Hydraulic Power Unit Handle Controls for Jack Stand Alignment
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Solution Overview
Problem
Existing commercial two-part jacking systems face design challenges such as shifting lift plates, unreliable locking mechanisms, excessive pivotal travel of hydraulic rams, difficult handle control, and manufacturing issues with lift arms and slide-forward bridges, leading to inefficiencies and durability problems.
Innovation Solution
The system incorporates a self-aligning jack stand with a dual locking mechanism, improved handle controls, and a robust power unit design featuring a hydraulic cylinder with actuator pistons and a control valve, along with a two-position bridge and automatic-slide-forward-bridge assembly, all fabricated from heavy-duty materials to enhance manufacturability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional lifting plate design is used, then the power unit can lift loads, but the lift plate shifts during lifting operations
Solution Approach 1:
The lift plate is divided into multiple segments that can independently adjust and lock into position. This segmentation allows each section to stabilize independently, preventing overall plate shifting during lifting operations while maintaining load-bearing capability.
Solution Approach 2:
The lift plate incorporates preliminary alignment features and pre-positioning mechanisms that ensure proper positioning before lifting begins. This preliminary action prevents shifting during the actual lifting process by establishing stable contact points in advance.
2Device complexity
If a simple locking mechanism is used, then the device structure remains simple, but the locking mechanism becomes unreliable
Solution Approach 1:
Multiple locking functions are merged into a single integrated locking mechanism that combines mechanical engagement, hydraulic actuation, and safety interlocks. This unified approach maintains structural simplicity while achieving high reliability through redundant locking actions.
Solution Approach 2:
The locking mechanism includes preliminary engagement stages and safety buffers that activate before complete locking occurs. This beforehand cushioning ensures that if one locking element fails, backup elements are already engaged, preventing catastrophic failure while maintaining a relatively simple overall structure.
3Quantity of substance
If the power unit is designed for carrying multiple jack stands, then jack stand capacity increases, but the power unit becomes useless until another jack stand is available
Solution Approach 1:
The power unit is designed with universal capabilities to handle both jack stands and direct load lifting through an integrated bridge mechanism. This multi-functionality allows the power unit to remain productive whether carrying jack stands or directly lifting loads, eliminating downtime while waiting for jack stand availability.
Solution Approach 2:
A bridge mechanism serves as an intermediary component that enables direct load lifting when jack stands are unavailable. This mediator allows the power unit to maintain productivity by transferring loads directly through the bridge, bypassing the need for jack stands temporarily while preserving the ability to use jack stands when available.
4Device complexity
If manual control operations are used, then the control system remains simple, but the handle control becomes difficult to operate
Solution Approach 1:
Hydraulic actuation is integrated into the manual control system, allowing the operator to control heavy lifting and locking functions through simple handle movements that translate to powerful hydraulic actions. This reduces the physical effort required while maintaining a relatively simple control structure without electronic complexity.
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 solution provides a robust, reliable, and durable commercial lifting system with improved alignment, locking, and control features, enabling efficient and stable operation, extended lifespan, and ease of use and storage.
Implementation Method 1
The stands are capable of being vertically extended and retracted from the garage floor or road surface and, when extended, can be locked in place at a desired position by a ratchet and pawl assembly.
Implementation Method 2
The power unit has a wheeled mobile chassis adapted to carry a plurality of the jack stands, and has a pair of lift arms adapted to mate with the outermost jack stand for placement and removal.
Data Source
AI summary
A handle and control mechanism on a mobile power unit for positioning extending, retracting and extracting a jack stand. The jack stand includes an alignment hole and a pair of ratchet release arms at the lower sides. The power unit includes a frame having a forward end with separated extensions for supporting the jack stand, and a rearward end having a tubular handle with a T bar hand grip with an operating lever on the right side. The handle has a rotatable control knob extending through the T bar hand grip for controlling a valve on a hydraulic cylinder. The forward extensions have an alignment block and pin for engaging the alignment hole of the stand. A pair of rectangular flippers are pivotally mounted at the inner rearward corners of the pin blocks, and have the outer rearward corners linked to the operating lever. The flippers have arcuate inner edges which are engageable with the ratchet release arms, have outer edge tabs that are engageable to retract the alignment pins, and are selectively controlled by the operating lever.