US3328740A - Single pile foot controller - Google Patents

Single pile foot controller Download PDF

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Publication number
US3328740A
US3328740A US496768A US49676865A US3328740A US 3328740 A US3328740 A US 3328740A US 496768 A US496768 A US 496768A US 49676865 A US49676865 A US 49676865A US 3328740 A US3328740 A US 3328740A
Authority
US
United States
Prior art keywords
base
pressure
pile
contact
actuator
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
US496768A
Other languages
English (en)
Inventor
Ronald R Thompson
Alan H Stolpen
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.)
Singer Co
Original Assignee
Singer Co
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 Singer Co filed Critical Singer Co
Priority to US496768A priority Critical patent/US3328740A/en
Priority to DE19661563761 priority patent/DE1563761B2/de
Priority to FR79791A priority patent/FR1496527A/fr
Priority to GB45973/66A priority patent/GB1118550A/en
Priority to SE14094/66A priority patent/SE347391B/xx
Priority to BR183735/66A priority patent/BR6683735D0/pt
Priority to CH1494066A priority patent/CH445612A/de
Application granted granted Critical
Publication of US3328740A publication Critical patent/US3328740A/en
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
    • H01C10/10—Adjustable resistors adjustable by mechanical pressure or force
    • H01C10/12—Adjustable resistors adjustable by mechanical pressure or force by changing surface pressure between resistive masses or resistive and conductive masses, e.g. pile type
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
    • G05G1/30—Controlling members actuated by foot
    • G05G1/38—Controlling members actuated by foot comprising means to continuously detect pedal position
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/28—Manual switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20888—Pedals

Definitions

  • Controllers of this general type are particularly adapted for controlling electric sewing machine motors and are well known in the art as shown, described and claimed in United States Patents No. 2,371,772, granted to J. M. Naul on Mar. 20, 1945, No. 2,384,772, granted to C. R. Schenk on Sept. 11, 1945 and No. 2,536,012, granted to E. P. Turner on Dec. 26, 1950; all assigned to the same assignee as is the present application.
  • An object of the present invention is to provide an improved variable resistance controller of simple and rugged construction which is not readily subject to malfunction.
  • Another object of the present invention is to provide a controller with a carbon pile resistance element and a single leaf spring actuator for varying the resistance of the carbon pile as a function of deflection of the actuator.
  • Still another object of the present invention is to provide a controller with a carbon pile resistance element in fixed position therein and a single leaf spring actuator retained at its ends and having a transversely bent portion providing a pressure face deflectable for varying the pressure applied to the carbon pile for varying the resistance derived therefrom.
  • Another object of the present invention is to provide the foregoing controller in which the actuator thereof may be formed from a single sheet of metallic material or may be constructed from two pieces of standard strip stock.
  • the present invention contemplates a controller for electric motors, comprising a base, a carbon pile resistor connected to the base and supported thereby, a leaf spring actuator connected at its ends to the base and constructed to provide a transverse pressure face adjacent one end in contact with the carbon pile for applying pressure thereto, and means engaging the actuator intermediate the pressure face and the end opposite from such face for deflecting the actauto-r to vary the pressure applied thereto and the resistance derived therefrom.
  • FIGS. 1 and 2 are top plan and side elevation views
  • FIG. 3 is an enlarged plan view of the novel controller of FIGS. 1 and 2 with the casing cover swung away to expose the component parts enclosed therein,
  • FIG. 4 is a longitudinal sectional view taken on line 4-4 of FIG. 3 with the casing cover disposed in its normal position for operation
  • FIGS. 5 and 6 are lateral sectional views taken on lines 5-5 and 66, respectively, of FIG. 3 with the casing cover disposed in its normal position for operation,
  • FIG. 7 is an enlarged fragmentary sectional view taken on line 7-7 of FIG. 3 illustrating a carbon pile pressure adjusting means
  • FIG. 8 is a perspective view of the novel carbon pile pressure actuator
  • FIG. 9 is a perspective view of a modified form of the pressure actuator shown in FIG. 8.
  • a controller may have a casing comprising a hollow cover or foot pedal 10 pivotally connected along its rear edge to the rear edge of a hollow base 11 by a pair of spaced hinges as shown in FIG. 3.
  • Cover 10 and base 11 are of a substantially rigid non-conductive or insulating material, such as a synthetic resin, and are prefer-ably molded to provide various mounting surfaces, recesses and protuberances required for installing various components, as hereinafter will be discussed.
  • a controller casing of the above type is shown and described in a copending United States patent application Ser. No. 490,590, filed Sept. 27, 1965, and assigned to the same assignee as the present invention and to which reference may be had for a more complete understanding thereof.
  • a variable resistance element 13 is disposed in the rear portion of base 11, being supported at its ends and clamped in position by a finger type sheet metal retainer 16 connected to the base 11 by a single threaded fastener.
  • Resistance element 13 is preferably of the carbon pile type comprising a rigid insulating sleeve 14, of ceramic or other acceptable dielectric material, which houses a carbon disc pile 15.
  • a pair of elongated leaf spring contacts 17 and 19 are disposed one above the other in base 11, forwardly of and substantially parallel to resistance element 13.
  • Contact 17 is supported at its ends by base 11, and is provided with a terminal 18 at one of its supported ends.
  • Contact 19, shorter than contact 17, is provided with a terminal 20 at one end and may be rolled at its other end 21.
  • a block 22 is disposed between the terminal ends of contacts 17 and 19 for spacing the contacts and supporting the terminal end of contact 19.
  • the rolled contact end 21 is disposed in spaced relation with and is free to move into and out of engagement with contact 17 when contact 19 is deflected.
  • Contact 17 is supported at its free end by a boss 46 formed on the base 11. This double support for contact 17 enables it to exert a stronger pressure with less material than by other means and still permit over-travel of the cover 10 after full speed operation is reached.
  • a pair of insulated conductors 24 and 25, of a controlled motor circuit enter base 11 through an elongated tubular'insulating grommet 26 and are connected to terminals 17 and 19, respectively, by-the respective terminals 18 and 20.
  • terminals 18 and 20 are each shown as comprising a nut and bolt, in accordance with common practice, each such bolt may thre'adedly engage the associated contact.
  • contacts 17 and 19 provide a normally open circuit switch which is closed
  • a pressure adjustment element 29 is threadedly supported by bracket 27 and has a U-spring portion 47 which engages the adjacent end of the carbon pile 15 to transmit pressure thereto and to complete an electric connection from resistance element 13 to conductor 24 through bracket 27 and terminal 18.
  • Element 29 moves axially, when threaded into 27, to vary and adjust initial resilient pressure on carbon pile 15 to derive desired resistance from element 13 when the controller is in its unoperated condition and provides, through U-spring portion 47, means for compensating changing lengths of pile 15 due to heating and wear.
  • the U-spring 47 provides a resilient stop for the pile 15 which, for initial operational movement of the cover 10, effects a low rate of pressure buildup on the pile 15 which greatly improves the low speed control capability.
  • a leaf spring type actuator 30 is provided in base 11 for varying pressure applied to the carbon disc pile 15 in response to movement or actuation of the cover or foot pedal 10. More specifically, actuator 30 is formed to provide a pressure face or portion 31 disposed across the end of element 13, opposite from adjustment element 29, and in contact with the carbon pile 15, Pressure face 31 has a flange 32 extending from its bottom edge that is connected to base 11, and an elongated spring leg 33 extending from its upper edge, substantially parallel to and offset from element 13, over contact 19 toward terminals 18 and 20.
  • actuator 30 is merely an elongated leaf spring having an enlarged portion 31 adjacent one end and is formed or bent so the portion 31 is disposed in a transverse plane and offsets flange 32 from leg 33 along such transverse plane.
  • a block 35 is disposed between the end of leg 33 and the terminal end of contact 19 to space the free contact end 21 from leg 33.
  • a threaded fastener 36 is provided to clamp, with blocks 22 and 35, the end of leg 33 and the terminal ends of contacts 17 and 19 to base 11.
  • blocks 22 and 35 are also insulators between leg 33 and contacts 17 and 19, and have keys extending through the said contacts to provide an interlock with base 11.
  • One such key on each side of block 22 provides insulation for fastener 36 from contacts 17 and 19.
  • a flange 34 may be provided along the edges of the pressure face 31 between flange 32 and leg 33 for added rigidity, and another such flange may be provided at the end of leg 33 which extends into block 35 for positive interlock. It should be readily understood that leg 33 and contact 19 provide a normally open circuit switch in series with resistance element 13 to prevent unnecessary heating of the element 13 when the controller is unoperated and to disconnect electrically the controller from the electrical supply line as a safety feature.
  • block 35 is slidable to a degree with respect to block 22 and movement of block 35 compensates for linear and angular tolerance buildup and provides a coarse pile pressure adjustment.
  • FIG. 9 A modified form of the actuator 30 of FIG. 8 is shown in FIG. 9.
  • the parts having similar function to those of FIG. 8 carry the same reference numbers.
  • the actuator 30 may be made in two parts 31 and 33, spot welded together and this may be desirable as a lower cost item since standard strip stock can be used in this form.
  • the end of the leg 33 may be anchored to the block 35 by projections 50 formed in the block 35 and engaged by simple apertures made in the leg 33 as shown, If desired, a contact 51, preferably made of carbon, may be secured to the pressure portion 31 by a push nut, 52 pushed onto a reduced diameter thereof.
  • Cover or foot pedal has a pressure pad 37 which engages leg 33, intermediate its ends and above the free end 21 of contact 19.
  • a spring 38 is provided in the front portion, at each end, of the casing for biasing the cover 10 to pivot away from base 11.
  • the springs 38 are pressed over raised bosses 44 on the inner surface of the cover 10.
  • the spring dimensions are such that the springs 38 hold themselves in place by helical contraction around the bosses 44 and are thus self-retaining.
  • the springs 38 are guided to their flat seats by the sides of conical recesses 45 formed in the base 11. As best seen in FIG.
  • cover 10 may have a plurality of parallel grooves 42 in its outer surface, and a friction pad 43 may be applied to the bottom surface of base 11.
  • the characteristic of the pile resistance as a function of pile pressure is non-linear with the resistance change rate being large at low pressures and small at high pressures.
  • the characteristic of the pile pressure as a function of cover movement is also non-linear with the pressure change rate being small at the beginning of cover movement and increasing with further cover movement.
  • Contact 19 is common to both the resistance and bypass flow paths between conductors 24 and 25, and is deflected simultaneously with leg 33 when the resistance path is established.
  • Leg 33 and contact 19 approach maximum deflection, in response to movement of pedal 10, as resistance of carbon pile 15 approaches its minimum. Further movement of pedal 10 causes leg 33 to completely deflect, and the free end 21 of contact 19 to engage contact 17 to establish the bypass path for maximum speed operation of the controlled motor (not shown).
  • Contacts 17 and 19 and actuator 30 are stamped or cut from sheet metal and then formed and thus are reduced to their simplest single leaf spring form to substantially eliminate malfunction and wear normally attendant with assemblies of movable actuating parts. Further stated, a carbon pile resistor is provided with an actuator for varying the pressure applied to the carbon pile and vary the resistance derived therefrom as a function of deflection of the actuator.
  • a controller for electric motors comprising:
  • the bent portion being formed with an oflset pressure portion in contact with one end of the pile resistor for applying pressure thereto;

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Adjustable Resistors (AREA)
US496768A 1965-10-18 1965-10-18 Single pile foot controller Expired - Lifetime US3328740A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US496768A US3328740A (en) 1965-10-18 1965-10-18 Single pile foot controller
DE19661563761 DE1563761B2 (de) 1965-10-18 1966-10-12 Fussgeschwindigkeitsregler
FR79791A FR1496527A (fr) 1965-10-18 1966-10-13 Dispositif de commande de la vitesse d'un moteur électrique
GB45973/66A GB1118550A (en) 1965-10-18 1966-10-14 Single pile foot controller
SE14094/66A SE347391B (enExample) 1965-10-18 1966-10-17
BR183735/66A BR6683735D0 (pt) 1965-10-18 1966-10-17 Reostato de pe com uma sopilha de carvao
CH1494066A CH445612A (de) 1965-10-18 1966-10-17 Drehzahlregler für einen Elektromotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US496768A US3328740A (en) 1965-10-18 1965-10-18 Single pile foot controller

Publications (1)

Publication Number Publication Date
US3328740A true US3328740A (en) 1967-06-27

Family

ID=23974052

Family Applications (1)

Application Number Title Priority Date Filing Date
US496768A Expired - Lifetime US3328740A (en) 1965-10-18 1965-10-18 Single pile foot controller

Country Status (7)

Country Link
US (1) US3328740A (enExample)
BR (1) BR6683735D0 (enExample)
CH (1) CH445612A (enExample)
DE (1) DE1563761B2 (enExample)
FR (1) FR1496527A (enExample)
GB (1) GB1118550A (enExample)
SE (1) SE347391B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5319996A (en) * 1993-08-13 1994-06-14 Kransco Debris resistant foot pedal switch assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371772A (en) * 1942-12-08 1945-03-20 Singer Mfg Co Motor controller
US2384772A (en) * 1943-05-26 1945-09-11 Singer Mfg Co Sewing machine motor controller
US2536012A (en) * 1949-04-01 1950-12-26 Singer Mfg Co Carbon pile rheostat
US2561556A (en) * 1948-05-08 1951-07-24 Irving J Moritt Rheostat
US2620419A (en) * 1950-08-25 1952-12-02 Sharenow Rheostat
US2988720A (en) * 1957-08-12 1961-06-13 Peter H Voorias Electrical control rheostat

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371772A (en) * 1942-12-08 1945-03-20 Singer Mfg Co Motor controller
US2384772A (en) * 1943-05-26 1945-09-11 Singer Mfg Co Sewing machine motor controller
US2561556A (en) * 1948-05-08 1951-07-24 Irving J Moritt Rheostat
US2536012A (en) * 1949-04-01 1950-12-26 Singer Mfg Co Carbon pile rheostat
US2620419A (en) * 1950-08-25 1952-12-02 Sharenow Rheostat
US2988720A (en) * 1957-08-12 1961-06-13 Peter H Voorias Electrical control rheostat

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5319996A (en) * 1993-08-13 1994-06-14 Kransco Debris resistant foot pedal switch assembly
WO1995005628A1 (en) * 1993-08-13 1995-02-23 Mattel, Inc. Debris resistant foot pedal switch assembly
AU676765B2 (en) * 1993-08-13 1997-03-20 Mattel, Inc. Debris resistant foot pedal switch assembly

Also Published As

Publication number Publication date
DE1563761A1 (de) 1970-04-16
BR6683735D0 (pt) 1973-12-27
DE1563761B2 (de) 1972-02-17
CH445612A (de) 1967-10-31
GB1118550A (en) 1968-07-03
SE347391B (enExample) 1972-07-31
FR1496527A (fr) 1967-09-29

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