Reciprocating Saw Scraper Blade Spindle Attachment Design
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Solution Overview
Problem
Reciprocating saw accessories, such as scraper blades, face challenges in withstanding bending loads and stresses during operation, leading to potential fracture and reduced durability.
Innovation Solution
The scraper blade design includes an attachment portion with radii that contact the spindle, distributing bending loads and increasing strength, and features like tang members and apertures for secure attachment, along with a cutting edge configuration for effective material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the scraper blade uses a conventional attachment design, then it can be easily manufactured and attached, but it cannot withstand bending loads and stresses, leading to potential fracture
Solution Approach 1:
The attachment portion incorporates radii (curved surfaces) that contact the spindle, distributing bending loads across curved contact surfaces rather than concentrated points. This curvature allows the attachment portion to better withstand bending stresses while maintaining a relatively simple overall structure
Solution Approach 2:
The attachment portion is divided into multiple functional elements including tang members for attachment, radii for load distribution, and apertures for securing. This segmentation allows each element to perform its specific function optimally while contributing to the overall strength without excessive complexity
2Ease of manufacture
If the scraper blade design is simplified for easy manufacture, then manufacturing cost decreases, but the blade becomes more susceptible to fracture under bending loads
Solution Approach 1:
The radii in the attachment portion are designed with standard curvature profiles that can be efficiently manufactured using conventional machining processes. The curved surfaces distribute stresses naturally, providing fracture resistance without requiring complex geometric features or multiple manufacturing steps
3Strength
If the attachment portion contacts the spindle at multiple points, then bending loads are distributed and strength increases, but the complexity of the attachment portion increases
Solution Approach 1:
The radii create curved contact surfaces that naturally distribute loads across multiple contact points with the spindle. The curvature geometry achieves load distribution through its shape alone, without requiring additional complex structural elements or mechanisms
Data Source
AI summary
An accessory configured for use with a reciprocating saw having a spindle. The accessory is configured to reciprocate with the spindle. The accessory includes an attachment portion having a tang including a first tang member and a second tang member and an aperture that extends through the attachment portion from a first broad side to a second broad side. The attachment portion also includes a first radius, which terminates to define a projection, located on a first narrow side. The attachment portion also includes a second radius, which terminates to define a projection, located on a second narrow side. The first radius and the second radius are configured to contact an exterior of the spindle.