Joints and connections – Manually releaseable latch type – Having operating mechanism
Reexamination Certificate
2002-03-08
2004-06-22
Browne, Lynne H. (Department: 3679)
Joints and connections
Manually releaseable latch type
Having operating mechanism
C403S321000, C403S325000, C403S327000, C403S328000, C024S453000, C411S347000
Reexamination Certificate
active
06752562
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to connecting pins that are used to secure two or more objects together.
BACKGROUND OF THE INVENTION
A variety of positive lock pins are well known in the art. Positive lock pins are typically utilized to quickly install a secure connector in a joint or other location to thereby lock two or more objects together.
One known positive lock pin that is widely utilized is generally referred to as a pip-pin. As is known, pip-pins are typically used to lock two or more objects together in applications where a clamping force is not needed. The locking function of these pip-pins is accomplished through the utilization of a protruding ball lock mechanism. As is known, the ball lock mechanism is comprised of a pair of balls that are positioned to communicate with holes in opposing sides of the pip-pins. Each of the pair of balls extends outwardly through a respective hole such that its outermost portion extends beyond the diameter of the pip-pin. In this locked position, the balls prevent the pip-pin from being removed from the hole into which it inserted. To remove the pip-pins, the ball lock mechanism is retracted which allows the pip-pin to be removed from the hole into which it is inserted.
One known application for these pip-pins includes the attachment of Ground Support Equipment together with associated flight hardware. Another known application for these pip-pins is for the International Space Station where they are used to assemble mechanisms and the large truss structures in space. These pip-pins have applications that are both temporary and permanent. In either event, current pip-pins have a reliability problem where the balls, which form part of the locking mechanism, can fall outwardly through the hole and therefore become detached from the pin. Obviously, if the balls fail, the retention capability of the pip-pins is diminished. Furthermore, the loose balls can contaminate critical hardware and may cause malfunction.
One of the principal reasons that the ball mechanisms fail is due to vibrations forces that act on the pip-pins. With current pip-pins, the ball devices are swaged into place to provide a retention mechanism for the pin. Because the ball devices are swaged into the holes from the outside, the large vibration forces that act on the pip-pins, due to the applications in which the pip-pins are employed, can cause the ball devices to fall out of the holes. As is known, the swaging process provides relatively weak retention capabilities. Accordingly, efforts have been made to increase the retention capabilities of these balls, including by increasing the amount of swaging of the ball devices. This increased swaging, however, decreases the amount of retention capability of the pin. This is because, by increasing the amount of swaging, the ball devices protrude out of the pin a lesser distance. This increased swaging further requires the diameter of the hole in which the pip-pin is placed to be machined to tighter tolerances in order to insure retention of the pip-pin in the hole.
Because of the unreliability of these pip-pins, they must be frequently replaced and/or repaired when failed. This increases the cost of the pip-pins as well as the associated service costs. Moreover, if the pip-pins fail altogether, this failure can have a more significant impact on the application in which they are being utilized.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a quick install positive lock pin that provides increased retention capabilities.
It is another object of the present invention to provide a quick install positive lock pin that has improved reliability.
It is still another object of the present invention to provide a quick install positive lock pin that requires less installation time.
It is a further object of the present invention to provide a quick install positive lock pin that allows for easier inspection to determine the propriety of its installation.
In accordance with the above and the other objects of the present invention, a quick install positive lock pin is provided. The positive lock pin is intended to lock a plurality of objects together and includes a handle portion. The handle portion has a handle housing in communication therewith. The handle housing has a shaft member disposed therein, which is reciprocal with respect to the handle housing. The handle housing has at least one retention mechanism disposed therein, which is in communication with a pocket formed in the shaft member. The at least one retention mechanism is pivotable between a locked position and an unlocked position. In the locked position, the at least one retention mechanism extends outwardly from the outer surface of the pin. In the unlocked position, the outermost portion of the at least one retention mechanism is located inwardly of the outer surface of the pin. The at least one retention mechanism is maintained in the locked position by an upwardly spring force. The at least one retention mechanism is moveable to the unlocked position by linear movement of the shaft member with respect to the handle housing. Linear movement of the shaft member causes the spring associated with the at least one retention mechanism to be depressed, which allows the at least one retention mechanism to pivot such that its outermost portion does not extend beyond the outer surface of the pin. The at least one retention mechanism is fixedly secured to the shaft member adjacent the pocket.
Other objects and features of the present invention will become apparent when viewed in light of the detailed description of the preferred embodiment when taken in conjunction with the attached drawings and appended claims.
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Mills John S.
Snyder James M.
Tsui Walter
Artz & Artz PC
Browne Lynne H.
Flandro Ryan M.
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