Shock absorbing handle of hand impact tool

Details Shock absorbing handle of hand impact tool Shock absorbing handle of hand impact tool

2000-04-03

2001-04-24

Morgan, Eileen P. (Department: 3723)

Tools

Handle for tool

C081S022000

Reexamination Certificate

active

06220128

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a handle of a hand impact tool, e.g., a hammer, and more particularly to a hammer handle that may absorb shock by allowing the whole handle to deform.
2. Description of the Related Art
Hammer have been used for a long time and are still popular. The user's hand is subjected to shock when hammering. U.S. Pat. No. 4,331,193 to Tudisco issued on May 25, 1982 discloses a hammer handle made of a spring strip formed into an oblong closed figure and a synthetic resin handle body molded around the frame. The handle is allowed to flex for reducing the shock resulting from striking a workpiece. Nevertheless, formation of such a hammer handle is troublesome. U.S. Pat. No. 4,738,166 to Yamaguchi issued on Apr. 19, 1988 discloses a hammer having a pair of axially extending passages in a grip thereof to absorb shock by allowing the grip to deform when the hammer head strikes an object. As can be seen from FIGS. 3 and 4 of said patent, the radially extending openings are not communicated with axially extending passages and thus have an unsatisfactory shock absorbing result. U.S. Pat. No. 5,280,739 to Liou issued on Jan. 25, 1994 discloses a hammer with a hand grip having a pair of holes to allow the hand grip to be compressible and deformable such that vibrations and shocks transmitted to the hand grip can be absorbed. Nevertheless, the shock-absorbing effects provided by the hammer handles disclosed in both U.S. Pat. Nos. 4,738,166 and 5,280,739 are not satisfactory, as the shock is only transmitted and absorbed along the axial direction. U.S. Pat. No. 811,390 to Foreman issued on Jan. 30, 1906 discloses a tool handle including channels 5, orifices 7, and recesses 4 in which air entering the recesses 4 may escape via the orifices 7. The shock occurring during hammering is mainly in the vertical direction that is parallel to the longitudinal axis of the hammer head. Nevertheless, the recesses 4 and the channels 5 are too small for they are arranged along a peripheral edge of the tool handle and thus fail to provide satisfactory shock-absorbing effect. The present invention is intended to provide an improved hammer handle that mitigates and/or obviates the above problems.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a handle of a hand impact tool that may absorb shock more effectively by providing at least one axial passage in the handle and at least one transverse slot that is located in an outer periphery of the handle and communicated with the axial passage. The axial passage is located in an upper end portion or a lower end portion of the handle. In addition, the axial passage is substantially semi-circular or crescent shaped in cross section.
In accordance with an aspect of the invention, a handle of a hand impact tool comprises a pair of axial passages defined therein. A row of axially spaced first transverse openings defined in an outer periphery of the handle communicates with one of the axial passages. A row of axially spaced second transverse openings defined in the outer periphery of the handle communicates with the other axial passage. The handle further comprises two rows of axially spaced third transverse openings respectively formed on two sides of the row of axially spaced first transverse openings, each third transverse opening being defined in the outer periphery of the handle and communicated with said one of the axial passages. Two rows of axially spaced fourth transverse openings are respectively formed on two sides of the row of axially spaced second transverse openings, each fourth transverse opening being defined in the outer periphery of the handle and communicated with the other axial passage. The axial passages are substantially semi-circular or crescent shaped in cross section.
By such an arrangement, when hammering an object, the handle deforms not only in the axial direction but also in the radial transverse direction due to the provision of the transverse openings. Thus, shock as a result of hammering may be effectively absorbed not only in the axial direction but also in the radial direction.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 811390 (1906-01-01), Foreman
patent: 3762453 (1973-10-01), Merrow et al.
patent: 4331193 (1982-05-01), Tudisco
patent: 4738166 (1988-04-01), Yamaguchi
patent: 5280739 (1994-01-01), Liou
patent: 5845364 (1998-12-01), Chen
patent: 628656 (1961-10-01), None

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