ASME B107.18:2003 pdf download PLIERS: WIRE TWISTER
Wire twister pliers shall incorporate a device, whichwhen actuated, will cause the pliers to rotate about itslongitudinal axis. The halves of the pliers shall be permnanently joined with a through fastener that shall act asthe pivot or fulcrum point of the pliers. A locking devicewhen engaged, shall hold the handles in a closed posi.tion in such a maner as to cause the jaws to firmly andsecurely grip and hold stands of lock wire.A wire clearance openingg 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 perrrit the user to swiftly andeasily deflect double strands of wire out of the sides ofte jaws and away from the cutting edges when performing continuous (multiple) lock wiring operatiansThe nose design shall be as shown in Figs. 1 through 4and blend with the radius of the sides of the pliers inaccordance with good comunercial practice. The maximum permissible opening at the top of the jaws, whenclosed, shall be as shown in Figs, 1 and 2
5.2 Material
The materials used in the marwfacture of the pliersshall be such as to produce pliers conforming to therequirements specified herein.
5.3 Finish
Surfaces shall have a rust preventive treatinent andbe essentially free from pits, nodules, burrs, cracks, andother conditions that would adversely affect the performance or safety of the tool. When provided, coatingsshall be adherent, smooth, continuous, and free homany conditions that would interfere with their protectivevalue, safety and fnction.
5.4Marking
Pliers shall be marked in a plain and perranent man-ner with the manufacturer’s narne or with a trademarkof such lmown character that the source of manufacturtand country of origin shall be radily determined. Marking shall be as pertanent as the nortal life expectancof the pliers to which it is applied (providing the markedsurface has not been subjected to a fretting or abradlingaction) and be capable of withustanding the cleaning procedures normally experienced during its intended use.
5.5 Handles
Handles shall have a hardness of 36 HRC to 50 HRCshall be shaped to provide a comfortable handgrip, andshall be free from rough edges and sharp comuers.
5.6 jaws
5.6,1 Hardnes5[aws shall have a hardness of36HRCto 50 HRC The gripping portion of the jaws and wirecutter shall be heat treated to a hardness of 56 HRC to64 HRC. Jaw surfaces and edges shall not damage thewire being twisted.
5.6.2 Cushlon Grip Throat. Cushion grip throat, wherprovided,shall grip and retain cut wire end, The cushiongrip throat shal be nonmetallic and capable of with.standing notmal use without deberiorating or rubbingoff and shall pass the solvent resistance test in para. 6.4Cushion grip throat shall remain permanently attachedunder norrnal use.
5.? Joint Fastener
The fastener shall have a hardness of 25 HRC to 50HRC
5.8 Spiral Mechanlsm
The spiral echanism shall be capable of producinga close uniform twist in safety wir without binding ofor damage to the aurchanismn This mecharism shal bemounted between the handles of the pliers and shall bepermnanently affxed to one handle in such a positionthat the longitudinal axis of the mechanism shal correspond to the langitudirual axis of the pliers. The mechanism, when actuated, shall cause pliers to rotate aboutits longitudinal axis in its intended direction(s). Eachfull actuation of the mechanism shall cause the phiersto make the following minimum nueber of completerotations;
ASME B107.18:2003 pdf download
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