Single-action double-lock snap

US4122585A · kind A · utility

Inventors

• Jonathan Sharp · Sunningdale, GB
• Frank R. Ross · Englewood, US

Key dates

• Filing date: Jul 18, 1977
• Grant date: Oct 31, 1978
• Expiry date: Jul 18, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16G17/00
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention is a single-action double-lock snap, a snap hook having a lock arm. The hook includes a shank with a hook at one end of the shank. The other end of the snap is connected to a cable or a lanyard and in use, the hook is connected to an anchor eye or the like. To avoid accidental disengagement of the hook from the anchor eye, a lock arm, or gate, is pivoted on the shank of the hook to reach across the throat of the hook to engage the point of the hook. This lock arm will thus normally lock the hook upon an anchor eye. However, the possibility exists that the hook can be accidentally opened to release the hook from the anchor eye whenever the snap is swung about while connected to the anchor eye. A detent is pivotally mounted upon the shank to bear against a seat on the lock arm whenever the lock arm is extended to close the throat of the hook. When the detent is so seated, the lock arm cannot be opened. The detent may be swung to an out-of-the-way position against the hook shank to free the lock arm and permit it to open. A spring interconnects the detent with the lock arm in such a manner as to pull the detent to its seat to secure the lock arm in its locking position. …