# US 4,984,939 A · Pneumatic tube transmission system with slow-down blower > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,984,939 A - Document ID: US4984939A - Status: Granted - Kind: A - Application number: 07/345,403 - Filed: 1989-05-01 - Granted: 1991-01-15 - Earliest claimed: 1989-05-01 - Assignees: Comco Systems - Inventors: Michael J. Foreman; Harold R. Greene - Web page: https://patentgrep.com/patent/US4984939A ## CPC - B65G 51/20: Braking arrangements - B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D) ## Abstract A pneumatic transmission system is provided. The system comprises a transmission tube having a first end and a second end. A blower adapted to force air from the first end to the second end of the transmission tube is interconnected to the first end of the transmission tube. A vacuum source having a capacity at least as great as that of the blower is connected to the transmission tube proximal the second end. The vacuum source creates a flow of air from the second end of the transmission tube to the vacuum source, thereby decelerating a carrier being transmitted to the second end of the transmission tube. ## Claims ### Claim 1 A pneumatic transmission system comprising: a transmission line having a channel formed therethrough, said transmission line having a first end and a second end, said second end being subjected to ambient pressure; a blower adapted to provide pressurized air to said first end of said transmission line, said blower having a predetermined air capacity; and a vacuum source having an air capacity at least as great as the air capacity of said blower, said vacuum source interconnected to said channel formed through said transmission line at a position proximal said second end relative to said blower, whereby said vacuum source creates a flow of air from said second end to said vacuum source through said channel formed through said transmission line during operation of said blower and said vacuum source, and whereby said flow of air from said second end to said vacuum source decelerates a carrier moving from said first end to said second end of said transmission line. ### Claim 2 (depends on 1) The pneumatic transmission system of claim 1 wherein said blower is reversible. ### Claim 3 (depends on 1) The pneumatic transmission system of claim 1 wherein an open terminal is interconnected to said second end of said transmission line, said open terminal comprising an end block and an access port. ### Claim 4 (depends on 1) The pneumatic transmission system of claim 1 wherein a terminal is interconnected to said second end of said transmission line, said terminal comprising an end block, an access port, and a means for closing said access port. ### Claim 5 (depends on 1) The pneumatic transmission system of claim 1 wherein said transmission line further comprises a curved section disposed between said first end and said second end. ### Claim 6 (depends on 5) The pneumatic transmission system of claim 5 wherein said vacuum source is interconnected to said transmission line at said curved section. ### Claim 7 (depends on 1) The pneumatic transmission system of claim 1 wherein said vacuum source includes a switching means whereby said vacuum source is activated when said blower forces air from said first end to said second end. ### Claim 8 A pneumatic transmission system comprising: a transmission line having a channel formed therethrough, said transmission line having a first end and a second end, said second end being subjected to ambient pressure; a reversible blower adapted to alternately provide pressurized air and a vacuum to said first end of said transmission line, said reversible blower having a predetermined air capacity; a vacuum source having an air capacity at least as great as the air capacity of said blower, said vacuum source interconnected to said channel formed through said transmission line at a position proximal said second end relative to said blower, whereby said vacuum source creates a flow of air from said second end to said vacuum source through said channel formed through said transmission line during operation of said blower and said vacuum source, and whereby said flow of air from said second end to said vacuum source decelerates a carrier moving from said first end to said second end of said transmission line. ### Claim 9 (depends on 8) The pneumatic transmission system of claim 8 wherein an open terminal is interconnected to said second end of said transmission line, said open terminal comprising nan end block and an access port. ### Claim 10 (depends on 8) The pneumatic transmission system of claim 8 wherein said transmission line further comprises a curved section disposed between said first end and said second end. ### Claim 11 (depends on 10) The pneumatic transmission system of claim 10 wherein said vacuum source is interconnected to said curved section. ### Claim 12 (depends on 8) The pneumatic transmission system of claim 8 wherein said vacuum source has a capacity greater than the capacity of said reversible blower. ### Claim 13 (depends on 8) The pneumatic transmission system of claim 8 wherein said vacuum source includes a switching means whereby said vacuum source is activated when said reversible blower forces air from said first end to said second end and whereby said vacuum source is deactivated when said reversible blower draws air from said second end to said first end. ### Claim 14 A pneumatic transmission system comprising: a transmission line having a channel formed therethrough, said transmission line having a first end and a second end, said second end being subjected to ambient pressure; a reversible blower adapted to alternately provide pressurized air and a vacuum to said first end of said transmission line, said reversible blower connected to said first end of said transmission line, and said reversible blower having a predetermined air capacity; a first terminal interconnected to said first end of said transmission line, said first terminal having an aperture formed therethrough whereby a carrier can be readily inserted or removed from said first terminal; a curved transmission line section having a channel formed therethrough disposed between said first end and said second end of said transmission line; a vacuum source having an air capacity at least as great as the air capacity of said blower, said vacuum source interconnected to said channel formed through said transmission line at a position proximal said second end relative to said blower, whereby said vacuum source creates a flow of air from said second end to said vacuum source through said channel formed through said transmission line during operation of said blower and said vacuum source, and whereby said flow of air from said second end to said vacuum source decelerates a carrier moving from said first end to said second end of said transmission line; a second terminal interconnected to said second end of said transmission line, said second terminal comprising an end block and having an access port formed therethrough. ### Claim 15 (depends on 14) The pneumatic transmission system of claim 14 further comprising a carrier having dimensions whereby it can be pneumatically transmitted through said transmission line.