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Instrument support

  • US 4,270,721 A
  • Filed: 09/22/1978
  • Issued: 06/02/1981
  • Est. Priority Date: 09/22/1978
  • Status: Expired due to Term
First Claim
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1. Apparatus for releasably attaching a surveying instrument to a vertical column, comprising:

  • (a) a tubular arm having an outer sleeve, an inner sleeve slidable within said outer sleeve, and a locking mechanism for fixing said outer sleeve relative to said inner sleeve;

    (b) clamping means at one end of said arm, said clamping means including a generally U-shaped base including a pair of legs, an adjustable clamping screw threadedly engaging one of said legs;

    (c) universal joint coupling means connecting said arm to said clamping means, said universal joint including locking means for holding said arm in fixed orientation;

    (d) means carried by said arm remote from said clamping means for connecting a surveying instrument thereto;

    (e) a level indicator carried by said arm; and

    (f) a clamping member adapted for releasably attachment to a massive vertical column and carrying a projecting flange adapted for engagement by said clamping means.

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