Automatic safety brake actuation tongue for towed vehicles
US4453620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Mar 15, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T7/20
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A tongue is provided for a towed wagon having conventional variable hydraulic and emergency brake systems. The tongue has three telescopically disposed tubes with a clevis on the outer tube for connection to a drawbar. A slide member is moved in said outer tube by a connected drawbar. The slide member has a cam which engages a spring loaded plunger which engages a latch on the intermediate tube to lock the outer and intermediate tubes together. The connected drawbar also moves the outer and intermediate tubes with respect to each other before they are locked together. This relative movement causes an emergency brake control means to be released, and moves to its breaking position only when the drawbar is disconnected. A surge brake mechanism is interconnected between the intermediate and inner tubes to operate the variable hydraulic brake system of the vehicle as the inner tube moves forwardly over the intermediate tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.