Tools – Hammer – Having shock absorbing means
Reexamination Certificate
2000-08-22
2002-04-02
Hail, III, Joseph J. (Department: 3723)
Tools
Hammer
Having shock absorbing means
C081S019000
Reexamination Certificate
active
06363817
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to hand tools, and in particular, to a shock absorption system for a striking tool having a head connected to a shaft.
BACKGROUND OF THE INVENTION
Conventional striking tool, such as hammers, axes, sledgehammers, picks, etc., generally include a head portion mounted to one end of a shaft. Typically, the head portion is rigidly mounted to the shaft so that the force exerted on the striking tool by the user is efficiently transmitted through the shaft to the head of the tool. By rigidly attaching the head to the shaft, the force is transmitted through the shaft and to the head so that the contact surface of the head strikes an object with full force. Additionally, the head is typically rigidly attached to the shaft in order to ensure that the head remains fixed to the shaft after repeated striking of the tool on various hard objects.
While rigid attachment of the head of a striking tool to the shaft provides for an efficient transfer of energy to the object being struck by the tool, the rigid attachment produces a tool with several distinct disadvantages. One undesirable result of rigidly mounting the head to the shaft is that any vibration produced when the head strikes an object travels through the head and down the shaft to the hand of a user of the tool. Additionally, any reverberation of the vibration within the head also travels through the shaft to the hand of the user. Such vibrations in the shaft can cause great discomfort to the user and can be detrimental not only to the health of professionals who use striking tools repeatedly for extended periods of time, but also to non-professionals who occasionally uses striking tools for small jobs.
Consequently, a need exists for a striking tool that is constructed to reduce the amount of vibration that travels from the head to the shaft of the striking tool. Such a striking tool should be uniquely constructed to include a vibration dampening device that is positioned within the joint between the head and the shaft. Furthermore, there is a need for a striking tool that dampens the reverberation of vibration within the head of the striking tool, thereby further reducing the amount of vibration that travels from the head to the shaft of the striking tool.
SUMMARY OF THE INVENTION
The present invention provides a shock absorption system for a striking tool that reduces the amount of vibration travelling from a head of a striking tool to a shaft. The present invention achieves this result by providing vibration dampening members between the head and the shaft, and within a cavity in the head.
The present invention advantageously provides a shock absorption system that includes a resilient member positioned between a portion of the head and a portion of the shaft of the tool. The resilient member dampens and absorbs vibration travelling from the head to the shaft and reverberations travelling through the tool. The exemplary embodiment of the shock absorption system further includes a shock-absorbing member having an internal portion positioned within a cavity in the head of the tool and an external portion positioned on an upper surface of the head. The resilient member dampens and absorbs vibration travelling within the head and reverberations travelling through the tool. The exemplary embodiment of the shock absorption system also includes a bonding material filling spaces with the cavity and a channel within the head. The bonding material further dampens and absorbs vibration travelling from the head to the shaft and reverberations travelling through the tool. The exemplary embodiment further includes a handle portion on the shaft that has a soft elastomeric outer coating that provides a comfortable grip to the user and hinders vibration from travelling from the shaft to the hand of the user. The shock absorption system of the present invention advantageously reduces vibrations in the shaft that can cause great discomfort to the user and can be detrimental to the health of the user.
Additional advantages and other features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from the practice of the invention. The advantages of the invention may be realized and obtained as particularly pointed out in the appended claims.
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European Search Report EP 00 30 3581.
Claypool Christopher
Correa Jose L.
French David L.
Heinzelman Bert D.
Lamond Donald R.
General Housewares Corporation
Hail III Joseph J.
McDermott & Will & Emery
Ojini Anthony
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