WO2005002016B1 - Box with knock-out openings for electricalapparatus - Google Patents

Box with knock-out openings for electricalapparatus

Info

Publication number
WO2005002016B1
WO2005002016B1 PCT/GB2004/002776 GB2004002776W WO2005002016B1 WO 2005002016 B1 WO2005002016 B1 WO 2005002016B1 GB 2004002776 W GB2004002776 W GB 2004002776W WO 2005002016 B1 WO2005002016 B1 WO 2005002016B1
Authority
WO
WIPO (PCT)
Prior art keywords
region
knockout
enclosure
sheet
weakness
Prior art date
Application number
PCT/GB2004/002776
Other languages
French (fr)
Other versions
WO2005002016A1 (en
Inventor
Nigel Timothy Court
Original Assignee
Pittway Systems Technology Gro
Nigel Timothy Court
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 Pittway Systems Technology Gro, Nigel Timothy Court filed Critical Pittway Systems Technology Gro
Priority to EP04743124A priority Critical patent/EP1642367A1/en
Publication of WO2005002016A1 publication Critical patent/WO2005002016A1/en
Publication of WO2005002016B1 publication Critical patent/WO2005002016B1/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/081—Bases, casings or covers
    • H02G3/083—Inlets
    • H02G3/085—Inlets including knock-out or tear-out sections

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Insertion, Bundling And Securing Of Wires For Electric Apparatuses (AREA)
  • Packages (AREA)

Abstract

Knockout (22) circular shape is defined in enclosure (21) by circular groove (23) and has a cavity (27) extending in a generally radial directions and with a base surface inclined to the plane of knockout (22). Knockout (22) is attached to enclosure (21) by shearable material (26). The attachment between enclosure (21) and material (26) features sharp edge (24), while the attachment between knockout (22) and material (26) features arcuate edge (25). An operator employs tool (30) (e.g. a screwdriver blade) located by cavity (27), to apply force to the knockout (22) in order to tear material (26), detaching the knockout (22) from enclosure (21) and creating an aperture of a precise, predetermined size, suitable for insertion of a cable. The tear initiation point (40) corresponds with the comer of tool (30). Arcuate edge (25) serves to increase substantially the likelihood of shearable material (26) tearing near to sharp edge (24) when force is applied to knockout (22), thereby providing greater consistency in the dimensions and finish of the resulting aperture, by ensuring that material (26) is more resistant to shearing at arcuate edge (25).

Claims

AMENDED CLAIMS [Received by the International Bureau on 20 December 2004 (20.12.04): original claims 1-10 replaced by amended claims 1-9; (2 pages)]
1. A device comprising a sheet of material having a region of weakness to effect tearing in that region upon the application of force and focussing means for the tear force to effect precise tear propagation of material, the focussing means comprising a recess in the sheet of material directed to a region of material weakness, inclined to the main plane of the surface.
2. A device according to Claim 1 wherein the recess is sized to accommodate snugly a tool for the application of force to effect tearing.
3. A device according to Claim 1 or 2 wherein the recess is integral with the sheet.
4. A device according to any preceding claim comprising focussing means to effect tear propagation being tear initiation and progressive tearing.
5.. A device according to any preceding claim wherein the sheet of material has a defined edge of material in a region of material weakness to promote tearing.
6. A device according to any preceding claim wherein sheet material weakness in the region is promoted by one or more of the following:- (i) reduced thickness in that region; (ii) increased thickness in another region; (iii) scorings, perforations or other mechanical, thermal, chemical weakness in that region; (iv) use of different materials and/or density of materials.
AMENDED SHECT (ARTICLE '
7. A device according to any preceding claim wherein the material comprises one of the following :- • ABS thermoplastics; • Polycarbonate (PC) thermoplastics; • Mixtures of ABS and PC thermoplastics; • Polyester DMC.
8. An enclosure having a device according to any of Claims 1 to 6.
9. A duct having a device according to any of Claims 1 to 7.
10
PCT/GB2004/002776 2003-06-25 2004-06-25 Box with knock-out openings for electricalapparatus WO2005002016A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04743124A EP1642367A1 (en) 2003-06-25 2004-06-25 Box with knock-out openings for electrical apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0314809.5 2003-06-25
GB0314809A GB0314809D0 (en) 2003-06-25 2003-06-25 Enclosures

Publications (2)

Publication Number Publication Date
WO2005002016A1 WO2005002016A1 (en) 2005-01-06
WO2005002016B1 true WO2005002016B1 (en) 2005-02-24

Family

ID=27637320

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/002776 WO2005002016A1 (en) 2003-06-25 2004-06-25 Box with knock-out openings for electricalapparatus

Country Status (3)

Country Link
EP (1) EP1642367A1 (en)
GB (1) GB0314809D0 (en)
WO (1) WO2005002016A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011018796B3 (en) * 2011-04-28 2012-09-06 Jacob Gmbh Elektrotechnische Fabrik Bulkhead receptacle for cable, has detachment element that is provided in passage opening of partition wall equipped in cross-section of frame opening, and extended over partition wall
GB2571320B (en) * 2018-02-24 2023-06-21 Lawrence Carter Peter Spotlight bead

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2140886A5 (en) * 1971-06-11 1973-01-19 Telemecanique Electrique
DK11278A (en) * 1978-01-10 1979-07-11 Knudsen A S TERRING CLOSE

Also Published As

Publication number Publication date
GB0314809D0 (en) 2003-07-30
WO2005002016A1 (en) 2005-01-06
EP1642367A1 (en) 2006-04-05

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