Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D3/00—Portable or mobile lifting or hauling appliances
  • B66D3/04—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage
  • B66D3/06—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage with more than one pulley
  • B66D3/10—Applications of braking or detent devices

Definitions

• the invention relates to a self-locking safety winch. These winches are very often used in building sites and in general in the field of civil and mechanical constructions to raise and lower loads of all types, with manual operation by two operators, one on the ground and the other located at the same height as the winch.
• the main aim of the present invention is to provide a self-locking safety winch of contained size and weight, as well as being economical.
• a further aim of the present invention is that it provides a self-locking safety winch wherein the braking action is gradual and non-violent and therefore limits wear on the rope, lengthening the working life thereof.
• a further aim of the present invention is to provide a self-locking safety winch which is reliable and safe for operators and third persons, for improving safety at the workplace.
• a further aim of the invention is to provide a self-locking safety winch which is easy to maintain.
• a self-locking safety winch comprising a frame, a shaft mounted on the frame and a disc rotatingly mounted on the shaft, a rope supported by the disc, and special means for locking mounted on the frame;
• the means for locking comprise a fixed element constrained to the frame and a mobile element which operates between a position near the fixed element in which the rope is locked between the fixed element and the mobile element, and a distanced position with respect to the fixed element, in which the Disclosure of Invention
• figure 1 shows a side view of the winch of the present invention, in a position in which the rope is free to run;
• figure 2 is the same winch in a position in which the rope is locked;
• figure 2a is an enlarged detail of figure 2;
• figure 3 is a perspective view of a detail of the locking mechanism of the winch of the present invention.
• 1 denotes in its entirety a self- locking safety winch according to the present invention.
• the safety winch 1 essentially comprises a disc 1 which rotates about a shaft 4 mounted on a frame 5.
• the disc 2 has a gullet 3 along a circumferential surface.
• the frame 5, for compactness and simplicity, as well as for increasing operator safety, is preferably a shaped as a closed box, having one or more upper walls 7, one or more side walls 8 and one or more lower walls 9. On at least one of the lower walls there is at least one opening 10 through which the rope 11 passes into the frame 5.
• the frame 5 is normally provided with special means for suspending 6 for mounting the winch 1 on a suitable support structure (not illustrated in the figure), fixed or mobile depending on the operator's choice.
• this means for suspending 6 can be a hook 6a fixed to the upper wall 7 of the frame 5.
• the rope 11 obviously exhibits two ends: one end is the pull end 12 which is generally manoeuvred by the operator located on the ground, and the other end is the load end 13 to which the load to be raised or lowered is secured.
• the means for locking 14 are mounted on the frame 5 of the winch 1 at the disc 2 position, and are operatively active on the rope 11 on tiie pulling end 12; the means for locking comprise at least one fixed element 14a constrained to tiie frame and at least one mobile element 14b.
• the fixed element 14a in a preferred and non-exclusive embodiment, exhibits a cylindrical conformation and can also comprise a special gullet around its circumferential surface.
• the mobile element 14b operates between a near position hard by the fixed element 14a, in which the rope 11 is locked between the fixed element 14a and the mobile element 14b, and a distanced position away from the fixed element 14a, in which the rope is free to run.
• the mobile element 14b in a preferred and non-exclusive embodiment, is wedge-shaped and comprises a flat contact surface 15 positioned on the same side as tiie rope and on the opposite side with respect to the disc 2.
• the contact surface 15 is provided with an inclined end 18 so as better to engage the rope 11 during the locking phase.
• the mobile element 14b also comprises a curved guide surface 19 located on tiie same side as the disc 2 and on the opposite side with respect to the rope 11, so as better to suit the profile of tiie circumferential surface of tiie disc 2, for example so that it can insert in the gullet 3 of the disc 2.
• the mobile element 14b also exhibits, on the guide surface 19, a longitudinal slot 16 which engages on a fixed pivot 17 mounted on the frame 5.
• the above-described characteristics enable the mobile element 14b to move, with respect to the fixed element 14a, between a distanced position and a near position, and vice versa.
• tiie dragging of the rope 11 against the contact surface 15 of the mobile element 14b moves tiie mobile element 14b by friction towards the fixed element 14a.
• the rope 11 is therefore blocked between the mobile element 14b and the fixed element 14a, and the load on the load side 13 of the rope 11 cannot fall dangerously to earth.
• tiie invention achieves tiie set aims.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Emergency Lowering Means (AREA)
• Load-Engaging Elements For Cranes (AREA)
• Pulleys (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11454076

Family Applications (1)

Country Status (6)

Cited By (4)

Citations (4)

• 2001
  • 2001-04-02 IT IT2001RE000031A patent/ITRE20010031A1/it unknown
• 2002
  • 2002-01-29 EP EP02711212A patent/EP1373121B1/en not_active Expired - Lifetime
  • 2002-01-29 AT AT02711212T patent/ATE299469T1/de active
  • 2002-01-29 DE DE60205020T patent/DE60205020T2/de not_active Expired - Lifetime
  • 2002-01-29 WO PCT/IT2002/000043 patent/WO2002079069A1/en not_active Application Discontinuation
  • 2002-01-29 ES ES02711212T patent/ES2245400T3/es not_active Expired - Lifetime

Patent Citations (4)

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