Patent GB-901714-A (GB)
Title: Improvements in or relating to gas purification apparatus
Inventor: INGHAM CLEMENT
IPC: C10K1/22
Filed: 1957-11-08
Abstract: 901,714. Lifting apparatus for gas purification tenders. HOLMES & CO. Ltd., W. C. Nov. 10, 1958 [Nov. 8, 1957], No. 34820/57. Drawings to Specification. Class 55 (2). Lifting apparatus for gas purifying material containers is provided with (1) a lifting member, carried by a frame adapted to be suspended on a crane lifting chain, engageable with projections within and secured to a central portion of an oxide container and displaceable so as to be clear of the projections, and (2) a mechanism for displacing the lifting member clear of the projections on each alternate lifting operation, the frame also having a series of spaced-apart retractable hooks adapted to engage with eyes secured to the peripheral wall of the container. There may be additionally provided a member adapted for attachment to a crane-lifting chain which is vertically slidable relatively to a frame and ratchet mechanism interposed between the member and the frame, the latter being operatively connected to the lifting member for displacing the latter in step-by-step fashion during each lifting operation. The lifting member preferably comprises a series of radial projections on a vertical spindle which is rotatably mounted in the frame, the ratchet mechanism being operative to impart a partial rotation to the spindle during the initial part of each lifting operation. The ratchet mechanism may comprise a pawl pivotally mounted on the frame in the path of a ratchet wheel rotatably mounted on a vertically slidable assembly incorporating the member adapted for attachment to a crane-lifting chain, the ratchet wheel being connected by gearing and a spline connection to the vertical spindle, the arrangement being such that at the end of a lowering operation the assembly will descend relatively to the frame and the ratchet wheel will trip over the pawl, and on the commencement of a lifting operation the assembly will rise relatively to the frame and the ratchet wheel will be given a partial rotation by engagement with the pawl. The spindle preferably extends through a cruciform hole in a plate incorporated in the vertically slidable assembly, the spindle having radial projections over which the cruciform hole will pass when the projections are aligned with the cruciform hole, the arrangement being that on alternate lifting operations the projections will be aligned with the cruciform hole so as to permit the plate to rise above the projections up to a stop on the frame, and on intermediate lifting operations the spindle will be disposed so that the projections are out of alignment with the cruciform hole and consequently will arrest the rising movement of the plate and the vertically slidable assembly in which the plate is incorporated. The plate may be connected by lever and link mechanism to the retractable hooks whereby the hooks will be either in retracted positions or in operative engaging positions according to whether the plate has been arrested by the projections on the spindle or has risen above the projections and up to the stop.