# Early Car Wheel Traction Device

> A 1915 patent for a metal device clamped to a car wheel to improve traction on slippery surfaces.

- **Patent:** US 1141798
- **Original title:** Vehicle-scotch.
- **Owner:** Individual
- **Granted:** 1915
- **Status:** Public domain (expired)
- **Times cited:** 0
- **Field:** automotive, mechanical

## What it does

This patent describes a device designed to wrap around a vehicle's wheel, specifically to provide better grip on roads covered in snow, ice, or mud. It consists of a flexible metal band that encircles the tire. Attached to this band are cross-members, essentially metal bars or plates, that extend outward from the wheel's circumference. When the wheel rotates, these cross-members dig into the slippery surface, preventing the tire from spinning freely and helping the vehicle move forward. The patent claims a 'vehicle-scotch' comprising a flexible band and 'cleats' or cross-members for traction.

## What it does NOT cover

- Does not cover tire chains that are a continuous loop around the tire.
- Does not cover devices that attach to the vehicle's chassis instead of the wheel.
- Does not cover pneumatic tires with specialized tread patterns.
- Does not cover the use of sand or other loose materials for traction.
- Does not cover devices that are permanently affixed to the wheel rim.

## The clever bit

The innovation lies in the simple, clamp-on design that could be easily attached and removed from existing wheels, providing enhanced grip without requiring a complete redesign of the wheel or tire itself.

## Real-world examples

1. Early 20th-century automobiles
2. Traction devices for horse-drawn carriages (conceptually similar)

## Why it matters

This patent represents an early attempt to solve the common problem of vehicle traction in adverse weather conditions, predating widespread adoption of modern tire technology. It highlights the ingenuity of early automotive engineers in addressing practical challenges with mechanical solutions.

## Frequently asked questions

### What does Early Car Wheel Traction Device cover?

A 1915 patent for a metal device clamped to a car wheel to improve traction on slippery surfaces.

### Who owns patent US 1141798?

Individual owns this patent, granted in 1915.

### When does this patent expire?

This patent has expired and is now in the public domain — anyone can use the invention freely.

### What problem does this patent solve?

This patent represents an early attempt to solve the common problem of vehicle traction in adverse weather conditions, predating widespread adoption of modern tire technology. It highlights the ingenuity of early automotive engineers in addressing practical challenges with mechanical solutions.

### What does this patent NOT cover?

Does not cover tire chains that are a continuous loop around the tire.

**Full plain-English explainer:** https://patentbrief.org/patent/us/1141798/zipper-slide-fastener

**Original patent:** https://patents.google.com/patent/US1141798

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._


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