# US 8,739,420 B2 · Machine bed for a co-ordinate measuring machine

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- Number: US 8,739,420 B2
- Document ID: US8739420B2
- Status: Granted
- Kind: B2
- Application number: 12/992,776
- Filed: 2008-05-16
- Published: 2011-12-08
- Granted: 2014-06-03
- Earliest claimed: 2008-05-16
- Assignees: Hexagon Metrology, Inc.
- Applicants: Alberto Tarizzo
- Inventors: Alberto Tarizzo
- Web page: https://patentgrep.com/patent/US8739420B2

## CPC

- G01B 5/0004: {Supports (G01B5/025 takes precedence)}
- G01B 1/00: Measuring instruments characterised by the selection of material therefor
- G01B 5/0016: {due to weight (on machine tools B23Q11/001)}
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

A co-ordinate measuring machine (1) comprising a machine bed (2) provided with guides along a first axis, and a mobile unit (4) comprising at least one main carriage (5) mobile along the guides (16a, 16b, 16c); the machine bed (2) comprises a closed perimetral metal frame (15) provided with guides (16a, 16b, 16c) and a worktable (17) housed within the frame (15); the worktable (17) and the frame (15) are constrained to one another by constraint means (35) that uncouple the deformations thereof.

## Claims

### Claim 1

A co-ordinate measuring machine comprising:
a machine bed defining guide means along a first axis; and
a mobile unit comprising at least one main carriage mobile along said guide means, wherein said machine bed includes a closed perimetral frame provided with said guide means and a worktable at least partially housed within said frame, said worktable and said frame being constrained to one another by constraint means that uncouple deformations thereof, wherein;
said constraint means are statically determined; and
said constraint means comprise a first constraint that eliminates three degrees of freedom, a second constraint that eliminates two degrees of freedom, and a third constraint that eliminates one degree of freedom.

### Claim 2

A co-ordinate measuring machine comprising:
a machine bed defining guide means along a first axis; and
a mobile unit comprising at least one main carriage mobile along said guide means, wherein said machine bed includes a closed perimetral frame provided with said guide means and a worktable at least partially housed within said frame, said worktable and said frame being constrained to one another by constraint means that uncouple deformations thereof, wherein said perimetral frame has a rectangular shape, and is constituted by a plurality of beam elements rigidly connected to one another.

### Claim 3 (depends on 2)

The machine according to claim 2, wherein said constraint means are statically determined.

### Claim 4 (depends on 2)

The machine according to claim 2, wherein translations between the worktable and the frame following upon deformations are negligible, said machine being wherein it comprises a system of statically indeterminate constraint that eliminates the degrees of freedom of translation.

### Claim 5 (depends on 2)

The machine according to claim 2, wherein said worktable is made at least prevalently of a pourable non-metal material.

### Claim 6 (depends on 5)

The machine according to claim 5, wherein said material is concrete.

### Claim 7 (depends on 2)

The machine according to claim 2, wherein said beam elements are metal profiled elements.

### Claim 8 (depends on 7)

The machine according to claim 7, wherein brackets are integral to said frame.

### Claim 9 (depends on 2)

The machine according to claim 2, wherein said beam elements are made of stone material.

### Claim 10 (depends on 9)

The machine according to claim 9, wherein said second material is granite.

### Claim 11 (depends on 2)

The machine according to claim 2, wherein said beam elements are made of a composite material.

### Claim 12 (depends on 2)

The machine according to claim 2, wherein said worktable is supported via said constraint means by supporting brackets rigidly fixed to said frame.

### Claim 13 (depends on 2)

The machine according to claim 2, wherein said worktable is constituted by a top integral portion of a base, said frame being supported by a supporting portion of said base via said constraint means.

### Claim 14 (depends on 2)

The machine according to claim 2, wherein it comprises a top layer made of a second material and defining a working surface of said machine.