Replaceable Wear-Compensating Segments for Lift Truck Clamp Arms

Solution Overview

Problem

Existing clamp pads on lift trucks experience significant wear on the lower portions, reducing their ability to grasp loads securely over time, leading to costly and time-consuming replacement of the entire pad rather than just the worn parts.

Innovation Solution

A wear-compensating assembly with detachable, individually replaceable segments featuring a strong, wear-resistant backing plate and grip-enhancing surface elements, allowing for easy replacement and reorientation of worn parts to maintain secure gripping capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the entire clamp pad is replaced when the lower portion wears out, then the secure gripping capability is restored, but the cost and time increase significantly

Engineering Contradiction:

Improvesecure gripping capabilityVSAvoidreplacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The clamp pad is divided into distinct segments: the upper clamp pad portion and the lower wear-compensating assembly. The lower assembly can be detached and replaced independently from the upper portion, allowing only the worn lower segment to be replaced rather than the entire clamp pad. This segmentation enables selective replacement of worn components while preserving functional upper portions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The upper clamp pad portion, which remains functional and unworn, is recovered and reused when the lower portion wears out. Instead of discarding the entire clamp pad, the system allows recovery of the still-serviceable upper portion and replaces only the worn lower wear-compensating assembly, reducing material waste and replacement costs.

Inventive Principle:

Principle #34Discarding and recovering

2Reliability

If the entire clamp pad is replaced when the lower portion wears out, then the secure gripping capability is restored, but the cost increases significantly

Engineering Contradiction:

Improvesecure gripping capabilityVSAvoidmaterial cost

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The clamp pad is divided into distinct segments: the upper clamp pad portion and the lower wear-compensating assembly. The lower assembly can be detached and replaced independently from the upper portion, allowing only the worn lower segment to be replaced rather than the entire clamp pad. This segmentation enables selective replacement of worn components while preserving functional upper portions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The upper clamp pad portion, which remains functional and unworn, is recovered and reused when the lower portion wears out. Instead of discarding the entire clamp pad, the system allows recovery of the still-serviceable upper portion and replaces only the worn lower wear-compensating assembly, reducing material waste and replacement costs.

Inventive Principle:

Principle #34Discarding and recovering

3Loss of time

If the lower portion of the clamp pad is made replaceable, then the replacement cost and time are reduced, but the device complexity increases

Engineering Contradiction:

Improvereplacement timeVSAvoidclamp pad structure

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The clamp pad is divided into distinct segments: the upper clamp pad portion and the lower wear-compensating assembly. The lower assembly can be detached and replaced independently from the upper portion, allowing only the worn lower segment to be replaced rather than the entire clamp pad. This segmentation enables selective replacement of worn components while preserving functional upper portions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wear-compensating lower portion is extracted as a separate, detachable assembly from the main clamp pad structure. This extracted lower assembly can be removed and replaced independently through a release mechanism, allowing maintenance without replacing the entire clamp pad or disassembling the complete assembly.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10377617B2Opposable clamp arms having replaceable lower portions

Publication Date: 2019.08.13 CASCADE CORPORATION

AI summary

An opposable clamp arm of a load handling device such as a lift truck attachment. An upper clamp pad portion may have a generally planar plate as a main member and may have a load-gripping face layer. A lower clamp pad assembly has a plurality of separately replaceable wear-compensating load-contacting elements mounted interchangeably on a backing plate attached to a stabilizer member of the clamp arm. The load-contacting elements may be secured to the backing plate by retainer bars fastened to the backing plate with flanges of the retainer bars overlapping margins of the load contact elements.