Handle and freezer
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Solution Overview
Problem
Existing freezer handles lack user-friendliness, particularly in terms of ease of operation and airtight sealing, especially at extremely low temperatures.
Innovation Solution
A handle design with a knob portion that rotates between a door-locking and door-unlocking position, utilizing an engaging pin and engaging groove mechanism, along with a handle returning locking mechanism and security mechanisms, to improve usability and maintain airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch receiver and latch part engagement mechanism is used to maintain door closure, then the airtight sealing is improved, but the ease of operation deteriorates due to difficulty in opening at extremely low temperatures
Solution Approach 1:
The handle applies preliminary action by pushing the latch part in the opening direction before the door can be opened. This preliminary pushing action reduces the engagement force between the latch receiver and latch part, making it easier to open the door at extremely low temperatures where sealing forces are stronger.
Solution Approach 2:
The handle acts as an intermediary mechanism between the user and the door opening action. It mediates the opening process by first pushing the latch part to reduce engagement, then rotating to facilitate door opening, thereby solving the contradiction between maintaining strong sealing and enabling easy opening.
2Reliability
If a complex latch mechanism is used to prevent unintentional opening, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The latch mechanism uses dynamic characteristics where the latch part can elastically deform under pushing force from the handle, then returns to its original position. This dynamic behavior provides automatic locking functionality without requiring complex mechanical components, maintaining reliability while minimizing complexity.
Solution Approach 2:
The latch mechanism performs self-service by automatically maintaining engagement through the elastic deformation and recovery of the latch part. The mechanism self-regulates the engagement force and automatically prevents unintentional opening without requiring additional control systems or complex components.
Data Source
Figure 1
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AI summary
A handle (100) is provided with: a body base (102) having an engagement pin (110); a door base (104) having a rotary shaft (118); a handgrip (106) capable of being displaced between a door locking position and a door unlocking position; and a rotary stopper (136) that determines the door unlocking position. The handgrip (106) has an engagement groove (130). The engagement groove (130) has an open end (132) which is oriented in a horizontal direction in the case of being in the door unlocking position. In the door locking position, the engagement groove (130) and the engagement pin (110) come into engagement with each other to restrict the opening/closing of a door (4), and in the door unlocking position, the engagement between the engagement groove (130) and the engagement pin (110) is cancelled to allow the opening/closing of the door (4). When the handgrip (106) is in the door locking position, the rotary stopper (136) causes positioning of the handgrip (106) such that the engagement pin (110) is located within an extension range of the open end (132) in the vertical direction. The engagement groove (130) has an extrusion surface (138) that presses the engagement pin (110) when the handgrip (106) is being displaced.