Machine element or mechanism – Control lever and linkage systems – Multiple controlling elements for single controlled element
Patent
1986-04-01
1987-10-20
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlling elements for single controlled element
74531, 188 75, 350531, G02B 2126, G05G 1100
Patent
active
047005858
ABSTRACT:
A drive system for slides and x-y stages in microscopes and similar instruments having the possibilities of both fine control and rapid displacement of the slides over larger distances. The drive system comprises a friction wheel and a friction track provided between the slide and the stationary slide guide. A friction wheel together with an actuation knob are solidly fixed on a common shaft and this common shaft is displaceable against a spring force so that the friction wheel is out of contact with the friction track. A brake shoe is provided for each shaft and a clamping element is provided for each brake shoe. The shafts are supported in ball bearings. The brake shoes are closed plastic rings and the clamping elements press uniformly by their U-legs and from diametrically opposite sides against the plastic rings in the braking position, the direction of the force passing through the center axis of the coaxial shafts. Accordingly, the braking forces are applied uniformly from two sides and balance each other, whereby no force component arises which would laterally shift the coaxial shafts.
REFERENCES:
patent: 4189953 (1980-02-01), Volk
patent: 4262991 (1981-04-01), Wagener et al.
patent: 4402576 (1983-09-01), Stahl et al.
patent: 4552033 (1985-11-01), Marzhauser
patent: 4615592 (1986-10-01), Schob et al.
Gebr. Marzhauser Wetzlar oHG
Herrmann Allan D.
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