# US 5,343,788 A · Hydrodynamic support pump

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- Number: US 5,343,788 A
- Document ID: US5343788A
- Status: Granted
- Kind: A
- Application number: 07/937,262
- Filed: 1992-08-31
- Granted: 1994-09-06
- Earliest claimed: 1992-08-31
- Assignees: Spego, Inc.
- Inventors: Henry E. Goforth
- Web page: https://patentgrep.com/patent/US5343788A

## CPC

- B23B 13/027: {Feeding by pistons under fluid-pressure}
- Y10T 82/2521: Bar feeder
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Apparatus for an automatic bar feeder is given which provides fluid to the space between the barstock and guide tube having a pump integral to the piston pusher to control pressure on the barstock being fed to the machine tool.

## Claims

### Claim 1

In a machine tool having a machine tool spindle for rotating a barstock and a hydraulic barfeed apparatus for feeding the barstock to the machine tool spindle, said hydraulic barfeed apparatus comprising a guide tube containing the barstock with a space therebetween and a piston pusher in the guide tube for pushing the barstock, the improvement comprising a pump disposed in said guide tube driven by the rotation of the barstock to provide fluid to the space between the barstock and the guide tube.

### Claim 2 (depends on 1)

The apparatus of claim 1 wherein said pump is integral with the piston pusher.