Anti-rotation Target Assembly for Pinball Game Devices

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Solution Overview

Problem

Traditional pinball targets in amusement game devices often become misaligned due to repetitive impacts, leading to inconsistent gameplay and increased maintenance needs.

Innovation Solution

An anti-rotation target assembly featuring a U-shaped shell that houses the switch stack, utilizing stiffening leaf springs and a deflection stop to maintain component alignment, reducing the need for external alignment aids and frequent operator adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If traditional vertical targets are used in amusement game devices, then the target can be simply constructed and easily mounted, but the target becomes misaligned or moves from its intended playfield location over time due to repetitive impacts

Engineering Contradiction:
Improvetarget construction simplicityVSAvoidtarget alignment consistency
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The target assembly is divided into separate functional components: a target body for receiving impacts, a mounting bracket for attachment to the playfield, and an anti-rotation shell for stabilization. This segmentation allows each component to be optimized independently while working together to prevent misalignment.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The anti-rotation shell acts as an intermediary component between the target body and the mounting bracket. It receives rotational forces from impacts and transfers them to the mounting structure, preventing the target body from rotating or misaligning while maintaining a simple overall construction.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Device complexity

If traditional vertical targets are used, then the device complexity is low, but frequent playfield maintenance and operator adjustments are required to maintain alignment

Engineering Contradiction:
Improvetarget assembly structureVSAvoidplayfield maintenance frequency
Core Design Contradiction:
Device complexityVSEase of repair

Solution Approach 1:

The anti-rotation shell is pre-installed on the mounting bracket before the target body is attached. This preliminary stabilization prevents rotational movement from occurring during gameplay, eliminating the need for frequent maintenance adjustments and reducing operator intervention requirements.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The anti-rotation shell provides self-aligning functionality by automatically counteracting rotational forces generated during play. The structure serves itself by using the impact forces to engage the anti-rotation mechanism, eliminating the need for external alignment aids or frequent manual adjustments.

Inventive Principle:
Principle #25Self-service

3Reliability

If the target is made more robust to prevent rotation, then alignment consistency improves, but the device complexity and number of components increases

Engineering Contradiction:
Improvetarget alignment stabilityVSAvoidtarget assembly components
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The anti-rotation shell is constructed as a thin-walled structure that provides sufficient rotational resistance through its geometric configuration rather than material thickness. The shell's shape and positioning create the necessary stabilizing effect while minimizing added complexity and component bulk.

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

The anti-rotation target assembly effectively minimizes component movement and misalignment, ensuring consistent gameplay with reduced maintenance requirements by securely housing the switch stack within the anti-rotation shell.

Implementation Method 1

utilizing stiffening leaf springs and a deflection stop to maintain component alignment

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

A anti-rotation target assembly featuring a U-shaped shell that houses the switch stack

Methodology Applied
Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS12157065B1Anti-rotation target assembly for an amusement game device
Publication Date: 2024.12.03 STERN SRL
  • US12157065B1 patent drawing
  • US12157065B1 patent drawing
  • US12157065B1 patent drawing

AI summary

A target assembly for an amusement device includes a switch stack comprising a target leaf spring, a contact leaf spring, and a spacer electrically isolating the target leaf spring from the contact leaf spring. An anti-rotation shell is mounted to the switch stack and at least partially surrounds one end of the target leaf spring and the contact leaf spring. The anti-rotation shell is sized and configured to substantially prevent relative movement between the target leaf spring and the contact leaf spring. In some examples, a switch mount bracket includes slot to receive side walls of the anti-rotation shell.