Reciprocating Saw Battery Strike Plate Vibration Management

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Solution Overview

Problem

Cordless reciprocating saws experience battery pack ejection due to sustained vibrational forces, which overcome the attachment features, leading to detachment during operation.

Innovation Solution

A mechanical interface with a strike plate and engagement arm angled at 15 degrees to the latch, preventing the battery pack from detaching by countering vibrational forces and reducing wear on the latch.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a latch and catch combination is used to attach the battery pack, then the battery pack can be securely held during operation, but sustained vibrational forces can overcome the attachment feature and cause the battery pack to be ejected

Engineering Contradiction:

Improvebattery pack attachment reliabilityVSAvoidvibrational forces

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The strike plate converts the harmful vibrational forces into a beneficial mechanism by using the vibration-induced movement of the battery pack against the angled engagement arm to press the latch deeper into the catch, thereby strengthening the attachment during operation rather than allowing detachment

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The engagement arm is configured at an asymmetric angle (15 degrees) to the latch forward facing surface, creating a non-uniform contact geometry that prevents the latch from disengaging under vibrational forces while allowing easy insertion of the battery pack

Inventive Principle:

Principle #4Asymmetry

2Ease of operation

If the engagement arm is perpendicular to the latch surface, then the latch can engage easily, but vibrational forces can cause the battery pack to detach

Engineering Contradiction:

Improvebattery pack insertion easeVSAvoidbattery pack retention during operation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS11000941B2Reciprocating saw

Publication Date: 2021.05.11 BLACK & DECKER CORP

AI summary

The present disclosure is directed to a cordless reciprocating saw including a mechanical interface for attaching a removable battery pack. The mechanical interface includes a strike plate to reduce the effects of vibrational forces on the battery pack.