Mechanisms to automate removal of aligner from mold

Patent metadata

Field	Value
Publication number	US-11420362-B2
Application number	US-201916662929-A
Country	US
Kind code	B2
Filing date	Oct 24, 2019
Priority date	Oct 31, 2018
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

Embodiments relate to automating removal of an untrimmed shell from a mold. In one embodiment, a shell removal device includes a body and a platform disposed within the body. The platform is configured to secure a mold that has an untrimmed shell formed over the mold. The shell removal device further includes a cover configured to secure the untrimmed shell to an upper surface of one or more sidewalls of the body and provide a seal between a lower surface of the untrimmed shell and the upper surface of the one or more sidewalls of the body. The shell removal device may include a media inlet in the body to permit pressurized media into the interior of the body to cause a pressure differential between an upper surface of the untrimmed shell and the lower surface of the untrimmed shell to cause the untrimmed shell to release from the mold.

First claim

What is claimed is:

1. A shell removal device comprising:
a body comprising one or more sidewalls that enclose an interior of the body;
a platform disposed within the interior of the body, wherein the platform is configured to secure a mold that has an untrimmed shell formed over the mold, and wherein one or more portions of the untrimmed shell are to extend over the one or more sidewalls of the body;
a cover configured to secure the untrimmed shell to an upper surface of the one or more sidewalls of the body and provide a seal between a lower surface of the untrimmed shell and the upper surface of the one or more sidewalls of the body;
a media inlet in the body to permit pressurized media into the interior of the body to cause a pressure differential between an upper surface of the untrimmed shell and the lower surface of the untrimmed shell, wherein the pressure differential causes the untrimmed shell to expand and release from the mold;
a drive mechanism to move the platform away from the untrimmed shell during the pressure differential to cause the mold to separate from the untrimmed shell; and
a sensor to provide sensor data indicative that the untrimmed shell has begun to separate from the mold to trigger the drive mechanism.

2. The shell removal device of claim 1 , wherein the mold corresponds to a dental arch of a patient and the untrimmed shell is an untrimmed aligner.

3. The shell removal device of claim 1 , further comprising:
an O-ring on the upper surface of the one or more sidewalls of the body; and
a clamping mechanism to press the cover against the one or more portions of the untrimmed shell that extend over the one or more sidewalls of the body and to further press the one or more portions of the untrimmed shell against the O-ring on the upper surface of the one or more sidewalls of the body to create the seal.

4. The shell removal device of claim 1 , further comprising:
one or more pads attached to an inner side of the cover, wherein the one or more pads are positioned to press against one or more flat regions of the untrimmed shell that do not cover the mold to prevent damage of the untrimmed shell during application of the pressure differential.

5. The shell removal device of claim 1 , further comprising:
a media outlet in the cover to permit media to be removed from an area defined by the cover and the upper surface of the untrimmed shell to cause a negative pressure above the untrimmed shell.

6. The shell removal device of claim 1 , wherein:
the body is a hollow cylindrical body;
the platform comprises a cylinder; and
the cover comprises a ring having a first diameter that approximately matches a second diameter of the hollow cylindrical body.

7. The shell removal device of claim 1 , further comprising:
one or more pumps to force the pressurized media through the media inlet into the interior of the body and cause the pressure differential between the upper surface of the untrimmed shell and the lower surface of the untrimmed shell.

8. A method comprising:
securing a mold to a platform of a shell removal device, wherein an untrimmed shell has been formed over the mold, wherein a body of the shell removal device comprises one or more sidewalls that enclose an interior of the body, wherein the platform is disposed within the interior of the body, and wherein sides of the untrimmed shell extend over the one or more sidewalls of the body;
securing the untrimmed shell between a lower surface of a cover and an upper surface of the one or more sidewalls of the body to provide a seal between at least one of a lower surface of the untrimmed shell and the upper surface of the one or more sidewalls of the body or an upper surface of the untrimmed shell and the lower surface of the cover;
performing at least one of pumping a pressurized media into the interior of the body or pumping media out of an area defined by the cover and the upper surface of the untrimmed shell to cause a pressure differential between the upper surface of the untrimmed shell and the lower surface of the untrimmed shell;
causing the untrimmed shell to expand and release from the mold based on the pressure differentials;
detecting, via a sensor of the shell removal device, that the untrimmed shell has begun to separate from the mold; and
triggering a drive mechanism to begin moving the platform away from the untrimmed shell responsive to the detecting that the untrimmed shell has begun to separate from the mold.

9. The method of claim 8 , further comprising:
pressing one or more pads attached to an inner side of the cover against one or more flat regions of the untrimmed shell that do not cover the mold; and
preventing the one or more flat regions of the untrimmed shell from deforming during application of the pressure differential using the one or more pads.

10. The method of claim 8 , further comprising:
moving, via the drive mechanism of the shell removal device, the platform away from the untrimmed shell during the pressure differential to cause the mold to separate from the untrimmed shell.

11. The method of claim 8 , wherein pumping the pressurized media into the interior of the body comprises pumping air into the interior of the body to a pressure of about 5 to 30 pounds per square inch (psi).

12. The method of claim 8 , wherein the mold corresponds to a dental arch of a patient, wherein the mold comprises a sloping portion that commences below a gum line of the dental arch and extends away from the dental arch to a lower portion of the mold, wherein a portion of the untrimmed shell that is disposed on the sloping portion of the mold is to be trimmed.

13. The method of claim 8 , further comprising:
trimming the untrimmed shell to generate an aligner subsequent to release, via the shell removal device, of the untrimmed shell from the mold.

14. A shell removal device comprising:
a body comprising one or more sidewalls that enclose an interior of the body;
a platform disposed within the interior of the body, wherein the platform is configured to secure a mold that has an untrimmed shell formed over the mold, and wherein one or more portions of the untrimmed shell are to extend over the one or more sidewalls of the body;
a cover configured to secure the untrimmed shell to an upper surface of the one or more sidewalls of the body and provide a seal between an upper surface of the untrimmed shell and a lower surface of the cover;
a media outlet in the cover to permit media to be removed from an area defined by the cover and the upper surface of the untrimmed shell to cause a pressure differential between the upper surface of the untrimmed shell and the lower surface of the untrimmed shell, wherein the pressure differential causes the untrimmed shell to release from the mold;
a drive mechanism to move the platform away from the untrimmed shell during the pressure differential to cause the mold to separate from the untrimmed shell; and
a sensor to provide sensor data indicative that the untrimmed shell has begun to separate from the mold to trigger the drive mechanism.

15. The shell removal device of claim 14 , further comprising:
an O-ring on the lower surface of the cover; and
a clamping mechanism to press the cover against the one or more portions of the untrimmed shell that extend over the one or more sidewalls of the body and to further press the one or more portions of the untrimmed shell against the O-ring on the lower surface of the cover to create the seal.

16. The shell removal device of claim 14 , further comprising:
one or more pads attached to an inner side o

Assignees

• Align Technology Inc

Inventors

• Mojdeh Mehdi
• Sambu Shiva P
• McNAMARA Dennis

Classifications

• B29C51/46

  Measuring, controlling or regulating · CPC title

• B29L2031/753

  Medical equipment; Accessories therefor (bloodbags, medical bags B29L2031/7148; artificial eyes B29L2011/0008) · CPC title

• B29C51/268

  Cutting, rearranging and joining the cut parts · CPC title

• B29C33/0038

  with sealing means or the like (seals on envelopes used in tyre retreading B29D30/542; for injection moulding footwear B29D35/0045) · CPC title

• B29D11/00192

  Demoulding, e.g. separating lenses from mould halves · CPC title