plastic resin and a wire coil 9 wound onto the bobbin.
  • the pair of winding-ends of coil 9 are respectively connected to a pair of terminals 10 and 10 fixed into bobbin 8.
  • the top flange-portion 1 la of iron core II is received in the expanded opening-portion at the upper end of bobbin 8, as shown in FIG. 6, and the top thereof is slightly lower than the upper edge 8b of bobbin 8.
  • a T-shaped stopper plate 12 of synthetic resin which comprises central projecting blade-portion 12b and a pair of wing-portions 12a and 12a, is attached into case 1 by fitting the ends of wingportions 12a and 12a into slots provided in both sides of panel-portions 1d and 1d of case 1 and by inserting projecting portion 4 of rotatable shaft 5 of variable resistor 2 into the hole of central projecting blade-portion 12b.
  • E-shaped spacer 13 of rubber or other resilient material is attached to case 1 such that the spacer 13 covers the upper portion of rear face panel-portion 1b of case 1 as shown in FIG. 7.
  • Central flap-portion 13a thereof is formed thin and a pair of side flap-portions 13b and 13b are formed thick, and therebetween a pair of recess-portions 13c and 13c are provided.
  • movable driving-pawl members 14 and 14 are formed, for example by stamping, from a plate of magnetic material, such as a steel metal plate.
  • Each driving pawl 14, 14' has a driving-pawl-portion 14a, a wide blade-portion 14b, neck-portion 14c and spring-retaining portion 14d.
  • Each of the movable driving-pawl members 14 and 14 is positioned above each of solenoids 7 and 7
  • the neck-portion 14c thereof being put into recess-portion 130 of spacer l3 and driving-pawl-portion 140 being positioned in recess-portion 120, so that the pawl-end of driving-pawl-portion 14a is set at the position engageable with a tooth of drivegear 6 and wide blade-portion 14b thereof is set at the opposite position to iron core 11 of the corresponding solenoid.
  • Coil springs 15 and 15 are connected between springretaining portion 14d of the corresponding driving-pawl member and projection 1f provided at the side edge of side panel-portion Id of case 1, respectively.
  • each of the movable driving-pawl members 14 and 14' is pivotally biased around recessportion 13c as a pivot, that is; spring-retaining portion 14d is pulled obliquely down toward side panel-portion 1d of case 1 by coil spring 15 with neck-portion 14c acting as a fulcrum, and driving-pawl-portion 14a lifted obliquely upwards and held in an upper limit position by the corner of recess-portion 120 of stopper plate 12.
  • Projections If and 1f of case 1 are formed to have a curved face-portion with a curvature nearly equal to that of ring-hooks 15a and 15a, to prevent deformation of ring-hooks 15a and 15a.
  • driving-pawlportion 140 of movable driving-pawl member 14 is slightly twisted in the counter-clockwise direction and that of movable driving-pawl member 14' in clockwise direction. This decreases friction when driving-pawlportion 14a is removed from drive-gear 6 after driving engagement therewith, thereby securing a more stable rotation of drive-gear 6 and reducing the possibility of improper operation.
  • driving-pawl-portions 14a and 14a of movable drivingpawl-members l4 and 14' are at position X in FIG. 8 so that drive-gear 6 is freely rotatable.
  • Rotatable shaft 5 can be rotated for manual sound control.
  • solenoid 7 is thereby magnetized and will attract movable driving-pawl member 14 downwards and pivotally move it against coil-spring with neckportion 14c acting as a fulcrum, so that driving-pawl-portion 14a thereof falls vertically and then engages a tooth of drive-gear 6 as shown by position Y in FIG. 8.
  • driving-pawl-portion 14a is slightly twisted, the lower face thereof goes in face-contact with the inclined surface K of the tooth. Then, movable driving-pawl member 14 is further pulled down by solenoid 7 thereby moving drivingpawl-position 14a to position Z shown in FIG. 8, to rotate drive-gear 6 one step.
  • rotatable shaft 5 is slightly rotated by the one-step-rotation of drive-gear 6 in the clockwise direction so that sound-volume is slightly increased.
  • driving-pawlportion 14a falls non-vertically from position Y to position Z in H6. 8, that is, its movement defines a circle, with neck-portion 14c acting as a fulcrum, in accordance with the rotation of drive-gear 6.
  • drivingpawl-portion 14a moves to position Z, wide bladeportion 14b of movable driving-pawl member 14 strikes the upper edge 8b of bobbin 8 and driving-pawl-portion 14a is thereby stopped from further falling movement.
  • driving-pawl-portion 14a is in linecontact with the tip of a tooth of drive-gear 6 on the side face thereof, as shown in FIG. 8.
  • driving-pawI-portion 14a of movable driving-pawl-member 14' will rotate drive-gear 6, and thereby rotate shaft 5, in the counter-clockwise direction step by step, so that sound-volume is gradually decreased.
  • driving-pawlportion 14a of each of movable drivingpawl members 14 and 14' is twisted to an angle of such that smooth face T thereof, which is not corresponding to sections S and S made by stamping, comes in contact with the tip of a tooth of drive-gear 6 when returning from driving engagement thereof.
  • stopper plate 12 since stopper plate 12 has a central projecting bladeportion 12b which is borne by projecting portion 4 of rotatable shaft 5, the distance from rotatable shaft 5 to recess-portion 12c of stopper plate 12 will be a fixed length and consequently it will be possible to secure a uniform path of operation of movable driving-pawl members 14 and 14 in the manufacture of the invention to insure stable step by step rotation of drive-gear 6 therein.
  • driving-pawl-portion 14a is so twisted as to make line or smooth contact with a tooth of drive-gear 6 when returning from driving engagement thereof, friction therebetween will be greatly decreased and the returning action of driving-pawlportion 14a will cause no rotation of drive-gear 6. This insures a reliable rotation of drive-gear 6.
  • E-shaped spacer 13 for pivotally supporting movable driving-pawl members 14 and 14' has central flapportion 13a formed thin and both side flap-portions 13b and 131) formed thick, each of movable drivingpawl members 14 and 14 can be biased so that drivingpawl-portions 14a thereof will move toward the center when returning to its upper-limit position, as can be seen in H05. 1 and 8. This will also insure reliable ac tion in each succeeding rotation-step of drive-gear 6.
  • stopper plate 12, bobbin 8 and spacer 13 are made of non-metallic material, it will be possible to decrease operational noises.
  • An electromagnetic driven variable resistance device comprising a case having side walls,
  • variable resistor provided with a rotating shaft and mounted onto one side-face of said case
  • said shaft being rotatable to vary resistance value of said resistance device
  • a pair of movable driving-pawl members made of magnetic material each of which is pivotally mounted in relationship to said solenoid and positioned above said solenoids and able to engage a tooth of said drive-gear so as to rotate said drivegear
  • a variable resistance device as set forth in claim 1, wherein said stopper plate has a central projecting bladeportion which is born by said rotating shaft of said variable resistor.
  • variable resistance device as set forth in claim 1, wherein said movable driving-pawl member is twisted at the driving-pawl-portion thereof which engages with a tooth of said drive gear.
  • variable resistance device as set forth in claim 1, wherein said spacer being an E-shaped.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
US518950A 1973-10-30 1974-10-29 Electromagnetic driven variable resistance device Expired - Lifetime US3900816A (en)

Applications Claiming Priority (1)

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JP48121980A JPS5245904B2 (enrdf_load_stackoverflow) 1973-10-30 1973-10-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390860A (en) * 1981-07-23 1983-06-28 Garvey Steven E Electronically variable resistance device
US5003607A (en) * 1987-06-03 1991-03-26 Reed James S Hearing aid with audible control for volume adjustment
US5376914A (en) * 1992-09-22 1994-12-27 Matsushita Electric Industrial Co., Ltd. Electromotive adjustable resistor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1681924A (en) * 1928-08-28 Electric regulation
US2397922A (en) * 1942-12-07 1946-04-09 Aeronautical & Mechanical Inve Electrical remote control device
US2499200A (en) * 1943-03-25 1950-02-28 Gen Electric Voltage regulating apparatus
US2884504A (en) * 1954-04-12 1959-04-28 Honeywell Regulator Co Electric controllers
US2921284A (en) * 1956-03-23 1960-01-12 Gaynard H Fosdick Function programmers
US3335385A (en) * 1964-07-29 1967-08-08 Beckman Instruments Inc Rectilinear actuator and potentiometer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1681924A (en) * 1928-08-28 Electric regulation
US2397922A (en) * 1942-12-07 1946-04-09 Aeronautical & Mechanical Inve Electrical remote control device
US2499200A (en) * 1943-03-25 1950-02-28 Gen Electric Voltage regulating apparatus
US2884504A (en) * 1954-04-12 1959-04-28 Honeywell Regulator Co Electric controllers
US2921284A (en) * 1956-03-23 1960-01-12 Gaynard H Fosdick Function programmers
US3335385A (en) * 1964-07-29 1967-08-08 Beckman Instruments Inc Rectilinear actuator and potentiometer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390860A (en) * 1981-07-23 1983-06-28 Garvey Steven E Electronically variable resistance device
US5003607A (en) * 1987-06-03 1991-03-26 Reed James S Hearing aid with audible control for volume adjustment
US5376914A (en) * 1992-09-22 1994-12-27 Matsushita Electric Industrial Co., Ltd. Electromotive adjustable resistor

Also Published As

Publication number Publication date
JPS5245904B2 (enrdf_load_stackoverflow) 1977-11-19
DE2450015A1 (de) 1975-05-07
JPS5072165A (enrdf_load_stackoverflow) 1975-06-14
DE2450015B2 (de) 1977-06-08

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