Molded article and manufacturing method for same

Patent metadata

Field	Value
Publication number	US-11241807-B2
Application number	US-201716337311-A
Country	US
Kind code	B2
Filing date	Sep 28, 2017
Priority date	Sep 28, 2016
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

The purpose of the present invention is to provide a molded article and a manufacturing method for a molded article by which it is possible to mitigate deformation of an opening. The present invention provides a molded article comprising a cylindrical base and an opening provided in the base, wherein a rib is provided adjacent to the opening. The present invention provides a manufacturing method for a molded article that includes a molded body formation step for forming a molded body having a cylindrical portion provided at one end thereof with an occlusion by molding a melted resin, and a cut-off step for cutting off the occlusion by cutting the cylindrical portion, wherein in the cut-off step, the cutting is performed in a state where a side wall of the cylindrical portion is warped in-plane by an external force.

First claim

The invention claimed is:

1. A molded article, comprising a tubular base portion and an opening portion disposed in the tubular base portion,
wherein the tubular base portion has a base wall, a first side wall, a second side wall and an opposite wall,
wherein a peripheral edge of the opening portion has a pair of long-side portion opposite to each other and a pair of short-side portions disposed to be connected to the pair of long-side portion, and
wherein multiple V-groove-shaped first ribs are disposed at edges of the opening portion, along the long-side portion on a side of the first side wall and along the pair of short-side portions.

2. The molded article according to claim 1 , wherein a second rib is disposed between a parting line of the molded article and the opening portion.

3. The molded article according to claim 2 , wherein when a distance between the parting line of the molded article and the opening portion is set to be L1 and a length of a side wall of the second rib is set to be L2, wherein L2/L1 is 0.5 or more.

4. The molded article according to claim 2 , wherein the side wall of the second rib is disposed to be connected to the parting line.

5. The molded article according to claim 2 , wherein the second rib is disposed such that a depth of the second rib is increasing along with the second rib being extending away from the opening portion.

6. The molded article according to claim 2 , wherein when a depth of a deepest portion of the second rib is set to be D and a thickness of a bottom wall of the second rib is set to be T, wherein D/T is 2 or more.

7. The molded article according to claim 1 , wherein the molded article comprises a beam rib disposed along the peripheral edge of the opening portion, and
the beam rib is disposed between a parting line of the molded article and the opening portion.

8. The molded article according to claim 7 , wherein the multiple V-groove-shaped first ribs are disposed to be connected to the beam rib.

9. The molded article according to claim 7 , wherein the beam rib is constituted by a groove-shaped concave portion disposed along the peripheral edge.

10. The molded article according to claim 9 , wherein the multiple V-groove-shaped first ribs are disposed within the groove-shaped concave portion.

11. The molded article according to claim 2 , wherein the second rib is disposed at a center of the long-side portion.

12. The molded article according to claim 1 , wherein the molded article is a foamed molded article.

13. A method of manufacturing the molded article according to claim 1 , comprising a molded body formation step and a cut-off step,
wherein in the molded body formation step, a molded body is formed by molding a molten resin, wherein the molded body comprises a tubular base portion, a tubular portion disposed in such a manner as to be erected from the base portion, and the multiple V-groove-shaped first ribs are disposed at the edges of the tubular portion, and a closure portion is disposed at one end of the tubular portion, and
in the cut-off step, the closure portion is cut off by cutting the tubular portion to form an opening portion.

Assignees

• Kyoraku Co Ltd

Inventors

• Onodera Masaaki
• Kano Naoya
• Matsubara Yoshitaka
• Fujii Motoharu

Classifications

• B29C49/04112

  for varying the thickness · CPC title

• B29C49/42394

  Providing specific wall thickness · CPC title

• B29C48/09

  Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels · CPC title

• B29C48/388

  using a screw extruder and a ram or piston · CPC title

• B26F1/0053 Primary

  by machining, e.g. cutting, grinding, projections on the tube wall · CPC title