Well tubing mandrel with combination guard, guide and latch arrangement

Claim 2

In a mandrel for use in a well tubing including: a. a body having an open bore extending therethrough for alignment with the well tubing; b. a valve receptacle formed in said mandrel body and offset from the open bore of said body; c. combination guard and guide means formed at the upper end of said valve receptacle and offset from the open bore of said body, said combination guard and guide including: 1. a body of generally semicircular shape having a portion which forms part of the mandrel body that is offset from the open bore of said mandrel body and is adjacent and above said valve receptacle; 2. said semicircular body including sides extending toward the open body bore to define the front of said combination guard and guide; 3. said sides each having a substantially vertical edge extending from the upper to the lower end of said body; 4. a tapering surface formed on the upper end of said body and extending generally inwardly and downwardly to form an opening in said guard and guide of a desired configuration to restrict access to said valve receptacle immediately therebelow; and d. projection means adjacent the lower end of said semicircular body and extending inwardly of said semicircular body to form lug means to assist in retaining a valve in said valve receptacle.

Claim 3

In a mandrel for use in a well tubing including: a. a body having an open bore extending therethrough for alignment with the well tubing; b. a valve receptacle formed in said mandrel body and offset from the open bore of said body; c. combination guard and guide means formed at the upper end of said valve receptacle and offset from the open bore of said body, said combination guard and guide including: 1. a body of generally semicircular shape having a portion which forms part of the mandrel body that is offset from the open bore of said mandrel body and is adjacent and above said valve receptacle; 2. said semicircular body including sides extending toward the open body bore to define the front of said combination guard and guide; 3. said sides each having a substantially vertical edge extending from the upper to the lower end thereof; 4. a tapering surface formed on the upper end of said body and extending generally inwardly and downwardly to form an opening in said guard and guide of a desired configuration to restrict access to said valve receptacle immediately therebelow; and 5. said semicircular body having a cut away portion adjacent the lower end thereof that terminates in spaced relation to the vertical edges of said sides whereby said sides extend longitudinally beyond said body to form in cooperation with the cut away portion of said semicircular body receiving surfaces for projection carrying means.

Claim 4

In a mandrel for use in a well tubing including: a. a body having an open bore extending therethrough for alignment with the well tubing; b. a valve receptacle formed in said mandrel body and offset from the open bore of said body; c. combination guard and guide means formed at the upper end of said valve receptacle and offset from the open bore of said body, said combination guard and guide including: 1. a body of generally semicircular shape having a portion which forms part of the mandrel body that is offset from the open bore of said mandrel body and is adjacent and above said valve receptacle; 2. said semicircular body including sides extending toward the open body bore to define the front of said combination guard and guide; 3. said sides each having a substantially vertical edge extending from the upper to the lower end thereof; 4. a tapering surface formed on the upper end of said body and extending generally inwardly and downwardly to form an opening in said guard and guide of a desired configuration to restrict access to said valve receptacle immediately therebelow; and 5. said semicircular body having a cut away portion adjacent the lower end thereof that terminates in spaced relation to the vertical edges of said sides whereby said sides extend longitudinally beyond said body to form in cooperation with the cut away portion of said semicircular body receiving surfaces for projection carrying means.