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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/171479
Kind Code:
Provided is a crane which allows counterweight mounting work to be carried out with a ladder stably engaged with the upperstructure. This crane comprises: an upperstructure 2 that is rotatably provided on an undercarriage 1; a counterweight 10 that is mounted on the upperstructure 2; and a ladder 13 for getting on and off a work platform 12 for the upperstructure 2. The ladder 13 has an engagement member 16 in which an inverted U-shaped engagement groove 16a is formed and a support member 15 that rotatably supports the engagement member 16. The engagement member 16 is formed with an elongated hole 16b into which a pin 19 provided on the support member 15 is inserted. When the upperstructure 2 sinks during the mounting of the counterweight 10, the engagement member 16 rotates and follows the downward movement of an engagement-receiving portion 12b, and thus it is possible to prevent the engagement groove 16a from lifting and coming off from the engagement-receiving portion 12b.

TANIMOTO Shingo (Hitachi Sumitomo Heavy Industries Construction Crane Co. Ltd., 6-1, Asahi-cho, Obu-sh, Aichi 50, 〒4748550, JP)
NG Jacinda (Hitachi Sumitomo Heavy Industries Construction Crane Co. Ltd., 6-1, Asahi-cho, Obu-sh, Aichi 50, 〒4748550, JP)
Application Number:
Publication Date:
September 12, 2019
Filing Date:
March 06, 2018
Export Citation:
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SUMITOMO HEAVY INDUSTRIES CONSTRUCTION CRANES CO., LTD. (9-3 Higashi-Ueno 6-chome, Taito-ku Tokyo, 15, 〒1100015, JP)
International Classes:
B66C15/00; E06C5/02; E06C7/48
Foreign References:
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (UNIZO Nishishimbashi 3-chome Bldg, 13-3 Nishishimbashi 3-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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