# US 5,197,335 A · Apparatus for inspecting mechanical strength of bottom portions of bottom-closed hollow pipes

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- Number: US 5,197,335 A
- Document ID: US5197335A
- Status: Granted
- Kind: A
- Application number: 07/685,144
- Filed: 1991-04-15
- Granted: 1993-03-30
- Earliest claimed: 1990-04-21
- Assignees: NGK Insulators, Ltd.
- Inventors: Satoru Yamada; Koji Tanaka
- Web page: https://patentgrep.com/patent/US5197335A

## CPC

- G01N 3/04: Chucks
- G01N 3/10: generated by pneumatic or hydraulic pressure (G01N3/18 takes precedence)
- G01N 33/0078: {Testing material properties on manufactured objects}
- G01N 33/388: {Ceramics}
- G01N 2203/0067: Fracture or rupture
- G01N 2203/0274: Tubular or ring-shaped specimens
- G01N 2203/0452: Cushioning layer between test piece and grip
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A bottom strength-inspecting apparatus for bottom-closed hollow pipes is disclosed. This apparatus includes an air chuck 2 for holding an outer peripheral surface of the bottom-closed hollow pipe W, and a pressing elements coaxially provided with the air such as elastic pressing element 8 adapted to contact a bottom surface 9 of the bottom-closed hollow pipe W from an axially outer side of the hollow pipe and press the bottom surface by given forces.

## Claims

### Claim 1

A bottom strength-inspecting system for bottom-closed hollow pipes, said system comprising:
an air chuck for holding an outer peripheral surface of the bottom-closed hollow pipe;
pressing means longitudinally coaxially provided with the air chuck, said pressing means provided for contacting a bottom surface of the bottom-closed hollow pipe and for pressing the bottom surface by given forces, said pressing means including an elastic pressing element; and
a load cell for detecting the forces by which the pressing means press the bottom surface of the bottom-closed hollow pipe.

### Claim 2

A bottom strength-inspecting system for bottom-closed hollow pipes, said system comprising;
an air chuck for holding an outer peripheral surface of the bottom-closed hollow pipe;
pressing means longitudinally coaxially provided with the air chuck, said pressing means provided for contacting a bottom surface of the bottom-closed hollow pipe and for pressing the bottom surface by given forces, said pressing means comprising:
(a) an air cylinder;
(b) a pressing rod fitted to the air cylinder at one end; and
(c) an elastic pressing element attached to the other end of the pressing rod, wherein the air cylinder is actuated to make said elastic pressing element press the bottom surface of the hollow pipe by said given forces.