Pumping device for promoting patients breathing

Claim 2

A motor driven pumping device for actuating a patient''s breathing assisting apparatus comprising, in combination, a bellows-type pumping assembly having a stationary end portion and a reciprocating opposite end portion for cyclically varying the volume of a chamber defined between said end portions from a given minimum to a maximum volume, and a spring-loaded valve; a mechanism including an oscillating arm and a connecting rod pivotally connected at opposite ends to said arm and to said reciprocating end portion; driven crank means for oscillating said arm at a given angular amplitude, said crank means comprising a flywheel rotatable about an axis, a crank pin eccentrically secured to said flywheel, a roller rotatably mounted on said pin, and means operatively connecting said roller to said oscillating arm for oscillating the latter during rotation of said flywheel, said flywheel having a camming surface extending about said axis; and cam follower means engaging said camming surface of said flywheel and said spring-loaded valve for actuating the latter in phased relationship with said pumping device.

Claim 3

A device as defined in claim 1, wherein said flywheel has a peripheral surface having a first portion of greater radial distance from said axis of said flywheel than a second portion thereof, said peripheral surface constituting said camming surface engaged by said cam follower means.

Claim 4

A device as defined in claim 1, wherein said connecting rod is pivotally connected at one end to said reciprocating end portion and including a component adjustably connected to said oscillating arm and pivotally connected to the other end of said connecting rod to provide an operator controlled adjustment for the acting length of said oscillating arm from the axis of pivotal connection of said other end to the axis about which said oscillating arm oscillates, said component being displaceable lengthwise of said arm along an arc having its center substantially at the axis at which said connecting rod is pivotally connected to said reciprocating end portion when said assembly is in a position at which said chamber has a minimum value.

Claim 5

A motor driven pumping device for actuating a patient''s breathing assisting apparatus comprising, in combination, a bellows-type pumping assembly having a stationary end portion and a reciprocating opposite end portion for cyclically varying the volume of a chamber defined between said end portions from a given minimum to a variable maximum volume; a mechanism including a stationary shaft, an oscillating arm pivotally mounted in the region of one end on said shaft and provided with an arc-shaped groove extending lengthwise of said oscillating arm, a block slidably displaceable along said groove and having a bore provided with an inner screw thread, a rod provided with an outer screw thread threadingly engaged with said inner screw thread of said bore, a connecting rod pivotally connected at opposite ends to said reciprocating portion and said block, driven crank means for oscillating said arm about the axis of said shaft and including a slotted arm, a first tubular member rotatably supported about said shaft and fixedly secured to said oscillating arm and said slotted arm of said crank means, a second tubular member rotatably supported about said shaft and having a second block fixedly secured thereto, said second block rotatably supporting said threaded rod perpendicularly to the axis of said shaft, a first bevel gear fixedly secured to said rod adjacent to said second tubular member, a third tubular member rotatably supported about said shaft and having a second bevel gear fixedly secured thereto in mesh with said first bevel gear, and actuator means connected to said third tubular member fOr rotating the same.

Claim 6

A motor driven pumping device for actuating a patient''s breathing assisting apparatus comprising, in combination, a bellows-type pumping assembly having a stationary end portion and a reciprocating opposite end portion for cyclically varying the volume of a chamber defined between said end portions from a given minimum to a variable maximum volume; a mechanism including a stationary shaft, an oscillating arm pivotally mounted in the region of one end on said shaft and provided with an arc-shaped groove extending lengthwise of said oscillating arm, a block slidably displaceable along said groove and having a bore provided with an inner screw thread, a rod provided with an outer screw thread threadingly engaged with said inner screw thread of said bore, a connecting rod pivotally connected at opposite ends to said reciprocating portion and said block, driven crank means for oscillating said arm about the axis of said shaft and including a slotted arm, a first tubular member rotatably supported about said shaft and fixedly secured to said oscillating arm and said slotted arm of said crank means, a second tubular member rotatably supported about said shaft and having a second block fixedly secured thereto, said second block rotatably supporting said threaded rod perpendicularly to the axis of said shaft, a first bevel gear fixedly secured to said rod adjacent to said second tubular member, a third tubular member rotatably supported about said shaft and having a second bevel gear fixedly secured thereto in mesh with said first bevel gear, and actuator means connected to said third tubular member fOr rotating the same.

Claim 7

A motor driven pumping device comprising, in combination, a bellows-type pumping assembly having a stationary end portion and a reciprocating opposite end portion for cyclically varying the volume of a chamber defined between said end portions from a minimum to a maximum volume; rotatable crank means; and motion transmitting means between said crank means and said reciprocating end portion of said bellows for moving said reciprocating end portion along a pumping stroke reducing the volume of said chamber and an opposite stroke, said motion transmitting means comprising an oscillating arm oscillated by said crank means, a connecting rod including two telescopically fitted components pivotally connected to said reciprocating end portion and to said reciprocating arm, respectively, and spring means for delaying the motion transmitted to said reciprocating end portion when the pressure built up in said chamber during said pumping stroke reaches a given value, said spring means being interposed between said components and loaded to transmit a force to said reciprocating end portion not greater than that necessary to build up a pressure of said given value in said chamber.

Claim 8

A motor driven pumping device comprising, in combination, a bellows-type pumping assembly having a stationary end portion and a reciprocating opposite end portion for cyclically varying the volume of a chamber defined between said end portions from a minimum to a maximum volume; rotatable crank means; and motion transmitting means between said crank means and said reciprocating end portion of said bellows for moving said reciprocating end portion along a pumping stroke reducing the volume of said chamber and an opposite stroke, said motion transmitting means comprising an oscillating arm oscillated by said crank means, a connecting rod including two telescopically fitted components pivotally connected to said reciprocating end portion and to said reciprocating arm, respectively, and spring means for delaying the motion transmitted to said reciprocating end portion when the pressure built up in said chamber during said pumping stroke reaches a given value, said spring means being interposed between said components and loaded to transmit a force to said reciprocating end portion not greater than that necessary to build up a pressure of said given value in said chamber.