Tool Balancer Spring Preloading Adjustment Mechanism
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Solution Overview
Problem
Conventional balancers for tools require significant effort and inconvenient maneuvers to adjust spring preloading, often leading to unwanted movements and complex layouts, especially when using annular gear/endless screw couplings which are costly and space-intensive.
Innovation Solution
A balancer with an adjustment assembly featuring a fixed annular gear and a rotating plate with external and internal teeth sets, allowing for ergonomic adjustment of spring preloading without transmitting motion in the opposite direction, using a harmonic reduction gear mechanism that simplifies layout and reduces user effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If annular gear/endless screw coupling is used to prevent motion transmission in opposite direction, then reliability is improved, but device complexity and space occupation increase
Solution Approach 1:
A one-way clutch mechanism is introduced as an intermediary component between the adjustment knob and the spring. This clutch allows the clutch plate to rotate freely in the direction of spring winding but prevents reverse rotation, thereby blocking unwanted motion transmission without requiring complex gear sets. The intermediary mechanism simplifies the overall layout while maintaining reliability.
Solution Approach 2:
The patent extracts the motion blocking function from the traditional annular gear system and implements it through a standalone one-way clutch mechanism. This separation allows the adjustment assembly to have a simpler layout with elements operating on closer planes, reducing space occupation while maintaining the essential function of preventing reverse motion transmission.
2Reliability
If annular gear coupling is used to adjust preloading, then motion transmission control is improved, but manufacturing cost increases
Solution Approach 1:
The one-way clutch mechanism is a simpler, more cost-effective component compared to precision annular gear sets. It can be manufactured using standard machining processes and is suitable for mass production, thereby reducing manufacturing costs while maintaining adequate reliability for the application.
Solution Approach 2:
The one-way clutch serves as a cost-effective intermediary that provides motion control functionality without the high manufacturing cost of annular gear systems. It achieves the essential function of preventing reverse motion transmission at a lower manufacturing cost.
3Reliability
If mechanical holdback or extracted knob is used for adjustment, then prevention of opposite motion transmission is improved, but ease of operation deteriorates
Solution Approach 1:
The one-way clutch mechanism automatically performs the function of preventing reverse motion transmission without requiring operator intervention to engage or disengage it. The operator simply rotates the adjustment knob in the desired direction, and the clutch self-regulates the motion, eliminating the need for manual holdback engagement or knob extraction.
Solution Approach 2:
The clutch mechanism dynamically adapts to the operator's input: it allows free rotation in the spring-winding direction and automatically locks in the reverse direction. This dynamic behavior provides reliable motion control while maintaining ease of operation, as the system automatically adjusts to the operator's actions without requiring special maneuvers.
4Reliability
If distant plane elements are used in gear coupling, then motion control is improved, but space occupation increases
Solution Approach 1:
The one-way clutch mechanism integrates the motion control function directly into the adjustment assembly, merging previously separate components (clutch mechanism and adjustment knob) into a compact unit. This allows elements to operate on closer planes and reduces the overall space occupation of the balancer while maintaining effective motion control.
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 easy, ergonomic adjustment of spring preloading with minimal user effort, prevents unwanted movements, and simplifies the balancer's layout, making it cost-effective and suitable for various applications.
Implementation Method 1
a spring, typically spiral, which is wound about the rotation axis of the drum: unwinding the cable, with consequent rotation of the drum and descent of the tool, generates a constraining reaction of the spring, which balances (or exceeds) the weight of the tool itself
Implementation Method 2
using a harmonic reduction gear mechanism that simplifies layout and reduces user effort
Data Source
AI summary
A balancer for tools includes a rotary drum for winding and unwinding a cable; a return spring, which is wound around the rotation axis of the drum and is coupled thereto, for the development of an elastic reaction that contrasts the unwinding of the cable and is adapted to facilitate its rewinding; an adjustment assembly for adjusting the preloading of the spring.The adjustment assembly includes a fixed annular gear with an internal set of teeth; a circular ring with an external set of teeth, arranged inside the annular gear; and a plate which is arranged substantially coplanar inside the ring. In every angular position of the plate, the ring is kept pressed against the internal set of teeth for the transmission of motion from the plate to the ring and the consequent adjustment of the preloading of the spring.