US2117257A - Rheostat - Google Patents

Rheostat Download PDF

Info

Publication number
US2117257A
US2117257A US35913A US3591335A US2117257A US 2117257 A US2117257 A US 2117257A US 35913 A US35913 A US 35913A US 3591335 A US3591335 A US 3591335A US 2117257 A US2117257 A US 2117257A
Authority
US
United States
Prior art keywords
rheostat
pull
lever
rod
casing
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
US35913A
Other languages
English (en)
Inventor
Carl R Schenk
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 US35913A priority Critical patent/US2117257A/en
Priority to GB10217/36A priority patent/GB457254A/en
Priority to FR805503D priority patent/FR805503A/fr
Priority to DES122661D priority patent/DE674201C/de
Priority to AT149296D priority patent/AT149296B/de
Priority to CH188136D priority patent/CH188136A/de
Application granted granted Critical
Publication of US2117257A publication Critical patent/US2117257A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/30—Details
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/02—Details of starting control

Definitions

  • control mechanism and adapt it for mounting in' a casing of molded phenolic condensation material which thoroughly insulates the rheostat and eliminates all danger of electric shock to the operator.
  • the invention comprises the devices, combinations, and arrangements of l parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.
  • Fig. 1 is a longitudinal vertical section through a rheostat embodying the invention.
  • Fig. 2 is a top plan view of the rheostat.
  • Fig. 3 is a section on the line 33, Fig. 2.
  • Fig. 4 is a section on the line 4 4, Fig. 2.
  • Fig. 5 is a. plan view of the base member of the rheostat casing with the rheostat unit and its operating mechanism mounted thereon.
  • Fig. 6 is a fragmentary bottom plan view of the rheostat.
  • Fig. 7, is a fragmentary bottom plan view of the cover member of the rheostat casing.
  • Fig. 8 is a section on the line 88, Fig. 2.
  • Fig. 1 is a longitudinal vertical section through a rheostat embodying the invention.
  • Fig. 2 is a top plan view of the rheostat.
  • Fig. 3 is a section on the line 33, Fig
  • Fig. 9 is a perspective view of one of the feet of the rheostat.
  • Fig. 10 is a perspective view of the fulc'rum support and recovery spring anchorage horns of the rheostat operating lever.
  • Fig. 11 is a. section on the line II-II, Fig. 7.
  • Fig. 12 is a perspective view of the pedal slideblock.
  • Fig. 13 is a longitudinal vertical section through a modified form of rheostat adapted for mounting on the frame of a sewing machine treadlestand and for connection by a. pull-rod to the treadle of such stand.
  • Fig.A 14 is a front elevation of the rheostat with the cover broken 50 away to show the operating mechanism.
  • Fig. 15 is a front elevation of the rheostat with the cover broken 50 away to show the operating mechanism.
  • Fig. 16 is a lower end elevation of the rheostat as shown in Fig. 14.
  • Fig. 17 is a longitudinal section of the operating pull-block of the rheostat shown in 55 Figs. 13 and 14.
  • Fig. 18 is an end elevation of the pull-block, and
  • Fig. 19 is a section on the line I9-I9, Fig. 13.
  • the casing comprises a hollow top or cover member A and a bottom or base member B, each of which is preferably molded in one piece from phenolic condensation material or artificial resin, such as bakelite, which does not soften under heat conditions and has good mechanical strength and high electrical insulating properties.
  • the top member A is preferably of hollow rectangular form and comprises a top Wall I and side walls 2 which latter are formed with internal corner ledges 3.
  • the bottom member B is .substantially flat and preferably of rectangular form and is detachably secured to the top member A, within the side walls 2 of the latter, by means of the corner screws 4 which are screwed into the ledges 3.
  • the bottom member B has rounded corners 5 which are spaced from the rounded internal corner walls 6 of the top member A to form pockets to receive and position the vertical shank 'I of the rubber feet C.
  • the Shanks 'I of the feet C have flanges 8 at their upper ends overlapping the bottom member B and these ilanges are clamped by and between the bottom member B and the ledges 3 of the top member A.
  • the feet C may have at their lower ends the tread portions 9 which may be of annular form and which may underlap the bottom member B.
  • rheostat unit I I Mounted on the base member B by means of screws i0 is the usual carbon compression type rheostat unit I I, such as disclosed in the U. S. Patent to Chason, No. 1,643,292; dated Sept. 27, 1927.
  • a rheostat unit comprises a porcelain body having spaced parallel wells housing stacks I2 of carbon disks, which stacks are each connected at one end to a terminal screw I3 and at its opposite end to a conducting pressure head I4.
  • the pressure heads I4 are bridged by a Weak bow-spring i5 carried by the operating pull-rod I6 which also carries the stiffer backing spring I'I.
  • the pull-rod I6 is surrounded by the coiled recovery spring I8 which tends to return the pull-rod i6 to the off position shown in Fig. 5 in which the Weak bow-spring I5 is out of engagement with the pressure heads I4 and the circuit through the rheostat is broken.
  • a pull on the rod I6 ist closes the circuit through the rheostat and applies an increasing weak pressure to the stacks I2 of carbon disks which gradually lowers their electrical resistance.
  • the pull-rod i6 has screwed onto its. free end the adjusting nut i6 which is engaged by the strap i9 pivotally connected at 2li to the lever v2i iulcrumed at 22 on the ears 23 of the plate 24 screwed to the base B.
  • the lever 2i has an operating arm '55 which carries a cross-bar 26 to the ends of which are connected the tensioned recov-1 ery springs 2l anchored to the notched horns 2t rising from the plate 2t at opposite sides of the pull-rod i6, nut i8 and pull-strap or stirrupi9.
  • the springs 2l are adjustable along the horns 28 and may each be shifted to any one of the plurality of notches 28' in its respective horn 28.
  • the cover A is formed with a rectangular ver.- tical guideway 29, Fig. rI. in which is fitted the pedal slide 30 slotted or bifurcated at 3
  • One of the side walls 2 of the cover A is formed with a conductor-cord receiving slot 36, Fig. 7, having a toothed or roughened top wall 31 against which the conductor cord 38 is gripped by the toothed upper face 39o! the tongue 40 on the base B.
  • the cover A is also provided with the foot rest 4l to better enable the operator to con- 'in a substantially vertical position, as showny in Fig. 14, on the frame of a sewing machine treadlestand and operated by a straight pull connection to the treadle member of the stand.
  • the -casing comprises a base D and removable hollow cover E housing a carbon compression resistor unit Il identical with that shown in the preceding figures.
  • the pull-rod I6 of this rheostat, adjusting nut I6 and pull-strap I9 are identical with the like parts of the preceding figures, as are the lever 2
  • the diiierence in the ltwo constructions resides mainly in the substitution for the push-pedal 30 oi' a pull-block 42 molded from phenolic condensation material with the slotted metal insert pullplate 43.
  • the pull-block 42 is connected to the long screw 44 which replaces the short screw 22 of Figs. 1 and 2.
  • the block 42 is slotted in its under side at 46. Pig. 17, to straddle the lever 2 i.. It is also formed with notches 46 to clear the cross-bar 26.
  • the pull-block 42 is guided by the guicleway 41 in the casing. A stop lug 43 on the block 42 arrests the down movement of the latter.
  • a carbon compression rheostat including a carbon compression resistor, an operating pull-rod, and spring means controlled by said rod to apply operative pressures to said resistor, a casing for said resistor, a lever fulcrumed-in said casing and connected to said pull-rod, said ⁇ lever having an operating arm, a pedal arranged to depress said arm, and a tension-spring having its longitudinal axis s paced above and extending transversely of the pivotal axis of said lever, said spring being connected at one end to said operating arm, a spring-anchorage arm xed within said casing, the other end of said spring being connected to and shiftable 1ongitudinally of said spring-anchorage arm to vary the spacing betweenthe longitudinal axis of said spring and the pivotal axis of said lever.
  • a manually operated member of molded phenolic condensation material slidably ttingsaid guideway and having a blfurcated end within said casing, a lever fulcrumed on said bottom member within said casing and straddled -by said manually loperated member, a recovery spring connected to said lever, and a carbon compression resistor unit mounted within said casing and having an operating pull-rod connected to said lever.
  • a rheostat comprising a hollow casing including separable cover and base members, a carbon compression resistance unit mounted within said casing and having an operating pull-rod, an adjusting nut screw-threaded onto said pull-rod, a strap engaging said adjusting nut, a lever fulcrumed on said base and4 connected to said strap,
  • chorage xed to said base and including spaced horns extending away from said base at opposite sides -of said pull-rod, nut and strap, a pair oi.' tension-springs each connecting an end o! said cross-bar with a respective one of said spaced horns, and manually controlled means to operate said connected lever, strap, nut and pull-rod.
  • a carbon compression rheostat including a carbon compression resistor, an operating pull-rod, and a spring system controlled by said rod to apply operative pressures to said resistor, a casing for said resistor, a lever iulcrumed in said casing and connected to said pull-rod, said lever having an operating arm, a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Adjustable Resistors (AREA)
  • Sewing Machines And Sewing (AREA)
US35913A 1935-08-13 1935-08-13 Rheostat Expired - Lifetime US2117257A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US35913A US2117257A (en) 1935-08-13 1935-08-13 Rheostat
GB10217/36A GB457254A (en) 1935-08-13 1936-04-07 Rheostat
FR805503D FR805503A (fr) 1935-08-13 1936-04-27 Rhéostat
DES122661D DE674201C (de) 1935-08-13 1936-05-13 Kohledruckregelwiderstand mit einer Zugstange, die von einem Winkelhebel bewegt wird
AT149296D AT149296B (de) 1935-08-13 1936-05-14 Widerstandsregler.
CH188136D CH188136A (de) 1935-08-13 1936-05-15 Rheostat.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US35913A US2117257A (en) 1935-08-13 1935-08-13 Rheostat

Publications (1)

Publication Number Publication Date
US2117257A true US2117257A (en) 1938-05-10

Family

ID=21885516

Family Applications (1)

Application Number Title Priority Date Filing Date
US35913A Expired - Lifetime US2117257A (en) 1935-08-13 1935-08-13 Rheostat

Country Status (6)

Country Link
US (1) US2117257A (de)
AT (1) AT149296B (de)
CH (1) CH188136A (de)
DE (1) DE674201C (de)
FR (1) FR805503A (de)
GB (1) GB457254A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2502372A (en) * 1947-11-05 1950-03-28 Singer Mfg Co Electric sewing-machine cabinet with built-in motor controller
US2533519A (en) * 1948-10-15 1950-12-12 Sharenow Alexander Carbon resistor rheostat
US2596673A (en) * 1949-07-23 1952-05-13 Garey Richard Pressure rheostat
US2843710A (en) * 1954-03-23 1958-07-15 Singer Mfg Co Carbon-pile controllers with built-in snap action switch
US2988720A (en) * 1957-08-12 1961-06-13 Peter H Voorias Electrical control rheostat

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561556A (en) * 1948-05-08 1951-07-24 Irving J Moritt Rheostat
US20110098083A1 (en) 2008-05-19 2011-04-28 Peter Lablans Large, Ultra-Thin And Ultra-Light Connectable Display For A Computing Device
JP6959798B2 (ja) * 2017-08-31 2021-11-05 Juki株式会社 ミシンの足踏み式コントローラー

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2502372A (en) * 1947-11-05 1950-03-28 Singer Mfg Co Electric sewing-machine cabinet with built-in motor controller
US2533519A (en) * 1948-10-15 1950-12-12 Sharenow Alexander Carbon resistor rheostat
US2596673A (en) * 1949-07-23 1952-05-13 Garey Richard Pressure rheostat
US2843710A (en) * 1954-03-23 1958-07-15 Singer Mfg Co Carbon-pile controllers with built-in snap action switch
US2988720A (en) * 1957-08-12 1961-06-13 Peter H Voorias Electrical control rheostat

Also Published As

Publication number Publication date
DE674201C (de) 1939-04-06
AT149296B (de) 1937-04-10
GB457254A (en) 1936-11-24
FR805503A (fr) 1936-11-21
CH188136A (de) 1936-12-15

Similar Documents

Publication Publication Date Title
US2117257A (en) Rheostat
US2561556A (en) Rheostat
US2134323A (en) Rheostat
US2535021A (en) Foot pedal arrangement for controlling phonograph transcriber switches
US2352815A (en) Electric switch
US2594216A (en) Electric switch of the snap action type
US1949826A (en) Sewing machine motor-controller
US2281764A (en) Pressure-responsive switch
US2384772A (en) Sewing machine motor controller
US1772361A (en) Motor controller
US2536012A (en) Carbon pile rheostat
US2607139A (en) Electric iron assembly means
US2673358A (en) Electric apparatus for securing basic wax sheets to the wires of honeycomb frames for beehives
US2210037A (en) Electric switch
US1180047A (en) Electric riveting apparatus.
US2200557A (en) Electric heating device
US2582343A (en) Variable resistance
US2850605A (en) Variable resistance controller
US2193127A (en) Switch assembly
US2569807A (en) Electric marking machine
US2502372A (en) Electric sewing-machine cabinet with built-in motor controller
US2022491A (en) Foot-operated motor controller
US2359075A (en) Circuit controller
US2158850A (en) Temperature control device
US1728004A (en) Rheostat