AT64411B - Hoist with luffing boom. - Google Patents

Hoist with luffing boom.

Info

Publication number
AT64411B
AT64411B AT64411DA AT64411B AT 64411 B AT64411 B AT 64411B AT 64411D A AT64411D A AT 64411DA AT 64411 B AT64411 B AT 64411B
Authority
AT
Austria
Prior art keywords
boom
inner end
hoist
length
tie rod
Prior art date
Application number
Other languages
German (de)
Inventor
Alfred Hillyard Mitchell
Original Assignee
Alfred Hillyard Mitchell
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 Alfred Hillyard Mitchell filed Critical Alfred Hillyard Mitchell
Application granted granted Critical
Publication of AT64411B publication Critical patent/AT64411B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
    • B66C23/08—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths
    • B66C23/10—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths the paths being substantially horizontal; Level-luffing jib-cranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0307—Cranes in which it is essential that the load is moving horizontally during the luffing movement of the arm or jib

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Description

  

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 beiden äussersten Endlagen des Auslegers, so dass sich also die am   Hubseil h   hängende Last während der Wippbewegung des Auslegers stets in einer horizontalen Ebene bewegen wird und daher zur Ausführung dieser Bewegung lediglich die Reibungsarbeit zu   überwinden   ist, da zur Aufrechterhaltung des Gleichgewichts keine Arbeit zu leisten ist. 



   Es ist also klar, dass beim Wippen des Auslegers dessen Kopf sich in vertikaler Richtung um den gleichen Betrag heben wird, um den sich das innere Ende nach abwärts bewegt hat. Daraus folgt aber, dass sich dabei der geometrische Mittelpunkt des Auslegers weder gehoben noch gesenkt, sondern in wagerechter Ebene bewegt hat. Da nun, wie erwähnt, der Schwerpunkt mit dem geometrischen Mittelpunkt des Auslegers zusammenfällt, so befindet sich der Ausleger in allen Lagen im Gleichgewichtszustande, ob nun am Hubseil eine Last hängt oder nicht. 



   Von den angegebenen   Längenverhältnissen   des Auslegers und der Zugstange c kann natürlich im einzelnen praktischen Fall auch abgewichen werden, entsprechend den verschiedenen Arbeitbedingungen, vor allem entsprechend der Art der Führung des Hubseiles über die Rollen   f und g.   Es ist selbstverständlich, dass auch noch andere als die angegebenen Mittel zur Betätigung des Hub-und Wippseiles verwendet werden   können.   



   PATENT-ANSPRÜCHE :
1. Hebezeug mit wippbarem Ausleger, bei dessen Verstellung die Last annähernd horizontal geführt wird, dadurch gekennzeichnet, dass auch der Schwerpunkt des Auslegers während des Wippens des letzteren annähernd in gleicher Höhe über dem Boden bewegt wird.



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 two extreme end positions of the boom, so that the load hanging on the hoist rope will always move in a horizontal plane during the luffing movement of the boom and therefore only the friction work has to be overcome to carry out this movement, since no work has to be done to maintain the balance is.



   It is therefore clear that when the boom is luffed, its head will rise in the vertical direction by the same amount that the inner end has moved downwards. From this it follows, however, that the geometric center of the boom has neither raised nor lowered, but moved in a horizontal plane. Since, as mentioned, the center of gravity coincides with the geometric center of the boom, the boom is in a state of equilibrium in all positions, regardless of whether a load is hanging on the hoist rope or not.



   The specified length ratios of the boom and the tie rod c can of course also be deviated from in individual practical cases, according to the different working conditions, especially according to the type of guidance of the hoist rope over the rollers f and g. It goes without saying that other means than those specified for actuating the lifting and luffing rope can also be used.



   PATENT CLAIMS:
1. Hoist with a luffing boom, when the load is adjusted approximately horizontally, characterized in that the center of gravity of the boom is moved approximately at the same height above the ground during the luffing of the latter.

Claims (1)

2. Hebezeug nach Anspruch 1, dadurch gekennzeichnet, dass der Schwerpunkt des Auslegers mit dessen geometrischen Mittelpunkt zusammenfällt und der Ausleger derart bewegt u ird, dass sich der Auslegerkopf um soviel hebt, wie sich das innere Ende des Auslegers senkt und umgekehrt. 2. Hoist according to claim 1, characterized in that the center of gravity of the boom coincides with its geometric center and the boom is moved in such a way that the boom head is raised by as much as the inner end of the boom lowers and vice versa. 3. HcbezMug nach Anspruch 1, bei welchem der Ausleger mittels einer Zugstange oder dgl. an der Kransäule angelenkt und mit seinem unteren Ende an der Säule senkrecht geführt ist, dadurch gekennzeichnet, dass die Zugstange (c) den vierten Teil der Länge des Auslegers (a) besitzt und an dem Ausleger in einem Punkte (b) angelenkt ist, der die ganze Auslegerlänge von innen nach aussen im Verhältnis 1 : 3 teilt. 3. HcbezMug according to claim 1, in which the boom is articulated to the crane column by means of a tie rod or the like and is guided vertically with its lower end on the column, characterized in that the tie rod (c) the fourth part of the length of the boom ( a) and is hinged to the boom at a point (b) that divides the entire boom length from the inside to the outside in a ratio of 1: 3. 4. Hebezeug nach Anspruch 3, dadurch gekennzeichnet, dass der Ausleger am inneren Ende mit einer Rolle (g) versehen ist, über welche das Hubseil (h) geführt ist. so dass die Länge des Teiles zwischen der Rolle (g) und einem unterhalb dieser angeordneten ortsfesten Punkt durch Heben oder Senken des inneren Auslegerendes vergrössert bzw. verkleinert werden kann. 4. Lifting device according to claim 3, characterized in that the boom is provided at the inner end with a roller (g) over which the hoisting rope (h) is guided. so that the length of the part between the roller (g) and a fixed point arranged below it can be increased or decreased by raising or lowering the inner end of the boom.
AT64411D 1911-09-12 1912-07-16 Hoist with luffing boom. AT64411B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191120267T 1911-09-12

Publications (1)

Publication Number Publication Date
AT64411B true AT64411B (en) 1914-04-10

Family

ID=32566875

Family Applications (1)

Application Number Title Priority Date Filing Date
AT64411D AT64411B (en) 1911-09-12 1912-07-16 Hoist with luffing boom.

Country Status (3)

Country Link
AT (1) AT64411B (en)
GB (1) GB191120267A (en)
NL (1) NL87C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927965A (en) * 2009-06-26 2010-12-29 吴文发 Right triangle amplitude compensation device

Also Published As

Publication number Publication date
GB191120267A (en) 1912-09-12
NL87C (en) 1914-01-02

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