Spring devices – Miscellaneous
Patent
1985-05-31
1986-12-09
Butler, Douglas C.
Spring devices
Miscellaneous
248161, 2481882, 248405, 2484061, 254 98, 297345, F16F 100, A47C 324
Patent
active
046276025
ABSTRACT:
A mechanical lifting device, preferably for a chair seat, comprising two reciprocally telescoping parts, one of which is attached to a chair support, whereas the other part is attached to the chair seat, both parts being mutually spring loaded, a locking screw being pivoted to the first part inside one of its ends and revolving about the longitudinal axis of the part, that the second part comprises an outer locking tube coaxially surrounding a hollow pressure rod and a number of locking nuts, e.g. three, intended for engagement with the locking screw and provided inside the locking tube, the locking nuts being mutually spring loaded and when the pressure rod is actuated enabling the locking screw to turn relative to the locking nuts when they move in the longitudinal direction of the lifting device, thereby the mutual position of the two parts is also changed. When actuation of the pressure rod stops a locking engagement is achieved between locking nuts and locking screw by the aid of the mutual spring load. The locking screw may be manufactured from a twisted polygonal, e.g. square, rod. The outer locking tube may e.g. have a hexagonal cross section, the locking nuts having an outer circumference corresponding to the inner cross section of the locking tube and central holes corresponding to the cross section of the locking screw. The pivotal mounting of locking screw is preferably supported by a resilient member. Furthermore, a shock absorbing function is obtained for the lifting device the locking screw being provided with a gasket sealing against the inside of the pressure rod.
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patent: 4245826 (1981-01-01), Wirges
patent: 4279398 (1981-07-01), Pregnall
patent: 4285488 (1981-08-01), Hancock
Butler Douglas C.
Hag A/S
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