Treadle-type pneumatic pump

Claim 2

A pump comprising first and second air chamber forming members having at least a portion thereof which is collapsible and subsequently recoverable to its original form to effect alternate discharge and intake of the air therewithin, valved conduit means connected to said first and second members for permitting inflow into and subsequent discharge of air under pressure out of said members during intake and discharge thereof respectively, said valve conduit means comprising a first conduit connected to and extending between said first and second air chamber forming members for supplying air into said members, valve means positioned within said first conduit and arranged for alternately admitting air into one of said members while air is being forced out of the other said member, valved discharge conduits connected to said first and second air chamber forming members for alternately discharging air under pressure from said members, and said air chamber forming members being located in spaced orientation for engagement by feet of an operator to cause the alternate collapse and recovery of said members.

Claim 3

A pump comprising first and second air chamber forming members having at least a portion thereof which is collapsible and subsequently expansible to effect alternate pressurizing and expansion of the air therewithin, valved conduit means connected between said first and second members for permitting inflow into and subsequent discharge of air under pressure out of said members during expansion and collapsing thereof respectively, said first and second air chamber forming members comprising substantially elliptical-shaped members in plan view each defining a separate air chamber arranged in spaced relationship with their major axes being parallel and being arranged for the engagement by the feet of an operator to cause the alternate expansion and contraction of said members, said valved conduit means comprising an inlet conduit extending between said first and second members and connected into each of the air chambers thereof, an inlet fitting connected into said inlet conduit centrally between said first and second air chambers, a discharge conduit extending between said first and second members and connected into each of the air chambers thereof, a discharge fitting connected into said dIscharge conduit between said first and second air chambers, inlet valve means disposed between said inlet fitting and said inlet conduit for selectively permitting inflow to the associated ones of said first and second air chamber forming members, and discharge valve means located between said discharge fitting and said discharge conduit for selectively permitting flow from the associated first and second air chambers outwardly through said discharge conduit to said discharge fitting.

Claim 4

A pump comprising first and second air chamber forming members having at least a portion thereof which is collapsible and subsequently expansible to effect alternate pressurizing and expansion of the air therewithin, valved conduit means connected between said first and second members for permitting inflow into and subsequent discharge of air under pressure out of said members during expansion and collapsing thereof respectively, said first and second air chamber forming members comprising substantially elliptical-shaped members in plan view each defining a separate air chamber arranged in spaced relationship with their major axes being parallel and being arranged for the engagement by the feet of an operator to cause the alternate expansion and contraction of said members, said valved conduit means comprising an inlet conduit extending between said first and second members and connected into each of the air chambers thereof, an inlet fitting connected into said inlet conduit centrally between said first and second air chambers, a discharge conduit extending between said first and second members and connected into each of the air chambers thereof, a discharge fitting connected into said dIscharge conduit between said first and second air chambers, inlet valve means disposed between said inlet fitting and said inlet conduit for selectively permitting inflow to the associated ones of said first and second air chamber forming members, and discharge valve means located between said discharge fitting and said discharge conduit for selectively permitting flow from the associated first and second air chambers outwardly through said discharge conduit to said discharge fitting.

Claim 5

A pump comprising first and second air forming members having at least a portion thereof which is collapsible and subsequently expansible to effect alternate pressurizing and expansion of the air therewithin, valve conduit means connected between said first and second members for permitting inflow into and subsequent discharge of air under pressure out of said members during expansion and collapsing thereof respectively, said chamber forming members being located in spaced orientation for engagement by the feet of an operator to cause the alternate expansion and contraction of said members, and a separate exhaust conduit connected to at least one of said first and second air chamber forming members, a tubular exhaust fitting connected through said exhaust conduit and having an opening in said fitting aligned with said exhaust conduit, and a tubular member of soft material arranged within said exhaust fitting enclosing the openings of said exhaust fitting to said exhaust conduit but being of a soft material permitting flexing thereof to open said openings for the outflow of air from the associated exhaust conduit.

Claim 6

A pump comprising first and second air forming members having at least a portion thereof which is collapsible and subsequently expansible to effect alternate pressurizing and expansion of the air therewithin, valve conduit means connected between said first and second members for permitting inflow into and subsequent discharge of air under pressure out of said members during expansion and collapsing thereof respectively, said chamber forming members being located in spaced orientation for engagement by the feet of an operator to cause the alternate expansion and contraction of said members, and a separate exhaust conduit connected to at least one of said first and second air chamber forming members, a tubular exhaust fitting connected through said exhaust conduit and having an opening in said fitting aligned with said exhaust conduit, and a tubular member of soft material arranged within said exhaust fitting enclosing the openings of said exhaust fitting to said exhaust conduit but being of a soft material permitting flexing thereof to open said openings for the outflow of air from the associated exhaust conduit.

Claim 7

A pump comprising first and second air chamber forming members having at least a portion thereof which is collapsible and subsequently expansible to effect alternate pressurizing and expansion of the air therewithin, valved conduit means connected between said first and second members for permitting inflow into and subsequent discharge of air under pressure out of said members during expansion and collapse thereof respectively, said chamber-forming members being located in spaced orientation for engagement by the feet of an operator to cause the alternate expansion and contraction of said members, said valved conduit means comprising at least one conduit extending outwardly from at least one of said first and second air chamber forming members, a tubular member connected to said conduit and having an inlet opening, said tubular member defining a valve seat at a spaced location from said inlet opening and being connected to said inlet conduit below said valve seat, said tubular member having a flange portion defining a second valve seat spaced from said first seat and an opening for inlet air centrally of said second valve seat, and a valve disk member floating between said second valve seat and said first valve seat.

Claim 8

A pump comprising first and second air chamber forming members having at least a portion thereof which is collapsible and subsequently expansible to effect alternate pressurizing and expansion of the air therewithin, valved conduit means connected between said first and second members for permitting inflow into and subsequent discharge of air under pressure out of said members during expansion and collapse thereof respectively, said chamber-forming members being located in spaced orientation for engagement by the feet of an operator to cause the alternate expansion and contraction of said members, said valved conduit means comprising at least one conduit extending outwardly from at least one of said first and second air chamber forming members, a tubular member connected to said conduit and having an inlet opening, said tubular member defining a valve seat at a spaced location from said inlet opening and being connected to said inlet conduit below said valve seat, said tubular member having a flange portion defining a second valve seat spaced from said first seat and an opening for inlet air centrally of said second valve seat, and a valve disk member floating between said second valve seat and said first valve seat.