
basecul pull

ack bascule pull (jise drobridge yaa lifting brij key roop mein bhee jaanaa jaataa haye) ack chalane yogya pull haye jiska pratibhaar hotaa haye joe naav yatayat key liye nikasi pradaan karane key liye apane oopar kii or jhoolate hue ack spain yaa patte koo lagaatar santulit kartaa haye. yeh ekal yaa dou-patti vaalaa hoe sakata haye.
yeh naam santulan paimaane key liye francisi shabd seey aaya haye, joe ack hii siddhant koo niyojit kartaa haye. bascule pull sabse aam prakaar key chala kshetra hain kyonki way jaldi khulate hain aur unhein sanchaalit karane key liye apekshaakrit cumm oorjaa kii aavashyakta hoti haye, jabaki samudri yatayat key liye aseemit urdhvaadhar nikasi kii sambhavana pradaan karate hain.
itihas.
pracheen kaal seey basecul pulon kaa upayog kiya jaataa rhaa haye, lekin 1850 key dashak mein bhaap shakti koo apanaane taka, bahut lambe, bhaari vistaar koo vyaavhaarik anuprayog key liye paryaapt teji seey sthanantarit naheen kiya jaa sakaa.
prakaar.
teen prakaar key basecul pull hotey hain aur iss kshetra key pratibhaar pull key deck key oopar yaa neeche sthit hoe sakate hain.
sthir-trunian (kabhi-kabhi ack "shikago" basecul) ack badey axel key chaaron or ghoomata haye joe spain (oun) koo badhaata haye. shikago bascule naam usa sthaan seey liya gayaa haye jahan iska vyaapak roop seey upayog kiya jaataa haye, aur yeh fixed-trunian key joseph stross dwara ack parishkaran haye.
trunian (kabhi-kabhi ack "sherzer" rolling lift), ack rocking-cheyar bases key samaan track parr roll karke spain koo badhaata haye. sherzer" rolling lift ack parishkaran haye jise 1893 mein americi engineer villium donald sherzer dwara patent karaaya gayaa thaa.
durlabh roll prakaar khulane parr trunian parr anudairdhya gati key saath rolling lift koo jodata haye. ise theoder roll dwara patent (1901) kiya gayaa thaa. kuchh jeevit udaharanon mein seey ack portland, oregan mein broadway brij (1913) haye.

