ASME B107.18:2004 pdf download

ASME B107.18:2004 pdf download PLIERS:WIRE TWISTER
Wre twister pliers shall incorporate a device, which,when actuated, wili cause the plers to rotate abaut itslongitudinal axis.The halves of the phers shall be perna-nenly joined with a through fastener that shali act asthe pivot or fulcrum point of the pliers. A locking device,when engaged, shali hold the handles in a closed posi-tion in such a manner as to cause the jaws to firmly andsecurely grip and hold stuands of lock wire.
wire clearance opeirg shall be provided betweenthe two jaws and located between the gripping andcutting areas of the jaws. This opening shall be of a sizeand design which will perut the user to swiftly andeasily deflect double strands of wire out of the sides ofte jaws and away fron the cutting edges when per-forming continuous (multiple) lock wiring operatians.The nose design shali be as shown in Figs 1 through 4and bled with the radius of the sides of the pliers inaccordance with good corinerciai practice. The maxi-mun perinissible opening at the top of the jaws, whenclosed, shall be as shown in Figs. 1 and 2
5.2 Materal
he rraterials used in the marufacture of the pliersshall be such as to produce pliers conforming to therequirements specified herein.
5.3 Finish
Surfaces shall have a nust preventive treatment andbe escentially free from pits, nodules, burrs, cracks, andother conditions that would adversely affect the per-formance or safety of the tool. When provided, coatingsshall be adherentsmooth,cortinuous,and frce fronany conditions that would irterfere with their protectivevalue , safety, and function.
5.4 Marking
Plers shail be marked in a plain and peinuanent man-ner with the manufacturer ‘s name or with a trademarkof such konown character that the source of manufactureand country of origin shall be veadily determined. Mark-ing shall be as periranert as the norenal life expectancyof the pliers to whichit is applied (providing the markedsurface has not been subjected to a freting or abradingaction) and be capable of withstanding the clearing procedunes rormally experierced during its intended use.5.5 Handles
Handles shall have a hardness of 36 HRC to 50 HRC.shaill be shaped to provide a comfortable handgrip. andshall be free fron rough edges and sharp coRuers.5.6 yews
5.6.1 Handness. Jaws shaill have a hardness of 36HIRCto 50 HRC.The gripping portion of the jaws and wirecutter shall be heat treated to a hardness of 56 HRC to64HRC. Jaw surfaces and edges shal not damage thewire being twisted.
5.6.2Cushlon Grip Threozt.Cushion grip throat whenprovided,shail grip and retain cut wire end. The ciushiongrip throat shal be nonmetallic and capable of with-standing normal use witout deteriorating or rubbingoff and shall pass the solvert resistance tesi in para.6.4.Cushiori grip throat shallreanain permanently alttachedunder normal use.
5.7 Jolnt Fastener
The fastener shall have a hardness of 25 HRC to 50HRC.
5.8Spir l Mechanlsm
The spiral mechanism shalt be capable of producinga close, uniform twist in safety wire without binding ofor damage to the aechanism. This mechanism shalil bewmounted between the handles of the pliers and shall beperznanently affixed to one hardle in such a poaitionthat the longitudinal axis of the mechanisn shall corre-spond to the langitudinal axis of the pliers.The mnecha-rism, when actated, shall cause pliers to rotate aboutits longitudinal axis in its intended direc tion(s). Fachfuactuation of the onechanisn shall cause the pliersto make the following minimum nunber of comipleterotations:
Jfor 6 in.(152 mm) size.2rotations (with auto-matic retun, 2 rotations)
bfor 9 in. (229 mn) size, 3 rotations (with automraticretun, 2s5rotations)
ffor 12 in.K(305 mm) size,4 rotations (with automaticreturn,31rotations) (ype ul Reversibie, 3 rotations)The design of the piechanism shall permnit a comfort-able, adequate grip by the operator.