US20190157019A1 - Electrical switch with a sealing member for use with an electrical device - Google Patents
Electrical switch with a sealing member for use with an electrical device Download PDFInfo
- Publication number
- US20190157019A1 US20190157019A1 US16/181,220 US201816181220A US2019157019A1 US 20190157019 A1 US20190157019 A1 US 20190157019A1 US 201816181220 A US201816181220 A US 201816181220A US 2019157019 A1 US2019157019 A1 US 2019157019A1
- Authority
- US
- United States
- Prior art keywords
- housing
- electrical
- switch unit
- electrical switch
- sealing element
- 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.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/04—Cases; Covers
- H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/0214—Hand-held casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/04—Cases; Covers
- H01H13/08—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2223/00—Casings
- H01H2223/002—Casings sealed
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2231/00—Applications
- H01H2231/012—Household appliance
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2231/00—Applications
- H01H2231/048—Tools; Drilling machines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
- H01H9/063—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner enclosing a reversing switch
Definitions
- the present invention relates to the field of electrical switch units, and in particular relates to electrical switches for use in electrical devices, such as hand-held power tools, personal care devices and home electrical appliances.
- Hand-held electrical devices such as power tools, personal care devices and home electrical appliances may typically include electric switch units which assist in controlling the supply of power to the motor or other electrically operable elements of the device.
- an electrical switch is required to have a requisite level of particulate, dust and water prevention to ingress rating.
- hand-operable power tools are often exposed to harsh environments such as construction or work sites, whereby there is inherently a high level of dust and particulate matter, as well as often moisture and water.
- an operator of such devices may have wet hands or gloves with liquid thereon, such as uncured cement or wet paint, which needs to be prevented from entering the electrical switch.
- a power tool when not used may be laid down in a wet or moist environment or be exposed to the splashing of water.
- O-rings may be located adjacent to openings in the electrical switch housing, for instance, at the opening where're the trigger actuator enters the electrical switch housing to provide a barrier against ingress of dust and water.
- O-rings have a fixed shape and geometry they are suitable for sealing specific regions of an electrical switch housing and are not suitable for sealing regions of the electrical switch housing having non-flat or otherwise irregular shaped surface contours.
- resins may be used to permanently encapsulate or “potting” electrical and mechanical components of an electrical switch.
- the present invention seeks to alleviate at least one of the above-described problems.
- the present invention may involve several broad forms. Embodiments of the present invention may include one or any combination of the different broad forms herein described.
- the present invention provides an electrical switch unit for use in controlling operation of an electrical device, the electrical switch unit including: an electrical switch unit housing for housing at least a pair of electrical switching contacts of the electrical switch unit, said electrical switch unit housing including a first housing member and a second housing member that are configured for attachment together at peripheral regions of the first and second housing members so as to cooperatively form an enclosed space for housing the pair of electrical switching contacts therein; an actuator member operably-connected with at least one of the pair of electrical switching contacts, the actuator being configured for movement relative inwardly and outwardly of an opening in the electrical switch unit housing so as to arrange the pair of electrical switching contacts into at least one of a closed configuration wherein power is able to be supplied from a power source to motor or other electrically-operable element of the electrical device via the pair of electrical switching contacts, and, an opened configuration wherein power is not able to be supplied from the power source to the motor or other electrically-operable element of the electrical device via the pair of electrical switching contacts; and an sealing element including an elastically-re
- the sealing element may be configured to complement a three-dimensional shape contour of the peripheral region of the first or second housing member.
- the present invention may include at least one of a recess and a groove disposed along the peripheral region of at least one of the first and second housing members configured for seating the sealing element therein.
- the sealing element may include an overmold.
- the sealing element may include at least one of a rubber, a foam, and a thermoplastic material.
- the sealing element may include a cross-sectional shape contour including at least one peak and one trough region. More preferably, the cross-sectional shape contour may include a saw-tooth cross-sectional shape contour.
- the present invention provides a method of producing an electrical switch unit for use in controlling operation of an electrical device, the method including steps of: (i) providing an electrical switch unit housing for housing at least a pair of electrical switching contacts of the electrical switch unit, said electrical switch unit housing including a first housing member and a second housing member that are configured for attachment together at peripheral regions of the first and second housing members so as to cooperatively form an enclosed space for housing the pair of electrical switching contacts therein; (ii) providing an actuator member operably-connected with at least one of the pair of electrical switching contacts, the actuator being configured for movement relative inwardly and outwardly of an opening in the electrical switch unit housing so as to arrange the pair of electrical switching contacts into at least one of a closed configuration wherein power is able to be supplied from a power source to motor or other electrically-operable element of the electrical device via the pair of electrical switching contacts, and, an opened configuration wherein power is not able to be supplied from the power source to the motor or other electrically-operable element of the electrical device via the pair of
- the present invention may include a step of forming the sealing element to complement a three-dimensional shape contour of the peripheral region of the first or second housing member.
- the present invention may include at step of forming at least one of a recess and a groove disposed along the peripheral region of at least one of the first and second housing members configured for seating the sealing element therein.
- the sealing element may include an overmold.
- the present invention may include a step of forming the sealing element from at least one of a rubber, a foam, and a thermoplastic material.
- the present invention may include a step of forming the sealing element wherein a cross-sectional shape contour of the sealing element includes at least one peak and one trough region. More preferably, the cross-sectional shape contour may include a saw-tooth cross-sectional shape contour.
- FIG. 1A shows a top perspective view of an electrical switch unit in assembled form in accordance with one embodiment of the present invention
- FIG. 1B shows a perspective cross-sectional view of the electrical switch unit of FIG. 1A in accordance with one embodiment of the present invention
- FIG. 2A shows a cross-sectional side-view of the assembled electrical switch unit shown in FIG. 1A in accordance with one embodiment of the present invention
- FIG. 2B shows a magnified cross-sectional side-view of one aspect of the assembled electrical switch unit shown in FIG. 2A in accordance with one embodiment of the present invention
- FIG. 2C shows a magnified cross-sectional side-view of another aspect of the assembled electrical switch unit shown in FIG. 2A in accordance with one embodiment of the present invention
- FIG. 3A shows a top perspective view of the electrical switch unit of FIG. 1 with the top housing member removed to reveal an elastically-resilient overmold sealing member seated in a recess disposed along the peripheral region of the lower housing member and extending about the peripheral region of the lower housing member;
- FIG. 3B shows a top view of the electrical switch unit of FIG. 3A with the top housing member removed to reveal an elastically-resilient overmold sealing member seated in a recess disposed along the peripheral region of the lower housing member and extending about the peripheral region of the lower housing member;
- FIG. 4A shows a rendered drawing of a top perspective view of an electrical switch unit with the top housing member removed to reveal an elastically-resilient overmold sealing member seated in a recess disposed along the peripheral region of the lower housing member and extending about the peripheral region of the lower housing member. Internal components of the electrical switch units within the housing are not shown; and
- FIG. 4B shows a magnified top perspective cross-sectional view in rendered drawing form of an aspect of the electrical switch unit in FIG. 4A with the top housing member removed to reveal an elastically-resilient overmold sealing member seated in a recess disposed along the peripheral region of the lower housing member and extending about the peripheral region of the lower housing member. Internal components of the electrical switch units within the housing are not shown.
- FIGS. 1 to 4B of the drawings An embodiment of the present invention will now be described herein with reference to FIGS. 1 to 4B of the drawings.
- an electrical switch unit it would be appreciated that this is for illustrative purposes only and other embodiments of the inventive concept may be applicable in relation to other types of devices and assemblies. Further, it would be appreciated and understood that whilst this embodiment is described for use with an electric power tool, this is merely for purposes of illustrating functionality and alternate embodiments of the present invention may of course be used with other types of electrical devices such as gardening tools and home electrical appliances.
- the electrical switch includes terminals ( 150 ) and connector pins ( 160 ) extending outwardly from a surface of the assembled unit.
- the electrical switch unit ( 100 ) is shown comprising a first housing member ( 100 A) and a second housing member ( 100 B) which is configured for attachment to the second housing member (which will be referred as a “lower” and “upper” housing members respectively hereafter).
- the lower and upper housing members ( 100 A, 100 B) may be heled in attachment together by use of any suitable attachment mechanism such as a screw-type attachment mechanism, a friction fitting attachment mechanism or the like.
- the lower and upper housing members ( 100 A, 100 B) include respective peripheral edge regions ( 100 A′, 100 B′) that are configured for attachment together so that the lower and upper housing members ( 100 A, 100 B) may cooperatively form an enclosed space therebetween for housing various electrical and mechanical components ( 140 ) of the electrical switch unit ( 100 ) therein.
- electrical and mechanical components ( 140 ) may for instance include a pair of electrical switching contacts of the electrical switch unit, a reversing assembly ( 120 ) that is actuatable to reverse the direction in which the motor of the electrical device is driven, and at least a portion of a trigger actuator member ( 110 ) operably-connected with at least one of the pair of electrical switch contacts.
- the trigger actuator member ( 110 ) is configured for movement relatively inwardly and outwardly of an opening in the electrical switch unit housing ( 100 A, 100 B) so as to arrange the pair of electrical switch contacts into at least one of a closed configuration wherein power is able to be supplied from a power source of the electrical device to motor via the pair of electrical switch contacts, and, an opened configuration wherein power is not able to be supplied from the power source to the motor of the electrical device via the pair of electrical switch contacts.
- the peripheral edge region ( 100 A′) of the lower housing member ( 100 A) includes a recess disposed along the peripheral edge region ( 100 A′) that is configured for seating an elongate elastically-resilient polymeric sealing member ( 130 ) therein.
- the peripheral edge region ( 100 A′) may instead include a groove or a slot for seating the sealing member ( 130 ) therein.
- the sealing member ( 130 ) may also be maintained in position along the peripheral edge regions ( 100 A′, 100 B′) of the lower and upper housing members ( 100 A′, 100 B′) by use of an adhesive.
- the elongate elastically-resilient polymeric sealing member ( 130 ) is formed by extruding a material such as rubber, foam, or a thermoplastic material.
- the approximate cross-sectional dimensions of the sealing member ( 130 ) may be selected based on the specific user-requirements.
- the location of the sealing member ( 130 ) between the lower and upper housing members ( 100 A, 100 B) not only occludes passage and ingress of particulates and water into the electrical switch unit housing but also may provide some degree of dampening of vibrations so as to alleviate damage to the electrical switch unit components ( 140 ) therein.
- the elongate sealing member ( 130 ) also includes a saw-tooth cross-sectional shape profile.
- the sealing member ( 130 ) will abut against the peripheral region of the upper housing member.
- the cross-sectional saw-tooth shape contour of sealing member ( 130 ) will tend to contact with the upper housing peripheral region in such a manner to alleviate lateral movement relative to the upper housing member ( 100 B).
- the sealing element may be configured to complement a three-dimensional shape contour of the peripheral region of the lower or upper housing members ( 100 A, 100 B).
- the sealing member ( 130 ) is configured to not only extend about the peripheral edge region of the lower and upper housing members ( 100 A, 100 B) in a first two-dimensional plane, but also, includes a portion ( 130 A) that is configured to extend transversely from the two-dimensional plane in a curved contour.
- such an embodiment of the present invention is suitable for accommodating irregular or non-flat surface topologies of the housing members.
- the sealing member ( 130 ) is suitably shaped to accommodate a curved contour of a reversing module ( 120 ) of the electrical switch unit ( 100 ).
- the flexibility and versatility of the sealing member is able to accommodate even more complex three-dimensional shape contours of the housing member surface topologies.
- existing approaches which for instance utilise O-rings to effect sealing are limited in their degree of flexibility and versatility and are not suited for providing sealing along non-flat or irregular shaped surface topologies.
- the sealing element ( 130 ) may be formed by first forming the lower housing member ( 100 A) and upper housing members ( 100 B) from of a relatively hard plastic material. Thereafter, an overmolding technique may then be used to form a relatively soft elastically-resilient sealing member ( 130 ) on the peripheral edge region ( 100 A′) of the hard plastic lower housing member ( 100 A). The upper housing member ( 100 B) may thereafter be positioned for attachment with the lower housing member ( 100 A) with the sealing member ( 130 ) being sandwiched between the respective peripheral edge regions ( 100 A′, 100 B′) of the lower and upper housing members ( 100 A, 100 B).
- O-rings may be used in combination with the sealing member of this embodiments to provide additional sealing protection.
- an O-ring ( 170 ) may still be utilised to effect sealing about the aperture of the reversing module lever ( 120 ).
- a glue or resin may be used to provide sealing in regions about the openings in the housing where the terminal ( 150 ) and connector pins ( 160 ) of the electrical switch unit protrude outwardly.
- Such additional sealing means may complement the function of the sealing member ( 130 ) in preventing ingress of particulates nad water into the electrical switch unit housing.
- embodiments of the present invention may provide various advantages over the existing art.
- the novel application of a polymeric sealing member directly between the housing members of the electrical switch housing provides simple, low-cost and effective sealing to prevent ingress of particulates and water which may damage the components of the electrical switch unit.
- this reduces the relatively larger amount of materials, costs and complexity which may otherwise be required to effect sealing at the electrical switch box level rather than the electrical switch housing level.
- embodiments of the present invention utilise a sealing member which is better suited for effecting sealing between housing members of an electrical switch housing having non-flat or irregular shaped surface topologies or contours.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Switch Cases, Indication, And Locking (AREA)
- Push-Button Switches (AREA)
- Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/185,962 US20210183589A1 (en) | 2017-11-23 | 2021-02-26 | Electrical switch with a sealing member for use with an electrical device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HK17112336.9 | 2017-11-23 | ||
HK17112336 | 2017-11-23 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/185,962 Continuation US20210183589A1 (en) | 2017-11-23 | 2021-02-26 | Electrical switch with a sealing member for use with an electrical device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20190157019A1 true US20190157019A1 (en) | 2019-05-23 |
Family
ID=65728289
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/181,220 Abandoned US20190157019A1 (en) | 2017-11-23 | 2018-11-05 | Electrical switch with a sealing member for use with an electrical device |
US17/185,962 Pending US20210183589A1 (en) | 2017-11-23 | 2021-02-26 | Electrical switch with a sealing member for use with an electrical device |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/185,962 Pending US20210183589A1 (en) | 2017-11-23 | 2021-02-26 | Electrical switch with a sealing member for use with an electrical device |
Country Status (3)
Country | Link |
---|---|
US (2) | US20190157019A1 (de) |
CN (2) | CN109830391A (de) |
DE (2) | DE102018127261B4 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018127261B4 (de) * | 2017-11-23 | 2024-01-04 | Defond Components Limited | Elektrische Schaltereinheit mit einem Dichtungselement zur Verwendung bei einer elektrischen Vorrichtung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9337571B2 (en) * | 2013-01-28 | 2016-05-10 | Yazaki Corporation | Sealing member and sealing structure |
US9671813B2 (en) * | 2011-09-06 | 2017-06-06 | Omron Corporation | Trigger switch |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100466127C (zh) * | 2005-04-18 | 2009-03-04 | 创科实业有限公司 | 开关组件 |
DE202008007136U1 (de) | 2008-05-28 | 2009-10-01 | Grothe Gmbh | Kompakter Klingeltaster mit hoher mechanischer Stabilität und hohem Schutzgrad gegen Klima- und Vandalismus-Einflüsse |
JP6080359B2 (ja) | 2012-01-13 | 2017-02-15 | オムロン株式会社 | リミットスイッチ |
DE102014112982A1 (de) * | 2014-09-09 | 2016-03-10 | Johnson Electric Germany GmbH & Co. KG | Elektrischer Schalter |
CN105097321B (zh) * | 2015-09-30 | 2017-12-22 | 乐清市东科电气有限公司 | 一种直流调速开关 |
DE102018127261B4 (de) * | 2017-11-23 | 2024-01-04 | Defond Components Limited | Elektrische Schaltereinheit mit einem Dichtungselement zur Verwendung bei einer elektrischen Vorrichtung |
-
2018
- 2018-10-31 DE DE102018127261.8A patent/DE102018127261B4/de active Active
- 2018-10-31 DE DE202018106229.8U patent/DE202018106229U1/de active Active
- 2018-11-05 US US16/181,220 patent/US20190157019A1/en not_active Abandoned
- 2018-11-20 CN CN201811382622.XA patent/CN109830391A/zh active Pending
- 2018-11-20 CN CN201821920165.0U patent/CN209691630U/zh active Active
-
2021
- 2021-02-26 US US17/185,962 patent/US20210183589A1/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9671813B2 (en) * | 2011-09-06 | 2017-06-06 | Omron Corporation | Trigger switch |
US9337571B2 (en) * | 2013-01-28 | 2016-05-10 | Yazaki Corporation | Sealing member and sealing structure |
Also Published As
Publication number | Publication date |
---|---|
DE202018106229U1 (de) | 2019-02-26 |
US20210183589A1 (en) | 2021-06-17 |
DE102018127261B4 (de) | 2024-01-04 |
DE102018127261A1 (de) | 2019-05-23 |
CN109830391A (zh) | 2019-05-31 |
CN109830391A8 (zh) | 2019-07-02 |
CN209691630U (zh) | 2019-11-26 |
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Owner name: DEFOND COMPONENTS LIMITED, HONG KONG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DEFOND ELECTRICAL INDUSTRIES LIMITED;REEL/FRAME:053704/0415 Effective date: 20171123 Owner name: DONGGUAN CHEN DA APPLIANCE CO. LTD., CHINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DEFOND ELECTRICAL INDUSTRIES LIMITED;REEL/FRAME:053704/0415 Effective date: 20171123 Owner name: DEFOND ELECTRICAL INDUSTRIES LIMITED, HONG KONG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WONG, WAI MAN;NIEH, CHENG CHEN;REEL/FRAME:053704/0406 Effective date: 20171123 Owner name: DEFOND ELECTECH CO., LTD., CHINA Free format text: CHANGE OF NAME;ASSIGNOR:DONGGUAN CHEN DA APPLIANCE CO., LTD.;REEL/FRAME:053717/0575 Effective date: 20180622 |
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