Dynamometer Weight Shaft Constricted Segments for Stable Stacking
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Solution Overview
Problem
Conventional dynamometer torque calibration systems face instability and safety issues during weight loading and unloading due to deep cutout portions in weights, leading to potential slippage and unbalanced stacks, especially when space is limited, necessitating cross-stacking which complicates operations.
Innovation Solution
A weight shaft with constricted segments and weights featuring cutout portions that allow for single-direction stacking, where the cutout width is tailored to accommodate the shaft, ensuring stability and safety by preventing slippage and allowing for balanced, single-direction stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If weights are stacked by inserting the weight shaft into deep cutout portions, then the weights can be stacked from one direction, but the stack becomes unstable and weights may slip down
Solution Approach 1:
The patent changes the geometric parameters of the weight shaft by introducing constricted segments with smaller diameters at specific positions. This allows the shaft to fit tightly into the cutout portions of weights, preventing slippage while maintaining single-direction stacking capability. The constriction diameter is specifically designed to be smaller than the cutout width, creating a secure fit.
Solution Approach 2:
The weight shaft is segmented into different diameter sections, with constricted segments positioned at specific locations. This segmentation allows different portions of the shaft to serve different functions: the constricted segments engage with weight cutouts for secure attachment, while the larger diameter sections provide structural support and spacing.
2Reliability
If cross-stacking is used to maintain balance, then safety is improved, but the operation becomes difficult due to limited space
Solution Approach 1:
By modifying the diameter parameters of the weight shaft to include constricted segments, the patent enables single-direction stacking to achieve the same security and balance as cross-stacking. The constricted segments create tight fits that prevent weight slippage, eliminating the need for alternating insertion directions.
3Ease of operation
If cutout portions extend beyond the center of weights, then weights can be inserted from one direction, but the stack becomes unstable
Solution Approach 1:
The patent changes the diameter parameter of the weight shaft at specific positions to create constricted segments. These constricted segments are positioned to engage with cutout portions that extend beyond the weight center, providing mechanical interlocking that prevents slippage while maintaining the benefits of extended cutouts for ease of insertion.
Data Source
AI summary
There are provided weight shaft 10 to be connected with arm 1a of dynamometer 1, weight placement section 11 supported by weight shaft 10 and weights 21 to be stacked on weight placement section 11. Weight shaft 10 includes constricted segment K at a predetermined position in the axial direction. Each weight 21 includes a cutout portion 24 cut out from a middle of a side end portion 22a and arranged to receive the constricted segment K. The cutout width of this cutout portion 24 is greater at a round hole 25 than at an open end 26b. Weights 21 are stacked on weight placement section 11 by lowering each weight in the state in which the constricted segment is inserted from the open end 26b into the round hole 25.