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13818 RULES AND REGULATIONS <b) Framework: (l) Minimum dimensions of material for the framework of all guards except as noted in subparagraph (S) of this paragraph shall be angle iron 1 inch x 1 inch x % inch, metal pipe of % inch in side diameter or metal construction of equivalent strength. <21 All guards shall be rigidly braced every 3 feet or fractional part of tlielr height to some fixed part of machinery or building structure. Where guard is exposed to contact with moving equip ment additional strength is necessary. <3) The framework for all guards belt and follow tire line of the pulley to the celling or be carried to the nearest wall, thus enclosing the belt effectively. Where belts are so located as to make it impracticable to carry the guard to wall or ceiling, construction of the guard shall be such as to enclose completely the top and bottom runs of belt and the face of pulleys. See section 50-204.1Q3 (b) and <c). (b) The guard and all its supporting members shall to securely fastened to wall or ceiling by gimlet-point lag screws or through bolts. In case of masonry construction, expansion bolts shall be of the pulleys which the guard encloses thus forming a trough. These side filler members shall be reinforced on the edges with 1% Inch x Vt inch flat steel, riveted to the filling material at not greater than ft Inch centers; the reinforcing strip shall be fastened or bolted to all guard sup porting members with at least one % inch rivet or bolt at each Intersection, and the ends shall be seem ed to the cell ing with lag screws or bolts. The filling materials shall be fastened to the framewoi'k of the guard and the filler supports by %o Inch rivets spaced on 4 Inch cen ters. The width of the multiple drive fastened to floor or working platform used. shall be determined by measuring the and without other support or bracing <c> Suitable reinforcement shall to distance from the outside of the first to shall consist of Inch xlK Inch x Vfe provided for the celling rafters or over the outside of the last rope or chain in inch angle iron, metal pipe or lVi inch head floor beams, where such is neces the group accommodated by the pulley. Inside diameter or metal construction of equivalent strength. All rectangular' sary, to sustain safely the weight and stress likely to to imposed by the guard. 50-204,185 Guard rails and (oe boards. guards shall have at least 4 upright The interior surface of all guards, by (a) Guard rails shall be 42 Inches in frame members each of which shall to which is meant the surface of the guard height, with mid-rail between top rail carried to the floor and to securely with which a belt will eome In contact, and floor. fastened thereto. shall be smooth and free from all pro (b) Posts shall be not more than 8 (4) Cylindrical guards shall have at jections of any character, except where feet apart; they are to to permanent and least 3 supporting members carried to construction demands it; protruding substantial, smooth, and free from pro floor. shallow round-head rivets may be used. truding nails, bolts, and splinters. If <5) Guards thirty inches or less in Overhead belt guards shall be at least made of pipe, the post shall be iy inches height and with a total surface not In one-quarter wider than the belt which Inside diameter, or larger. If made of excess of teu square feet may have a they protect, except that this clearance metal shapes or bars, their section shall framework of % Inch solid rod, % inch need not in any case exceed 0 Inches on be equal in strength to that of 1 % by l J4 x % inoh x Vi inch angle or metal con each side. Overhead rope drive and by ylfl inch angle iron. If made of wood, struction of equivalent strength. The block and roller-chain-drive guards shall the posts shall be 2 x 4 inches or larger. Ailing material shall correspond to the to not less than 6 inches wider than the The upper rail shall be 2 x 4 Inc? ns or requirements of the table contained in drive on each side. two 1x4 strips, one at the top anu one paragraph (a) of this section. (c) The speciAcations given In para graphs <a> and <b) of this section are the minimum requirements; where guards are exposed to unusual wear, deteriora tion or Impact, heavier material and construction shall be used to protect amply against the specific hazards involved. In' overhead silent chain-drive guards where the chain is held from lateral displacement on the sprockets, the side clearances required on drives of 20 inch centers or under shall not to less than Vi inoh from the nearest moving chain part and on drives of over 20 inch centers a minimum of V& inch from the nearest moving chain part, 50-204.182 Wood guard*. (d) The table following section BO- (a) Wood guards may to used in the woodworking and chemical industries, in industries where the presence of fumes 204. 184 gives sizes of materials to be used and general construction of guards for belts 10 inches or more in width. or where manufacturing conditions would cause the rapid deterioration of No material for overhead belt guards should be smaller than that specified in at the side of posts. Hie mid-rail shall be 1 x 4 inches or more. The rails (metal shapes, metal bars, or wood), shall to on that side of the posts which gives the best protection and support. Where panels are fitted with expanded metal or wire mesh as noted In table, section 204.181 the middle rails may be omitted. Where guard is exposed to contact with moving equipment, addi tional strength may to necessary. (c) Toe boards shall be 4 inches or, more In height, of wood, metal, or of metal grill not exceeding i Inch mesh. Miscellaneous Machine Guarding metal guards; also In construction work and In locations outdoors where extreme cold or extreme heat makes metal guards and railings undesirable. In all other industries, wood guards will not be allowed. this tabic for belts 10 to 14 Inches wide, even if the belt is less than 10 inches in width. However, No. 20 genre sheet metal may be used as a filler on guards for belts less than 10 Inches wide. Ex panded metal, because of the sharp 50-204.190 Lathes and automatic screw machines. (a) Chucks and face plates shall be free from projections, and dogs, if used, shall be of the safety type only--circular (b) Material and construction. (1) Wood shall be sound, tough, and free from any loose knots. <2) Guards shall to made of planed lumber not less than one inch rough edges, shall not be used as a filler in hori zontal belt guards. re) For clearance between guards and belts, ropes or chains of various center to center dimensions between the shafts, in shape with no projections beyond the periphery. (b) Chip guards to catch flying chips, particularly in the case of the high speeds used In the softer metals, shall be board measure and edges and corners see bottom of table following section provided. rounded off. 50-204.184. <c) Rotating stock in turret lathes and <3> Wood guards shall be securely fastened together with wood screws, hard wood dowel pins, bolts, or rivets. 50-204.18-1 Cnurd* for liorixnntul owrlicitil rope and chain drive*. automatic screw machines shall be com pletely enclosed in pipe long enough to contain the longest stock used. 14) While no definite dimensions are Overhead-rope and chain-drive guard (d) Suitable shields and oil catchers given under this heading for framework construction shall conform to section 60- shall be provided to prevent slipperiness or filler materials, wood guards shall be 204.183 for overhead-belt guard con from oil thrown from the automatic equal in strength and rigidity to metal struction of similar width, except that screw machines. guards specified In section 50204.181 fa) (b) (c>. 15) For construction of standard wood railing, see section 50-204.185, the filler materials shall be of the solid type as Shown in table following section 60-204.181 (a) unless the fire hazard de mands the use of open construction. A 50-204.191 Drill i.icsm*. (a) All projections on the rotating spindle and as much as possible of the 50--204.183 Guards for horizontal overhead belts, side guard member of the same solid fill ing material shall be carried up in a vertical position 2 inches above the level spindle itself should be guarded. (b) Spindle drive belts, when in range of the operator's head or tody, shall be la) Guards for horizontal overhead of the lower run of the rope or chain guarded to protect the operator from belts shall run the entire length of the drive and 2 inches within the periphery both contact and breakage.