Pushblock Center Tunnel and Compressible Heel for Saw Alignment

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Solution Overview

Problem

Conventional pushblocks require precise positioning and rotational alignment with the workpiece, which can lead to damage, reduced control, and safety hazards due to improper placement, and the center leg is susceptible to saw blade damage.

Innovation Solution

A pushblock with a compressible heel that can conform to the workpiece's corner without exact alignment, featuring a flexible heel that adjusts to different angles and a center leg with a tunnel to reduce saw blade risk.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixed heel is used in conventional pushblocks, then the heel provides push force through physical interference, but the pushblock requires precise positioning and rotational alignment with the workpiece

Engineering Contradiction:

Improvepush force generationVSAvoidpositioning and alignment

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The heel is made compressible rather than fixed, allowing it to dynamically adjust its position and shape during operation. The compressible heel can yield and conform to different workpiece corners, eliminating the need for precise positioning and rotational alignment while maintaining effective push force generation through physical interference

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The heel's physical parameters (shape, position, compression level) are changed during operation to adapt to different workpiece geometries. The heel can be compressed to different degrees and assumes different shapes based on the workpiece corner it contacts, providing versatility without requiring precise initial alignment

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If a fixed heel is improperly positioned on top of the workpiece, then the pushblock tilts forward at an angle, but this reduces control and compromises operator safety

Engineering Contradiction:

Improveheel structureVSAvoidcontrol and safety

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The compressible heel dynamically adjusts its position during operation, allowing the pushblock to self-correct and maintain proper alignment with the workpiece. Even if initially misplaced, the heel can yield and reposition itself to prevent forward tilting, maintaining control and safety without requiring complex adjustment mechanisms

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The compressible heel acts as a cushioning element that can absorb positioning errors before they lead to dangerous tilting. The heel's compliance provides a buffer zone that prevents the pushblock from becoming unstable, even when initial positioning is not precise

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Stability of the object's composition

If a center leg is used in pushblocks, then the pushblock provides stability, but the center leg is susceptible to damage by the saw blade

Engineering Contradiction:

Improvepushblock stabilityVSAvoidsaw blade damage risk

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The vulnerable solid center leg material is extracted and replaced with a tunnel (empty space). This removes the vulnerable element that could be damaged by the saw blade while maintaining the structural framework needed for stability. The tunnel allows the saw blade to pass through without contacting solid material

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The center leg structure is transformed into a thin-walled tunnel configuration. The tunnel walls are sufficiently thin to minimize exposure to saw blade damage while maintaining enough structural integrity to provide stability. The hollow structure reduces the amount of vulnerable material present

Inventive Principle:

Principle #30Flexible shells and thin films

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

Enhances operational efficiency and safety by allowing flexible positioning and reducing the risk of damage to the pushblock and center leg, while maintaining effective control over the workpiece.

Implementation Method 1

a compressible heel that can conform to the workpiece's corner without exact alignment, featuring a flexible heel that adjusts to different angles

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

Frictional contact between the top surface and a bottom surface of the pushblock allows the user to advance the workpiece across a worktable

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12570023B1Pushblock with center tunnel

Publication Date: 2026.03.10 WANG HENRY

AI summary

A woodworking pushblock (500), including: a body (502) that extends along a longitudinal axis (508) and handle (504) disposed atop the body. The body includes first leg (506A), a second leg (506B), and a center leg (506C) disposed therebetween. The first leg, the second leg, and the center leg are each configured to abut a top of a workpiece. The first leg and the second leg define a first tunnel (520A) therebetween. The second leg and the center leg define a second tunnel (520B) therebetween. The center leg defines a center tunnel (520C) recessed into a bottom surface (506CBS) thereof and disposed between the first tunnel and the second tunnel.