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
1998-08-26
2000-03-14
Walsh, Donald P.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
74416, 74665H, 74724, B66D 114
Patent
active
060361743
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a powered winch, especially for sail boats, i.e. a winch with a drum which in the winding direction may be driven with two different speeds by means of a relatively simple gear mechanism which reacts to the two different ways depending on the direction of rotation of the used reversible motor without any special readjustment means.
2. Description of Related Art
In published British Patent Application GB-A-2,276,137 it is known that this result is achieved by letting the motor drive a driving shaft carrying a large and a small gear wheel, in that between the driving shaft and the large gear wheel there is inserted a gear wheel hub arranged as a one-way clutch. The large gear wheel is driving an even larger gear wheel on an output shaft also carrying a lesser gear wheel, which is driving an internal tooth rim on the winch drum. Thereby, in one direction of rotation of the motor, a direct driving connection between the driving shaft and the output shaft will be established, while this connection is passive in the opposite direction of rotation of the motor and thereby of the driving shaft.
The small gear wheel on the driving shaft is in permanent engagement with a larger gear wheel on an intermediate shaft, which also carries a lesser gear wheel having a permanent driving connection to the large gear wheel on the output shaft. The larger gear wheel on the intermediate shaft has a hub part in form of a one-way clutch giving free wheel at the said only direction of rotation of the driving shaft while the clutch is engaged in the opposite direction of rotation where the said direct drive will be disengaged. In the opposite direction of rotation the transmission will thus take place through the intermediate shaft with an appreciably lower gear ratio and with a shift of the direction of rotation, so that the output shaft will turn in the same direction in spite of the change of the rotational direction, now only with a lower rpm.
SUMMARY OF THE INVENTION
By the invention there is achieved a similar effect as with the above-described prior art, but with a considerably simplified gear arrangement.
By the invention it has been realized, that this construction may be arranged in the simple way as indicated below, in that the driving and output shaft hereby acts as the same element, while the intermediate shaft is reduced to an axle journal only supporting a single gear wheel and which as a whole is situated internally between the main shaft in question and the periphery of the large gear wheel on the driving shaft. This gives the possibility of a very compact design of the whole gear arrangement in the winch, something which is essential with regard to economy and need for space.
By using winches with one-way clutches it will be achieved that the winch drum may be accelerated quickly and rotated without noticeable friction as the mass of shafts and gear wheels in permanent driving connection with the drum is reduced considerably. It is suitable to utilize such a free wheel when manually hauling a slack rope before use is made of the motor winch.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in more detail in the following with reference to the drawing, which shows an elevated section of the gear in a winch according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
The FIGURE shows a housing 1 closed at the bottom with a precisely adapted bottom 2 which among others may contain fastening means. At the same time the bottom functions as basis for the fixed part of two roller bearings, an inner bearing 3 constituting a bottom bearing for a through-going shaft 4, and an outer bearing 3a constituting a main bearing for a specially shaped gear wheel 5. This bearing has a helically cut tooth gearing 6 outwardly on the periphery and an internal tooth gearing 7. The gear wheel is furthermore connected with the through-going shaft 4 by a further roller bearing 8. On the shaft 4 there is provided a rotatable bushin
REFERENCES:
patent: Re30423 (1980-10-01), Hutton et al.
patent: 3600977 (1971-08-01), Bogie
patent: 3712155 (1973-01-01), Stommel et al.
patent: 3728914 (1973-04-01), Guangorena et al.
patent: 3799005 (1974-03-01), Koehler
patent: 3942762 (1976-03-01), Reymond
patent: 3998431 (1976-12-01), Fawcett
Fr. Andersens Maskinfabrik A/S
Marcelo Emmanuel M.
Safran David S.
Walsh Donald P.
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