Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-02-27
1986-01-28
Hart, Charles
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
73 405R, H04N 718
Patent
active
045675147
ABSTRACT:
A conduit inspection sled comprises: a cage including longitudinally spaced adjustable collars for removably clamping a camera therein and a plurality of peripherally spaced and outwardly extending, elongated upper and lower struts connecting the collars on the upper and lower sides thereof; supports including elongated runners arranged on the lower side of the cage and elongated skids mounted on the upper struts; cables connected to opposite ends of the sled for transporting the same forwardly and rearwardly along the conduit; fore and aft links pivotally connecting the front and rear ends respectively of each lower strut and runner for relative movement toward and away from each other into retracted and extended sled positions respectively; inclined tension springs connecting the cage with the runners beyond the front end of the cage, and normally biasing the cage and runners into an extended sled position, wherein the runners slidably contact the inner periphery of the conduit and thereby normally center the camera substantially along the central longitudinal axis of the conduit; the springs also permitting such relative movement into a retracted sled position wherein the sled is allowed to clear an obstacle within the conduit; an adjustable stop on each runner and removably engageable with a stop retainer on each lower strut for limiting such relative movement to more than one extended sled position depending upon the interior size of the conduit; and an adjustable latch on each strut for ensuring positive engagement with a keeper on the trailing edge of each aft link for locking the sled in a fully retracted position obtained by pulling the rear cable and tensioning the front cable to collapse the sled into such fully retracted position, and thereby facilitate retrieval by reverse transport past an obstacle already cleared during forward transport.
REFERENCES:
patent: 3784740 (1974-01-01), Copland
patent: 3794340 (1974-02-01), Tartabini et al.
patent: 3832724 (1974-08-01), Duval
patent: 4168621 (1979-09-01), Kreitenberg
patent: 4194218 (1980-03-01), Hasegawa
Cherne Industrial, Inc., Technical Bulletin #31-9000, "It Doesn't Cost Much to Look", 1972.
Morgan William C.
Wagner, Sr. Richard A.
Hart Charles
Wag-Mor Corporation
Weber Robert C.
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