US2518584A - Centrifugal switch - Google Patents

Centrifugal switch Download PDF

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Publication number
US2518584A
US2518584A US573486A US57348645A US2518584A US 2518584 A US2518584 A US 2518584A US 573486 A US573486 A US 573486A US 57348645 A US57348645 A US 57348645A US 2518584 A US2518584 A US 2518584A
Authority
US
United States
Prior art keywords
rubbing
plate
collar
spring
shaft
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
US573486A
Other languages
English (en)
Inventor
Calvin J Werner
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.)
Motors Liquidation Co
Original Assignee
General Motors Corp
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
Priority to BE461108D priority Critical patent/BE461108A/xx
Application filed by General Motors Corp filed Critical General Motors Corp
Priority to US573486A priority patent/US2518584A/en
Priority to GB27459/45A priority patent/GB603371A/en
Priority to FR917495D priority patent/FR917495A/fr
Application granted granted Critical
Publication of US2518584A publication Critical patent/US2518584A/en
Priority to DEG1750U priority patent/DE1633420U/de
Priority to DEG3524A priority patent/DE822130C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/06—Switches operated by change of speed
    • H01H35/10—Centrifugal switches

Definitions

  • This invention relates to improvements in control' devices and particularly such devices which are operated by a centrifugal actuator.
  • a further object of the present invention is toprovide the surface of one metallic member of a mechanism with a glazed, vitreous surface materialwhich provides a smooth and substantially non-abrasive surface over the comparatively rougher surface of the metallic member thereby substantially reducing wear'of' a fibrous 'par-tzof the mechanism which constantly engages said glazed surface with a revolving movement.
  • Fig. 3. is a view taken along: the line 3-3. of Fig. 1.
  • Fig. 4' is a fragmentary, greatly enlarged sec-- t'iozrof two engaging partsof the mechanism.
  • Fig.5 is a view similar. to. Fig; 4-, the. one part of; the: mechanism being shown. provided with the present invention.
  • FIG. 1 Av stator comprising a frame 2! and windings 22. and 23 is carried in frame 29.
  • An end cover 24" is secured to the frame 1 20, said end, member rotatably supporting; in a manner not shown, the armature shaft. 25'. which sup-ports the rotor 26 of:the motor.
  • the shaft 25 has: a transverse opening 2.! throughitsaxiscin-whiclua rodz'28 ofithe centrifugalidevi'ce is slidalolysupported.
  • a collar 29 is secured to the. rod 28 and is normally held. in engagement with the shaft 25 by a coil spring 33 which surrounds the rod 28 on the side of shaft 2 5 opposite the collar 29.
  • Spring 33 is interposed between the shaft 25 and an adjustable nut-34 threaded on one end of the rod 28.
  • a fibrous rubbing collar 32 having a metallic washer of smaller diameter than said collar attached on each side thereof, is mounted on the rod 28 adjacent the collar 29 and several weight members 3 in the form of thick washers are secured on rod 287' and clamped upon the rubbing collar 32 by the head 31! formed at the end of rod 28 oppositethe nut 34.
  • Fig. 1 shows the centrifugal mechanisminthe normal positionas the shaft rotates below a predetermined speed
  • Fig. 2 shows themechanism in the shifted position responsive tothe rotation of shaft 25' at or in excess of the said predetermined speed.
  • The' switch actuated by the movementof the rod assembly just described comprises an insulating: plate 36 secured to' the end cover 2! of: the electric motor by studs 31" and 38.
  • Stud 315 has a flanged insulator 31a secured thereto inside'the endcover 24- and likewise stud has aflanged ins lators'ga attached thereto.
  • Two stationary contacts s'and lfi are carried'by the plate136.
  • the movablemember of the switch comprises a skillet-shaped lever plate 43 having openings for receiving the: insulators 310; and 3'8a respectively.
  • a clearance between each insulator 31a and 3iia.and its respective opening inthe plate 43 is provided so as to permittiltine ofthe plate.
  • the end of the skillet-shaped plate 43 adjacent the rubbing collar 32 is frusto-conical in shape presenting a sloping surface :35 and a flat surface 46.
  • the surface 45 has an opening 41 greater in diameter than shaft 25 which extends therethrough, thereby permitting free tilting movement of the plate.
  • spring 33 When the electric motor is inoperative, or until it reaches a predetermined operating speed, spring 33 will urge the rod 23 to hold its collar 29 upon shaft 25. Under this condition, as shown in Fig. 1, the rubbing block 82 engages the flat surface 46 of the skillet-shaped plate 43, thus urging said plate counterclockwise about the insulating plate and stationary contacts 42 and 40 respectively, acting as pivot. The spring 48 is compressed under these conditions.
  • the dish shaped end or more specifically the flat or the sloping surfaces of said plate t3 is held in constant engagement with the rubbing block or collar 32. While the motor operates said collar is revolved by the rotating shaft 25, thus the rubbing collar in operation engages the plate :33 in a circular rubbing path.
  • the skillet-shaped plate is stamped and formed from sheet metal, the surface of which though apparently smooth, presents a microscopically rough and abrasive surface which tests have shown prematurely wears out the fibrous rubbing collar 52 due to its constant rubbing contact with such surface.
  • plates 23 were electroplated as shown in Fig. 4, which is a fragmentary section, on an enlarged scale, of a portion of the plate 33. This figure shows the plated surface covering 5i] assuming practically the same contours of the various irregularities in the surface of the plate and this also presents an abrasive surface which will also cause excessive wear upon the engaging fibrous rubbing collar.
  • Fig. 5 illustrates a fragment of plate 43 at an enlarged scale, treated according to the present invention.
  • the surface of the metal making up the plate has the same irregularities as that shown in Fig. 4.
  • Plating of the surface as shown in Fig. 4 does not eliminate these regularities for the plate-deposit is comparatively thin and follows the contours of the irregularities thus still presenting high and low spots which when engaged by the fibrous rubbing collar causes excessive wear thereof.
  • the metal plate 43 is covered with a glazed, vitreous surface such as porcelain El or the like
  • the flow as the covering is applied, fills all of the irregularities and presents a smooth glass-like outer surface which may be slightly wavy but still avoids the presence of the abrasive irregularities as is the case in the electro-plating of the plate 43.
  • flowed onto the plate 43 before subjected to the baking process, fills the recesses 52 in the metal surface, the high spots 53 having a very thin covering of the porcelain.
  • the porcelain forms a smooth, non-abrasive and glass-like surface which does not cause excessive wear on the constantly engaging rubbing collar 32.
  • a control device comprising in combination, a stationary element; a movable member shiftable relatively to said stationary element; an actuator member, constantly engaging the movable member and operative to shift said movable member; means urging the movable member into uninterrupted engagement with the actuator and at a substantially unvarying pressure; a fibrous rubbing block attached to one of said members and constantly engaging the other of said members; a hard and smooth vitreous surface covering on the member constantly engaged by the rubbing block, said surface covering being free from abrasive action on said rubbing block; and means for operating the actuator member.
  • a centrifugal control device comprising in combination, a control member movable from one position into another to effect control; a spring exerting a substantially unvarying pressure upon the control member constantly urging said control member toward one of its control positions; a, rotatable member; an actuator on the rotatable member, constantly engaging the control member and normally urging said control member toward the other of its control positions against the effect of the spring; and a hard and smooth vitreous covering on the control member, said covering providing a wear resisting surface, free from abrasive action upon the actuator which constantly engages it.
  • a centrifugal control device comprising in combination, a control member tiltable into two separate control positions, said member having a frusto-conically shaped portion; a spring exerting a. substantially unvarying pressure upon the control member constantly urging said member toward one of its control positions; 'a rotatable member; a centrifugal actuator carried'by the rotatable member, said actuator having a fibrous rubbing element in constant engagement with the sloping surface of the frustO-conically shaped portion of said control member and operative to urge said member toward the other of its control positions against the effect of the spring; and a Wear resisting coating of hard, smooth vitreous material on the frusto-conically shaped portion of the control member, said surface being free from abrasive action upon the rubbing, element and having a high wear resisting quality which permits an increased spring pressure to be applied to said control member for effecting more eilicient control.
  • a centrifugal control device comprising in combination, a metallic member tiltable from one position into another to efiect control, said member having a glazed; vitreous coating providing a wear resisting, smooth surface substantially free from abrasive action upon cooperating parts; a centrifugal actuator having a rubbing block in constant engagement with the glazed surface of 6 said member and operative to effect tilting thereof in response to variations in the rotating speed of the actuator; a spring engaging said member and urging it with a substantially unvarying pressure into constant engagement with said rubbing block; and rotatable means supporting said actuator.

Landscapes

  • Adornments (AREA)
  • Ink Jet (AREA)
  • Switches With Compound Operations (AREA)
  • Window Of Vehicle (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Brushes (AREA)
US573486A 1945-01-19 1945-01-19 Centrifugal switch Expired - Lifetime US2518584A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE461108D BE461108A (en)van) 1945-01-19
US573486A US2518584A (en) 1945-01-19 1945-01-19 Centrifugal switch
GB27459/45A GB603371A (en) 1945-01-19 1945-10-19 Improved centrifugally operated electric switch
FR917495D FR917495A (fr) 1945-01-19 1945-11-16 Interrupteur à force centrifuge
DEG1750U DE1633420U (de) 1945-01-19 1950-09-11 Elektrischer fliehkraftschalter.
DEG3524A DE822130C (de) 1945-01-19 1950-09-12 Elektrischer Fliehkraftschalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US573486A US2518584A (en) 1945-01-19 1945-01-19 Centrifugal switch

Publications (1)

Publication Number Publication Date
US2518584A true US2518584A (en) 1950-08-15

Family

ID=24292181

Family Applications (1)

Application Number Title Priority Date Filing Date
US573486A Expired - Lifetime US2518584A (en) 1945-01-19 1945-01-19 Centrifugal switch

Country Status (5)

Country Link
US (1) US2518584A (en)van)
BE (1) BE461108A (en)van)
DE (2) DE1633420U (en)van)
FR (1) FR917495A (en)van)
GB (1) GB603371A (en)van)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1866481A (en) * 1930-05-28 1932-07-05 Bendix Brake Co Brake operator
US2054340A (en) * 1932-11-28 1936-09-15 Saunders Philip Keith Diaphragm valve
US2182977A (en) * 1936-10-23 1939-12-12 Gen Motors Corp Centrifugal switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1866481A (en) * 1930-05-28 1932-07-05 Bendix Brake Co Brake operator
US2054340A (en) * 1932-11-28 1936-09-15 Saunders Philip Keith Diaphragm valve
US2182977A (en) * 1936-10-23 1939-12-12 Gen Motors Corp Centrifugal switch

Also Published As

Publication number Publication date
DE1633420U (de) 1952-01-17
DE822130C (de) 1951-11-22
FR917495A (fr) 1947-01-08
BE461108A (en)van)
GB603371A (en) 1948-06-15

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