Exercise devices – User manipulated force resisting apparatus – component... – Utilizing fluid resistance
Patent
1992-09-21
1993-10-05
Bahr, Robert
Exercise devices
User manipulated force resisting apparatus, component...
Utilizing fluid resistance
482111, A63B 21008
Patent
active
052500152
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to improvements in and relating to exercising apparatus of the type adapted to be used by humans to exercise muscles and other body parts.
BACKGROUND ART
Many different types of exercising apparatus can be purchased by persons anxious to improve their health and physical abilities. The simplest would be spring-extension stretching devices to be used manually, but other types, too numerous to enumerate, either occupy an unduly large space in storage or use, or they lack portability. A further disadvantage is that most have strong spring-recoil mechanisms which can lead to body strain or to accidents of one kind or another. Lack of fine adjustability to suit different users or various operating conditions and requirements can also be a disadvantage with most current types of exercising apparatus.
The present invention has been devised with the aforementioned current deficiencies and disadvantages in mind, and it has for its principal object the provision of improved exercising apparatus having novel features whereby it will be safer and more effective than known types in relation to portability and adjustability in particular. The invention also aims to provide such novel forms of exercising apparatus which will use non-recoil principles and which can be adapted to use in different applications so that any desired muscle can be exercised, while infinitely variable resistance can be utilised as required. Other objects and advantages of the invention will be hereinafter apparent.
DISCLOSURE OF THE INVENTION
With the foregoing and other objects in view, the invention resides broadly in exercising apparatus including:
an elongate frame;
a longitudinal hydraulic main cylinder housed in or forming part of said frame, one end of said main cylinder being fixedly mounted relative to a mounting end of said frame;
sealing means at the other end of said main cylinder through which a plunger rod is sealably slidable axially of said main cylinder;
handle means associated with that end of said plunger rod which is external of said main cylinder;
a main piston at the end of said plunger rod within said main cylinder and mounted in sealably slidable manner to define two opposite sides of said main cylinder;
adjustable aperture means interconnecting said two sides of said main cylinder for adjustably varying the permitted flow of hydraulic liquid from one to the other of said opposite sides upon movement of said plunger rod and said main piston;
a displacement cylinder mounted on said frame and having one of its ends in liquid communication with said main cylinder at one of said two opposite sides thereof, and
a closure piston mounted in sealably slidable manner in the other end of said displacement cylinder and movable in response to movement of said main piston and said plunger rod to maintain a liquid-filled condition of said main cylinder regardless of the positions occupied by said main piston and said plunger rod.
Many different types of design features may be selected within the broad idea as aforementioned. For example, the displacement cylinder is preferably in spaced parallel relationship to the main hydraulic cylinder and suitably of smaller diameter, but if desired the displacement cylinder could be around and coaxial with the main cylinder.
Preferably the adjustable aperture means is provided in and extending through said main piston between the two opposite-sides of said main cylinder, there being provided adjustment-control means for said adjustable aperture means leading operatively from said main piston to said handle means. Preferably, said main piston includes a fixed piston member secured rigidly to said plunger rod, and an adjustable piston member adjustably rotatable about the axis of said main piston and said plunger rod relative to said fixed piston member, there being apertures through both said piston members adapted to be brought into selected degrees of register to vary the permitted flow according to the rotational disposition of said adjustable piston
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patent: 4880230 (1989-11-01), Cook
Bahr Robert
Reichard Lynne A.
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