Circular Saw Tilt Locking Lever Mechanism
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Solution Overview
Problem
The manual handling of snap-in tilt adjustments in existing crosscut saws is not optimal, requiring the use of both hands and involving a risk of injury due to the need to reach behind the saw unit to release the snap-in fixation.
Innovation Solution
A locking actuation lever is articulated at the end of the locking bolt, allowing for two distinct operations: lifting the detent bolt out of the counter-detent with a spring force and achieving a blocking position with consistent actuation, either pulling or pushing, which simplifies and speeds up the handling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual handling of snap-in tilt adjustment is used, then the saw unit can be locked in defined positions, but the operation requires both hands and involves risk of injury due to reaching behind the saw unit
Solution Approach 1:
The patent inverts the conventional approach by having the locking element actuate the detent bolt rather than requiring manual manipulation of the detent bolt itself. The locking element, when actuated, automatically lifts the detent bolt from the counter-detent through a lever mechanism, allowing the operator to release the tilt adjustment from the front without reaching behind the saw unit.
Solution Approach 2:
The patent introduces a locking element as an intermediary mechanism between the operator and the detent bolt. This locking element serves as a mediator that translates simple front-facing actuation into the complex motion required to disengage the detent bolt from the counter-detent, eliminating the need for direct manual handling of the detent bolt itself.
2Reliability
If the locking element is positioned at the back of the workpiece support surface, then the snap-in fixation can be achieved, but the operator must reach behind the saw unit to release it
Solution Approach 1:
The patent changes the spatial dimension of operation by moving the actuation point of the locking element to the front of the workpiece support surface. Instead of requiring rearward motion to release the fixation, the operator now acts on the locking element from the front, completely changing the direction and safety profile of the operation.
Solution Approach 2:
The locking element acts as an intermediary that allows the operator to control the detent bolt engagement from a safe, accessible position at the front of the machine, eliminating the need to reach into the dangerous zone behind the saw unit while maintaining the snap-in fixation function.
3Ease of operation
If a spring-loaded detent bolt is used, then automatic return to locked position is achieved, but manual force is required to lift the bolt out of the counter-detent
Solution Approach 1:
The patent creates a dynamic system where the locking element can pivot to convert small manual forces applied at its actuation point into larger forces that lift the detent bolt against the spring load. The lever action of the locking element provides mechanical advantage, allowing easy actuation despite the spring force resisting bolt movement.
Solution Approach 2:
The locking element serves as a mechanical intermediary that amplifies the operator's input force to overcome the spring force holding the detent bolt in the locked position. This intermediary mechanism makes the system responsive to light manual actuation while maintaining strong spring-loaded engagement.
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 design reduces the manual force required and allows for clear separation of operating states, making the handling of the latching element much quicker and easier, with reduced risk of injury and improved accessibility.
Implementation Method 1
a return spring (28) which presses the detent bolt (29) in the detent direction
Data Source
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AI summary
The invention relates to a circular saw comprising a support (1), a holding device (4) and a sawing unit (5). An adjustable inclination element (15) is provided in the holding device (4), said adjustable inclination element allowing the sawing unit (5) to be pivoted in relation to the support (1) about a horizontal inclination pivoting axis (16) that extends in the direction of sawing and can be fixed in a locked manner in at least one defined inclination position. Said inclination position element (15) comprises a stationary part (24) and an inclination-pivotable part (25). A lock element (26) is arranged on one of the parts (24, 25) and on the other part (24, 25), a counter lock (27) that corresponds to the lock element (26) is provided on each point corresponding to the defined inclination position. Said lock element (26) is spring-loaded in the direction of locking, can be manually released from the counter lock (27) counter to the spring-loading and can be blocked in the released position in such a manner that it can be manually released from the blocked position. Said invention is characterised in that the lock element (26) comprises a stop bolt (29) that is spring-loaded in the direction of locking by a restoring spring (28) and that comes into contact with the counter lock (27), also comprising a lock actuation lever (30) that is pivotably connected to the end of a stop bolt (29), and the lock actuation lever (30) comprises a hand actuated end (31). Starting from the lock position in which the stop bolt (29) is connected to the counter lock (27), the stop bolt (29) can only be released from the counter lock (27) counter to the spring force by a first actuation on the hand actuation end (31) of the lock actuation lever (30) and moves back into the lock direction when releasing the hand actuated end (31). Due to an actuation on the hand actuation end (31) of the lock actuation lever (30), that is essentially counter to the first actuation, the lock bolt (29) can be released from the counter lock (27) counter to the spring force and can be blocked in the released position in one go, essentially not altering the direction of actuation.