Door Lock Lever Stopper Mechanism
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Solution Overview
Problem
In existing door lock devices, the positioning of the closing lever and interlinking lever can become unsmooth when the hook transitions from the striker releasing position to the striker holding position due to strong biasing forces and geometric mismatches, leading to potential jamming issues.
Innovation Solution
A door lock device design that includes a stopper mechanism to prevent the closing lever from rotating excessively, ensuring the control projection remains spaced from the control groove end surface, and a control lever with operational and non-operational sections to guide the interlinking lever smoothly during transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the closing lever is biased to rotate in one direction by a spring (biaser) to position the control projection at one end of the control groove, then the positioning of the closing lever and interlinking lever is achieved, but the control projection digs into the end surface of the control groove with strong force, causing unsmooth rotations of the interlinking lever and opening lever
Solution Approach 1:
The patent introduces a cushioning member (elastic element) between the control projection and the end surface of the control groove. This cushioning member absorbs the excessive biasing force before it reaches the control groove end surface, preventing the control projection from digging into the groove while still achieving accurate positioning. The elastic element deforms under the biasing force, providing a soft stop that maintains positioning precision without causing mechanical damage or unsmooth rotation.
2Manufacturing precision
If the control projection moves into the non-operational section of the control groove due to spring biasing, then positioning is achieved, but the rotations of the interlinking lever and opening lever become unsmooth when the hook rotates toward the striker holding position
Solution Approach 1:
The patent divides the control groove into distinct functional sections: an operational section with a specific curvature radius that guides smooth rotation, and a non-operational section for positioning. The cushioning member is specifically positioned to engage only when the control projection reaches the end of the control groove, ensuring that during normal operation the control projection remains in the operational section where the curved surface guides smooth rotational movement.
3Manufacturing precision
If both ends of the control groove are closed to achieve positioning, then the control projection is secured at one end, but the corner portions dig into each other with strong force when the hook is in the striker releasing position
Solution Approach 1:
The elastic cushioning member is installed to engage between the control projection's corner portion and the control groove's end surface before excessive force can develop. When the closing lever rotates and the control projection approaches the end of the control groove, the cushioning member deforms elastically, absorbing the impact and preventing the corner portions from digging into each other with damaging force.
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
This design ensures smooth rotations of the interlinking and opening levers, preventing jamming and allowing the door lock device to move seamlessly into a locked state, maintaining operational efficiency.
Implementation Method 1
a closing lever which is supported by the base plate thereon to be rotatable coaxially with the hook and rotates between a draw-in position, at which the closing lever is positioned toward the striker holding position of the hook, and a draw-in releasing position, at which the closing lever is positioned toward the striker releasing position of the hook; a closing lever biaser which biases the closing lever toward the draw-in releasing position
Data Source
AI summary
A door lock device is disclosed, wherein if positioning of an interlinking lever and a closing ver is performed using the biasing force of a biaser when the hook is in the striker releasing position, subsequent rotations of the interlinking lever and the control lever are prevented from becoming unsmooth.The door lock device is provided with a control slot which moves the interlinking lever toward the coupling position, which moves the interlinking lever toward the coupling disengaging position via the control projection when the control lever rotates toward the coupling disengagement assisting position and which is formed in said control lever, and a stopper which prevents the closing lever from rotating to the draw-in releasing position by the biasing force of the closing lever biaser to thereby make the control projection spaced from an end surface of the control slot.