Telescopic Manhole Pin With Spring Articulation

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Solution Overview

Problem

Existing manhole closing devices require breaking the concrete seal to install the articulation bolt, necessitating additional concrete filling, which is inefficient and disruptive.

Innovation Solution

A telescopic pivot pin with a compression coil spring and cotter pin mechanism allows the pin to extend and engage with blind holes in the frame without disturbing the concrete seal, enabling secure installation without breaking the seal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a traditional articulation bolt is used to connect the panel to the frame, then the panel can be securely mounted, but the concrete seal surrounding the frame must be broken and refilled during installation

Engineering Contradiction:

Improvesecure mounting of panelVSAvoidinstallation process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The articulation bolt is segmented into two parts: a first part fixed to the panel and a second part fixed to the frame. These separate components can be installed independently through the concrete seal without breaking it, as each part fits into its own designated opening or recess.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first part of the articulation bolt is nested within a recess formed in the concrete seal, while the second part extends through the seal. This nesting arrangement allows both parts to be accommodated within the sealed structure without requiring breakage of the concrete.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Strength

If the articulation bolt passes through the side walls of the frame housing, then secure connection is achieved, but the concrete seal must be broken to accommodate the bolt

Engineering Contradiction:

Improveconnection strengthVSAvoiddamage to concrete seal

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

Instead of requiring the bolt to pass through the entire concrete seal, the solution creates localized features: a recess in the seal for the first part and a specific opening for the second part. This local modification approach maintains the overall integrity of the concrete seal while providing secure connection points.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The recess and opening are prepared in advance in the concrete seal design, allowing the articulation bolt parts to be installed without breaking the seal during the mounting process. The seal is pre-configured to accommodate the connection components.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If the articulation bolt requires breaking the concrete seal for installation, then the bolt can be installed, but additional concrete filling is required which is time-consuming and disruptive

Engineering Contradiction:

Improveinstallation simplicityVSAvoidinstallation time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The concrete seal is designed with pre-formed recesses and openings that accommodate the articulation bolt parts. This preliminary preparation eliminates the need for breaking and refilling concrete during installation, significantly reducing installation time and disruption.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The problematic step of breaking and refilling concrete is extracted from the installation process. The articulation bolt system is designed to work with the intact seal by using recesses and openings, completely removing the time-consuming concrete repair operations.

Inventive Principle:

Principle #2Taking out (Extraction)

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

Facilitates the installation of the panel on the frame without damaging the concrete seal, maintaining the integrity of the seal and simplifying the installation process.

Implementation Method 1

a spring positioned between both telescopic parts so as to engage and hold the two ends of the pivot pin in two blind holes of the frame

Methodology Applied

Scientific EffectCompression coil spring: Spring

Data Source

PatentUS8057123B2Device for a pavement manhole with a support frame for closing a panel hinged on the frame using permanent articulation means

Publication Date: 2011.11.15 NORINCO SA

AI summary

The present invention relates to a device for a pavement manhole with a support frame, for closing a panel hinged on the frame using permanent articulation means. The device is characterized in that the pivot axis (8) includes a pin made of at least two parts (13, 14) telescopically mounted into each other and spaced from each other by a spring (15) provided between the two telescopic parts (13, 14) so as to engage and hold the two ends of the pin (8) respectively in two blind holes (20) of the frame. The invention can be used in road equipment.