Magnetic bit holder and hand tool incorporating same

a technology of magnets and tools, applied in the field of hand tools, can solve the problems of inability to press fit or crimp neodymium magnets, and achieve the effect of enhancing structural and operating advantages

Inactive Publication Date: 2000-08-01
SNAP ON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It is a general object of the invention to provide an improved magnetic bit holder which avoids the

Problems solved by technology

However, neodymium magnets are extremely brittle and cannot be press fit or crimped, nor can they be im

Method used

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  • Magnetic bit holder and hand tool incorporating same
  • Magnetic bit holder and hand tool incorporating same
  • Magnetic bit holder and hand tool incorporating same

Examples

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Embodiment Construction

Referring to FIG. 1, there is illustrated a hand tool 10 having an elongated shank 11, provided at one end thereof with an enlarged handle 12 and provided at the other end thereof with a substantially cylindrical bit holder 20. The shank 11 and the bit holder 20 are preferably of unitary, one-piece construction, being formed of a suitable metal, while the handle 12 may be formed of any desirable material, such as wood, plastic or the like. The handle 12 may have an axial bore to receive the adjacent end of the shank 11 or, alternately, may be formed around the handle end of the shank 11, as by a suitable molding process, all in a known manner.

Referring also to FIG. 2, the bit holder 20 includes a circularly cylindrical body 21 having a distal end surface 22 in which is formed an axial bore 23, which has a transverse cross-sectional shape which is non-circular, such as polygonal. Preferably, the bore 23 is hexagonal in transverse cross section. The bore 23 terminates at an inner end ...

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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.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to hand tools and, in particular, to tools incorporating a bit holder for receiving interchangeable bits, such as screwdriver bits or the like. The invention has particular application to tools in which bits are magnetically retained in a bit holder.2. Description of the Prior ArtTypical current magnetic bit holders include a cylindrical body having a socket formed axially in one end thereof for mateably receiving an associated bit. The inner end surface of the socket has further formed therein an axial hole of reduced cross section receiving an associated magnet to retain the bit in place in the socket. A suitable permanent magnet is press-fitted or crimped into the magnet hole for magnetically retaining the associated bit in place. The magnet is commonly formed of a material such as Alnico and has considerable mass, typically being approximately one inch long and approximately one-quarter inch in dia...

Claims

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Application Information

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IPC IPC(8): B25B23/02B25B23/12B25B15/02B25B23/00
CPCB25B15/02B25B23/12
Inventor EGGERT, DANIEL M.MIKIC, FRANK
Owner SNAP ON INC
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