Bicycle Frame Lock Blocking Projection Prevents Manipulative Removal
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Solution Overview
Problem
Frame locks for bicycles can be insecure against manipulative removal, as the securing element can be unlocked by tensile loading without actuating the locking bolt, allowing the bolt to be pulled out of the receptacle.
Innovation Solution
The securing element is accommodated in a recess with play, and a blocking device with a blocking projection is used to prevent displacement from the locking to the release position under tensile load, ensuring the bolt cannot be removed without proper actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the securing element is pretensioned by a spring into the locking position, then the bolt is secured against removal, but manipulative tensile loading can overcome the spring force and displace the securing element to the release position
Solution Approach 1:
The blocking device is pre-configured in the recess to prevent the securing element from being displaced to the release position. The blocking projection on the securing element engages with the stationary stop before any manipulative force can act, thereby preliminarily preventing the harmful displacement that would otherwise require overcoming spring pretension.
Solution Approach 2:
The blocking device acts as an intermediary between the securing element and the recess wall. This intermediary structure (blocking projection and stationary stop) transfers and redirects the forces, preventing the direct transmission of manipulative tensile loads to the securing element that would overcome the spring pretension.
2Reliability
If the securing element is received in the recess without play, then displacement is prevented, but regular release actuation becomes difficult or impossible
Solution Approach 1:
The recess is designed with differentiated local qualities: the main body provides a tight fit for the securing element to prevent unauthorized removal, while the opening region provides controlled play (approx. 0.5-2 mm) that allows the securing element to be pushed into the release position during legitimate unlocking operations.
Solution Approach 2:
The system transitions from a static tight-fit design to a dynamic design where the play in the recess opening allows controlled movement. The blocking device dynamically engages to prevent unauthorized displacement while permitting controlled movement during proper release actuation, adapting the constraint level based on the operation type.
3Reliability
If a blocking device with positive locking is provided, then manipulative displacement is prevented, but the device complexity increases
Solution Approach 1:
The blocking function is segmented into two independent components: the blocking projection on the securing element and the stationary stop in the recess. This segmentation allows each component to be simple in design while collectively providing robust blocking functionality, avoiding the need for a complex integrated blocking mechanism.
Solution Approach 2:
The blocking device is designed to be self-activating through the natural insertion and movement of the securing element. The blocking projection automatically engages with the stationary stop when the securing element is in the locking position, providing passive security without requiring additional actuators, sensors, or control systems.
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 effectively secures the bolt against manipulative removal by using a blocking projection that engages a stationary stop, preventing displacement from the locking to the release position under tensile load, thus enhancing the security of the frame lock without affecting user comfort during regular unlocking.
Implementation Method 1
a securing element (33), which is accommodated in a recess (43) opening into the bolt receptacle (25) and is pretensioned in the direction of the locking position by a spring (35)
Data Source
Figure 1
Figure 2
Figure 3a~4
AI summary
The invention relates to a frame lock for a two-wheeler, comprising a locking bolt which is adjustable between a closed position and an open position, a clamp receptacle for a clamp of a safety cable, and a locking element which is slidably mounted transversely to the insertion direction of the clamp between a locking position and a release position, which is received in a recess opening into the clamp receptacle and is biased in the direction of the locking position, wherein in the locking position the locking element projects into the clamp receptacle and in the release position is at least partially retracted from the clamp receptacle in order to selectively secure the clamp received in the clamp receptacle against removal or to release it for removal.The locking element is received in the recess with play in the insertion direction, and a locking device acting by positive locking is provided to block the movement of the locking element from the locking position to the release position in a position of the locking element in the recess opposite to the insertion direction, which would release the clamp.