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(11) | EP 0 749 851 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Coupling structure and cloth stretching frame using said coupling structure |
| (57) Members to be coupled (1a-1d) have hollow coupling parts (4) at opposite side surfaces,
a coupling member (2) has, at opposite ends, press-fitting parts (11) which are press-fitted
in the hollow coupling parts, and angle shape concavities and convexities (22) having
crests which are corrupted upon press-fitting are formed on at least either one of
an inner peripheral surface of the hollow coupling part and an outer peripheral surface
of the press-fitting part. When the opposite end parts of the coupling members are
press-fitted in the hollow coupling parts of the members to be coupled, the crests
of concave parts of the angle shape concavities and convexities are corrupted by the
opposed surface so as to be made into close contact with and firmly coupled to the
associated surface. Thereby it is possible to securely couple a pair of members to
be coupled by means of a simple press-fitting operation. |