Adjustable Blocking Pin for Telescopic Trailer Chassis
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Solution Overview
Problem
Existing trailers with length-adjustable chassis require multiple steps and frequent dismounting from the vehicle to adjust the length, as the blocking mechanism necessitates unlocking and relocking the pin in multiple holes, making the process cumbersome and time-consuming.
Innovation Solution
A trailer with a blocking mechanism featuring a blocking pin that is adjustable in both position and rotational orientation, allowing it to uniquely fit into specific holes, enabling the pin to lock into the desired position without needing to be removed from other holes, thus allowing length adjustment in a single operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a blocking pin with spring action is used to lock the tubular profiles, then the blocking mechanism is simple and reliable, but the user must repeatedly dismount from the cabin to unlock and relock the pin for each length adjustment
Solution Approach 1:
The blocking pin is pre-positioned in a retracted position before the extension assembly is extended. This preliminary positioning allows the pin to automatically engage with the next available hole in the series without requiring manual intervention, thereby reducing the need for repeated dismounting and time-consuming manual locking operations.
Solution Approach 2:
The blocking mechanism is designed to automatically lock the tubular profiles at the desired length position without requiring user intervention. The spring-loaded pin self-actuates to engage with the holes in the series, enabling the extension assembly to lock itself at the correct position based on the extension distance, thereby eliminating the need for repeated manual locking operations.
2Adaptability or versatility
If multiple holes are provided in the second tubular profile for different length positions, then the trailer can be adjusted to various lengths, but the blocking pin must be manually repositioned for each hole
Solution Approach 1:
The blocking pin automatically engages with the appropriate hole in the series based on the extension distance, eliminating the need for manual repositioning. The spring action and geometric design enable the pin to self-select and lock into the correct hole corresponding to the desired length position.
Solution Approach 2:
The blocking pin is pre-configured in a retracted position that allows it to automatically engage with the next available hole in the series as the extension assembly is extended, eliminating the need for manual intervention to reposition the pin for each length adjustment.
3Ease of operation
If the blocking pin is connected with the first tubular profile to be adjustable in axial direction, then the pin can move between locking and release positions, but the user must still repeatedly intervene to unlock the mechanism
Solution Approach 1:
The blocking pin automatically transitions between locked and unlocked positions based on the extension assembly's movement. The spring-loaded design enables the pin to self-actuate, engaging with holes during extension and automatically locking without requiring repeated manual unlocking operations by the user.
Solution Approach 2:
The blocking pin is pre-positioned in a retracted state that allows automatic engagement with the hole series during extension, eliminating the need for manual unlocking interventions. The preliminary positioning enables the pin to automatically lock at the correct position as the extension assembly reaches its desired length.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3
AI summary
Trailer with extendible chassis provided with two tubular profiles telescopically slidable relative to each other in a length direction and provided with a blocking mechanism for blocking the two tubular profiles relative to each other. The blocking mechanism comprises a blocking pin which is adjustably connected with the first tubular profile. The second tubular profile is provided with a series of holes. Each hole of the series of holes in the second tubular profile has a unique hole shape orientation and/or has a unique transverse position with respect to a length direction of the second tubular profile. The position and/or rotational orientation of the blocking pin with respect to the first tubular profile is adjustable, such that the blocking pin, for each hole of the series of holes, is bringable into a unique position and/or rotational orientation associated with that hole and so that an end of the blocking pin can only extend into the relevant, associated hole for blocking the telescopic slideability of the two tubular profiles.