Operating Table Column Cylindrical Guide Offset Keys
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Solution Overview
Problem
Existing table columns for operating tables experience residual play in the direction of rotation about their vertical axis, leading to instability and wobbling of the patient support surface, which can disrupt surgical procedures, especially in cranial and brain operations where stability is critical.
Innovation Solution
The table column design incorporates a cylindrical guide with two feather keys that are offset to each other transversely, engaging in a longitudinal groove to prevent rotation about the vertical axis, utilizing a readjustment device with spring force and disc springs to maintain stability, and is connected to a lifting drive for height adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a cylindrical guide with a single key is used to connect the column head to the column head support, then the height adjustment function is achieved, but residual play and wobbling occur in the direction of rotation about the vertical axis
Solution Approach 1:
The single key connection is segmented into two offset keys (first key and second key) arranged at different positions around the cylindrical guide's longitudinal axis. This segmentation allows each key to independently engage with the longitudinal groove, creating multiple constraint points that eliminate torsional play while maintaining the height adjustment capability through the longitudinal groove's sliding action.
Solution Approach 2:
The two keys are positioned asymmetrically with an offset arrangement relative to each other around the cylindrical guide's longitudinal axis. This asymmetric positioning ensures that the keys engage the longitudinal groove at different angular positions, creating a distributed constraint system that prevents rotation about the vertical axis while allowing vertical movement for height adjustment.
2Reliability
If the engagement elements of the two keys are arranged offset to one another, then pretension is generated in the cylindrical guide eliminating torsional play, but the device complexity increases
Solution Approach 1:
The cylindrical guide structure serves multiple functions simultaneously: it provides the longitudinal groove for height adjustment, acts as the mounting structure for both keys, and functions as the rotational constraint mechanism. The offset keys are integrated into this universal structure, allowing the same cylindrical guide to handle both vertical movement and rotational prevention without requiring separate components.
Solution Approach 2:
The two offset keys and the longitudinal groove are merged into a single integrated cylindrical guide assembly. Rather than being separate components, the keys are positioned within the cylindrical guide structure and engage with the groove that is part of the same assembly, reducing the number of discrete parts while achieving the dual function of height adjustment and torsional rigidity.
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
This design effectively eliminates torsional play, ensuring the patient support surface remains stable and rigid, enhancing the safety and precision of surgical interventions by preventing unwanted movement during operations.
Implementation Method 1
Each feather key (26) can be assigned a readjustment device (29) for automatic readjustment of its seat within the longitudinal groove (24). The readjustment device can be designed to be operated by spring force. It may also include a set of disc springs.
Data Source
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AI summary
The invention relates to a table column (1) for an operating table, comprising a column head support (6), a column head (7) accommodated in the column head support (6) and height-adjustable relative to same, a lifting drive (21) for adjusting the height of the column head (7) relative to the column head support (6), and a cylindrical guide (23) which connects the column head (7) to the column head support (6) and functions to vertically guide the column head (7) during the height adjustment thereof, wherein the cylindrical guide (23) has a longitudinal groove (24) and two keys (26) engaging therein in order to secure the cylindrical guide (23) against rotation about its vertical axis, and wherein each key (26) comprises a main body and an engaging element protruding along an engaging direction, which engages into the longitudinal groove (24) in the engaging direction, wherein the engaging elements of the two keys (26) are arranged offset to one another transverse to the longitudinal axis of the longitudinal groove (24), such that a pretensioning in the cylindrical guide (23) is generated transverse to the longitudinal axis of the longitudinal groove (24).