Crossbow Arrow Press Device with Adjustable Resilient Contact
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Solution Overview
Problem
Existing arrow press devices for crossbows often apply varying pressing forces to arrows due to differences in arrow height, affecting shooting speed and precision, and can cause the arrow to be shot with its head pointed upward, leading to reduced accuracy.
Innovation Solution
The arrow press device features a press piece with a resilient member and adjustment screws that allow for precise movement along a rack or sleeve, ensuring a constant pressing force is applied to the arrow by adjusting the position of the press piece relative to the arrow, and includes a rolling bead to reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressing member is fixed at a constant position, then the device structure is simple, but the pressing force varies when arrow height differs, affecting shooting precision
Solution Approach 1:
The pressing member is made adjustable along the groove rather than being fixed, allowing dynamic repositioning to match different arrow heights. This resolves the contradiction by enabling precision adjustment without significantly complicating the overall device structure.
Solution Approach 2:
The position parameter of the pressing member is made variable through adjustment mechanisms (screws, slots, or threaded holes), allowing the pressing force application point to be changed according to different arrow specifications, thereby maintaining shooting precision across various arrow types.
2Reliability
If the pressing member applies strong pressing force to the arrow, then the arrow is prevented from dropping, but the shooting speed is affected
Solution Approach 1:
The pressing member is designed with a localized contact surface that applies force only to the specific region of the arrow shaft where needed (near the groove), rather than along the entire arrow length. This concentrated local pressure secures the arrow effectively while minimizing interference with the arrow's motion during release.
Solution Approach 2:
The pressing member applies sufficient pressing force only when needed (when the arrow is loaded and needs to be secured), and releases or reduces this force during the shooting phase. The adjustment mechanisms allow optimizing the pressing force to be just enough for retention without excessive force that would impede shooting speed.
3Reliability
If the pressing member applies force to the rear end of the arrow, then the arrow is secured, but the arrow head points upward, reducing shooting precision
Solution Approach 1:
The pressing member is positioned and shaped to apply force locally to the front portion or middle section of the arrow shaft rather than the rear end, ensuring the arrow head remains properly aligned and pointing forward. This localized force application secures the arrow without causing upward tilting.
Solution Approach 2:
The pressing member is designed with a specific geometry (such as a curved surface or angled contact face) that applies force in a direction that not only secures the arrow vertically but also maintains proper horizontal alignment, preventing the arrow head from pointing upward by distributing force across multiple spatial dimensions.
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 solution ensures a consistent pressing force is applied to the arrow, maintaining shooting precision and accuracy by adjusting the position of the press piece to match varying arrow heights, while minimizing friction through a rolling contact.
Implementation Method 1
A resilient member is located in the passage and biased between the press piece and the underside of the cap so that the press piece partially protrudes beyond the bottom opening
Data Source
AI summary
A crossbow includes a barrel with a groove in the top thereof. An aiming member is connected to the barrel. A rack is connected to the aiming member and located corresponding to the groove. A press piece includes a passage, a resilient member located in the passage and a press piece. The press piece is biased by the resilient member and partially protrudes beyond the press piece. Multiple restriction screws extend through the press piece and are threadedly connected to the rack. A spring is mounted to the threaded section of each restriction screw. The press piece is biased by the springs to resiliently contact the underside of the rack. An adjustment screw threadedly extends through the rack and contacts the press piece. The press piece is moved by rotating the adjustment screw to provide a constant force to the arrow in the groove.