Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1995-03-24
1997-01-21
Bonck, Rodney H.
Machine element or mechanism
Control lever and linkage systems
Elements
280655, 280 47315, 403109, 16115, B62B 112, G05G 522
Patent
active
055950922
ABSTRACT:
A positioning device of a pair of telescopically retractable vertical bars of a trolley includes a sleeve member, a pair of eccentric rings and a control unit. The sleeve member has a pair of sleeves coaxially rigidly mounted on outer tubes of the vertical bars, a plate having a height no less than a height of the sleeves and horizontally extending between the sleeves and tangentially in contact with them at an outer periphery thereof, and a gap respectively and radially defined in the sleeves. The eccentric rings have an inner diameter equal to an outer diameter of inner tubes of the vertical bars for the inner tubes passing therethrough and are coaxially rivetally retained in the gaps with a thinner ring wall thereof in contact with the plate. The control unit is adapted to actuate the eccentric rings to rotate and cause a thicker ring wall thereof to contact the plate and thereby radially displacing the eccentric rings to tighten the inner tubes of the vertical bars to the sleeves and thereby positioning the vertical bars.
REFERENCES:
patent: 4076437 (1978-02-01), Mazzolla
patent: 4995487 (1991-02-01), Plath
patent: 5335759 (1994-08-01), Yeh
Battista Mary Ann
Bonck Rodney H.
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