Nut Socket Unit With Freely Rotating Maneuver Sleeve
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Solution Overview
Problem
Existing nut socket units pose safety risks due to the co-rotation of the maneuver sleeve with the nut socket, which can cause operator injuries, and the protruding front part may entangle with gloves or objects, leading to potential harm during tightening operations.
Innovation Solution
A nut socket unit design featuring a rotatable nut socket body with an external maneuver sleeve that is freely rotatable relative to the socket body, combined with a protective sleeve at the front end to prevent tangling and injury, and an arresting mechanism that includes balls or a lock pin for secure attachment to a power wrench output shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maneuver sleeve is fixed to co-rotate with the nut socket, then the locking mechanism is simple and reliable, but operator safety is compromised due to injury risks from co-rotation and glove entanglement
Solution Approach 1:
The device is divided into two independently rotatable components: the nut socket body and the outer sleeve. This segmentation allows the outer sleeve to be freely rotatable relative to the nut socket body, preventing force transmission to the operator's hand while maintaining the locking function through the arresting mechanism. The segmentation resolves the contradiction by isolating the harmful rotational force from the operator.
Solution Approach 2:
The freely rotatable outer sleeve acts as an intermediary between the operator's hand and the locking mechanism. It allows the operator to manipulate the maneuver sleeve for locking/unlocking operations without being subjected to the rotational forces generated during tightening, thus mediating between operational control and safety.
2Ease of operation
If the front part of the nut socket protrudes to engage screw joints, then the tightening function is effective, but glove entanglement and injury risks increase
Solution Approach 1:
The front protective sleeve is segmented as a separate component that covers the protruding front part of the nut socket. This protective sleeve can be freely rotated relative to the nut socket body, allowing the protruding engagement surfaces to perform their tightening function while the protective sleeve prevents glove entanglement by providing a smooth, non-catchable outer surface.
3Ease of operation
If the maneuver sleeve is made accessible for easy manipulation, then ease of operation is improved, but exposure to rotational forces and injury risk increases
Solution Approach 1:
The outer sleeve is designed with dynamic freedom to rotate independently on the nut socket body. This dynamic characteristic allows the operator to easily manipulate the maneuver sleeve for locking and unlocking operations, while during the actual tightening process, the independent rotation capability prevents the transmission of rotational forces to the operator's hand, thus protecting against injury.
Data Source
Figure 1~6
AI summary
A nut socket unit for power wrenches, comprising a tubular socket body (10;50) with a front end portion (13;53) adapted for engagement with a screw joint, and a rear end portion (11;51) adapted for connection to a power wrench output shaft, and an arresting mechanism (15;55) for locking the socket body (10;50) to a power wrench output shaft, wherein the arresting mechanism (15;59) includes an axially displaceable maneuver sleeve (19;59), wherein the maneuver sleeve (19;59) is freely rotatable relative to the socket body (10;50). At the front end portion (13;53) of the socket body (10;50) there is also provided a freely rotatable protective sleeve (30;70) for operator protective purposes.