Apparatus for making self-locking internally threaded articles

{
  "publication_number": "US3896760A",
  "country": "US",
  "kind": "A",
  "title": "Apparatus for making self-locking internally threaded articles",
  "abstract": "Method of and apparatus for making a self-locking internally threaded article such as a nut including a locking body or patch of normally hard, tough, resilient thermoplastic resin adhered to the threaded surface. The article is mounted on a support with the openings at the ends substantially free. A heater raises the temperature of the threaded portion to above the softening point of the resin and a powder jet and guide device directs a stream of fine particles of the resin entrained in a gaseous jet into one of the openings toward a selected area of the threaded surface. Suction is applied adjacent the other opening of the article to draw in air around the guide and through the threaded hole in the article. Resin particles contacting the threaded surface are caught by softening them and causing them to adhere to the threaded surface by heat from the threaded surface to build up a deposit of resin which is fused by heat from the surface to form a continuous plastic body and then hardened by cooling.",
  "claims": [
    "1. An apparatus for applying locking patches of normally hard, tough, resilient thermoplastic resin to internally threaded articles having openings at both ends of the threaded portion of the articles, comprising means for heating said articles to a temperature above the softening point of said resinous material, support means for holding said articles with the openings at the ends of the threaded portions substantially free, means providing a stream of fine particles of said resin entrained in a gaseous jet, guide means disposed to direct said jet and resin particles of said stream through a first opening of said threaded portion toward a selected area of the surface of said threaded portion and in a direction including a component toward the other of said openings for passage through said threaded portion and exit through said other opening and vacuum exhaust means adjacent said other opening in operative relation to draw air through said threaded portion to reduce deposition of resin particles in undesired areas of said articles and to draw off resin particles which have passed through said threaded portion.",
    "2. An apparatus for applying locking patches as defined in claim 1 in which said support means is constructed to hold said threaded article with its axis in up-and-down position, said guide means is disposed to direct said jet and resin particles upwardly through the lower opening of said article with a direction component for passage upwardly through said threaded portion and exit through the upper opening and a direction component toward a side, and said vacuum exhaust means is disposed adjacent an edge of said other opening on the side toward which said guide means directs said jet and resin particles.",
    "3. An apparatus for applying locking patches as defined in claim 2 in which the upper end of said guide means is disposed to protect the lowermost thread surface of a threaded article mounted on said support means.",
    "4. An apparatus as defined in claim 3 in which said guide means is an open trough and in which a shield member is disposed over a portion of said trough to shield the lower face of said threaded article against particles from said gaseous jet.",
    "5. An apparatus for applying locking patches as defined in claim 2 in which said guide means is inclined upwardly at an angle of 30* to about 60* from the horizontal.",
    "6. An apparatus for applying locking patches as defined in claim 2 in which said means for heating is an inductive heating coil disposed to heat the article while mounted on said support means."
  ],
  "description_excerpt": "United States Patent [1 Duffy [4 1 July 29, 1975 1 APPARATUS FOR MAKING SELF-LOCKING INTERNALLY THREADED ARTICLES Richard J. Duffy, Salem, Mass. [73] Assignee: USM Corporation, Boston, Mass. [22] Filed: Sept. 16, 1974 21 Appl. No.: 506,576 Related U.S. Application Data [60] Division of Ser. No. 400,502, Sept. 25, 1973, which is a continuation-in-part of Ser. No. 314,854, Dec. 13, 1972, abandoned. [75] Inventor: 3,416,492 12/1968 Greenleaf... 118/308 3,498,352 3/1970 Duffy 118/308 3,557,750 1/1971 Gallagher.... 118/308 3,601,085 8/1971 Lemelson 118/312 3,797,455 3/1974 Scheffer 118/308 Primary ExaminerMervin Stein Assistant ExaminerSteven Hawkins Attorney, Agent, or Firm-Benjamin C. Pollard; Vincent A. White; Richard B. Megley [57] ABSTRACT Method of and apparatus for making a self-locking internally threaded article such as a nut including a locking body or patch of normally hard, tough, resilient thermoplastic resin adhered to the threaded surface. The article is mounted on a support with the openings at the ends substantially free. A heater raises the temperature of the threaded portion to above the softening point of the resin and a powder jet and guide device directs a stream of fine particles of the resin entrained in a gaseous jet into one of the openings toward a selected area of the threaded surface. Suction is applied adjacent the other opening of the article to draw in air around the guide and through the threaded hole in the article.",
  "cpc": [
    "B05B 13/06",
    "B05B 14/10",
    "B05D 2202/00",
    "B05D 2258/02",
    "B05D 2401/32",
    "B05D 3/0218",
    "F16B 33/06",
    "F16B 39/34",
    "Y10S 470/906"
  ],
  "ipc": [
    "B05B 13/06",
    "B05B 15/04",
    "B05D 3/02",
    "F16B 33/06",
    "F16B 39/34"
  ],
  "assignees": [
    "USM CORP"
  ],
  "inventors": [
    "DUFFY RICHARD J"
  ],
  "filing_date": "1974-09-16",
  "publication_date": "1975-07-29",
  "grant_date": "1975-07-29",
  "priority_date": "1972-12-13",
  "application_number": "US-50657674-A",
  "family_id": "27405748",
  "citations": [
    "US3247004A",
    "US3294139A",
    "US3416492A",
    "US3498352A",
    "US3557750A",
    "US3601085A",
    "US3797455A"
  ]
}