Hand-Held Jack Slow-Down Mechanism for Controlled Lowering
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Solution Overview
Problem
Conventional jacks require complex structures and mechanisms to control the lifting and lowering of workpieces, making them unstable and difficult to maintain.
Innovation Solution
A hand-held jack with a slow-down device that includes a lift shaft, step clamps, a handle, and a slow-down mechanism using swing seats, shaft clamps, springs, and an eccentric push member to control the lifting and lowering of workpieces smoothly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional jack uses a complicated structure or mechanism to control lowering and height adjustment, then the workpiece can be lowered safely without impact, but the device complexity increases and maintenance becomes difficult
Solution Approach 1:
The jack is divided into two functional chambers: the first chamber contains the step clamp for lifting control, while the second chamber contains the swing seat with shaft clamp for lowering control. This segmentation allows each chamber to handle specific functions independently, achieving safe lowering without requiring a single complex mechanism.
Solution Approach 2:
The swing seat automatically swings between horizontal and inclined positions based on the lift shaft's movement direction. When lowering, the swing seat naturally transitions to the inclined position, causing the shaft clamp to engage the lift shaft and control the lowering speed without requiring external control mechanisms.
2Manufacturing precision
If a conventional jack uses a complicated mechanism for height adjustment, then precise height control is achieved, but the ease of operation decreases
Solution Approach 1:
The swing seat is designed to dynamically change its position based on operational needs. During lifting, it remains horizontal allowing free movement; during lowering, it swings to an inclined position to engage the shaft clamp. This dynamic adaptation enables precise height control during lowering while maintaining simple operation throughout.
3Ease of repair
If the jack structure is simplified for easier maintenance, then ease of repair improves, but the ability to control workpiece lowering without impact deteriorates
Solution Approach 1:
The lowering control function is extracted as a separate mechanism in the second chamber, independent from the lifting mechanism in the first chamber. The swing seat and shaft clamp form a self-contained lowering control system that can be maintained or repaired separately, simplifying overall maintenance while preserving reliable controlled lowering capability.
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 hand-held jack allows for simple, stable operation and easy maintenance by gradually lowering workpieces without excessive impact, using a straightforward mechanism to adjust height.
Implementation Method 1
A first spring is sleeved on the lift shaft against a first side of the step clamp for pushing a second side of the step clamp to abut against the partition
Implementation Method 2
The second spring is sleeved on the lift shaft. One end of the second spring is supported by the spacer, and the other end of the second spring is pressed against the side of the seat body of the swing seat
Implementation Method 3
The third spring is located in the second accommodating groove of the swing seat and is sleeved on the lift shaft. The third spring presses the restricting plate to lean against the spacer
Implementation Method 4
The eccentric push member has a rotor pivotally connected to the pivot portion of the swing seat. One end of the rotor has an eccentric portion that rests on the resisting portion of the restricting plate
Data Source
AI summary
A hand-held jack has a main body, including a frame on a grip, the frame having a shaft hole passing through a first chamber and a second chamber therein, a jacking member being fixed to a front end of the frame; and a slow-down device. The slow-down device includes a swing seat pushed by the first spring and mounted in the second chamber; at least one shaft clamp and at least one restricting plate urged by a third spring that are disposed in a first accommodating groove and a second accommodating groove of the swing seat for clamping a lift shaft; and an eccentric push member having an eccentric portion resting on the restricting plate and a push portion. When a workpiece is lifted by the hand-held jack, the slow-down device lowers the workpiece slowly.