EP0968737B1 - Riemenscheibe mit automatischer Notbremse - Google Patents

Riemenscheibe mit automatischer Notbremse Download PDF

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Publication number
EP0968737B1
EP0968737B1 EP99112036A EP99112036A EP0968737B1 EP 0968737 B1 EP0968737 B1 EP 0968737B1 EP 99112036 A EP99112036 A EP 99112036A EP 99112036 A EP99112036 A EP 99112036A EP 0968737 B1 EP0968737 B1 EP 0968737B1
Authority
EP
European Patent Office
Prior art keywords
rope
pulley
pull
leg
rocker arm
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.)
Expired - Lifetime
Application number
EP99112036A
Other languages
English (en)
French (fr)
Other versions
EP0968737A2 (de
EP0968737A3 (de
Inventor
Giovanni Ravaglia
Angelo Olani
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.)
Tornomeccanica Srl
Original Assignee
Tornomeccanica 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
Priority claimed from IT98GE000022 external-priority patent/IT245196Y1/it
Priority claimed from IT1999GE000057A external-priority patent/IT1309146B1/it
Application filed by Tornomeccanica Srl filed Critical Tornomeccanica Srl
Publication of EP0968737A2 publication Critical patent/EP0968737A2/de
Publication of EP0968737A3 publication Critical patent/EP0968737A3/de
Application granted granted Critical
Publication of EP0968737B1 publication Critical patent/EP0968737B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/16—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes for action on ropes or cables
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B1/00—Devices for lowering persons from buildings or the like
    • A62B1/06—Devices for lowering persons from buildings or the like by making use of rope-lowering devices

Definitions

  • Pulleys to facilitate hoisting and lowering of loads and general products are well known. These pulleys are especially used in the building and construction sectors and are normally handled by two persons, one of them being placed at the top where the pulley is fastened and the other at floor level.
  • This pulley consists of a disk with a supporting groove or race guiding the rope, idling around its shaft supported by a yoke equipped with a fastening device.
  • pulleys have no protective device to prevent the load from falling down when the pull leg of the rope is released by the operator at floor level.
  • Some pulleys have been provided with a safety ratchet gear blocking the load and consisting of a gear wheel keyed onto the disk shaft and a ratchet but this safety system has serveral drawbacks, the most important of which is the fact that this ratchet gear has to be released for each operation and this is extremely dangerous
  • WO 97/17107 A for example, has a swinging brake, which blocks the rope by swinging a lever into a blocking position, when the rope moves in the wrong direction.
  • This invention has the aim to eliminate this drawback and to provide the pulley with an automatic safety brake.
  • This braking system consists of a double walled rocker arm having the shape of a right-angled triangle, its hypotenuse being slantwise located at the top, its smaller acute angle ( ⁇ ) located at the bottom towards the load leg of the rope, whereas the greater acute angle ( ⁇ ) is located at the upper end of the manual pull leg of the rope.
  • This rocker arm is secured to the outside of the pulley yoke by means of transverse axed pivot pins, slightly offset with respect to the shaft axis of the pulley sheave in direction of the manual pull rope.
  • a snatch block is fastened at right-angle ( ⁇ ) level of the rocker arm at the bottom towards the pull rope, whereas an adjustable counterweight is mounted at the level of the smaller acute angle ( ⁇ ).
  • ⁇ right-angle
  • ⁇ right-angle
  • ⁇ right-angle
  • ⁇ right-angle
  • the pulley consists of a disk 1, with a peripheral groove 2 supporting and guiding the rope 3; this disk is rotating on its shaft 4 transverse mounted on the pulley yoke 5.
  • This yoke 5 features at its upper end a device 6 of any kind by which the pulley may be fastened to a supporting structure such as for instance the pipe of a scaffolding.
  • the pulley features a double walled rocker arm 9 shaped like a right angled triangle, its hypotenuse being slantwise located at the top, its smaller acute angle ⁇ being located at the bottom towards the load leg 8 of the hoisting rope, whereas the greater acute angle ⁇ is located at the manual pull leg 7 of the rope.
  • this rocker arm 9 The external walls of this rocker arm 9 are fastened onto the pulley yoke 5 by means of transverse pivot pins 10 slightly off-centred with respect to the shaft axis 4 of the pulley disk 1 in the direction of the manual pull leg 7 of the rope.
  • a snatch block 11 with transverse revolving axle is fixed to the rocker arm on which the pulling leg 7 of the rope is sliding, whereas an adjustable counterweight 12 is mounted at the level of the smaller acute angle ⁇ .
  • a transverse axed pin 13 bearing a grip wedge 14 with rifled or toothed lower surface which may be inserted between the rope 3 resting on the race 2 of the pulley disk 1 and a bushing 15 mounted on the transverse pin 16 fastened to the yoke 5, thus compressing and blocking the rope inside the pulley race 2.
  • transverse catch 17' located at right angle level ⁇ with the aim to prevent undesirable shifting of the rope while another transverse catch 17, located at the level of the smaller acute angle ⁇ , will act as a releasing and lowering device for the load rope 8 when without load (cf. Fig. 9 ).
  • the counterweight 12 is adjustable in various positions 18 so as to adjust the lever arm to the pivot pin 10 of the rocker arm 9 depending from the pulley height and the resulting length and weight of te pull rope.
  • the above invention may be used with any sheave or pulley, with different lifting power and applications, if necessary by replacing some components by others having the same objective.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Lowering Means (AREA)
  • Pulleys (AREA)
  • Braking Arrangements (AREA)

Claims (5)

  1. Flaschenzug mit automatischer Sicherheitsbremse, der aus einer Scheibe (1) mit peripherischer Laufrille (2) besteht, um das Seil (3) zu stützen und zu leiten, während sich die Scheibe (1) um ihre durch ein Traglager (5) gestützte Welle (4) dreht, dieses Traglager ist mit der oberen Kupplungsvorrichtung (6) einer beliebigen Art versehen, während das Seil (3) einen Zieh-Strang (7) und einen Lade-Strang (8) hat, um die Ladung herauf und herunter zu lassen, wo
    - ein Kipphebel mit Doppelwand (9), der wie ein rechteckiges Dreieck mit Hypotenuse geformt und schräg oben angebracht ist und zwei spitze Winkel aufweist, dessen größerer (β) auf dem Zieh-Strang (7) und dessen kleinerer Winkel (α) am Lade-Strang (8) des Seils und ein fast rechter Winkel (γ) angebracht ist, wo der genannte Kipphebel (9), der mit seinen beiden außerhalb des Traglagers (5) des Flaschenzugs liegenden Wänden durch quer laufende Drehbolzen (10) zentral befestigt ist, die außerachsig sind hinsichtlich der Welle (4) der Scheibe (1) in Richtung des Zieh-Seils (7);
    - eine Umlenkrolle (11) mit Quer-Achse, an der Seite des rechten Winkels (γ) des Kipphebels (9) angebracht ist, auf der der Zieh-Strang (7) des Seils (3) gleitet;
    - ein verstellbares Gegengewicht (12) an der Seite des kleineren spitzen Winkels (α) des Kipphebels (9) montiert ist;
    - eine Lagerbuchse (15) auf einen Bolzen (16) mit Quer-Achse auf dem Flaschenzug-Traglager (5) montiert ist;
    - ein Bolzen mit Quer-Achse (13), der an der Seite des größeren spitzen Winkels (β) des Kipphebels (9) angebracht ist und einen Klemmkeil (14) trägt, der zwischen dem Seil (3) in der Laufrille (2) der Flaschenzug-Scheibe (1) und der quer-achsigen Lager-Buchse (15) gleitet und so das Seil (3) in der Laufrille (2) zusammenpresst und blockiert oder die blockierende Stellung aufgibt und das Seil (3) freilässt, so dass durch Ziehen (Pfeil T) des Zieh-Strangs (7) des Seils und Stoßen der Umlenkrolle (11) der Kipphebel (9) (Pfeil O) sich dreht und den Klemmkeil (14) entfernt, während das Gegengewicht (12) durch Freilassen des Zieh-Strangs (7) des Seils veranlasst, dass sich der Kipphebel dreht (Pfeil A) und den Klemm-Keil (14) dabei einfügt und damit das Seil (3) blockiert.
  2. Flaschenzug, wie in Anspruch 1 beschrieben, gekennzeichnet dadurch, dass in Übereinstimmung mit dem kleineren spitzen Winkel (α) ein Quer-Stift (17) vorgesehen ist, der bei Bewegung des Seils (Pfeil L) die Funktion einer Sperrklinke hat, und er dient zur Befreiung des Lade-Seils (8) und zu seinem Herunterlassen ohne Ladung.
  3. Flaschenzug, wie in Anspruch 1 beschrieben, gekennzeichnet dadurch, dass in Entsprechung des fast rechten Winkels (γ) ein Querstift (17') vorgesehen ist, um unvorhergesehene und unerwünschte Bewegungen des Zieh-Seils (7) zu vermeiden.
  4. Flaschenzug, wie in Anspruch 1 beschrieben, gekennzeichnet dadurch, dass das Gegengewicht (12) in verschiedenen Stellungen (18) angebracht werden kann, so dass es möglich ist, den Hebearm hinsichtlich der Dreh-Bolzen-Achse (10) des Kipphebels in Abhängigkeit vom Gewicht und der Länge des Zieh-Seils (7) zu regulieren.
  5. Flaschenzug, wie in Anspruch 1 beschrieben, gekennzeichnet dadurch, dass die untere Oberfläche des Klemmkeils (14), die zum Seil (3) zeigt, bearbeitet ist, sie ist geriffelt oder verzahnt, um die gegenseitige Blockierungswirkung zu vermehren.
EP99112036A 1998-07-02 1999-06-22 Riemenscheibe mit automatischer Notbremse Expired - Lifetime EP0968737B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITGE980022U 1998-07-02
IT98GE000022 IT245196Y1 (it) 1998-07-02 1998-07-02 Carrucola per edilizia con freno automatico di sicurezza.
ITGE990057 1999-05-28
IT1999GE000057A IT1309146B1 (it) 1999-05-28 1999-05-28 Carrucola con freno automatico di sicurezza

Publications (3)

Publication Number Publication Date
EP0968737A2 EP0968737A2 (de) 2000-01-05
EP0968737A3 EP0968737A3 (de) 2001-09-19
EP0968737B1 true EP0968737B1 (de) 2008-04-23

Family

ID=26330634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99112036A Expired - Lifetime EP0968737B1 (de) 1998-07-02 1999-06-22 Riemenscheibe mit automatischer Notbremse

Country Status (6)

Country Link
EP (1) EP0968737B1 (de)
AT (1) ATE392923T1 (de)
DE (1) DE69938572T2 (de)
DK (1) DK0968737T3 (de)
ES (1) ES2306491T3 (de)
PT (1) PT968737E (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2431907B (en) * 2005-11-02 2009-04-15 Balfour Beatty Plc Device for use in lowering loads

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2528410A1 (de) * 1975-06-25 1977-01-13 Matsumoto Kiko Co Verlangsamende flucht- bzw. rettungseinrichtung
US5348117A (en) * 1992-08-12 1994-09-20 Pickering Gregory R Rescue system
AU3921595A (en) * 1995-11-06 1997-05-29 Rollgliss Ag Rope hoisting and lowering device

Also Published As

Publication number Publication date
DK0968737T3 (da) 2008-09-01
DE69938572T2 (de) 2009-05-28
DE69938572D1 (de) 2008-06-05
ES2306491T3 (es) 2008-11-01
EP0968737A2 (de) 2000-01-05
ATE392923T1 (de) 2008-05-15
EP0968737A3 (de) 2001-09-19
PT968737E (pt) 2008-07-29

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