US3780245A - Rotary switch with enlarged shaft journaled in and removable through switch cover - Google Patents

Rotary switch with enlarged shaft journaled in and removable through switch cover Download PDF

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US3780245A
US3780245A US00270141A US3780245DA US3780245A US 3780245 A US3780245 A US 3780245A US 00270141 A US00270141 A US 00270141A US 3780245D A US3780245D A US 3780245DA US 3780245 A US3780245 A US 3780245A
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opening
diameter
cover plate
carrier member
rounded end
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US00270141A
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E Beddow
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ELEC IRON Inc
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ELEC IRON Inc
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/015—Boards, panels, desks; Parts thereof or accessories therefor
    • H02B1/04—Mounting thereon of switches or of other devices in general, the switch or device having, or being without, casing
    • H02B1/044—Mounting through openings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch

Definitions

  • ABSTRACT An electrical switch characterized by a series of rotatable contacts and fixed contacts in a switch body capable of making and breaking several circuits including an integrally formed one-piece rotary contact carrier, handle and enlarged connecting shaft with the width of the handle portion being no wider than the diameter of the connecting shaft so that the handle can be passed through the opening in the switch cover plate.
  • the present invention combines three of the separate elements of the prior art switch into a single molded or otherwise formed piece.
  • the contact carrier, connecting shaft and handle are formed together with the connecting shaft having an enlarged diameter.
  • the opening in the cover plate has an equally large journal opening for receipt of the connecting shaft. Due to the enlarged opening in the cover plate, a handle of substantial dimension can be passed through the opening which was not possible with any of the prior art switches. This allows the handle shaft and contact carrier now to be a unitary structure. Due to the increased diameter of the journal and bearing, the rotating structure of the switch no longer needs a second journal and bearing to adequately maintain its position, as required in the above mentioned prior art switches,
  • Another object of the present invention is to provide an integrally formed rotating switch member which has a single journal bearing mounting.
  • a further object of the present invention is to provide an integrally forming rotating carrier member which is molded in a single piece and is very simple in design and economic in cost.
  • Another object of the present invention is to provide a rotating switch with a fixed handle.
  • FIG. 1 is an exploded perspective view of the various parts which comprise the rotary switch construction embodied in the present invention
  • FIG. 2 is a sectional view taken along lines 2 2 of FIG. 3;
  • FIG. 3 is a front view of the assembled switch
  • FIG. 4 is a front view of the switch with the cover plate removed.
  • the main parts of the switch include the rotating structure generally identified by reference numeral 10, the switch body identified by reference numeral 12 and the switch cover plate 14.
  • the switch body 12 which is molded of a phenolic or another suitable insulating material, has a large recess 15 with a plurality of fixed contacts 16 located around the periphery of the recess 15.
  • the Z-shaped contacts 16 are conventional and well known in the art, having the dual function of quick-connect terminals for conductors entering slots 18 as described in detail in the above mentioned prior art patent.
  • the rotating structure 10 of the switch includes a set of rotary contacts 20 formed from a thin sheet of brass which is also old in the art and therefore not described in detail.
  • the rotating carrier member 22 molded of a phenolic or other suitable material, includes a rounded end portion 24 having a plurality of angularly spaced notches 26 spaced around the periphery thereof to receive the gripping fingers 28 of the flexible rotary contacts 20. Connecting the handle portion 32 to the rounded end portion 24 is an enlarged shaft portion 34.
  • the opening 35 in the cover plate 14 functions as a journal for the shaft portion 34.
  • Sandwiched between the cover plate and the switch body is an insulating cover 37 having an opening 38 therein which is slightly larger in diameter than the opening 35 in the cover plate. Extending into the opening 38 is a tap 39 for limiting the angular rotation of the carrier member 22.
  • the opening 38 acts as a journal for the rounded end portion 24 of the carrier member 22.
  • a groove 40 Cut into the periphery of the rounded end portion 24 is a groove 40 which extends approximately around the end portion 24, as indicated by the line A A in FIG. 4. A portion of the groove 40 is also seen in FIG. 1. Extending into groove 40 is tab 39 to limit the angular movement of the rotating structure 10 of the switch. Positioned on opposite edges of the insulating cover 37 are a pair of notches 44 which receive the bendable tabs 46 on the cover plate 14 and hold the insulating cover from any rotation once the switch is assembled.
  • the rotating structure 10 is merely introduced into the cover plate 14 through openings 35 and 38. While the handle portion 32 illustrated in the drawing is shown with a width slightly smaller than openings 38, it could be modified in an offset manner just as long as it has a dimension less than the diameter of opening 38 so that the handle could be passed through the cover plate 14, as for example an L-shaped handle.
  • a rotary switch comprising:
  • a cover plate with an enlarged opening therein covering the recess
  • a single piece integrally formed rotating carrier member including a rounded end portion having means around the circumference thereof for receipt of the rotary contacts, an enlarged shaft portion extending from the rounded end portion, joumaled in the cover plate opening, and a handle portion axially extending from the shaft portion, the handle portion having a dimension substantially equal to or less than the diameter of the enlarged shaft portion whereby when assembled or disassembled the handle portion can be passed through the cover plate opening.
  • a rotary switch as set forth in claim 1 including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the rounded end portion of the carrier and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular rotary movement of the carrier member, the diameter of the shaft portion being less than the diameter of the rounded end portion.
  • a rotary switch as set forth in claim 1 including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the carrier member, and a stationary tab means extending into said circumferential groove limiting the angular rotary movement of the carrier member, the handle portion dimension being the width which is substantially equal to the diameter of the enlarged shaft portion.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

An electrical switch characterized by a series of rotatable contacts and fixed contacts in a switch body capable of making and breaking several circuits including an integrally formed onepiece rotary contact carrier, handle and enlarged connecting shaft with the width of the handle portion being no wider than the diameter of the connecting shaft so that the handle can be passed through the opening in the switch cover plate.

Description

United States Patent 1191 Beddow [4 1 Dec. 18,1973
[ 1 ROTARY SWITCH WITH ENLARGED SHAFT JOURNALED IN AND REMOVABLE THROUGH SWITCH COVER [75] Inventor: Elmer J. Beddow, Wichita, Kans.
[73] Assignee: Elec-lron, Inc., Wichita, Kans.
[22] Filed: July 10, 1972 [21] Appl. No.: 270,141
[52] US. Cl. 200/155 R, 200/6 R, 200/11 R, 200/172 R [51] Int. Cl. H01h 19/14 [58] Field of Search 200/11 R, 6 R, 6 C, 200/11 G, 155 A, 155 R, 11 A, 172 R [56] References Cited UNITED STATES PATENTS 4/1961 Nabstedt 200/11 A 3,363,070 1/1968 Kussy 200/155 R X 2,921,147 l/1960 Hutt 200/6 R 3,309,471 3/1967 Korrell 200/11 G Primary Examiner-RobertK. Schaefer Assistant Examiner-Robert A. Vanderhye Attorney-Mi1ler & Brown [5 7] ABSTRACT An electrical switch characterized by a series of rotatable contacts and fixed contacts in a switch body capable of making and breaking several circuits including an integrally formed one-piece rotary contact carrier, handle and enlarged connecting shaft with the width of the handle portion being no wider than the diameter of the connecting shaft so that the handle can be passed through the opening in the switch cover plate.
10 Claims, 4 Drawing Figures ROTARY SWITCH WITH ENLARGED SHAFT JOURNALED IN AND REMOVABLE THROUGH SWITCH COVER BACKGROUND OF THE INVENTION The prior art rotary switchesof the present type are typical of the design shown in U.S. Pat. No. 2,813,158. The rotating portions of this switch include the separate elements of rotary contacts, a rotary contact carrier and cam, a connecting shaft and a removable handle. It has been necessary to have a removable handle since the connecting shaft must pass through an opening in the cover plate which acts as a journal for the rotating shaft.
SUMMARY OF THE INVENTION The present invention combines three of the separate elements of the prior art switch into a single molded or otherwise formed piece. The contact carrier, connecting shaft and handle are formed together with the connecting shaft having an enlarged diameter. The opening in the cover plate has an equally large journal opening for receipt of the connecting shaft. Due to the enlarged opening in the cover plate, a handle of substantial dimension can be passed through the opening which was not possible with any of the prior art switches. This allows the handle shaft and contact carrier now to be a unitary structure. Due to the increased diameter of the journal and bearing, the rotating structure of the switch no longer needs a second journal and bearing to adequately maintain its position, as required in the above mentioned prior art switches,
It is therefore the principal object of the present invention to provide an integrally formed rotating structure in a rotary switch.
Another object of the present invention is to provide an integrally formed rotating switch member which has a single journal bearing mounting.
A further object of the present invention is to provide an integrally forming rotating carrier member which is molded in a single piece and is very simple in design and economic in cost.
Another object of the present invention is to provide a rotating switch with a fixed handle.
My invention will be better understood from the following description taken in connection with the accompanying drawings, and its scope will be pointed out in the appended claims.
FIG. 1 is an exploded perspective view of the various parts which comprise the rotary switch construction embodied in the present invention;
FIG. 2 is a sectional view taken along lines 2 2 of FIG. 3;
FIG. 3 is a front view of the assembled switch; and
FIG. 4 is a front view of the switch with the cover plate removed.
Referring in detail to the drawings and in particular to the exploded view of FIG. 1, the main parts of the switch include the rotating structure generally identified by reference numeral 10, the switch body identified by reference numeral 12 and the switch cover plate 14. The switch body 12, which is molded of a phenolic or another suitable insulating material, has a large recess 15 with a plurality of fixed contacts 16 located around the periphery of the recess 15. The Z-shaped contacts 16 are conventional and well known in the art, having the dual function of quick-connect terminals for conductors entering slots 18 as described in detail in the above mentioned prior art patent. The rotating structure 10 of the switch includes a set of rotary contacts 20 formed from a thin sheet of brass which is also old in the art and therefore not described in detail. The rotating carrier member 22, molded of a phenolic or other suitable material, includes a rounded end portion 24 having a plurality of angularly spaced notches 26 spaced around the periphery thereof to receive the gripping fingers 28 of the flexible rotary contacts 20. Connecting the handle portion 32 to the rounded end portion 24 is an enlarged shaft portion 34. The opening 35 in the cover plate 14 functions as a journal for the shaft portion 34. Sandwiched between the cover plate and the switch body is an insulating cover 37 having an opening 38 therein which is slightly larger in diameter than the opening 35 in the cover plate. Extending into the opening 38 is a tap 39 for limiting the angular rotation of the carrier member 22. The opening 38 acts as a journal for the rounded end portion 24 of the carrier member 22. Cut into the periphery of the rounded end portion 24 is a groove 40 which extends approximately around the end portion 24, as indicated by the line A A in FIG. 4. A portion of the groove 40 is also seen in FIG. 1. Extending into groove 40 is tab 39 to limit the angular movement of the rotating structure 10 of the switch. Positioned on opposite edges of the insulating cover 37 are a pair of notches 44 which receive the bendable tabs 46 on the cover plate 14 and hold the insulating cover from any rotation once the switch is assembled.
In assembling the switch from the exploded position of FIG. 1, the rotating structure 10 is merely introduced into the cover plate 14 through openings 35 and 38. While the handle portion 32 illustrated in the drawing is shown with a width slightly smaller than openings 38, it could be modified in an offset manner just as long as it has a dimension less than the diameter of opening 38 so that the handle could be passed through the cover plate 14, as for example an L-shaped handle.
Modifications of this invention will occur to those skilled in this art, such as the one just mentioned, and it is to be understoodtherefore, that this invention is not limited to the particular embodiments disclosed, but that it is intended to cover all modifications which are within the true spirit and scope of this invention. The detailed structure and function of the electrical contacts 16 and 20 was not mentioned in detail since they are well known in the art.
What is claimed is: v
l. A rotary switch comprising:
a recessed body with resilient fixed contacts located in the periphery of the recess;
a cover plate with an enlarged opening therein covering the recess;
means for holding the cover plate in place on the body;
a set of rotary contacts located in the recess;
a single piece integrally formed rotating carrier member including a rounded end portion having means around the circumference thereof for receipt of the rotary contacts, an enlarged shaft portion extending from the rounded end portion, joumaled in the cover plate opening, and a handle portion axially extending from the shaft portion, the handle portion having a dimension substantially equal to or less than the diameter of the enlarged shaft portion whereby when assembled or disassembled the handle portion can be passed through the cover plate opening.
2. A rotary switch as set forth in claim 1, wherein the diameter of the shaft portion is less than the diameter of the rounded end portion.
3. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the carrier member, and a stationary tab means extending into said circumferential groove limiting the angular rotary movement of the carrier member.
4. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the rounded end portion of the carrier and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular rotary movement of the carrier member.
5. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the rounded end portion of the carrier and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular rotary movement of the carrier member, the diameter of the shaft portion being less than the diameter of the rounded end portion.
6. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein to journally receive the rounded end portion of the carrier, a circumferential groove extending partially around a portion of the rounded end portion of the carrier, and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular movement of the carrier member, the diameter of the shaft portion being less than the diameter of the rounded end portion.
7. A rotary switch as set forth in claim 1, wherein the handle portion dimension is the width which is substantially equal to the diameter of the enlarged shaft position.
8. A rotary switch as set forth in claim 1, wherein the handle portion extends along a diameter line of the enlarged shaft a diameter distance whereby the handle portion freely slides through the opening in the cover plate.
9. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein to journally receive the rounded end portion of the carrier, a circumferential groove extending partially around a portion of the rounded end portion of the carrier, and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular movement of the carrier member, the diameter of the shaft portion being less than the diameter of the rounded end portion, and the handle portion dimension being the width which is substantially equal to the diameter of the enlarged shaft portion. I
10. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the carrier member, and a stationary tab means extending into said circumferential groove limiting the angular rotary movement of the carrier member, the handle portion dimension being the width which is substantially equal to the diameter of the enlarged shaft portion.

Claims (10)

1. A rotary switch comprising: a recessed body with resilient fixed contacts located in the periphery of the recess; a cover plate with an enlarged opening therein covering the recess; means for holding the cover plate in place on the body; a set of rotary contacts located in the recess; a single piece integrally formed rotating carrier member including a rounded end portion having means around the circumference thereof for receipt of the rotary contacts, an enlarged shaft portion extending from the rounded end portion, journaled in the cover plate opening, and a handle portion axially extending from the shaft portion, the handle portion having a dimension substantially equal to or less than the diameter of the enlarged shaft portion whereby when assembled or disassembled the handle portion can be passed through the cover plate opening.
2. A rotary switch as set forth in claim 1, wherein the diameter of the shaft portion is less than the diameter of the rounded end portion.
3. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the Periphery of the carrier member, and a stationary tab means extending into said circumferential groove limiting the angular rotary movement of the carrier member.
4. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the rounded end portion of the carrier and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular rotary movement of the carrier member.
5. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the rounded end portion of the carrier and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular rotary movement of the carrier member, the diameter of the shaft portion being less than the diameter of the rounded end portion.
6. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein to journally receive the rounded end portion of the carrier, a circumferential groove extending partially around a portion of the rounded end portion of the carrier, and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular movement of the carrier member, the diameter of the shaft portion being less than the diameter of the rounded end portion.
7. A rotary switch as set forth in claim 1, wherein the handle portion dimension is the width which is substantially equal to the diameter of the enlarged shaft position.
8. A rotary switch as set forth in claim 1, wherein the handle portion extends along a diameter line of the enlarged shaft a diameter distance whereby the handle portion freely slides through the opening in the cover plate.
9. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein to journally receive the rounded end portion of the carrier, a circumferential groove extending partially around a portion of the rounded end portion of the carrier, and a tab means extending inwardly from the opening in the insulating plate into said groove limiting the angular movement of the carrier member, the diameter of the shaft portion being less than the diameter of the rounded end portion, and the handle portion dimension being the width which is substantially equal to the diameter of the enlarged shaft portion.
10. A rotary switch as set forth in claim 1, including an insulating plate positioned under the cover plate with an opening therein for receipt of the carrier member, a circumferential groove extending partially around the periphery of the carrier member, and a stationary tab means extending into said circumferential groove limiting the angular rotary movement of the carrier member, the handle portion dimension being the width which is substantially equal to the diameter of the enlarged shaft portion.
US00270141A 1972-07-10 1972-07-10 Rotary switch with enlarged shaft journaled in and removable through switch cover Expired - Lifetime US3780245A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983447A (en) * 1975-05-23 1976-09-28 Arnold Mark Switch and dual lamp and switch combination
US4167660A (en) * 1978-01-10 1979-09-11 Shick Incorporated Rotatable control switch for appliance
DE2928558A1 (en) 1979-07-14 1981-01-29 Metrawatt Gmbh Portable multimeter with concentric switch and indicator rotor - has printed circuit board and snap-fitting housing parts
US4348569A (en) * 1980-08-15 1982-09-07 Oak Industries Inc. Rotary switch
US4579018A (en) * 1982-11-18 1986-04-01 Alps Electric Co., Ltd. Band selector switch
DE2954393C2 (en) * 1979-07-14 1987-03-05 Metrawatt GmbH, 8500 Nürnberg Step rotary switch for analog multimeters
US5483029A (en) * 1992-12-18 1996-01-09 Lundquist; Lynn C. Method of operation of motor multiple switches and circuitry
US5581137A (en) * 1992-12-18 1996-12-03 Lundquist; Lynn C. Motor multiple switches and circuitry
US5728982A (en) * 1996-01-29 1998-03-17 Tower Manufacturing Corporation Miniature rotary electric switch
US6294746B1 (en) * 2000-05-17 2001-09-25 Vincent Yee Rotary switch
US6605787B1 (en) * 2002-09-10 2003-08-12 Defond Manufacturing Limited Electrical switch
US20100006411A1 (en) * 2008-07-09 2010-01-14 Lucian Iordache Switch attachment assembly
US8864476B2 (en) 2011-08-31 2014-10-21 Flow Control Llc. Portable battery operated bilge pump
CN105895414A (en) * 2016-06-28 2016-08-24 刘凡 Multi-level cascade electric switch with load breaking capability

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921147A (en) * 1957-09-03 1960-01-12 Gen Electric Enclosed double rotary switch
US2980770A (en) * 1958-12-18 1961-04-18 Daven Company Miniature switch
US3309471A (en) * 1966-05-23 1967-03-14 Appliance Mfg Co Inc Rotary switch contact structure with improved washer fastening means
US3363070A (en) * 1965-12-01 1968-01-09 Ite Circuit Breaker Ltd Two and three-position selector switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921147A (en) * 1957-09-03 1960-01-12 Gen Electric Enclosed double rotary switch
US2980770A (en) * 1958-12-18 1961-04-18 Daven Company Miniature switch
US3363070A (en) * 1965-12-01 1968-01-09 Ite Circuit Breaker Ltd Two and three-position selector switch
US3309471A (en) * 1966-05-23 1967-03-14 Appliance Mfg Co Inc Rotary switch contact structure with improved washer fastening means

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983447A (en) * 1975-05-23 1976-09-28 Arnold Mark Switch and dual lamp and switch combination
US4167660A (en) * 1978-01-10 1979-09-11 Shick Incorporated Rotatable control switch for appliance
DE2928558A1 (en) 1979-07-14 1981-01-29 Metrawatt Gmbh Portable multimeter with concentric switch and indicator rotor - has printed circuit board and snap-fitting housing parts
DE2954393C2 (en) * 1979-07-14 1987-03-05 Metrawatt GmbH, 8500 Nürnberg Step rotary switch for analog multimeters
US4348569A (en) * 1980-08-15 1982-09-07 Oak Industries Inc. Rotary switch
US4579018A (en) * 1982-11-18 1986-04-01 Alps Electric Co., Ltd. Band selector switch
US5483029A (en) * 1992-12-18 1996-01-09 Lundquist; Lynn C. Method of operation of motor multiple switches and circuitry
US5581137A (en) * 1992-12-18 1996-12-03 Lundquist; Lynn C. Motor multiple switches and circuitry
US5728982A (en) * 1996-01-29 1998-03-17 Tower Manufacturing Corporation Miniature rotary electric switch
US6294746B1 (en) * 2000-05-17 2001-09-25 Vincent Yee Rotary switch
US6605787B1 (en) * 2002-09-10 2003-08-12 Defond Manufacturing Limited Electrical switch
US20100006411A1 (en) * 2008-07-09 2010-01-14 Lucian Iordache Switch attachment assembly
US8110766B2 (en) 2008-07-09 2012-02-07 Omron Dualtec Automotive Electronics Inc. Switch attachment assembly
US8864476B2 (en) 2011-08-31 2014-10-21 Flow Control Llc. Portable battery operated bilge pump
US8894389B2 (en) 2011-08-31 2014-11-25 Flow Control Llc. Rechargeable battery powered utility pump with series centrifugal pump configuration
CN105895414A (en) * 2016-06-28 2016-08-24 刘凡 Multi-level cascade electric switch with load breaking capability

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