Depth Stop Device Axial Locking Mechanism
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Solution Overview
Problem
Existing depth stop devices for screw driving tools are costly due to numerous resilient elements, leading to excessive wear and a short service life, and lack stable axial and rotational locking mechanisms for reliable depth setting.
Innovation Solution
A depth stop device with a separate, partially elastic locking element that engages both the adjusting ring and connection sleeve, featuring a U-shaped locking element and a circumferential groove for simplified and stable mounting, reducing wear and manufacturing costs, and providing both axial and rotational securing means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If numerous resilient elements are used in the adjusting ring to secure axial and rotational positioning, then reliable depth setting is achieved, but manufacturing cost increases and service life decreases due to excessive wear
Solution Approach 1:
The patent extracts the resilient elements from the adjusting ring and relocates them to the connection sleeve. Specifically, the connection sleeve is provided with resilient arms that extend radially outward, while the adjusting ring has corresponding recesses. This separation allows the adjusting ring to be simpler and less expensive while maintaining reliable axial and rotational securing through the cooperative engagement of the resilient arms with the adjusting ring features.
Solution Approach 2:
The securing function is segmented between two separate components: the connection sleeve provides the resilient arms, while the adjusting ring provides the recesses and positioning features. This segmentation allows each component to be optimized independently, reducing the overall complexity and cost while maintaining the reliable depth setting function through their coordinated interaction.
2Stability of the object's composition
If resilient elements are integrated into the adjusting ring for axial and rotational securing, then stable mounting is achieved, but manufacturing cost increases
Solution Approach 1:
The resilient elements are extracted from the adjusting ring and transferred to the connection sleeve. The connection sleeve is provided with resilient arms that can be formed as separate features, while the adjusting ring contains corresponding recesses. This extraction simplifies the adjusting ring design, reducing manufacturing cost while the connection sleeve's resilient arms maintain the stability of mounting through their elastic engagement with the adjusting ring.
3Reliability
If multiple resilient elements are used to prevent rotation and secure axial position, then reliable depth stop setting is achieved, but service life decreases due to excessive wear
Solution Approach 1:
The resilient elements are extracted from the adjusting ring and relocated to the connection sleeve. This redistribution reduces the number of resilient elements that undergo repeated engagement and disengagement during depth adjustment operations. The connection sleeve's resilient arms engage with the adjusting ring's recesses to prevent rotation and secure axial position, but with fewer elements and optimized positioning, the wear is reduced, extending the service life of the rotationally securing means while maintaining reliable depth stop setting.
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
The solution results in a cost-effective, durable depth stop device with stable axial locking and reliable preset position setting, reducing component count and wear, while ensuring precise drive-in depth adjustment.
Implementation Method 1
axially securing means that includes a separate, from the adjusting ring and the connection sleeve, at least partially elastic locking element engageable in the axial direction with both the adjusting ring and the connection sleeve
Data Source
AI summary
A depth stop device for a screw driving tool includes an adjusting ring (30), a connection sleeve (22) for rotatably mounting the adjusting ring (30) on the nose member (6) of the screw driving tool housing (4), a substantially sleeve-shaped depth stop (36) displaceable in an axial direction relative the connection sleeve (22) by rotation of the adjusting ring (30), and at least partially elastic locking element (40) engageable in the axial direction with both the adjusting ring (30) and the connection sleeve (22), the locking element being also adapted to secure the adjusting ring (30) on the connection sleeve (22) in a rotational direction (D).