ASTM F2821-15(R2020) pdf free download

ASTM F2821-15(R2020) pdf free download.Standard Test Methods for Basket Type Rescue Litters
1. Scope
1.1 These test methods enable the user to determine if a rescue litter meets the requirement for strength depending upon particular applications and methods of use. 1.2 The test methods described in this standard are designed to test several parameters under “manner of use” conditions. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for informa- tion only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Terminology
2.1 Definitions ofTerms Specific to This Standard: 2.1.1 basket type litter, n—a conveyance for the sick or injured usually consisting of a tubular metal frame enclosing a molded plastic or wire shell. Also known as a basket stretcher. 2.1.2 litter bridle, n—a manufactured or improvised system that attaches the litter to the raising or lowering system. 2.1.3 horizontal lift, n—refers to the patient being in a horizontal position with the head and feet at approximately the same level. In this configuration the litter bridle attaches to the litter at four points. 2.1.4 anchor plate, n—a device installed inside the litter that is used to attach the litter to the bed of the test apparatus. It must be of sufficient size and stiffness to distribute the forces on the litter shell or frame, thereby allowing the test of the attachment points 2.1.5 vertical lift, n—refers to the patient being in a head up and feet down position. In this configuration the litter bridle attaches to the litter at the head end only.
3. Summary of Test Method
3.1 Horizontal test method is designed to test the litter attachment points and the resistance of the litter to folding or curling. 3.2 Vertical test method is designed to test the structural strength of the head end of the litter or the manufacturer’s designated bridle attachment points or both, and for a two- piece litter, to also test the connection between the two sections of the litter. 3.3 These tests are destructive in nature and will require a new litter for each test.
5. Apparatus
5.1 General—Use calibrated electronic load measuring de- vices. The testing equipment shall have sufficient capacity to prevent yielding of its components under the anticipated ultimate load, and shall have sufficient stiffness to ensure that the applied tension loads remain parallel to the axis of the anchors. 5.2 Anchor Plate—Shall be installed in the litter in such a way that the force distributes equally and does not concentrate on a single element. The purpose is to test the attachment points of the litter bridle, the connection points that hold the halves of two-piece litter together, and the litter’s ability to resist folding or bending both longitudinally and laterally. The anchor plate size must be kept to a minimum so that it does not provide any increased resistance to the litter bending during a test. In cases where the litter does not have a frame, the plate shall span any ribs or other structural elements within the shell in order that the forces are distributed over a wide enough area that unintentional damage does not occur.