Abstract: A reclining apparatus includes a base, a reclining element and a control element. The base is arranged between a seat and a post of a chair. The reclining element is connected to a backrest of the chair and pivotally installed on the base. The reclining element defines a series of apertures. The control element is installed on the base so that the control element is moved on the base while it is rotated on the base. The control element includes a tip for removable insertion into one of the series of apertures defined by the reclining element, thus retaining the backrest on a selected one of several angular positions on the seat.

Abstract: A reclining apparatus is provided between a post and a seat of a chair. The reclining apparatus includes a first joint for attachment to the post, a second joint pivotally connected with the first joint for supporting the seat and a locking device for locking the second joint in one of several reclined positions relative to the casing.

Abstract: A reclining apparatus is disclosed for a chair that includes a backrest and a seat. The reclining apparatus includes a frame and a linkage installed on the frame in order to support the backrest pivotally and the seat movably so that the seat is kept substantially horizontal when the backrest is reclined.

Abstract: A ring-type voltage-controlled oscillator with a good duty cycle for use in a PLL frequency synthesizer. The delay cell circuit used in the ring-type VCO comprises two first inverters, two resistance units, and a differential delay circuit. The inverters receive respective differential input signals and generate respective differential signals to resistance units. The differential delay circuit is coupled to the resistance units, generating differential output signals which are a delayed version of the differential input signals. The resistance units have a resistance value adjusted according to a resistance control voltage for controlling the strength of inverters so as to alter the time delay of the first and second differential output signals.

Abstract: A ring-type voltage-controlled oscillator with a good duty cycle for use in a PLL frequency synthesizer. The delay cell circuit used in the ring-type VCO comprises two first inverters, two resistance units, and a differential delay circuit. The inverters receive respective differential input signals and generate respective differential signals to resistance units. The differential delay circuit is coupled to the resistance units, generating differential output signals which are a delayed version of the differential input signals. The resistance units have a resistance value adjusted according to a resistance control voltage for controlling the strength of inverters so as to alter the time delay of the first and second differential output signals.

Abstract: A control device for use in a chair includes a casing fastened to the chair at the bottom side, a control rod pivoted to the casing, and an operating handle pivoted to the control rod and turnable between an operative position for rotation by the user to bias the control rod to further control rotation/lifting of the chair and a collapsed non-operative position to reduce space occupation of the chair for delivery.

Abstract: A control device for use in a chair is disclosed to include a casing fastened to the chair at the bottom side, a control rod pivoted to the casing, and an operating handle pivoted to the control rod and turnable between an operative position for rotation by the user to bias the control rod to further control rotation/lifting of the chair and a collapsed non-operative position to reduce space occupation of the chair for delivery.

Abstract: A tilt control structure for controlling the tilt angle of the back of a chair is disclosed to include a positioning unit affixed to the back of the chair, a control unit affixed the to seat of the chair and pivoted to the positioning unit, the control unit having an engagement block for engaging the positioning unit to lock the back of the chair, an actuating block coupled to the engagement block through a spring member, and an operating handle turnable between a first position where the spring member is forced by the actuating block to move the engagement block into engagement with the positioning unit and a second position where the spring member is reversed to disengage the engagement from the positioning unit.

Abstract: A reclining apparatus is provided between a post and a seat of a chair. The reclining apparatus includes a first joint for attachment to the post, a second joint pivotally connected with the first joint for supporting the seat and a locking device for locking the second joint in one of several reclined positions relative to the casing.