Multi Motion Switch with Multiplier Arm for Power Tool Actuation
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Solution Overview
Problem
Paddle switches on power tools require more force and displacement to actuate at the pivot end compared to the non-pivot end, making it difficult to activate the switch from certain hand positions.
Innovation Solution
A power tool design incorporating a multiplier member with a hinge pin and arms that allows force application at any point along the paddle, enabling easier actuation by altering the distance between the hinge pin and support surface, and transmitting this force to a switch mechanism for activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a paddle switch pivots on one end, then the switch can be actuated from various hand positions, but more force is required to actuate the switch at the pivot end compared to the non-pivot end
Solution Approach 1:
The paddle switch is divided into two functional parts: a paddle member for force application and a multiplier member with arms that transmit and amplify the force. The multiplier member segments the force transmission path, allowing the input force to be applied at any position on the paddle while distributing the mechanical advantage throughout the mechanism.
Solution Approach 2:
The multiplier member acts as an intermediary between the paddle member and the switch mechanism. It includes a first arm that receives force from the paddle and a second arm that contacts the support surface, mediating the force transmission and providing mechanical advantage regardless of where on the paddle the force is applied.
2Device complexity
If a paddle switch pivots on one end, then the switch structure is simplified, but more displacement is required to actuate the switch on the non-pivot side
Solution Approach 1:
The multiplier member introduces a second dimension to the force transmission by using two arms extending from the hinge pin at different angles. The first arm extends along a first longitudinal axis and the second arm extends along a second longitudinal axis, creating a multi-dimensional force transmission path that amplifies displacement at the paddle input.
Solution Approach 2:
The multiplier member is pivotally connected to the hinge pin, allowing it to rotate dynamically as the paddle is actuated. This dynamic rotation enables the mechanism to adapt to different input positions and forces, providing consistent mechanical advantage throughout the range of motion.
3Volume of moving object
If the hinge pin is positioned closer to the support surface, then the paddle profile is reduced, but the mechanical advantage is decreased
Solution Approach 1:
The multiplier member uses two arms extending from the hinge pin at different angles to create a multi-dimensional force transmission path. This allows the hinge pin to be positioned closer to the support surface (reducing profile) while the angled second arm provides the necessary mechanical advantage by contacting the support surface at an optimal angle.
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 effortless switch actuation from any point on the paddle, reducing the force and displacement required, allowing activation at the pivot, non-pivot, or center, and accommodating a lower profile paddle with shorter activation displacement.
Implementation Method 1
The multiplier member is pivotally connected to the hinge pin. The multiplier member has a first arm extending from the hinge pin along a first longitudinal axis and a second arm extending from the hinge pin along a second longitudinal axis that is not parallel to the first longitudinal axis. When a force is applied at the input surface, the second arm contacts the support surface, causing the multiplier member to rotate about the hinge pin.
Implementation Method 2
The paddle member has an input surface upon which an input force is applied. The paddle member also has a hinge pin positioned a distance from the support surface such that application of force on the input surface alters the distance between the hinge pin and the support surface.
Data Source
AI summary
A power tool having a paddle switch is configured to allow easier actuation of a switch mechanism. The power tool comprises a housing, a support surface disposed within the housing, a switch mechanism having a first position and a second position, a paddle member including an input surface and a hinge pin positioned a distance from the support surface, and a multiplier member pivotally connected to the hinge pin and having a first arm and a second arm. The first arm of the multiplier member extends from the hinge pin along a first longitudinal axis, and the second arm of the multiplier member extends from the hinge pin along a second longitudinal axis that is not parallel to the first longitudinal axis. The second arm is disposed to contact the support surface when force is applied to the input surface, causing rotation of the multiplier member about the hinge pin. The rotation of the hinge pin causes the first arm to contact the switch mechanism and move it from the first position to the second position.