Crossbow Arrow Pressing Device Modular Sleeve Design
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Solution Overview
Problem
Conventional crossbow arrow shaft pressing devices suffer from elastic fatigue and inconvenient replacement due to narrow spaces, requiring detachment of the aiming device for pressing plate replacement.
Innovation Solution
An arrow shaft pressing device with a sleeve connected to the aiming device, featuring a resilient pressing member and a restriction member, allowing for individual replacement without detaching the aiming device, utilizing a sleeve with axial passage and aperture, and a resilient member for pressing the arrow shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressing plate is fixed to the aiming device by a bolt from the underside, then the pressing plate can be securely attached, but the narrow space prevents easy operation of screwdrivers and requires detachment of the aiming device for replacement
Solution Approach 1:
The pressing device is divided into separate modular components: the pressing member (3) can be independently removed from the sleeve (2) by pulling it through the aperture (22), while the sleeve remains attached to the aiming device (15). This segmentation allows the pressing member to be replaced without detaching the entire aiming device, resolving the contradiction between secure attachment and replacement convenience.
2Reliability
If the pressing plate is securely fixed to the aiming device, then stable pressing function is achieved, but the structure becomes complex and difficult to maintain
Solution Approach 1:
The pressing member (3) is extracted as a separate replaceable component from the sleeve (2), which remains integrated with the aiming device (15). The pressing member can be individually removed through the aperture (22) without affecting the sleeve or aiming device structure. This extraction simplifies the overall structure by separating the consumable pressing element from the permanent mounting structure, reducing complexity while maintaining stable pressing function.
3Ease of repair
If the pressing member is resilient and can be individually replaced, then maintenance is simplified, but additional components (sleeve, restriction member) are required
Solution Approach 1:
The pressing member (3) is nested within the sleeve (2), which is itself nested within or attached to the aiming device (15). The restriction member (5) is nested within the sleeve to limit the pressing member's movement. This nesting arrangement allows the smallest component (pressing member) to be accessed and replaced by simply pulling it through the aperture (22), simplifying maintenance despite the presence of multiple nested components.
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
Enables easy replacement of the pressing member without disassembling the aiming device, extending the device's lifespan by avoiding elastic fatigue and simplifying maintenance.
Implementation Method 1
A resilient member 4 is located in the passage 21 and biased between the flange 31 of the pressing member 3 and the restriction member 5. The distal end of the shank 32 of the pressing member 3 resiliently presses the arrow shaft
Data Source
AI summary
An arrow shaft pressing device for a crossbow includes a sleeve connected to one end of the aiming device and has a passage with an aperture defined through the lower end of the sleeve. A shoulder is formed at the connection portion between the passage and the aperture. A pressing member has a flange and a shank extending from the underside of the flange. The pressing member is located in the passage of the sleeve and the distal end of the shank extends beyond the aperture. A restriction member is connected to the top end of the sleeve. A resilient member is biased between the flange of the pressing member and the restriction member. The distal end of the shank of the pressing member resiliently presses the arrow shaft.