Movable Cam Part Reduces Friction in Door Lock Transmission
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Solution Overview
Problem
Existing door opening mechanisms suffer from wear and friction issues, leading to increased force requirements and potential failure in opening locked doors, especially in emergency situations.
Innovation Solution
An arrangement that includes a movable cam part connected to a lever and idler sheave, reducing friction by allowing thrusting motion instead of lifting, thereby decreasing the force needed to open a door and extending the lifespan of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional door opening mechanisms are used, then the door can be opened, but wear and friction between parts increases, leading to excessive force requirements and potential failure
Solution Approach 1:
The cam part is designed to be movable relative to the lever, allowing it to shift position during operation. This dynamic configuration enables the cam part to rotate the idler sheave through thrusting motion rather than lifting, continuously adapting the force transmission path to minimize friction and wear between contacting surfaces.
2Ease of operation
If conventional lifting motion is used to operate the locking bolt, then the locking bolt can be moved, but excessive force is required and friction increases
Solution Approach 1:
Instead of lifting the idler sheave vertically to move the locking bolt, the invention inverts the motion approach by using horizontal thrusting motion of the cam part against the sheave. This rotational thrusting action converts the lifting force requirement into a more efficient rotational force, significantly reducing the effort needed to open the door.
3Duration of action of stationary object
If fixed cam part configuration is used, then the structure is simple, but wear between parts increases and durability decreases
Solution Approach 1:
The cam part is designed to be movable relative to the lever, allowing it to shift position during operation. This dynamic configuration enables the cam part to rotate the idler sheave through thrusting motion rather than lifting, continuously adapting the force transmission path to minimize friction and wear between contacting surfaces.
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
The solution facilitates easy and reliable door opening with reduced force, enhancing safety and durability by minimizing wear and friction between parts, ensuring doors can be opened even under heavy loads or in emergencies.
Implementation Method 1
a cam part (127) connected to the lever, wherein the cam part is arranged to rotate the idler sheave when the lever is pushed
Implementation Method 2
the cam part is arranged to be movable with respect to the lever... enables the cam part to rotate the idler sheave by thrusting it instead of lifting it significantly at the same time. This decreases friction between the parts
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The present invention provides an arrangement (101) for transmission of movement which arrangement (101) comprises a body (102), a shaft (118) arranged to the body (102), a locking bar (109) for moving a locking bolt of a lock, an idler sheave (114) attached to the locking bar (109), a lever (120) arranged turnably on the shaft (118), and a cam part (127) connected to the lever (120), said cam part (127) being arranged to rotate the idler sheave (114) when the lever (120) is pushed. In the arrangement (101) for transmission of movement according to the invention the cam part (127) is arranged to be movable with respect to the lever (120). The present invention relates also to a door comprising said arrangement (101).