Abstract: A window blind, with a winding shaft having a rolling-up device, a blind web rolled up on the winding shaft, a pull bar, to which the free end of the blind web is fastened, a guide arrangement, on which the end regions of the pull bar are arranged longitudinally displaceably perpendicularly to the pull bar axis, and a braking arrangement which is arranged inside the pull bar and acts releasably on the guide arrangement in order to fix the pull bar in any positions on the guide arrangement.

Abstract: A vertical shade assembly extendable and retractable in a horizontal direction and including a pleated shade member suspended from an upper traversing track, a shade guide mechanism extending through the assembly, and a braking mechanism operatively connected to the shade guide mechanism for creating a braking force to hold the shade member against movement.

Abstract: An air-fuel ratio controlling system for an internal combustion engine including a control circuit for controlling, in accordance with a detected air-fuel ratio, the operation of a drive motor of a control valve mounted in an additional air supply passage. The control circuit includes a timing pulse generator for generating timing pulses synchronized with a running speed of the engine and thus the control valve is intermittently rotated by a predetermined amount in response to the timing pulses. By increasing the frequency of the timing pulses during the periods of rapid acceleration and deceleration, a response to the change in the engine speed is further improved.