Drawbar Safety Locking and Immobilization Mechanism
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Solution Overview
Problem
Existing drawbars with movable rods for coupling vehicles face safety issues due to rod displacement in case of cylinder failure, causing jolts and potential damage, and lack of immobilization when not in use, especially with longer drawbars that can hit the ground on potholes or bumps.
Innovation Solution
A drawbar with a safety device that automatically locks the movable rod in case of cylinder failure and an immobilization mechanism that raises the coupling end when not in use, using a locking assembly and immobilizer elements to prevent movement and ground contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drawbar is made movable to allow coupling and uncoupling operations, then the ease of operation is improved, but the reliability deteriorates due to potential failure of the cylinder and uncontrolled movement of the rod
Solution Approach 1:
The locking device is designed to automatically engage and lock the rod in position when the cylinder fails or loses pressure, preventing uncontrolled movement before it can cause damage. The locking mechanism with spring-loaded locking elements is pre-positioned to catch the rod if it moves unexpectedly.
Solution Approach 2:
The locking device acts as a safety backup that is already in place and ready to prevent harmful effects of cylinder failure. The spring-loaded locking elements are prepared to engage with the rod's locking surfaces, providing a cushioning effect against sudden uncontrolled movements.
2Adaptability or versatility
If the drawbar is made movable to allow adjustment of vehicle distance, then the adaptability is improved, but the stability deteriorates due to lateral and vertical swinging when not locked
Solution Approach 1:
The immobilization device is designed to automatically engage when the rod is in a specific position, preventing lateral and vertical swinging before it can cause damage. The locking elements are pre-positioned to catch and stabilize the drawbar when not in use.
3Adaptability or versatility
If the drawbar has a great length to extend from the front axle, then the adaptability is improved for various coupling configurations, but the harmful factors increase due to risk of hitting the ground on potholes or speed bumps
Solution Approach 1:
The immobilization device prevents the drawbar from moving downward to hit the ground by engaging locking elements that physically block the movement path. This preliminary anti-action counteracts the harmful effect of ground contact before it can occur.
4Ease of operation
If the locking device is made automatic to operate without energy, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The locking device is designed to be self-actuating, using the rod's own movement and spring-loaded elements to automatically engage and lock without requiring external energy or complex control systems. The mechanism serves itself by utilizing the mechanical energy already present in the system.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The drawbar (1) comprises a main cylinder (14) with a moving rod (15) equipped with a coupling ring (13) for coupling same to a second vehicle (5). The drawbar (1) comprises a latching device (16) with safety ratchet (19) which is automatically activated by latching in the event of failure of said main cylinder (14), in order to prevent the exit of the moving rod (15). The drawbar (1) is mounted to pivot with respect to the road vehicle (2) to which it is fitted and further comprises an immobilisation device (32) provided to prevent any pivoting of the drawbar (1) when the movable rod (15) of said drawbar (1) is in the retracted position.