EP1373121A1 - Automatic locking device for a lifting block - Google Patents

Automatic locking device for a lifting block

Info

Publication number
EP1373121A1
EP1373121A1 EP02711212A EP02711212A EP1373121A1 EP 1373121 A1 EP1373121 A1 EP 1373121A1 EP 02711212 A EP02711212 A EP 02711212A EP 02711212 A EP02711212 A EP 02711212A EP 1373121 A1 EP1373121 A1 EP 1373121A1
Authority
EP
European Patent Office
Prior art keywords
winch
frame
rope
tiie
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02711212A
Other languages
German (de)
French (fr)
Other versions
EP1373121B1 (en
Inventor
Giorgio Veroni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Veroni Srl
Original Assignee
Veroni Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Veroni Srl filed Critical Veroni Srl
Publication of EP1373121A1 publication Critical patent/EP1373121A1/en
Application granted granted Critical
Publication of EP1373121B1 publication Critical patent/EP1373121B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Pulleys (AREA)

Abstract

A self-locking safety winch comprises a frame (5), a shaft (4) mounted on the frame (5) and a disc (2) rotatingly mounted on the shaft (4), a rope (11) supported by the disc (2), and special means for locking (14) mounted on the frame (5); the means for locking (14) comprise a fixed element (14a) constrained to the frame (5) and a mobile element (14b) which operates between a position near the fixed element (14a) in which the rope (11) is locked between the fixed element (14a) and the mobile element (14b), and distanced position with respect to the fixed element (14a), in which the rope (11) is free to run.

Description

Description
AUTOMATIC LOCKING DEVICE FOR A LIFTING BLOCK
Technical Field
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.
Background Art
Traditional winches do not have safety devices preventing the load from falling very dangerously to earth in cases where, due to carelessness or physical tiredness or the like, the operator on the ground suddenly loses grip of his part of the rope. In some prior art devices this poor safety level has been addressed by including a gearwheel, coaxial to the pulley wheel. A pinion is arranged on the pulley winch, which engages whti the gearwheel to lock the winch. The main problem with tins solution is that the pinion has to be inserted manually between the teeth of the gearwheel and then released as and when needed, and thus not addressing the safety problem as accidental falls due to sudden release of the rope are not dealt with at all. Besides, the pinion insertion-removal operations can be problematic in themselves.
A further prior art solution is the one illustrated in patent EP 0968737, which consists of an automatic locking device based on the action of a counterweight, which, in a case of sudden release of the load, moves a braking block constrained to the frame of the winch, quickly bringing it into contact with the rope, thus stopping the movement of the rope. This solution has several drawbacks, both of a technical nature, mainly its unwieldiness and weight, and of an economic nature, as this device is expensive.
A disadvantage of this solution is that the rope is very subject to wear due to the violent and not gradual contact it has with the brake block during the braking stage.
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. Finally, a further aim of the invention is to provide a self-locking safety winch which is easy to maintain.
These aims and more besides are attained by 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
Further characteristics and advantages of the present invention will better emerge from the detailed description that follows of a preferred but non-exclusive embodiment of the invention, illustrated purely by way of a non-limiting example in the accompanying figures of the drawings, in which: 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.
With reference to the figures of the drawings, 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. In the simplest embodiment, 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. In a case of sudden release of ground-based operator's pull on the rope 11, 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.
To unlock the winch 1, it is sufficient slightly to move the operator pull end 12 of the rope 11 externally, i.e. away from the disc 2 (as shown in figure 1). The rope 11 releases the contact surface 15 of the mobile element 14b, which distances from the fixed element 14a and returns into the unlocked position by forced of gravity.
Thus tiie invention achieves tiie set aims.

Claims

Claims.
1). A self-locking safety winch, comprising: a frame (5); a shaft mounted on the frame (5); a disc (2) rotatably mounted on the shaft (4); a rope (11) supported by tiie disc (2) and having a pull end (12) and a load end
(13) opposite to the pull end (12); and means for locking (14) mounted on the frame (5), wherein the means for locking (14) comprise a fixed element (14a) solidly constrained to the frame (5) and a mobile element (14b) which operates between a near position to the fixed element (14a) in which tiie rope (11) is locked between the fixed element (14a) and the mobile element (14b) and a distanced position from tiie fixed element (14a) in which the rope (11) is free to run.
2). The winch of claim 1, wherein the means for locking (14) are operatively active on tiie rope (11) on the operator pull side (12) of the disc (2). 3). The winch of claim 1, wherein the mobile element (14b) exhibits a wedge shape.
4). The winch of any one of the preceding claims, wherein the mobile element
(14b) comprises: a flat contact surface (15) located on a same side as the rope (11) and on an opposite side from the disc (2); a curved guide surface (19) located on a same side as the disc (2) but an opposite
5). The winch of claim 4, wherein the mobile element (14b) affords a longitudinal slot (16) along tiie guide surface (19) thereof, the longitudinal slot (16) being engaged with a fixed pivot (17) mounted on the frame (5), in order to enable a displacement of the mobile element (14b).
6). The winch of any of claims 1, 2 or 3, wherein the frame (5) exhibits a box configuration comprising at least an upper wall (7), at least a side wall (8) and at least a lower wall (9) in which at least one aperture (10) is afforded for passage ofthe rope (l l).
7). The winch of any of claims 1, 2 or 3, wherein tiie frame (5) comprises means for suspending (6) for mounting the winch (1) on a support structure. 8). The winch of claim 7, wherein the means for suspending (6) for mounting the winch (1) on a support structure comprise at least one hook (6a) fixed to tiie at least an upper wall (7) of the frame (5).
EP02711212A 2001-04-02 2002-01-29 Automatic locking device for a lifting block Expired - Lifetime EP1373121B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITRE20010031 2001-04-02
IT2001RE000031A ITRE20010031A1 (en) 2001-04-02 2001-04-02 SELF-LOCKING SAFETY PULLEY
PCT/IT2002/000043 WO2002079069A1 (en) 2001-04-02 2002-01-29 Automatic locking device for a flifting block

Publications (2)

Publication Number Publication Date
EP1373121A1 true EP1373121A1 (en) 2004-01-02
EP1373121B1 EP1373121B1 (en) 2005-07-13

Family

ID=11454076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02711212A Expired - Lifetime EP1373121B1 (en) 2001-04-02 2002-01-29 Automatic locking device for a lifting block

Country Status (6)

Country Link
EP (1) EP1373121B1 (en)
AT (1) ATE299469T1 (en)
DE (1) DE60205020T2 (en)
ES (1) ES2245400T3 (en)
IT (1) ITRE20010031A1 (en)
WO (1) WO2002079069A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE531962C2 (en) * 2007-09-26 2009-09-15 Selden Mast Ab Sailboat for sailboat
FR2922200B1 (en) * 2007-10-12 2010-04-23 Marcel Jose Peltier PULLEY SYSTEM WITH LOWERING OF BRAKE LOAD
WO2011042571A1 (en) * 2009-10-05 2011-04-14 Muelas Allegue, Jesus Maria Pombo safety device for braking, adjusting tension and retaining a load on pulleys
JP6312223B2 (en) * 2015-10-13 2018-04-18 株式会社古屋興産 Unloading aid

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1167295A (en) * 1914-12-07 1916-01-04 John Smith Hall Pulley-block.
JPS499333Y1 (en) * 1970-11-24 1974-03-05
US4934660A (en) * 1987-10-02 1990-06-19 D B Industries, Inc. Device for raising and lowering loads
US5615865A (en) * 1995-03-08 1997-04-01 Fountain; Edward Automatically engaging and disengaging pawl and pulley lifting mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02079069A1 *

Also Published As

Publication number Publication date
ITRE20010031A0 (en) 2001-04-02
ITRE20010031A1 (en) 2002-10-02
EP1373121B1 (en) 2005-07-13
ATE299469T1 (en) 2005-07-15
ES2245400T3 (en) 2006-01-01
DE60205020T2 (en) 2006-06-01
DE60205020D1 (en) 2005-08-18
WO2002079069A1 (en) 2002-10-10

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