公开(公告)号：US4435989A

公开(公告)日：1984-03-13

申请号：US327393

申请日：1981-12-04

申请人： Richard C. Meyer ,  Edward L. Carroll

发明人： Richard C. Meyer ,  Edward L. Carroll

IPC分类号： B01L3/02 ,  G01F13/00

CPC分类号： B01L3/0224

摘要： Plunger operated pipet operable to execute different lengths of plunger movement during successive fluid pickup and fluid discharge operations or strokes. A stop member is movable between first and second locations in the pipet body to halt plunger movement at two different positions. A drive spring for driving the stop member from one location to the other is energized by a manually operable arming element and is retained in one location against action of the drive spring during a first plunger stroke. A release mechanism responsive to plunger movement during the first stroke disables the retaining means allowing the drive spring to move the stop member to the second location at which position the plunger is halted during the succeeding discharge stroke. The arming element is actuated by and in response to positioning of a replaceable tip on the pipet body. The arming element exerts a force on the tip sufficient to expel the tip from the body unless the tip is properly seated on the body thus ensuring that the pipet is armed if the tip is properly seated. A signalling system is provided which signals the occurrence of the second or fluid dispensing stroke of plunger movement.

摘要翻译： 柱塞操作的移液管可操作以在连续的流体拾取和流体排放操作或冲程期间执行不同长度的柱塞移动。 停止构件可在移液管体中的第一和第二位置之间移动，以阻止柱塞在两个不同位置运动。 用于将停止构件从一个位置驱动到另一个位置的驱动弹簧通过手动操作的布防元件来激励，并且在第一柱塞行程期间被保持在一个位置以抵抗驱动弹簧的作用。 在第一冲程期间响应于柱塞移动的释放机构使得保持装置允许驱动弹簧将止动构件移动到在随后的排出冲程期间柱塞被停止的位置的第二位置。 武装元件由可替换的尖端定位在移液管主体上并响应于移液器主体的定位。 武装元件在尖端上施加足以将尖端从身体排出的力，除非尖端被正确地安置在身体上，从而确保移液管在尖端正确就位时被武装。 提供了一种信号系统，其指示柱塞运动的第二或液体分配行程的发生。