Gear Cam Mounting Device Dual-Hinge Portable Terminal
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Solution Overview
Problem
Conventional dual-hinge devices in portable terminals are prone to damage from impacts and excessive rotational forces due to a lack of structural reinforcement in the engagement structure between locking members and gear cams, leading to deformation and damage of locking members and gear cams.
Innovation Solution
The implementation of a gear cam mounting device with reinforced locking structures, including perpendicular locking units and stoppers, to securely attach gear cams to hinge shafts and prevent excessive rotation, enhancing the structural strength and durability of the dual-hinge device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional locking member with insert molding is used to attach the gear cam to the hinge shaft, then the device can be manufactured with simple structure, but the engagement structure lacks sufficient strength to withstand impacts and excessive rotational forces
Solution Approach 1:
The locking structure is divided into multiple components: a locking member with insert molding, a locking protrusion, and a locking groove. This segmentation allows each component to be optimized for its specific function while maintaining manufacturability. The locking member provides the basic attachment, the protrusion provides mechanical interlocking, and the groove provides precise positioning.
Solution Approach 2:
The locking member uses composite construction combining insert molding (likely metal or rigid plastic) with the gear cam body. This composite approach creates an engagement structure with superior strength and durability compared to single-material constructions, enabling it to withstand impacts and excessive rotational forces while maintaining a relatively simple overall structure.
2Reliability
If the gear cam is allowed to rotate freely around the hinge shaft, then the device has simple structure, but the gear cam can be damaged by excessive rotation forces
Solution Approach 1:
The rotation restriction structure is pre-configured into the gear cam and hinge shaft assembly. The locking protrusion and groove are formed in advance during manufacturing, creating built-in mechanical stops that prevent excessive rotation before damage can occur. This preliminary structuring eliminates the need for additional active control mechanisms.
Solution Approach 2:
The rotation restriction is achieved by adding a dimensional constraint in the radial direction through the locking protrusion and groove geometry. Instead of relying solely on axial positioning, the design uses radial interlocking features that mechanically limit the angular range of motion, preventing excessive rotation while maintaining simple structure.
3Stability of the object's composition
If the locking member is firmly attached to the hinge shaft, then the gear cam mounting is stable, but the locking member can be deformed or damaged by impacts
Solution Approach 1:
The insert molding construction of the locking member provides inherent shock absorption and stress distribution capabilities. The molding process creates a integrated structure that can accommodate impact forces without concentrated stress points, preventing deformation and damage while maintaining stable gear cam mounting.
Solution Approach 2:
The locking member's composite construction (insert molding) combines materials with different mechanical properties to create a structure that is both firmly attached and resistant to impact damage. The composite nature allows for optimized stress distribution and energy absorption during impact events.
Data Source
AI summary
A gear cam mounting device in a dual-hinge device for a portable terminal is provided, in which first and second hinge shafts provide first and second parallel hinge axes, respectively, first and second gear cams are fixed around the first and second hinge shafts, in engagement with each other, and first and second locking units penetrate respectively through the first and second gear cams in a direction that is perpendicular to the first and second hinge axes, for locking the first and second gear cams to surround the first and second hinge shafts.