Exercise devices – Striking
Reexamination Certificate
1995-09-25
2001-07-17
Donnelly, Jerome (Department: 3733)
Exercise devices
Striking
C482S087000, C482S090000
Reexamination Certificate
active
06261210
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns striking devices and in particular a karate-and-boxing sack which is intended for the training of various martial arts and fighting techniquess.
BACKGROUND OF THE INVENTION
A boxing sack comprising an outer sack of synthetic material and an inner sack with stuffing is known. The upper part of the inner sack is turned inwards in such a way that a cavity is formed in which a metal hoop is placed. The outer sack is slotted above the hoop and a wire rope passes through the slots, ends in a ring and is fixed to a support.
The disadvantages of the known sacks are as follows:
Limited applicability resulting from the lack of means for lifting and lowering and large deflection of the sack after being hit. Lack of a possibility of using the sack for lower-limb training, large deformations of the sack during hitting and short life due to the friction between the wire rope and the outer sack.
SUMMARY OF THE INVENTION
The purpose of the present invention is the creation of a karate-and-boxing sack characterized by a long life, small deformation, widened applicability, various sizes and shapes, increased weight, rigidness similar to that of the human body, capability for vertical displacement and reliable suspension.
These and other problems are solved in accordance with the present invention by means of a karate-and-boxing sack made of synthetic material in which an inner sack with stuffing is placed.
At its upper end the outer sack is turned inwards in such a way that a cavity is formed in which a metal hood is placed. According to the invention the outer sack is made of a synthetic material on polymer basis having tensile strength values of 2000-7000 N in longitudinal direction and 1500-5500 N in transversal direction.
The stuffing of the inner sack is foreseen to be on the basis of natural and/or synthetic rubber. Elastic duprene elements and rubber elements produced through the recycling of car tires are used in a preferred embodiment.
An additional layer of felt is foreseen between the outer and inner sacks. A cover fixedly connected to the inner surface of the outer sack is placed on the upper side of the inner sack. The outer sack is slotted above the hoop and straps through which a flexible element passes, are mounted to the hoop in the formed slots; the ends of said flexible element pass through a yoke and a roll mounted with displacement at a distance from the axis of the karate-and-boxing sack. At the lower outer side, of the outer sack, a ring is mounted through which another flexible element connected to a support passes.
In another optional embodiment of karate-and-boxing sack the ends of the flexible element are fixed rigidly to supports mounted laterally regarding the axis of the karate-and-boxing sack making an angle a.
In a third optional embodiment of the invention the karate-and-boxing sack is arranged horizontally and the outer sack is closed at both sides. On the upper part of the outer sack rings are mounted through which flexible elements, suspended rigidly to supports, pass.
In a fourth optional embodiment of the invention the two sacks have a pear-shaped form and the outer sack is closed at both sides. On the upper and lower parts of the outer sack rings are foreseen, through which flexible elements pass; the ends of said elements being fixedly connected to supports.
The advantages of the karate-and-boxing sack are as follows:
Long life of the karate-and-boxing sack resulting from the use of a synthetic material for the outer sack with high strength values, resistant to strong hits and multifold bending, the reliable suspension and minimal deflection when hit, the small deformability of the sack because of the stuffing. Possibility of training kicks, stable connection of the flexible element to the hoop with the help of straps which eliminates the friction between the flexible element, the hoop and the outer sack. Possibility of changing the shape and weight of the sack.
REFERENCES:
patent: 2156831 (1939-05-01), Andre
patent: 2203259 (1940-06-01), Gilman
patent: 3384372 (1968-05-01), Dickens
patent: 3421759 (1969-01-01), Chambers
patent: 0516092 (1920-12-01), None
Lishejkov Alexander Marinov
Lishejkova Cveteline Dimitrova
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