Electromotive double drive
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Solution Overview
Problem
Existing electromotive double drives for adjusting support parts of seating and/or lying furniture, such as box-spring beds, have a design that can be improved for simplicity, cost-effectiveness, and increased stability against bending loads.
Innovation Solution
The base body of the double drive is shortened in longitudinal direction, with pivot axes positioned vertically over bearing surfaces, allowing fixation to transverse cross-members spaced from the bed base ends, reducing the distance between fixing points and enhancing stability by transferring reaction forces directly to these cross-members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the base body is made longer to accommodate supporting and fixing structures at the ends, then the double drive can be fixed to transverse cross-members at the ends of the bed base, but the base body becomes more complex and less stable against bending loads
Solution Approach 1:
The supporting and fixing structures are repositioned from the longitudinal ends of the base body to positions vertically above the pivot axes, utilizing the vertical dimension for force transfer. This dimensional repositioning allows the base body to be shorter while maintaining stability, as the fixing structures now engage transverse cross-members that are positioned to provide better bending load resistance.
Solution Approach 2:
Instead of extending the base body longitudinally to reach the ends of the bed base for fixation, the invention inverts the approach by positioning the fixing structures upward above the pivot axes and selecting transverse cross-members that are spaced from the ends. This inverted positioning strategy achieves better stability with a shorter base body.
2Ease of manufacture
If the base body is shortened to simplify construction and reduce costs, then manufacturing becomes more efficient, but the double drive may become less stable against bending loads
Solution Approach 1:
The invention compensates for the shortened base body by utilizing the vertical dimension - positioning the supporting and fixing structures directly above the pivot axes. This vertical positioning allows reaction forces to be transferred more effectively to the transverse cross-members, maintaining stability despite the reduced longitudinal length that simplifies manufacturing.
Solution Approach 2:
The invention changes the positional parameters of the supporting and fixing structures from longitudinal extremities to vertical positions above the pivot axes. This parameter change allows the base body length to be reduced for easier manufacture while the vertical positioning maintains or enhances stability against bending loads through improved force transfer geometry.
3Stability of the object's composition
If the supporting and fixing structures are positioned at the ends of the base body, then the double drive can be assembled with standard bed base configurations, but the distance between fixing points increases reducing stability
Solution Approach 1:
The invention transitions from longitudinal positioning (at the ends of the base body) to vertical positioning (above the pivot axes). This dimensional change reduces the distance between fixing points in the longitudinal direction, improving stability, while the fixing structures remain compatible with standard bed base configurations by engaging transverse cross-members that are spaced from the ends.
Solution Approach 2:
The invention applies local quality by positioning the supporting and fixing structures at specific locations vertically above the pivot axes rather than uniformly at the ends. This localized positioning optimizes the distance between fixing points for stability while maintaining compatibility with standard bed base configurations through the use of appropriately spaced transverse cross-members.
Data Source
AI summary
An electromotive double drive 2 for adjusting pivotally adjustable support parts of a support device for supporting a cushioning of a seating and/or lying furniture, in particular a mattress of a box-spring bed, relative to one another comprises a base body 4, at which two drive units 6, 8 are arranged, each comprising a drive member 10 or 12 respectively. The double drive 2 further comprises two pivot levers 18, 20 spaced apart from one another in longitudinal direction of the base body 4 and each pivotably disposed at the base body around a pivot axis 14 or 16 respectively, wherein the pivot levers 18, 20 are respectively in operative connection with the output member 10, 12 of an associated drive unit 6, 8 for pivoting the respective pivot lever 18, 20 relative to the base body 4. The base body 4 comprises two supporting and fixing structures 30, 32 spaced apart from one another in its longitudinal direction for supporting and fixing the base body 4 at transverse cross-members 38, 40, wherein each supporting and fixing structure 30, 32 comprises a support surface 34 or 36, respectively, for resting at a transverse cross-member 38, 40. According to the invention, the support surfaces 34, 36 are arranged in longitudinal direction of the base body at the height of the pivot axes 14, 16 in such a way that, in the mounting position of the double drive 2, the pivot axes 14, 16 lie in vertical direction via the respective associated support surface 34 or 36.