JP-7855304-B2 - Dispenser

JP7855304B2JP 7855304 B2JP7855304 B2JP 7855304B2JP-7855304-B2

Inventors

前田信也

Assignees

株式会社吉野工業所

Dates

Publication Date: 20260508
Application Date: 20230224

Claims (3)

First cylinder and A first piston that slides on the first cylinder, A second cylinder having a larger cross-sectional area than the first cylinder, A second piston that slides on the second cylinder, A holding member that moves back and forth relative to the second cylinder, along with the first piston, the first cylinder, and the second piston, by external operation, An internal flow path that discharges fluid through a pump chamber partitioned by the first cylinder, the first piston, the second cylinder, and the second piston in accordance with the forward and backward movement of the holding member, A pressure accumulation unit provides a biasing force to move the first piston from an open position, which opens the opening/closing part of the internal passage, to a closed position, in order to increase the internal pressure of the pump chamber by the forward movement of the holding member relative to the second cylinder, The connection portion that connects the holding member to the first cylinder such that, upon external operation, the holding member moves forward relative to the first cylinder with the first piston, then moves forward relative to the second cylinder with the first cylinder and the second piston, and thereafter moves backward relative to the first cylinder, then moves backward relative to the second cylinder with the first cylinder and the second piston, The holding member biasing portion provides the holding member with a biasing force for the retraction movement of the second cylinder in order to retract the first cylinder and the second piston via the connecting portion, A discharger in which the Young's modulus of the second piston is smaller than that of the first cylinder.
The second cylinder has a retaining member attached to it, The forward end of the first cylinder has a projection that protrudes radially outward, The protruding portion abuts against the retaining member due to the retraction movement of the retaining member relative to the second cylinder. The discharger according to claim 1, wherein the second piston has a second piston body that slides on the second cylinder and a fitting portion connected to the second piston body that fits into the inner circumferential surface of the first cylinder.
The second cylinder comprises a second cylinder body and an end wall connected to the forward end of the second cylinder body. The discharger according to claim 1, wherein the second piston comprises a second piston body that slides on the second cylinder, a fitting portion that fits onto the inner circumferential surface of the first cylinder, an annular flat plate portion connecting the second piston body and the fitting portion, and a stop portion that protrudes forward from the annular flat plate portion and abuts against the end wall of the second cylinder due to the forward movement of the holding member relative to the second cylinder.

Description

This invention relates to a dispensing device. A discharger is known that comprises a first cylinder, a first piston sliding on the first cylinder, a second cylinder having a larger cross-sectional area than the first cylinder, a second piston sliding on the second cylinder, a holding member that moves back and forth relative to the second cylinder along with the first piston, first cylinder, and second piston by external operation, an internal flow path that discharges fluid through a pump chamber partitioned by the first cylinder, first piston, second cylinder, and second piston in accordance with the movement of the holding member, and a pressure accumulator that provides a biasing force to move the first piston from an open position that opens the opening/closing part of the internal flow path to a closed position that closes the opening/closing part, in order to increase the internal pressure of the pump chamber by the forward movement of the holding member (see, for example, Patent Document 1). Japanese Patent Publication No. 2002-66398 This is a cross-sectional view showing a discharge container having a discharger according to one embodiment of the present invention in an unused state.Figure 1 is a cross-sectional view showing the state of the holding member in the discharge container at the start of its forward movement.This is a cross-sectional view showing a state where the forward movement has progressed further from the state shown in Figure 2.This is a cross-sectional view showing a state where the forward movement has progressed further from the state shown in Figure 3. The following describes embodiments of the present invention with reference to the drawings. As shown in Figures 1 to 4, in one embodiment of the present invention, the discharger 1 comprises a first cylinder 2, a first piston 3 sliding on the first cylinder 2, a second cylinder 4 having a larger cross-sectional area than the first cylinder 2, a second piston 5 sliding on the second cylinder 4, a holding member 6 that moves forward and backward relative to the second cylinder 4 along with the first piston 3, the first cylinder 2, and the second piston 5 by external operation, an internal passage 7 that discharges fluid 8 through a pump chamber 7a partitioned by the first cylinder 2, the first piston 3, the second cylinder 4, and the second piston 5 in accordance with the forward and backward movement of the holding member 6, and the first piston 3 being moved to an open position that opens the opening/closing portion 7b of the internal passage 7 in order to increase the internal pressure of the pump chamber 7a by the forward movement of the holding member 6 relative to the second cylinder 4. The device includes a pressure accumulation unit 9 that provides a biasing force to move the opening/closing section 7b from its position to the closed position, a connection unit 10 that connects the holding member 6 to the first cylinder 2 so that, by external operation, the holding member 6 moves forward relative to the first cylinder 2 with the first piston 3, then forward relative to the second cylinder 4 with the first cylinder 2 and the second piston 5, and then backward relative to the first cylinder 2 with the first cylinder 2 and the second piston 5, and a holding member biasing unit 11 that provides a biasing force to the holding member 6 for backward movement relative to the second cylinder 4 in order to move the first cylinder 2 and the second piston 5 backward via the connection unit 10, wherein the Young's modulus of the second piston 5 is smaller than the Young's modulus of the first cylinder 2. According to the above configuration, external operation causes the holding member 6 to move forward relative to the first cylinder 2 along with the first piston 3, thereby increasing the internal pressure of the pump chamber 7a. As a result, the first piston 3 is moved from the closed position to the open position against the biasing force of the pressure accumulator 9, and the increased internal pressure of the pump chamber 7a allows the fluid 8 to be discharged forcefully to the outside. Further external operation causes the holding member 6 to move forward relative to the second cylinder 4 along with the first cylinder 2 and the second piston 5. The increased internal pressure of the pump chamber 7a holds the first piston 3 in the open position, allowing the forceful discharge of the fluid 8 to continue. Finally, releasing the external operation causes the holding member 6 to move backward relative to the second cylinder 4 due to the biasing force of the holding member biasing unit 11, returning it to its initial position. At the same time, the decrease in internal pressure of the pump chamber 7a allows the fluid 8 to be drawn into the pump chamber 7a from the upstream side. Thus, with the above configuration, during external operation, pressure is first accumulated by the first cylinder 2 and first piston 3, which have a smalle