Eccentric dowel pin and pin-adjusted structure in hole type modular tooling systems

• US 4,997,303 A
• Filed: 02/28/1989
• Issued: 03/05/1991
• Est. Priority Date: 09/01/1988
• Status: Expired due to Fees

• Current Assignee: China National Aerotechnology Import and Export Corporation, Qing-Yang Machine Works
• Original Assignee: China National Aerotechnology Import and Export Corporation, Qing-Yang Machine Works
• Inventors: Xu, Changxiang, Yu, Qiulin, Zhuo, Ruixing
• Primary Examiner(s): KUNDRAT, ANDREW
• Application Number:
  US07/316,816
• Time in Patent Office: 735 Days
• Field of Search: 403/4, 403/409.1, 403/3
• US Class Current: 403/4
• CPC Class Codes: B23Q 1/4804 a single rotating pair followed perpendicularly by a single sliding pair
• CPC Class Codes: B23Q 1/5468 a single rotating pair followed parallelly by a single rotating pair
• CPC Class Codes: Y10T 403/76 having a cam, wedge, or tapered portion

Abstract

A set of eccentric dowel pins and a pin-adjusted structure can move interlocking features of a hole type modular tooling system directly and continuously along axes without rigging and indicating, and thus provide full flexibility to such a hole type modular tooling system.

Claims

1. An adjustment assembly for hole-type modular tooling systems, comprising a set of eccentric dowel pins each having a first cylindrical portion of a greater diameter, a prism formed on the top of said first portion and having a width B, and a second cylindrical portion of a smaller diameter provided on the top of said prism, said first and second cylindrical portions being eccentrical with respect to each other on a symmetrical central plane of said prism wherein the eccentricity between said first and second cylindrical portion can be changed from 0 to Emax in a predetermined increment depending on an eccentric dowel pin of said set used in the assembly;

an pin-adjusting structure including two apertures of a diameter corresponding to that of said second cylindrical portion and spaced from each other at a distance W, a keyway formed in a bottom of said structure and having a width corresponding to that of said prism, and a pair of counter and through slots formed between said two apertures;

a key pin including a pin portion and a prism portion on the top of said pin portion; and

a plate including two holes spaced rom each other at a distance L and each being of a diameter corresponding to that of said first cylindrical portion and said pin portion, wherein assembly said first cylindrical portion fits in one of said holes, said second cylindrical portion fits in one of said apertures of said structure, said prism of a dowel point fits in said keyway, and said pin portion of said key pin fits in another of said holes and said prism portion of said key pin fits in the keyway of said structure so that said key pin is used as a tenon to restrict an adjusting direction.

2. The assembly according to claim 1, wherein a serial eccentricity E of eccentric dowel pins in the set is in 0.05 mm increments and is equal to 0, 0.05, 0.10 . . . , 3.05, 3.10 and 3.15 mm.

3. The assembly according to claim 1, wherein the a value 4 Emax is at least equal to a fourth of said distance L and said distance W is at least equal to the distance L minus 2 Emax.