US74489A - Improvement in wood-soeews - Google Patents

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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
  • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
  • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
  • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
  • F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis
• • 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
  • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
  • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
  • F16B25/0015—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a soft organic material, e.g. wood or plastic
• • 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
  • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
  • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
  • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
  • F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections

Definitions

• Figure 3 is an end view. 4 V
• Figure 4 is an enlarged sectional view of a portion ⁇ of the screw, showingy clearly the form of the thread.
• the object of this invention is to construct a wood-screw which will penetrate wood more readily, and have a firmer hold than wood-screws hitherto made.
• my invention consists in a. wood-screw having a core, which tapers from the shanl: to the point, and a thread which does not taper, except at the entering-point ofthe screw, said thread being constructed with double convex sides, so as to increase the bearing-surface, and'add g'rcater strength to it, as will be hereinafter described.
• b represents the cylindrical shank or neck of the screw, which extends from the head to the point, c, where the screw-thread commences.
• the thread commences at'the.,circunnfer ⁇ V ence of the shank b, and gradui'ally increases ⁇ in depth, until the full depth ofthe screw isohtained, thereby producing the conical core e, which maybe more or less tapering, as desired.
• the core g upon which the full thread d is formed, commences at the termination of the conc-shoulder e, and continues to the entering-pointf, with a gradual taper, as shownin gs. 1 and 2.
• The'thr'ead d cl is of the same diameter as ,the shank b, from the point c to the point t, when it is gradually reduced, so as to form the ventering-point. It will be seen that the portion d of the thread of my screw abruptly increases in depth upon the conical shoulder e', and then gradually increases in depth from this point to the reduced' entering-cud. Instead of'maliing the surfaces of the thread at, as in some wood-screws hitherto, vI make these surfaces convex or rounding, as shown in figs. 2 and 4, so as to increase their thickness, and consequently increase the strength ofthe thread. The case of the thread also increases in thickness as it approaches the entering-point of the screw, so that it shall not have its strength diminished as it is increased in depth.A V

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Geometry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Dispersion Chemistry (AREA)
• Wood Science & Technology (AREA)
• Dowels (AREA)
• Golf Clubs (AREA)
• Joining Of Building Structures In Genera (AREA)

Description

Publications (1)

Family

ID=2143997

Family Applications (1)

Country Status (1)

Cited By (21)

• 0
  • US US74489D patent/US74489A/en not_active Expired - Lifetime

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