Container restraint release

• US 4,555,133 A
• Filed: 12/27/1983
• Issued: 11/26/1985
• Est. Priority Date: 12/27/1983
• Status: Expired due to Term

• Current Assignee: Mcdonnell Douglas Corporation (The Boeing Co.)
• Original Assignee: Mcdonnell Douglas Corporation (The Boeing Co.)
• Inventors: Lively, Lewell M. Jr., Danielsen, Donald P.
• Primary Examiner(s): Marbert, James B.
• Application Number:
  US06/565,640
• Time in Patent Office: 700 Days
• Field of Search: 294/83 R, 294/83 A, 294/84, 294/82 R, 294/66, 294/104, 24/241 P, 24/230 AP, 244/137 R, 244/151 B, 89/1.56
• US Class Current: 294/82.24
• CPC Class Codes: B66C 1/38 adapted for automatic disengagement from loads on release of cable tensions for parachutes B64D17/00

Abstract

A release/restraint mechanism for air-dropped cargo interposed between fixed aircraft structure and the restraining webbing. A fixed arm is oriented opposite a pivoted arm which is fixed in one position and free to rotate in the release position. A restraint arm is pivoted at one end of the fixed arm and engages a cam on the pivoted arm. The pivoted arm is angled about the pivot point so as to provide a side load on the end pivoted arm so as to open the restraint arm when in the release position, freeing the cargo for a gravity air drop.

Claims

1. A retainer/release mechanism for air dropped cargo restrained by straps comprising:

a frame;

a fixed arm attached to said frame;

a release arm, having first and second ends, pivotally attached to said frame at a point intermediate said first and second ends and having a cam mating surface near said second end and oriented generally opposite and spaced from said fixed arm;

means to restrain and release said release arm;

a restraint arm, adapted to receive said strap, pivotally attached at one end of said fixed arm and having the free end terminating in a cam surface which engages said cam mating surface on said release arm when said release arm is restrained so as to bridge between said fixed arm and said release arm and not engage said cam mating surface when said release arm is released; and

means to provide a side load on said second end of said release arm tending to rotate said second end of said release arm away from said fixed arm.

2. The retainer/release mechanism of claim 1 wherein the end of said frame opposite said restraint arm is provided with a hook for attachment restraint.

3. The retainer/release mechanism of claim 1 wherein said means to restrain and release said release arm is a fulcrum rod supported in said frame so as to permit axial translation between a closed position wherein said first end of said release arm engages said fulcrum rod so as to restrain said release arm and an open position wherein said first end of said release arm is unrestrained by said fulcrum rod and free to rotate about said pivot and release said restraint arm.

4. The retainer/release mechanism of claim 1 wherein said means to provide a side load on said second end of said release arm tending to rotate said second end of said release arm away from said fixed arm is directly proportional to the trans-axial tension load applied to said restraint arm.

5. The retainer/release mechanism of claim 3 further comprising a solenoid attached to said frame, wherein said fulcrum rod is attached to the armature of said solenoid and translates from the closed position to the open position by energizing said solenoid.

6. The retainer/release mechanism of claim 5 further comprising a linkage means attached to said frame and attached to said fulcrum rod so as to manually move said fulcrum rod whereby said retainer/release mechanism may be released either manually or remotely by energizing said solenoid.

7. The retainer/release mechanism of claim 3 wherein said means to provide a side load on said second end of said release arm is provided by angling said ends of said release arm about said pivot point so that an axial tension load applied at said second end of said release arm provides said side load tending to rotate said second end of said release arm away from said fixed arm.

8. A retainer/release mechanism for air drop of cargo, comprising:

a frame;

a fulcrum rod supported in said frame so as to permit axial translation between an open position and a closed position;

a fixed arm oriented generally parallel to the translation axis of said fulcrum rod and attached to said frame;

a release arm having first and second ends, pivotally attached to said frame at a point intermediate said first and second ends, and oriented generally opposite said fixed arm and having one end engage said fulcrum rod when said rod is in the closed position and not engage said rod when said rod is in the open position;

means to impose a side load at said second end of said release arm tending to rotate said second end away from said fixed arm when a generally axial tension load is applied to said release arm; and

a restraint arm pivotally attached at one end of said fixed arm and having the free end terminating in a cam surface which engages said second end of said release arm so as to bridge between said fixed arm and said release arm when said fulcrum rod is in said closed position and said cam surface does not engage said second end of said release arm when said fulcrum rod is in said open position, all with the application of a generally axial tension load applied to said release arm.

9. The retainer/release mechanism of claim 8 wherein said means to provide a side load on said second end of said release arm tending to rotate said second end of said release arm away from said fixed arm is directly proportional to the trans-axial tension load applied to said restraint arm.

10. The retainer/release mechanism of claim 8 wherein said means to provide a side load on said second end of said release arm is provided by angling said ends of said release arm about said pivot point so that an axial tension load applied at said second end of said release arm provides said side load tending to rotate said second end of said release arm away from said fixed arm.

11. The retainer/release mechanism of claim 10 further comprising a solenoid attached to said frame, Wherein said fulcrum rod is attached to the armature of said solenoid and translates from the closed position to the open position by energizing said solenoid.

12. The retainer/release mechanism of claim 11 further comprising a linkage means attached to said frame and attached to said fulcrum rod so as to manually move said fulcrum rod whereby said retainer/release mechanism may be released either manually or remotely by energizing said solenoid.