Knuckle joint spearhead core drilling apparatus

For core drilling apparatus that includes a drill stem having a hollow bit end and a latch seat spaced from the bit end, an elongated core barrel inner tube assembly that includes means for collecting a core sample, a latch body connected to the core sample collecting means, detent means mounted by the latch body for movement between a latch seat engaging position and a retracted latch seat release position, release means for operating the detent means between the detent means latch seat engaging position and the latch seat release position, said release means being mounted on the latch body for axial movement relative thereto between an axial inner position that the detent means is extendable into the latch seat to latchingly engage the latch seat and an axial outer position that the detent means is retracted from the latch seat, and overshot coupling means attached to the release means for moving the release means between its positions, said coupling means including a base member, means for joining the base member to the release means, an overshot coupling member and means mounting the coupling member on the base member for movement about an axis transverse to the direction of axial movement of release means between its positions, each of the coupling member and the base member having a central axis, the coupling member being movable relative the base member between a position that the coupling member axis is substantially aligned with the base member axis and a position that the coupling member axis extends at substantial angle relative the base member axis, the coupling means including means mounted by one of the coupling member and the base member and acting in cooperation with the other of the coupling member and the base member to releasably retain said members in relative positions that their axes are substantially aligned, the last mentioned means comprising resiliently urged detent means mounted by the coupling member and resiliently retained in abutting relationship with the base member to releasably retain the said members in relative positions that their axes are substantially aligned, the base member having a recess for the last mentioned detent means to extend into when said member axes are substantially aligned.

For core drilling apparatus that includes a drill stem having a hollow bit end and a latch seat spaced from the bit end, an elongated core barrel inner tube assembly that includes means for collecting a core sample, a latch body connected to the core sample collecting means, detent means mounted by the latch body for movement between a latch seat engaging position and a retracted latch seat release position, release means for operating the detent means between the detent means latch seat engaging position and the latch seat release position, said release means being mounted on the latch body for axial movement relative thereto between an axial inner position that the detent means is extendable into the latch seat to latchingly engage the latch seat and an axial outer position that the detent means is retracted from the latch seat, and overshot coupling means attached to the release means for moving the release means between its position, said coupling means including a base member, means for joining the base member to the release means, an overshot coupling member and means mounting the coupling member on the base member for movement about an axis transverse to the direction of axial movement of release means between its positions, each of the coupling member and the base member having a central axis, the coupling member being movable relative the base member between a position that the coupling member axis is substantially aligned with the base member axis and a position that the coupling member axis extends at a substantial angle relative the base member axis, the coupling means including means mounted by one of the coupling member and base member and acting in cooperation with the other of the coupling member and the base member to releasably retain said members in relative positions that their axes are substantially aligned, the coupling member having an intermediate portion and legs joined to the intermediate portion and extending along transversely opposite sides of the base member, the intermediate portion having a bore opening between the legs toward the base member, the base member having a recess opening toward said bore when said members are in relative positions that their axes are substantially aligned, the coupling means including a detent plunger slidably mounted in said bore and extendable into said recess when said member axes are substantially aligned, and resilient means on the coupling member for resiliently retaining the plunger in abutting relationship to the base member, and the means for mounting the coupling member on the base member comprising a transverse pivot member pivotally connecting the legs to the base member to permit the coupling member being pivoted through an angle of about 180.degree..

For core drilling apparatus that includes a drill stem having a hollow bit end and a latch seat spaced from the bit end, an elongated core barrel inner tube assembly that includes means for collecting a core sample, a latch body connected to the core sample collecting means, detent means mounted by the latch body for movement between a latch seat engaging position and a retracted latch seat release position, release means for operating the detent means between the detent means latch seat engaging position and the latch seat release position, said release means being mounted on the latch body for axial movement relative thereto between an axial inner position that the detent means is extendable into the latch seat to latchingly engage the latch seat and an axial outer position that the detent means its retracted from the latch seat, and overshot coupling means attached to the release means for moving the release means between is positions, said coupling means including a base member, means for joining the base member to the release means, an overshot coupling member and means mounting the coupling member on the base member for movement about an axis transverse to the direction of axial movement of release means between its positions, each of the coupling member and the base member having a central axis, the coupling member being movable relative the base member between a position that the coupling member axis is substantially aligned with the base member axis and a position that the coupling member axis extends at a substantial angle relative the base member axis, the coupling means including means mounted by one of the coupling member and the base member and acting in cooperation with the other of the coupling member and the base member to releasably retain said members in relative positions that their axes are substantially aligned, the coupling member having an intermediate portion and legs joined to the intermediate portion and extending along transversely opposite sides of the base member, the means for mounting the coupling member on the base member comprising a transverse pivot member having a transverse pivot axis pivotally connecting the legs to the base member to permit the coupling member being pivoted through an angle of about 180.degree., the base member having an axially outwardly opening recess and a surface portion on one transverse of the pivot member and base member axes that converges toward the base member axis in an axial outer direction, the surface portion having an axial outer edge adjacent said recess and an axial inner edge axially on the opposite side of the pivot axis from the recess, and the coupling means having plunger means mounted by the coupling member and resiliently urged to extend into said recess when the base and coupling member axes are substantially aligned to releasably retain the base and coupling members in such a position and resiliently urged to abut against said surface portion when the base member axis extends at a substantial angle relative the coupling member axis to releasably retain the coupling member so that its axis extends to a preselected angle relative the base member axis.