24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21)
(22) Date of filing of Application: 13/06/2003 (43)
(54) Title of the invention:
Application No: 601/MUMNP/2003 A
Publication Date: 24/06/2005
THE HYDRAULIC DIFFERENTIAL CYLINDER FOR A DEVICE WITH AT
LEAST ONE EXTENSION ARM OR SUPPORT ARM FOR MULTI-LINKED
CRANE-SHAPED EXTENSION ARMS, CONCRETE SPREADER
COLUMNS AND SIMILAR
(51) International Classification : E 04 G 21/04 (71)
(31) Priority Document No. : 100 64 365.5
(32) Priority Date : 22/12/2000
(33) Name of priority country : GERMANY
(86)
International Application
No.
: PCT/EPO1/15222
Filing Date : 21/12/2001
(87) International Publication
No.
: WO 02/052115 A2
(61) Patent of addition to
Application No.
: NIL
Filed on : N.A.
(62)
(57) Abstract:
Divisional to Application
No.
: NIL
Filed on : N.A.
(72)
Name of the Applicant:
SCHWING GMBH
Address of the Applicant:
HEERSTRASSE 11, 44647 HERNE,
GERMANY.
Name of the Inventors:
1. SIEGFRIED TRUMPER
2. HORST HECKMANN
Filed U/S 5(2) before the
Patents (Amendment)
Ordinance, 2004: NO
The invention relates to a device with at least one extension arm or support arm for multi-linked crane shaped
extension arms, concrete spreader columns and similar, comprising at least one hydraulic differential cylinder for
actuating a support arm. The cylinder comprises a hollow piston rod which has a tubular segment and two end
pieces arranged on the ends of said segment, whereby at least one of the end pieces is welded on to the segment
thereof. The welded joint is machined and the root of the weld is eliminated. At least one of the end pieces
comprises a through opening which enables tool access in order to machine the hollow cavity of the hollow piston
rod.
(FIG.: NIL)
Total Pages: 17.
The Patent Office Journal 24.06.2005 17792