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1、International Standard 6440 0 Q 4 4gb INTERNATIONAL bRGANlZATlON FOR STANDARDlZATlONeMEXJ.bHAPOHAR OPAHH3Al the friction force may be generated by mechanical, hydraulic or electrical means, or by any combination of these; - an electric brake, where the force is created by elec- tromagnetic action on
2、 parts of the wheelchair that are movable in relation to each other but not in contact with each other. 3.2.3.3.1 service brake : The braking system that the driver normally uses to reduce the speed of the wheelchair or stop it completely. 3.2.3.3.2 parking brake : The braking system that is inten-
3、ded for keeping the wheelchair stationary on sloping ground whether or not the wheelchair is occupied. 3.3 Wheels 3.3.1 driving wheel : A wheel that is connected to the driv- ing system and when in contact with the underlay develops the propelling force. 3.3.2 steering wheel : A wheel that is connec
4、ted to the steering system and when in contact with the underlay governs the driving direction. 1) The control gear for propulsion, steering and braking as well as the transmission for propulsion, steering and braking are often combined in one unit. 8 Copyright International Organization for Standar
5、dization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:48:11 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8440-1985 1 El 3.3.3 castor wheel : A wheel that can pivot but is not in- tended to govern
6、the driving direction. 3.3.4 supporting wheel : A wheel that cannot pivot and which is not intended to develop propelling forces or govern the driving direction. 3.4 frame : The frame unites and supports the other parts of the wheelchair. Seat-frame-backrest etc. could form, or be combined into, one
7、 unit or consist of separate parts. 3.5 dimensions : Dimensions commonly used to define a wheelchair include seat width, seat height, seat depth, backrest height, armrest height, width between armrests, overall width, overall height, overall length, overall width folded, overall height folded. These
8、 dimensions are illustrated as follows : 3.5.1 seat width11 (at seat level) : n n I I 3.5.2 seat height11 (from floor) : 3.5.3 seat depth11 (upholstery) : 3.5.4 backrest height11 (upholstery) : 3.5.5 height of armrestsl) : 1) For the determination of seating dimensions, see IS0 7176/7. 9 Copyright I
9、nternational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:48:11 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO5440-1985(E) 3.5.6 width between armrestsl) : 3.5.7 ove
10、rall width*) : 3.5.6 overall height*) : 3.5.9 overall length21 : 3.5.10 overall width foldedz) : 3.5.11 overall height folded*) : 1) For the determination of seating dimensions, see IS0 7176/7. 2) See also IS0 717615 and IS0 7193. 10 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:48:11 MDTNo reproduction or networking permitted without license from IHS -,-,-