Case Ector Planar Bearing Surface Pivot
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Solution Overview
Problem
Existing case erectors face challenges in accurately locating the fold between two adjacent sides of a box to be opened, leading to skewing issues when the arms pivot, which necessitates heavier, more complex, and costly designs to maintain parallelism and correct alignment.
Innovation Solution
A case erector with first and second arms, each equipped with suction or vacuum devices, utilizing a planar bearing surface with a semi-circular channel to pivot about a virtual center point, allowing the fold to align with this center while the arms move through 45 or 90 degrees to open the case without skewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the shaft about which the two arms pivot is located above or below the box to be opened, then the fold between adjacent sides can be kept co-linear with the pivot axis, but the overall device becomes heavier, more complex, and requires more robust support structures
Solution Approach 1:
The patent transitions from a vertical shaft configuration (one dimension) to a planar bearing surface with semi-circular channel (two dimensions). The arms pivot horizontally along a semi-circular path defined by the bearing surface, allowing the fold to align with the virtual center point while eliminating the need for vertical shaft placement above or below the box.
Solution Approach 2:
The planar bearing surface acts as an intermediary between the arms and the pivot center. Instead of requiring a physical shaft located above or below the box, the bearing surface provides a guided path (semi-circular channel) that mediates the rotational movement, enabling precise alignment without the structural complexity of traditional shaft-mounted configurations.
2Manufacturing precision
If the shaft about which the two arms pivot is located above or below the box, then the fold can be co-linear with the pivot axis, but the arms must extend laterally outward and down to the box, increasing their length and required strength
Solution Approach 1:
The arms transition from extending vertically and laterally (three-dimensional complex extension) to moving horizontally along a semi-circular path (two-dimensional planar motion). This dimensional change shortens the arm length required to achieve the same functional effect, reducing weight while maintaining alignment precision.
3Device complexity
If the fold in the box is located near but not exactly collinear with the shaft about which the two arms pivot, then the structure can be simpler, but the box will skew as it is opened which is generally unacceptable
Solution Approach 1:
The patent employs a semi-circular channel in the planar bearing surface, creating a curved guidance path for the arms. This curvature ensures that the arms always remain tangent to the circular path, automatically maintaining parallelism with the box sides throughout the opening motion and preventing skew, while keeping the structure simpler than traditional shaft configurations.
4Manufacturing precision
If the shaft about which the two arms pivot is located above or below the box, then the fold can be co-linear with the pivot axis, but the structure required to support the erecting arms must be more robust, increasing cost, complexity and overall size
Solution Approach 1:
The planar bearing surface serves as a lightweight intermediary that replaces the need for heavy vertical shafts and robust support structures. By guiding the arms through a semi-circular channel, it achieves precise alignment and stable operation with a much lighter, less complex support structure, reducing both weight and cost.
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
Enables the case erector to open boxes in a non-skewed, square manner, reducing the complexity, weight, and cost of the mechanism by ensuring the arms pivot about the same virtual center as the fold, maintaining parallelism and improving the overall efficiency of the assembly process.
Implementation Method 1
first and second arms, each having at least one suction or vacuum device
Data Source
AI summary
A case erector is configured to open folded cases. In one example, the case erector includes a planar bearing surface. A semi-circular channel is defined in the planar bearing surface about a center point. Additionally, a notch is located so that the planar bearing surface does not extend to the center point of the semi-circular channel. A plate is in contact with the planar bearing surface. The plate has at least one flange sized for travel within the semi-circular channel so that the plate rotates against the planar bearing surface in a circular manner about the center point. A notch is defined in the plate so that the plate does not extend to the center point of the semi-circular channel. An arm is connected to the plate so that the plate and the arm rotate together with respect to the planar bearing surface. In operation, a folded edge of a folded case is positioned at the center point. One or two arms, moved by plates rotating on bearing surfaces, attach to and open the folded case.