EP0825147B1 - Safety crank - Google Patents

Safety crank Download PDF

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Publication number
EP0825147B1
EP0825147B1 EP97112004A EP97112004A EP0825147B1 EP 0825147 B1 EP0825147 B1 EP 0825147B1 EP 97112004 A EP97112004 A EP 97112004A EP 97112004 A EP97112004 A EP 97112004A EP 0825147 B1 EP0825147 B1 EP 0825147B1
Authority
EP
European Patent Office
Prior art keywords
hub
housing
cam disc
rolling body
housing wall
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
EP97112004A
Other languages
German (de)
French (fr)
Other versions
EP0825147A2 (en
EP0825147A3 (en
Inventor
Holger Wolschendorf
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.)
Gebr Wittler & Co KG GmbH
Original Assignee
Gebr Wittler & Co KG GmbH
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 Gebr Wittler & Co KG GmbH filed Critical Gebr Wittler & Co KG GmbH
Publication of EP0825147A2 publication Critical patent/EP0825147A2/en
Publication of EP0825147A3 publication Critical patent/EP0825147A3/en
Application granted granted Critical
Publication of EP0825147B1 publication Critical patent/EP0825147B1/en
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
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02—Driving gear
    • B66D1/04—Driving gear manually operated
    • B66D1/06—Safety cranks for preventing unwanted crank rotation and subsequent lowering of the loads

Definitions

  • the present invention relates to a safety crank according to the preamble of Claim 1.
  • a safety crank is known from FR-A-1 091 122.
  • the braking device is also disengaged constructional frictional forces between the housing wall and the brake shoes, which make it difficult to operate this safety crank.
  • the present invention is therefore based on the object of a safety crank of the generic type to be designed so that they are both less expensive to manufacture is operable, as well as better usability.
  • the rolling element which is preferably designed as a pressure roller, leads for the case an unintentional sudden drop in load in conjunction with that in the Contact area designed as a cam disc for immediate jamming, practically no unrestrained return, not even a short one Route is done.
  • the braking effect occurs compared to the known safety cranks thus much more likely.
  • the rolling element is held in an optimal position with regard to its effect, so that the clamping and thus a If necessary, the hub is braked immediately.
  • the rolling elements Side are embedded in the hub, for example, sliding rollers, the can freely rotate in the hub and are supported on the housing wall.
  • the casters of which preferably three are provided, arranged at the same angular distance from each other, so that each according to the direction of rotation of the drive part, always two rollers together with one Rolling elements are loaded accordingly.
  • a safety crank is shown, which is a cylindrical Has housing 1, which can be fixed by a molded tab 2 on site.
  • a hub 5 is mounted, which has a bore 13 into which one output shaft, not shown, can be inserted in a form-fitting manner.
  • crank arm 3 On the hub 5, a drive part is guided in the form of a crank arm 3, in which a Driver 4 is attached, which projects into the interior of the housing 1. Using a locking ring 12, the crank arm 3 is secured on the hub 5.
  • This area of contact of the hub 5 with the pressure rollers 7, 7a is mirror-symmetrical formed as a cam 6, the smallest distance to the wall of the Housing 1 smaller and their greatest distance equal or slightly larger than that Diameter of the pressure rollers is 7.7a.
  • Each of these pressure rollers 7, 7 a is connected to the cam disc 6 by means of a compression spring 8 pressed, each compression spring 8 in a receptacle 9 provided in the hub 5 lies and is supported there on the face.
  • one or more of a suitable one can also be used Material with low friction coefficient existing sliders provided be in the hub 5 and rest on the wall of the housing 1 and in If the brakes are applied, support the hub 5.
  • three casters 10 are provided, which are the same Angle distance, preferably at an angle of 60 ° to each other.
  • the safety crank in the example shown is for a right as well suitable for left-hand operation.
  • the crank arm 3 is actuated connected driver 4, depending on the direction of rotation, either against the pressure roller 7 or pressed against the pressure roller 7a, the associated compression spring 8 in the receptacle 9 is pressed so that the pressure roller 7,7a abuts on the hub and this and with it the inserted output shaft rotates.
  • crank arm 3 is opposed rotated, the driver indirectly, as in the present embodiment, or rests directly on the hub.
  • the driver is located when the crank arm 3 is actuated 4 directly on the hub while the pressure roller 7 or 7a on the other side of the driver 4 is pressed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
  • Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

The safety crank handle has a housing fixable secure against rotation on the structure side and a hub (5) which can be fixed opposite the housing by a brake device. Between the hub (5) and housing wall is one or more rolling bodies on which an entrainment member (4) is supported during operation of the drive part . The hub is formed in the contact area with the rolling body as a cam disc (6) whose smallest distance from the housing wall is less than the diameter of the rolling body and whose greatest distance from the housing wall is equal to or slightly more than the diameter of the rolling body. The rolling body can be pressed against the cam disc by a compression spring (8) lying in a socket (9) in the hub (5).

Description

Die vorliegende Erfindung betrifft eine Sicherheitskurbel gemäß dem Oberbegriff des Anspruches 1. Eine derartige Sicherheitskurbel ist aus FR-A-1 091 122 bekannt.The present invention relates to a safety crank according to the preamble of Claim 1. Such a safety crank is known from FR-A-1 091 122.

Eine andere Sicherheitskurbel ist aus DE-A 195 24 272 bekannt. Diese ist jedoch von ihrem Aufbau her recht kompliziert und besteht dabei aus einer Vielzahl von Einzelteilen, die z.T. in aufwendigen Fertigungsverfahren herstellbar sind. Hierdurch ergeben sich erhebliche Herstellungskosten, die vor allem auch deshalb als besonders nachteilig anzusehen sind, weil solche Sicherheitskurbeln in relativ hohen Stückzahlen gefertigt werden.Another safety crank is known from DE-A 195 24 272. This is however, its structure is quite complicated and consists of a large number of individual parts, some of which can be produced in complex manufacturing processes. hereby there are considerable manufacturing costs, which is mainly because are particularly disadvantageous because such safety cranks in relatively high Quantities are manufactured.

Darüber hinaus ist die Störanfälligkeit, insbesondere aufgrund der vielen vorhandenen Einzelteile recht hoch, mit der Folge einer die Betriebskosten erhöhenden Verkürzung der Standzeit.In addition, the susceptibility to failure, especially due to the many existing Individual parts quite high, with the result that the operating costs increase Shortening the service life.

Neben diesen kostenmäßigen Nachteilen treten auch bei Nichteingriff der Bremseinrichtung konstruktionsbedingt Reibungskräfte zwischen der Gehäusewandung und den Bremsbacken auf, die die Bedienung dieser Sicherheitskurbel erschweren. In addition to these cost disadvantages, the braking device is also disengaged constructional frictional forces between the housing wall and the brake shoes, which make it difficult to operate this safety crank.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Sicherheitskurbel der gattungsgemäßen Art so zu gestalten, daß sie sowohl kostengünstiger herstellund betreibbar ist, als auch eine bessere Bedienbarkeit erlaubt.The present invention is therefore based on the object of a safety crank of the generic type to be designed so that they are both less expensive to manufacture is operable, as well as better usability.

Diese Aufgabe wird durch eine Sicherheitskurbel gelöst, die die Merkmale des Anspruches 1 aufweist.This object is achieved by a safety crank that has the features of the claim 1 has.

Der Wälzkörper, der vorzugsweise als Druckrolle ausgebildet ist, führt für den Fall eines ungewollten plötzlichen Absinkens der Last im Zusammenspiel mit der im Berührungsbereich als Kurvenscheibe ausgebildeten Nabe zu deren sofortigen Verklemmung, wobei praktisch kein ungebremster Rücklauf, auch nicht über eine kurze Strecke erfolgt. Gegenüber den bekannten Sicherheitskurbeln tritt die Bremswirkung somit erheblich eher ein.The rolling element, which is preferably designed as a pressure roller, leads for the case an unintentional sudden drop in load in conjunction with that in the Contact area designed as a cam disc for immediate jamming, practically no unrestrained return, not even a short one Route is done. The braking effect occurs compared to the known safety cranks thus much more likely.

Als weitere Vorteile der Erfindung sind hervorzuheben, daß durch das Fehlen von Bremsbacken keine einen dauerhaften Betrieb der Sicherheitskurbel beeinträchtigende Reibungswärme erzeugt wird.It should be emphasized as further advantages of the invention that the absence of Brake shoes do not affect permanent operation of the safety crank Frictional heat is generated.

Auch ist hierdurch ein leichtes Absenken der anhängenden Last gegeben, was inbesondere bei einem langen Absenkweg von Vorteil ist.This also results in a slight lowering of the attached load, which in particular is advantageous for a long lowering path.

Das bei den bislang eingesetzten Bremsbacken übliche Schleifen der Bremsbacken an der Gehäusewandung entfällt bei dieser neuen Sicherheitskurbel, so daß keine entsprechenden Reibungskräfte überwunden werden müssen, wodurch beim Anheben einer Last eine leichtere Bedienung gegeben ist.The usual grinding of the brake shoes with the brake shoes used up to now this new safety crank eliminates the case wall so that none corresponding frictional forces must be overcome, which means when lifting a load is easier to operate.

Der Wälzkörper wird in einer bezüglich seiner Wirkung optimalen Stellung gehalten, so daß durch die verhinderte Rücklaufmöglichkeit die Klemmung und damit eine Bremsung der Nabe im Bedarfsfall sofort erfolgt.The rolling element is held in an optimal position with regard to its effect, so that the clamping and thus a If necessary, the hub is braked immediately.

Nach einem weiteren Gedanken ist vorgesehen, daß beidseitig des Mitnehmers jeweils ein Wälzkörper angeordnet ist, die Sicherheitskurbel also insoweit spiegelsymmetrisch ausgebildet ist.According to a further thought it is provided that the driver on both sides One rolling element each is arranged, so the safety crank is mirror-symmetrical is trained.

Hierdurch ist die Sicherheitskurbel für einen Links-Rechts-Betrieb geeignet. Überdies erfolgt eine sofortige Bremsung auch bei einem plötzlichen Lastrichtungswechsel, wie dies bei einem Umschlagen der angehängten Last gegeben ist. This makes the safety crank suitable for left-right operation. moreover there is an immediate braking even in the event of a sudden change in load direction, such as this is the case when the attached load is turned over.

Des weiteren ist vorgesehen, daß auf der den Wälzkörpern gegenüberliegenden Seite in die Nabe Gleitstücke, beispielsweise Gleitrollen eingelassen sind, die sich in der Nabe frei drehen können und sich an der Gehäusewandung abstützen.Furthermore, it is provided that on the opposite of the rolling elements Side are embedded in the hub, for example, sliding rollers, the can freely rotate in the hub and are supported on the housing wall.

Um eine gleichmäßige Druckverteilung auf die Wälzkörper einerseits und die Gleitrollen andererseits zu erreichen, sind die Gleitrollen, von denen vorzugsweise drei vorgesehen sind, in gleichem Winkelabstand zueinander angeordnet, so daß je nach Drehrichtung des Antriebsteiles immer zwei Gleitrollen zusammen mit einem Wälzkörper entsprechend belastet sind.To ensure an even pressure distribution on the rolling elements on the one hand and the To achieve casters on the other hand are the casters, of which preferably three are provided, arranged at the same angular distance from each other, so that each according to the direction of rotation of the drive part, always two rollers together with one Rolling elements are loaded accordingly.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Further advantageous embodiments of the invention are in the subclaims characterized.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der beigefügten Zeichnungen beschrieben.An embodiment of the invention is described below with reference to the accompanying Described drawings.

Es zeigen:

Figur 1
einen Teilquerschnitt durch eine erfindungsgemäße Sicherheitskurbel,
Figur 2
eine Draufsicht auf einen Teil der Sicherheitskurbel.
Show it:
Figure 1
a partial cross section through a safety crank according to the invention,
Figure 2
a top view of part of the safety crank.

In den Figuren ist eine Sicherheitskurbel dargestellt, die ein zylinderförmiges Gehäuse 1 aufweist, das über eine angeformte Lasche 2 bauseitig festsetzbar ist.In the figures, a safety crank is shown, which is a cylindrical Has housing 1, which can be fixed by a molded tab 2 on site.

In dem Gehäuse 1 ist eine Nabe 5 gelagert, die eine Bohrung 13 aufweist, in die eine nichtdargestellte Abtriebswelle formschlüssig einsteckbar ist.In the housing 1, a hub 5 is mounted, which has a bore 13 into which one output shaft, not shown, can be inserted in a form-fitting manner.

Auf der Nabe 5 ist in Form eine Kurbelarmes 3 ein Antriebsteil geführt, in dem ein Mitnehmer 4 befestigt ist, der in das Innere des Gehäuses 1 ragt. Mittels eines Sicherungsringes 12 ist der Kurbelarm 3 auf der Nabe 5 gesichert.On the hub 5, a drive part is guided in the form of a crank arm 3, in which a Driver 4 is attached, which projects into the interior of the housing 1. Using a locking ring 12, the crank arm 3 is secured on the hub 5.

Zu beiden Seiten des Mitnehmers 4 sind in dem Gehäuse 1, und zwar zwischen der Nabe 5 und der Gehäusewandung jeweils ein Wälzkörper in Form einer Druckrolle 7,7a angeordnet, wozu die Nabe 5 in diesem Bereich entsprechend ausgenommen ist.On both sides of the driver 4 are in the housing 1, between the Hub 5 and the housing wall each have a rolling element in the form of a pressure roller 7,7a arranged, for which the hub 5 is correspondingly excluded in this area is.

Dieser Berührungsbereich der Nabe 5 mit den Druckrollen 7,7a ist spiegelsymmetrisch als Kurvenscheibe 6 ausgebildet, deren geringster Abstand zur Wandung des Gehäuses 1 kleiner und deren größter Abstand gleich oder geringfügig größer als der Durchmesser der Druckrollen 7,7a ist. This area of contact of the hub 5 with the pressure rollers 7, 7a is mirror-symmetrical formed as a cam 6, the smallest distance to the wall of the Housing 1 smaller and their greatest distance equal or slightly larger than that Diameter of the pressure rollers is 7.7a.

Jede dieser Druckrollen 7,7a ist mittels einer Druckfeder 8 an die Kurvenscheibe 6 gedrückt, wobei jede Druckfeder 8 in einer in der Nabe 5 vorgesehenen Aufnahme 9 einliegt und sich dort stirnseitig abstützt.Each of these pressure rollers 7, 7 a is connected to the cam disc 6 by means of a compression spring 8 pressed, each compression spring 8 in a receptacle 9 provided in the hub 5 lies and is supported there on the face.

Auf der den Druckrollen 7,7a gegenüber liegenden Seite sind in der Nabe 5 Gleitrollen 10 drehbar gelagert, wozu der Nabe 5 angepaßte Ausnehmungen 14 vorgesehen sind und wobei die Gleitrollen 10 an der Wandung des Gehäuses 1, die durch eine eingepreßte Buchse 11 gebildet wird, anliegen.On the side opposite the pressure rollers 7, 7 a, 5 sliding rollers 10 can be rotated in the hub stored, for which the hub 5 adapted recesses 14 are provided and the sliding rollers 10 on the wall of the housing 1, which is pressed in by a Bushing 11 is formed.

Anstelle der Gleitrollen 10 können auch ein oder mehrere aus einem geeigneten Material mit niedrigem Reibungskoeffizienten bestehende Gleitstücke vorgesehen sein, die in der Nabe 5 ein- und an der Wandung des Gehäuses 1 anliegen und im Bremsfalls für eine Abstützung der Nabe 5 sorgen.Instead of the sliding rollers 10, one or more of a suitable one can also be used Material with low friction coefficient existing sliders provided be in the hub 5 and rest on the wall of the housing 1 and in If the brakes are applied, support the hub 5.

Im vorliegenden Ausführungsbeispiel sind drei Gleitrollen 10 vorgesehen, die in gleichem Winkelabstand, vorzugsweis unter einem Winkel von 60°, zueinander stehen.In the present embodiment, three casters 10 are provided, which are the same Angle distance, preferably at an angle of 60 ° to each other.

Die Sicherheitskurbel in dem gezeigten Beispiel ist sowohl für eine Rechts- als auch für eine Linksbedienung geeignet. Dabei wird bei Betätigung des Kurbelarmes 3 der angeschlossene Mitnehmer 4, je nach Drehrichtung, entweder gegen die die Druckrolle 7 oder gegen die Druckrolle 7a gedrückt, wobei die zugeordnete Druckfeder 8 in die Aufnahme 9 gepreßt wird, so daß die Druckrolle 7,7a an der Nabe anliegt und diese und mit ihr die eingesteckte Abtriebswelle dreht.The safety crank in the example shown is for a right as well suitable for left-hand operation. When the crank arm 3 is actuated connected driver 4, depending on the direction of rotation, either against the pressure roller 7 or pressed against the pressure roller 7a, the associated compression spring 8 in the receptacle 9 is pressed so that the pressure roller 7,7a abuts on the hub and this and with it the inserted output shaft rotates.

Bei einer notwendigen Bremsung, bei der der Mitnehmer 4 außer Eingriff ist und die Nabe 5 aufgrund der an der Abtriebswelle hängenden Last zurücktreten, dreht sich die Kurvenscheibe 6 unter Festklemmung im Sinne eines Verkeilens gegen die andere Druckrolle 7, wodurch die Nabe 5 gebremst wird.When braking is required, in which the driver 4 is disengaged and the Hub 5 withdraw due to the load hanging on the output shaft, rotates the cam 6 with clamping in the sense of wedging against the other pressure roller 7, whereby the hub 5 is braked.

Zum Lösen der Nabe 5 bzw. der Bremswirkung wird der Kurbelarm 3 entgegengesetzt gedreht, wobei der Mitnehmer mittelbar, wie im vorliegenden Ausführungsbeispiel, oder unmittelbar an der Nabe anliegt.To release the hub 5 or the braking effect, the crank arm 3 is opposed rotated, the driver indirectly, as in the present embodiment, or rests directly on the hub.

Anstelle zweier Druckrollen 7,7a, die eine Rechts-Links-Betätigung der Sicherheitskurbel ermöglichen, kann auch lediglich eine Druckrolle 7 oder 7a vorgesehen sein, so daß ein Betätigen lediglich in einer Richtung möglich ist.Instead of two pressure rollers 7,7a, a right-left actuation of the safety crank enable, only one pressure roller 7 or 7a can also be provided, so that actuation is only possible in one direction.

In diesem Fall liegt, wie bereits erwähnt, bei Betätigung des Kurbelarmes 3 der Mitnehmer 4 unmittelbar an der Nabe an, während die Druckrolle 7 oder 7a auf die andere Seite des Mitnehmers 4 angedrückt wird. In this case, as already mentioned, the driver is located when the crank arm 3 is actuated 4 directly on the hub while the pressure roller 7 or 7a on the other side of the driver 4 is pressed.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Gehäusecasing
22
Lascheflap
33
Kurbelarmcrank
44
Mitnehmertakeaway
55
Nabehub
66
Kurvenscheibecam
77
Druckrollepressure roller
7a7a
Druckrollepressure roller
88th
Druckfedercompression spring
99
Aufnahmeadmission
1010
Gleitrollecaster
1111
BuchseRifle
1212
Sicherungsringcirclip
1313
Bohrungdrilling
1414
Ausnehmungrecess

Claims (1)

  1. A safety crank comprising a housing (1), which is fixable at the building-side to be secure against rotation, and a hub (5), which is arranged therein, connected with a driven shaft and disposed in operative connection with a drive shaft by way of an entrainer (4) and which is fixable relative to the housing (1) by means of a brake device, wherein provided between the hub (5) and the housing wall is at least one roller body at which the entrainer (4) is supported on actuation of the drive shaft, wherein the hub (5) is formed as a cam disc (6) in the region of contact with the respective roller body and wherein the smallest spacing of the cam disc (6) from the housing wall is smaller and its largest spacing equal to or slightly greater than the diameter of the roller body, characterised in that each roller body bears in spring-loaded manner against the cam disc (6) and that slide members (10), which bear against the wall of the housing, are arranged in the hub (5).
EP97112004A 1996-08-20 1997-07-15 Safety crank Expired - Lifetime EP0825147B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19633432A DE19633432A1 (en) 1996-08-20 1996-08-20 Safety crank
DE19633432 1996-08-20

Publications (3)

Publication Number Publication Date
EP0825147A2 EP0825147A2 (en) 1998-02-25
EP0825147A3 EP0825147A3 (en) 1998-12-02
EP0825147B1 true EP0825147B1 (en) 2002-08-28

Family

ID=7803048

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97112004A Expired - Lifetime EP0825147B1 (en) 1996-08-20 1997-07-15 Safety crank

Country Status (6)

Country Link
EP (1) EP0825147B1 (en)
AT (1) ATE222881T1 (en)
CZ (1) CZ289708B6 (en)
DE (2) DE19633432A1 (en)
PL (1) PL183322B1 (en)
SK (1) SK283445B6 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ306859B6 (en) * 2008-03-25 2017-08-16 Sicon S.R.O. A construction element for joining of load-bearing and carried structures
PL234340B1 (en) * 2018-03-08 2020-02-28 Inst Techniki Gorniczej Komag Mechanical brake with the possibility of two-directional starting movement of a drive shaft

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE162122C (en) *
FR1091122A (en) * 1954-01-04 1955-04-07 Fixator Ets Winch safety device
DE1794912U (en) * 1959-05-27 1959-09-03 Thun Alfred & Co Gmbh SAFETY PIVOTS WITHOUT LOCKING LIFTS FOR LIFTING EQUIPMENT AND THE LIKE.
DE29500936U1 (en) * 1995-01-21 1995-03-02 Hase, Geb. Schwager, Anke, 22880 Wedel Lock

Also Published As

Publication number Publication date
PL183322B1 (en) 2002-06-28
SK283445B6 (en) 2003-07-01
CZ256597A3 (en) 1998-03-18
ATE222881T1 (en) 2002-09-15
EP0825147A2 (en) 1998-02-25
DE59708048D1 (en) 2002-10-02
DE19633432A1 (en) 1998-02-26
PL321401A1 (en) 1998-03-02
CZ289708B6 (en) 2002-03-13
EP0825147A3 (en) 1998-12-02
SK107097A3 (en) 1998-03-04

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