| (19) |
 |
|
(11) |
EP 0 379 744 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
27.02.1991 Bulletin 1991/09 |
| (43) |
Date of publication A2: |
|
01.08.1990 Bulletin 1990/31 |
| (22) |
Date of filing: 16.11.1989 |
|
| (51) |
International Patent Classification (IPC)5: B24B 33/04 |
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT |
| (30) |
Priority: |
26.01.1989 GB 8901740
|
| (71) |
Applicant: BURWELL, REED AND KINGHORN LIMITED |
|
Leeds
West Yorkshire LS27 7LB (GB) |
|
| (72) |
Inventor: |
|
- Parkin, J.P.
Gildersome
Leeds LS27 7LB (GB)
|
| (74) |
Representative: Wharton, Peter Robert et al |
|
Urquhart-Dykes & Lord
Inventions House
Valley Court, Canal Road
Bradford BD1 4SP
Bradford BD1 4SP (GB) |
|
| |
|
(57) A polishing machine for mould plungers which comprises means (26) for mounting a
plunger (28) and rotating it, at least one means (30) for bringing a polishing head
(34) into contact with the plunger surface to be polished, and means (22) for relatively
traversing the plunger and the polishing head with respect to one another whereby
to effect longitudinal polishing. The means for bringing the head into contact with
the surface is a fluid operated cylinder (30) whereby to the head pressure is maintained
substantially constant, e.g. by means of a pressure regulator connected in the outlet
or exhaust of the cylinder.