| 摘要 |
1,150,044. Brackets. INSTRUMENTATION LABORATORY Inc. 14 Sept., 1967 [31 Oct., 1966], No. 41893/67. Heading A4B. A counterbalanced support includes first and second pairs of parallel arms 20A, 20B and 20C, 20D pivoted to a coupling element 24 about parallel axes 30A<SP>11</SP>, 30B<SP>11</SP> and 30C<SP>11</SP>, 30D<SP>11</SP>, the first pair 20A, 20B being pivoted at 30A<SP>1</SP>, 30B<SP>1</SP> to a base coupling 22 rotatably mounted on a vertical stub shaft 28 in a base 14 screwed clamped to a support and the second pair 20C, 20D pivotally supporting at 30C<SP>1</SP>, 30D<SP>1</SP> an article holder 12, and pairs of equipoising springs 32, 36 interconnecting the coupling element 24 with the base coupling 22 and the holder 12. Each arm 20A-D has rolled ends (40) which tightly receive a pin 60 with laterally projecting stubs journalled in apertures 54 in ears 50 of the coupling element 24. Slots 56, 58 extending radially from the aperture 54 effect a bifurcation of the ear 50 so that the pin stubs are gripped in the aperture 54 by the resilient bifurcations and are rotatable against the holding friction induced by the gripping. |
