Adjustable Stop Assembly With Cam Lock and Microadjustment
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Solution Overview
Problem
Existing devices for defining cut dimensions in workpieces, such as jigs and stop blocks, are often inconvenient to set up and lack fine adjustment capabilities, leading to inefficiencies in repetitive cutting tasks.
Innovation Solution
An adjustable stop assembly comprising a body, cam, lock knob, adjustable rod, and adjusting knob, which allows for precise positioning and locking of a fence assembly along a rail, enabling fine adjustments and enhanced safety by preventing kickback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional jigs and stop blocks are used to define cut dimensions, then repetitive cuts can be made at defined dimensions, but the devices are inconvenient to set up and incapable of fine adjustments
Solution Approach 1:
The stop assembly transitions from a fixed position to a dynamically adjustable position through the cam mechanism. The cam can be rotated to move the stop block along the rail, allowing continuous adjustment rather than fixed positions, thereby enabling fine adjustments while maintaining ease of operation through simple rotational motion
Solution Approach 2:
The position parameter of the stop block is changed by rotating the cam, which converts rotational motion into linear displacement along the rail. This allows the stop position to be adjusted to any desired location within the rail's range, providing fine adjustment capability while keeping the setup process simple and convenient
2Ease of operation
If the cam is exposed fully for adjustment, then the adjusting knob is easily accessible, but the device structure becomes more complex and less compact
Solution Approach 1:
The adjusting knob is segmented into two functional portions: a major sector portion that remains covered by the body for structural compactness, and a minor sector portion that is exposed through an opening for accessibility during adjustment. This segmentation allows the device to maintain a compact structure while still providing easy access to the adjustment function when needed
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 adjustable stop assembly facilitates precise and repeatable cuts by allowing microadjustments, improving safety through secure locking and preventing misalignment, thus enhancing the accuracy and reliability of cutting operations.
Implementation Method 1
The cam is rotatable about an axle disposed within the body. The cam includes a hook portion. The cam is movable into a locked position in which the hook portion is secured to a rail portion of a rail of the power tool and an unlocked position in which the hook portion is spaced from the rail.
Implementation Method 2
The lock knob is configured to interact with the cam to provide a locked state in which the cam is in the locked position and an unlocked state in which the cam is in the unlocked position.
Implementation Method 3
An adjusting knob is configured to move the adjustable rod to adjust the first extension amount and the second extension amount.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
An adjustable stop assembly (100, 200) includes a body (108, 208), a cam (144), a lock knob (102), an adjustable rod (106), and an adjusting knob (104). The cam (144) includes a hook portion (150). The cam (144) is movable into a locked position in which the hook portion (150) is secured to a rail (15, 18) portion (110, 112) of the rail (15, 18) and an unlocked position in which the hook portion (150) is spaced from the rail (15, 18). The lock knob (102) is configured to interact with the cam (144) to provide a locked state in which the cam (144) is in the locked position and an unlocked state in which the cam (144) is in the unlocked position. The adjustable rod (106) extends outward from a first side of the body (108, 208) by a first extension amount (178, 180) and a second side of the body (108, 208) by a second extension amount (178, 180). The adjusting knob (104) is configured to move the adjustable rod (106) to adjust the first extension amount (178, 180) and the second extension amount (178, 180). The adjusting knob (104) is disposed within the body (108, 208) such that a minor sector portion (110, 112) of the adjusting knob (104) is exposed by an opening (126) in the body (108, 208) and a major sector portion (110, 112) of the adjusting knob (104) is covered by the body (108, 208) at a given instance.