Offset Handle for Telescopic Frame with Integrated Latch Actuator
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Solution Overview
Problem
Conventional telescopic frames of carts and hand trucks face tradeoffs between structural integrity, convenient handling, and portability, often sacrificing these parameters and adding complexity and weight, particularly due to deficiencies in offset handle mechanisms that can lead to involuntary unlatching and compromised frame integrity.
Innovation Solution
An offset handle with a hollow C-shaped housing, an actuator, a two-pronged rocker, a ramp, and a pusher with rollers, which provides a secure and convenient mechanism for controlling the telescoping sections, allowing for increased frame extension and improved portability by engaging and disengaging the latching mechanisms safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control mechanism is separated from the handle, then the handle can be offset to prevent interference with the load, but the carrier becomes taller in the folded state and shorter when extended, increasing weight and reducing convenience
Solution Approach 1:
The patent combines the control mechanism for the telescoping frame with the offset handle assembly, integrating the latch actuator directly into the handle structure. This merger eliminates the need for separate height adjustment mechanisms while maintaining the offset handle's ability to prevent load interference, thereby reducing device complexity and weight.
Solution Approach 2:
The handle assembly serves multiple functions: it provides the offset grip to prevent load interference, houses the control mechanism for latching/unlatching the telescoping sections, and enables height adjustment. This multi-functionality eliminates the need for separate mechanisms, resolving the contradiction between ease of operation and device complexity.
2Ease of operation
If the control mechanism is separated from the handle, then the handle can be offset, but the carrier weight increases
Solution Approach 1:
By merging the control mechanism with the handle assembly, the patent eliminates the need for additional separate components that would increase weight. The integrated design uses the existing handle structure to house the latch actuator and control elements, thereby achieving the offset handle benefit without the penalty of increased carrier weight.
3Ease of operation
If a cam mechanism is used to constrain the handle offset, then the handle can be offset, but the frame's structural integrity is compromised and users may involuntarily unlatch the frame
Solution Approach 1:
The patent removes the problematic cam mechanism that constrained the handle offset and compromised structural integrity. Instead, it uses a direct mechanical linkage within the integrated handle assembly that provides stable control without relying on cam-based constraints, thereby maintaining frame integrity and preventing involuntary unlatching while still enabling handle offset.
Solution Approach 2:
The patent replaces the complex cam mechanism with a simpler, more reliable mechanical linkage system that is easier to manufacture and maintain. This simpler mechanism provides sufficient control for handle offset without the reliability issues of cam-based systems, effectively trading the complex short-lived cam mechanism for a more durable solution.
4Ease of operation
If conventional offset handle mechanisms are used, then the handle can be offset, but the frame's structural integrity is compromised
Solution Approach 1:
By integrating the control mechanism directly into the handle assembly, the patent creates a unified structural unit that strengthens the overall frame. The merged design eliminates separate mounting points and connection elements that would compromise structural integrity, while still providing the necessary handle offset for ease of operation.
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 solution enables safe and convenient control of telescopic frames, enhancing their range of extension and portability while maintaining structural integrity, particularly benefiting physically challenged users by allowing easy adjustment of handle height and terrain adaptation.
Implementation Method 1
an actuator (139) configured to move in the housing laterally relative to the poles and biased to an initial position by a spring (141)
Implementation Method 2
The pusher (142) may further contain rollers (143) for contacting separately said ramp and said crank
Data Source
AI summary
Disclosed is an offset handle for telescopic frames provides for convenient and safe control of the telescopes, increased range of the frame extension, and improved portability when folded. The handle includes a hollow C-shaped housing configured for attaching to a pair of interlatching telescoping poles, an actuator configured to move in the housing laterally relative to the poles and biased to an initial position, a two pronged rocker having a crank, said two pronged rocker mounted pivotally within the housing and configured for engaging latching mechanisms of each of the poles, a ramp formed within the housing, and a pusher attached pivotally to said actuator. Said pusher configured to move between said ramp and said crank of said two pronged rocker.