초록 ▼

A hand tool has an elongated shank with a handle at one end and a bit holder at the other end, the bit holder including a cylindrical body having a distal end surface and an axis, the body having an axial bore formed in the end surface of non-circular transverse cross section and terminating at an i

A hand tool has an elongated shank with a handle at one end and a bit holder at the other end, the bit holder including a cylindrical body having a distal end surface and an axis, the body having an axial bore formed in the end surface of non-circular transverse cross section and terminating at an inner end surface. A neodymium permanent magnet is freely received in the bore and retained against the inner end surface by a thin circular retainer, formed of metal or plastic, which is interference-fitted in the bore. Both flat, disk-like and concave, bowl-shaped retainers are disclosed. A shock-absorbing cushion may be disposed between the magnet and the inner end surface of the bore. A bit formed of magnetizable material is mateably received in a socket portion of the bore and retained in place by the magnet. The portion of the bore receiving the magnet may have a different cross section from the socket portion. The magnet may be disposed in an encapsulation which interference fits in the bore.

대표청구항 ▼

[ We claim:] [17.] A bit holder comprising:a body having a distal end surface,said body having a bore formed in said end surface,a magnet received in said bore and having an outer surface,and a discrete flat retaining member friction fitted in said bore outboard of said magnet and substantially cove

[ We claim:] [17.] A bit holder comprising:a body having a distal end surface,said body having a bore formed in said end surface,a magnet received in said bore and having an outer surface,and a discrete flat retaining member friction fitted in said bore outboard of said magnet and substantially covering said outer surface of said magnet to retain said magnet in said bore,said bore having a portion outboard of said retaining member defining a bit-receiving socket..Iaddend..Iadd.18. The bit holder of claim 17, wherein said magnet is a permanent magnet..Iaddend..Iadd.19. The bit holder of claim 17, wherein the portion of said bore outboard of said retaining member is non-circular in transverse cross section..Iaddend..Iadd.20. The bit holder of claim 17, wherein said retaining member is imperforate..Iaddend..Iadd.21. The bit holder of claim 17, wherein said body has an axis of rotation extending through said end surface, said bore being formed axially in said end face..Iaddend..Iadd.2. The bit holder of claim 17, wherein said bore terminates at an inner end surface, said retaining member cooperating with said inner end surface to retain said magnet therebetween..Iaddend..Iadd.23. The bit holder of claim 17, wherein said aining member is a substantially circular disk..Iaddend..Iadd.24. A bit holder comprising:a body having a distal end surface,said body having a bore formed in said end surface,a magnet received in said bore and having an outer surface,and a discrete flat retaining member friction fitted in said bore outboard of said magnet to retain said magnet in said bore,said retaining member having a continuous outer periphery such that any two points on the periphery can be joined by a straight line segment which does not extend outside the periphery,said bore having a portion outboard of said retaining member defining a bit-receiving socket..Iaddend.