Self-Aligning Pneumatic Framing Tool Bumper for Bolt-Sparing Repair
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Solution Overview
Problem
Existing pneumatic framing tools face challenges in maintaining the longevity of bolts and reducing impact forces on components due to the design of traditional bumpers that require removal through the nose, leading to potential damage and increased wear.
Innovation Solution
A self-aligning bumper design with a tiered ring shape and retaining alignment protrusions allows for insertion and removal through the top end of the housing, eliminating the need to remove bolts, and features an external concentric ring that does not fill the annular impact cavity, reducing impact forces on the housing and bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If traditional bumpers are removed through the nose, then the bumper can be replaced, but the bolts may be damaged and wear increases
Solution Approach 1:
The bumper removal path is inverted from the traditional method. Instead of removing the bumper through the nose (front), the bumper is removed through the rear opening of the housing. This reversal allows bumper replacement without disturbing the bolts that secure the nose, thereby preventing bolt damage and reducing wear while maintaining ease of repair
2Reliability
If traditional bumpers fill the annular impact cavity, then the bumper provides impact absorption, but impact forces are transmitted to the housing and bolts
Solution Approach 1:
The bumper design extracts the impact-absorbing function from the annular impact cavity. The bumper is designed with a diameter smaller than the annular impact cavity, creating a gap between the bumper and the cavity walls. This allows the bumper to absorb impact forces through its material properties without transmitting these forces to the housing and bolts, as the bumper does not fill or contact the cavity structure during impact events
3Strength
If the bumper is secured with bolts through the nose, then the bumper is firmly attached, but removal requires bolt removal causing complexity
Solution Approach 1:
The attachment and removal methodology is inverted. The bumper is attached through the rear opening of the housing using a press fit or interference fit mechanism, eliminating the need for bolts through the nose. Removal is achieved by accessing the same rear opening, allowing the bumper to be pulled out without disturbing any fasteners. This maintains strong attachment while simplifying the removal procedure to a single-step process
Data Source
AI summary
A pneumatic framing tool includes a housing with an axis of symmetry X, a nose with a tubular portion centered about the axis X and secured to the housing by at least one bolt, a sleeve disposed within the housing, a piston driver disposed within the sleeve having a base portion centered about axis X and a tubular portion that extends from the base portion along the axis X into the tubular portion of the nose, and a bumper disposed within the sleeve such that the tubular portion of the piston driver extends through a center of the bumper along axis X. The bumper include a plurality of retaining alignment protrusions that align the bumper in the sleeve and an external concentric ring that rests between the sleeve and the nose and allows for removal of the bumper without removing the bolts and the nose from the tool.