Waste container and related method of manufacture

• US 8,173,057 B2
• Filed: 05/01/2009
• Issued: 05/08/2012
• Est. Priority Date: 05/01/2009
• Status: Active Grant

• Current Assignee: Cascade Engineering Incorporated
• Original Assignee: Cascade Engineering Incorporated
• Inventors: Parker, Brian G., Rugg, Paul J.
• Primary Examiner(s): Del Sole, Joseph
• Assistant Examiner(s): STEWART, KIMBERLY ANN
• Application Number:
  US12/434,115
• Publication Number:
  US 20100276839A1
• Time in Patent Office: 1,103 Days
• Field of Search: 264/318, 264/299, 425/DIG.58, 425/438, 425/443, 425/556, 249/58
• US Class Current: 264/318
• CPC Class Codes: B29C 45/4407 by flexible movement of undercut portions of the articles
• CPC Class Codes: B29L 2031/7126 large, e.g. for bulk storage
• CPC Class Codes: B65F 1/1484 relating to the adaptation of receptacles to carry identification means

Abstract

A method of forming a container includes providing a mold including at least one bulbous protrusion. The mold is closed to form a mold cavity corresponding to the shape of the container, with the bulbous protrusion being positioned in the mold cavity. Material is injected into the mold cavity to form the container, and the material envelopes the bulbous protrusion to create an undercut slot. The container is removed from the mold and the bulbous protrusion is withdrawn from the slot.

Claims

1. A method of forming a complete container, the method comprising:

providing a mold having a first mold half and a second mold half movable relative one another along a single direction of travel, the first mold half including a bulbous protrusion generally aligned with the single direction of travel;

closing the mold by moving the first and second mold halves relative one another along the single direction of travel to form a mold cavity corresponding to the shape of the complete container, wherein the bulbous protrusion is in the mold cavity;

injecting a material into the mold cavity to form the complete container, wherein the material envelopes the bulbous protrusion to create a slot having an undercut portion;

opening the mold by moving the first and second mold halves relative one another along the single direction of travel, the material staying on the second mold half, the opening step including withdrawing the bulbous protrusion from the slot along the single direction of travel; and

removing the complete container from the second mold half.

2. The method of claim 1 further comprising allowing the material to harden in the mold to form the complete container, wherein the material tightens against the bulbous protrusion as it hardens and creates a gap in the mold.

3. The method of claim 2 wherein the bulbous protrusion and the slot each include a head portion, a narrow neck portion and a body portion, wherein withdrawing the bulbous protrusion from the slot includes withdrawing the head of the bulbous protrusion through the neck portion of the slot.

4. The method of claim 3 wherein the withdrawing step results in flexing the neck portion of the slot.

5. The method of claim 4 further comprising snapping an object into the slot in the complete container.

6. The method of claim 5 wherein the object is a case adapted to receive an RFID tag, wherein the method includes placing an RFID chip in the case and snapping the case into the slot.

7. The method of claim 6 wherein the mold is adapted to form a plurality of ribs on the complete container, wherein withdrawing the bulbous protrusion from the slot includes leaving the slot in at least one of the ribs.

8. The method of claim 1 wherein the undercut portion of the slot is in the range of approximately 0.020 to 0.080 inches.

9. The method of claim 8 wherein the undercut portion of the slot is approximately 0.020 inches.

16. The method of claim 3 wherein the slot is key-hole shaped.

10. A method of forming a complete waste container adapted to have an RFID tag attached thereto, the method comprising:

providing a mold having an upper mold half and a lower mold half, the upper and lower mold halves movable relative one another along a single direction of travel, one of the upper and lower mold halves includes a bulbous protrusion generally aligned with the single direction of travel;

closing the upper and lower mold halves along the single direction of travel to form a mold cavity corresponding to the shape of the complete container and with the bulbous protrusion in the mold cavity;

injecting material into the mold cavity to form the complete container, wherein the material envelopes the protrusion to create a slot having a relatively narrow neck;

opening the upper and lower mold halves along the single direction of travel, the material remaining on the other of the upper and lower mold halves, the opening step including withdrawing the bulbous protrusion from the slot along the single direction of travel; and

removing the complete container from the other mold half.

11. The method of claim 10 wherein the bulbous protrusion and the slot each include a head portion, a narrow neck portion and a body portion, wherein withdrawing the bulbous protrusion from the slot includes the neck portion of the slot flexing to accommodate the head of the bulbous protrusion.

12. The method of claim 11 wherein the mold is adapted to form a plurality of ribs on the complete container, wherein withdrawing the bulbous protrusion from the slot includes leaving the slot in at least one of the ribs.

13. The method of claim 10 wherein the neck portion of the slot is in the range of approximately 0.040 to 0.160 inches narrower than the width of the bulbous protrusion.

14. The method of claim 13 wherein the neck portion of the slot is approximately 0.040 inches narrower than the width of the bulbous protrusion.

15. The method of claim 10 further comprising snapping a case including an RFID tag into the slot.

17. The method of claim 11 wherein the slot is key-hole shaped.