Floating Timing Bar for Synchronized Drawer Pinions
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Solution Overview
Problem
The manufacturing process of cabinets can result in dimensional variations, making it challenging to mount a timing bar compatible with the rack-and-pinion mechanism used in drawers, which affects the proper operation of the drawer's opening and closing mechanism.
Innovation Solution
The design includes a timing bar with a U-shaped cross-section that engages neck portions of pinions, allowing for adjustable mounting through a slit and screw holes, enabling the pinions to rotate synchronously while accommodating variations in cabinet spacing, ensuring consistent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed timing bar is used to connect pinions, then the synchronization of pinion rotation is improved, but the adaptability to dimensional variations in cabinet spacing deteriorates
Solution Approach 1:
The timing bar is designed with a floating pinion that can move dynamically along the longitudinal axis to adjust for dimensional variations in cabinet spacing, while the slit and protrusion mechanism maintains rotational synchronization. This dynamic adjustment capability resolves the contradiction by allowing the system to adapt to different spacing dimensions while preserving the synchronization function.
Solution Approach 2:
The slit in the timing bar acts as an intermediary mechanism that allows the protrusion from the floating pinion to move within the slit, accommodating dimensional variations. This intermediary structure enables the timing bar to bridge the gap between fixed synchronization requirements and variable spacing conditions.
2Strength
If the timing bar is made fixed and rigid, then the structural strength is improved, but the ease of manufacture deteriorates due to precision requirements
Solution Approach 1:
The timing bar is segmented into a fixed portion and a floating pinion portion, where the floating pinion can move independently along the longitudinal axis. This segmentation allows the main timing bar structure to remain strong and rigid while the floating portion accommodates dimensional variations, reducing manufacturing precision requirements and improving ease of manufacture.
3Reliability
If the pinion is made fixed to the timing bar, then the rotational synchronization is improved, but the adaptability to spacing variations deteriorates
Solution Approach 1:
The pinion is designed as a floating component that can move dynamically along the longitudinal axis of the timing bar, allowing it to adapt to spacing variations while the slit mechanism ensures rotational synchronization is maintained. This dynamic design resolves the contradiction between fixed synchronization and variable spacing adaptability.
Data Source
AI summary
A rack-and-pinion mechanism includes a first rack and a second rack, a first pinion and a second pinion, and a timing bar. Each of the racks includes a first set of teeth provided longitudinally therealong. Each of the first pinion and the second pinion includes a second set of teeth provided circumferentially therearound. The first pinion and the second pinion are configured to rotate along the first rack and the second rack respectively through engagement of the second set of teeth with the first set of teeth. The timing bar includes a first end and a second end. The first end and the second end are configured to be coupled to the first pinion and the second pinion respectively so that the first and second pinions rotate as one. The first pinion is configured to be movable with respect to the timing bar along a longitudinal axis of the timing bar.