Height-adjustable footrest
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Solution Overview
Problem
Existing chair footrests with height-adjustable mechanisms require two hands to release the locking pins, leading to potential damage and inefficient height adjustment.
Innovation Solution
A locking mechanism featuring two blocking rods and an adjustment means that allows for simultaneous release of both locks with one hand, utilizing a rotatable adjustment disc and pressure springs to ensure safe and easy height adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate locking pins with manipulating units are used to lock the footrest at two chair legs, then the footrest can be securely locked, but releasing both locks requires two hands and may cause damage to the locking mechanism
Solution Approach 1:
Two separate locking mechanisms are merged into a single integrated locking means. The adjustment means (13) combines both manipulating units into one component that can simultaneously control both blocking rods (11a, 11b), enabling secure locking while allowing one-handed release operation.
Solution Approach 2:
The adjustment means (13) acts as an intermediary that coordinates the release of both blocking rods. By rotating this single adjustment means, both blocking rods are moved synchronously in opposite directions, ensuring both locks are released simultaneously without requiring two hands.
2Reliability
If two separate locking pins are used, then the footrest can be locked at two chair legs, but the releasing process is time-consuming and may damage the locking pin or locking hole
Solution Approach 1:
The two locking operations are merged into a single rotational motion of the adjustment means (13). This allows both blocking rods to be released simultaneously in one continuous motion, dramatically increasing the speed of height adjustment and eliminating the sequential two-handed operation.
Solution Approach 2:
The adjustment means (13) is designed to move both blocking rods synchronously in opposite directions during rotation. This coordinated preliminary action ensures both locks are released at the same time, preventing the footrest from shifting mid-operation and avoiding damage to the locking mechanism.
3Reliability
If two separate locking pins are used, then the footrest can be locked securely, but the structure becomes more complex
Solution Approach 1:
The adjustment means (13) merges two separate manipulating units into a single integrated component. This reduces the overall number of parts, simplifies the structure, and makes the locking mechanism more compact while maintaining secure locking capability at both chair legs.
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
Enables safe and efficient one-handed height adjustment of the footrest, preventing damage to the locking mechanism and allowing for faster and more reliable height changes.
Implementation Method 1
A return means, preferably, a pressure spring, may be assigned to the two blocking rods and/or the two rod extensions. Preferably, the return means is adapted to move the blocking rods outwards away from the rotation axis.
Data Source
AI summary
A lock is provided for locking a footrest at two chair legs of a chair is provided. The lock has a first blocking rod, a second blocking rod, and an adjustment means cooperating with the two blocking rods. The adjustment means is supported rotatably about a rotation axis, the two blocking rods are arranged coaxially and spaced apart from each other and are respectively perpendicular with respect to the rotation axis (DA), the two blocking rods are respectively coupled to the adjustment means, and a rotation of the adjustment means about the rotation axis (DA) causes the two blocking rods to move synchronously in opposite directions. Also provided are a footrest having a lock according to this disclosure and a chair having one or both of a lock according to this disclosure and a footrest according to this disclosure.