WO2015043924A1 - Boîtier pour appareil électroménager - Google Patents

Boîtier pour appareil électroménager Download PDF

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Publication number
WO2015043924A1
WO2015043924A1 PCT/EP2014/068922 EP2014068922W WO2015043924A1 WO 2015043924 A1 WO2015043924 A1 WO 2015043924A1 EP 2014068922 W EP2014068922 W EP 2014068922W WO 2015043924 A1 WO2015043924 A1 WO 2015043924A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
screw
panel
panels
cutout
Prior art date
Application number
PCT/EP2014/068922
Other languages
English (en)
Inventor
Ramesh Mohan
Mahantesh NIMBARAGI
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
Robert Bosch Engineering And Business Solutions Limited
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 BSH Bosch und Siemens Hausgeräte GmbH, Robert Bosch Engineering And Business Solutions Limited filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to EP14761614.8A priority Critical patent/EP3099950A1/fr
Publication of WO2015043924A1 publication Critical patent/WO2015043924A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/282—Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
    • F16B2200/93—Fastener comprising feature for establishing a good electrical connection, e.g. electrostatic discharge or insulation feature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/02—Nuts or like thread-engaging members made of thin sheet material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/34—Conductive members located under head of screw
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail

Definitions

  • the present invention relates to a casing for a household appliance, in particular to the problem of grounding components of the casing.
  • a household appliance such as a refrigerator, a freezer, a kitchen stove, a dishwasher or a washing machine has a casing the outer surface of which comprises large portions made of sheet metal which must be reliably grounded. If one of these components is directly connected to a ground conductor, other components can be grounded by establishing electrical contact to said first component when the appliance is assembled.
  • such a contact is achieved using a screw which extends through holes of a first and a second panel of the appliance casing and the head of which is serrated in order to scratch through a paint layer of the first panel and thus establish an electrical contact with the sheet metal underneath, and in which the hole of the second panel has serrated edges which will be bent in contact with the shank of the screw and thereby enter into conductive contact.
  • the object of the present invention is to provide a casing for an electrical appliance in which an electrical contact between two casing panels made of sheet metal is reliably re- established if the panels are repeatedly disassembled and re-assembled.
  • a casing for an electrical appliance comprising at least two casing panels made of sheet metal and a screw for fixing said two panels to each other and establishing an electrically conductive junction between them, wherein a first one of said panels has a first cutout formed in a region which overlaps said second panel, and said second panel has a second cutout which overlaps said first cutout the screw extending through said cutouts, and at least one boss which engages said first cutout.
  • a head of said screw should be in contact with said first panel and with said boss of the second panel. It should be noted, however, that this is not the only way by which, according to the present invention, an electric contact between the screw and the second panel can be ensured, and that others will be described subsequently.
  • a serrated surface of said screw head may be used for scratching the first panel and the boss of the second panel alike.
  • the electric contact can be improved by said first and second panels being clamped between a support and said screw head.
  • both should preferably have a same thickness.
  • a surface of the support facing the screw head may be flat.
  • the overlapping cutouts of first and second panels define a screw hole, a circumferential surface of which is formed in part by edge portions of said first panel and in part by edge portions of said second panel.
  • a ridge of said screw may then establish an electrical connection by being in contact with edge portions of both panels.
  • the portion of the ridge which passes through the screw hole extends along the circumference of the screw over a length equaling the thickness of said panels, multiplied by the circumference length of the screw and divided by its pitch. If the edge portions are shorter than this, the ridge will always be in contact with edge portions of both panels, regardless of the orientation of this ridge portion.
  • Said first cutout can comprise a central portion and a plurality of branches extending radially from said central portion. The bosses of said second panel may then engage said branches, leaving the central portion for the passage of the screw.
  • the first panel may then comprise a plurality of fingers extending radially towards said central portion between said branches, and the edge portions of said first panel can be provided at the tips of said fingers.
  • said second cutout may comprise a central portion and plurality of branches which extend radially from said central portion between said bosses.
  • the fingers of the first panel can engage in the branches of said second cutout.
  • the bosses may be provided on a plurality of fingers of said second panel, the fingers extending radially towards said central portion between said branches. Again, the edge portions of said second panel can be provided at the tips of said fingers.
  • the fingers of the second panel may be cranked to form said bosses.
  • the casing of the present invention may belong to a cooling appliance.
  • one of said panels may be part of a sidewall of said casing whereas the other is a traverse extending underneath a machinery compartment.
  • Fig. 1 is an exploded perspective view of panels of a refrigerator casing according to the present invention
  • Fig. 2 is an enlarged view of cutouts formed in the panels of Fig. 1 ;
  • Fig. 3 is a perspective view of bosses of a second panel engaging the cutout of the first panel;
  • Fig. 4 is a cross section along lines IV-IV of Fig. 3 according to a first embodiment of the invention;
  • Fig. 5 is a cross section along lines IV-IV of Fig. 3 according to a second
  • Fig. 6 is a cross section along lines IV-IV of Fig. 3 according to a third embodiment.
  • Fig. 1 is a perspective view of sidewall panels 1 , 2 and of a traverse panel 3 of a refrigerator casing according to the present invention.
  • the sidewall panels 1 , 2 are made from painted sheet metal.
  • Each comprises a vertical member 4 which forms an outer side of a sidewall of the refrigerator casing, and a horizontal flange 5 which extends inwardly from a bottom edge of vertical member 4.
  • the reinforcement member 6 comprises a plate-shaped hollow body injection-molded from plastics material.
  • the reinforcement member 6 comprises a plate-shaped hollow body injection-molded from plastics material.
  • one of the two main sides 7 of reinforcement member 6 body is in contact with an inner side of vertical member 4, a narrow side 8 is in contact with flange 5, and the other main side 7 delimits a machinery compartment 9 which, as usual in the art, is formed in a bottom rear portion of the refrigerator casing.
  • a similar reinforcement member, not shown, is associated to sidewall panel 2.
  • the traverse panel 3, subsequently also referred to as traverse 3, extends underneath said machinery compartment, supporting components installed in the machinery compartment, such as a compressor and, possibly, a fan, a condenser etc., and is connected to sidewall panels 1 , 2 by means of screws 10 engaging cutouts 1 1 , 12 of flanges 5 and traverse 3 and holes 13 of reinforcement members 6.
  • the screws 10 are machine screws having a constant diameter thread 24 and a head 25.
  • An underside of head 25, i.e. the side facing flange 5 and traverse 3 in Fig. 1 is serrated so that when the screw 10 is driven into hole 13 and its head comes to abut against flange 5 and traverse 3, it will scratch through a paint layer formed thereon and provide electrically conductive metal-to-metal contact with both.
  • Fig. 2 is an enlarged view of the cutouts 1 1 , 12 of flange 5 and traverse 3. While Fig. 1 is a perspective view of panels 1 , 2, 3 from below; showing these in the orientation they would normally have in the refrigerator casing, in Fig. 2 the flange 5 and the traverse 3 are shown in a turned-over configuration, i.e. bottom sides of flange 5 and traverse 3 are turned up and are shown as seen from above.
  • the cutout 1 1 of traverse 3 comprises a circular central portion 14 and four branches 15 extending radially outward from said central portion 14.
  • Each branch 15 is shaped as a 45° circle sector, with the center of the circle sectors coinciding with the center of central portion 14.
  • the cutout 12 of flange 3 is similar in shape to cutout 1 1 , having a circular central portion 18 and branches 19 extending therefrom. Fingers 20 of flange 3 extend between said branches 19 and are cranked so as to form bosses 21 . Again, the tips of fingers 20 are shaped as circular arcs 22.
  • the thread 24 of screw 10 comprises a cylindrical core and one or more ridges extending helicoidally around said core.
  • the radius of screw hole 23 is larger than the radius of said core and smaller than the radius of the core plus the width of the ridge, so that when the screw 10 is driven into screw hole 23, the ridge will rub along the edge of screw hole 23 along a helicoidal path 26.
  • the thread 24 may e.g. be a M5 thread, in which case the diameter of screw hole can be 4.9 mm.
  • the M5 thread has a pitch of 0.8 mm, so that if the sheet metal of flange 5 and traverse 3 is e.g. 0.25 mm thick, in the portion of thread 24 received in screw hole 23, the path 26 spans an angle of
  • Fig. 4 is a cross section of reinforcement member 6, flange 5 and traverse 3 taken along line IV-IV of Fig. 3 according to a first embodiment.
  • traverse 3 is flat.
  • Flange 5 and traverse 3 have a same thickness, and boss 21 is cranked out of the plane of flange 5 so that inner and outer sides of boss 21 are flush with those of traverse 3.
  • traverse 3 and flange 5 combine to form a shallow indentation which is engaged by a flat boss 27 of
  • a metal nut 29 may be embedded reinforcement member 6, forming within hole 13 a female thread in which screw 10 is reliably held.
  • the narrow side 8 of reinforcement member 6 is flat, and so is flange 5. Instead, fingers 16 of traverse 3 are cranked, so as to form bosses which engage branches 19 of flange 5. If these bosses do not yet touch reinforcement member 6, as shown in Fig. 6, they will be pressed into contact therewith when urged by screw head 25.
  • Fig. 6 illustrates a case where the thickness of traverse 3 and flange 5 is not identical.
  • fingers 16 of traverse 3 are cranked and have an outer side, facing the serrations 28 of screw head 25. This outer side is closer to screw head 25 than the outer side of flange 5 is. Therefore, when screw 10 is tightened, screw head 25 will first abut against fingers 16, bend these until their tips, i.e. arcs 17, abut against reinforcement member 6, and the outer edge of screw head 25 will dig into fingers 16.
  • the screw 10 is turned slightly further, its serrations 28 will abut against the fingers 20 of flange 5, too, and will scratch these, whereby a further electrical contact between traverse 3 and flange 5 is established via screw head 25.
  • traverse 3 is screwed under the flanges 5 of sidewall panels 1 , 2 from underneath.
  • traverse 3 might be clamped between the flanges 5 and the reinforcement members 6, i.e. elements designated as flange 5 in Figs. 4-6 might be part of traverse 3 and vice versa.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Connection Of Plates (AREA)
  • Casings For Electric Apparatus (AREA)

Abstract

La présente invention se rapporte à un boîtier destiné à un appareil électroménager comprenant au moins deux panneaux (1, 3) de boîtier composés de tôle et une vis destinée à fixer deux panneaux (1, 2, 3) l'un à l'autre et à établir une jonction électroconductrice entre eux. Un premier (3) desdits panneaux possède une découpe formée dans une région qui recouvre ledit second panneau (1), ledit second panneau (1) possédant une seconde découpe qui recouvre ladite première découpe et au moins un bossage (21). La vis (10) s'étend dans une partie de recouvrement (23) desdites découpes, et le bossage (21) entre en prise avec ladite première découpe.
PCT/EP2014/068922 2013-09-30 2014-09-05 Boîtier pour appareil électroménager WO2015043924A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14761614.8A EP3099950A1 (fr) 2013-09-30 2014-09-05 Boîtier pour appareil électroménager

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN4455/CHE/2013 2013-09-30
IN4455CH2013 IN2013CH04455A (fr) 2013-09-30 2014-09-05

Publications (1)

Publication Number Publication Date
WO2015043924A1 true WO2015043924A1 (fr) 2015-04-02

Family

ID=51494285

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/068922 WO2015043924A1 (fr) 2013-09-30 2014-09-05 Boîtier pour appareil électroménager

Country Status (3)

Country Link
EP (1) EP3099950A1 (fr)
IN (1) IN2013CH04455A (fr)
WO (1) WO2015043924A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017102290A1 (fr) * 2015-12-15 2017-06-22 Electrolux Appliances Aktiebolag Four de cuisson
CN107763038A (zh) * 2016-08-19 2018-03-06 富士施乐株式会社 紧固目标构件以及紧固结构
WO2021034198A1 (fr) * 2019-08-21 2021-02-25 Minkels B.V. Assemblage d'une partie en tôle mince et d'une partie de substrat à laquelle la partie en tôle mince est reliée

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2149114A (en) * 1935-04-25 1939-02-28 Reconstruction Finance Corp Refrigerator
US4040694A (en) * 1974-12-12 1977-08-09 La Telemecanique Electrique Framework for metal cabinet
US4116510A (en) * 1977-03-03 1978-09-26 Gte Automatic Electric Laboratories Incorporated Chassis formed of sheet stock
US4557537A (en) * 1984-05-21 1985-12-10 General Electric Company Electrical grounding arrangement and method
US4632470A (en) * 1985-06-28 1986-12-30 General Electric Refrigerator cabinet and method of assembly
DE202010007769U1 (de) * 2010-06-09 2010-08-19 Acument Gmbh & Co. Ohg Elektrisch leitende Schraubverbindung und Spezialschraube für eine solche Schraubverbindung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2149114A (en) * 1935-04-25 1939-02-28 Reconstruction Finance Corp Refrigerator
US4040694A (en) * 1974-12-12 1977-08-09 La Telemecanique Electrique Framework for metal cabinet
US4116510A (en) * 1977-03-03 1978-09-26 Gte Automatic Electric Laboratories Incorporated Chassis formed of sheet stock
US4557537A (en) * 1984-05-21 1985-12-10 General Electric Company Electrical grounding arrangement and method
US4632470A (en) * 1985-06-28 1986-12-30 General Electric Refrigerator cabinet and method of assembly
DE202010007769U1 (de) * 2010-06-09 2010-08-19 Acument Gmbh & Co. Ohg Elektrisch leitende Schraubverbindung und Spezialschraube für eine solche Schraubverbindung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017102290A1 (fr) * 2015-12-15 2017-06-22 Electrolux Appliances Aktiebolag Four de cuisson
CN108368867A (zh) * 2015-12-15 2018-08-03 伊莱克斯家用电器股份公司 烹饪炉
AU2016369915B2 (en) * 2015-12-15 2021-04-01 Electrolux Appliances Aktiebolag Cooking oven
US11525472B2 (en) 2015-12-15 2022-12-13 Electrolux Appliances Aktiebolag Cooking oven
CN107763038A (zh) * 2016-08-19 2018-03-06 富士施乐株式会社 紧固目标构件以及紧固结构
WO2021034198A1 (fr) * 2019-08-21 2021-02-25 Minkels B.V. Assemblage d'une partie en tôle mince et d'une partie de substrat à laquelle la partie en tôle mince est reliée
NL2023676B1 (en) * 2019-08-21 2021-04-13 Legrand France Assembly of a thin sheet metal part and a substrate part to which the thin sheet metal part is connected
DE212020000703U1 (de) 2019-08-21 2022-03-29 Legrand France Anordnung eines dünnen Blechteils und eines Substratteils, mit dem das dünne Blechteil verbunden ist

Also Published As

Publication number Publication date
IN2013CH04455A (fr) 2015-04-03
EP3099950A1 (fr) 2016-12-07

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