Mold apparatus and method

• US 6,634,410 B1
• Filed: 08/28/2001
• Issued: 10/21/2003
• Est. Priority Date: 08/28/2001
• Status: Expired due to Fees

• Current Assignee: John H. Wilson, John Thomas Wilson, Robert E. Wilson
• Original Assignee: John H. Wilson, John Thomas Wilson, Robert E. Wilson
• Inventors: Wilson, Robert E., Wilson, John T., Wilson, John H.
• Primary Examiner(s): Elve, M. Alexandra
• Assistant Examiner(s): MCHENRY, KEVIN L
• Application Number:
  US09/941,054
• Time in Patent Office: 784 Days
• Field of Search: 164/45, 164/35, 164/516, 164/7.1, 164/7.2, 164/160.1, 164/160.2, 264/227, 264/221, 264/225, 264/226
• US Class Current: 164/35
• CPC Class Codes: B22C 7/02 Lost patterns
• CPC Class Codes: B22C 9/24 for hollow articles

Abstract

A mold apparatus and method for creating designs on the interior of molds includes a resilient form with an exterior and an interior, with a design formed on the exterior. A rigid support member is removably attached to the interior of the resilient form. A mold pattern, conformed to removably receive the rigid support member and the resilient form in combination, completes the basic elements of the invention. In one aspect of the invention, a passageway in the rigid support member is provided for introducing a gas between the rigid support member and the resilient form. In another aspect of the invention, a vacuum application device is provided for applying a vacuum to the interior of the resilient form. The apparatus and method also provide for the simultaneous creation of designs on the interior and exterior of molds

Claims

1. An apparatus for creating designs on an interior of a mold, the apparatus comprising:

a) a resilient form with an exterior and an interior, with a design formed on the exterior wherein said exterior has no draft angle and said interior has a draft angle;

b) a rigid support member removably attached to the interior of said resilient form; and

c) a mold pattern conformed to removably receive said rigid support member and said resilient form in combination.

2. The apparatus of claim 1 further comprising a passageway in said rigid support member for introducing a gas between said rigid support member and said resilient form.

3. The apparatus of claim 1 wherein said design is a three dimensional design.

4. The apparatus of claim 1 further comprising a vacuum application means for applying a vacuum to said resilient form.

5. The apparatus of claim 4 wherein said vacuum application means has a draft angle.

6. The apparatus of claim 4 wherein said vacuum application means further comprises a plurality of extensions conformed to create a draft angle.

7. The apparatus of claim 1 further comprising a lubricant between said resilient form and said rigid support member.

8. An apparatus for creating designs on the interior and exterior of a mold, the apparatus comprising:

a) a first resilient form with an exterior and an interior, with a design on said interior;

b) a rigid base conformed to removably receive the exterior of said first resilient form;

c) a second resilient form with an exterior and an interior, with a design on said exterior;

d) a rigid support member removably attached to the interior of said second resilient form; and

e) said rigid base and said interior of said first resilient form conformed to removably receive said rigid support member and said second resilient form in combination.

9. The apparatus of claim 8 wherein said interior of said first resilient form and said exterior of said second resilient form have no draft angle.

10. An apparatus for creating complex designs on an interior of investment cast cases, the apparatus comprising:

a) a flexible sleeve with an exterior with a three dimensional design and no draft angle and an interior with a draft angle and a closed end and an open end;

b) a support core conformed to just receive and support the interior of the flexible sleeve from the closed end to the open end; and

c) a mold pattern conformed to releasably receive the support core and flexible sleeve in combination.

11. The apparatus of claim 10 further comprising a passageway in the support core conformed to introduce gas at the closed end of the flexible sleeve.

13. The apparatus of claim 10 wherein said interior has no draft angle.

14. The apparatus of claim 10 further comprising lubricant between the flexible sleeve and the support core.

12. The apparatus of claim further comprising a vacuum applicator.

15. An apparatus for creating complex designs, including undercuts, notches, grooves, counter bores, slots, dimples and bosses, on an interior and an exterior of a mold, the apparatus comprising:

a) a first flexible sleeve with an exterior with a draft angle and an interior with a complex design and no draft angle and a closed end and an open end;

b) a rigid base conformed to removably receive the exterior of said first flexible sleeve;

c) a second flexible sleeve with an exterior with a complex design and no draft angle and an interior with a draft angle and a closed end and an open end;

d) a support core conformed to just receive and support the interior of the second flexible sleeve from the closed end to the open end; and

e) said first flexible sleeve conformed to removably receive said support core and said second flexible sleeve in combination.

16. A method of creating a design on the inside of a mold, the method comprising the steps of:

a) creating a resilient form with an exterior with a design and an interior, wherein said exterior has no draft angle and said interior has a draft angle;

b) attaching a rigid support member to the interior of said resilient form;

c) creating a mold pattern conformed to removably receive said resilient form and said rigid support member in combination;

d) inserting said resilient form and said rigid support member in combination in said mold pattern;

e) adding mold material to said mold pattern;

f) removing said rigid support; and

g) removing said resilient form from said mold pattern.

17. The method of claim 16 further comprising the steps of:

a) providing a passageway in said rigid support member conformed to introdu gas between said rigid support member and said resilient form; and

b) after step e) introducing gas in said passageway.

18. The method of claim 16 further comprising the steps of:

a) providing a vacuum application means;

b) after step f) inserting said vacuum application means within said interior of said resilient form in said mold pattern;

c) applying a vacuum to said resilient form so as to collapse said resilient form around said vacuum application means; and

d) removing said vacuum application means and said resilient form from said mold pattern.

19. The method of claim 16 further comprising the step of adding lubricant between said resilient form and said rigid support member.

20. A method of creating a design on the inside and outside of a mold, the method comprising the steps of:

a) creating a first resilient form with an exterior and an interior, with a design on the interior;

b) holding the exterior of said first resilient form within a rigid base;

c) creating a second resilient form with an exterior with a design and an interior;

d) attaching a rigid support member to the interior of said second resilient form;

e) inserting said second resilient form and said rigid support member in combination within the interior of said first resilient form;

f) adding mold material between the interior of said first resilient form and the exterior of said second resilient form;

g) removing the rigid base from the first resilient form;

h) removing the first resilient form from the mold material;

i) removing the rigid support member from the second resilient form; and

j) removing said second resilient form from the mold pattern.

21. A method for forming an investment cast case with a three dimensional design on the interior of the case, the method comprising the steps of:

a) creating a master pattern of the three dimensional design in a female receiver;

b) creating a male rigid support core with a draft angle, conformed to fit within the female receiver and including a passageway for introducing gas;

c) sealing the passageway with a removable pin so that the male rigid support core is a solid form;

d) inserting the male rigid support core into the female receiver and introducing a flexible material forming fluid into the female receiver between the female receiver and the male rigid support core;

e) allowing the flexible material forming fluid to cure and create a flexible sleeve with a three dimensional design on an exterior and an interior conformed exactly to the male rigid support core;

f) removing the removable pin and blowing compressed gas into the passageway so that gas is introduced between the rigid support core and the flexible sleeve;

g) removing the flexible sleeve from the master pattern female receiver;

h) inserting the male rigid support core within the interior of the flexible sleeve;

i) inserting the flexible sleeve and rigid support core in combination within a mold pattern conformed to form the exterior of a case;

j) adding wax to the interior of the mold pattern and allowing the wax to harden;

k) removing the hardened wax and the combination of the flexible sleeve and the rigid support core from the mold pattern;

l) introducing gas into the passageway and removing the rigid support core;

m) removing the flexible sleeve from the hardened wax; and

n) creating a case with three dimensional designs on the inside of the case from the hardened wax by means of a lost wax process.

22. The method of claim 21 further comprising the steps of:

a) creating a vacuum applicator;

b) after step

     1) inserting the vacuum applicator within the flexible sleeve;

c) applying a vacuum to the inside of the flexible sleeve with the vacuum applicator so that the flexible sleeve is pulled away from the hardened wax; and

d) removing the vacuum applicator in combination with the flexible sleeve from the hardened wax.

23. The method of claim 22 further comprising the step of forming the vacuum applicator with a draft angle.

24. An apparatus for creating designs on an interior of a mold, the apparatus comprising:

a) a resilient form with an exterior and an interior, with a design formed on the exterior;

b) a rigid support member removably attached to the interior of said resilient form;

c) a mold pattern conformed to removably receive said rigid support member and said resilient form in combination; and

d) a vacuum application means for applying a vacuum to said resilient form

wherein said vacuum application means further comprises a plurality of extensions conformed to create a draft angle.

25. An apparatus for creating complex designs on an interior of an investment cast case, the apparatus comprising:

a) a flexible sleeve with an exterior with a three dimensional design and no draft angle and an interior with a draft angle and a closed end and an open end;

b) a support core conformed to just receive and support the interior of the flexible sleeve from the closed end to the open end;

c) a mold pattern conformed to releasably receive the support core and flexible sleeve in combination; and

d) a passageway in the support core conformed to introduce gas at the closed end of the flexible sleeve.