Keyboard Connector Hook Mechanism for Compact Assembly
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Solution Overview
Problem
Conventional keyboard instruments require space for screw attachment from the upper side, leading to enlarged instrument cases and cumbersome assembly processes, especially when attaching the keyboard chassis to the shelf plate.
Innovation Solution
A keyboard instrument design featuring a connector unit with hooks protruding towards the back side, allowing the keyboard chassis to be fixed to the instrument case without the need for screw attachment from the lower surface, enabling compact assembly and secure locking using a locking plate between the hook and shelf plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw attachment from the upper side is used to fix the keyboard chassis to the shelf plate, then the fixation is secure, but the instrument case becomes enlarged and the assembly process becomes cumbersome
Solution Approach 1:
The patent inverts the conventional screw attachment direction by attaching screws from the lower surface side of the shelf plate instead of from the upper side. This allows the keyboard chassis to be fixed securely without requiring additional space above the keyboard, thereby maintaining compact instrument case dimensions while ensuring reliable fixation
Solution Approach 2:
The patent changes the attachment dimension by moving the screw attachment point from the upper surface dimension to the lower surface dimension of the shelf plate. This dimensional shift enables secure fixation without increasing the vertical height or overall volume of the instrument case
2Volume of stationary object
If screw attachment from the lower surface side is used to fix the keyboard chassis to the shelf plate, then the instrument case remains compact, but the assembly process requires inverted assembly and becomes more difficult
Solution Approach 1:
The patent applies preliminary action by pre-attaching the reinforcement rib to the lower surface of the shelf plate before assembling the keyboard chassis. This preparation creates a ready-made attachment structure that guides the screw attachment process, making it easier to perform from the lower surface side without requiring complex inverted assembly operations
Solution Approach 2:
The patent introduces a reinforcement rib as an intermediary element between the shelf plate and the keyboard chassis. This rib serves as a mediator that provides both structural reinforcement and a convenient attachment interface, allowing screws to be easily attached from the lower surface side while distributing the fixation load effectively
3Strength
If a reinforcement rib is attached to the lower surface of the shelf plate, then the fixation strength is improved, but the device complexity increases
Solution Approach 1:
The patent merges the reinforcement rib and the attachment interface into a single integrated structure. The rib is formed as part of the shelf plate assembly, combining the structural reinforcement function and the screw attachment function into one element, thereby improving fixation strength without significantly increasing overall device complexity
Solution Approach 2:
The reinforcement rib serves multiple functions simultaneously: it reinforces the shelf plate structure to handle fixation loads, provides an attachment interface for screws, and guides the positioning of the keyboard chassis. This multi-functionality improves fixation strength while avoiding the need for separate components, thus limiting the increase in device complexity
Data Source
AI summary
A keyboard instrument includes an instrument case having a front plate, a shelf plate, and a connector unit, wherein the connector unit is configured to fix the front plate and the shelf plate and includes a hook protruding towards a back side in a longitudinal direction of a key, and a keyboard having a locking unit and fixed to the instrument case in such a state that the locking unit is disposed between the hook and the shelf plate.