Safety Helmet Face-Shield Cam Mechanism for Stable Positioning
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Solution Overview
Problem
Current safety helmets with face shields have complex attachments that can lead to unexpected movement of the face shield between stowed and deployed positions, posing risks and inefficiencies.
Innovation Solution
A safety helmet design featuring a snap plug, screw element, and cam profile mechanism that allows for smooth and secure transition of the face shield between stowed and deployed positions using a protrusion that engages with the cam profile, with grooves providing resistance to prevent accidental movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex attachment mechanism is used for the face shield, then the face shield can be securely attached, but the attachment becomes difficult to operate and may unexpectedly move between positions
Solution Approach 1:
The patent replaces complex mechanical attachment systems with a cam-profile-based mechanism. The cam profile converts simple rotational motion of the knob into controlled linear motion of the protrusion, achieving reliable face shield positioning with minimal operational complexity. This substitution eliminates the need for multiple fasteners or complicated locking mechanisms while maintaining secure attachment.
Solution Approach 2:
The patent utilizes the geometric parameters of the cam profile to control the attachment behavior. By designing the cam profile with specific curvature and groove patterns, the system transforms the operational parameter from complex multi-step adjustment to simple single-parameter rotation. The cam profile's geometry inherently provides the resistive movement and positioning control, eliminating the need for complex mechanical constraints.
2Ease of operation
If a simple attachment mechanism is used for the face shield, then the operation is easy, but the face shield may accidentally move from stowed to deployed position
Solution Approach 1:
The patent replaces simple but unreliable attachment mechanisms with a cam-profile-based system that inherently provides positional stability. The cam profile's geometric design creates natural stopping points and resistive zones that prevent accidental movement, while the overall mechanism remains simple to operate through single-handed knob rotation.
Solution Approach 2:
The patent employs curved cam profiles and grooves to provide smooth, controlled movement of the protrusion. The curvature of the cam profile creates natural resistance zones that prevent accidental disengagement while allowing intentional positioning. The rounded geometric features guide the protrusion through defined paths, ensuring the face shield remains securely in either stowed or deployed positions without accidental transitions.
3Manufacturing precision
If multiple components are used in the attachment mechanism, then the positioning is more precise, but the device complexity increases
Solution Approach 1:
The patent merges multiple attachment functions into a single integrated cam profile structure. The cam profile simultaneously provides positioning control, movement guidance, and stability maintenance that would otherwise require separate components. By combining these functions into one geometric element, the system achieves precise face shield positioning without increasing overall mechanism complexity.
Solution Approach 2:
The cam profile serves multiple functions: it guides the protrusion movement, provides positioning control through groove geometry, creates resistive zones to prevent accidental movement, and enables both stowed and deployed positions. This multi-functional design eliminates the need for separate positioning mechanisms, fasteners, and locking components, achieving precise positioning with minimal parts.
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 ensures stable and efficient positioning of the face shield, reducing the risk of accidental deployment or stowage, enhancing user safety and productivity by minimizing effort and maintaining the face shield in the desired position.
Implementation Method 1
the protrusion is configured to engage with the cam profile of the snap plug such that upon rotation of the face shield, the protrusion moves from a first position to a second position of the cam profile to change a position of the face shield
Implementation Method 2
the cam profile comprises one or more grooves configured to provide resistive movement to the protrusion of the screw element
Data Source
AI summary
A safety helmet comprising an outer shell, a snap plug attached to or monolithic with a first side of the outer shell. The snap plug comprises a first aperture and a cam profile. Further, a screw element comprising a first portion that further comprises a plurality of threads, and a second portion of screw element comprises a protrusion. Further, a crown comprising a face shield. The crown comprises a second aperture. Further, a knob comprising a cavity having inner threads. Further, the first portion of the screw element is positioned within the first aperture of the snap plug, the second aperture of the crown, and the cavity of the knob. Further, protrusion engages with the cam profile such that upon rotation of the face shield, the protrusion moves from a first position to a second position of the cam profile.