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
1984-08-23
1986-06-17
Levy, Stuart S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254354, 254371, B66D 114, B66D 130
Patent
active
045951730
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a capstan winch, particularly for sailing boats, which comprises a stationary shaft element to be mounted projecting from a mounting surface such as a boat deck and a winch drum, which is mounted on the shaft element and is rotatable by means of an outer crank handle. In use the rope to be hauled in is wound a few turns about the winch drum, whereafter the operator can haul in the rope by rotating the drum, when the rope end as running off the drum is maintained taut. Thus, it is required to simultaneously turn the crank handle and maintained the off-running rope taut, which is a matter of inconveniently making use of both hands.
Therefore, so-called self tailing winches have been developed, in which one end of the drum, normally the outer end, is provided with a disc, which, together with the associated, widened end surface of the drum, confines an annular, narrow groove, which may receive and frictionally engage a single rope turn, with the groove preferably having a wedge shaped cross section and a bottom area of a diameter substantially equal to the diameter of the active cylindrical portion of the winch drum.
The rope end as running off from the drum is laid tightly into the annular groove, whereby the tightness of the rope will be maintained during the further rotation of the drum inasfar as the groove walls as holding the rope will rotate together with the drum. Hereby, however, the rope winding as held in the groove will tend to run back into itself, and, in practice, it is necessary, therefore, to arrange for a stationary member to be located in the groove for successively guiding the rope from the groove. Correspondingly, the rope may be present in the groove only along half or three quarters of its peripheral length, but the associated frictional engagement will be sufficient to achieve the desired tightening of the rope as running off the drum during the continued rotation thereof.
Constructionally the provision of such a stationary outlet member inside the groove of the rotary assembly is rather inconvenient. For obvious reasons the outlet member must be arranged so as to project into the groove from the outside, and since the winch drum should preferably be freely accessible all the way round it is natural to provide the outlet member on a radial arm as projecting outwardly from an outer end of the stationary shaft element. Thus, the stationary shaft element should project beyond the outer end of the rotary drum element with associated tightening groove. This involves that the rotary element cannot be rotated just by a simple axial engagement with a crank handle, because the handle should by necessity be engaged centrally, when a rotation about a stationary part having a fixed radial arm is to be produced. Thus, a driving connection is established between a central drive shaft as rotated by the crank handle and an interior area of the rotary drum element, through or across a stationary part surrounding the drive shaft and carrying the said outer radial arm.
This problem has given rise to many considerations as to a practical solution of the problem. It stands as a natural condition that the drum and the associated tightening groove should be rotated by the crank handle in the same direct synchronous manner as with the winches of the first mentioned simple type, and on this background some complicated solutions have been developed, such as, for example, in GB-A-2,034,661, wherein the winch drum is rotated by special pawl mechanisms, which are mounted on the inside of the drum so as to cooperate with one side of an exterior toothing on the crank driven shaft as arranged eccentrically with respect to the drum, with the pawl mechanisms being held inoperative adjacent the opposite side of said toothing, whereby at this place there is provided space for a stationary element to project through the driving engagement area for carrying at its outer end the fixed radial arm as holding the outlet member in the tightening groove. The problem is in fact hereby overcome, bu
REFERENCES:
patent: 1177767 (1916-04-01), Eggleston
patent: 2408365 (1946-10-01), Biehl et al.
patent: 3985340 (1976-10-01), Guangorena
patent: 4143855 (1979-03-01), Burton et al.
patent: 4225118 (1980-09-01), Ottemann
Levy Stuart S.
Matecki Katherine
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