Title:
A COMPOSITE SCREW STRUCTURE HAVING ELLIPTICAL CROSS-SECTION OF MINOR DIAMETER THEREOF
Document Type and Number:
WIPO Patent Application WO/2002/057639
Kind Code:
A1
Abstract:
A composite screw structure is formed of a left-hand thread and a right-hand thread, in which said two threads of opposite hand are arranged uniformly and their roots cross each other; wherein the cross-section of minor diameter of said composite screw structure is elliptical.
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| WO/2004/048785 | ACCUMULATOR USING INTERNAL AND EXTERNAL THREADS |
Inventors:
TANG ZONG CAI (CN)
TO WO HO (CN)
ZHOU YICHENG (CN)
CHEUNG CHI KI (CN)
TO WO HO (CN)
ZHOU YICHENG (CN)
CHEUNG CHI KI (CN)
Application Number:
PCT/IB2001/000552
Publication Date:
July 25, 2002
Filing Date:
April 03, 2001
Export Citation:
Assignee:
TANG ZONG CAI (CN)
TO WO HO (CN)
ZHOU YICHENG (CN)
CHEUNG CHI KI (CN)
TO WO HO (CN)
ZHOU YICHENG (CN)
CHEUNG CHI KI (CN)
International Classes:
F16B33/02; (IPC1-7): F16B33/02
Foreign References:
| GB2120345A | 1983-11-30 | |||
| DE1675689B1 | 1969-12-18 | |||
| CN2240632Y | 1996-11-20 | |||
| CN2380736Y | 2000-05-31 |
Attorney, Agent or Firm:
LUNG TIN INT'L PATENT & TRADEMARK AGENT LTD. (Tower B, Grand Place 5 Huizhong Road Chaoyang District
Beijing 1, CN)
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