# US 4,396,133 A · Wax cylinder > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,396,133 A - Document ID: US4396133A - Status: Granted - Kind: A - Application number: 06/307,302 - Filed: 1981-09-30 - Granted: 1983-08-02 - Earliest claimed: 1980-10-13 - Assignees: Thyssen Industrie AG - Inventors: Georg Glaser - Web page: https://patentgrep.com/patent/US4396133A ## CPC - B29C 45/53: using injection ram or piston - B29C 67/241: {Moulding wax} - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) ## Abstract A wax cylinder for a wax spraying machine is disclosed. The wax cylinder includes a housing, an ejection cylinder having a chamber mounted in the housing. An elongated piston is slidably mounted in the chamber and includes a pressure face for pressurizing and urging wax in the chamber out through an ejection opening. The chamber is maintained in constant fluid communication with a feed line for feeding wax into the chamber throughout the stroke of the piston. A check valve is utilized to prevent back flow of wax through the feed line. Air is prevented from flowing into the chamber during the return stroke of the piston. ## Claims ### Claim 1 A wax cylinder for a wax spraying machine comprising a housing, an ejection cylinder having a chamber mounted in said housing, an elongated piston slidably mounted in said chamber of said ejection cylinder and having a pressure face, said piston having a longitudinal groove extending therealong and a feed passage extending therethrough from a first end connected to said groove to a second open end in said pressure face for communication with said ejection cylinder chamber, feed line means communicating with said longitudinal groove for passing wax in a feed direction through the housing and the ejection cylinder to said longitudinal groove, a check valve in said feed line means for preventing the return flow of wax opposite the feed direction, means for preventing the rotation of said piston relative to said ejection cylinder in said chamber, means for ejecting wax from said chamber, and means for actuating longitudinal movement of said piston in said chamber to urge said pressure face into engagement with the wax in said chamber, said pressure face being operative responsive to said actuating movement to pressurize the wax for ejection through said ejecting means. ### Claim 2 (depends on 1) A wax cylinder as set forth in claim 1, wherein said displacement piston is mounted in an overhung position. ### Claim 3 (depends on 1, 2) A wax cylinder as set forth in claims 1 or 2, wherein said actuating means comprises a hydraulic cylinder having a stroke, the stroke being of a length equal to the length of said ejection cylinder, and wherein said longitudinal groove has a length equal to the stroke length, and said longitudinal groove being in fluid communication with said feed line means throughout the total displacement of said piston. ### Claim 4 (depends on 3) A wax cylinder as set forth in claim 3, wherein said rotation locking means comprises a rod connected to said housing and extending into a guide opening in said piston. ### Claim 5 (depends on 1) A wax cylinder as set forth in claim 1, further comprising piston rings sealingly engaging said piston to said ejection cylinder at opposite ends of said piston, said piston rings being located on said piston such that said feed line means is communicated with said longitudinal groove at a position intermediate said piston rings through the total displacement of said piston. ### Claim 6 (depends on 2) A wax cylinder as set forth in claim 2, further comprising piston rings sealingly engaging said piston to said ejection cylinder at opposite ends of said piston, said piston rings being located on said piston such that said feed line means is communicated with said longitudinal groove at a position intermediate said piston rings through the total displacement of said piston. ### Claim 7 (depends on 3) A wax cylinder as set forth in claim 3, further comprising piston rings sealingly engaging said piston to said ejection cylinder at opposite ends of said piston, said piston rings being located on said piston such that said feed line means is communicated with said longitudinal groove at a position intermediate said piston rings through the total displacement of said piston. ### Claim 8 (depends on 4) A wax cylinder as set forth in claim 4, further comprising piston rings sealingly engaging said piston to said ejection cylinder at opposite ends of said piston, said piston rings being located on said piston such that said feed line means is communicated with said longitudinal groove at a position intermediate said piston rings through the total displacement of said piston. ### Claim 9 (depends on 2) A wax cylinder as set forth in claim 2, wherein said actuating means comprises a hydraulic cylinder having a stroke, the stroke being of a length equal to the length of said ejection cylinder, and wherein said longitudinal groove has a length equal to the stroke length, and said longitudinal groove being in fluid communication with said feed line means throughout the total displacement of said piston. ### Claim 10 (depends on 9) A wax cylinder as set forth in claim 9, further comprising piston rings sealingly engaging said piston to said ejection cylinder at opposite ends of said piston, said piston rings being located on said piston such that said feed line means is communicated with said longitudinal groove at a position intermediate said piston rings through the total displacement of said piston. ### Claim 11 (depends on 10) A wax cylinder as set forth in claim 10, wherein said longitudinal groove is formed on the outer surface of said piston.