BAR STRUCTURE FOR THE HORIZONTAL BARS OF A GYMNASTIC APPARATUS
United States Patent 3707286
A gymnastic apparatus having horizontal laminated bars substantially of wood, wherein each bar comprises upper and a lower lamena glued together at an interface therebetween, and wherein longitudinal, cord-like inserts of elastic, synthetic material of inorganic origin are disposed in grooves of the lamenas. The bar is symmetrical along an imaginary vertical center line. The lamenas have at least three inserts. The direction of the fiber of the upper of the lamenas extends substantially vertically. Two of the inserts are disposed in the upper lamena and engage the interface provided between the upper and lower lamenas, and the third of the inserts is disposed in the lower lamena and extends to the lower outer face of the lower lamena.
US Patent References:
/1042808.html
MacManus - October 1912 - 1042808
Composite article
Rugeley et al. - November 1941 - 2262861
Wooden beam
Knight - May 1921 - 1377891
/1042808.html
MacManus - October 1912 - 1042808
Composite article
Rugeley et al. - November 1941 - 2262861
Wooden beam
Knight - May 1921 - 1377891
Inventors:
Spieth, Albert (Oberesslingen, DT)
Spieth, Rudolf (Esslingen-Oberhof, DT)
Spieth, Rudolf (Esslingen-Oberhof, DT)
Application Number:
05/052422
Publication Date:
12/26/1972
Filing Date:
07/06/1970
View Patent Images:
Export Citation:
Primary Class:
Other Classes:
52/832
International Classes:
A63B3/00; A63B3/00
Field of Search:
272/62,63 52/84,309,720,730 161/56,175,176,177 211/123,124
Primary Examiner:
Oechsle, Anton O.
Assistant Examiner:
Stouffer R. T.
Claims:
We claim
1. A gymnastic apparatus having horizontal laminated bars substantially of wood, each of the bars comprising
2. The gymnastic apparatus, as set forth in claim 1, wherein
3. The gymnastic apparatus, as set forth in claim 1, wherein
4. The gymnastic apparatus, as set forth in claim 1, wherein
5. The gymnastic apparatus, as set forth in claim 1, wherein
6. The gymnastic apparatus, as set forth in claim 1, wherein
7. The gymnastic apparatus, as set forth in claim 1, wherein
8. The gymnastic apparatus, as set forth in claim 7, wherein
1. A gymnastic apparatus having horizontal laminated bars substantially of wood, each of the bars comprising
2. The gymnastic apparatus, as set forth in claim 1, wherein
3. The gymnastic apparatus, as set forth in claim 1, wherein
4. The gymnastic apparatus, as set forth in claim 1, wherein
5. The gymnastic apparatus, as set forth in claim 1, wherein
6. The gymnastic apparatus, as set forth in claim 1, wherein
7. The gymnastic apparatus, as set forth in claim 1, wherein
8. The gymnastic apparatus, as set forth in claim 7, wherein
Description:
The present invention relates to a gymnastic apparatus having horizontal bars, in general, and a laminated bar of wood for gymnastic bars consisting substantially of wood, fortified with longitudinal cord-shaped inserts disposed in grooves of lamenas glued together, the inserts being made of an elastic synthetic material, for example with fibers, threads or wires of inorganic origin, in particular.
Bars which are break-safe are known.
It is one object of the present invention to provide a gymnastic apparatus wherein break-safe bars are gripping-fast to an optimum.
It is another object of the present invention to provide a gymnastic apparatus wherein the bar symmetrical along a vertical center line comprises two lamenas of wood and is composed of three inserts, whereby the fiber direction of the upper lamena extends horizontally. Furthermore two of the inserts are disposed in the upper lamena, so that they engage the glue face, while the third insert is flush with the lower outer face of the lower lamena.
Further features of the present invention provide, that the glue face extends within the greatest width of the bar, that the upper inserts have a right angle trapezoid cross-section, that the right angles are adjacent each other, while the profile of the lower insert is oblique-angled, that the height of the upper lamina is smaller than the height of the lower lamena, and that the height of the upper inserts is smaller than the height of the lower insert.
With these and other objects in view, which will become apparent in the following detailed description, the present invention, which is shown by example only, will be clearly understood in connection with the accompanying drawing, in which the only FIGURE is a cross-section of a bar of the gymnastic apparatus designed in accordance with the present invention.
Referring now to the drawing, the bar comprises two lamenas 1 and 2 and is made substantially of wood, fortified with longitudinal, cord-shaped inserts 3, 4 and 5 disposed in grooves of the lamenas which are glued together. The inserts are made of elastic synthetic material for example, a polyester with fibers, or threads or wires of inorganic origin. The bar is symmetric to an imaginary center line 10.
The direction of the fibers of the upper lamina 1 extends vertically. Two of the inserts 3 and 4 are disposed in the upper lamena, such that they engage an interface constituting a glue face 6 between the upper and lower lamenas 1 and 2, while the third insert 5 extends to the lower outer face 9 of the lower lamena 2. The glue face 6 extends within the range of the largest bar width.
The upper inserts 3 and 4 have a right angle trapezoid cross-section, such that the right angles of the upper inserts 3 and 4 are adjacent each other, while the profile of the third insert 5 is oblique-angled. The height of the upper lamena 1 is smaller than the height of the lower lamena 2. The height of the upper inserts 3 and 4 is smaller than the height of the lower insert 5.
The fibers of the lamenas 1 and 2 are arranged such that they are particularly dense at the apex 11, so that the hands of a gymnast exercising gymnastics on the apparatus of the present invention engage the bars, and are thus particularly well secured against lateral sliding. The balls of the thumbs adhere within the range of the apex 11 of the lamena 1.
While we have disclosed on embodiment one the present invention, it is to be understood that this embodiment is given by example only and not in a limiting sense.
Bars which are break-safe are known.
It is one object of the present invention to provide a gymnastic apparatus wherein break-safe bars are gripping-fast to an optimum.
It is another object of the present invention to provide a gymnastic apparatus wherein the bar symmetrical along a vertical center line comprises two lamenas of wood and is composed of three inserts, whereby the fiber direction of the upper lamena extends horizontally. Furthermore two of the inserts are disposed in the upper lamena, so that they engage the glue face, while the third insert is flush with the lower outer face of the lower lamena.
Further features of the present invention provide, that the glue face extends within the greatest width of the bar, that the upper inserts have a right angle trapezoid cross-section, that the right angles are adjacent each other, while the profile of the lower insert is oblique-angled, that the height of the upper lamina is smaller than the height of the lower lamena, and that the height of the upper inserts is smaller than the height of the lower insert.
With these and other objects in view, which will become apparent in the following detailed description, the present invention, which is shown by example only, will be clearly understood in connection with the accompanying drawing, in which the only FIGURE is a cross-section of a bar of the gymnastic apparatus designed in accordance with the present invention.
Referring now to the drawing, the bar comprises two lamenas 1 and 2 and is made substantially of wood, fortified with longitudinal, cord-shaped inserts 3, 4 and 5 disposed in grooves of the lamenas which are glued together. The inserts are made of elastic synthetic material for example, a polyester with fibers, or threads or wires of inorganic origin. The bar is symmetric to an imaginary center line 10.
The direction of the fibers of the upper lamina 1 extends vertically. Two of the inserts 3 and 4 are disposed in the upper lamena, such that they engage an interface constituting a glue face 6 between the upper and lower lamenas 1 and 2, while the third insert 5 extends to the lower outer face 9 of the lower lamena 2. The glue face 6 extends within the range of the largest bar width.
The upper inserts 3 and 4 have a right angle trapezoid cross-section, such that the right angles of the upper inserts 3 and 4 are adjacent each other, while the profile of the third insert 5 is oblique-angled. The height of the upper lamena 1 is smaller than the height of the lower lamena 2. The height of the upper inserts 3 and 4 is smaller than the height of the lower insert 5.
The fibers of the lamenas 1 and 2 are arranged such that they are particularly dense at the apex 11, so that the hands of a gymnast exercising gymnastics on the apparatus of the present invention engage the bars, and are thus particularly well secured against lateral sliding. The balls of the thumbs adhere within the range of the apex 11 of the lamena 1.
While we have disclosed on embodiment one the present invention, it is to be understood that this embodiment is given by example only and not in a limiting sense.