Bolt Holding Device with Spring Retention for Tool-Free Assembly
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Solution Overview
Problem
Existing bolt holding devices require tools for assembly and are not easily assembled during final assembly, lacking a quick and tool-free method for securing bolts.
Innovation Solution
A bolt holding device with an insertion sleeve, retaining and guiding elements, and a spring energy store that allows for tool-free assembly and secure bolt retention, utilizing a cylindrical unthreaded bolt that can be inserted and fixed in both devices with opposite orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bolt holding device uses spring plates and bayonet lock for secure fastening, then the bolt retention reliability is improved, but the assembly complexity and tool requirement increase
Solution Approach 1:
The bolt holding device is divided into separate functional components: a retaining element with retaining arms that can be independently assembled, a bolt receiving element, and a spring energy store. This segmentation allows each component to be simpler while maintaining overall reliability through their coordinated function.
Solution Approach 2:
The spring energy store automatically engages the retaining arms with the bolt receiving element when the bolt is inserted, eliminating the need for manual tool-assisted assembly. The device assembles itself through the elastic deformation and recovery of the spring-loaded retaining arms.
2Reliability
If a bolt holding device requires tool-assisted rotation for bolt insertion, then the bolt fastening security is improved, but the ease of operation during final assembly deteriorates
Solution Approach 1:
The spring-loaded retaining arms automatically engage and lock the bolt in place through elastic deformation when inserted, eliminating the need for tool-assisted rotation. The spring mechanism provides self-locking functionality that ensures secure fastening without requiring additional tools or complex assembly operations.
Solution Approach 2:
The retaining arms are designed to be dynamically flexible during insertion, allowing easy passage of the bolt, then automatically spring into a locked position to provide secure retention. This dynamic behavior transitions the device from an easy-to-insert state to a securely locked state without requiring tools.
3Force
If spring plates are used for clamping the bolt, then the bolt retention force is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The clamping function is segmented into a dedicated spring energy store component that generates the retaining force, separate from the bolt receiving element. This allows the main body to be simpler to manufacture while the spring component, though more complex, is a standardized element that can be produced independently and assembled.
Solution Approach 2:
The spring energy store utilizes elastic deformation parameters to generate the required retention force. By selecting appropriate spring material properties and geometric parameters (wire diameter, coil diameter, number of turns), the desired clamping force is achieved through material science rather than complex mechanical structures.
4Reliability
If a bolt holding device is designed for secure bolt fastening, then the connection reliability is improved, but the assembly time and productivity during final assembly decrease
Solution Approach 1:
The spring-loaded retaining arms automatically engage and lock the bolt in place through elastic deformation when inserted, eliminating the need for manual tool-assisted assembly. The device assembles itself through the elastic deformation and recovery of the spring-loaded retaining arms, achieving both speed and reliability.
Solution Approach 2:
The spring energy store is pre-loaded during manufacturing to store elastic energy that will be automatically released during assembly to engage the retaining arms. This preliminary preparation of the spring mechanism enables rapid self-locking during final assembly without requiring additional assembly steps or tools.
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 and easy assembly of furniture pieces without tools, providing secure bolt retention and preventing pull-out, while allowing for efficient connection of two pieces of furniture through a connection system.
Implementation Method 1
a spring energy store (122) which stores energy in a prestressed state
Implementation Method 2
The clamping disc (131) is designed to be elastic-deformation-resistant
Data Source
Figure 1~2
Figure 3~4
Figure 5~8
AI summary
The invention relates to a bolt holding device with a bolt draw-in device for fastening a bolt, to a system with two such bolt holding devices, and also to a furniture item with two furniture item parts and a connecting system. The bolt holding device has a retaining device which blocks the bolt draw-in device when the bolt is not placed. In addition, it has a release element which can be actuated by means of the bolt to be fastened and which is connected to the retaining device with a force fit and/or form fit. The bolt draw-in device can be unblocked upon actuation of the release element. The present invention develops a bolt holding device, which can be mounted quickly and without problem, for the largely tool-free final mounting of a bolt, and also a connecting system with two such bolt holding devices.