Abstract: A measurement instrument for establishing an angle by which each lens-mounting rim of a spectacles frame having two lens-mounting rims joined by a spectacles bridge is tilted in a horizontal plane in front of an eye of a spectacles wearer comprises a supporting plate onto which a spectacles frame can be positioned with the upper or lower outside edges of the lens-mounting rims downward; a marking line on the surface of the supporting plate for alignment of the spectacles frame; and at least one adjustable means permitting measurement of an angle between an imaginary line connecting a nasal and a temporary edge of a lens-mounting rim and the marking line.

Abstract: A flow regulating apparatus for a fluid, in particular a pneumatic choke valve, includes a housing having an inlet port and an outlet port fluidly connected by a choke channel. A throttling piston is disposed in the choke channel for movement in longitudinal direction between an initial position and an end position. The throttling piston includes a tapered section to define with the choke channel an overflow passage whose cross section is dependent on a position of the throttling piston, wherein the tapered section is configured such that a movement of the throttling piston from the initial position to the end position results in a progressive increase of the cross section of the overflow passage.

Abstract: A pneumatic valve, includes a housing having first and second ports for entry and exit of an operating gas, a main connection line for linking the ports, and a cross bore intersecting the main connection line. A throttle includes a control element which is received in the cross bore and has a control opening with an effective area which progressively decreases from a first end position to a second end position, as the control element moves in a direction toward the second end position, whereby a counterforce is provided to oppose this movement of the control element. Disposed in the main connection line in series with the throttle is a flow orifice, wherein a gas pressure differential upstream and downstream of the flow orifice, as viewed in movement direction of the control element, is utilized to control the effective area of the control opening.

Abstract: A measurement instrument for establishing an angle by which each lens-mounting rim of a spectacles frame having two lens-mounting rims joined by a spectacles bridge is tilted in a horizontal plane in front of an eye of a spectacles wearer comprises a supporting plate onto which a spectacles frame can be positioned with the upper or lower outside edges of the lens-mounting rims downward; a marking line on the surface of the supporting plate for alignment of the spectacles frame; and at least one adjustable means permitting measurement of an angle between an imaginary line connecting a nasal and a temporary edge of a lens-mounting rim and the marking line.

Abstract: A flow regulating apparatus for a fluid, in particular a pneumatic choke valve, includes a housing having an inlet port and an outlet port fluidly connected by a choke channel. A throttling piston is disposed in the choke channel for movement in longitudinal direction between an initial position and an end position. The throttling piston includes a tapered section to define with the choke channel an overflow passage whose cross section is dependent on a position of the throttling piston, wherein the tapered section is configured such that a movement of the throttling piston from the initial position to the end position results in a progressive increase of the cross section of the overflow passage.

Abstract: A pneumatic valve, includes a housing having first and second ports for entry and exit of an operating gas, a main connection line for linking the ports, and a cross bore intersecting the main connection line. A throttle includes a control element which is received in the cross bore and has a control opening with an effective area which progressively decreases from a first end position to a second end position, as the control element moves in a direction toward the second end position, whereby a counterforce is provided to oppose this movement of the control element. Disposed in the main connection line in series with the throttle is a flow orifice, wherein a gas pressure differential upstream and downstream of the flow orifice, as viewed in movement direction of the control element, is utilized to control the effective area of the control opening.

Abstract: The present invention relates to a measuring instrument for establishing the mounting lens angle of a spectacle mount, comprising

Abstract: A hydrostatic bearing assembly highly adaptable to different types of applications, with the actual guiding and bearing functions being associated with guiding rails and separate carrying elements comprising separate bearing elements, the separately produced bearing elements having pressure pockets pressurized by a pressure agent, so as to permit a reduction in production costs and a better adaptation to required conditions of play so as to achieve a higher load bearing capacity.

Abstract: Novel recirculating roller bearings for the longitudinally moveable mounting of an element on a planar bearing surface comprising a bearing body with at least one straight race section, a return section parallel to the said race section, two preferably semicylindrical end deflecting sections connecting the ends of the parallel return section and race section to form a closed circulating track and a plurality of rollers in said circulating track, the improvement comprising retaining elements for successive pairs of rollers engaging circumferential grooves in the race edges.