Quick-Lock Sound Cap with Sliding Nut Fastener
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Solution Overview
Problem
Conventional nut and bolt fasteners require numerous rotations to tighten, leading to time consumption and repetitive-motion injuries, and they may loosen due to vibration, especially when used in environments like elevator control panels or automobile dashboards, where they are prone to disengagement and failure to securely mount sound-emitting transducers.
Innovation Solution
A panel-mountable sound-emitting apparatus with a shank member and nut member configuration, where the nut member is slid onto the shank member with teeth that lock into place using resilient flanges and tabs, allowing for quick assembly and secure mounting without the need for complete rotation, and a cap that can be easily rotated to adjust sound volume by aligning apertures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nut and bolt fasteners are used to mount sound-emitting transducers, then secure fastening is achieved, but numerous rotations are required leading to time consumption and repetitive-motion injuries
Solution Approach 1:
The fastening operation is segmented into two distinct phases: a sliding phase where the nut member moves linearly along the shank member to rapidly close the gap, and a locking phase where teeth engage to secure the connection. This segmentation eliminates the need for continuous rotational tightening, reducing installation time while maintaining secure fastening.
Solution Approach 2:
The nut member is designed with sliding surfaces and resilient flanges that enable preliminary positioning and gap closure before final locking. This preliminary action of sliding into place prepares the fastener for secure engagement without requiring multiple rotations, thereby reducing repetitive motion and installation time.
2Reliability
If conventional nut and bolt fasteners are used, then secure mounting is achieved, but numerous rotations may cause repetitive-motion injuries
Solution Approach 1:
The fastening operation is segmented into a sliding phase and a locking phase, eliminating continuous rotational motion. The sliding action requires minimal hand rotation, significantly reducing the risk of repetitive-motion injuries while the tooth engagement ensures secure mounting is still achieved.
Solution Approach 2:
The conventional rotational tightening mechanism is replaced with a sliding mechanism assisted by resilient flanges and tab engagement. This substitution changes the primary motion from rotational to linear, reducing the repetitive rotational strain on the operator's hands and wrists.
3Ease of manufacture
If conventional fasteners are used in vibrating environments, then initial fastening is achieved, but vibration may cause loosening and disengagement
Solution Approach 1:
The fastener is segmented into a body portion and a locking portion with interlocking teeth. The teeth are specifically designed to engage and lock the nut member to the shank member, preventing relative motion and disengagement caused by vibration, while the body portion facilitates easy assembly.
Solution Approach 2:
The resilient flanges provide dynamic compliance that allows the fastener to absorb vibrational forces. The flanges can deflect under load and return to their original position, maintaining continuous contact and preventing loosening in vibrating environments while preserving ease of assembly.
4Productivity
If threaded structures are displaced radially to permit sliding, then quick assembly is achieved, but tightening force may cause displacement and loosening
Solution Approach 1:
The fastener is divided into distinct functional elements: sliding surfaces for rapid assembly, resilient flanges for maintaining contact pressure, and interlocking teeth for secure locking. This segmentation allows each element to perform its specific function optimally without interfering with the others, ensuring both quick assembly and vibration resistance.
Solution Approach 2:
Different portions of the fastener have different local properties optimized for their specific functions. The sliding surfaces have low friction for quick assembly, the resilient flanges have elastic properties for maintaining contact, and the teeth have interlocking geometry for secure locking. This local optimization ensures both productivity and reliability.
Data Source
AI summary
A device for housing a sound-emitting transducer including a housing and a cap. The housing has a chamber defined by a cylindrical sidewall and an endwall with apertures. The cap mounts to the housing, and has apertures that can register with the apertures in the endwall. A groove is formed between the cap and teeth formed at its circular outer periphery. The cap's circular lip is inserted into the groove by deforming the cap slightly. Thus, relative movement is permitted between the cap and housing for registering and de-registering the apertures on the cap and housing. This controls the volume of the sound-emitting transducer.