Manual Locking Device for Railway Vehicle Doors
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Solution Overview
Problem
Conventional manual locking devices for railway vehicle doors require a large restraining force to lock the door leaves, and they do not allow one door leaf of a double sliding door to remain unlocked while the other is locked, necessitating a stronger and larger device.
Innovation Solution
A manual locking device with a transmission mechanism, a restraining portion, and an operation portion that locks the door leaf by contacting a moving portion within the transmission mechanism, allowing locking with a smaller force and enabling one door leaf to remain unlocked while the other is locked, using a cam mechanism and links to facilitate locking only at the fully closed position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the door leaf is locked directly by contacting the door leaf itself, then the door can be restrained, but a large restraining force is required and the device size increases
Solution Approach 1:
The patent introduces a moving portion as an intermediary element between the restraining portion and the door leaf. The restraining portion contacts the moving portion (which is part of the transmission mechanism) rather than directly contacting the door leaf. This intermediary allows the restraining force to be applied at a point where mechanical advantage can be obtained, reducing the force required from the locking device while maintaining effective door restraint.
Solution Approach 2:
The patent segments the door locking system into distinct functional components: the door leaf, the transmission mechanism with moving portion, and the restraining portion. By separating the locking function from direct door contact, the system can apply restraint forces more efficiently through the transmission mechanism, reducing the strength requirements of the locking device itself.
2Reliability
If both door leaves are locked simultaneously, then security is improved, but the device complexity increases and one door leaf cannot remain unlocked
Solution Approach 1:
The patent applies segmentation by providing separate restraining portions for each door leaf, each independently controllable. This allows selective locking of individual door leaves without requiring a complex integrated locking system, maintaining security while reducing overall device complexity.
Solution Approach 2:
The patent enables dynamic control of the locking state for each door leaf independently. The restraining portions can be activated or deactivated separately, allowing flexible security configurations where one door leaf can be locked while another remains unlocked, adapting to different operational requirements without increasing mechanism 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
Enables door leaf locking with a smaller restraining force and allows one door leaf of a double sliding door to remain unlocked, improving security and reducing the size and strength requirements of the locking device.
Implementation Method 1
The lock restraining portion (91) is formed of a cam including the pressed portion (91d) and the engaging portion (91h)
Implementation Method 2
a transmission mechanism for transmitting a driving force from a drive source to a door leaf to cause the door leaf to move between a fully open position and a fully closed position
Data Source
Figure 1
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AI summary
A manual locking device (101) according to one aspect of the present invention includes: a transmission mechanism (4) for transmitting a driving force from a drive source (3) to a door leaf 10 to cause the door leaf (10) to move between a fully open position and a fully closed position; at least one moving portion (5) provided on the transmission mechanism (4) and configured to move in synchronization with opening and closing of the door leaf (10); a restraining portion (6) configured to restrain movement of the at least one moving portion (5) in an opening-closing direction of the door leaf (10); an operation portion (7) configured to be manually operated to produce an operating force; and a locking portion (8) configured to accomplish locking when the door leaf (10) is at the fully closed position, by moving the restraining portion (6) by the operating force of the operation portion (7) from an unlocking position in which the movement of the at least one moving portion (5) is not restrained to a locking position in which the movement of the at least one moving portion (5) is restrained.