Document RjOMKeMmx30xxb7NRRk7KEOma

69B4 ffcdntinued) .Navy Control. JANUARY, 1953 SupQftadw Usus Stplttitibgr, tMJ Snap Action Limit Switches--Types T-ll and. T-l 2 (Continued) mat. Application (Continued) such as overtravel, normal stopping, door switches, or Interlocking devices. The electrioal contacts may he used to tiAiutln control circuits or indicating and alarm circuits, The three types oi operating heads make these switches adaptable to a wide variety o! applications. .. Operation The limit srwitah- provided with the pushbutton operator head is operated by mechanically depressing the push-, button which extends through the operator head. This causes the movable contact to ship into a position which opens the normally dosed contacts' and doses the nop malty open contacts. The pushbutton rod provides a small amount oi overtravel alter the switch contacts operate. A mechanicd stop within the switch prevehts further move ment oi iho pushbutton. -The contacts remain in the tripped position as long as (he pushbutton is maintained depressed.' When released, the action o! a spring- returns the pushbutton to Its original pnqtttnn This causes the contacts to snap had: to their normal position. The operation of the limit switch provided with the pushroller type oi operating-head is accomplished in the-same manner as the pushbutton type. The limit switch provided with the roller, lever type o( operator is operated by moving the lever through an arc of 35 degrees. This action causes the switch to trip. When the operating lever is.released It will return to the free posi tion, canning the switch contacts to reset. . The operation of the single pole and double pde limit switches is fundamentally the same, the difference between the two types being only the arrangement oi the switch contacts. Description The type T-ll single -pole limit switch consists oi a common haslo switch mechanism which is available in-combination with any one oi three different types of operating heads. The switch mechanism consists ot a quick make and break device which actuates a movable electrical contact. The moveable contact normally closes the eiicuif between two stationary' contacts, and when tripped, due to the'actiou oi the operating head, moves to a posttips to.openthe normally contact and close-the circuit between twu stationary' normally open contacts. The mechanism is operated by a rod which extends through the end oi the ease to the operat ing head. The stationary contacts are assembled to- a mineral filled phenolio insulating block, provided with terminals at the front. This switch mechanism is mounted in a spraytight Tits T-12--Dooslb vou Dooms thuow limit switch with sourer lsvsx ovexatO*, Tips T-12 -- Dooms ols, ooosls raxow umr iwna wns aousa. isvsx omaAioa -- ovstr vrsw. CUTLER-HAMMER. INC. MILWAUKEE 1. WISCONSIN I t I'i-'i r !i 7-44