1、 - A-A-59170 D 9999974 0177192 570 D WCH-POUND A-A-59170 27 March 1998 SUPERSEDING 6 October 1983 MIL-B-2424D COMMERCIAL ITEM DESCRIPTION BLOCK AND TACKLE WITH LOm-LOCKING DEVICE The General Services Administration has authorized the use of this comercial item description for ail federal agencies. 1
2、. SCOPE. This commercial item description (CID) covers a double-sheaved, single-reeved, nylon rope block and tackle with a locking device commonly used to lift and move objects. The block and tackle is intended for use in rigging, construction, and other military operations to gain a mechanical adva
3、ntage when hoisting, pulling, or moving heavy objects and to hold loads in place through use of a safety locking device. 2. CLASSIFICATION. Block and tackle sets with load-locking devices shall be the following sizes. Size is determined by the working load limit (WLL)of the block and tackle assembly
4、. The size to be furnished shall be as spccified (see 7.2). Size 1 - 480-pound WLL Size 2 - 800-pound WL Size 3 - 2240-pound WLL Size 4 - 4000-pound WLL Size 5 - 6160-pound WLL Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any data which may improve this docum
5、ent should be sent to: Defense Supply Center Richmond, Am: DSCR-VBD, 8000 Jefferson Davis Highway, Richmond, VA 23297-5610. AMSC N/A FSC 3940 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without
6、 license from IHS-,-,-A-A-591 70 Size (blocknumber) 1 2 3 4 5 3. SALIENT CHARACTERZSTICS Sheave Rope Fixed block WLL, Moving block WLL, Maximum load, inches inches 1 112 114 600 480 480 2 114 1 12 1 O00 800 800 3 1/2 3/4 2800 2240 2240 4 ID 1 5000 4000 4000 6 114 1 114 7700 6160 6160 diameter, diame
7、ter, pounds pounds Po 3.1 General reauirements. Tli: block and tackle shall consist of two double-sheaved blocks, one fured and one moveable, reeved with a single nylon rope with one end of the rope spliced to the becket of the fixed block. The block and tackle assembly and components shall meet the
8、 requirements shown in figure I and section 3.2 herein. All parts subject to wear, breakage, or distortion shall be accessible for inspection, adjustment, replacement, and repair. FIGURE 1. Block and tackle reauirements. 3.2 Commnents. The block and tackle shall include, as a minimum, the foliowing
9、components: 3.2.1 Blocks. The fixed and movable blocks shail be fabricated hm compatible metallic materials that are inherently cornsion and deterioration resistant or treated to provide protection against corrosion and deterioration. Sheave bearings shall be oil-self-lubricating bnix conforming to
10、ASTM B 438. ifrequired, special materials, material finish, or surface treabnent of components or subcomponents shall be as specieci (see 7.2(c). The block and shelves shall be designed to prevent jamming of the rope and shail have smooth edges and surf8ces to pvmt damage to the rope. Each block sha
11、ll be equipped with a loose side hook. The fixed block shall be equipped with a load-ioclcing device and a becket. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-5 91 7 O 9999974 0177194 343 A-A-59170 3.2.2 Hook. The hoist style hooks shall b
12、e marked and constructed in accordance with ASME B30.10. Unless otherwise specified (see 7.2 (d), size and throat clearance shail be determined by standard commercial practice to meet load and size requirements for the size of block and tackle specified. Unless 0th :mise specified (see 7.2 (e), hook
13、s shall be equipped with a with safety latch. 3.2.3 RoDe. Unless otherwise specific d (see 7.2 (o), the rope shall be 3-strand nylon rope conforming to Co-dage Institute (CI) 1 ublication CI-1303. The rope shail contain no cuts, kinks, soft spots, chafed or damaged sections, or broken or loose proje
14、cting ends in the rope or strands. The rope diameter shall fit the block as specified in figure 1. One end shall have an eye splice made in accordance with CI publication CIB-7 around the becket of the fixed block. The free end shall be cut off squarely and securely whipped or taped and heat sealed.
15、 The rope length shall be as specified (see 7.2 (g). 3.3 Safetv and health reauirements. The manufacturer shall ensure that the block and tackle and all components used shall be in complianc,: with Occupational Safety and Health Administration (OSHA) 29 CFR PART 1926.251. If a conflict arises betwee
16、n this document and OSHA standards, the OSHA standards shall apply. 3.4 Identification marking. The blocks shail be permanently and legibly marked with the manufacturers name or trademark and the niaximum load the block and tackle assembly is designed to lift. 4. REGULATORY REQUIREMENTS 4.1 Environm
17、ental Drotection. The item shall meet all applicable Environmental Protection Agency (EPA) restrictions in effect on the date of the contract. These regulations apply to the emission of materials hazardous to the environment or the users health and shail be adhered to during the manufacturing, servi
18、ce, transportation, storage, and operatioduse of the item. 5. QUALITY ASSURANCE 5.1 Product conformance. The produ AS shall meet the salient characteristics of this commercial item description; conform to the manu cturers own drawings, specifications, standards, and quality assurance practices; and
19、be the same product offered for sale in the commercial market. The Government reseives the right to require proof of such conformance. 5.2 Inspection. The block and tackle shall bc inspected to determine compliance with all requirements specified in this CID. 5.3 Testing. Unless otherwise specificd
20、(see 7.2 fi), the block and tackle shall be tested in accordance with sections 5.3.1 through 5.3.3. 5.3.1 Oterational test., The block and tackle set with load locking device shall be tested by 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59
21、 170 8 hoisting a load at 125 percent of the maximum load specified in figure 1 in accordance with OSHA 29 CFFt PART 1926.25 1. At the conclusion of this test, the block and tackle shall be visually examined for evidence of damage. 5.3.2 Blocks. The individual blocks shall show no evidence of deform
22、ation, distortion, cracks, or permanent set when subjected to a proof load twice the WLL specified in ligure 1. The manufacturer shall certiQ that the blocks shall withstand five times their WLL without failure. 5.3.3 Locking mechanism. The locking mechanism shall grip the rope immc:diaiely upon rem
23、oval of the hoisting Strain. The locking mechanism shall cause minimum rope wear and shall securely lock the rope under 125 percent of the maximum load specified in figure 1. The locking mechanism shall have a release feature which allows release of the load by the operator. 5.4 Acetance. Prelimimy
24、and final acceptance tests shall be conducted at the manufacturers site. Failure of the block and tackle to meet the test requirements of section 5.3 shall be cause for rejection. The manufacturer shall provide certification that each block meets the proof load and the block and tackle assembly and
25、locking mechanism meets the 125 percent maximum load test 6. PACKAGING. Preservation, packing, and marking shall be as specified (7.2 (i). 7. NOTES 7.1 Sources of documents. 7.1.1 Govemeiit documents. Copies of Federal documents may be obtained from the Superintendent o 1 Documents, U.S. Government
26、Printing Ofice, Washington, DC 20402. 7.1.2 Industrv standards. Copies of industry standards referenced in this CID may be obtained hm the following addresses: Occupational Safety and Health Administration (OSHA) OSHA 29 CFR PART 1926.25 1 Rigging equipment for material handling Applications for cop
27、ies should be sent to the U.S. Department of Labor, 200 Constitution Avenue NW, Room 423, Washington, DC 20210. Cordage Institute (CI) CI-1303 NylonFiber Rope 3-Strand and 8-Strand Constructions CIB-7 Splicing Instructions Applications for copies should be sent to the Cordage Institute, 350 Lincoln
28、Street, Hingham, MA 02043. ASTM (Formerly the American Society of Testing and Materials) 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-591 70 I ASTM B 438 Standard Specification for Sintered Bronze Bearings (Oil-impregnated) Applications for
29、copies should be sent to the ASTM, Inc. 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. 7.2 Orderiiia data. Acquisition documents must specie the following: a. Title, number, and date of this document, b. Size of block and tackle required (see 2). c. Block materials and finish, if different
30、 (see 3.2.1). d. Size and throat clearance, if differcnt (see 3.2.2). e. Safety latch, if different (see 3.2.2). f. Type of rope, if different (see 3.2.3). g. Lcngth of rope required (see 3.2.3). h. Tcsting, if different (see 5.3). i. Packaging requirements (see 6). 7.3 Ert idmtification number (PIN
31、) . The following part identification numbering procedure is for government purposes and does not constitute a requirement for the contractor. Size: See figwe 1 for size. CID number I MILITARY INTERESTS: Custodians Air Force - 99 Army - CR4 PREPARING ACTIVITY: DLA-GS (Project 3940-0007) Reviewers Air Force - 84 Navy - SH, YD1 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
