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
  • F16B37/00—Nuts or like thread-engaging members
  • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
  • F16B37/122—Threaded inserts, e.g. "rampa bolts"

Definitions

• the invention relates to a nut, especially for fitting in a hole in an object of eg. wood, chip board, plastic or similar semi-hard material or for embedding in plastic, bakelite or similar moulding material which nut is made of rolled up sheet metal and provided with punchings for forming lips bending outwards from the nut, said lips engaging the material when tightening a bolt screwed into the nut.
• Nuts of this kind are especially used for assemblies where the nut is to remain hidden in a bore in an object so that the assembly between a bolt and the nut can be separated according to requirements.
• the protruding lips extend at the lower section of the nut and protrude forwardly in the screwing in end of the nut for the bolt.
• the bolt can then be screwed out without the nut leaving its position in the hole because of the engagement of the lips in the wall and the resulting friction engagement.
• lips of this kind are moved in the screwing in direction of the bolt. Especially during the initial tightening the nut will often be somewhat turned particularly in cases where the fit between nut and hole is loose whereby the lips are easily twisted so that they cannot cut into the material when the longitudinal movement of the nut starts. This will of course result in lesser fastening abilities and, moreover, the lips will especially in hard materials easily break off so that the expected anchoring is not obtained.
• each lip forms a cutting edge pointing in the direction of tightening of the nut.
• This cutting edge is pointing in the direction of rotation of the bolt and can therefore not so easily break off just as particularly in hard materials it will more easily be capable of going into frictional engagement therewith because of the abilites of the cutting edge to cut into the wall.
• This nut may also be drawn out of the hole f.inst. by means of an unscrewing stud with a counter nut that may turn the nut and thus the cutting edges clear of the engagement so that the nut may be easily drawn out without damaging the material.
• Fig. 1 is a perspective view of the nut
• Fig. 2 is a cross-section of the nut with a bolt screwed in.
• the drawing shows a preferred embodiment of the nut comprising a bush 1 made by bending a piece of sheet metal being formed as a hollow cylindrical bush. At the top of the bush there is formed a flange 3 which is substantially at right angles to the longitudinal axis of the bush.
• the inside of the bush is provided with a screw thread 4 extending in the entire length thereof.
• a screw thread 4 extending in the entire length thereof.
• three cuts 7, 8, 9 for each lip 11 said cuts being a longitudinal cut 7 determining the height of the lip and two transverse cuts whereof the upper cut 8 is somewhat longer than the lower cut 9.
• the nut has been screwed into a blind hole in an object.
• a bolt 5 has been introduced into the nut and screwed into same.
• the cutting edges 2 have been cut into the material, and this material 6 has been carried towards the bolt 5. This accumulation of material will retain the nut in its screwed in position and thereby prevent an undesired loosening of the bolt and the nut.
• the nut is to be removed from the hole, this may by done by turning same in a direction opposite the direction of screwing in 10 whereby the cutting edges will be withdrawn from the material, and the nut can be easily turned out of the hole. This removal will not damage the wall of the object in the same way as the known nuts.
• a rim part 3 forming a collar on the nut.
• This collar will retain the nut against the surface of the object and will by use in chip boards, for example, ensure that the object is not damaged by even a strong tightening.
• the rim part 3 will create a counter-pressure against the downwards stress and so the upwards reaction of material which particularly in connection with chip boards is necessary for avoiding damage of the rim area.
• the nut according to the invention will also be suitable for embedding in plastic, bakelite or similar moulding material. Contrary to the known nuts the cutting edges 2 will cause no formation of slots in the surrounding material so that there is obtained a considerably stronger retaining force than previously seen.
• a contributory factor is the good distribution of stresses from the nut to the surrounding material.
• the transfer of force will substantially take place in directions downwards and outwards from the area around the cutting edges into the material where its strongest retaining force is present. The tendency to damages of the upper parts of material is thereby reduced.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Dowels (AREA)
• Joining Of Building Structures In Genera (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8134690

Family Applications (1)

Country Status (4)

Families Citing this family (4)

Family Cites Families (6)

• 1983
  • 1983-10-04 DK DK456383A patent/DK153904C/da not_active IP Right Cessation
• 1984
  • 1984-10-02 WO PCT/DK1984/000097 patent/WO1985001552A1/en not_active Ceased
  • 1984-10-02 EP EP19840903746 patent/EP0156902A1/de not_active Withdrawn
  • 1984-10-04 ES ES1984290198U patent/ES290198Y/es not_active Expired

Non-Patent Citations (1)

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