Excavating – Railway graders – Side former
Patent
1983-01-10
1984-06-19
Eickholt, E. H.
Excavating
Railway graders
Side former
4146958, E02F 522
Patent
active
044546653
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement for equipment mounted on excavating machines and the like, such as excavator buckets, where the equipment is supported on an attachment provided for fastening purposes on the machine arm, by means of a shaft in such a way that the equipment can be rotated in the said shaft in relation to the attachment.
BACKGROUND
With machines for excavation and building works, such as excavating machines, tractors and the like carrying equipment, occasionally the need arises to forcibly rotate the equipment. If the rotation does not for example need to be greater than one quarter of a turn, the rotation can be performed with hydraulic servocylinders which are well known and are suitable force devices for such machines. Occasionally however further rotation is required, up to even a complete turn. This is the case particularly when working in tunnels or on steep slopes or walls, because it may be necessary to excavate or to lever both upwards, downwards and sideways.
TECHNICAL PROBLEM
When rotating equipment through angles which are not much less than half a turn, difficulties are encountered in bringing about rotation by means of an hydraulic cylinder which operates against a lever arm. Hence it has been necessary to resort to other solutions and it has proved difficult to find servo devices which in this sphere can replace the hydraulic cylinder. Rotating motors of different types require gearboxes and during the severe operating conditions encountered with equipment of this type these are highly stressed and at the same time are subjected to an unfavourable environment with considerable dirt and wetness. Hence, unless extremely advanced, robust constructions are employed, such arrangements have proved to have a short service life and low operational reliability and in many cases the difficulties have had to be accepted and arrangements have been employed in which rotation through larger angles is carried out by manual rotation after certain connections have been released.
THE SOLUTION
The solution in accordance with the invention involves the attachment for the equipment having a spigot which is located eccentrically in relation to the shaft and the equipment is provided with a spigot located at some distance from the said rotating shaft, where a first link is swivel mounted at the spigot on the attachment and a second link is swivel mounted at the spigot on the equipment. The links are swivel mounted to each other at the ends which are not mounted on the said spigots, the first link having a projecting portion, the end of which is attached at the said spigot and which is arranged to penetrate to the rear of the said shaft so that a larger rotational angle in the direction concerned is achieved before the link as a whole makes contact with the shaft.
ADVANTAGES
The invention provides a rotating arrangement for excavating machines and the like by means of which a rotational angle of at least almost a complete turn can be obtained without the aid of any rotating motor.
BRIEF DESCRIPTION OF DRAWINGS
Two embodiments of the invention are described in the following and illustrated in the appended drawings.
FIG. 1 gives a side view which relates to both embodiments;
FIG. 2-7 illustrate different working positions of the arrangement in accordance with the first embodiment in a section along the line VI--VI and in six different working positions (the position in FIG. 1 corresponds approximately with the position in FIG. 6), and
FIG. 8-10 illustrate the second embodiment in a corresponding section.
BEST MODE OF CARRYING OUT THE INVENTION
FIG. 1 illustrates by means of continuous lines, in side view, an excavator bucket 1. This is arranged to be carried by an arm 2, denoted by dash-dotted lines on an excavating machine or the like. The bucket 1 is combined with the arm 2 by means of a shaft 3 and an attachment point 4 for a link system 5 so that the bucket can be swivelled through different angles in relation to the arm by means of an hydraulic ser
REFERENCES:
patent: 3758941 (1973-09-01), Jackson et al.
patent: 4236857 (1980-12-01), Willi
patent: 4332094 (1982-06-01), Mieger
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