Sheet Retainer with Locking Pin and Adjustable Straps for Mattress Fit
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Solution Overview
Problem
Existing sheet retainers, including fitted sheets and previous inventions like U.S. Pat. No. 9,055,830, fail to maintain a smooth and tight fit over mattresses due to size mismatches, loss of elasticity, and inconvenience, especially on adjustable beds, leading to user discomfort and premature wear.
Innovation Solution
A sheet retainer system with adjustable straps and locking pins featuring flexible slits and convex shapes to accommodate various mattress sizes, ensuring the sheet remains tight without tearing or damaging the sheet, even on adjustable beds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking pin is used to secure the sheet, then the sheet remains tight over the mattress, but the locking pin may pop out when pressure is applied
Solution Approach 1:
The locking pin is nested within a locking hole that has a wide upper portion and a narrow lower portion. The pin fits into the wide portion when inserted, and the narrow portion prevents it from popping out, creating a secure nested configuration that maintains both insertion ease and retention stability.
Solution Approach 2:
The locking hole has non-uniform cross-sectional dimensions along its length, with the upper portion being wider than the lower portion. This local variation in geometry provides different functions at different locations: the wide upper portion facilitates easy insertion, while the narrow lower portion prevents accidental ejection, solving the contradiction between ease of operation and stability.
2Reliability
If fitted sheets with elastic bands are used, then the sheet stays tight over the mattress, but the elastic band loses elasticity over time due to wear and washing
Solution Approach 1:
The elastic band component is extracted and replaced with a rigid locking pin and locking hole mechanism. This removes the element subject to elastic fatigue and degradation from washing, while maintaining the sheet-tightening function through a different mechanical principle that does not degrade over time.
Solution Approach 2:
The invention replaces the long-lasting but degradable elastic band with a simple, durable locking mechanism that can be easily replaced if needed. The locking pin and hole system uses non-degradable materials and mechanical interlocking rather than elastic properties, eliminating the gradual failure mode of elastic bands.
3Reliability
If fitted sheets are used, then the sheet remains tight, but they are inconvenient to fold and iron
Solution Approach 1:
The elastic band that causes folding and ironing difficulties is extracted and replaced with a separate locking pin mechanism. This allows the sheet itself to remain simple and flat without embedded elastic components, making it easier to fold and iron while the tightening function is provided by the external locking pins.
Solution Approach 2:
The sheet retention function is segmented from the sheet fabric itself. The sheet remains a simple, flat piece of fabric that is easy to care for, while the retention function is provided by separate locking pins and holes that can be attached or removed as needed, separating the concerns of fabric care and sheet retention.
4Adaptability or versatility
If adjustment straps are made flexible to accommodate various mattress sizes, then the retainer fits different beds, but the straps may allow the locking pin to slip out
Solution Approach 1:
The locking hole has varying cross-sectional dimensions along its length, with the upper portion being wider than the lower portion. This local variation in geometry provides different functions at different locations: the wide upper portion facilitates easy insertion, while the narrow lower portion prevents accidental ejection, solving the contradiction between ease of operation and stability.
Data Source
AI summary
In accordance with an embodiment of the present invention there is provided a sheet retainer for retaining sheet smooth and tight over mattress including, one or more adjustment straps circumference said mattress. The sheet retainer further includes one or more locking pins having an inserting cylindrical portion. The sheet retainer further includes one or more retainer bodies having a locking hole with upper, bottom, and middle hole portions. Flexible lock pin slits utilized for locking the locking pin into the retainer body. The sheet retainer body further having strap slide/lock slits for sliding the sheet retainer body along the adjustment straps and locking the sheet retainer body from moving along the adjustment strap after tightening said adjustment strap to the mattress. For tightening a sheet over the mattress, the sheet is spread over the mattress, then user inserts the insetting poltion of the locking pin into the locking hole wide section and slides the locking pin upwards towards the narrow section in the locking hole and by doing so, fixes the sheet to the sheet retainer body, ensuring a smooth and tight fit over the mattress. To prevent the locking pin from slipping out of the locking hole, the locking pin and the locking hole are shaped so that the locking pin is firm and can be opened only by the user and not slide out spontaneously due to pressure.