Ratcheting Tufting Button Lock for Controlled Cushion Compression
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Solution Overview
Problem
Existing tufting button and locking member systems for upholstery do not effectively compress and secure furniture cushions, lacking a mechanism to control the depth of insertion and ensure proper engagement of the tufting button with the locking member.
Innovation Solution
A tufting button with an elongated shaft featuring a ratchet portion and ridges, combined with a locking member having a pawl and a centrally located pawl housing with a gap, where the shaft partially resides within the locking member, allowing the ridges to engage the pawl and compress the cushion, and a protrusion on the shaft limits the insertion depth, trapping the cushion between the button head and the locking member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the tufting button shaft is inserted into the locking member without a depth limit, then the cushion compression can be maximized, but the button may be over-compressed or damaged and the locking mechanism may not engage properly
Solution Approach 1:
A protrusion is provided on the shaft that acts as a stop to preliminarily determine the insertion depth before the locking mechanism engagement. This preliminary action prevents over-insertion and ensures proper positioning of the ratchet portion for reliable engagement with the pawl.
2Force
If the tufting button shaft is inserted deeply into the locking member, then the cushion compression is increased, but the shaft may become misaligned or the locking mechanism may fail to engage
Solution Approach 1:
The protrusion on the shaft performs a preliminary alignment function by engaging with the locking member at a predetermined position. This ensures the shaft is correctly positioned before the ratchet portion engages with the pawl, preventing misalignment issues.
3Ease of operation
If the tufting button allows free movement during insertion, then the installation process is simpler, but the button cannot be securely positioned at the correct depth
Solution Approach 1:
The protrusion provides a preliminary stop that automatically limits insertion depth without requiring complex adjustment mechanisms. This maintains ease of installation while achieving precise depth control through the mechanical stop feature.
4Force
If the locking member allows excessive shaft insertion, then the cushion can be compressed to maximum density, but the button head may be damaged or the fabric may be torn
Solution Approach 1:
The protrusion on the shaft performs a preliminary protective function by establishing a maximum insertion depth limit. This prevents the button head from being over-driven into the fabric and cushion, avoiding damage while still allowing sufficient compression force.
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
This configuration allows for controlled compression of the furniture cushion to a desired depth, ensuring secure engagement and positioning of the tufting button relative to the cushion and fabric, while preventing rightward extraction of the button head.
Implementation Method 1
The elongated shaft includes a ratchet portion, and the ratchet portion includes a plurality of ridges therein. The locking member includes a pawl. A portion of the plurality of ridges engages the pawl of the locking member.
Implementation Method 2
The elongated shaft includes a protrusion thereon and the protrusion of the elongated shaft is a stop limiting the depth of insertion of the elongated member into the pawl of the locking member.
Implementation Method 3
compressing the furniture cushion, and, a portion of the plurality of ridges engages the pawl of the locking member compressing the furniture cushion.
Data Source
AI summary
A tufting button and locking member, in combination with a furniture cushion and fabric thereover wherein the tufting button includes a head and an elongated shaft. The elongated shaft includes a ratchet portion. The ratchet portion includes a plurality of ridges therein. The locking member includes a pawl. The elongated shaft of the tufting button is inserted into and through the furniture cushion and fabric thereover. The elongated shaft resides, partially, within the locking member. A portion of the plurality of ridges engages the pawl of the locking member compressing the furniture cushion.