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1、 - STD-JIS M 7bZLi-ENGL 1774 m 4733b08 0537b00 T87 D UDC 614.821:622.861.2-78 JIS This standard was revised in 7, 1994 JAPANESE I NDUSTRIAL STANDARD Safety belts f o r miner This copy is an English version of Japanese Industrial Standard prepared by Japanese Standards Association, the copyright hold
2、er. Any further reproduction without permission is prohibited. Translated Japanese Standards Association 1-24, Akasaka 4, Minato-ku Tokyo 107 Japan 8 JSA, 1993 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for
3、Resale, 03/13/2007 02:37:01 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS M 7bZLi-ENGL 11794 W 4933b08 0537bOL 915 Classification Class 1A Class 1 B Class 2A Class 2B JAPANESE INDUSTRIAL STANDARD Safety belts for miners Symbol Auxiliary belt Hook(carabineer1 IA At
4、tached Hook (cara bi mer) 1B Attached Grip 2A Not attached Hook(carabineer) . 2B Not attached Grip or grip JIS H 7624-1974 1. Scope worker from a free fall while he is performing works on a height or sharp such as mining, quarrying, or civil engineering works (hereafter referred to as “safety belts“
5、). This standard refers to miners safety belts of body-bind type used to prevent a 2 . auxiliary belt, hook(carabineer), and grip as indicated in Table 1. Classification .Safety belts shall be classified into four classes by the existence of an P Fig. 1 Safety belt, class 1 A (Shape shown is an exam
6、ple) Remarks Class 1 A safety belt equipped with a grip as shown in Fig. 3 instead of its hook (or carabineer) shall be classified as class 1B safety belt. Standard referred to: JIS C 3101 JIS G 3141 JIS H 4040 JIS L 2703 Vinylon ropes JIS L 2704 Nylon ropes Rolled steel for general structure Cold r
7、olled carbon steel sheets and strip Aluminium and aluminium alloy rods, bars and wires -1- Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 02:37:01 MDTNo reproduction or networking permitte
8、d without license from IHS -,-,- I 7624-1974 NO. 1 2 3 4 5 P Names No. Names Body-bind belt 6 D-ring retainer Auxiliary belt 7 Rope Buckle 8 Hook(or carabineer) Belt-holder 9 8-ring(or three-hole ring) D-ring 10 Grip (3 Fig. 2 Safety belt, class 2A (Shape shown is an example) Remarks Class 2 A safet
9、y belt equipped with a grip as shown in Fig. 3 instead of its hook (or carabineer) shall be classified as class 2B safety belt. Fig. 3 Grip (Shape shown is an example) 3 . Names of parts in Fig. 1, 2 and 3, and Table 2 . The names of each part consisting o . f a safety belt shall be as indicated Tab
10、le 2 Names of each part of safety belt Remarks Grip shown in Fig. 3 is used when the safety belt is connected to a vertical main rope. 4. Materials 4.1 Body-bind belt synthetic fiber such as nylon, polyester, vinylon etc. (hereafter referred to as synthetic fiber”), and have no unevenness or defects
11、 in the weaving. Body-bind belt shall be made of narrow webbing woven by using yarn of -2- Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 02:37:01 MDTNo reproduction or networking permitte
12、d without license from IHS -,-,- STDmJIS t 4 7b24-ENGL IJ 7624-1974 4.2 Auxiliary belt fiber yarn or cotton yarn, and have no unevenness or defects in the weaving. Auxiliary belt shall be nade of narrow webbing woven by using synthetic 4.3 Rope Rope shall be made of synthetic fiber yarn of good qual
13、ity, and have uniformity in - its thickness and strands, and no defects throughout its full length. 4.4 Sewing thread for ring attachment Sewing thread used for attaching a D-ring and buckle ring shall be made of synthetic fiber of good quality, and have no unevenness nor defects throughout its full
14、 length. 4.5 Hook or carabineer Hook or carabineer shall be made of SS 41 specified in JIS G 3101, A2017BEsT4 specified in JIS H 4040, or other good quality material superior to them. 4.6 Grip Grip shall be made of SPCC specified in JIS G 3141, or other good quality material superior to SPCC. materi
15、al with the grip belonging to a safety belt. The grip belonging to the vertical main rope shall also be of the same 4.7 Rings , Rings such as a D-ring, 8-ring(or three-hole ring), etc. shall be made of SS 41 specified in JIS G 3101, or other good quality material superior to it. 4.8 Buckle Buckle sh
16、all be made of SPCC specified in JIS G 3141 or other good quality material superior to it. Remarks Each metal part described in 4.5 to 4.8 above shall have edges or corners rounded, and surface finished smoothly, and fully be subjected to rust prevention or anti-corrosion treatment. 5. Construction,
17、 shapes and dimensions 5.1 General Construction (1) Class 1A and 1B safety belts : A Class 1 A safety belt shall consist of a body-bind belt with an auxiliary belt, one or two D-rings, and a rope which has a hook (or carabineer) at one end, and is connected to the D-ring at the other end. It shall b
18、e so constructed as to enable a worker to put on the body-bind belt by the buckle attached to one end of the said belt, and attach the hookor carabineer) to a structure or a vertical main rope, if necessary using the 8-ringor three-hole ring) on the rope, for preventing his acci- dental fall while w
19、orking. For the convenience of the work, the hook of the safety belt may be coupled with the grip belonging to the vertical main rope. The 8-ring(or three-hole ring) may be omitted. A class 1B safety belt is so designed as to use by attaching it to a vertical main rope. -3- Copyright Japanese Standa
20、rds Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 02:37:01 MDTNo reproduction or networking permitted without license from IHS -,-,- I 7624-1974 Its construction shall be the sane with a class 1A safety belt exceptin
21、g that it, at the rope end, has a grip instead of a hook. ( 2 ) Class 2A and 2B safety belts : A class 2A safety belt shall be of the same construction with a class 1A safety belt excepting that its body-bind belt has no auxiliary belt. A class 2B safety belt shall have the same construction with a
22、class 2A safety belt excepting that it, at the rope end, is equipped with a grip instead of a hook(or carabineer). 5.2 Body-bind belt The body-bind belt shall conform to the following requirements. (1) The body-bind belt shall be made of pliable and strong narrow webbing. It shall be so constructed
23、as to cause no twists or kinks along its major axis. 50 nm in width, and more than 1100 mm in length including the buckle. without an auxiliary belt shall have thickness of more than 2 ma. It shall be more than The body-bind belt (2) One end of the body-bind belt shall be turned back after installin
24、g a buckle, and the turned or dead end shall securely be sewed on the live end of the belt with a sewing thread. The other end of the belt shall1 be protected from fraying. (3) A D-ring shall be slipped on the body-bind belt and retained in place by the D-ring retainer, or be attached to the belt by
25、 securely sewing a patch of the same material with the belt on the belt so as to hold the ring in place. The belt portion coming in contact with the D-ring shall be protected against abrasion. 5.3 Auxiliary belt the body-bind belt coupled with it, and for distributing the impact force developed in a
26、rresting the wearer in case of his fall over the possible widest area of his body. The auxiliary belt shall be more than 75 mm in width and more than 650 mm in length, and coupled with the body-bind belt. The auxiliary belt is used for reinforcing twisted or kinked portions of 5.4 Rope The rope shal
27、l conform to the following requirements. (1) - The rope to be used shall be of 3-strande2 ply or &strand(braided rope). the rope shal1,as a rule, be less than 1500 mm excluding the hook(or carabineer) or the grip. length shall be limited up to 2500 mm. The length of Even when it is necessary to use
28、a longer rope due to the.nature of the work, the (2) The hook(or carabineer) or the grip shall be installed at one end of the rope. end of the rope shall directly be connected with the D-ring, or be so constructed as to be attachable to and detacahable from the D-ring. The other -4- Copyright Japane
29、se Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 02:37:01 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS fl 7b24-ENGL L99q W q733b08 0537b05 5bO I hi 7624 -1974 (3) The ro
30、pe end where the hookor carabineer), grip, or D-ring is attached shall be turned back after installing one of them, and the turned dead end shall be protected against abrasion, and then spliced or braided into the live end of the rope more than three times. 5.5 Hook or carabineer failure or disengag
31、ement of the hooking portion. The hook or carabineer shall have a double prevention device against The carabineer shall have a deformed D-shape as illustrated in Fig.4, and its construc- tion shall be such that the line of action of force does not come to aline with its unhooking prevention device i
32、n any load condition. Fig. 4 Carabineer (shape shorn is an example) 5.6 Grip The construction of the grip shall be such that it can be attached to and detached from any position on the vertical main rope, can securely grasp a desired position on the main rope while using, and can easily be moved up
33、or down along the axis of the main rope in case o fmovement. - The grip shall also have a double checking device against its coning off the main rope, and the thickness of the mating main rope stamped at a visible place. The construction of the grip belonging to the main vertical rope shall be the s
34、ame with that of the grip belonging to the safety belt mentioned above. 5.7 Rings The D-ring, ring of the buckle, and 8-ring(or three-hole ring) shall be seamless. 6 . Performance 6.1 Strength of body-bind belt When tested by the method described in 7.1 below, the body- bind belt shall not break by
35、tensile load of less than 1500 kgf(14.71 k N ) . v Remarks: The units and values in parenthess in this standard are those used in the International System of Units(SI), and shown togather for informative references. 6.2 Strength of Rope break by tensile load of less than 1830 kgf(17.95 k N ) . When
36、tested by the method specified in 7.2 below, the rope shall not 6. 3 Strength of hook or carabineer When tested by the method prescribed in 7. 3 below, the -5- Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for
37、Resale, 03/13/2007 02:37:01 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS M 7bZLi-ENGL 1774 a 4733b 0539bOb YT7 I I 7624-1974 hook or carabineer shall not lose the function of its unhooking prevention device, nor break by tensile load of less than 1150 kgf(ll.28 k
38、 N ) . 6.4 Strength of grip break by tensile load of less than 1150 kgf(ll.28 k N ) . When tested by the method provided in 7.4 below, the grip shall not 6.5 Strength of rings ring(or three-hole ring) shall not break by tensile load of less than 1150 kgf(ll.28 k N ) . When tested by the method speci
39、fied in 7.5 below, the D-ring and 8- 6.6 Strength of D-ring attaching portion the portion where the D-ring is attached shall not break by tensile load of less than 1150 kgf (11.28 k N ) . When tested by the method described in 7.6 below, 6.7 Strength of buckle connecting portion the portion connecte
40、d by the buckle shall not break by tensile load of less than 800 kgf(7.84 k N ) . When tested by the method prescribed in 7.7 below, 6.8 Shock absorption and strength of complete safety belt The shock absorption and strength of a complete safety belt with a hook(or carabineer) or grip at its rope en
41、d shall be such tha tit will cause no breaks when tested twice repeatedly in accordance with the test method specified in 7.8 below, and the measured value of impact force at the first test will not exceed 900 kgf(8.83 k N ) . With a complete safety belt with a grip at its rope end, however, the ski
42、dding distance of the grip shall be less than 30 mm in each test. 6.9 Strength and grasping power of grip belonging to main vertical rope to a vertical main rope shall show strength meeting the requirement prescribed in 6.4 above when tested by the method described in 7.4 below. The grip belonging T
43、he power of the grip for grasping the main rope shall be such that it will not cause any breaks when tested twice repeatedly by the method specified in 7.9 below, and its skidding distance in each test will be less than 30 min. 7 . Tests 7.1 similar devices so as to leave a length of 200 mm as the p
44、art to be tested, then apply tensile load at a rate within 300 mmlmin by using a tension tester, and check for its conformity to the requirement indicated in 6.1 above. Strength test of body-bind belt Grip the whole width of a test piece with chucks or 7.2 Strength test of rope Conduct this test in
45、accordance with the method specified in 5.7 of JIS L 2704, and check for its conformity to the requirement shown in 6.2 above. -6- Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 02:37:01 M
46、DTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS M 7b24-ENGL 19q B 4733b 0537b09 333 I 7624-1974 7.3 Strength test of hook or carabineer Attach drawing metals onto the hook portion and the rope inserting eye or portion of the hook or carabineer as illustrated in Fig.5
47、, apply tensile load by using a tension tester, and check for its conformity to the provisions of 6.3 above. i + (a) Hook (shape shown is an example) (b) Carabineer (shape shown is an example) Fig. 5 Strength test of a hook or carabineer 7.4 Strength test of grip Attach the grip to a main rope with
48、the same thickness as stamped on the grip(see JIS L 21031, and hook a drawing metal onto the grip eye for installing the rope as shown in Fig. 6. conformityto the provisions of 6.4 above. Apply tensile load by using a tension tester and check for its ( a ) (shape shown is an examde) (b) (shape shown is an example) Fig. 6 Strength test of a grip -7- Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 02:37:01 MDTNo reproduction or networking permit