Blow tube arrangement for core and mold making machinery
AssigneeRoberts Sinto Corporation
InventorAlbert D. Kluge
Life of this patent
Estimating the term…
Abstract
A blow tube arrangement and method for controlling the flow of granular mold material to the cavity of a mold or core making machine, in which one or more transverse openings are formed in the tip of the blow tube, which allow flow into the cavity when the tip is inserted into the cavity but which are covered as the tip is withdrawn. A spring urged covering sleeve receives the tip as it is withdrawn from the mold pattern structure to maintain closure of the tip openings.
Claims7
In combination with a core/mold pattern making machine, a blow tube arrangement for directing a flow of granular mold material into a cavity in a pattern structure included in said machine, through an entrance bore in said pattern structure, said blow tube arrangement comprising:
- a blow tube having a tip portion slidably fit into said entrance bore;
- a longitudinal passage extending within said blow tube adapted to receive said flow of granular material;
- at least one transverse opening radiating from said longitudinal passage out of said tip portion to direct flow out of said tip portion in a radial direction;
- a covering sleeve slidably fit over said blow tube;
- spring bias means urging said sleeve to move towards said tip portion;
- said sleeve having a bore overlying said transverse opening with said sleeve positioned over said tip portion, whereby upon insertion of said tip portion into said entrance bore, said covering sleeve may be retracted against the force of said bias means to uncover said transverse opening as said blow tube tip portion passes into said entrance bore, said transverse opening remaining covered by said slidable fit of said tip portion in said entrance bore until said tip portion enters into said cavity.
A method of controlling the flow of sand from a blow tube having a tip and into a cavity formed in a pattern structure, the method including the steps of:
- slidably fitting the blow tube into an entrance bore extending into said cavity;
- forming at least one transverse opening in said blow tube radiating out from a longitudinal passage in said blow tube, said transverse opening located at the tip so as to enter said cavity and allow a radial flow of granular mold material into said cavity, said transverse opening covered upon withdrawal of said tip into said entrance bore;
- slidably mounting a covering sleeve on said blow tube out of said pattern structure and receiving said blow tube into said covering sleeve as said blow tube is withdrawn so as to maintain coverage of said transverse opening as said blow tube tip is withdrawn from said entrance bore, whereby maintaining coverage of said at least one transverse opening except when said tip is within said cavity.
Dependencies are inferred from the claim text.