Latched telescoping members

{
  "publication_number": "US4043687A",
  "country": "US",
  "kind": "A",
  "title": "Latched telescoping members",
  "abstract": "This invention relates to a retractable locking pin for securing sections a telescoping mast when in extended position. The pin is mounted on the outer section and fits into a cylindrical recess in the inner section to give good azimuth registration between the two sections.",
  "claims": [
    "1. A locking mechanism for rigidly locking two telescoping members against relative movement comprising: a bushing threaded into a bore in one of said members, a pin having a stem portion slideably received within said bushing and a head portion adapted to project into a bore in the second of said members, spring means surrounding said stem portion of said pin and confined between said head portion and said bushing, a bracket rotatably mounted on the outer portion of said bushing, a triangular retracting plate pivotally mounted at one of its corners to said bracket and connected to another of its corners to the end of the stem portion of said pin, and means connected to the third corner of said plate for rotating the same about the corner pivoted to said bracket to retract said pin."
  ],
  "description_excerpt": "The device of the present invention is adapted for use with a vehicle mounted radar detection unit. The antenna for the radar is mounted on the top of a telescoping mast so that it can be raised for operation of the radar and lowered for transport from one position to another. Normal manufacturing techniques for telescoping masts permit azimuth tolerance buildup between telescoping sections resulting in azimuth errors in the radar signal detected. The use of close tolerance pins and close tolerance holes as provided by the present invention minimizes the azimuth errors. In accordance with the need it is an object of this invention to provide a vertical lock for each telescoping section of a mast which also maintains close azimuth registration between sections of the mast.\n\nFIG. 1 is a horizontal section through a mast illustrating the pin of the present invention. FIG. 2 is an exploded view illustrating the elements of the locking pin assembly of the invention.\n\nReferring now to the drawings, the pin assembly 10 comprises a bushing 12 externally threaded on its end as indicated at 14 to screw into a hole 16 provided in the outer section 18 of a telescoping mast 20. The bushing 12 is provided with a hexagonal external shoulder 22 which abuts the outer surface of section 18 of the mast 20. An L shaped bracket 30 has a hole 32 bored through one leg 33 and fits on the outer portion 34 of the bushing 12 and is retained by a snap ring 36 which fits in a groove 38. The outer leg 40 of bracket 30 is bifurcated to form two arms 42 and 44.",
  "cpc": [
    "H01Q 1/103",
    "F16B 7/10",
    "H01Q 1/10",
    "Y10T 403/32483"
  ],
  "ipc": [
    "F16B 7/10",
    "H01Q 1/10"
  ],
  "assignees": [
    "US ARMY"
  ],
  "inventors": [
    "VAN DYKE JR WILLIAM A",
    "BAKER FRANK S",
    "MCCLINTOCK ROBERT"
  ],
  "filing_date": "1976-04-12",
  "publication_date": "1977-08-23",
  "grant_date": "1977-08-23",
  "priority_date": "1976-04-12",
  "application_number": "US-67607276-A",
  "family_id": "24713116",
  "citations": [
    "US2061448A",
    "US3312487A",
    "US3685865A"
  ]
}