Ratchet Apparatus with Internal Spring and Lockable Frame
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Solution Overview
Problem
Conventional strapping and ratchet devices face issues such as manual winding requirements, wear and tear due to uneven rotation, vulnerability of external springs, lack of anti-theft capabilities, short strap longevity, and handle warping, leading to inefficient and durable design problems.
Innovation Solution
A compact, durable ratchet apparatus with a centered aperture and coil springs that apply tension for automatic rewinding, housed within a secure frame with lockable features and internal spring protection, using materials like Dyneema or steel cables for enhanced durability and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the spring is located on the exterior of the frame, then the automatic reeling mechanism is accessible, but the spring becomes vulnerable to damage from elements and drops
Solution Approach 1:
The spring is nested within the frame structure, specifically housed in a dedicated cavity or compartment within the frame body. This internal placement protects the spring from external damage while maintaining the automatic reeling function through proper mechanical linkage to the spool assembly.
2Ease of operation
If the handle pivotally rotates upon the mandrel axle, then the handle can operate the ratchet, but wear and rotational drag occur on the handle and wheel spool
Solution Approach 1:
The pivotal rotation function is extracted from the handle-spool interface and relocated to a dedicated bearing assembly or pivot mechanism separate from the spool hub. This separates the rotational motion requirement from the spool structure, allowing the handle to rotate freely without causing wear to the spool or mandrel axle.
Solution Approach 2:
An intermediary bearing or pivot mechanism is introduced between the handle and the spool assembly. This intermediary component absorbs the rotational wear and friction, allowing smooth handle operation while protecting the spool and mandrel from direct contact and wear during handle rotation.
3Reliability
If the detent pawl plate uses a center pin or spring, then the pawl plate can engage the ratchet, but the plate cannot slide away or engage evenly
Solution Approach 1:
The center pin or spring mechanism is removed from the detent pawl plate assembly. Instead, the pawl plate is designed with sliding surfaces that interface directly with the ratchet teeth and frame, allowing the plate to slide freely into engagement positions without rotational or offset constraints from a central mounting point.
Solution Approach 2:
Instead of mounting the pawl plate on a center pin that rotates or pivots, the design inverts the approach by allowing the pawl plate to slide linearly on fixed mounting points. This sliding motion enables even engagement with the ratchet teeth while allowing the plate to move freely into and out of the engagement position.
4Ease of manufacture
If the strap is sewn, ferruled, or knotted to connect, then the strap can be joined, but longevity is limited
Solution Approach 1:
Traditional mechanical connection methods (sewing, ferrules, knots) are replaced with a integrated molded connection system. The strap ends are thermally molded or injection molded to form permanent, seamless connections to the spool or frame, eliminating weak points from stitching or metal fittings while maintaining ease of manufacturing through molding processes.
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 solution provides automatic tensioning, improved durability, enhanced security through lockable features, and reduced wear and tear, ensuring efficient and long-lasting operation of the ratchet device.
Implementation Method 1
The coil is connected in such a way as to apply tension to the spring when manually rotating the wheel spool in a clockwise direction to pull the strap away from the tie down device in the storage spool. The spring will coil around the axle within the handle spring cavity, applying tension automatically to force rotation of the spool hub in a counter-clockwise direction, rewinding the strap or rope around the hub inside the ratchet discs within the frame body.
Data Source
AI summary
An apparatus and system for improving rope, strap, tie downs, hooks, and nets is provided. Includes a new design whereby the apparatus has a thick walled body made of nylon, aluminum, or stainless steel with a spool and center hub and axle throughout the spool body frame and handle. The apparatus uses multiple coils to automatically retract strap or rope within the spool hub. It also contains a tangential rib opposing the face wheel. The apparatus may have gears on the radius of the wheel, spring loaded slidable pawl plates, or pivotally rotatable pawls or plates which allow the proper engagement of the wheel ratchet. It may also have rope, strap, or belt that is non-cuttable and corrosion, petrol, and chemical resistant used in tie downs and nets. The apparatus may have a lockable body frame, and/or hooks that are lockable to prevent theft.