Multifunctional Draw-Bar Backpack with Retractable Shoulder Straps

The problem

In traditional draw-bar backpacks, the shoulder straps are attached to the top or sides of the bag body. When the user pulls the bag behind them using the telescopic handle, these straps hang loose. On smooth airport floors, they may not be an issue, but on rough surfaces, they drag and collect dirt. More critically, in busy travel hubs, loose straps can get caught in security screening conveyors or escalators, causing jams or damage. Existing solutions often rely on manual intervention—users must stop, unclip the straps, fold them, and secure them with Velcro or buckles before rolling the bag. This adds friction to the travel experience and is often forgotten, leading to damaged straps or lost items. There is a need for a passive, automatic mechanism that secures the straps simply by changing the configuration of the bag from “carry-on” mode to “rolling” mode.

The solution

The patent describes a backpack body with a rigid back plate. The shoulder straps are not permanently fixed to the exterior surface; instead, their lower ends pass through mounting grooves in the back plate and attach to internal rotating rollers. A telescopic pull rod runs vertically through a first circular groove at the top of the back plate. Inside the handle housing, a connecting pipe features a helical groove that interacts with spiral protrusions on the pull rod shaft. As the pull rod is pushed down, it rotates the connecting pipe. This rotation is transferred via a driving bevel gear to two driven bevel gears, which turn the internal rollers in opposite directions. One roller winds the left strap, and the other winds the right strap, pulling them tight and storing them within the thickness of the back plate. A secondary sliding block mechanism ensures the handle remains locked in the extended position for pulling, and releases or engages based on the pressure plate’s interaction with inclined planes.

Who it is for

• Luggage Brands looking to differentiate their business travel lines with a unique, functional selling point that solves a common pain point (dirty/tangled straps).
• Amazon Sellers in the high-volume travel category who need products with demonstrable utility to reduce negative reviews related to durability and usability.
• Corporate Gift Suppliers seeking premium, tech-forward accessories for frequent flyers, where ease of use at security checkpoints is valued.
• Outdoor & Commuter Manufacturers whose users transition frequently between carrying the bag on their back and rolling it over uneven terrain.

How it works

The main parts

Operating Steps

1. Rolling Mode Setup: The user pushes the pull rod down to its lowest position.
2. Helical Engagement: The spiral protrusions on the rod engage with the helical grooves in the connecting pipe, forcing the pipe to rotate.
3. Gear Transmission: The rotating pipe turns the driving bevel gear, which meshes with the driven bevel gears connected to the rollers.
4. Strap Retraction: The rollers spin in opposite directions, winding both shoulder straps neatly into the back plate recesses.
5. Locking: The pressure plate slides down, engaging the sliding blocks via inclined planes to secure the handle in the closed position.
6. Carry Mode: Pulling the rod up reverses the process; the rollers unwind, releasing the straps for shoulder carry.

Applications

Airport Security Checkpoints

At TSA-style screenings, bags are placed on conveyors. Loose straps can jam belts or get torn. This design allows the traveler to quickly lower the handle, retracting all external fabric, ensuring a clean, snag-free profile for the X-ray machine.

Public Transit Commuting

On subways and buses, hanging straps can catch on door frames or handrails as passengers exit. Retracting the straps creates a compact rectangular footprint, making it easier to maneuver through crowded aisles without bumping into other commuters.

Hotel and Office Storage

When storing the bag under a desk or in a hotel closet, dangling straps take up unnecessary space and look untidy. Fully retracted, the backpack presents a sleek, uniform back panel, maximizing vertical stacking efficiency in small spaces.

Outdoor Travel and Hiking

For travelers moving between airports and hotels via shuttle vans, straps can flap in the wind or get dirty from vehicle interiors. The enclosed mechanism protects the strap material from abrasion and environmental debris during transit.

Where it is less suitable

• Ultra-Lightweight Packs: The added weight of the metal gears, rollers, and rigid back plate makes this unsuitable for minimalist hikers or runners who prioritize weight reduction over convenience.
• Custom Fabric Bags: The mechanism requires precise integration into a rigid frame; it cannot be easily retrofitted into soft-sided, unstructured tote bags.
• High-Frequency Carry Use: If a user mostly carries the bag on their back and rarely rolls it, the complexity of the retraction system may not justify the cost compared to simple clip-in straps.