Support Frame Socket Pin Planar Contact Load Capacity
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Solution Overview
Problem
Existing support devices with round socket pins and insertion openings suffer from high surface pressure leading to material deformation and insufficient load capacity, which cannot be effectively increased without compromising the carrier's strength and weight.
Innovation Solution
The design incorporates socket pins with at least two parallel bearing surfaces and insertion openings with complementary planar contact surfaces, allowing for improved load transfer and increased load capacity without material deformation, using rectangular, square, or polygonal geometries that enhance the section modulus and shear area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If round socket pins with linear contact are used in round insertion openings, then ease of insertion is improved, but surface pressure becomes very high causing material deformation and insufficient load capacity
Solution Approach 1:
The patent transitions from linear contact (point/line contact between round pin and round opening) to planar contact (surface contact between flat contact surfaces). This dimensional change from 1D to 2D contact area dramatically reduces surface pressure while maintaining ease of insertion, as the flat contact surfaces distribute the load over a larger area.
Solution Approach 2:
The patent changes the geometric parameters of the socket pin and insertion opening from circular cross-sections to flat contact surfaces with complementary geometries (e.g., triangular, rectangular, or polygonal). This parameter change transforms the contact mechanism from high-pressure linear contact to low-pressure planar contact, increasing load capacity without compromising ease of insertion.
2Strength
If the cross section of the socket pin is increased to increase load capacity, then load capacity is improved, but material requirements and overall weight increase
Solution Approach 1:
The patent changes the contact geometry from circular to flat surfaces with complementary shapes. This parameter change allows the same load capacity to be achieved with smaller cross-sectional dimensions, as the planar contact provides superior load distribution. Consequently, the carrier tubes can be smaller in diameter, reducing material requirements and weight.
Solution Approach 2:
By transitioning to planar contact surfaces, the patent achieves more efficient load transfer in the contact plane, eliminating the need for increased cross-sectional area in the longitudinal direction. This dimensional optimization allows for lighter carrier construction while maintaining or improving load capacity.
3Strength
If square insertion openings with square socket pins are used, then load capacity is improved through increased section modulus, but manufacturing complexity increases
Solution Approach 1:
The patent adopts flat contact surfaces with complementary geometries (triangular, rectangular, or polygonal) that provide high section modulus and load capacity. While these geometries differ from simple circles, they can be efficiently manufactured using modern processes like laser cutting, press braking, or extrusion, making the manufacturing complexity manageable while achieving superior mechanical performance.
Data Source
Figure 1
Figure 2
Figure 3~6
AI summary
The jack stand (11) has a support frame (12) with struts (14) for a guide (21). The carrier (22) is inserted into the guide, to be secured at the required height by a bolt (27) through an opening (26). The bolt opening has a laying surface (29) and the bolt has a laying surface, pressed together by pressure from the load bearing plate (23).