Cutlery – Cutting tools – Plural cooperating blades
Reexamination Certificate
2000-02-29
2001-04-24
Watts, Douglas D. (Department: 3724)
Cutlery
Cutting tools
Plural cooperating blades
C081S427500
Reexamination Certificate
active
06219924
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an air bag buffer device for a hand tool comprising a hollow bag having a snake-like tube and a plug, which is especially suitable for being used in gardening clippers or clippers. An air bag buffer device is installed at the inner side of the handle of a hand tool for absorbing the impact force from closing two handles and the react shock as the hand tool applied a force can also be absorbed. By elasticity, the handles can restore to the original state rapidly for being operated again.
BACKGROUND OF THE INVENTION
Conventional hand tools, such as gardening tools or clippers, can be classified into two types, one with long handles and the other with short handles. For example, for a gardening clippers, no matter having long handles or short handles, as the handles clamp a branch to be cut, a resisting force will generate so that the user must apply a larger force for cutting the branch. While at the moment that the branch is cut, the handles will close instantly due to the resisting force disappears, and thus the handles will collide with one another. For a long period of time, not only the gardening clippers are possible destroyed, moreover, as the user works for a long time, due to the react shocks from branches, the user will feel ache at the waists and hands.
Therefore, in general, shock-proof blocks are installed at the inner sides of the handles of the gardening clippers for reducing the impact force between the two handles. However, in general, the shock-proof is made of solid plastic and rubber with a small deformation as it is compressed. Namely, the margin for elastic deformation is very smaller. Therefore, they can not effectively absorb reacting shock or vibration. Thus, the defect in the prior art can not be solved completely.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide an air bag buffer device for a hand tool comprising a hollow bag having a snake-like tube and a plug. Therefore, by compressing air, a damping effect is formed. Thereby, the buffer device can be installed at the inner side of a handle for absorbing the impact force from closing two handles and the react shock as the hand tool applied a force can also be absorbed. Therefore, the users will not be hurt due to a long period of using the hand tool.
Another object of the present invention is to provide an air bag buffer device of a hand tool, as two handles of a hand tool are closed, by elasticity of the air bag buffer device, two handles can be separated for being used again.
A further object of the present invention is to provide an air bag buffer device for a hand tool, wherein at least one air groove is installed at an outer wall of the air bag buffer device, thereby, the air bag buffer device can be assembled to the handles. By the air groove, air can flow into the buffer device so that as the buffer device is compressed, a damping force is generated and thus the impact force is reduced.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
REFERENCES:
patent: 2727304 (1955-12-01), Kulbersh
patent: 2979862 (1961-04-01), Tacderan
patent: 4078307 (1978-03-01), Zavala
patent: 5592743 (1997-01-01), Labarre et al.
Varndell & Varndell PLLC
Watts Douglas D.
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