Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1982-03-02
1984-05-22
Jillions, John M.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254901, B65D 174
Patent
active
044496974
DESCRIPTION:
BRIEF SUMMARY
This invention relates to multiple drum winches.
For many applications a single drum winch is inadequate, and there have been developed several kinds of multiple drum winches which afford greater power, better control, and a kinder lead for the wire. However, the problem is to ensure that the load is properly shared between the drums, which of course have to rotate at related speeds. Generally, the drum around which the first turn is taken is likely to be under the greater load, and will therefore require the greater power.
Hitherto, the practice has often been to drive the capstan drums from a single motor and to use some form of splitter gear or otherwise "strap" the drums together for uniform rotation. However, the unequal loading on the drums means an asymmetrically loaded gear train. An alternative has been to provide separate motors for each drum, but as a result of the different loads there tend to be different speeds of rotation, and usually the drums still have to be strapped together.
The aim of this invention is to avoid the expense and complexity of multiple motors and associated gears, and to drive the drums from a single motor through a simple gear system which fairly distributes the load.
According to the present invention there is provided a multiple drum winch wherein the drive to the drums is through a differential gear train, the rotation of one drum being tied to that of a carrier of an intermediate gear and the rotation of another drum being tied to that of another, non-input gear.
With this differential coupling between the drums, no gear need be rotationally fixed and the gear ratios can be chosen to achieve a suitable balance between the power requirements from the respective drums. The expected co-efficient of friction can be known to within quite narrow limits and be used in determining the gear ratios.
In the preferred form, the drive is to the sun of an epicyclic train, the planet carrier is fixed to said one drum, and the annulus of the epicyclic is geared to the other drum. The epicyclic can be housed within said one drum, or within a fixed mounting for the drums, where there may also be reduction gearing at the input to enable a high speed motor to be used.
Conveniently the drums are carried by bearings located internally at an intermediate load balancing zone, which would be approximately one third of the axial distance of the drum from the end at which the first turn of the cable is taken. Bearings at the ends of the drums would not be necessary.
For a better understanding of the invention one embodiment will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a plan view of a twin capstan winch,
FIG. 2 is a side view of the winch of FIG. 1,
FIG. 3 is a longitudinal section through the two capstans of the winch, and
FIG. 4 is a longitudinal section through another winch.
The general arrangement is shown in FIGS. 1 and 2 where two grooved capstan drums 1 and 2 are mounted on a base 3 and are driven by a hydraulic motor 4. Attached to one end of the base is an upwardly angled bracket 5 below which is pivoted a fairlead assembly 6. This consists of a pulley wheel 7 rotatable between two parallel plates 8 which are fixed to part of a hinge 9 along the sloping underside of the bracket 5. Two arms 10 extend from the axis of the wheel 7 to beyond its radius, where they are joined by a deadeye or bush 11. These arms can swing between two extreme positions, as indicated in FIG. 2, about the axis of the wheel 7, the passage through the deadeye being aligned tangentially with the circumference of the wheel. Thus a wire is guided truely on to the wheel from a wide compass by virtue of the hinge 9 and the swinging arms 10. The wire leaves the wheel 7 and after one turn around the first drum 1 continues around both drums until taken off via further guide pulleys 12, 13 and 14 to a take-up drum 15, by which time it will only be under light tension. The drive to the drum 15 can be coupled differentially via a hydraulic or electric motor to
REFERENCES:
patent: 3376020 (1968-04-01), KLINKE
patent: 3460807 (1969-12-01), Prikhodko et al.
patent: 3788607 (1974-01-01), Crooks
patent: 3834673 (1974-10-01), Alexander
patent: 3843097 (1974-10-01), Noly
patent: 4143855 (1979-03-01), Burton
patent: 4236696 (1980-02-01), Hicks
Hicks Transmissions Limited
Jillions John M.
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