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US Patent: 5,577,426
Magnetic Bit Holder and Hand Tool Incorporating Same
Patentees:
Daniel M. Eggert (exact or similar names) - Kenosha, WI
Frank Mikic (exact or similar names) - Kenosha, WI

USPTO Classifications:
81/125, 81/439

Tool Categories:
screwdrivers

Assignees:
Snap-On Technologies, Inc. - Crystal Lake, IL

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Jan. 05, 1994
Granted: Nov. 26, 1996

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Stan Schulz
Snap-On Tools Company History
Description:
Emrich & Dithmar - patent attorneys

Abstract

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.

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