Traversing hoists – Having vertically swinging boom – Having means to swing boom vertically
Patent
1986-03-07
1987-09-01
Nase, Jeffrey V.
Traversing hoists
Having vertically swinging boom
Having means to swing boom vertically
212268, 212269, 52118, B66C 2306
Patent
active
046902902
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION AND PRIOR ART
This invention relates to a device for providing relative movement between at least three movably co-ordinated parts, comprising power means at least partly arranged externally of the parts, said power means being of a type variable in length and acting between a point on a first and a point on a second of the parts, and at least one at least partly flexible traction element extending between a point on the third part and a point fixed in relation to the first part and being arranged to cause relative movement between on one hand the third part and on the other hand said first and second parts by transmitting forces between the first and the third parts when relative movement between the first and second parts is effected by the power means, said traction element having a portion located externally of the parts when the parts are extended relative to each other.
Particularly, the invention relates to a telescopical co-ordination of the three parts. The device is primarily intended to be applied for obtaining a possibility of extension at a lifting crane, where the first part may constitute a pivotable arm of the crane while the third part has means for grasping/carrying an arbitrary load at the outer end.
A device of the kind defined in the introduction is previously known by FI-B 44842. However, this device has the draw back that the flexible traction element is uncovered externally of the parts. This causes a less successful result as regards the appearance and causes also the draw back that the traction element is exposed for contaminations and outer damages. It would be possible to arrange special proctection components for covering the exposed part of the chain but this would then cause increased expenses.
BRIEF DESCRIPTION OF THE INVENTION
The object of this invention is to devise a way to provide a casing for the portion of the flexible traction element lying externally of the parts in a practical and elegant way regarding the construction.
According to the invention this object is achieved in that said portion of the traction element located externally of the parts is received in a longitudinal internal passage in the power means variable in length, which thereby acts as a casing variable in length for said portion of the traction element.
Besides the advantage that the power means itself will function as a casing for the traction element, the advantage that the traction force will be transmitted centrally relative to the power means and via its connections is achieved. In an embodiment of the power means as a piston cylinder mechanism the arrangement of the inner passage in the mechanism will also lead to a relatively far-reaching uniformity what concerns the necessary pressure fluid volumes for obtaining a contraction of the mechanism as great as an expansion of the mechanism, whereby the velocity at the expansion and the contraction of the mechanism will be relatively alike. Further one achieves a compact embodiment by reception of the traction element within the power means.
BRIEF DESCRIPTION OF DRAWINGS
Referring to the appended drawings, below follows a closer description of an embodiment of the invention cited as an example.
In the drawings:
FIG. 1 is a partly cut view from the side of the device according to the invention, and
FIG. 2 is a longitudinal section of the power means of the device, viewed by itself along the line II--II in FIG. 1.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
The device illustrated in the drawings is intended for achieving a relative movement between at least three movably co-ordinated parts 1, 2, 3. These parts are preferably telescopically coordinated. Particularly, the second part 2 is received within the first part 1 while the third part 3 is received in the second part 2. In the example the parts 1-3 are intended to be included in a lifting crane and form an extensible outer arm to said crane while the outer end of the part 3 carries means 4 for connection of an arbitrary load. More exactly the part 1 presents means
REFERENCES:
patent: 3836011 (1974-09-01), Sakamoto et al.
patent: 4156331 (1979-05-01), Lester et al.
patent: 4258853 (1981-03-01), Gill et al.
patent: 4388033 (1983-06-01), Pipes
patent: 4436476 (1984-03-01), Yoritomi
patent: 4575976 (1986-03-01), McDermott et al.
AB Tico
Avila Stephen P.
Drucker William A.
Nase Jeffrey V.
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