RU238882U1 - DEVICE FOR ADJUSTING THE PILOT'S SEAT HEIGHT ADJUSTMENT MECHANISM - Google Patents

Abstract

This utility model relates to aircraft technology and is designed for adjusting the pilot's seat height adjustment mechanism. The device for adjusting the pilot's seat height adjustment mechanism comprises a base, two guides with end-position indicators and marks, a jumper, a locking pin, a clamping bolt, and a bracket. The technical result ensures precise adjustment of the seat's "extreme" (upper and lower) positions in the aircraft cockpit.

Description

The utility model relates to aviation technology and is intended for carrying out work on adjusting the height adjustment mechanism of a pilot's seat.

The aircraft's ejection and shock absorption system (ECS) (ECS K-37-800M. Technical Operation Manual KAS-9200-0 RE) includes a pilot seat height adjustment system. The adjustment system is designed to move the seat up and down to ensure the pilot's eye position is at the required field of view.

The height adjustment system consists of two screw mechanisms, a mechanical system of shafts and gears, and an electric adjustment mechanism (EAM). The lower points of the screw mechanisms are attached to the aircraft floor, and the upper points to the seat.

The MRP consists of an electric motor and a splined sleeve that can rotate in both directions, as well as an automation unit with a microswitch that turns the electric motor on and off at adjustable intervals.

The MRP, by rotating a splined sleeve through shafts and gears, transmits torque to the screw mechanisms, causing them to increase or decrease their length. This change in length causes the seat to rise or fall relative to the aircraft floor.

The chair stops in the “extreme” (upper and lower) positions by closing and opening the electrical circuit through the automatic pressing of the microswitch button from the MRP.

The operation of the MRP and, as a result, the raising and lowering of the chair to the required intermediate position, is controlled by moving the toggle lever located on the chair in the up-down direction.

During the operation of the CAS, it becomes necessary to replace failed MRPs.

After installing the MRP on the seat, it requires adjustment, as the factory settings for the MRP include a limited time interval between engine activation and deactivation, which prevents the seat from traveling long enough between its "extreme" (lower and upper) positions, or for the MRP deactivation moments to coincide with the seat's reaching the "extreme" positions specified by the seat's design. The purpose of adjustment is to establish the required range of travel (length change) for the screw mechanisms with automatic stop at the seat's "extreme" positions in the aircraft cockpit. This is accomplished by monitoring the screw mechanism lengths achieved during the electrical circuit opening and closing (i.e., the MRP's activation and deactivation) with a universal measuring instrument (e.g., a ruler or caliper).

The disadvantage of adjusting the MRP after replacement is the inaccurate adjustment of the timing of closing and opening the electrical circuit to stop the seat in a strictly defined position relative to the aircraft floor, and, consequently, inaccurate setting of the upper and lower positions of the seat.

The objective of the utility model is to eliminate the above-mentioned drawback.

The task is solved by a device that allows for precise adjustment of the “extreme” positions of the closing of the MRP electrical circuit.

The device is presented in drawings.

Fig. 1 shows the arrangement of the device for adjusting the pilot's seat height adjustment mechanism in the lower position.

Fig. 2 shows the arrangement of the device for adjusting the pilot's seat height adjustment mechanism in the upper position.

Fig. 3 shows the mechanism of the screw chair.

The device consists of a base 1, guides 2, locking pin 3, pressure bolt 4, bracket 5, extreme position marks 6, 7, indicators 8 and jumper 9 with a spring.

The extreme position marks 6, 7 are applied to the guides 2, the indicators 8 are applied to the base 1.

The marks and indicators are made in contrasting colours.

Bracket 5 determines the required position of the device relative to the power frame of the chair, and bolt 4 secures the device to the power frame.

Guides 2 are connected to each other by a jumper 9 and move freely in the holes of the base 1.

When pin 3 is pressed, overcoming the force of the spring in jumper 9, it moves and enters the hole of the screw mechanism (Fig. 3).

Setting up the MRP using the claimed device is as follows.

The device is fixed on one of the posts of the chair power frame 11 with a clamping bolt 4.

MRP 10 is connected to a power source.

By switching the toggle switch handle on the chair (up or down), power is supplied and the direction of rotation of the splined sleeve of the MRP is set.

From the splined sleeve, the torque is transmitted through a system of shafts and gears to the mechanism of the screw chair, due to which its length increases or decreases.

By sliding or moving, the screw mechanism moves the guides 2 with marks 6 and 7 applied to them through the pin 3.

The coincidence of the marks 6 with the indicators 8 is determined as one “extreme” position (Fig. 1) is set at one moment of pressing the microswitch button.

The coincidence of the marks 7 with the indicators 8 is determined as the second “extreme” position (Fig. 2) and the second time moment of pressing the microswitch button is set.

After setting up the MRP, the device is removed.

This ensures precise adjustment of the “extreme” positions of the seat in the aircraft cabin.

To date, the device for adjusting the pilot's seat height adjustment mechanism has been tested, recognized as fit for operation, and is included in the spare parts, tools, and accessories kit for the KAS, and the process for adjusting the MRP is included in the KAS technical operation manual.

Claims (1)

A device for adjusting the height adjustment mechanism of a pilot's seat, comprising a base, two guides with indicators and marks of extreme positions applied to them, a jumper, a locking pin, a clamping bolt and a bracket.