Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
  • B66D1/28—Other constructional details
  • B66D1/36—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains
  • B66D1/38—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains by means of guides movable relative to drum or barrel

Definitions

• the invention concerns an appliance which becomes necessary to wind a wire evenly over the full length of the drum in cases where the fleet angle exceeds approx.4 o or where the distance of the lead or fixed sheave in front of the drum is shorter then approx.7 times the drumlength.
• a wellknown device fulfilling these conditions produces the required path by means of a sheave rotating and translating along a shaft which in turn, by means of cranks placed at either end at different angles, makes an oscilating movement in front of the drum, the character of the path being governed by the length and angle of the cranks.
• the use of swiveling bearings for this shaft restricts the cranklength in comparison with the drum length and so the application to the condition a > 2.4 b.
• the required path is produced by a "tumbler" sheave, pivoting on a foundation in front of the drum such that the tangent to drum and fixed lead halves the tumblers height, causing the wire reaction to point at the hinge.
• each ratio a/c determines one optimum curve/radius and minimum size of the spooler related to b.
• the number of layers on the drum has limits, if the tangent cuts the tumbler above midheight, then a preference for the central part of the drum will be shown (empty drum) whereas guiding on to a full drum a preference for the sides will be shown. Due to the steering forces developed by the wire already on the drum, the working range between unacceptable preferences is sufficient for practical use and can be increased by choosing a larger tumbler than the minimum size. Besides : the tendency to cover the sides of a full drum may be useful in cases where a mechanically driven tumbler spooler may be advantageous in comparison with the usual transverse guiding-on gear with diamond threaded drive shaft, where the required force is much heavier (fig.5) and the means weaker.
• a practical way of producing the required path is found in a tumbler not having a fixed hinge pin, but a round toe which while rocking is also rolling over a transverse rail, thus reducing the physical dimensions of the tumbler, reducing support pressure by spreading it over a larger surface and enabling the device to be counterbalanced so that, when the wire slackens, it remains in its original position (fig.3) Structurally the generated forces in the tumbler do not require the use of special material or parts.
• a centering system to ensure the tumbler is kept central in front of the drum using cross wire ropes and a wide enough toe to ensure lateral stability is simple but sufficient.
• a further measure to minimize sheave wear is given by an additional hinge point in the centreline of the winch, at a certain distance from the device causing the toe to swing gradually over the rail in order to swivel the sheave in the correct angle of the wire run from drum to fixed lead.
• This may be realised by means of a protruding cam near the bottom of the toe reaching into a fixed camplate, in which it moves vertically up and down when the tumbler rocks and rolls.
• camplate is also mounted at the other side of the tumbler with a different shaped profile to follow the cam along its path, then the tumbler will be secured in all directions and can be used in all positions if required.
• Fig.4 presents a compact winch arrangement, providedwith slotted plates and cam (2)
• fig.5 shows a tumbler spooler with mechanical external drive.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Transmission Devices (AREA)
• Guides For Winding Or Rewinding, Or Guides For Filamentary Materials (AREA)
• Ropes Or Cables (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19839233

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (10)

Family Cites Families (1)

• 1982
  • 1982-02-11 NL NL8200512A patent/NL8200512A/nl not_active Application Discontinuation
• 1983
  • 1983-04-07 WO PCT/NL1983/000013 patent/WO1984003876A1/en active IP Right Grant
  • 1983-04-07 EP EP83901234A patent/EP0171386B1/de not_active Expired

Patent Citations (10)

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