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US 4,521,992 AGranted
Ramp-operated mechanical gate systems
OwnerDonald C. Campbellinventor
Life of this patent
Estimating the term…
Abstract
A ramp-operated mechanical gate system, including vertically-swinging gate, sliding gate and side-swinging gate embodiments which utilize collapsible ramps to supply energy to open a gate so that the gate is opened automatically when the collapsible ramp is depressed by an approaching vehicle and is closed automatically when the vehicle drives through the gate and the ramp is no longer depressed.
Claims7
A ramp-operated mechanical gate system, comprising:
- a gate support structure;
- a gate structure pivotally attached to said gate support structure;
- a collapsible ramp of sufficient size and strength to withstand the weight of a motor vehicle and offset from said gate support structure;
- a first rod rigidly attached to and extending substantially perpendicularly from said collapsible ramp toward said gate support structure which turns when said collapsible ramp is depressed;
- a lever arm attached to and extending substantially perpendicularly from said rod, and
- power transfer means connected between said lever arm and said gate structure such that said gate structure opens when said collapsible ramp is depressed, and having at least one spring.
3 more elements
A ramp-operated mechanical gate system, comprising:
- a gate support structure;
- a substantially rectangular gate structure slidably attached to said gate support structure;
- a collapsible ramp of sufficient size and strength to withstand the weight of a motor vehicle and offset from said gate support structure;
- a rod rigidly attached to and extending substantially perpendicularly from said collapsible ramp toward said gate support structure which turns when said collapsible ramp is depressed;
- a lever arm attached to and extending substantially perpendicularly from said rod;
- power transfer means connected between said lever arm and said substantially rectangular gate structure such that said substantially rectangular gate structure slides open when said collapsible ramp is depressed and having at least one spring, and
- a counterweight attached to said power transfer means whereby said substantially rectangular gate structure slides closed when said collapsible ramp is released.
4 more elements
Dependencies are inferred from the claim text.