Vacuum Screwdriver Sleeve Layout for Narrow Screw Access
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Solution Overview
Problem
Prior power screw drivers with vacuum pick-up features face challenges in accessing narrow screw positions due to a wide housing and vacuum chamber arrangement, which obstructs the bit and causes screw wobbling during tightening due to relative rotation between the bit and suction nozzle.
Innovation Solution
A power screw driver design with a slim housing and a bit supporting sleeve journaled by a bearing, featuring a vacuum chamber that communicates with sub-atmospheric pressure through longitude vacuum passages, allowing the vacuum to reach the screw at an axial distance from the chamber, thus avoiding housing obstruction and reducing relative rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing includes a forwardly extended vacuum chamber that communicates directly to the bit surrounding suction nozzle, then the vacuum pick-up function is achieved, but the wide forward part of the housing obstructs the bit from reaching the screw and causes accessibility limitations
Solution Approach 1:
The vacuum chamber is segmented into a main body portion and a separate suction nozzle portion. The suction nozzle is detachably connected to the bit supporting sleeve, allowing the vacuum chamber to be positioned away from the forward end while maintaining vacuum functionality. This segmentation enables the housing to be slimmer without compromising the vacuum pick-up function.
Solution Approach 2:
The bit supporting sleeve acts as an intermediary component that connects the suction nozzle to the bit. It provides a journal bearing support for the bit while allowing the suction nozzle to be positioned at an optimal location for vacuum pick-up, decoupling the housing structure from the suction nozzle position.
2Stability of the object's composition
If the bit surrounding suction nozzle is rigidly attached to the housing via the vacuum chamber, then structural stability is achieved, but relative rotation between the bit and suction nozzle causes screw wobble and contact loss during tightening
Solution Approach 1:
The bit supporting sleeve is designed to rotate relative to the housing through a journal bearing connection. This dynamic arrangement allows the bit to rotate freely with the driving spindle while the suction nozzle remains stationary relative to the housing, eliminating relative rotation between the bit and suction nozzle during the tightening operation.
Solution Approach 2:
The suction nozzle is extracted from the rigid housing structure and made detachably connectable to the bit supporting sleeve. This separation allows the suction nozzle to be positioned independently to minimize relative rotation, while the bit supporting sleeve provides the necessary rotational freedom for the bit.
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
Facilitates access to narrow screw positions and improves the tightening process by maintaining consistent screw contact, reducing wobbling and friction, and enhancing airflow for efficient screw pick-up and tightening.
Implementation Method 1
a vacuum chamber (31) arranged to communicate with a source of sub-atmospheric pressure... extending from its rear end part (26b) to its forward end part (26a)
Implementation Method 2
The bit supporting sleeve (26) is journaled by a bearing (27) between a forward end part (26a) and a rear end part (26b)
Data Source
AI summary
A power screwdriver includes a housing having a vacuum chamber arranged to communicate with a source of sub-atmospheric pressure. The power screwdriver includes a motor, a bit drive spindle, and a bit supporting sleeve connected to the bit drive spindle. The rear end part of the bit supporting sleeve is surrounded by the vacuum chamber. The bit supporting sleeve is journaled by a bearing between a forward end part and a rear end part of the bit supporting sleeve. The bit supporting sleeve includes at least one longitude vacuum passage extending from its rear end part to its forward end part.