High Modulus Polymer Retaining Device with Wear Indicator
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Solution Overview
Problem
Existing retaining devices for securing sockets to pneumatic air guns fail to prevent socket wear, leading to shearing forces that can cause metal pins to jam or break, requiring costly removal and lacking a visual indicator for socket suitability for continued use.
Innovation Solution
A one-piece retaining ring with a high modulus polymer insert and a socket wear indicator, featuring a crush gauge on the insert that visually indicates when the socket is worn, eliminating the need for a through hole and reducing the risk of pin failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal pin is used to secure the socket to the anvil, then the socket can be held in place, but the metal pin can be violently dislodged by centrifugal force when the O-ring is defective or missing
Solution Approach 1:
The retaining device combines a metal pin with a rubber O-ring in a single integrated structure. The metal pin provides structural strength to resist centrifugal force, while the rubber O-ring provides sealing and retention functions. This composite structure eliminates the need for separate metal and rubber components, ensuring both functions are always present together.
Solution Approach 2:
The patent merges the metal pin and rubber O-ring into a single integrated retaining device. The O-ring is formed with an integral projection that includes the metal pin, creating one unified component that performs both retention and sealing functions simultaneously, preventing the loss or neglect of either component.
2Duration of action of stationary object
If the socket is made softer than the anvil to extend tool life, then the socket absorbs wear, but the socket's drive hole deforms over time causing rotational movement and shearing force on the retaining ring
Solution Approach 1:
The retaining device uses a composite structure with a metal pin embedded in rubber material. The metal pin maintains structural integrity and resists deformation even when the softer socket material deforms from wear. This allows the socket to continue absorbing wear while the metal pin prevents excessive deformation that would cause rotational movement.
Solution Approach 2:
The rubber O-ring portion of the retaining device provides cushioning and compensation for the deformation that occurs as the socket wears. The elastomeric material can deform elastically to accommodate wear while maintaining the retaining function, preventing sudden failure from excessive deformation.
3Ease of operation
If a completely polyurethane retaining ring is used, then the pin can be easily removed, but the elastomeric pin can be sheared at the juxtapositions between the anvil and socket due to rotational movement
Solution Approach 1:
The retaining device combines metal and rubber materials in a single structure. The metal pin provides the shear resistance needed to prevent breaking under rotational stress, while the rubber matrix maintains the elastomeric properties that allow for easy removal and flexibility. This composite structure resolves the contradiction between strength and ease of operation.
4Reliability
If a metal sleeve is encapsulated in the elastomeric pin, then safety is improved, but the hollow metal sleeve cannot withstand strong shearing force and may be crushed or shattered
Solution Approach 1:
The patent uses a solid metal pin embedded in elastomeric material rather than a hollow metal sleeve. The solid metal construction provides both the safety benefits of metal reinforcement and the shear strength needed to withstand strong forces. The solid structure prevents crushing or shattering while maintaining the composite advantages of both metal and rubber materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents socket rotation and provides a clear visual alert for worn sockets, ensuring operator safety and extending tool life by preventing premature failure of the retaining device.
Implementation Method 1
a resin insert which can be compressed up to 50% of its original diameter (while maintaining its tensile strength and holding ability) without breaking
Implementation Method 2
a socket wear indicator that is located on a side of the insert and is positioned within the juxtaposition between the socket's cross-bore and the anvil's transverse through-hole to present a crush mark that visually indicates when the socket's drive aperture is worn
Data Source
AI summary
A retaining device to secure a socket to an anvil including an O-ring, an integral projection extending inwardly from the O-ring, and an insert secured at or near a far end of the integral projection. The insert may be made from a non-metallic high modulus material that can compress up to 50% of its original diameter without breaking. The insert may also include a socket wear indicator that consists, for example, of a raised ridge located within a recess on the side of the insert. The raised ridge, if crushed at the juxtaposition between the socket and the anvil, provide an early indication that the socket's drive aperture is worn and that the socket should be replaced.