Extension jib for a boom
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 9, 1989
Issued Date -
N/A
app pub date -
Oct 5, 1988
filing date -
Jul 21, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A retractable extension jib for a telescopic boom has frame body rotatably mounted on an end of the boom so as to be rotated about a rotary axis, a horizontal shaft provided at a lower portion of the frame body and rotatably connecting a base portion of the extension jib. A pair of oil hydraulic cylinders are provided between a base portion of the extension jib and an upper portion of the frame body so as to rotate the jib about the horizontal shaft. The hydraulic cylinders are so arranged as to rotate the extension jib from a retracted position to a lower position where a longitudinal axis of the jib is substantially parallel with the rotary axis.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully