ARMY MIL-F-20412-1951 FUSE SAFETY (BICKFORD TYPE)《(比克福特型)安全引信》.pdf

1、Army 50-69-lA 23 February 1934 MI.,-F-20412- 4 December 1951 MILITARY SPECIFICATION FUSE, SAFETY (Bickford Type) This specification was approved by the Departmerts of the Army, the Navy, and the Air Force for use of procurement services of the respective Departments, ad supersedes the following spec

2、ification: This specification consists of this cover sheet and Specification 50- 69- U, dated 23 February 1934, attached hereto, without modification. When a request for this specification is received by a supplying activity it will be necessary to attach this cover sheet to the pertinent specificat

3、ion before issue. Copies of specifications required by contractors in connection with specific procurement functions should be obtained from the procurirg agency or as direc- ted by the contracting officer. Custodian: Army- O Provided by IHSNot for ResaleNo reproduction or networking permitted witho

4、ut license from IHS-,-,-NO. 50-69-1A February 23, 1934 Supers edirg June 16, 1930 NO. 50-69-1 U. S. ARMY SPECIFICATION FUSE, SAFETY .(Bickford Type) I. GENERAL SPECIFICATIONS. 1. The following United States Army Specifications and the applicable drawing, if any, of the issue in effect on the date of

5、 invitation for bids, shall form a part of this specification: 96-111-5, United States Army Specification for Matchhead. 100-2, United States Army Standard Specifications for Marking Shipments. II TYPES. 1. This specification cozrers 3 types. Type I. Burning time, 5.25 seconds per inch, Type II. Bur

6、ning time, 4.25 seconds per inch, Type II. Burning time, 2.75 seconds per inch. III. MATERIAL AND WORKMANSHIP, 1. The contractor shall furnish all materials required for the production, packing, marking, and shipping of the material contracted for, of the kind and type noted on the drawirgs and in d

7、etail specifications, except materials speci- fically excepted by the terms of the contract. IV. GENERAL REQUIREMENTS. 1. Construction. - The fuse shall consist of a thin train of powder tightly compressed in inner and outer wrappings of jute thread, cotton thread, or tape, with a suitable waterproo

8、fing material between them. The waterproofing material shall be of a grade that will be least affected by climatic conditions. The body of the fuse shall be uniform in cross-section and flexible throughout its entire length. 2. Diameter. - The diameter of the fuse shall be as specified in the contra

9、ct or as indicated on the applicable drawing. 3. Length. -The length of the fuse shall be as specified in the contract or as indicated on the applicable drawing, but in no case more than 50 lineal feet in one length. 4. Ends. - The ends of each piece of fuse shall be cut perpendicular to the axis of

10、 the fuse, without fraying or other irregularities. 5. Starting paste- When so specified in the contract, one end of each piece shall be covered with matchhead, specification 96-111-5, or with the starting paste (priming cap) indicated on the applicable drawing. In case the contractor desires to use

11、 a matchhead, or starting paste, other than the one specified, he shall, prior to the use thereof, receive tipproval of the United States. and shall be as indicated on the applicable (priming -2p) shall be firmly attached Provided by IHSNot for ResaleNo reproduction or networking permitted without l

12、icense from IHS-,-,-*. 50- 69- 1A -. 6, Flame intensik. - The flame intensity shall be such that the fuse will pass the test described in section VI, paragraph M., V. DETAIL REQUIREMENTS. 1. Burning time.- The burning time of. the fuse shall be as shown in Table I: TABLE I Time of burning, seconds p

13、er inch Minimum Maximum Type 5. O 5. 5 4. o 4.5 2.5 3. o 1 - - - II- - - - - - - - - - m - - - - - - - - - - - - - - - - - - - TABLE II Type Color of center thread I- Green thread visible in unprimed end. III- Red thread visible in unprimed end. VI METHODS OF INSPECTION, TESTS, ECT. wise specified i

14、n the contract. II- Yellow thread visible in unprimed end. 1. inspection, - Inspection shall be at the point of delivery unless other- 2. Size of lots. - a. When ordered in short pieces, 20,000 maximum. b. When ordered in lineal feet, 6,000 maximum. c. A smaller quantity of either piecesor lineal fe

15、et may constitute a lot at the discretion of the Government inspector, 3. Sampling. -a. When ordered in pieces, the Government inspector shall select 20 pieces of fuse from each lot for test. b. When ordered in pieces, the contractor shall furnish from each lot of fuse for the waterproof test, 10 sa

16、mples 12 inches long. These samples shall be primed on one end. c. When ordered in lineal feet, the Government inspector shall. select 10 reels or coils from each lot and cut three 12-inch pieces of fuse from each for test. When a lot contains less than 10 reels or coils, the Government inspector sh

17、all cut three 12-inch pieces of fuse from each for test. Dip one end of the sam- ple fuse pieces in match-head paste, United States Army Specification 96-111-15 and allow to dry. d. All specimens and samples shall be properly marked for identification, e. The contractor shall always allow, without c

18、ost to the United States, sufficient additional material to furnish the test specimens or samples required, unless Othe mise provided in the contract, Any material required by the con- tractor for his own tests at the various stages of manufacture shall be in addition Provided by IHSNot for ResaleNo

19、 reproduction or networking permitted without license from IHS-,-,-flIL-F-20LtL2 13 777770b 0300860 T 50-69-LA to that required by the United States for the test of acceptance, and in no case, unless by special authorization of the inspector, shall the contractor use for his own tests any of the mat

20、erial required by the United States. bility of the material represented, necessitated by the defects in the original specimens, or other like causes, shall be furnished at the expense of the con- tractor, and he shall bear all the expense of such additional tests. 4. Testing. - a. Construction, - Th

21、e Government inspector shall make sufficient examination of the sample fuse pieces for defects in construction and to determine if the other requirements of the specification or applicable drawing are complied with. Reject the lot if defects in construction are found, Also reject the lot if any of t

22、he other requirements of the specification or applicable drawing are not met, b. Waterproofness. - Tie the two ends of each of 10 of the 12-inch sample fuse pieces so that each piece forms a loop. Then suspend each loop in a vessel of water to within 2 inches of the ends for 5 minutes. Remove from t

23、he water, unfasten ends, remove excess water, and ignite separately in a V-shaped trough by means of a red-hot iron or similar method applied to the primed ends of the fuze. Determine time of burning of each fuse piece by the use of a stop watch or equivalent method which is capable of recording cor

24、rectly within one tenth of a second, Reject the lot, subject to retest, if any fuse piece fails to burn comple- tely at the burning rate prescribed in Table I. Repeat the test once, using double the number of samples, in case a retest is requested by the contractor, if not more than two fuse pieces

25、fail to meet the requirements of Table I provided no piece burns less than O. 5 second per inch below the compuw burning time, using the minimum time of bzrning for the type being tested. Reject the lot if, in the retest, any.fuse piece fails to burn completely at the burning rate pre- scribed in Ta

26、ble I. c. Burning time, - Ignite 10 of the sample fuse pieces separately in a V-shaped trough by means of a red-hot iron, or similar method, applied to the primed end of the fuse, Determine time of burning of each fuse piece by the use of a stop watch or equivalent method which is capable of recordi

27、ng correctly within one tenth of a second. Reject the lot, subject to retest, if the rate of burn- ing of any piece fails to come within the limits specified in Table I. Repeat the test once, using double the number of samples, in case a retest is requested by the contractor , if not more than two s

28、ample fuse pieces fail to meet the require- ments of Table I, provided no piece burns less than O. 5 second per inch below the computed burning time, using the minimum time of burning for the type being tested. Reject the lot if, in the retest, the rate of burning of any fuse piece fails to come wit

29、hin the- limits specified in Table I. d. Flame intensity. - Form a train with 10 of the sample fuse pieces. Place them, with primed ends pointing the same direction, 1/2 inch apart, in a V-shaped trough. Ignite the primed end of the first piece. Reject the lot of fuse, subject to retest, if the flam

30、e from any fuse piece fails to ignite the adjacent fuse piece, or if an instantaneous or near-instantaneous action be obtained from any single fuse. Repeat the test once, using double the number of samples, in f. Any additional specimens or samples required to establish the accepta- 4 Provided by IH

31、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5 O- 69- 1A case a retest is requested by the contractor. Reject the lot if, in the retest, the flame from any fuse piece fails to ignite the adjacent fuse piece or if an instan- taneous or near-instantaneous action

32、be obtained from any single fuse. Note. - A misdirection of the flame from one fuse piece to the primed end of the next fuse will not be cause for rejection. The fuse pieces already burned through to the first fuse piece remaining uriignited, may be replaced by uses selected from the srne lot amCa t

33、he test carried out as originally intended. VEL PACKING AND MARKING. 1, ga2ckagin$. - a. Pieces: - Pack 1, O00 pieces of fuse in a pasteboard box. The pasteboard box shall be lined with a wa,terproofed paper of suitable weight and thiclmess;, The pa,steTQoa,rd box shall be stamped with the grade of

34、hse packed therein, arad saia% be wrapped En waterproofed paper. bo Weds OF coils. - When ordered in lineal eet, the fuse shall be woimd on reels or in coils O 50 feet each. 2, kla,cking, - a. Pieces;, - Pack 20 pasteboard boxes in suitable metal liner. Hermetically sea% the liner and provid with th

35、e usud tem strtp and tear- strip handle to facilibte iipa,ckiybg;. “he metal liners shall be pa,cBed in WQOII portation, at the correct radte, to the point sf delivery. b. Reek OF coils, - Unless othemise specified, the reels OP coils of fuse shall be delivered in waterproofed containers so construc

36、ted as to insure accep- tance by common or other carrier, for safe transportation, at the correct rate, to the point of delivery. c. Place a data card 5 by 8 inches, made of commercial mahila tag board (approximately 200 punds ream weight) and properly filled out according to the form below, in each

37、 packing box liner and container. Two of these cards for each lot shall accompany each shipping ticket, and six of these cards for each lot shall be furnished the inspector. SX! 3 = 3. Marking. - a. Packages shall be labeled showing the number of pieces of fuse, grade, limits of time of burning, and

38、 lot number. b. Reels and coils shall be labeled showing the grade, limits of time of burning and lot number. c. Shipping boxes and containers shall be marked in accordance with Specification No, 100-2, and Pa addition shall be stamped with the lot number. VPII NOTES. Projectbr Fuzes, Hand and Rifle

39、 Grena.de Fuzes. all procuring agencies of the Army. 1. The fuse specified herein is for use iia the manufacture of Livens 2. The use of this specification, wheiaever applicable, is maidatory on NOTE. -8- Copies of this specification may be obtained upon application to the Office, Chief of Ordnance, Washington, D. C. a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-