| 摘要 |
<p>An adjustable joint for connecting three parts of an assembly, such as a seat part, a backrest part, and a leg part of a foldable piece of furniture, includes three joint members connected to the three parts of the assembly, respectively. Two of the joint members are mounted on the remaining joint member for pivoting movement with respect thereto about two spaced parallel axes between their respective folded and extended positions. One of the two joint members is provided with a serrated detent position, and the other of the two joint members has associated therewith an arresting portion which engages the detent portion as the other joint member is pivoted toward its extended position. The remaining joint member also has an abutment portion which cooperates with the other joint member to prevent its movement beyond the extended position. When the arresting portion is out of engagement with the detent portion, the position of the one joint member with respect to the remaining joint portion may be adjusted, and the one joint member may be arrested in such an adjusted position by pivoting the other joint member toward its extended position. The forces acting on the assembly tend to displace the other joint member toward its extended position so that the arresting action of the arresting portion is proportional to such forces, whereby accidental displacement of the one joint member out of its selected position during the use of the assembly is prevented.</p> |
