Multi-mode Drill Mode Collar Cam Switch Actuation
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Solution Overview
Problem
Multi-mode drills lack an efficient mechanism for seamlessly transitioning between different operational modes, such as drilling and hammer-drilling, due to the manual actuation of mode collars and electronic switches, which can lead to inconsistent performance and user error.
Innovation Solution
A multi-mode drill design featuring a rotatable mode collar with a cam surface and a cam follower system that biases an electronic switch, allowing automatic actuation between modes based on the collar's position, ensuring smooth transitions without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual actuation of mode collar and electronic switch is used, then device complexity is reduced, but reliability deteriorates due to inconsistent performance and user error
Solution Approach 1:
The mode collar is designed to automatically actuate the electronic switch through its own rotational movement. The cam surface on the mode collar directly engages with the cam follower, which is connected to the electronic switch, eliminating the need for separate manual actuation components and reducing overall device complexity while improving reliability.
Solution Approach 2:
A cam follower acts as an intermediary mechanism between the mode collar and the electronic switch. The cam follower translates the rotational movement of the mode collar into linear movement that actuates the electronic switch, providing a reliable and consistent switching mechanism.
2Productivity
If manual actuation is used, then ease of operation is improved, but productivity deteriorates due to time loss from manual intervention
Solution Approach 1:
The cam surface on the mode collar is pre-configured to automatically actuate the electronic switch at the precise moment the mode collar reaches the desired position. This preliminary arrangement eliminates the need for separate manual switching actions, reducing time loss and improving productivity while maintaining ease of operation.
3Reliability
If automatic cam follower actuation is used, then reliability is improved, but device complexity increases due to additional components
Solution Approach 1:
The cam mechanism is integrated into the mode collar assembly, combining the mode selection function with the switch actuation function. The cam surface is directly formed on the mode collar, and the cam follower is positioned to engage with this surface, merging multiple functions into a single compact mechanism that improves reliability without significantly increasing 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
The design enables seamless mode switching, improving user experience by eliminating manual errors and providing consistent performance across different operational modes, enhancing the drill's versatility and efficiency.
Implementation Method 1
An actuation spring member is operably mounted between the cam follower and the movable member of the electronic switch. When the cam follower is in the first cam follower position, the actuation spring member provides a biasing force that is sufficient to overcome a biasing force of the switch spring member to thereby actuate the movable member of the switch
Implementation Method 2
when the cam follower is in the second cam follower position, the actuation spring member provides a biasing force that is insufficient to overcome a biasing force of the switch spring member to thereby permit the switch spring member to move the movable member into an unactuated position
Data Source
AI summary
A drill includes a housing with a motor coupled to an output spindle via a transmission. A mode collar can be rotatably mounted on the housing for movement that corresponds to different modes of operation. The mode collar can be coupled to an electronic switch to operate a movable member thereof. The coupling can include a switch housing including a slide member, an actuation spring member and a return spring member. The mode collar can have a cam surface and a cam follower in the form of a shift pin that moves the slide member, causing actuation of the switch. The actuation spring member provides a biasing force that is sufficient to overcome a biasing force of a switch spring member to move the movable member into the actuated position. The mode collar can also enable and disable contact between a fixed hammer member and a movable hammer member mounted around the output spindle.