NL8800024A - Fitness machine with leaf springs - has constant spring force despite rapid movement with force adjustment by adjusting spring bending point - Google Patents

Abstract

Fhe fitness machine takes the forces on the lever from springs instead of weights. The spring force remains constant during the lever stroke, and the force on the lever does not change by quick movements. The force adjustment to the lever does not require prior movement. The adjustment occurs by adjusting the spring bending point, and the machine does not produce any disturbing noise. The mechanical embodiment also is very light.

Description

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Patent Application No. Laid-Open.

Class

Int.Cl.

Filing date January 7, 1988.

Date of inspection:

Applicant: Cornells Johannes Bierhoff Vrijhoef 42 3833HX LEUSDEN-C

Priority invoked: none.

Short indication: Sports machine with power unit by means of

leaf springs.

The invention relates to equipment for training the body, better known as fitness and sports machines. Fitness and sports machines generally work with weights as a power unit with the disadvantage of long power transmissions, weight changes during fast movements, many pivots and excessive noise production.

The object of the invention is to overcome this drawback. To this end, according to the invention, the sports machine has the feature that the moving mass is very small, the set forces remain constant, has few pivot points and produces no noise.

So-called leaf springs are used instead of weights. These leaf springs cannot simply replace the stated weights. A special mechanism is used for this. This mechanism consists of a profiled disc mounted on a shaft. This profile disc is connected by cable to the springy end of the leaf spring (s). The other side of this leaf spring (s) is fixed motion-free. The profile course of this profile disk and the diameter variation to the shaft bearing, which is created by rotating this disk and simultaneously loading the leaf spring (s), have been chosen such that the force development during the rotation or training stroke is constant. remains.

Put differently; The increasing force on further bending of the leaf spring (s) is completely compensated by a correspondingly smaller lever, the product Force X Arm remains constant.

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An elaborate example will now be described, with reference to the figure in which e.e.a, is schematically illustrated.

The dotted lines indicate the contour of the machine.

30 The lever (8) is the part of the machine to be moved for

the sports training. By shifting the bending point adjuster (6), the force on the lever (8) can be changed within predetermined limits. The profile disc (7) is mounted via the shaft bearing (2) and coupled to the lever 35 (8). The unfixed end of the leaf spring (s) (4) is the flexible tie rod (3) at position (11) connected to the profile disc. The leaf spring (s) (1) is (are) fixed at point (9) with the base (5) of the sports machine (10).

By moving or moving the lever (8), the profile disc (2) rotates, as a result of which the flexible pull rod (3) is moved and the leaf springs (1) will be loaded more or less.

This change in load or force is compensated by a corresponding reduction or increase in the perpendicular distance to the pulling point (4). This reduction and extension 45 are chosen such that the product of the spring force and the imaginary Arm (12) remains constant (Force X Arm = Constant). By moving the inflection point adjuster (6) more towards the draw point, the spring force will be increased, with equal travel of the spring travel, and will be reduced if this inflection point adjuster (6) is moved in the direction of the fixing point (9). The lever (8) is used to train the physical muscles (bundles).

It is clear that a number of changes are possible within the scope of the inventive idea.

A represents the starting (resting) position.

B represents the loaded condition.

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Claims (7)

1. The sports machine derives the forces on the lever from springs instead of weights. 2 The sports machine according to claim 1, characterized in that the spring force remains constant during the lever stroke. 5. The sports machine according to claims 1 and 2, characterized in that the force on the lever does not change due to rapid movements. 4 The sports machine according to claims 1,2 and 3, characterized in that the force adjustment on the lever is quick and easy 10 It is not necessary for them to travel. The adjustment is done by adjusting the spring bending point. 5 The sports machine according to claims 1,2,3 and 4, characterized in that the machine does not produce any annoying noise. 6 The sports machine according to claims 1, 2, 3, 4 and 5, characterized in that the mechanical design is very simple and has a low inherent mass (weight). -3- .8800024