Embroidery hoop with an outer contour deviating from the circular shape
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Jan 29, 1991
filing date -
Jun 14, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The object of the present invention is used to clamp the fabric to be embroidered in mechanical and manual embroidery. In embroidery hoops with an outer contour deviating from the circular shape, the task is to achieve uniform distribution of the contact pressures over the entire clamped surface between the inner hoop and the outer hoop. This task is accomplished by designing the shape of the cross section of the sections of the inner hoop between two axes such that the bending stiffness is essentially constant over the entire circumference of the inner hoop and the extension stiffness decreases continuously between two axes such that it reaches a minimum in the area of the smallest radius of curvature. The cross-sectional shape of the sections of the outer hoop between two axes is designed such that the extension stiffness between two axes changes in the direction opposite the change occurring in the inner frame.
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