Claims
- 1. A process for the manufacture of a piston and cylinder assembly comprising the steps of:
- providing a mold having a surface corresponding to the outside surface of the cylinder to be cast;
- positioning within said mold cores having shapes corresponding to spaces in the cylinder to be cast, with selected cores which define spaces to be connected spaced apart a predetermined distance;
- introducing casting material into said mold to form a cylinder casting having a thin film between said selected cores;
- removing said casting from said mold and said cores from said casting;
- and mechanically removing said thin film to form openings between said spaces previously separated by said thin film to connect said spaces.
- 2. A process according to claim 1 wherein said thin film is mechanically removed by stamping.
- 3. A process according to claim 1 wherein said thin film is mechanically removed by machining.
- 4. A process according to claim 1 wherein portions of said thin film are mechanically removed by machining and further portions of said thin film are removed by stamping.
- 5. A process according to claim 1 wherein said casting material is selected from the group consisting of pressure die casting starting material, squeeze die casting starting material, and other fluid, semifluid, semisolid, or pasty starting material.
- 6. A process according to claim 1 wherein said casting material is semisolid metal starting material.
- 7. A process according to claim 1 wherein said piston and cylinder assembly is a master cylinder and push rod piston combination.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3835383 |
Oct 1986 |
DEX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/422,792 filed Oct. 18, 1989, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0192445 |
Aug 1989 |
JPX |
2123103 |
Jan 1984 |
GBX |
2150869 |
Jul 1985 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Websters Ninth New Collegiate Dictionary, definitions of the words "Film", Floating and Membrane, 1984, pp. 463; 473-474, and 740. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
422792 |
Oct 1989 |
|