US1524570A - Tubular fiber plug for walls and the like - Google Patents

Tubular fiber plug for walls and the like Download PDF

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Publication number
US1524570A
US1524570A US723573A US72357324A US1524570A US 1524570 A US1524570 A US 1524570A US 723573 A US723573 A US 723573A US 72357324 A US72357324 A US 72357324A US 1524570 A US1524570 A US 1524570A
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US
United States
Prior art keywords
strands
plug
twisted
walls
tubular
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
US723573A
Other languages
English (en)
Inventor
Rawlings John Joseph
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.)
Rawlplug Co Ltd
Original Assignee
Rawlplug Co Ltd
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
Priority to NL16024D priority Critical patent/NL16024C/xx
Application filed by Rawlplug Co Ltd filed Critical Rawlplug Co Ltd
Priority to US723573A priority patent/US1524570A/en
Application granted granted Critical
Publication of US1524570A publication Critical patent/US1524570A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/14—Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor

Definitions

  • This invention relates to tubular plugs for insertion in brick, stone, or other hard 10 building material and intended as fixings for screws, and more particularly to such tubular plugs made of jute, flax, asbestos, hair or other fibrous material.
  • the uired grip is obtained by the expansion 0 the wall of the plug produced by the insertion of the screw.
  • the plug is made from twisted strands of fiber or cord or paper or the like, arranged in spiral formation, and cemented or otherwise held together to form a tube having spiral lines of weakness.
  • the spiral arrangement of the strands is contrary to that of the twist of the individual strands. That is to 95 say, if the strands have a. left hand twist, then the spiral arrangement of the strands forming the tube is rlght-handed, and vice versa.
  • the spiral arrangement of the twisted strands forming the plug shall be in the contrary direction to that of the screw with which the plug is to be used. This arra ment avoids or minimizes the cutting of t e cord strands by the threads of the screw.
  • the strain which resists the withdrawal of a lug from a. hole in which it is fixed is distri uted circumferentiall round the wall of the hole, and any pu l on the screw tends to shorten the plug and expand its 40 diameter and so sets up a tighteningl action of the strands against the wall of t e hole, thereby ensuring increased grip.
  • the pitch of the spiral arrangement may be varied considerably.
  • Figure 1 shows a plug made from six twisted strands or cords.
  • Figure 2 shows a plug made from six large cords combined with a similar number of smaller cords;
  • Figure 3 shows a plu double layer of twisted cor s.
  • Figure 4 shows a plug made from soft twisted cords or strands which assume a segmental form.
  • Each of the strands a, a consists of twisted fiber, paper or the like, or cord, and the several strands are wound side by side in spiral formation as indicated to make a tubular plug, the whole being cemented and pressed together in a known manner.
  • the strands are preferably twisted right- 6 handed; the best number of strands to use is six which leaves a centre hole at the core of the same diameter as the individual cords. The number of strands may however be varied with good results.
  • the strands a may be twisted to form the plugs whilst immersed in glue or cement, or, they may first be twisted together to form the tube, after which the tube is immersed in lue or cement mixture, drawn through ies, dried and hardened and then cut into plugs of the required len h.
  • This last described method has the a vantage of preventing access of the glue or cement into the interior of the plug and so reducing the friction when a screw is turned into position in the plug.
  • the spaces between a joining strands or cords should be filled so that the plug can obtain the maximum surface grip, and to do this the interstices may be filled with thick glue or cement that may be loaded with earthy or fibrous matter, or the space may be filled with smaller sectioned cord; 12, b as shown in Figure 2.
  • Lar e plugs may have two layers of twiste strands or cords, as shown in Figure 3. lhese layers may be twisted in the same or in opposite directions.
  • the plugs may be made in a continuous comprising a length, from cords or'strands fed from a series of spindles mounted in a rotary frame spirally in a tubular formation and held toi gether by an adhesive cement.
  • a socket for lining a hole for rece1vin a screw comprising a plura it of strands of fibrous material in whic the fibers are twisted in the same direction, and the said strands are twisted in the opposite direction in a spiral formation to form a tubular structure.
  • a socket for lining a hole for'receivin a screw comprising a plura ity of strands of fibrous material in which the fibers are twisted in the same direction, and the said strands are twisted in the opposite direction in a spiral formation to form a tubular structure in which the adjacent strands are weakly held together along spiral lines.
  • a socket for lining a hole for receivn a screw said socket comprising a plurality of strands of fibrous material arran ed spirall hell? together i; of contact.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ropes Or Cables (AREA)
US723573A 1924-07-01 1924-07-01 Tubular fiber plug for walls and the like Expired - Lifetime US1524570A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL16024D NL16024C (cs) 1924-07-01
US723573A US1524570A (en) 1924-07-01 1924-07-01 Tubular fiber plug for walls and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US723573A US1524570A (en) 1924-07-01 1924-07-01 Tubular fiber plug for walls and the like

Publications (1)

Publication Number Publication Date
US1524570A true US1524570A (en) 1925-01-27

Family

ID=24906817

Family Applications (1)

Application Number Title Priority Date Filing Date
US723573A Expired - Lifetime US1524570A (en) 1924-07-01 1924-07-01 Tubular fiber plug for walls and the like

Country Status (2)

Country Link
US (1) US1524570A (cs)
NL (1) NL16024C (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2553614A (en) * 1949-01-14 1951-05-22 Arthur J Valluzzi Anchoring plug for walls
US4289427A (en) * 1979-02-07 1981-09-15 Owens-Corning Fiberglas Corporation Process for installing roof bolts

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2553614A (en) * 1949-01-14 1951-05-22 Arthur J Valluzzi Anchoring plug for walls
US4289427A (en) * 1979-02-07 1981-09-15 Owens-Corning Fiberglas Corporation Process for installing roof bolts

Also Published As

Publication number Publication date
NL16024C (cs)

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