Elastically Deformable Rack Adjustment Device for Helmet
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Solution Overview
Problem
Existing adjustment devices for objects like helmets, which use a rack and pinion system, can be damaged when forced beyond the optimum adjustment position due to excessive stress on the teeth and connecting means.
Innovation Solution
An adjustment device with elastically deformable racks and a housing that provides clearance for the racks to disengage from the pinion teeth when excessive force is applied, allowing the racks to deform and return to a safe position, reducing stress on the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adjustment device uses a rigid rack and pinion system, then the adjustment mechanism is strong and stable, but the device can be damaged when forced beyond the optimum adjustment position due to excessive stress on the teeth
Solution Approach 1:
The rack is designed with elastically deformable material properties, allowing it to change its mechanical state from rigid to flexible under excessive force. This parameter change enables the rack to absorb stress through elastic deformation rather than transmitting it to the pinion teeth, preventing damage while maintaining strength during normal operation
Solution Approach 2:
The housing is designed with clearance space beforehand to accommodate the elastic deformation of the rack when excessive force is applied. This pre-planned cushioning space allows the rack to disengage from the pinion teeth through elastic deformation, protecting the teeth from damage before the damage can occur
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
Prevents damage to the device by allowing the racks to elastically deform and disengage from the pinion teeth when excessive force is applied, ensuring the device returns to a safe adjustment position, thus protecting the teeth and connecting means.
Implementation Method 1
the first rack is elastically deformable, so that when a force is exerted on this first rack in the opposite direction to the direction of translation during rotation of the pinion, the first rack undergoes an elastic deformation
Data Source
Figure 1~5
Figure 2~4
AI summary
The device has longitudinal elastically deformable toothed bars (4, 7) subjected to an elastic deformation when a force (F) is exerted on the bars in a direction against a translation direction (T) during rotation of a pinion (1). The pinion is housed in a housing (3) that leaves a gap (J1) for the bars in a rotation plane perpendicular to the direction (T). The gap is equal to a small tooth from two rows of teeth so that a tooth from one row cooperated with the other row of teeth (2) of the pinion is disengaged from a tooth of the latter row when the bars are subjected to the deformation. An independent claim is also included for an object comprising an adjusting unit.