Electric Patient Bed

A hospital bed is a bed specially designed for hospitalized patients or others in need of some form of health care. These beds have special features both for the comfort and well-being of the patient and for the convenience of health care workers. Common features include adjustable height for the entire bed, the head, and the feet, adjustable side rails, and electronic buttons to operate both the bed and other nearby electronic devices.

Hospital beds and other similar types of beds are used not only in hospitals, but in other health care facilities and settings, such as nursing homes, assisted living facilities, outpatient clinics, and in

home health care.

                                               

Electric hospital bed

Size: Twin-size hospital bed measurements: (91.4cm)W x (203.19cm)L (outside overall end-to-end length: (220.97cm))Lift Range: Head - 60˚, Knee - 30˚.Maximum patient weight: 158.7kg .

Bed HeightCasters in Standard

Position: Min. 33cm, Max. 59.68cm (at deck level

Electric Patient Bed

Mechanical Design Electrical Control

-Bed measurements-Force analysis

-Motors-Ac / Dc -H-bridge -(Driver of Motors )

- Latch -Microcontroller

Safty

-Safty Measurements -Electrical safty & Isolation -F D A statement

F

R R

F1 F2R

1R4

R2 R3

X = ـــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ

W1X1 + W2X2 + WnXn

W1 + W2 + Wn

Motor TypesAC MotorsAdvantages Simple Design Low Cost Reliable Operation Easily Found Replacements Variety of Mounting Styles Many Diff erent Environmental

Enclosures

Disadvantages · Expensive speed control ·

Inability to operate at low speeds

· Poor positioning control

DC MotorsAdvantages Easy to understand design Easy to control speed Easy to control torque Simple, cheap drive design

Disadvantages Expensive to produce Can't reliably control at lowest

speeds Physically larger High maintenance Dust

DC motorServo motor A servomechanism, or servo is an

automatic device that uses error-sensing feedback to correct the performance of a mechanism. The term correctly applies only to systems where the feedback or error-correction signals help control mechanical position or other parameters. For example, an automotive power window control is not a servomechanism, as there is no automatic feedback which controls position—the operator does this by observation. By contrast the car's cruise control uses closed loop feedback, which classifies it as a servomechanism.

Stepper motors

Stepper motors were and still are often used in computer printers, optical scanners, and digital photocopiers to move the optical scanning element, the print head carriage (of dot matrix and inkjet printers), and the platen. Likewise, many computer plotters (which since the early 1990s have been replaced with large-format inkjet and laser printers)