DLA A-A-52049-1992 TRIPOD SURVEYING FOR RANGE POLE《测量距离杆位三脚架》.pdf

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1、A-A-52049 66 m 9999974 00634I7 I m A-A-52 049 Jan- 16, 1992 Ihe General Services Mmhistm tion has authorized the use of this -i distributim is unlimited. Licensed by Information Handling ServicesA-A-52049 66 997797Ll 00b3Lll1 3 = A-A-52049 (d) Swivel. Each leg mly includec a 1 1/8-indi diameter alum

2、inum alloy swivel weed into the top of the leg. Ihe swivel pmvides a pivot contact point to attach the legs to the tripod head. assmblv 3. Ws leg is drilled to provide attachments for the strap binding assembly, the bracket extencion assembly storage, an the level. (2) (a) m. Ihe third tripod leg as

3、senbly is constnicted of aluminum alloy tubing 36 inches in length (1s) x l.OO-inch Outcide diameter (OD) ard with a wall thickness of 0.065-inch. (b) Strap bindins assembly. Ihe 15.5-h& long strap bindirig accembly, use to bind the three legs together when the tripod is not in use, consists of webb

4、ing, buckle, and a clip. (c) Swivel. The third leg assembly includes a 1.125-indi dime- alimllnimi alloy swivel welded into the tap of the leg. Ihe swivel pravies a pivot contact point to attach the leg to the tripod head. (d) Socket. nie leg shall be constructe with a 2-indi diame- cast aluminum al

5、loy coclcet which tapert dm to 0.375-% diameter to hold the leg point. hardened to Rockwell C40-45 to pwide the tripod contact point with the ground. nie point is pinned into the socket. (e) mint. Ihe socket shall be fitted with a point of CRES (f) Rivet and washer. A rivet and washer are pmvide to

6、secure the binding strap to the leg. (1) Rivet. nie rivet is a solid-universal head, aluminum alloy type. (2) Washer. The washer is a flat-meta, round, general psirpose type, made froan anodized aluminum allay. b. Bracket. extension assenhly. A bracket extension assahly is pravided to sec=ure the ra

7、nge pole in a vertical position beside the tripod. (1) Ekacket. extension. Ihe extension bracket is fabricated fran a section of aluminum alloy. extension bracket 9.62 Mes. A 1.56-indi diamter hole at orie end of the bracht holds the range pole. A 6-hch elongated slot all- the range pole to be exten

8、ded outwar fnan the tripod. % wer ali length of the 2 1 Licensed by Information Handling ServicesA-A-52049 66 9999974 0063LiL9 5 A-A-52049 (2) Groamnet. A groamnet shall be place inside the 1.56-indi diameter hole in the extension bracket, to protect the rarige pole. c. Screw lockina acsembly. A scr

9、ew locking assembly shall be provided to seare the extension bracket to the tripod head. (1) -. lockinq . nie extension bracket locking ccrew chal1 be nie autside cast aluminum alloy or aluminum alloy wrought. tap portion of the locking screw shall have a coarse stmight knurl. The outside battaan po

10、rtion shall have 0.625-11 UNC-2A threadc. diameter on each side to accaarpiiodate the bar. nie tap portion shall have one hole O. 1586-inch (2) m. A bar, conshting of a spring steel wh, shall be inserted into the center of the tap portion of the screw in the holes pmide. maintains a spring action wi

11、thin the holes an pmides an anchor for the link. nie bar, bent U shape in the center (3) Link. Alinkshallbeinserted on the bar in the tap center of the screw. screw assembly when nut in use. nie link pmides captive chaining for the locking d. Bracket. mount-. nie mounting bracket shall be aluminum a

12、lloy casting with a holes shall be pmided for bolting the leg assahlies to the mthg bracket. hole for a c?Es helical coil insert. Ihree Note: Ihree screws, nuts, washers, and safety wh are required to attach the leg assenblies to the mounting bracket. e. Wel. circular. rod. A ckular rod level corisi

13、sthg of a circular level vial mounted on a right angle support is provided and secured to the leg assexbly with the extension bracket. nie level vial mounting shall be adjustable. f. Screw. Ahexagonaheadcapccrew (finished hexagon bolt), shank drilled for cotter pin, is pmided to cecure the level and

14、 the extension bracket to the leg assembly. g. Stra clm. A strap clamp is pmided to cecure the level and the extension bracket to the leg assably. 3. 4. identification. nie tripod shall be identified with the manufacturers name or trade mark. Treatment and minting. nke tripod shall be cleaned, treat

15、ed, and painted. 3 t Licensed by Information Handling ServicesA-A-52049 bb = 9999974 O063420 II A-A-52 O49 5. WOrlaMnshi p. Ali parts, cmponents, an assemblies of the tripod shal be clean an free fm sand, dirt, fins, pits, sprues, scalec, flux and other hamiful extraneaus material. Certification of U) -0 “I 6 1 1 I I I I I I 1 I 1 I I l I l l l , 1 I I l I I I I l 1 1 1 I l l I I I I I I I I 1 1 l I I l 1 I I I I, Licensed by Information Handling Services