Abstract:
A seat armrest includes a lower sleeve, an upper sleeve, a driving device, and an adjustable armrest piece. The lower sleeve includes a connecting portion, an inner support portion, and a cover. A stopping device is protruded from the shaft hole towards the axis of the shaft hole. The upper sleeve includes an outer support portion, an opening portion, two slide rails, a partition, and a driven device. The driving device includes a directing frame, a slide plate, a first contact end, and a second contact end. The armrest piece includes a lower slide cover, a slide cover and a press button, which has a release position and a lock position that enables the user to release or lock the driven device and the stopping device, in turn to adjust the height between the inner and outer support portions.
Abstract:
A lifting device for an armrest contains: a first fitting tube, a second fitting tube, and a holder. The first fitting tube includes a connector, a hollow part, a first channel, and a second channel. The first channel has a vertical section and a hollow section, the second channel has an operation area, multiple positioning teeth, multiple limitation areas, plural protrusions, and multiple defining recesses. The second fitting tube is hollow and includes a lateral part and a longitudinal part fitted on an outer wall of the lateral part of the first fitting tube, and the longitudinal part has a projection arranged on an inner wall of the longitudinal part and housed in one of the multiple defining recesses. The holder is mounted on a top of the lateral part of the second fitting tube.
Abstract:
A height adjustment mechanism for a chair armrest contains: an inner tube, an adjusting member, an outer tube, a driving block, a fixing member, and a resilient element. The inner tube includes a base, an accommodating groove, and an elongated hole. The adjusting member includes a guiding slot, two toothed racks, and a plurality of guide teeth, wherein each guide tooth has a first crown portion, a first root portion, and a first bottom face. The outer tube includes a support plate an orifice. The driving block includes a pressing portion, two flanges, and plural positioning teeth, wherein a number of the plural positioning teeth is less than that of the plurality of guide teeth. The fixing member includes a first segment and a second segment. The resilient element is fixed in the inner tube and includes a first end abutting against the driving block and the fixing member.