Metal founding – Means lubricating relatively moving and contacting apparatus...
Patent
1979-03-02
1980-07-15
Baldwin, Robert D.
Metal founding
Means lubricating relatively moving and contacting apparatus...
164158, 164162, 188264B, 188322, 277 3, 277 59, 277 74, B22C 1300, B22C 2300
Patent
active
042123453
ABSTRACT:
A device for forming a sprue or vent hole in a foundry sand mold. The device includes a body having a central bore and having an air outlet in the upper end of the body communicating with the bore. An axial opening in the lower end of the body has a smaller diameter than the bore. Mounted for movement within the body is a pin or plunger which has an enlarged head that is slidable within the bore and a lower stem which is slidable within the opening. The pin is urged outwardly of the body by a spring, and a seal is located between the stem portion of the pin and the wall of the body bordering the opening. The pin is formed with an internal passage, one end of which is located at the inner end of the head of the pin and the other end of the passage opens at the side of the stem. As the body is lowered relative to the pin to compress the sand in the flask, the pin will move inwardly of the body against the force of the spring, causing a portion of the air within the bore to exit through the passage and then through the seal to the atmosphere, to thereby dislodge foreign material from the seal. The seal is lubricated by means of a wick which extends into a reservoir of lubricant and terminates along the wall of the bore.
REFERENCES:
patent: 1095356 (1914-05-01), Riel et al.
patent: 1464142 (1923-08-01), Smith
patent: 2155800 (1939-04-01), Perazo
patent: 2275806 (1942-03-01), Perazo
patent: 2908951 (1959-10-01), Melka
Baldwin Robert D.
Batten, Jr. J. Reed
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