Title: Retractable landing shoulder for downhole devices

Abstract: A selective down-hole tool landing shoulder employing a housing with sliding internal sleeve member positionable between first and second detented positions within the housing. Resilient collet members, depending from the sleeve, carry radially inwardly extending bosses which define a full-bore opening with the sleeve in one position, and which are forced radially inwardly by camming action to define a restrictive bore as the sleeve is positioned to the second position.

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Other info:

Inventors: Raulins, George M. (Dallas, TX, US)

Application Number: 535958
Filing Date: 1974-12-23
Publication_date: 1976-02-10
Assignee: Otis Engineering Corporation (Dallas, TX)
Primary Class(es): 166/214
Other Classes:
US Patent Ref:

1193769	Aug, 1916	Cushing	166/136.
2447546	Aug, 1948	Spencer	166/136.
2606616	Aug, 1952	Otis	166/136.

Other Refs:
Primary Examiner: Leppink, James A.
Assistant Examiner:
Attorney: Kintzinger; Warren H.