Auto Arrow Rest Rotating Cam Mechanism
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Solution Overview
Problem
Arrow rests interfere with the flight of arrows due to contact with the fletching, necessitating an improved design that supports arrows in a launching position without interference.
Innovation Solution
An arrow rest with a rotating cam mechanism and spring-based locking system that moves the arrow launcher from a loading position to a launching position upon drawing the bow, and returns to the loading position immediately after firing, avoiding contact with the arrow's fletching during flight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arrow rest is designed to support the arrow in a launching position, then the arrow support function is improved, but the arrow flight is interfered with due to contact with the fletching
Solution Approach 1:
The arrow rest employs a dynamic mechanism where the rest arm can rotate between a first position (when the bow is drawn) and a second position (when the bow is unstrung). This dynamic adjustment allows the rest to be positioned optimally during the launching phase to support the arrow without interfering with the fletching, and then returns to a neutral position when not in use, eliminating interference with arrow flight.
2Productivity
If the arrow launcher is moved to the loading position after firing, then the arrow rest prepares for the next shot, but the mechanism complexity increases
Solution Approach 1:
The arrow rest utilizes the bowstring's motion to automatically drive the rest arm between its first and second positions. When the bow is drawn, the bowstring pulls the rest arm to the first position; when the bow is unstrung, the rest arm automatically returns to the second position. This self-service mechanism eliminates the need for additional motors, actuators, or complex control systems, achieving automated positioning while minimizing mechanism complexity.
3Stability of the object's composition
If the locking mechanism maintains the launcher in the launching position, then the arrow support stability is improved, but the release mechanism complexity increases
Solution Approach 1:
The locking mechanism is designed to automatically lock the rest arm in the first position during the launching phase and automatically unlock and return to the second position when the bow is unstrung. This self-service locking and unlocking mechanism maintains stable arrow support when needed while eliminating the need for separate release mechanisms, buttons, or electronic controls, thereby reducing overall device complexity.
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
Ensures the arrow launcher supports the arrow effectively in the launching position without interfering with its flight, maintaining the launcher in the correct position until the arrow is fired, thereby enhancing the accuracy and reliability of arrow launches.
Implementation Method 1
a first spring having a first end and a second end, wherein the spring second end is operatively coupled to the cam; and a second spring having a first end operatively coupled to the cam and a second end configured to be coupled to the bow. In particular embodiments, the first spring biases the cam into: (1) a first position where the launcher is in a first, loading position; and (2) a second position where the launcher supports the arrow
Implementation Method 2
the second spring is configured to move the cam from the second position to the first position when the arrow is fired from the bow
Data Source
AI summary
An arrow rest for supporting an arrow on an archery bow. In various embodiments, the arrow rest includes an over-center spring that is operatively coupled to a body of the arrow rest and a rotatable cam received in the arrow rest body. The rotatable cam is rotationally fixed to an arrow launcher. The over-center spring biases the arrow launcher into a first loading position when the spring is in a first position on one side of a central axis about which the cam rotates, and into a second launching position when the spring moves to an opposite side of the cam central axis. A release mechanism is configured to move the arrow launcher from the second, launching position to the first, loading position when an arrow is fired from the bow, but will not move the arrow launcher to the first, loading position if the bow is let down.