Resistance device for a gymnastics apparatus
OwnerKarl-Erik Berkestad, Lars Goran Torgny Borjessoninventors
Life of this patent
Estimating the term…
Abstract
Resistance device for a gymnastics apparatus, comprising an air cylinder and a piston which is movable inside the cylinder. The device is provided with non-return valves in such a manner that, during repeated relative movement of the piston in the cylinder, the air pressure in the device and, thereby, resistance to movement of the piston increases successively.
Claims9
A gymnastics apparatus having a resistive device, said device comprising first and second end parts which are reciprocally movable towards and away from each other, said first end part having a first end forming an air cylinder and said second end part comprising a first end forming a piston which is movable inside said air cylinder, and a second end forming a piston rod connected to said first end, characterized in that the device is provided with a first non-return valve arranged between said piston and said cylinder and a second non-return valve arranged between said cylinder and said piston rod such that, during repeated relative movement between said first and second end parts, the air pressure in the device, and therewith, the resistance to said relative movement increases successively, and an evacuation valve provided in said first end part and in communication with said cylinder and being manually operable to reduce the air pressure in said cylinder.
A gymnastics apparatus having a resistive device, said device comprising first and second end parts which are reciprocally movable towards and away from each other, said first end part having a first end forming an air cylinder and said second end part comprising a first end forming a piston which is movable inside said air cylinder, and a second end part forming a piston rod connected to said first end, characterized in that the device is provided with a first non-return valve arranged between said piston and said cylinder and the cylindrical chamber on the side of the piston removed from the piston rod is in communicating connection with a separate accumulating chamber via a second non-return valve which opens into said accumulating chamber and that a portion of the cylindrical chamber on the piston rod side communicates freely with the atmosphere.
Dependencies are inferred from the claim text.