Cooling cabinet
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Solution Overview
Problem
Existing cooling cabinet access doors with handle devices lose packing density due to the protruding handle, which requires additional space in storage and transport, compromising efficiency.
Innovation Solution
A handle device with a base member connected to the door panel and a grip member that can be assembled without tools, utilizing a dovetail connection and snap means, allowing the handle to be nested between panels without affecting packing density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a protruding handle device is mounted on the flat outer plate of the access door, then the door can be easily manipulated between closed and opened positions, but the packing density of the door panels is lost due to additional intermediate space required between successive panels in a stack
Solution Approach 1:
The base member of the handle device is designed to nestle into the step height cavity formed by the offset central part of the second plate body. This nesting arrangement allows the handle base to occupy the existing void space between the central and peripheral edge parts, rather than protruding outward from the door panel surface. Consequently, the handle device does not increase the overall envelope dimensions of the door panel, maintaining packing density while providing manual operation capability.
Solution Approach 2:
The handle device utilizes the third dimension (depth) by recessing the base member into the step height cavity of the second plate body. Instead of extending the handle outward from the door surface (adding to the envelope in one dimension), the solution moves the handle structure into the existing depth variation created by the offset central part, thereby maintaining the external dimensions while enabling handle functionality.
2Ease of operation
If the base member extends above the surface of the first plate body by more than the step height, then the handle device provides sufficient grip leverage, but the base member cannot nestle between successive panels in a stack
Solution Approach 1:
The base member is designed with differentiated local qualities: its height is specifically controlled to be less than the step height at the location where it must nestle between panels, while the grip member extending from it provides sufficient leverage for operation. This localized height restriction at the base member, combined with the grip extension, simultaneously achieves both stackability and operational effectiveness.
3Reliability
If the handle device requires tool-based assembly, then the connection between base member and grip member is more secure, but the assembly process becomes more complex and time-consuming
Solution Approach 1:
The connection between the base member and grip member is achieved through a snap-fit mechanism that utilizes elastic deformation and geometric interlocking rather than traditional mechanical fastening methods. The grip member features a resilient portion that elastically deforms during assembly and snaps into a locked position with the base member, providing secure connection without requiring screws, clips, or other tool-based fastening systems.
Solution Approach 2:
The snap-fit connection mechanism is designed to be self-assembling through simple manual insertion and twisting motions. The resilient portion of the grip member automatically engages with the base member when the grip member is inserted and rotated, creating a self-locking connection that requires no additional tools or assembly steps beyond basic manual manipulation.
Data Source
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Figure 5
AI summary
A cooling cabinet comprises a conditioned space (10) with an access door (30). The access door comprises a first, substantially flat plate body (31) and a substantially plane-parallel second plate body (32), which second plate body comprises a central part (35) which lies offset over a step (s) relative to a peripheral edge part (34). The access door is provided with a handle device (60) whereby the access door can be manually manipulated between a closed position and an opened position. The handle device comprises a base member (61) which is connected permanently to a free surface of the first plate body (31), and a grip member (62) which can be connected to the base member (61). The base member (61) extends no further than a height (h) above the surface of the first plate part (31), which height (h) is smaller than the step (s) of the central part (35) of the second plate body (32) relative to the edge part (34).