초록 ▼

A pneumatic pusher having a main body, a flow-guiding body, a moving body, and a delivery tube. The flow-guiding body includes a front tube with a smaller diameter and a rear tube with a larger diameter. The delivery tube is mounted on the front tube in such a way that the outer wall of the delivery

A pneumatic pusher having a main body, a flow-guiding body, a moving body, and a delivery tube. The flow-guiding body includes a front tube with a smaller diameter and a rear tube with a larger diameter. The delivery tube is mounted on the front tube in such a way that the outer wall of the delivery tube and the inner wall of the main body define a return pressure chamber. A first gas-distributing channel extending from a first air outlet at one side of the main body leads directly to the inner side of the delivery tube. The side of the first air inlet of the main body communicates with a second gas-distributing channel. The second gas-distributing channel includes an exit located at one side of the return pressure chamber of the delivery tube. The air pressure provided through the second gas-distributing channel serves as cushioning force in pushing the delivery tube outwardly. When the moving plunger blocks the gas distributing chamber in such a way that the gas is stopped to be injected through the first gas distributing channel into the pushing chamber for bringing the delivery tube forward, the gas pressure injected through the second gas distributing channel into the return pressure chamber acts as inward return force for the delivery tube. Therefore, the reciprocating movement of the delivery tube on the front tube can be completely done by the airflow.

대표청구항 ▼

What is claimed is: 1. A pneumatic pusher, comprising: a) a main body having a hollow tube configuration with a first orifice and a second orifice at both ends thereof, a side of the main body having a first air inlet for injecting an external pressurized gas and a first air outlet for guiding the

What is claimed is: 1. A pneumatic pusher, comprising: a) a main body having a hollow tube configuration with a first orifice and a second orifice at both ends thereof, a side of the main body having a first air inlet for injecting an external pressurized gas and a first air outlet for guiding the air flow, the first air outlet externally communicating with a gas distributing chamber, the gas distributing chamber being controlled by a moving plunger in an open or a close state, a side of the gas distributing chamber including a gas distributing channel extending into a hollow tube at the center of the main body; b) a flow-guiding body axially inserted via the second orifice into the main body and held by a fixing unit in place, the flow-guiding body including a front tube having a first diameter and a rear tube having a second diameter, wherein the first diameter is smaller than the second diameter, a wall of the front tube being provided with at least one gas hole, an end cap being attached to a rear end of the rear tube, the wall of the flow-guiding body including a second air inlet and a second air outlet corresponding to the first air inlet and the first air outlet of the main body, respectively, an inner wall of the rear tube defining a flow-guiding chamber, an outer wall of the front tube defining a pushing chamber that is located at a position corresponding to an exit of the first gas distributing channel; c) a moving body disposed within the rear tube of the flow-guiding body, a front part of the moving body being slimmer than a rear part thereof, an air valve blocking a mouth of the front tube being formed at the front end of the moving body, a piston dividing the flow-guiding chamber into a front and a rear air pressure chamber being tightly fitted within the rear tube, the front and the rear air pressure chamber having different pressure areas, a small airflow channel being formed between the front and the rear air pressure chamber so that the air pressure chambers isolated from each other may be communicated by the small airflow channel; and d) a delivery tube mounted and movable on the front tube, a rear end of the delivery tube including a flange tightly fitting within the main body, wherein a periphery part of a portion of the delivery tube forward of the flange and the inner wall of the main body define a return pressure chamber, and wherein a side of the first air inlet of the main body communicates with a second gas distributing channel, and the second gas distributing channel includes an exit located at one side of the return pressure chamber of the delivery tube, wherein pressurized gas through the second gas distributing channel serves to provide a cushioning force in pushing the delivery tube, and wherein, when the moving plunger blocks the gas distributing chamber in such a way that gas supplied from an external source is prevented from being injected through the first gas distributing channel into the pushing chamber for bringing the delivery tube forward, wherein pressurized gas injected through the second gas distributing channel into the return pressure chamber acts to provide an inward return force for the delivery tube; accordingly, the reciprocating movement of the delivery tube on the front tube can be completely done by the air flow. 2. The pneumatic pusher as recited in claim 1 wherein a fixing unit includes a bolt mounted on the main body, a yoke disposed on the bolt, and a nut, and wherein the nut is tightened on the bolt for engaging a longer arm of the yoke into a groove of the flow-guiding body. 3. The pneumatic pusher as recited in claim 1 wherein the end cap includes a bolt for controlling the reciprocating movement of the moving body within the rear tube. 4. The pneumatic pusher as recited in claim 1 wherein the front end of the delivery tube is externally provided with an O-ring, and wherein a rubber ring is disposed on an inner wall at the front opening of the delivery tube. 5. The pneumatic pusher as recited in claim 1 wherein the moving plunger includes a solenoid valve, and a pressure-relief channel is formed within the moving plunger. 6. The pneumatic pusher as recited in claim 5 wherein the bottom of the main body is provided with a handle and a trigger controlling the start or stop of the solenoid valve, and wherein an extension pipe fits within the first orifice at the front end of the main body, and wherein the top of the main body includes a feeding port adjacent to the front end of the delivery tube.