Telescopic Holder Overload Protection Mechanism
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Solution Overview
Problem
Existing telescopic carriers are limited in their ability to lift heavier loads due to the risk of overloading and damage to components in the power transmission path, lacking effective overload protection.
Innovation Solution
A telescopic carrier with an integrated overload protection device that includes a reduction gear and a pawl mechanism, allowing the components to rotate relative to each other when an overload is detected, preventing damage, and featuring latching tongues and locking receptacles to define a limit force for triggering the overload protection, enabling safe lifting of heavier loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the telescopic carrier is designed to lift heavier loads, then the lifting capacity is improved, but the risk of overloading and damage to components in the power transmission path increases
Solution Approach 1:
The patent implements an overload protection device with overload safety bodies (first and second overload safety bodies) that are positioned in advance in the power transmission path between the actuating element and the actuating gear wheel. These bodies can rotate relative to each other when a predetermined limit force is exceeded, allowing the system to withstand overloads without damaging critical components. This beforehand cushioning enables the telescopic carrier to safely lift heavier loads while protecting against component damage.
2Reliability
If an overload protection device is added to prevent component damage, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The overload safety bodies serve multiple functions: they are part of the power transmission path (transmitting force from the actuating element to the actuating gear wheel) and simultaneously provide overload protection (rotating relative to each other when limit force is exceeded). This multi-functionality integrates the protection mechanism into the existing structure without adding separate complex subsystems, thereby improving reliability while minimizing increased device complexity.
3Ease of operation
If a reduction gear is implemented to reduce actuation effort, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The actuating gear wheel serves dual purposes: it is the driven element in the power transmission path (receiving force from the overload safety bodies) and simultaneously functions as a reduction gear (interacting with the toothed rack to provide mechanical advantage). This integration allows the reduction gear functionality to be embedded within the existing actuation mechanism, reducing actuation effort for children while avoiding the need for a separate, complex reduction gear subsystem.
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
Enables the safe lifting of heavier loads by preventing component damage through the overload protection mechanism, allowing children to easily manipulate the telescopic carrier, particularly in toy assemblies like crane trucks, while maintaining cost-effectiveness and efficient operation.
Implementation Method 1
Snap-in tongues according to claim 5 lead to a component that can be manufactured at low cost. In addition, such latching tongues can be manufactured with a comparatively small amount of material with a restoring force necessary to fulfill their function.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The telescopic jib (6) has a rotatable overload fuse body comprising a set of elastic snap-in pins that is arranged spaced apart from a rotational axis of the fuse body. Another rotatable overload fuse body has a set of locking recesses assigned complementary to the snap-in pins. The snap-in pins are disengaged from the locking recesses by the fuse bodies during an overload in a force transmission path between an actuating element (10) and an actuating toothed wheel so that a rotary joint between the fuse bodies is reversed to rotate the fuse bodies relative to each other. An independent claim is also included for a toy assembly comprising a telescopic jib.