Winding – tensioning – or guiding – Reeling device – With brake
Patent
1996-07-02
1998-08-18
Jillions, John M.
Winding, tensioning, or guiding
Reeling device
With brake
182233, 254377, B65H 7530, B66D 518
Patent
active
057948801
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an improvement in a driven barrel of a winch device to stop a rope to be unwound from the barrel when the rotation speed of the barrel increases over a certain value in one direction, whereat the driven barrel includes a closed cylindric space which is concentric with the barrel and accomodates a piston, which can move on an axis from one end of the cylindric space to the other in non-rotatable connection with the inside of the barrel, the axis having screw threads and the piston having a center bore with screw threads meshing with the screw threads of the axis, whereat the cylindric space contents a fluid and the piston is given a leak from one side of the piston to the other side.
The invention particularly relates to a winding barrel in a hoisting machine intended for sick or handicapped persons. In such cases the hoisting machine is disposed on a ceiling or a stand and by winding up a cable or the like on its barrel a person in a harness is lifted. It is important that such machines are safe, compact and easily operated. The barrel is driven via a gearing, or some form of a belt driving and not infrequently it happens that there is a machine or power supply failure. This may result in the barrel rotating freely counter to its winding direction, such as to allow the cable to run either during hoisting or lowering, thus causing the person to fall to the floor or on to some other structure and possibly resulting in an injury. Limit switches are indeed often provided for the extreme positions for the barrel, for inhibiting the drive to the barrel, or stopping it from rotating, but disturbances occur relatively often in these functions. There is also the ambition to make the drive means as small and as cheap as possible, which can lead to these means not standing up to overloads. In addition, a continuously driven barrel has no natural end positions and should operation be incorrect, this could lead to the cable being wound up on the barrel in the wrong direction of rotation. This would mean that the limit switches function in the wrong order and wrong lift hights would be obtained for the hoisting apparatus. The object of the invention is to stop the rotation of the barrel if the rotary speed in one direction should happen to increase over a certain value.
An embodiment of the invention will now be described with reference to the enclosed drawings.
FIG. 1 is a side view of a barrel of a winch and its driving motor.
FIG. 2 is a cross section through the barrel along the line A--A in FIG. 1.
FIG. 3 is a longitudinal section through the barrel, showing the supporting axis and driving gear along the line B--B in FIG. 2.
The hoisting device thus includes a barrel 1, which is driven to rotate by a motor 2 via a gear 3. The driving means are arranged at the right end of the barrel 1. A belt is denoted by 4 and is wound up on the barrel. The barrel is supported by bearings in end walls 5 of a housing 6, which is supported by an elevated situated arm or is supported by a ceiling. The barrel 1 thus is supported in its left end by the end wall 7 and a bearing 8 and in its right end by the right end wall 5 via a bearing 9 and a shaft pivot, which is extended from the right end wall of the barrel. The axis 12 extends through the barrel 1 and supports the bearing 8 of the barrel in the left end wall 7 of the barrel but is fixed in the left end wall 7 by a washer 13 and screws 14. The barrel 1 can thus freely rotate in relation to the axis 12. The axis 12 is provided with a helical thread 15 of suitable pitch. As can be seen the barrel has a cylindrical space 16 between its two ends. A piston 17 is arranged within the cylindrical space 16. The piston runs within the cylindrical space to-and-from and is provided by a central bore having threads 18 of a pitch in correspondence with the form and pitch of the threads 15. The piston 17 is further fixed to the barrel 1 by two keys 19 in the inner side of the barrel and two keyways 20 on the outside of the piston, see FIG. 2. Keys and keyways ar
REFERENCES:
patent: 238552 (1881-03-01), Barlow
patent: 3595528 (1971-07-01), Virkki
patent: 4047487 (1977-09-01), Wyss
patent: 4452430 (1984-06-01), Kankkunen
patent: 5046402 (1991-09-01), Lagace
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