Torque-Resistant Handlebar Stem With Central Accessory Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing connection systems for vehicle handlebars do not allow for a precisely centric arrangement of accessories like bicycle speedometers and lamps, as the clamping device at the front end encloses the central, cylindrical section of the handlebar, making it difficult to mount accessories without obstructing the handlebar's circumference.
Innovation Solution
Designing a device with two clamping brackets connected by a bridge, allowing mounting clamps to pass through the cylindrical section between the half-shells, creating a free space that enables central mounting of accessories without interfering with the clamping mechanism, which transmits forces and moments effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clamping device encloses the central cylindrical section of the handlebar, then the connection is torque-proof and stable, but the central section of the handlebar becomes inaccessible for mounting accessories
Solution Approach 1:
The clamping device is divided into two separate clamping brackets that can be positioned at different radial distances from the handlebar center. This segmentation allows the inner clamping bracket to maintain secure grip on the handlebar while the outer clamping bracket can be positioned to allow accessory mounting in the intermediate zone.
Solution Approach 2:
The invention utilizes the radial dimension of the handlebar cross-section by positioning clamping brackets at different radii. This creates a free space in the intermediate radial zone where accessories can be mounted without interfering with the clamping mechanism, effectively adding a spatial dimension for accessory installation.
2Strength
If the clamping device is positioned at the front end of the stem, then the connection is secure, but it obstructs the central section of the handlebar from which accessories need to be mounted
Solution Approach 1:
The clamping function is segmented into two spatially separated brackets. The first clamping bracket maintains strong engagement with the handlebar at the stem front end, while the second clamping bracket is positioned radially outward to create mounting space, thus separating the clamping function from the obstruction.
Solution Approach 2:
The intermediate free space created between the two clamping brackets acts as an intermediary zone that allows accessory mounting. This space serves as a mediator between the secure clamping function and the need for accessory installation, enabling both requirements to coexist.
3Stability of the object's composition
If the receiving shell and clamping piece are designed to enclose the handlebar, then the connection is stable, but it prevents precise central positioning of accessories
Solution Approach 1:
The enclosing structure is segmented into two brackets positioned at different radial distances. This segmentation creates an intermediate zone that is neither fully enclosed nor completely exposed, allowing for precise central positioning of accessories while maintaining connection stability through the outer bracket's engagement.
Solution Approach 2:
Different radial zones of the handlebar are given different functional qualities: the inner zone is engaged by the first clamping bracket for stability, while the outer zone provides a free space with precise central positioning capability for accessories. This local differentiation allows both stability and precision to coexist.
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
The invention relates to a device for a torque-resistant connection of a vehicle handlebar (11) with a fork stem (12) of a two- or three-wheeled, in particular muscle-operated vehicle, especially a bicycle, wherein the device is provided with a handlebar stem (13) having at least one clamping device (16), which has a receiving shell (19) formed on a stem base body (18) and a clamping piece which can be adjusted against the receiving shell and also has an approximately semicircular cross-section.In order to make it possible to mount at least one mounting clamp (23) for a vehicle accessory element in as central a position as possible directly on the vehicle handlebars with such a device, the invention proposes that the clamping piece has or is formed by two clamping brackets (20) that are opposed to each other in the axial direction of the cylindrical section, and that the receiving shell is formed by two half-shells (19A, 19B) that are opposed to each other according to the distance between the clamping brackets, between which a free space (22) is formed that does not contact the cylindrical section (17) in the clamping state, in which the mounting clamp for the vehicle accessory element, which at least partially encloses the cylindrical section, can be placed.