| (19) |
 |
|
(11) |
EP 0 353 661 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
28.11.1990 Bulletin 1990/48 |
| (43) |
Date of publication A2: |
|
07.02.1990 Bulletin 1990/06 |
| (22) |
Date of filing: 28.07.1989 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB |
| (30) |
Priority: |
01.08.1988 US 225877
|
| (71) |
Applicant: BESSER COMPANY |
|
Alpena
Michigan 49707 (US) |
|
| (72) |
Inventor: |
|
- Wallace, Mark P.
Alpena
Michigan 49707 (US)
|
| (74) |
Representative: Tetzner, Volkmar, Dr.-Ing. Dr. jur. |
|
Van-Gogh-Strasse 3
81479 München
81479 München (DE) |
|
| |
|
| (54) |
Concrete block molding machine having continuously driven vibrating shaft mechanism
which can be programmably vibrated and method of programmably vibrating such machines |
(57) A cement block molding machine has a vibratible mold box incorporating at least one
molding cavity for a cement mixture which is to be densified in the cavity. A continuously
driven shaft (15) assembly mounts an eccentric fixed portion and a circumferentially
adjustable balancing mass. The shaft assembly (5) has a cylinder (c) with a piston
(26) therein, connected to the mass (25a) to produce rotary motion of the mass (25a)
relative to the fixed eccentric portion (18, 19). A spring (28) of predetermined rate
opposes this. The pressure of the fluid introduced is varied to change the amplitude
of the vibration imparted during each cycle.