1 kA Bank Road, Allahabad-211002, India
Khitchdee Developer Tools (OPC) Pvt. Ltd. CIN U62013UP2023OPC191836
We are a design company. We design non-motorised land-vehicles, such as bicycles and trolleys.
We also produce a design tool.
Load-carrying Trailer
Summary
We are designing a load-carrying trailer that can be pulled manually or attached to a roadster bicycle. It is a lightweight and balanced design that can be moved at speeds, faster than existing tricycle designs.
Axles
The trailer consists of two circular cross-section solid steel axles.
- A 60cm wide, 16mm load-bearing rear axle, which rolls on 4 14in bicycle wheels (a pair at each end). This axle starts as a 20mm rod that is machined down to 16mm and threaded using a 1mm thread, leaving out a 70mm gap at the center.
- A 1m wide, 20mm forward axle, designed to maintain lateral-stability. This rolls on a single 16in bicycle wheel at each end. This is a 20mm rod that is threaded with a 1mm thread.
Structural Elements
All structural elements for pulling, steering, strengthening and frame-building are made using lightweight (rectangular cross-section, hollow) steel beams. These beams are strengthened at their attachment points with iron inserts. This keeps weight low while providing strength where needed.
Trailer Chassis Assembly
Both axles are pulled by a single beam pair. This beam pair has 16mm holes an its ends (for the rear axle) and 20mm holes near its center (for the forward axle).
Each axle is steered by a separate
Assembling and attaching to a bicycle :
The pulling beams are attached to the rear wheel spindle. The 2 pairs of steering beams are attached to the seat-post.
Standalone Chassis Setup:
The pulling beams are attached to the bottom of the handle. The steering beams to the top.
Building the frame on the chassis
Axles
20mm 1m
16mm 60cm
Wheels
16in x 2
14in x4
Beams
pulling x 2
rear axle steering x 2
forward axle steering x 2
Trailer frame
Frame strengthening parts
Handlebars
Brakes
Seat
Tools
Attaching the Rear Axle
The rear axle is a 20mm diameter steel rod machined down to 16mm from both sides, leaving out 70mm at the center. A 1mm thread is cut into both 16mm sides. The rear ends of the pulling beams slide into both sides of the center-bump and are tightened in from the outside. The steering beams slide into the 2 ends of the axle and are tightened out from the inside. A pair of 14in wheels is tightened in at both ends just outside the steering beams.
Attaching the Forward Axle
The pulling beams slide into the center of this axle from both sides and are tightened in place from the inside and the outside. The steering beams slide into both ends of this axle and are tightened out from the inside. Then the 16in wheels are tightened in from the outside.
Attaching the chassis to a bicycle
The handlebar, braking system and seat are redesigned to account for the additional load the bicycle will pull.
The frame of the bicycle is bolstered with lightweight steel beams that also provide a mechanism to extend the trailer-frame forward when it is attached to the bicycle.
Attaching the chassis to pulling handle
Trailer frame
The frame design promotes keeping the weight of the load, balanced along the center-line of the trailer. This helps reduce tyre-road friction, hence increasing speed.
When attaching to the bicycle, a frame-extension is attached to the bolstered bicycle frame. This extends the length of the trailer-frame to the front of the bicycle. 2m long loads can be carried in this mode.
Transporting the trailer
The trailer’s dimensions have been designed taking into consideration that it might need to be transported in the trunk of a car.
Usage scenarios
Some examples of how the trailer could be used.
The purpose of the trailer is to move a load from its current location to another location. The trailer itself, once loaded, can be moved on paved road by attaching to a bicycle or even an unpaved road by pulling manually.
Team
Director (DIN 191836)
Rohit Agarwal is a process designer, specially processes to design and construct things.
He designed video compression algorithms for Intel Corporation and a digital multimedia delivery system for the ISO.
He has programmed in Java, C and C++ and is now programming in Swift.
He has a B. Tech. in Electrical Engineering from I.I.T. Kanpur and an M.S. in Electrical and Computer Engineering from the University of California, Irvine.
He has 17 issued U.S. Patents.
He drives, modifies and maintains cars, motorcycles and bicycles.