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US 4,092,871 AGranted
Precision drive mechanism for converting fixed reciprocating motion to adjustable reciprocating motion
AssigneeDyne Corporation
InventorPatrick J. Cunningham
Life of this patent
Estimating the term…
Abstract
There is disclosed a precision drive mechanism having a base member with a drive plate slidably connected thereto, the drive plate having an elongated slot engaged by a bearing member, which in turn is threadably coupled to a lead screw. A pivot frame having an elongated arm is pivotally connected to the base member and is slidably engaged by the bearing member, the pivot frame being adapted to be connected to a source of fixed reciprocating motion whereby the drive plate is moved by the pivot frame in variable reciprocating motion precisely adjusted by moving the bearing member along the elongated arm of the pivot frame through rotation of the lead screw.
Claims6
Precision drive mechanism for converting fixed arcuate reciprocating motion into adjustable reciprocating rectilinear motion, comprising:
- a base member adapted to receive a drive plate in slidable connection therewith;
- a first drive plate having an elongated slot therein, said drive plate being slidably attached to said base member to provide rectilinear motion of said drive plate with respect to said base member;
- a first pivot frame having an elongated arm of which one end is pivotally attached to said base member, the other end of said elongated arm being adapted to be connected to a source of fixed arcuate reciprocating motion;
- a first bearing member slidably attached to said elongated arm of said pivot frame and substantially movable over the entire length thereof, said bearing member being adapted to threadably engage lead screw means;
- first lead screw means for threadably engaging said bearing member and being rotatably attached to said pivot frame, said lead screw means moving said bearing member along said elongated arm of said pivot frame when said lead screw is rotated;
- First turning means attached to said first lead screw means for adjustably rotating said first lead screw means, said first turning means having a projecting pin extending radially outward from said first lead screw means adjacent the end of said first lead screw means, a drive shaft rotatably mounted to said base member and having one end adapted to be turned with the other end thereof having a projecting pin extending radially outward therefrom, and a hollow cylindrical connector having two ends with each end having at least one longitudinal slot therein where one end of said hollow cylindrical connector is in sliding movable contact over the end of said first lead screw means with said at least one longitudinal slot engaging said projecting pin therein and the other end of said hollow cylindrical connector is in sliding movable contact over said other end of said drive shaft with said at least one longitudinal slot engaging said projecting pin of said drive shaft whereby said first lead screw means can pivot in reciprocating angular motion with respect to said drive shaft and said drive shaft can be turned to rotate said first lead screw means;
- and
- first connecting means fixedly attached to said first bearing member for slidably connecting said first drive plate through said elongated slot to said first bearing member whereby said first drive plate is moved in reciprocating rectilinear motion with respect to said base member by said first pivot frame when said other end of said elongated arm of said first pivot frame is connected to a source of fixed arcuate reciprocating motion, the magnitude of the reciprocating motion of said first drive plate being adjustable by moving said first bearing member along said elongated arm of said first pivot frame by rotating said first lead screw means.
5 more elements
Precision drive mechanism for adjustably driving a positive displacement syringe, comprising:
- a base member adapted to receive a drive plate in slidable connection therewith;
- a drive plate having an elongated slot therein and being adapted for connection to the piston shaft of a positive displacement syringe, said drive plate being slidably attached to said base member;
- positive displacement pump means having a movable piston, a piston shaft connected to said piston, a cylinder into which said piston is movably inserted and inlet and outlet check valves attached to said cylinder to control the flow of fluids into and out of said cylinder in response to the motion of said piston;
- a pivot frame having an elongated arm of which one end is pivotally attached to said base member, the other end of said pivot arm being adapted to be rotatably connected to an elongated driving rod;
- an elongated driving rod rotatably connected to said other end of said pivot arm the other end of said elongated driving arm being adapted to be connected to a source of rotary motion;
- a source of rotary motion rotatably connected to said other end of said elongated driving arm to move said other end in circular motion;
- a bearing member slidably attached to said elongated arm of said pivot frame, and movable over substantially the entire length thereof, said bearing member being adapted to threadably engage lead screw means;
- lead screw means for threadably engaging said bearing member and being rotatably attached to said pivot frame, said lead screw means moving said bearing member along said elongated arm of said pivot frame when said lead screw is rotated;
- and
- turning means attached to said lead screw means for adjustably rotating said lead screw means, said turning means having a projecting pin extending radially outward from said lead screw means adjacent the end of said lead screw means, a drive shaft rotatably mounted to said base member and having one end adapted to be turned with the other end thereof having a projecting pin extending radially outward therefrom, and a hollow cylindrical connector having two ends with each end having at least one longitudinal slot therein where one end of said hollow cylindrical connector is in sliding movable contact over the end of said lead screw means with said at least one longitudinal slot engaging said projecting pin therein and the other end of said hollow cylindrical connector is in sliding movable contact over said other end of said drive shaft with said at least one longitudinal slot engaging said projecting pin of said drive shaft whereby said lead screw means can pivot in reciprocating angular motion with respect to said drive shaft and said drive shaft can be turned to rotate said lead screw means;
- and
- connecting means fixedly attached to said bearing member for slidably connecting said drive plate through said elongated slot to said bearing means whereby said drive plate and said piston of said positive displacement pump may be moved in reciprocal rectilinear motion with respect to said base member by said source of rotary motion, the magnitude of the reciprocating rectilinear motion of said drive plate and piston being adjustable by moving said bearing member along said elongated arm of said pivot frame by rotating said lead screw means, thereby adjusting the magnitude of the reciprocal rectilinear motion of said piston and pumping capacity of said positive displacement pump.
9 more elements
Dependencies are inferred from the claim text.