Synchronized Claw Puller with Extensible Abutting Assembly

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Solution Overview

Problem

Conventional pullers for removing annular elements from axles are inefficient due to independent claw operation, potential accidental disengagement hazards, and limited stroke lengths, requiring multiple phases for detachment.

Innovation Solution

A puller design featuring a collar with pivotal claws, a synchronizer, and an abutting assembly, where the synchronizer synchronizes claw movement and an extensible abutting assembly provides a long stroke for efficient detachment, ensuring safe and convenient operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pullers with independent claws are used, then the structure is simple, but the claws may accidentally disengage from the annular element causing safety hazards

Engineering Contradiction:

Improveclaw engagement reliabilityVSAvoidclaw connection structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent connects multiple claws through a common shaft, merging their operation so they move simultaneously and remain synchronized during the pulling process. This prevents accidental disengagement of individual claws while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shaft acts as an intermediary element that transmits motion uniformly to all claws, ensuring they operate in unison. This mediator component coordinates the claws' movement without requiring complex individual control mechanisms for each claw.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Length of moving object

If a threaded rod is used to provide long stroke, then the stroke length is sufficient, but the rotation operation to extend the rod is inefficient

Engineering Contradiction:

Improvestroke lengthVSAvoidrod extension operation

Core Design Contradiction:

Length of moving objectVSEase of operation

Solution Approach 1:

The patent replaces the threaded rod's rotational extension mechanism with a direct linear extension mechanism. The abutting element extends linearly along the axial direction without requiring rotation, significantly improving operational efficiency while maintaining sufficient stroke length.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Speed

If a hydraulic device with piston rod is used, then the extension speed is fast, but the stroke length is short requiring multiple phases

Engineering Contradiction:

Improveextension speedVSAvoidstroke length

Core Design Contradiction:

SpeedVSLength of moving object

Solution Approach 1:

The patent combines the advantages of both threaded rods and hydraulic devices by using a hydraulic device for fast extension speed while incorporating a long-stroke abutting element that extends linearly. This merged approach achieves both high speed and sufficient stroke length in a single phase operation.

Inventive Principle:

Principle #5Merging (Combining)

4Length of moving object

If multiple phases are used for detachment, then the stroke length requirement is met, but the operation time and complexity increase

Engineering Contradiction:

Improveeffective stroke lengthVSAvoiddetachment operation time

Core Design Contradiction:

Length of moving objectVSLoss of time

Solution Approach 1:

The patent enables continuous single-phase detachment operation by providing an abutting element with sufficient stroke length that can complete the entire detachment process without interruption. The claws and abutting element work continuously in unison from initial engagement to complete detachment, eliminating the need for multiple phases and reducing operation time.

Inventive Principle:

Principle #20Continuity of useful action

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 puller achieves efficient and safe detachment of annular elements with a single long stroke operation, reducing the number of phases required and minimizing user risk through synchronized claw movement and extended reach.

Implementation Method 1

The synchronizer is used to synchronize the pivoting of the claws. Each of the claws includes a protuberance movable in a corresponding one of the slots. The synchronizer includes a receiving portion for receiving the protuberances.

Methodology Applied

Scientific EffectMechanical synchronization through protuberance-receiving mechanism: Mechanical Advantage

Implementation Method 2

The abutting assembly is extensible from the collar... the abutting assembly provides a long stroke for efficient detachment

Methodology Applied

Scientific EffectMechanical extension and linear motion: Mechanical Advantage

Implementation Method 3

The collar includes slots in communication with the space... Each of the claws includes a protuberance movable in a corresponding one of the slots

Methodology Applied

Scientific EffectMechanical guidance through constrained linear motion: Guided Rotor Compressor

Data Source

PatentUS20220152800A1puller

Publication Date: 2022.05.19 CHEN YI FANG

AI summary

A puller includes a collar, claws, a synchronizer and an abutting assembly. The collar includes slots and pivotal connectors located corresponding to the slots. The claws are pivotally connected to the pivotal connectors. Each of the claws includes a protuberance movable in a corresponding one of the slots. The synchronizer includes a receiving portion for receiving the protuberances. The synchronizer is movable in the collar between an opening position and a closing position. In the opening position, the synchronizer opens the claws by the protuberances. In the closing position, the synchronizer closes the claws by the protuberances. The synchronizer is extensible from the collar.