Pickup Truck Tailgate Latch With Intermediate Positioning
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Solution Overview
Problem
Traditional truck tailgate latches lack adjustability, limiting the tailgate's positioning options to only vertical and fully downward positions, failing to provide intermediate angled positions that could enhance safety and usability for securing items of varying lengths within the truck bed.
Innovation Solution
A latch assembly that includes a package interior defining body with a sector, pawl, and cam, allowing the tailgate to be rotated between vertical, intermediate angled, and fully downward positions, with a redesigned spring-loaded pawl engaging at various locations for secure positioning, and the option for a powered version with motor actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional cable-based latch system is used, then the structure is simple, but the tailgate positioning is limited to only vertical and fully downward positions without intermediate angled positions
Solution Approach 1:
The latch mechanism transitions from a static cable-based system to a dynamic sector-pawl-cam system that enables multiple locked positions. The sector gear with multiple engagement points allows the tailgate to be secured at various angles, providing intermediate positioning capability while maintaining mechanical simplicity through the use of a ratchet-based locking mechanism.
Solution Approach 2:
The continuous rotation range of the tailgate is segmented into discrete locked positions through the sector gear design. The sector is divided into multiple engagement zones that correspond to specific angles, allowing the pawl to lock the tailgate at predetermined intermediate positions while maintaining structural simplicity.
2Adaptability or versatility
If a cam and sector mechanism is added to enable intermediate positions, then tailgate adjustability is improved, but the device complexity increases
Solution Approach 1:
The cam, sector, and pawl are merged into an integrated locking mechanism where the cam rotates to drive the sector, and the pawl engages with the sector teeth to lock positions. This combination of components achieves multiple positioning capability while minimizing the number of separate mechanisms needed, as all three elements work together in a coordinated fashion within a single latch assembly.
Solution Approach 2:
The spring-loaded pawl automatically engages with the sector teeth to lock the tailgate at intermediate positions without requiring additional actuators or control systems. The mechanism uses the rotational motion of the cam itself to drive the locking action, making the system self-regulating and reducing overall complexity.
3Reliability
If a spring-loaded pawl is used for secure positioning, then positioning reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The sector is designed with variable tooth spacing and engagement point parameters that correspond to different tailgate angles. By adjusting the geometric parameters of the sector teeth and cam profile during manufacturing, the system achieves reliable positioning at multiple angles while using standard machining processes, balancing manufacturing ease with positioning reliability.
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 secure adjustment and positioning of the tailgate at multiple angles, improving the ability to secure items of different lengths within the truck bed, enhancing safety and usability by allowing for intermediate locked positions and facilitating easier operation with a motorized option.
Implementation Method 1
A latch assembly is disclosed which includes a package interior defining body adapted to being secured to a side of the tailgate and enclosing each of a sector, pawl and cam. A main pivot support is adapted to being secured to an opposing side location of the tailgate, the pivot support including a rotatable portion slaved to the sector. Rotation of the cam in turn actuates the pawl to disengage from the sector, permitting in turn rotation of the tailgate between each of vertical, intermediate angled and fully downwardly rotated horizontal positions relative to the supporting sidewalls of the truck pickup bed.
Implementation Method 2
The cam component actuates the pawl to disengage from the sector through rotational motion, utilizing mechanical advantage to convert small rotational movements into larger positioning adjustments of the tailgate at multiple angular positions.
Data Source
AI summary
A latch assembly for pivotally securing a tailgate to a truck bed including a body adapted to being secured to a side of the tailgate and enclosing each of a pawl and sector. A pivot support is adapted to being secured to each of first and second opposing side locations of the tailgate in alignment with a main pivot extending through said sector. The pawl exhibits projecting portions which oppose circumferentially offset and radial projection portions of the sector. A torque is exerted by the pawl against the sector at selected downward and return upward pivoting directions, permitting rotation of the tailgate between each of upright, intermediate and down positions.