Blocking Device for Spring Brake Cylinder Security
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Solution Overview
Problem
Unauthorized users can mechanically release the parking brake in vehicles by inserting a caging bolt into the spring brake cylinder's entry aperture, compromising vehicle security.
Innovation Solution
A blocking device is attached to the spring brake cylinder's entry aperture, featuring a blocking fastener with cylindrical recesses and a threaded shaft, a fastener receiver with a radially extending base, and a retaining clip, which prevents unauthorized access by requiring a specialized release tool for authorized users to operate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a caging bolt is inserted into the entry aperture to mechanically release the parking brake, then the spring brake can be disengaged when air pressure is lost, but unauthorized users may also mechanically release the parking brake
Solution Approach 1:
A blocking device is introduced as an intermediary component between the entry aperture and the caging bolt. This blocking device includes a blocking fastener with a shaft that extends into the entry aperture, preventing unauthorized caging bolt insertion. The blocking device can only be removed by authorized personnel using a specialized release tool, thus maintaining the reliability of parking brake engagement while preventing unauthorized mechanical release.
Solution Approach 2:
The blocking device is installed in advance on the spring brake cylinder before any caging operation. The blocking fastener is positioned to obstruct the entry aperture, and the retaining clip is engaged to secure it. This preliminary blocking action ensures that even if unauthorized users attempt to use a caging bolt, they cannot insert it into the aperture without first removing the blocking device, which requires authorized tools and procedures.
2Object-affected harmful factors
If a blocking device is added to prevent unauthorized access, then vehicle security is enhanced, but the device complexity increases
Solution Approach 1:
The blocking device is segmented into distinct functional components: a blocking fastener with head and shaft, a fastener receiver with insertion portion and base, and a retaining clip. This segmentation allows each component to perform its specific function while maintaining overall simplicity. The blocking fastener prevents access, the fastener receiver provides mounting, and the retaining clip secures the assembly, collectively enhancing security without excessive complexity.
Solution Approach 2:
The blocking device is designed to be self-securing through the retaining clip that engages with the shell and fastener receiver, automatically locking the blocking fastener in place without requiring additional fastening operations. The complementary non-cylindrical shapes of the channel and insertion portion provide self-alignment and prevent relative rotation, eliminating the need for complex alignment procedures during installation and maintenance.
Data Source
AI summary
A blocking device for attaching to an entry aperture structure of a spring brake cylinder of a vehicle includes a blocking fastener having a head and a shaft extending from the head. The head has a plurality of cylindrical recesses that extend generally parallel to the shaft. At least a portion of the shaft is threaded. A fastener receiver has an insertion portion and a base extending generally transversely to the insertion portion. The insertion portion has an interior surface that is threaded and is configured to receive the shaft of the blocking fastener. The base has a first tier that extends generally radially from the insertion portion and has a diameter that corresponds to the diameter of the entry aperture structure such that the base engages the entry aperture structure radially. A fastener receiving component is disposed on the shaft.