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US3874910A Expired / Lapsed US ⏱️ 0.0 years remaining

Spacer strip and method for making such spacer strips

Assignee: HAUPT WILHELM
•
Filing: 1973-08-20
•
Granted: 1975-04-01
•
Expires: 1993-08-20
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Abstract

Abstract The present spacer strips are used to form, for example, electrically heated mats, whereby the strips hold the elongated heating elements in a fixed position relative to each other. For this purpose the strips are provided with grooves into which the elements are inserted with a press-fit and preferably with an elastically yielding press-fit. The strips are further provided along the ends with coupling means for connecting several strips in series with each other. The present strips are formed by heating thermoplastic sheet material and stretching the sheet material over a grooving tool plate then the sheet is pressed or sucked into the grooves of the tool plate. After cooling and removal of the grooved sheet, the sheet is cut into strips whereby the cut extends substantially across the grooves. Preferably the strips are also provided with further grooves for receiving strap bars, whereby a plurality of strips may be connected in parallel to each other or whereby the strips may be secured to structural members.

Inventors

  • 👤 Dieter Altmann
  • 👤 Eberhard Haupt

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 23:40
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/34; B29C51/10; F; F24; F24D; F24D13/00; F24D13/02; F24D13/022; F24D13/024; F24D3/00; F24D3/12; F24D3/14; F24D3/141; H; H05; H05B; H05B3/00; H05B3/10; H05B3/16; B29L; B29L2007/00; B29L2007/001; B29L2031/00; B29L2031/30; B29L2031/3055; B29L2031/3061; Y; Y02; Y02B; Y02B30/00

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 88 words
A method of making spacer strips, especially for electrically heated mats, which strips receive and hold elongated elements in proper relationship relative to each other, comprising deforming thermoplastic sheet material to produce a plurality of elastically deformable grooves in said sheet material wherein said grooves extend substantially in parallel to each other and at given spacings from each other in said sheet material, and cutting the grooved sheet material into a plurality of independent strips so that the cuts extend substantially across the longitudinal extension of the grooves.
Claim 2
Independent Claim 88 words
A method of making spacer strips, especially for electrically heated mats, which strips receive and hold elongated elements in proper relationship relative to each other, comprising deforming thermoplastic sheet material to produce a plurality of elastically deformable grooves in said sheet material wherein said grooves extend substantially in parallel to each other and at given spacings from each other in said sheet material, and cutting the grooved sheet material into a plurality of independent strips so that the cuts extend substantially across the longitudinal extension of the grooves.
Claim 3
Dependent Claim 53 words
The method according to claim 1, further comprising clamping a sheet of thermoplastic material at its edges onto a grooving tool, heating the sheet material sufficiently for a thermoplastic deformation, deforming said heated sheet material into said grooving tool, cooling and removing the grooved sheet from the tool and then performing said cutting.
Claim 4
Dependent Claim 22 words
The method according to claim 2, wherein said deforming is accomplished by reducing the pressure below atmospheric pressure in said grooving tool.
Claim 5
Dependent Claim 24 words
The method according to claim 2, wherein said deforming is accomplished by pressing said heated thermoplastic material into respective grooves in said grooving tool.
Claim 6
Dependent Claim 14 words
The method according to claim 4, wherein said Pressing is accomplished by air pressure.
Claim 7
Dependent Claim 26 words
The method according to claim 1, further comprising forming flat spacer grooves in said sheet material substantially simultaneously with the formation of said element receiving grooves.
Claim 8
Dependent Claim 36 words
The method according to claim 1, further comprising forming, preferably simultaneously with said element receiving grooves, along a longitudinal edge of said sheet material, means for interconnecting a plurality of sheets or strips with each other.

References Cited (Backward Citations)

US3348265A Cited
US3515778A Cited
US3751541A Cited
US3619444A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-03-31 1978-09-30 1979-04-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-03-31 1982-09-30 1983-04-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-03-31 1986-09-30 1987-04-01 $7700.00 Window Closed / Lapsed

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