Muscle trainer and method for the production thereof
Described herein is a muscle trainer including a first and a second curved, elongate spring element, the two spring elements being arranged with their concave sides facing each other, having joint elements at their respective end areas and being connected to each other at their two end areas via joints formed from the joint elements. Also described herein is a method for producing such a muscle trainer.
1. A muscle trainer having a first curved, elongate spring element and a second curved, elongate spring element, wherein the two spring elements are arranged with their concave sides facing each other, each of the spring elements has joint elements at their respective end areas and the spring elements are connected to each other at their two end areas via joints formed from the joint elements in order to form the muscle trainer, wherein the muscle trainer is formed in one piece or consists of the first spring element and the second spring element, and wherein the joint elements of the first spring element are designed as brackets, the brackets being bent in the direction of the concave side of the first spring element and partially enclosing the joint elements of the second spring element, wherein the joint elements of the second spring element are rollers or have a rounded configuration, and a first joint element in form of a bracket in each case forms a bearing in which the respective second joint element of the second spring element is rotatably mounted.
2. The muscle trainer according to claim 1 , wherein the joint elements of the first spring element are designed as snap-action elements, the joint elements of the second spring element are designed as latching elements, and the latching elements are received in the snap-action elements.
3. The muscle trainer according to claim 1 , wherein a respective joint element of the first spring element establishes a form-fit connection with a joint element of the second spring element, wherein the form-fit connection prevents a lateral movement of the first spring element relative to the second spring element.
4. The muscle trainer according to claim 3 , wherein the form-fit connection is provided by in each case at least one projection on the joint elements of the second spring element, said at least one projection engaging in each case in a corresponding opening or in corresponding recesses on the joint elements of the first spring element.
5. The muscle trainer according to claim 3 , wherein the form-fit connection is provided by a change in the wall thickness of the spring elements across their width.
6. The muscle trainer according to claim 5 , wherein the first spring element has, in the area of each of its joint elements, a rib which engages in a corresponding groove in the area of the joint elements of the second spring element.
7. The muscle trainer according to claim 5 , wherein the wall thickness of the first spring element, seen across the width of the first spring element, is greatest at the center and decreases toward the side edges, and the wall thickness of the second spring element, seen across the width of the second spring element, is accordingly at its smallest at the center and increases toward the side edges.
8. The muscle trainer according to claim 1 , wherein the first spring element and the second spring element are both free of undercuts.
9. The muscle trainer according to claim 1 , wherein the two spring elements of the one-piece muscle trainer are connected to each other by resilient arcs arranged on each of the convex sides.
10. The muscle trainer according to claim 1 , wherein the two spring elements are produced from a thermoplastic.
11. The muscle trainer according to claim 10 , wherein the thermoplastic is chosen from polyoxymethylene (POM), polybutylene terephthalate (PBT), polyamide (PA), acrylonitrile-butadiene-styrene (ABS) and polypropylene (PP).
12. A method for producing a muscle trainer according to claim 1 , comprising the steps of
a) producing the first spring element and the second spring element by injection molding using at least one injection mold,
b) bending the first spring element by applying force to the two end areas of the first spring element and/or curving the second spring element by applying force to the two end areas of the second spring element,
c) inserting the second spring element into the first spring element,
d) terminating the force application onto the first spring element and/or onto the second spring element, wherein the joint elements of the first spring element and of the second spring element form joints.
13. A method training hand muscles comprising actuating a muscle trainer according to claim 1 .