ALTIMETER

• US 3,595,077 A
• Filed: 05/21/1969
• Issued: 07/27/1971
• Est. Priority Date: 05/21/1969
• Status: Expired due to Term

• Current Assignee: Perkins Earl Stuart
• Original Assignee: Perkins Earl Stuart
• Inventors: PERKINS EARL STUART
• Application Number:
  US04/826,529
• Time in Patent Office: 797 Days
• US Class Current: 73/178.00R
• CPC Class Codes: G01C 23/00 Combined instruments indicating more than one navigational value, e.g. for aircraft; Combined measuring devices for measuring two or more variables of movement, e.g. distance, speed or acceleration

Abstract

An altimeter which continuously presents to the pilot of an aircraft the altitude of the aircraft above ground and in which the ground reference moves relative to a fixed sea level reference with inputs to the altimeter being supplied by barometric altimeters and absolute altimeters. A pair of moving belts are supported between two pairs of rollers and carry indicia for showing the relationship between the aircraft, sea level and the ground beneath the aircraft.

Claims

1. An aircraft instrument comprising, a first movable indicia of an aircraft, a barometric altimeter connected to drive said first movable indicia, an absolute altimeter, a second movable indicia representative of the earth'"'"''"'"'s surface and driven by the outputs of the absolute and barometric altimeters, a scale mounted on said instrument adjacent The first and second indicia, and means for moving said scale as a function of the Kollsman number.

2. An aircraft instrument comprising a first movable indicia of an aircraft, a barometric altimeter connected to drive said first movable indicia, an absolute altimeter, a second movable indicia representative of the earth'"'"''"'"'s surface and driven by the outputs of the absolute and barometric altimeters, a first endless belt upon which said first indicia is mounted, a pair of rollers which support said first endless belt and said barometric altimeter connected to drive said first endless belt, a second endless belt upon which said second movable indicia is mounted, a second pair of rollers which supports said second belt, and the absolute and barometric altimeters connected to drive said second endless belt.

3. An aircraft instrument according to claim 2 wherein one of said endless belts is mounted within the other and the outer endless belt is transparent.

4. An aircraft instrument comprising a first movable indicia of an aircraft, a barometric altimeter connected to drive said first movable indicia, an absolute altimeter, a second movable indicia representative of the earth'"'"''"'"'s surface and driven by the outputs of the absolute and barometric altimeters, and an alarm connected to the absolute and barometric altimeters to produce an alarm signal when the difference in detected altitude of the two altimeters becomes less than a predetermined amount.

5. An aircraft instrument comprising, a first movable indicia of an aircraft, a barometric altimeter connected to drive said first movable indicia, an absolute altimeter, a second movable indicia representative of the earth'"'"''"'"'s surface and driven by the outputs of the absolute and barometric altimeters, a frame with a window through which said first and second indicia are visible, and a fixed reference formed on said frame adjacent said window and representative of sea level elevation.

6. An aircraft instrument according to claim 5 comprising, a first pair of rollers, a first endless belt mounted on said first rollers with the first indicia mounted thereon, a second pair of rollers, a second endless belt mounted on said second pair of rollers and said second indicia mounted thereon, and one of said endless belts mounted within the other one and said other one being transparent.