Claims
- 1. A timing system for use in the manufacture of a stack mold having a center mold portion and a plurality of moveable mold portions which open and close relative to the center portion, the stack mold being adapted for installation in a mold press having a mold press frame, the system comprising:
a gear assembly for attachment to the center portion of the stack mold; a plurality of racks for slidably mounting to the gear assembly; a plurality of rack spacers each dimensioned for spacing and mounting said plurality of racks to at least one of said plurality of moveable mold portions; and a center support for mounting the center mold portion to the mold press frame.
- 2. The timing system of claim 1 wherein said gear assembly includes an outer housing enclosing the gear assembly.
- 3. The timing system of claim 1 wherein said gear assembly includes a breakaway dowel pin for rotatably mounting a gear wheel within the gear assembly.
- 4. The timing system of claim 3 wherein said gear assembly includes at least one roller bearing for rotatably mounting the gear wheel to the dowel pin.
- 5. The timing system of claim 1 wherein said gear assembly includes a plurality of cam followers rotatably mounted adjacent to the gear wheel for slidably mounting at least one of the plurality of racks between the cam followers and the gear wheel.
- 6. The timing system of claim 1 wherein said gear housing includes a plurality of voids for receipt of mounting bolt for securing the gear assembly to the center portion of the mold.
- 7. The timing system of claim 1 wherein at least one of the plurality of racks are mounted to the moveable mold portions by a breakaway dowel pin.
- 8. The timing system of claim 7 wherein at least one of the plurality of the rack spacers include a pair of U-shaped members for enclosing the rack in a cavity formed therebetween.
- 9. The timing system in accordance with claim 1 wherein the gear assembly includes a plurality of wear pads positioned within the gear assembly for sliding contact with the plurality of racks, at least one of the plurality of wear pads having a coating providing a low co-efficient of friction and good wear resistance.
- 10. The timing system of claim 1 wherein each of the plurality of moveable plates includes a hydraulic actuator to drive movement of an ejector plate.
- 11. The timing system of claim 10 wherein a threadless pin plate coupling having a shoulder for receipt in a retaining slot formed in the ejector plate for connecting the hydraulic actuator with the ejector plate.
- 12. A stack mold for use in an injection molding press having a press frame comprising:
a mold center portion; a center portion support for slidably mounting the mold center portion to the press frame; a gear assembly adapted to mount in a pocket formed in the mold center portion; a plurality of moveable mold portions which open and close relative to center portion, the moveable mold portions and center portions forming a plurality of mold cavities when held in a closed position; a plurality of racks having first and second ends, the first ends of the racks being slidably mounted to the gear assembly, the second end of the racks being mounted to one of the plurality of moveable mold portions; and a plurality of rack spacers for mounting the second end of the plurality of racks to the plurality of moveable mold portions.
- 13. A stack mold in accordance with claim 12 wherein the gear assembly includes an outer housing and a gear wheel rotatably mounted within the gear assembly.
- 14. A stack mold in accordance with claim 13 wherein the gear assembly includes a breakaway dowel pin for rotatably mounting the gear wheel to the gear assembly.
- 15. A stack mold in accordance with claim 12 wherein the gear assembly includes a plurality of wear pads positioned within the gear assembly for sliding contact with the plurality of racks, at least one of the wear pads having a coating providing a low co-efficient of friction and good wear resistance.
- 16. The stack mold of claim 12 wherein each of the plurality of moveable plates includes a hydraulic actuator to drive movement of an ejector plate.
- 17. The stack mold of claim 12 wherein a threadless pin plate coupling having a shoulder for receipt in a retaining slot formed in the ejector plate to connect the hydraulic actuator with the ejector plate.
- 18. The timing system of claim 12 wherein said gear assembly includes a plurality of cam followers rotatably mounted adjacent to the gear wheel for slidably mounting at least one of the plurality of racks between the cam followers and the gear wheel.
- 19. The stack mold of claim 18 wherein the plurality of rack spacers are secured to the moveable mold portions at no more than two opposing corners of the rack spacers and wherein the spacers are adapted to receive a dowel pin which passes through the rack spacer, moveable rack and into the moveable mold portion.
- 20. The stack mold of claim 12 wherein the center portion support is adapted to detachably mount to the center support.
- 21. The stack mold of claim 12 wherein the center support is detachably mounted to the center support by a plurality of threaded bolts and mounted to the press frame by a plurality of detachable tie bar pads.
- 22. A gear assembly for use in a stack mold having a center portion and a plurality of moveable portions, said gear assembly comprising:
an outer housing; a gear wheel rotatably mounted to the outer housing; and a plurality of cam followers spaced apart from said gear wheel and rotatably mounted to said housing.
- 23. The gear assembly of claim 22 further comprising a breakaway dowel pin mounted to the housing for rotatably mounting the gear wheel.
- 24. The gear assembly of claim 23 further comprising at least one roller bearing for rotatably mounting the gear wheel to the breakaway dowel pin.
- 25. The gear assembly of claim 22 wherein the outer housing is adapted to mount in a pocket machined in the center portion of the stack mold.
- 26. The gear assembly of claim 25 wherein the outer housing has a plurality of bores formed therein for receipt of mounting bolts for mounting the gear assembly to the center portion of the stack mold.
- 27. The gear assembly of claim 22 further comprising a plurality of cam followers rotatably mounted adjacent to the gear wheel for slidably mounting at least one of the plurality of racks between the cam followers and the gear wheel.
- 28. The gear assembly in accordance with claim 22 further comprising a plurality of wear pads positioned within the gear assembly for sliding contact with the plurality of racks, at least one of the wear pads having a coating providing a low co-efficient of friction and good wear resistance thereto.
Parent Case Info
[0001] This is a continuation-in-part of U.S. Ser. No. 60/212,247, filed Jun. 19, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60212247 |
Jun 2000 |
US |