US1203788A - Flexible electrical conduit. - Google Patents

Flexible electrical conduit. Download PDF

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Publication number
US1203788A
US1203788A US70131512A US1912701315A US1203788A US 1203788 A US1203788 A US 1203788A US 70131512 A US70131512 A US 70131512A US 1912701315 A US1912701315 A US 1912701315A US 1203788 A US1203788 A US 1203788A
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US
United States
Prior art keywords
flexible electrical
electrical conduit
conduit
twisted
strip
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.)
Expired - Lifetime
Application number
US70131512A
Inventor
William C Robinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NATIONAL METAL MOLDING Co
NAT METAL MOLDING Co
Original Assignee
NAT METAL MOLDING Co
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Publication date
Application filed by NAT METAL MOLDING Co filed Critical NAT METAL MOLDING Co
Priority to US70131512A priority Critical patent/US1203788A/en
Application granted granted Critical
Publication of US1203788A publication Critical patent/US1203788A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D3/00—Woven fabrics characterised by their shape

Definitions

  • the present invention is an improvement upon that described in United States Letters Patent No. 652,806.
  • Figure 1 is a View, partlyl in section, of'a section of conduit embodying the invention.
  • Fig. 2 represents (on a larger scale) a strand of paper or like material formed of strips twisted together.
  • Fig. 3 is a cross-section of the twisted circular' strand on the line III--III of Fig. 2.
  • Fig. 4 includes enlarged views in plan and in cross-section of the flattened strip which is used as the semiiiexible member of the conduit. y
  • a conduit consisting of a helix formed of a Hat strand of twisted paper, in combination with flexible material interwoven therewith.

Description

WITNESSESI W. C. ROBINSON.
FLEXIBLE ELECTRICAL CONDUIT.
APPLICTION FILED JUNE 3. 1912.
Patented Nov. 7, 1916.
NTOR
UNITED STATES PATENT oEEIcE.
WILLIAM C. ROBINSON, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO NATIONAL METAL MOLDING COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION 0F PENNSYLVANIA.
FLEXIBLE ELECTRICAL CONDUIT.
Specification of Letters Patent.
Patented Nov. 7, 1916.
Application led June 3, 1912. Serial No. 701,315.
To all whom t may concern Be it known that I, WILLIAM C. ROBINSON, residing at Pittsburgh, in the county of A1- legheny and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in Flexible Electrical Conduits, of which improvements the following is a specification.
The present invention is an improvement upon that described in United States Letters Patent No. 652,806.
In the accompanying .drawings Figure 1 is a View, partlyl in section, of'a section of conduit embodying the invention. Fig. 2 represents (on a larger scale) a strand of paper or like material formed of strips twisted together. Fig. 3 is a cross-section of the twisted circular' strand on the line III--III of Fig. 2. Fig. 4 includes enlarged views in plan and in cross-section of the flattened strip which is used as the semiiiexible member of the conduit. y
In order to form the semi-iexible member of the conduit I crumple and twist together a number of strips of thin paper or a similar material as generally indicated at 1 in Fig. 2. A single strip lof paper of suiiicient width may be so twisted, and if desired the strip or strips may'have appliedp to them an insulating varnish or sizing.
This forms a twisted strand which is circular in cross-section, as shown in Fig. 3. Then I Hatten the twisted strand in any suitable way, as by passing it between pressure rollers, thus forming a comparatively thin strip, shown in Fig. 4, which I have found possesses the necessary firmness and strength for use in a conduit in the'manner described in the Letters Patent above referred to. It possesses the advantages over the helically coiled member Iof the said Letters Patent, that while quite rm and strong, it is also relatively thin and of light weight. Having formed this semi-iexible strip 1, I proceedto coil. it helically as shown in Fig. 1 of the accompanying drawings, and then interweave with said strip strands 2 of thread, yarn or any similar fiexible Inat`erial.
I claim as my invention:
A conduit consisting of a helix formed of a Hat strand of twisted paper, in combination with flexible material interwoven therewith.
v "In testimony whereof I have hereunto set my hand.
WILLIAM o. ROBINSON.
Witnesses: c FRANCIS J. ToMAssoN, 'J. HERBERT BRADLEY.
US70131512A 1912-06-03 1912-06-03 Flexible electrical conduit. Expired - Lifetime US1203788A (en)

Priority Applications (1)

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US70131512A US1203788A (en) 1912-06-03 1912-06-03 Flexible electrical conduit.

Applications Claiming Priority (1)

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US70131512A US1203788A (en) 1912-06-03 1912-06-03 Flexible electrical conduit.

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US1203788A true US1203788A (en) 1916-11-07

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US70131512A Expired - Lifetime US1203788A (en) 1912-06-03 1912-06-03 Flexible electrical conduit.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745444A (en) * 1952-07-26 1956-05-15 Kraft Paper Products Ltd Woven matting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745444A (en) * 1952-07-26 1956-05-15 Kraft Paper Products Ltd Woven matting

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