Auxiliary Shaft having a ball-shaped end releasably mounted in a two-part sleeve, for hand tools

A three-part, auxiliary, back-saving safety shaft assembly to be mounted along a hand-tool shaft having a tool, and for said shaft assembly to be mounted near said tool, on said hand tool shaft, comprising:

• an auxiliary shaft, and a two-part sleeve,
• said auxiliary shaft having one end and another end,
• said one end of said auxiliary shaft being ball-shaped,
• said ball-shaped end having a diameter, and a center,
• said sleeve having a top, a bottom, and a symmetrical axis running from said top to said bottom,
• and said sleeve being cut in half along said symmetrical axis to define the two parts of said two-part sleeve,
• each part of said two-part sleeve, defining:
• an inner hemi-housing parallel to said symmetrical axis of said sleeve, and running from said top to said bottom of said sleeve, for tight fitting of half the cross-section of a portion of a hand-tool shaft having a tool, and said portion of a hand-tool shaft being near said tool,
• and each part of said two-part sleeve further defining an inner hemi-spherical housing for receiving half of said ball-shaped end of said auxiliary shaft, said inner hemi-spherical housing having a center,
• said hemi-spherical housing for receiving half of said ball-shaped end of said auxiliary shaft, being adjacent to said top of said sleeve, and spaced from said inner hemi-housing for said tight fitting of half the cross-section of a portion of a hand-tool shaft,
• and said hemi-spherical housing having a semicircular opening, at said top of said sleeve, enabling a spherical portion of said ball-shaped end to emerge from said hemi-spherical housing, and said semicircular opening having a diameter, said diameter having opposite ends,
• the angle subtended by an arc of said spherical portion on said ball-shaped end, at the center of ball-shaped end being from 105.degree. to 135.degree.,
• and said semicircular opening of said hemi-spherical housing defining an angle of 105.degree. to 135.degree., as measured from the center of said hemi-spherical housing to the opposite ends of said diameter of said semicircular opening,
• and said two parts of said sleeve being releasably fastened together with bolt means, pulling together said two parts of said sleeve,
• said bolt-means being absent along said semicircular opening of said hemi-spherical housing for said ball-shaped end, and along said hemi-spherical housing for said ball-shaped end adjacent to said semicircular opening,
• said two parts of said sleeve, when assembled, defining:
• a) an inner truncated globular housing for said ball-shaped end,
• said semicircular opening, in each of said hemi-spherical housings for said ball-shaped end, cooperating to define a circular opening,
• in order:
• i) to hold the ball-shaped end, within said inner truncated globular housing, when the tension exerted on the auxiliary shaft is below a given pulling tension, for allowing rotation of said ball-shaped end within said inner truncated globular housing, and for enabling a spherical portion of said ball-shaped end to emerge from said circular opening,
• the angle subtended by an arc of said spherical portion on said ball-shaped end, at the center of said ball-shaped end being from 105.degree. to 135.degree.,
• ii) to allow sliding of said ball-shaped end from said inner truncated globular housing through said circular opening, when said pulling tension exerted on said auxiliary shaft is greater than said given pulling tension, said ball-shaped end exerting a force against said two parts of said sleeve at said circular opening, such as to enlarge said circular opening, and to instantaneously release said auxiliary shaft from said sleeve,
• and b) said inner hemi-housings parallel to said symmetrical axis, acting as a pair of jaws, in order to clamp said portion of a hand-tool shaft.

A three-part, auxiliary, back-saving safety shaft assembly to be mounted along a hand-tool shaft having a tool, and for said shaft assembly to be mounted near said tool, on said hand tool shaft, comprising:

• an auxiliary shaft, and a two-part sleeve,
• said auxiliary shaft having one end and another end,
• said one end of said auxiliary shaft being ball-shaped,
• said ball-shaped end having a diameter, and a center,
• said sleeve having a top, a bottom, and a symmetrical axis running from said top to said bottom,
• and said sleeve being cut in half along said symmetrical axis to define the two parts of said two-part sleeve,
• each part of said two-part sleeve, defining an inner hemi-cylindrical housing parallel to said symmetrical axis of said sleeve, and running from said top to said bottom of said sleeve for tight fitting of half the cross-section of a portion of a hand-tool shaft having a tool, and said portion of a hand-tool shaft being near said tool,
• and each part of said two-part sleeve further defining an inner hemi-spherical housing for receiving half of said ball-shaped end of said auxiliary shaft, said inner hemi-spherical housing having a center,
• said hemi-spherical housing for receiving half of said ball-shaped end of said auxiliary shaft, being adjacent to said top of said sleeve, and spaced from said inner hemi-cylindrical housing for said half the cross-section of a portion of a hand-tool shaft,
• and said hemi-spherical housing having a semicircular opening, at said top of said sleeve, enabling a spherical portion of said ball-shaped end to be displaceable along the outside of said hemi-spherical housing, and said semicircular opening having a diameter, said diameter having opposite ends,
• the angle subtended by an arc of said spherical portion on said ball-shaped end, at the center of said ball-shaped end being from 105.degree. to 135.degree.,
• and said semicircular opening of said hemi-spherical housing, having half of a circular cross-section, said circular cross-section having a diameter, and said diameter defining an angle of 105.degree. to 135.degree., as measured from the center of said hemi-spherical housing to the opposite ends of said diameter of said semicircular opening,
• and said two parts of said sleeve being releasably fastened together with bolt means, pulling together said two parts of said sleeve,
• said bolts means being absent along said semicircular opening of said hemi-spherical housing for said ball-shaped end, and along said hemi-spherical housing for said ball-shaped end adjacent to said semicircular opening,
• said two parts of said sleeve, when assembled, defining:
• a) an inner truncated globular housing for said ball-shaped end,
• said semicircular opening, in each of said hemi-spherical housings for said ball-shaped end, cooperating to define a circular opening, said circular opening having a circular cross-section,
• in order:
• i) to hold the ball-shaped end, within said inner truncated globu;lar housing, when the tension exerted on the auxiliary shaft is below a given pulling tension, for allowing rotation of said ball-shaped end within said inner truncated globular housing, and for enabling a spherical portion of said ball-shaped end to emerge from said circular opening,
• the angle subtended by an arc of said spherical portion on said ball-shaped end, at the center of said ball-shaped end being from 105.degree. to 135.degree.,
• ii) to allow sliding of said ball-shaped end from said inner truncated globular housing through said circular opening, when said pulling tension exerted on said auxiliary shaft is greater than said given pulling tension, said ball-shaped end exerting a force against said two parts of said sleeve at said circular opening, such as to enlarge said circular opening, and to instantaneously release said auxiliary shaft from said sleeve,
• and b) said inner hemi-cylindrical housings parallel to said symmetrical axis, acting as a pair of jaws, in order to clamp said portion of a hand-tool shaft.