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US 4,022,429 AGranted
Lifting apparatus
AssigneeDaido Kiko Co., Ltd.
InventorSukio Yonekura
Life of this patent
Estimating the term…
Abstract
A lifting apparatus wherein a cone rack mechanism having cone pieces interlocked to driving gears is driven by such driving gears, which are connected and controlled by a special friction clutch mechanism, a latch mechanism, and a centrifugal brake, for continuing the lifting and lowering of a body, such as a water gate.
Claims6
A lifting appartus which comprises:
- a cone rack mechanism having a cone stem means and a series of cone pieces fitted on said cone stem means;
- first and second driving shafts disposed in parallel relation with one another in a casing, each driving shaft having a driving gear interlocked to the cone pieces of the cone rack mechanism;
- and
- an operating handle, axially slidable on a third driving shaft operatively connected to said first and second driving shafts and including first and second threaded shaft portion means, and a non-threaded portion interposed between said threaded portions, for alternatively engaging said threaded portion means so as to operatively drive said driving shafts in alternate directions whereby said shafts will similarly rotate said gears so as to alternatively move said cone stem means in opposite directions as desired for the performance of a driven ascending or descending operation of said lifting apparatus, and for engaging said non-threaded portion so as to drivingly disengage said third driving shaft from said first and second driving shafts whereby said cone stem means and said lifting apparatus descend under its own weight.
1 more element
A lifting apparatus for operating a rack stem having connected at its bottom end a water gate body which is lifted and lowered by movement of a driving gear interlocked to the rack stem, which comprises:
- a centrifugal brake connected through a speed promoting device to a driving shaft carrying said driving gear;
- a friction disk stopper fixed on said driving shaft;
- a ratchet wheel rotatably mounted on said driving shaft and being connectable to said friction disk stopper at its side surface;
- a pawl member for preventing reverse rotation, fixed to the casing and interlocked to the ratchet wheel;
- said driving shaft having a threaded portion means for facilitating ascending motion of said lifting apparatus, a threaded portion means for facilitating descent of said apparatus and having an identical turn with said threaded portion for providing ascent and a non-threaded portion disposed between said identically threaded portions;
- and
- an operating handle having a threaded portion which can be engaged with the identically threaded portions and the length of which is smaller than that of the non-threaded portion.
4 more elements
Dependencies are inferred from the claim text.