摘要:
An adjustable pipette (10) includes a body (12) containing a plunger assembly (14) including a thumb button (22) that is axially moved in alternating relatively shorter sample aspirating and relatively longer dispensing strokes. Guide slots (108) in a guide sleeve (32) receive a stop pin (52) carried by a plunger shaft (48), and the slots (108) define two axially and circumferentially spaced lower stops (104, 106) for aspirating and dispensing strokes respectively. The thumb button (22) includes offset lobes (112, 114) that apply a rotational torque to the plunger shaft (48) when pressed by the user. The user presses one lobe (112) for an aspirating stroke to rotate the plunger shaft (48) in one direction and align the stop pin (52) with uppermost lower stop (104) for a relatively short aspirating stroke and the user presses the other lobe (114) for a dispensing stroke to rotate the plunger shaft (48) in the other direction and align the stop pin (52) with lowermost lower stop (106) for a relatively long dispensing stroke. A window (116) in the body permits the user to view and thereby understand the function of the lower stop selecting mechanism.
摘要:
An adjustable pipette (10) includes a body (12) containing a plunger assembly (14) including a thumb button (22) that is axially moved in alternating relatively shorter sample aspirating and relatively longer dispensing strokes. Guide slots (108) in a guide sleeve (32) receive a stop pin (52) carried by a plunger shaft (48), and the slots (108) define two axially and circumferentially spaced lower stops (104, 106) for aspirating and dispensing strokes respectively. The thumb button (22) includes offset lobes (112, 114) that apply a rotational torque to the plunger shaft (48) when pressed by the user. The user presses one lobe (112) for an aspirating stroke to rotate the plunger shaft (48) in one direction and align the stop pin (52) with uppermost lower stop (104) for a relatively short aspirating stroke and the user presses the other lobe (114) for a dispensing stroke to rotate the plunger shaft (48) in the other direction and align the stop pin (52) with lowermost lower stop (106) for a relatively long dispensing stroke. A window (116) in the body permits the user to view and thereby understand the function of the lower stop selecting mechanism.
摘要:
A battery powered flashlight (10) includes a body (20) holding a battery (30), lamp (22), reflector (26) and an electric circuit (32) including a switch (34) for connecting and disconnecting the battery to selectively energize and turn off the lamp. The flashlight includes a lens supported adjacent an end (50) or side of the body in front of the lamp and reflector forming a rectangular beam (14) of light when the lamp is energized for providing a non-glare illumination of a relatively small rectangular area (16) such as along a sidewalk or a stair tread. The flashlight may also include a second lamp (24) and reflector (28) at an opposite end (52) of the case providing a spotlight (12) and a switch (90) for selecting between the spotlight and the area illuminating beam. The flashlight may include a carrying handle in the form of a bail (36) which acts to operate the switch for initiating the rectangular beam of light or alternatively the spotlight. When the handle is in an open or carrying condition for supporting the flashlight, the case depends downwardly therefrom and when the handle is in a closed position portions of the handle provide protective covers (134, 136) for each of the lens and lamp combinations while the flashlight is not in use.
摘要:
A continuously adjustable liquid mixing device (10) for intermixing selectively adjustable volumes of several liquids comprises a body (12) for holding a plurality of volumes of said liquids including a recess (14) at an upper end. A mechanism is provided for drawing up the volumes of liquid into the body and thereafter expelling the same from a lower end. A volume adjusting selecting mechanism (22) is provided for at least one of the volumes including a rotary element (26) mounted in the recess and frictionally engaging (28) a wall surface (14a) thereof for retaining a selected volume that is desired. A rotary drive system (34) is provided for rotating the volume adjustment mechanism (22) and is readily accessible externally of the body for convenient manipulation to select a desired volume. The drive system (34,36) is movable between an outer operating position for easy manipulation and a retracted position when not in use.
摘要:
A continuously adjustable liquid mixing device (10) for intermixing selectively adjustable volumes of several liquids comprises a body (12) for holding a plurality of volumes of said liquids including a recess (14) at an upper end. A mechanism is provided for drawing up the volumes of liquid into the body and thereafter expelling the same from a lower end. A volume adjusting selecting mechanism (22) is provided for at least one of the volumes including a rotary element (26) mounted in the recess and frictionally engaging (28) a wall surface (14a) thereof for retaining a selected volume that is desired. A rotary drive system (34) is provided for rotating the volume adjustment mechanism (22) and is readily accessible externally of the body for convenient manipulation to select a desired volume. The drive system (34,36) is movable between an outer operating position for easy manipulation and a retracted position when not in use.
摘要:
A battery powered flashlight (10) includes a body (20) holding a battery (30), lamp (22), reflector (26) and an electric circuit (32) including a switch (34) for connecting and disconnecting the battery to selectively energize and turn off the lamp. The flashlight includes a lens supported adjacent an end (50) or side of the body in front of the lamp and reflector forming a rectangular beam (14) of light when the lamp is energized for providing a non-glare illumination of a relatively small rectangular area (16) such as along a sidewalk or a stair tread. The flashlight may also include a second lamp (24) and reflector (28) at an opposite end (52) of the case providing a spotlight (12) and a switch (90) for selecting between the spotlight and the area illuminating beam. The flashlight may include a carrying handle in the form of a bail (36) which acts to operate the switch for initiating the rectangular beam of light or alternatively the spotlight. When the handle is in an open or carrying condition for supporting the flashlight, the case depends downwardly therefrom and when the handle is in a closed position portions of the handle provide protective covers (134, 136) for each of the lens and lamp combinations while the flashlight is not in use.