Therapy Device Quick-Change Adapter for Radial Tool-Free Mounting
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Solution Overview
Problem
Existing therapy devices require significant space for mounting extremity connection units and necessitate tool-based assembly, which is time-consuming.
Innovation Solution
A quick-change adapter that allows for radial connection of limb connection units to the actuator, utilizing a nut and ring collar for positive fit and a clamping lever with a spring-actuated cam for secure, tool-free assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plug-in system is used to attach footrests or armrests to the actuator in the axial direction, then the connection is secure, but the space required for mounting is large and the assembly process is time-consuming
Solution Approach 1:
The patent transitions from axial attachment (one-dimensional approach) to radial attachment (changing the dimension of attachment). The adapter piece is mounted radially on the shaft, and the limb connection unit is attached radially to the adapter piece, eliminating the need for additional axial space while maintaining secure connection through the quick-change adapter mechanism
2Reliability
If a plug-in system is used to attach footrests or armrests to the actuator, then the connection is secure, but the assembly process requires tools and is time-consuming
Solution Approach 1:
The patent implements a dynamic quick-change mechanism where the clamping lever can be manually actuated to quickly release and reattach the limb connection unit. The spring element provides automatic engagement force, and the cam mechanism on the clamping lever creates a mechanical advantage for secure locking, enabling tool-free assembly and disassembly while maintaining reliable connection
Solution Approach 2:
The spring element automatically engages the adapter piece with the limb connection unit when the clamping lever is released, providing self-locking functionality. The system uses its own internal spring force to maintain secure connection without requiring external tools or additional fastening operations
3Volume of moving object
If a quick-change adapter is used for radial connection, then the mounting space is reduced and assembly is quick, but the connection security must be maintained
Solution Approach 1:
The cam mechanism on the clamping lever uses a curved surface that, when actuated, creates a mechanical advantage for gripping the adapter piece. The curved cam surface converts the linear motion of the clamping lever into a radial clamping force that securely locks the connection, maintaining reliability while enabling quick changes
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 quick, tool-free mounting of extremity connection units with reduced spatial requirements and improved positional stability, facilitating easy adaptation and changeover without additional space or tools.
Implementation Method 1
the clamping lever is acted upon by the force of a spring that secures the clamping position
Implementation Method 2
The clamping lever has a cam whose cross-section is adapted to the nut and which extends into the nut in the clamping position
Implementation Method 3
the clamping lever in particular also provides a positive fit that improves the positional stability of the fastener on the ring disk without relying solely on a clamping force or clamping force
Data Source
AI summary
A therapy device, and a quick-change adapter for same, has an actuator mounted in a frame and having at least one axially projecting shaft and an extremity connection unit which can be coupled to the actuator by the shaft. An adapter piece with an annular disc, in which a fixing element is formed at least over a part of its circumference, is associated with the shaft for the realization of a quick-change adapter, and a fastener has a ring having an annular opening, the width of which is adapted to the diameter of the annular disk, on the inside of which a counter element corresponding to the fixing element is formed and at one free end of which a clamping lever is arranged, which can be adjusted between a clamping position fixing the fastener to the adapter piece and a release position releasing the fastener.