Rotary Microtome Crank Blocking Mechanism
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Solution Overview
Problem
Existing rotary microtomes pose a risk of injury and are structurally complex due to the eccentrically arranged crank, which interferes with manual operation and electrical operation, and existing solutions are inadequate and costly.
Innovation Solution
A simple blocking device using a sliding element that fixes the handwheel and crank in place when not in use, allowing for manual operation while preventing rotary movement during electrical operation, and an automatic release mechanism to decouple the actuating element when switching to electric mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an eccentrically arranged crank is provided on the handwheel for manual operation, then the micrometer mechanism can be driven manually, but the crank poses a risk of injury and interferes with operation when the microtome is not in use
Solution Approach 1:
The harmful rotating crank is extracted from the operational state by using a blocking device with a sliding element that can displace to block the crank's rotary movement. The blocking device separates the manual operation function from the stationary state, allowing the crank to be removed from the system when not needed.
Solution Approach 2:
The blocking device employs a sliding element that can dynamically change position between blocking and non-blocking states. This dynamic mechanism allows the system to adapt between manual operation mode (crank free to rotate) and stationary/electric mode (crank blocked), resolving the contradiction between operational ease and safety.
2Object-affected harmful factors
If blocking devices are provided to prevent crank rotation, then safety is improved, but the structure becomes complex and expensive
Solution Approach 1:
The blocking device is merged with the existing handwheel and crank structure. The sliding element integrates with the housing and engages with the crank in a way that combines the blocking function with the existing manual operation mechanism, avoiding the need for separate complex locking systems.
Solution Approach 2:
The blocking device uses simple, inexpensive components such as a sliding element and blocking element that can be easily manufactured and replaced. The design avoids expensive complex mechanisms by using basic mechanical elements that perform the blocking function effectively without requiring precision engineering or expensive materials.
Data Source
Figure 1
Figure 2a~2c
Figure 3a~3b
AI summary
The rotary microtome has a micrometer mechanism that is associated with object holding unit (2). A drive is located for the micrometer mechanism for the vertical movement of the object holding device. A frame is located to receive the micron mill and drive. The object holding unit is located outside the casing (1). A rotary actuator (4) is provided to manual drive. A blocking unit (8) is located to block rotational movement of the rotary actuator over a sliding element.