Walker Tip Felt Nap Arcuate Shell Noise Dampening
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Solution Overview
Problem
Conventional walker leg tips made of plastic produce irritating chirping noises and vibrations due to friction on hard surfaces, and they wear out quickly, especially when used outdoors, with makeshift solutions like tennis balls offering temporary relief but being prone to improper fit and wear.
Innovation Solution
An improved walker leg tip featuring an arcuate shaped shell with a felt nap covering the bottom portion, optionally including a sleeve and removable insert for secure fit, providing friction and noise dampening, and made from materials like polymers or vulcanized rubber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If plastic tips are used on walker legs, then the walker structure is simple and inexpensive, but they produce chirping noises and vibrations that irritate the user
Solution Approach 1:
The tip combines a hard plastic shell with a felt nap layer, creating a composite structure where the plastic provides structural integrity while the felt nap eliminates chirping noises and vibrations through its fibrous texture that dampens contact with the floor surface
Solution Approach 2:
The felt nap is applied only to the bottom surface of the tip where contact with the floor occurs, while the rest of the tip maintains the hard plastic material for structural strength, optimizing both noise reduction and structural performance in different locations
2Reliability
If plastic tips are used on walker legs, then the tip structure is simple, but they wear and break quickly especially when used outside
Solution Approach 1:
The combination of hard plastic shell and felt nap layer creates a tip that is more durable than plastic alone, as the felt nap protects the plastic from direct wear and tear while maintaining the overall structural integrity of the tip
Solution Approach 2:
The felt nap layer acts as a protective cushion applied beforehand to the plastic shell, absorbing wear and mechanical stress before they can damage the underlying plastic structure, thereby extending the tip's service life
3Object-generated harmful factors
If tennis balls are placed on walker legs to reduce noise, then chirping noise and vibrations are reduced, but the fit is loose and they can be knocked off during use
Solution Approach 1:
The felt nap is precisely applied to the bottom contact surface of a properly fitted plastic shell, concentrating the noise-reducing property exactly where needed while maintaining a secure, form-fitting structure that prevents the tip from being knocked off during use
Solution Approach 2:
The felt nap layer acts as a flexible covering that conforms to the plastic shell's shape and provides secure attachment to the walker leg while eliminating the loose fit problem of tennis balls, as it is firmly bonded to the shell structure
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 improved tip effectively reduces noise and vibrations, maintains secure attachment, and withstands wear and tear better than traditional plastic tips, offering a durable and comfortable walking experience.
Implementation Method 1
The sliding of the plastic tips on the rear legs across the floor or surface can create a chirping noise and produce vibrations that are transmitted to the hands and arms of the user. The chirping noise and vibrations can be a source of irritation for the user and are produced by friction between the plastic tips on the rear legs and the smooth hard surface.
Implementation Method 2
The outer felt nap is typically a layer of fibrous material that is glued onto a shell of vulcanized rubber with the textile fabric typically including warp and weft threads made of wool and/or synthetic yarn. The nature of the weave is usually not important and can be a simple, single layer weave or a multilayer weave. In addition, the nature of the fibrous web is not critical and those skilled in the art are aware of a variety of fibrous webs that can produce the physical characteristics of a tennis ball fabric covering.
Data Source
AI summary
An improved walker leg tip having a felt nap is provided. The walker leg tip has an arcuate shaped shell with the shell having a top portion and a bottom portion. The top portion has an aperture at least partially therethrough, the aperture dimensioned to accept an end portion of the walker leg. The felt nap covers at least part of the bottom portion of the arcuate shaped shell. In some instances, the arcuate shaped shell is spherically shaped and can be made from a polymer, vulcanized rubber and the like. Optionally, a sleeve can extend from the top portion of the shell, the sleeve having a sleeve aperture that is in alignment with the aperture of the top portion and dimensioned to fit at least partially over an end portion of a walker leg. A removable insert can also be included, the insert having an outer diameter dimensioned to fit at least partially into the aperture of the top portion and an inner diameter dimensioned to fit at least partially onto the end portion of the walker leg.