EP0825147B1 - Safety crank - Google Patents
Safety crank Download PDFInfo
- 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
Links
Images
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
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.
- 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
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
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
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
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
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
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
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
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
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
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
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
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
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
- 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)
- 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).
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)
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)
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 |
-
1996
- 1996-08-20 DE DE19633432A patent/DE19633432A1/en not_active Ceased
-
1997
- 1997-07-15 DE DE59708048T patent/DE59708048D1/en not_active Expired - Lifetime
- 1997-07-15 EP EP97112004A patent/EP0825147B1/en not_active Expired - Lifetime
- 1997-07-15 AT AT97112004T patent/ATE222881T1/en active
- 1997-07-30 PL PL97321401A patent/PL183322B1/en unknown
- 1997-08-07 SK SK1070-97A patent/SK283445B6/en not_active IP Right Cessation
- 1997-08-12 CZ CZ19972565A patent/CZ289708B6/en not_active IP Right Cessation
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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