U-Shaped Clamp Pullup Handle for Doorframe Stability
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Solution Overview
Problem
Conventional pullup bars are not compact, lack stability, can cause damage to doorframes, and are cumbersome for travel, making them inconvenient for use and transportation.
Innovation Solution
A compact pullup handle system featuring a U-shaped clamp with adjustable parallel rails, telescoping arms, and hinges that allow for secure attachment to doorframes, ensuring stability and ease of use while being foldable for transport, and incorporating a grip and locking mechanism for user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional pullup bar is used, then it can provide exercise functionality, but it takes up space across the width of the door and is not compact
Solution Approach 1:
The pullup bar is divided into multiple segments including telescoping arms that can be extended or retracted. The arms can be segmented to allow compact storage when not in use, reducing the space occupied while maintaining full functionality when deployed.
Solution Approach 2:
The pullup bar incorporates dynamic elements such as telescoping mechanisms and movable arms that can adjust between extended and retracted positions. This allows the device to transition between a compact storage state and a functional exercise state, optimizing both compactness and ease of operation.
2Ease of operation
If a conventional pullup bar is left on the doorway, then it is easily accessible, but it prevents the door from closing
Solution Approach 1:
The pullup bar is designed as a segmented structure that can be disassembled or collapsed into a compact form. This allows the door to close completely when the bar is stored, while still providing easy access when deployed for exercise.
Solution Approach 2:
The dynamic telescoping and folding mechanisms enable the pullup bar to adapt its configuration based on whether the door needs to close or the user needs access. The bar can be quickly deployed or stowed to accommodate door closure requirements.
3Area of stationary object
If pullup bars are placed where they cause the least inconvenience, then door closure is maintained, but they are not in a convenient location to encourage exercise
Solution Approach 1:
The pullup bar's dynamic design allows it to be positioned in the optimal location for exercise when deployed, while still permitting door closure when stowed. The ease of deployment and retraction encourages users to place it in the most convenient exercise location rather than compromising locations.
4Device complexity
If pullup bars use user weight to stabilize the bar position, then no brackets are needed, but shifting weight dramatically affects stability resulting in fall and/or injury
Solution Approach 1:
The clamp features a curved or spherical contact surface that distributes the user's weight over a larger area of the door frame. This curved design provides more stable contact points and prevents the clamp from tipping or shifting when the user moves, enhancing stability without requiring brackets.
Solution Approach 2:
The clamp's contact surface geometry is optimized to change the distribution of force from a narrow point contact to a broader area contact. This parameter change in the contact interface increases stability and reliability while maintaining the simple attachment design.
5Reliability
If brackets or other attachment means are installed to increase stability, then stability is improved, but all ability to move the bar is removed eliminating portability
Solution Approach 1:
The attachment mechanism is designed as a removable clamp rather than a permanent bracket. The segmented design allows the clamp to be easily attached and detached, providing stable attachment when in use while maintaining full portability and the ability to move the bar to different locations or store it completely.
6Reliability
If a support bar is pressed against a door frame to prevent the pullup bar from falling, then stability is improved, but permanent damage is caused to the door frame
Solution Approach 1:
The clamp incorporates a flexible or compliant contact surface that distributes pressure across a larger area of the door frame. This flexible interface prevents concentrated pressure points that would cause damage, while still providing sufficient friction and normal force to prevent the pullup bar from falling.
Solution Approach 2:
The clamp design includes cushioning elements or a compliant contact surface that absorbs and distributes the force before it reaches the door frame. This beforehand cushioning prevents the concentrated pressure that would otherwise cause permanent damage to the door frame.
7Volume of moving object
If pullup bars have a compact design for travel, then they can be placed in luggage, but they require partial disassembly which is inconvenient
Solution Approach 1:
The pullup bar uses dynamic telescoping and folding mechanisms that allow compact configuration for travel without requiring complete disassembly. The movable joints and telescoping sections enable easy collapse into a compact form factor that fits in luggage, while maintaining simple one-handed operation for deployment.
Data Source
AI summary
A pullup handle includes a U-shaped clamp configured to secure the pullup handle to a desired location. The U-shaped clamp includes an arm on a first side of the U-shaped clamp, a support on a second side of the U-shaped clamp opposite the arm, and a base between the arm and the support. The pullup handle also includes a handle attached on the base of the U-shaped clamp.