Joint molding apparatus

Patent metadata

Field	Value
Publication number	US-9751256-B2
Application number	US-201414159009-A
Country	US
Kind code	B2
Filing date	Jan 20, 2014
Priority date	Jan 20, 2014
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A joint molding apparatus for molding joints between composite panels comprising inflatable molding bladders connectable to a source of pressurized fluid. A bladder support structure supports the bladders in respective positions adjacent an intersection of panels where, when inflated, the bladders support a joint formed at the intersection of panels while an uncured portion of the joint is curing to hold the joint in a desired configuration at the panel intersection.

First claim

What is claimed is:

1. A joint molding apparatus for molding a joint at a panel intersection, the apparatus comprising:
four inflatable molding bladders connectable to a source of pressurized fluid; and
a bladder support structure that supports the bladders in respective positions adjacent an intersection of panels where, when inflated, the bladders support a joint formed at the intersection of panels while an uncured portion of the joint is curing to hold the joint in a desired configuration at the panel intersection, the bladder support structure including:
backing members arranged to brace the bladders against outward movement and cause the bladders to expand inwardly against respective corresponding portions of the joint; and
two end caps that engage and retain opposite ends of the backing members against outward movement away from the joint;

the bladder support structure being configured to support the four bladders in respective panel joint quadrants where, when inflated, the bladders apply radially inwardly-directed pressure to the joint from each joint quadrant while the uncured portion of the joint is curing.

2. A joint molding apparatus as defined in claim 1 in which the bladder support structure is configured to support the bladders such that bladder inflation applies pressure to the joint.

3. A joint molding apparatus as defined in claim 1 in which the bladder support structure includes at least one holding rod extending axially between and releasably connecting the two end caps.

4. A joint molding apparatus as defined in claim 1 in which each bladder includes an embedded silicone rubber flexible heater configured to provide heat sufficient to cure the composite resin.

5. A joint molding apparatus as defined in claim 1 in which the bladders include respective expandable sealing regions configured to fill and seal gaps between the backing members and the panels, and to prevent uncured resin from escaping from the joints through the gaps.

6. A joint molding apparatus as defined in claim 1 , further including a semi-rigid reinforcement insertable between each bladder and the joint, each reinforcement having a stiffer presentation than the bladder and shaped to provide desired joint contours.

7. A joint molding apparatus for molding a joint at a panel intersection, the apparatus comprising:
at least two inflatable molding bladders connectable to a source of pressurized fluid; and
a bladder support structure that supports the bladders in respective positions adjacent an intersection of panels where, when inflated, the bladders support a joint formed at the intersection of panels while an uncured portion of the joint is curing to hold the joint in a desired configuration at the panel intersection, the bladder support structure including:
backing members arranged to brace the bladders against outward movement and cause the bladders to expand inwardly against respective corresponding portions of the joint, and
two end caps that engage and retain opposite ends of the backing members against outward movement away from the joint;

the bladders being configured to support, when inflated, a Pi joint at the panel intersection while an uncured composite resin portion of the Pi joint is curing to hold the Pi joint in a desired configuration at the panel intersection.

8. A joint molding apparatus as defined in claim 7 in which the bladder support structure is configured to support the bladders such that bladder inflation applies pressure to the joint.

9. A joint molding apparatus as defined in claim 7 in which the bladder support structure includes at least one holding rod extending axially between and releasably connecting the two end caps.

10. A joint molding apparatus as defined in claim 7 in which each bladder includes an embedded silicone rubber flexible heater configured to provide heat sufficient to cure the composite resin.

11. A joint molding apparatus as defined in claim 7 in which the bladders include respective expandable sealing regions configured to fill and seal gaps between the backing members and the panels, and to prevent uncured resin from escaping from the joints through the gaps.

12. A joint molding apparatus as defined in claim 7 , further including a semi-rigid reinforcement insertable between each bladder and the joint, each reinforcement having a stiffer presentation than the bladder and shaped to provide desired joint contours.

Assignees

• Lockheed Corp

Inventors

• Zivich William Peter
• Norris Ashley J
• Swain Matthew Grant

Classifications

• B29C66/324

  Avoiding burr formation · CPC title

• B29C66/81455

  being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic pressure (inflatable element positioned between the joining tool and a backing-up part B29C66/82421) · CPC title

• B29C65/7802

  Positioning the parts to be joined, e.g. aligning, indexing or centring · CPC title

• B29C66/112

  Single lapped joints · CPC title

• B29C66/721

  Fibre-reinforced materials (B29C66/729 takes precedence) · CPC title