Spring-Biased Projection Lock for Display Hook Theft Prevention
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Solution Overview
Problem
There is a need for devices and systems that prevent the easy removal of small, expensive items from display hooks, showcases, cabinets, and fixtures with doors, drawers, and sliding doors, as these items are often targeted by shoplifters due to their accessibility.
Innovation Solution
A locking device comprising an outer housing with a cylindrical shell and a barrel spring, which biases the shell to an unlocked position, and a cylinder plug with a keyhole and tumblers, designed to secure display hooks and other fixtures by extending a projection into a channel to lock the wire or peg hook, allowing secure locking and easy unlocking with a key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If merchandise is displayed on protruding rods or hooks for easy customer access, then customer convenience and product visibility are improved, but the ease of unauthorized removal by shoplifters increases
Solution Approach 1:
The locking device is segmented into multiple functional components: an outer housing for structural support, a cylindrical shell for key operation, a cylinder plug with tumblers for security, and a projection mechanism for engagement. This segmentation allows the system to provide both easy customer access (through unlocked display) and theft prevention (through secure locking capability) by separating the display function from the security function.
Solution Approach 2:
The locking device acts as an intermediary between the merchandise display system and the security requirement. It can be installed on display hooks, rods, or fixture doors, providing a mediating locking mechanism that doesn't interfere with normal customer viewing and access when unlocked, but provides security when locked. The device mediates between the conflicting requirements of accessibility and security.
2Object-affected harmful factors
If a locking mechanism is added to display hooks and fixtures to prevent theft, then security against shoplifting is improved, but the device complexity increases
Solution Approach 1:
The locking device is designed with universal applicability to multiple display fixture types including hooks, rods, and fixture doors. The outer housing and engagement mechanism can accommodate different installation scenarios, while the key-cylinder locking mechanism provides a standardized security function. This multi-functionality reduces overall system complexity by using a single locking device design across different application contexts rather than requiring specialized locks for each fixture type.
Solution Approach 2:
The locking device employs a spring-loaded projection mechanism that automatically engages with the display fixture structure when installed, providing self-securing functionality. The barrel spring automatically biases the projection into the engaged position, eliminating the need for additional fastening operations or complex adjustment mechanisms. This self-service characteristic reduces device complexity by incorporating automatic engagement features.
3Reliability
If a spring-loaded projection mechanism is used to secure the lock, then the locking reliability is improved, but the force required to operate the lock increases
Solution Approach 1:
The locking mechanism transitions from a static engagement to a dynamic spring-loaded engagement. The barrel spring provides continuous force to bias the projection into the engaged position, creating a dynamic locking system that maintains reliable engagement through elastic force rather than rigid mechanical constraint. This dynamic approach improves reliability while allowing for controlled operation through key actuation.
Solution Approach 2:
The barrel spring is pre-loaded during assembly to store elastic potential energy, creating a preliminary biasing force that automatically engages the projection with the fixture structure when the lock is installed. This preliminary action ensures reliable locking engagement without requiring additional force during operation, as the spring force is already prepared and applied in advance.
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
The locking device effectively secures display hooks and other fixtures, preventing unauthorized removal of items while allowing easy access when the correct key is used, thus reducing shoplifting of small, high-value items.
Implementation Method 1
a barrel spring at least partially contained within the interior of the outer housing. The barrel spring is configured to bias the projection of the cylindrical shell away from the first channel to an unlocked position
Data Source
AI summary
Locking devices that may be used with product display hooks, cabinets, and drawers are provided. A locking device according to one implementation comprising a housing and a shell. The housing includes an outer wall that defines an interior. The housing further includes a channel extending at least partially through the interior of the housing. The shell includes a projection. The shell is at least partially disposed within the interior of the housing and is moveable in a longitudinal direction within the interior of the housing. In an unlocked position, the projection is biased away from the first channel. In a locked position, the projection is maintained in the first channel.