Cam-Actuated Bath Safety Rail for Low-Hand-Strength Suction Grip
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Solution Overview
Problem
Conventional bath safety rails anchored by suction cups are difficult for individuals with arthritic fingers or weak hands to operate effectively, as they require strong grip and motion to create and maintain suction, which can be challenging, especially in slippery environments.
Innovation Solution
A cam and cam follower mechanism is integrated into the bath safety rail, converting rotary motion into linear motion to draw the suction cup tightly against a smooth surface, creating and maintaining suction with ease, and featuring a handle design that allows operation by individuals with limited dexterity, including those with arthritis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a suction cup mechanism is used to anchor the bath safety rail, then the rail can be removed and repositioned easily, but it requires strong grip and hand motion to create and maintain suction, which is difficult for individuals with arthritic fingers or weak hands
Solution Approach 1:
A cam mechanism acts as an intermediary between the user's rotational motion and the suction cup's linear compression. The cam converts easy rotational motion into the linear force needed to create and maintain suction, eliminating the need for users to directly grip and compress the suction cup with their fingers.
Solution Approach 2:
The direct manual compression mechanism is replaced with a cam-based mechanical system. Instead of relying on finger strength to compress the suction cup, the cam mechanism provides mechanical advantage to achieve the same compression through rotational motion of a knob or handle.
2Reliability
If the suction cup is designed to create strong suction for stable attachment, then the rail remains securely in place, but the suction may release suddenly in slippery conditions, creating safety hazards
Solution Approach 1:
The cam mechanism allows dynamic adjustment of the suction force. The user can gradually increase compression to create stable suction, and equally easily release it by reversing the rotational motion, providing control over the attachment state rather than a binary on/off condition.
Solution Approach 2:
The cam mechanism provides tactile feedback to the user during operation, allowing them to sense when sufficient compression is achieved and when the suction is properly established, enabling precise control to avoid over-compression or sudden release.
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 mechanism allows for easy and secure attachment and detachment of the bath safety rail, providing reliable stability and ease of use for individuals with limited hand strength, while minimizing the risk of sudden suction release in slippery conditions.
Implementation Method 1
A bath safety rail may be a permanent part of the fixtures in a bathroom or a removable tool that can be engaged to and disengaged from smooth surfaces of the bathroom
Data Source
AI summary
A bath safety rail for being engaged to and disengaged from a bath surface. The bath safety rail includes a base, a handle on the base, first and second suction cups opposing the handle, cam followers on the suction cups that extend into the base, and cams in the base to engage and draw up the cam followers and suction cups to thereby create suction. The handle is two-piece where the pieces are separated by a handle plane, where each axis of each suction cup is in the handle plane.