Drill pipe protector

Claim 2

In a device for preventing wear between a drill string and a metal casing, said device including a cylindrical body of yieldable material with a gap on one side for application around a drill string, a rigid structural band being embedded in said body and being longitudinally split in said gap, the improvement comprising: hook members carried by said structural band on opposite sides of said gap, said hook members being turned radially outward; a retaining member bridging said gap and having hooked portions which engage inside said hook members to hold said cylindrical body contracted about a drill string, said retaining member being slidable lengthwise along said hook members for attachment to and detachment from said cylindrical body; at least one tab carried by one side of said structural band at said gap and extending beyond said hook member; an indentation carried by the other side of said structural band to receive said tab, said tab and indentation providing means for longitudinal alignment of said hook members when said hook members are brought near to each other for application of said retaining means.

Claim 3

The device according to claim 1 wherein said retaining member includes means for stopping the lengthwise movement thereof by abutment with one end of said hook members.

Claim 4

A device according to claim 1 wherein one of said tabs is located at each end of said hook members on one side of said gap and one of said indentations is located in a mating position at each end of the hook member on the other side of said gap.

Claim 5

A device according to claim 1 wherein said means for longitudinal alignment comprises one flat side of said tab positioned at an acute angle with respEct to the longitudinal axis of said cylindrical body and a flat side of said indentation parallel to the flat side of said tab.

Claim 6

In a device for preventing wear between a drill string and a metal casing, said device including a cylindrical body of yieldable material with a gap on one side for application around a drill string, a metal band being embedded in said body and being longitudinally split in said gap, the improvement comprising: hook members carried by such structural band on opposite sides of said gap, said hook members being turned radially outward; a retaining member bridging said gap and having hooked portions which engage inside said hook members to hold said cylindrical body contracted about the drill string, said retaining member being slidable lengthwise along said hook members for attachment to and detachment from said cylindrical body, said retaining member including means for stopping the lengthwise movement thereof by abutment with one end of said hook members; tabs carried by one side of said structural band at said gap at each end of said hook member, said tabs extending beyond said hook member, said tabs having one flat side positioned at an acute angle with respect to the longitudinal axis of said cylindrical body; indentations carried by the other side of said structural band at said gap at each end of said hook member, said indentations being adapted to receive the corresponding tab, said indentations having one flat side parallel with the flat side of the corresponding tab, said tabs and indentations providing means for longitudinal alignment of said hook members when said hook members are brought near to each other for application of said retaining means.

Claim 7

In a device for preventing wear between a drill string and a metal casing, said device including a cylindrical body of yieldable material with a gap on one side for application around a drill string, a metal band being embedded in said body and being longitudinally split in said gap, the improvement comprising: hook members carried by such structural band on opposite sides of said gap, said hook members being turned radially outward; a retaining member bridging said gap and having hooked portions which engage inside said hook members to hold said cylindrical body contracted about the drill string, said retaining member being slidable lengthwise along said hook members for attachment to and detachment from said cylindrical body, said retaining member including means for stopping the lengthwise movement thereof by abutment with one end of said hook members; tabs carried by one side of said structural band at said gap at each end of said hook member, said tabs extending beyond said hook member, said tabs having one flat side positioned at an acute angle with respect to the longitudinal axis of said cylindrical body; indentations carried by the other side of said structural band at said gap at each end of said hook member, said indentations being adapted to receive the corresponding tab, said indentations having one flat side parallel with the flat side of the corresponding tab, said tabs and indentations providing means for longitudinal alignment of said hook members when said hook members are brought near to each other for application of said retaining means.