Tools – Hammer – Having shock absorbing means
Patent
1998-01-28
1999-06-29
Scherbel, David A.
Tools
Hammer
Having shock absorbing means
81 20, B25D 100
Patent
active
059163380
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hammer, comprising a head and an adjoining handle having a grip portion, the head of the hammer being provided with at least one impact surface and a cavity, which is at least partly filled with a particulate material so as to dampen the recoil. The hammer according to the present invention is primarily intended to be used as a workshop hammer.
PRIOR ART
Traditionally, man has learned how to design a hammer in order to fit the intended purpose. The dimensions of the hammer were related to measures of the human body. The length of the hammer was often equal to three times the width of a hand and the weight of the hammer head was equal to the weight of the hand. The advantage with such a design philosophy was that the hammer, which was often manufactured by the user, was also dimensioned to fit the owner or user. Different groups of craftsmen developed their own traditions in this field. Thus, blacksmith hammers and stonemason hammers are different in shape and have been refined through the years. Upon mass production of tools, much of the old skill from many generations disappeared. The individual adjustment became poor. Generally, the aim was to design tools which would fit to many people. Since there is a great difference in bodily measures and strength between men and women, there is an attempt in modern ergonomics to overcome these differences. Today, the object of the designer is to create tools which can be used by as many people as possible without being less efficient or hurting anybody.
U.S. Pat. No. 4,039,012 describes a hammer, the head of which is filled with lead shot in order to absorb a part of the impact wave energy being generated in the hammer head in connection with a stroke. The energy absorption in the head will dampen the recoil, as will be discussed further below.
U.S. Pat. No. 1,304,647 describes a hammer, the handle of which is provided with a counterweight at its free end. The purpose of this counterweight is to statically balance the hammer and thereby reduce the moment of force appearing in the wrist when the user holds the handle of the hammer.
SUMMARY
The object of the present invention is to provide a hammer satisfying, to the largest possible extent, the ergonomical and technological requirements of the user, i.e. that the recoil movement, including the rebound rotation, is controlled so as to correspond to the natural movement of the user's hand and that the vibrations in the handle are reduced. This object is achieved for a hammer having the features stated in the appended patent claims.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
Some embodiments of the hammer according to the present invention will now be described with reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 is a side view of an embodiment of a hammer according to the present invention;
FIG. 2 is a top view of the hammer according to FIG. 1;
FIG. 3 is a rear view of the hammer according to FIG. 1;
FIGS. 4a and 4b schematically illustrate the rebound rotation without and with a counterweight, respectively;
FIGS. 5a and 5b show schematically the rebound rotation without and with recoil damping, respectively;
FIGS. 6a-6c show schematically how the vibrations in the handle are influenced by a counterweight; and
FIG. 7 shows exploded views of different modifications of variou
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"'No bounce' Hammer Has Plastic Tips", Popular Mechanics Magazine (Jan. 1950) p. 165.
Bergkvist H.ang.kan
Bobjer Olle
Lindovist Bo
Danganan Joni B.
Hultafors AB
Scherbel David A.
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