balance lever造句

• Each bogie consisted of a cast box, four twin rubber-covered road wheels connected by balancing levers and two one-quarter elliptic leaf springs.
• As boiler diameter increased, some forms were even set inside the boiler shell, with the springs housed in a recess inside and only the valves and balance lever protruding outside.
• Other changes included Girling brakes with wedge and roller shoe expansion and balance lever compensation using operating rods in tension with automatic compensation between front and rear brakes all four of which might be applied by hand or foot.
• You could also devise something where the perch that the bird stands on to get at the food is a counter-balanced lever that closes a door and shuts off access to the food to any bird that weighs more than the counterweight-this could be used to shut out large birds and let the smaller ones have access to the food.