Discharging tool

Abstract

To provide a discharging tool which allows a workload applied to a pressing part by a user when discharging a discharge object, to be larger than a workload applied to a piston disposed in a cylinder, and which improves operability reduction that makes an operation feeling of the pressing part gradually heavier in accompany with an increase in a discharge amount.SOLUTION: A discharging tool 100 includes a transfer mechanism 230 which transfers operation force applied to a pressing part 220 to a piston 210 and converts an action of the pressing part when the operation force is applied, to linear motion of the piston. A fixed end link 240 and a drive end link 250 provided in the transfer mechanism increase or decrease a link angle θ3 formed between the fixed end link and the drive end link in accompany with movement of the piston from an initial position P1 toward a forward movement limit position P2.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a discharging device configured to be detachable from a container that holds a discharge target.

Background Art

[0002] Generally, in a discharging device having a pressing part such as a pump or a trigger that is operated by a user's hand, when the user performs a discharging operation, especially when the user operates while gripping the pressing part with one hand, the operating force of the pressing part is gradually increased, and the discharge amount of the discharge target is increased as the operating force increases. However, in the process of performing such an operation, the user may sometimes have to bear the burden of increasing the operating force so as to exceed the increase rate of the discharge amount. This phenomenon is not only caused by the increase in the discharge amount of the discharge target linked to the operating force of the pressing part, but mainly due to the increase in sliding resistance associated with increasing the cylinder diameter incorporated in the discharging device and the increase in the reaction force of the spring for returning the piston disposed in the cylinder or the like to the origin, which is due to the product specifications. In particular, the increase in the reaction force of the spring, as the discharge amount increases in conjunction with the increase in the user's operating force, proportionally makes the user's operation feeling gradually heavier and requires a greater operating force as the discharge amount increases. Therefore, it can be said that there is room for improvement in the usability of conventional discharging devices.

[0003] In relation to the above problems, for example, Patent Document 1 discloses a discharging device in which the length of the gripping part of a trigger lever on which the user places a finger when performing a discharging operation is increased to increase the distance between the operation position and the fulcrum, thereby reducing the user's operating force or stabilizing the finger placement position when the user places a finger. Further, for example, Patent Document 2 discloses a discharging device that employs a mechanism in which two trigger levers for increasing the operating force are connected in series in order to enable the user to increase the operating force applied to the trigger lever.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-130416 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-1674 [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] According to the ejection device described in Patent Document 1 and Patent Document 2, it is considered possible to reduce the operating force required when the user performs the ejection operation.

[0006] However, in any ejection device, the mechanism of the pressing part applies the principle of a lever considering the distance between the fulcrum (the rotation axis of the trigger lever) and the force point (the gripping part of the trigger lever gripped by the operator). Therefore, the amount of work represented by the product of the operating force applied by the user to the pressing part and the moving distance (the moving distance of the piston for driving the ejection) is generally constant. Therefore, when the operating force applied by the user to the pressing part is reduced, the operating amount increases in inverse proportion to the reduction of the operating force. In addition, when the user operates the pressing part, the user grips the pressing part with the fingers hooked on the pressing part. However, if it exceeds the movable range of the user's hand, the user cannot operate the pressing part. Therefore, there is a limit to reducing the operating force by increasing the distance between the fulcrum and the force point. From this, even if the mechanisms disclosed in Patent Document 1 and Patent Document 2 are adopted, there are limits in terms of increasing the ejection amount.

[0007] The present invention has been made based on the above problems, and it is possible to make the amount of work applied by the user to the pressing part when ejecting the ejection target larger than the amount of work applied to the piston arranged in the cylinder, and to improve the operability such as the operating feeling of the pressing part gradually becoming heavier as the ejection amount increases. An ejection device is provided. [Means for Solving the Problems]

[0008] The above object of the present invention is achieved by any one of the following means (1) to (5).

[0009] (1) A discharging device configured to be detachable from a container that holds a discharge target, a piston configured to be reciprocally movable between an initial position and a forward limit position located on a straight line of the initial position, a pressing portion to which a user applies an operating force, a transmission mechanism that transmits the operating force to the piston and converts the movement of the pressing portion when the operating force is applied into a linear motion of the piston, a spring portion that returns the piston to the initial position when the application of the operating force to the pressing portion is released, and a piston driving portion including the spring portion, a cylinder that holds the piston and sucks and discharges the discharge target held inside the container in conjunction with the linear motion of the piston, a discharge port that discharges the discharge target sucked through the cylinder to the outside, a communication passage that communicates the discharge port with the inside of the container, a discharge device main body including a check valve member that controls fluid communication between the discharge port and the inside of the container in conjunction with the linear motion of the piston, The transmission mechanism a fixed-end link including a fixed end rotatably held at a predetermined fixed position of the discharge device main body and a first connection end located at an end opposite to the fixed end, a second connection end rotatably connected to the first connection end of the fixed-end link, and a movable end located at an end opposite to the second connection end and configured to move the piston toward the forward limit position in conjunction with the rotation of the second connection end when the operating force is applied to the pressing portion, and a drive-end link including the movable end, The fixed end of the fixed-end link is located on an extension of the orbit of the linear motion of the piston, The fixed-end link and the drive-end link are configured to increase or decrease the link angle formed between the fixed-end link and the drive-end link as the piston moves from the initial position toward the forward limit position, a discharging device.

[0010] (2) The pressing portion is attached to the ejector body in a rotatable state, The transmission mechanism, Comprises a third connecting end rotatably connected to the first connecting end and the second connecting end, and a transmission link for changing the link angle in conjunction with the operation of the pressing portion, Connects the movable end and the piston, and has a piston drive link for transmitting the movement of the movable end to the piston, The link angle increases to less than 180° as the piston moves from the initial position toward the forward limit position, the discharging device according to (1) above.

[0011] (3) The link angle is 120° or more when the piston is in the initial position, and 178° or less when the piston is in the forward limit position, the discharging device according to (2) above.

[0012] (4) The pressing portion is integrally formed with the fixed-end link, The ejector body has a fitting portion in which the fixed end of the fixed-end link is rotatably fitted, The pressing portion and the fixed-end link are attached to the ejector body in a rotatable state via the fitting portion, The transmission mechanism is connected to the piston and has a connecting portion extending on the extension of the linear motion of the piston, The movable end of the drive-end link is connected to the piston via the connecting portion, and is configured to be movable together with the connecting portion in accordance with the operation of the pressing portion, The discharge device according to (1) above, wherein the link angle decreases as the piston moves from the initial position toward the forward limit position.

[0013] (5) When the sum of the drive-end link angle formed between a straight line along the extending direction of the drive-end link and a reference straight line that is orthogonal to a straight line along the moving direction of the movable end and passes through the rotation center positions of the first connection end and the second connection end, and the fixed-end link angle formed between a straight line along the extending direction of the fixed-end link and the reference straight line is defined as the reference angle, The discharge device according to (4) above, wherein the reference angle is 90° or more when the piston is in the initial position and 175° or less when the piston is in the forward limit position. [Effect of the Invention]

[0014] The discharge device according to (1) above has a transmission mechanism that transmits the operating force applied by the user to the pressing portion to the piston and converts the movement of the pressing portion when the operating force is applied into the linear movement of the piston. The transmission mechanism has a fixed-end link and a drive-end link, and is configured to increase or decrease the link angle formed between the fixed-end link and the drive-end link as the piston moves from the initial position toward the forward limit position.

[0015] When the user operates the pressing part, and in conjunction with this operation, the intersection point of the first connecting end and the second connecting end located at the rotation center position between the fixed-end link and the driving-end link is pushed up (or pushed down), the fixed-end link and the driving-end link slide in opposite directions to each other so as to increase the distance between the fixed end and the movable end with a force greater than the force pushing up the intersection point. With such a transmission mechanism configured in this way, since the piston can be moved with a force greater than the operating force applied by the user to the intersection point via the pressing part, the object to be discharged can be discharged from the container with a smaller force. Further, the transmission mechanism can be made gradually smoother by linking the sliding movement of the fixed-end link and the driving-end link with the increase in the link angle with the intersection point as the fulcrum. Therefore, the discharging device can gradually lighten the operating feeling of the pressing part in conjunction with the increase in the discharge amount, and thus can improve the operability of the pressing part during the discharging operation.

[0016] Also, the transmission mechanism can be configured such that when the user operates the pressing part, the driving-end link slides so that the fixed end and the movable end approach each other with a force greater than the force applied by the user to the pressing part. With such a transmission mechanism configured in this way, since the piston can be moved with a force greater than the operating force applied by the user to the pressing part, the object to be discharged can be discharged from the container with a smaller force. Further, the transmission mechanism can be made gradually smoother by linking the sliding movement of the driving-end link with the decrease in the link angle. Therefore, the discharging device can gradually lighten the operating feeling of the pressing part in conjunction with the increase in the discharge amount, and thus can improve the operability of the pressing part during the discharging operation.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

MODE FOR CARRYING OUT THE INVENTION

[0018] <First Embodiment> Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and duplicate descriptions are omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation and may be different from the actual ratios.

[0019] FIG. 1 is a front view showing the overall configuration of the ejector 10 according to the first embodiment. FIGS. 2 to 8 are diagrams for explaining the configuration and operation example of the ejection device 100 provided in the ejector 10 according to the first embodiment. FIGS. 9 and 10 are partial cross-sectional views schematically showing the internal structure of the ejection device 100.

[0020] The configuration, operation effects, etc. of the ejection device 100 will be described through the ejector 10 of the present embodiment. The arrows Z1-Z2 attached to each figure indicate the height direction (vertical direction) of the ejector 10, the arrows Y1-Y2 indicate the width direction (front-rear direction) of the ejector 10, and the arrows X1-X2 indicate the depth direction of the ejector 10. Note that the definitions of each direction for the ejector 10 are the same for each part of the ejection device 100.

[0021] (Ejector 10) FIG. 1 shows the ejector 10 according to the first embodiment of the present invention. The ejector 10 has a container 500 that holds a predetermined ejection target D, and an ejection device 100 that is detachable from the container 500.

[0022] The ejector 10 can eject the object D to be ejected held inside the container 500 to the outside when the user operates the pressing part 220 described later.

[0023] When the user performs an operation to eject the object D to the outside, the user grips the pressing part 220 and the detachable part 360 with a finger or the like and rotates (pushes down) the pressing part 220. When the user operates the pressing part 220, a predetermined amount of the object D to be ejected corresponding to the operation amount of the user is ejected to the outside of the container 500. Further, when the user weakens the operating force applied to the pressing part 220, the pressing part 220 returns to its original position (hereinafter referred to as the "standby position") by a spring part 260 described later.

[0024] (Container 500) The container 500 holds the object D to be ejected inside. Examples of the object D to be ejected used in the present embodiment include a known liquid for cleaning (liquid detergent) and an alcohol cleaning liquid. However, the specific type and properties of the object D to be ejected (for example, liquid, mixed fluid of liquid and gas, mixed fluid of liquid and solid, gel-like substance, etc.) are not particularly limited as long as it can be ejected to the outside of the container 500 along with the movement of the piston 210 interlocked with the operation of the pressing part 220 described later.

[0025] Near the upper end of the container 500, a mouth-neck part 511 is provided. The detachable part 360 provided in the ejecting tool 100 can be detachably connected to the mouth-neck part 511. The mechanism for connecting the mouth-neck part 511 and the detachable part 360 is not particularly limited. For example, a first screw part (male screw part or female screw part) provided on the outer surface of the mouth-neck part 511 and a second screw part (female screw part or male screw part) provided on the inner peripheral surface of the detachable part 360 and configured to be screwable with the first screw part, or a fitting type structure in which one is fitted and fixed to the other can be adopted.

[0026] The material, volume, etc. of the container 500 can be arbitrarily set according to the type of the object D to be ejected accommodated inside the container 500, the use of the ejector 10, and the like.

[0027] Dispensing device 100 The dispensing device 100 is a device for enabling an operation of discharging a discharge object D held inside the container 500 to the outside.

[0028] As shown in FIGS. 2 to 5, the dispensing device 100 includes a piston driving unit 200 and a dispenser main body 300. FIGS. 4 and 5 are schematic diagrams in which each component is simplified to explain the operating principle of the dispensing device 100.

[0029] The piston driving unit 200 is a mechanical structural part for sucking up and discharging the discharge object D held inside the container 500 by operating the piston 210 in conjunction with the operation of the pressing part 220 by the user.

[0030] The dispenser main body 300 is a member (housing) in which mechanisms necessary for various operations of the piston driving unit 200 and the dispensing device 100 are assembled inside.

[0031] As shown in FIGS. 2, 3, 4, 5, and 8, the piston driving unit 200 includes a piston 210 configured to be reciprocally movable between an initial position P1 and a forward limit position P2 located on a straight line of the initial position P1, a pressing part 220 to which the user applies an operating force, a transmission mechanism 230 that transmits the operating force applied to the pressing part 220 to the piston 210 and converts the operation of the pressing part 220 when the operating force is applied into a linear motion of the piston 210, and a spring part 260 that returns the piston 210 to the initial position P1 when the application of the operating force to the pressing part 220 is released.

[0032] The above-mentioned "initial position P1" (see FIGS. 2 and 4) is the position where the piston 210 is arranged in a state where no operating force is applied to the pressing part 220 and the spring part 260 has returned to the origin. Also, the above-mentioned "forward limit position P2" (FIGS. 3 and 4) is the position where the piston 210 has advanced so as to be most separated from the initial position P1.

[0033] In the present embodiment, the forward limit position P2 is set based on the operating distance until the second pivot shaft 275 abuts against the upper end 292a of the link guide groove 292 formed in the slide guide portion 290 described later (see FIG. 7).

[0034] The moving direction (the direction of linear motion) of the piston 210 interlocked with the operation of the pressing portion 220 is, for example, the front-rear direction of the discharging device 100 (the direction of the arrows Y1 - Y2 shown in FIGS. 4 and 5). Note that the moving direction of the piston 210 can be arbitrarily changed according to the configuration of the discharging device. For example, in the second embodiment described later, the moving direction of the piston 210 is the vertical direction of the discharging device 100A (the direction of the arrows Z1 - Z2 shown in FIGS. 13 and 14).

[0035] The spring portion 260 arranges the pressing portion 220 at the standby position so that the piston 210 is arranged at the initial position P1 in a state where no operating force is applied to the pressing portion 220. The states shown in FIGS. 1, 2, and 4 are those where no operating force is applied to the pressing portion 220. That is, the pressing portion 220 is held at the standby position by the elastic force of the spring portion 260. As described later, the pressing portion 220 is connected to the piston 210 via a plurality of members such as the transmission mechanism 230. Therefore, in a state where no operating force is applied to the pressing portion 220 and the pressing portion 220 is held at the standby position, the piston 210 is held at the initial position P1.

[0036] FIGS. 3 and 5 show a state where an operating force is applied to the pressing portion 220 and the piston 210 has moved to the forward limit position P2 in conjunction with the operation of the pressing portion 220.

[0037] When the piston 210 moves toward the forward limit position P2 in conjunction with the operation applied to the pressing portion 220, the movement of the discharge target D held in the cylinder 310 is driven as will be described later, and the discharge target D is discharged from the discharge port 321 provided in the discharger body 300. The discharge amount of the discharge target D corresponds to the movement amount of the piston 210 toward the forward limit position P2. Further, the discharge of the discharge target D starts immediately after the forward movement of the piston 210 starts and stops when the piston 210 reaches the forward limit position P2.

[0038] After the piston 210 reaches the forward limit position P2, when the user weakens the operating force applied to the pressing portion 220 or completely releases the operation of the pressing portion 220, the spring portion 260 moves the piston 210 back to the initial position P1. At this time, the discharge target D held in the interior 510 of the container 500 is sucked into the cylinder 310. Further, in conjunction with the movement of the piston 210, the pressing portion 220 moves back to the standby position, preparing for the next discharge. Therefore, the user can repeatedly discharge and stop the discharge of the discharge target D by repeating the operations of gripping and releasing the pressing portion 220.

[0039] As shown in FIGS. 2, 3, 4, 5, 9, and 10, the discharger body 300 includes a cylinder 310 that holds the piston 210 and sucks up the discharge target D held in the interior 510 of the container 500 in conjunction with the linear movement of the piston 210, a discharge port 321 for discharging the discharge target D sucked up through the cylinder 310 to the outside, a communication passage 330 that communicates the discharge port 321 with the interior 510 of the container 500, a check valve member 350 that controls the fluid communication between the discharge port 321 and the interior 510 of the container 500 in conjunction with the linear movement of the piston 210, and a flow path partitioning member (cylindrical member) 370 having an internal flow path 371 for sending the sucked-up discharge target D to the communication passage 330.

[0040] As shown in FIGS. 4, 9, and 10, the cylinder 310 has a piston guide 311 that holds the piston 210 in a linearly movable state. The cylinder 310 sucks up the object D to be discharged from the interior 510 of the container 500 in conjunction with the movement of the piston 210 held by the piston guide 311. Note that the discharging and sucking operations of the object D by the piston 210 and the cylinder 310 will be described later.

[0041] The discharge port 321 communicates with a communication passage 330 provided inside the discharger main body 300. When discharging the object D held inside the container 500, the discharging instrument 100 moves the object D to the discharge port 321 via a dip tube 340, an internal flow path 371 of a flow path partitioning member 370, and the communication passage 330, which will be described later. Note that the discharger main body 300 may include a lid member for opening and closing the discharge port 321.

[0042] The check valve member 350 is disposed in the internal flow path 371 of the flow path partitioning member 370. In the present embodiment, the check valve member 350 has a discharge valve 351 and a suction valve 352 that partially open and close the internal flow path 371 in conjunction with the operation of the piston 210.

[0043] As shown in FIGS. 2, 3, 4, and 5, the transmission mechanism 230 has a fixed-end link 240 and a drive-end link 250.

[0044] The fixed-end link 240 includes a fixed end 241 rotatably held at a predetermined fixed position of the discharger main body 300, and a first connection end 242 located at an end opposite to the fixed end 241.

[0045] The drive-end link 250 includes a second connection end 252 rotatably connected to the first connection end 242 of the fixed-end link 240 via a second rotation shaft 275, and a movable end 253 located at an end opposite to the second connection end 252 and configured to move the piston 210 toward the forward limit position P2 in conjunction with the rotation of the second connection end 252 when an operating force is applied to the pressing portion 220.

[0046] As shown in FIGS. 2 and 3, the movable end 253 of the drive end link 250 is connected to the piston 210 via the piston drive link 280.

[0047] As shown in FIGS. 2 and 3, the fixed end 241 of the fixed end link 240 is located on the extension of the straight-line motion trajectory of the piston 210. The above-mentioned "on the extension of the straight-line motion trajectory of the piston 210" is synonymous with "on the projection plane of the piston 210". That is, the fixed end 241 is positioned on the extension of the arrow Y1 - Y2 shown in FIGS. 4 and 5 as viewed from the piston 210.

[0048] As will be described later, the fixed end link 240 and the drive end link 250 are configured to increase the link angle θ3 formed between the fixed end 241 and the drive end link 250 as the piston 210 moves from the initial position P1 to the forward limit position P2.

[0049] As shown in FIGS. 2 and 3, the pressing part 220 is attached to the ejector body 300 in a rotatable state.

[0050] As shown in FIGS. 2 and 3, the ejector body 300 includes a tip part 320 having a discharge port 321 and a base part 325 disposed on the rear side (arrow Y2 side) of the tip part 320.

[0051] Inside the base part 325, a part of the transmission mechanism 230, the flow path partitioning member 370 to be described later, etc. are accommodated.

[0052] The base part 325 includes a spring part 260. The spring part 260 is composed of an elastic member with a shape gently curved toward the rear side (arrow Y2 side).

[0053] As shown in FIG. 8, the spring part 260 includes a spring protrusion 261 that is slidably inserted into a spring receiver 282 provided on the piston drive link 280.

[0054] In FIGS. 2 to 5, a rectangular window portion 280a is shown in the piston drive link 280, but this is provided for convenience of illustrating a structure installed inside the piston drive link 280 and does not actually exist in the embodiment.

[0055] The piston drive link 280 is connected to the spring portion 260 with the spring protrusion 261 inserted into the spring receiver 282. In a state where no operating force is applied to the pressing portion 220, the spring portion 260 holds the pressing portion 220 at the standby position as shown in FIG. 3. When the user grips the pressing portion 220 with a finger or the like and rotates the pressing portion 220, the spring portion 260 moves rearward (arrow Y2 side) in conjunction with the operation of the pressing portion 220. When the user releases the operation of the pressing portion 220, the spring portion 260 moves so as to return to the origin position by the elastic force. The pressing portion 220 is returned to the standby position as the spring portion 260 returns to the origin position.

[0056] Note that the spring portion 260 is constituted by a part of the ejector body 300 (a resin molded portion integrally formed with the ejector body 300), but may be constituted by, for example, an elastically deformable spring member or the like that is a separate member from the ejector body 300.

[0057] As shown in FIGS. 2 and 3, the transmission mechanism 230 further includes a transmission link 270 and a piston drive link 280.

[0058] The transmission link 270 includes a third connection end 273 that is rotatably connected to the first connection end 242 and the second connection end 252. The transmission link 270 is configured to change the link angle θ3 in conjunction with the operation of the pressing portion 220.

[0059] As shown in FIGS. 2 and 3, the transmission link 270 has a first link 271 and a second link 272.

[0060] The first link 271 and the second link 272 are rotatably connected to each other via a first rotation axis 274.

[0061] The end portion of the first link 271 located on the side opposite to the first pivot axis 274 is rotatably fitted into a rotation groove 325a provided in the base portion 325 of the ejector body 300.

[0062] A third connection end 273 is arranged at the end portion of the second link 272 located on the side opposite to the first pivot axis 274.

[0063] As shown in FIGS. 2 and 3, the piston drive link 280 is configured to connect the movable end 253 and the piston 210 and transmit the movement of the movable end 253 to the piston 210.

[0064] The movable end 253 is locked to the edge portion of the piston drive link 280 located on the rear end side of the ejector body 300. On the other hand, the end portion of the piston drive link 280 located on the front end side of the ejector body 300 is connected to the piston 210. That is, the drive end link 250 provided in the piston 210 and the transmission link 270 is indirectly connected via the piston drive link 280.

[0065] Near the rear where the piston drive link 280 is arranged, a slide guide portion 290 for guiding the movement of the movable end 253 and the second pivot axis 275 is arranged.

[0066] As shown in FIG. 7, the slide guide portion 290 has a guide groove 291 extending parallel to the direction in which the piston 210 moves linearly, and a link guide groove 292 extending obliquely and curved in the vertical direction of the ejector body 300.

[0067] The movable end 253 is arranged in the guide groove 291. The movable end 253 can move linearly along the guide groove 291.

[0068] The second rotating shaft 275 is arranged in the link guide groove 292. The second rotating shaft 275 can move along an arc-shaped locus formed by the link guide groove 292 along the vertical direction of the ejector body 300. The forward limit position P2 of the piston 210 is set according to the position where the second rotating shaft 275 abuts against the upper end portion 292a of the link guide groove 292.

[0069] FIG. 6 shows a part of the inside of the ejector body 300 in a plan view seen from above.

[0070] As shown in FIG. 6, two sets of the transmission link 270, the fixed-end link 240, and the drive-end link 250 are arranged at symmetric positions with respect to the extending direction of the base portion 325 (the same direction as the axial direction of the piston 210). Thereby, the ejecting device 100 can exhibit the following effects.

[0071] For example, when the piston 210 is configured to move in an oblique direction (a direction inclined toward the vertical direction indicated by the arrows Z1-Z2), a gap may be generated between the piston 210 and the cylinder 310, leading to liquid leakage or ejection failure. On the other hand, flow paths or drive shafts for flowing the ejection target D are often provided on the axes of the piston 210 and the cylinder 310 (piston guide 311). Therefore, by symmetrically arranging drive mechanisms such as the transmission link 270, the fixed-end link 240, and the drive-end link 250 with respect to the axial direction of the piston 210 (the direction in which the piston 210 moves linearly), it is possible to prevent an oblique force from being applied to the piston 210, thereby preventing problems such as liquid leakage.

[0072] As shown in FIG. 6, near the rear end of the base portion 325, a connecting fitting portion 326 fitted into a connecting groove 293 provided in the slide guide portion 290 is provided. The slide guide portion 290 is connected to the ejector body 300 via the connecting groove 293 and the connecting fitting portion 326. In the present embodiment, the connecting fitting portion 326 is constituted by a part of the outer wall of the flow path partitioning member 370 (see FIG. 9).

[0073] Next, the operation of the piston 210 by the transmission mechanism 230 and the increase and decrease of the link angle θ3 will be described.

[0074] Figures 2 and 4 show the state before the user applies an operating force to the pressing portion 220 (hereinafter referred to as the "initial state").

[0075] When the user grips the pressing portion 220 with a finger and performs an operation of grasping and pushing down the pressing portion 220 (the operation indicated by the arrow a1 shown in Fig. 3) from the initial state shown in Figs. 2 and 4, the pressing portion 220 rotates downward.

[0076] When the pressing portion 220 rotates downward, the operation of the pressing portion 220 is transmitted to the third connection end 273 via the transmission link 270 (the first link 271 and the second link 272). Further, during the process of being transmitted to the transmission link 270, the operation of the pressing portion 220 is converted into a lifting operation (the operation indicated by the arrow a2 in Fig. 3) of the second link 272 with the first rotation axis 274 as a base point.

[0077] When the lifting operation of the second link 272 is driven, the vicinity of the rear end portion of the fixed-end link 240 and the vicinity of the connection end portion of the drive-end link 250 operate to lift with the first connection end 242 and the second connection end 252 rotatably connected at the same position as the third connection end 273 as base points (the operation indicated by the arrow a3 in Fig. 3).

[0078] As shown in Fig. 5, when the vicinity of the rear end portion of the fixed-end link 240 and the vicinity of the connection end portion of the drive-end link 250 operate to lift, the fixed end 241 holds its position while the movable end 253 moves rearward. When the movable end 253 moves rearward, the piston 210 connected to the movable end 253 via the piston drive link 280 moves rearward in conjunction with the movement of the movable end 253.

[0079] In the process of the transmission mechanism 230 transmitting the operating force applied to the pressing portion 220 to the piston 210 as described above, the link angle θ3 formed between the fixed-end link 240 and the drive-end link 250 changes as follows.

[0080] As shown in FIGS. 4 and 5, the link angle θ3 can be defined as the angle formed by a straight line H1 along the extending direction of the fixed-end link 240 (the straight line connecting the fixed end 241 and the first connection end 242) and a straight line H2 along the extending direction of the drive-end link 250 (the straight line connecting the movable end 253 and the second connection end 252).

[0081] Also, the link angle θ3 extends in a direction orthogonal to the direction in which the piston 210 moves linearly (the direction indicated by the arrow Y1 - Y2), and is the sum of a first angle θ1 formed between a straight line H3 passing through the rotation center positions of the first connection end 242 and the second connection end 252 (the intersection of the first connection end 242 and the second connection end 252) and the straight line H1, and a second angle θ2 formed between the straight line H3 and the straight line H2.

[0082] In this embodiment, the link angle θ3 changes continuously so as to increase as the piston 210 moves from the initial position P1 to the forward limit position P2.

[0083] By operating so as to push down and rotate the pressing portion 220 in the standby position, and accordingly, immediately after the piston 210 starts to move from the initial position P1, the operating force applied to the pressing portion 220 is mainly converted via the transmission link 270 into a force that lifts the first connection end 242 and the second connection end 252 upward. The transmission mechanism 230 moves the movable end 253 in a direction away from the fixed end 241 in conjunction with the operation of lifting the first connection end 242 and the second connection end 252. The link angle θ3 gradually increases as the movable end 253 moves in a direction away from the fixed end 241.

[0084] In the process in which the link angle θ3 increases in conjunction with the operating force applied to the pressing portion 220 as described above, the operating feeling felt by the user changes as follows.

[0085] In the process in which the link angle θ3 increases in conjunction with the operating force applied to the pressing portion 220 as described above, the operating feeling felt by the user changes as follows.

[0086] In a state where no operating force is applied to the pressing part 220, the sum of the driving force required to pressurize and discharge the object D to be discharged, the sliding resistance between the piston 210 and the cylinder 310, and the force for deforming the spring part 260 is applied from the movable end 253 side toward the fixed end 241 via the piston drive link 280.

[0087] In the above state, a straight line along the moving direction of the movable end 253 (a straight line along the extending direction of the guide groove 291 and a straight line along the moving direction of the piston 210) is defined as H4 (see FIGS. 4, 5, and 7). As shown in FIG. 4, when the pressing part 220 is in the standby position (when the piston 210 is in the initial position P1), the two connecting ends 242 and 252 are most deviated from the straight line H4, the fixed end link 240 and the driving end link 250 are most inclined with respect to the straight line H4, and the link angle θ3 is the smallest. At this time, the force for driving the piston 210 and the spring part 260 is converted into the force for most greatly separating the connecting ends 242 and 252 from the straight line H4, and the force required for operating the pressing part 220 also increases. When the user continues to apply an operating force to the pressing part 220 and the link angle θ3 gradually increases, the connecting ends 242 and 252 approach the straight line H4, the angles of the fixed end link 240 and the driving end link 250 with respect to the straight line H4 become smaller, and the link angle θ3 becomes larger. Accordingly, the ratio of the force for driving the piston 210 and the spring part 260 being converted into the force for separating the connecting ends 242 and 252 from the straight line H4 decreases, and the force required for operating the pressing part 220 also decreases accordingly. In a state where the fixed end 241, the connecting ends 242 and 252, and the movable end 253 are aligned in a straight line on the straight line H4 (a state where the link angle θ3 becomes 180 degrees), the movable end 253 is completely supported by the fixed end link 240 and the driving end link 250, the force for separating the connecting ends 242 and 252 from the straight line H4 becomes zero, and thereby the force for pushing back the pressing part 220 does not occur.

[0088] Therefore, the user will experience a lighter operating sensation (less load) when operating the pressing portion 220 in a state where the piston 210 is closer to the forward limit position P2 than in the initial stage when an operating force is applied to the pressing portion 220. Therefore, the user can operate the pressing portion 220 with a lighter operating sensation until the piston 210 is moved to the forward limit position P2.

[0089] In the present embodiment, it is preferable that the link angle θ3 is configured to increase to less than 180° as the piston 210 moves from the initial position P1 toward the forward limit position P2. That is, it is preferable that the link angle θ3 is configured to be less than 180° when the piston 210 reaches the forward limit position P2. This is for the following reasons.

[0090] When the link angle θ3 reaches 180° when the piston 210 reaches the forward limit position P2, all the forces applied to the movable end 253 are transmitted to the fixed end 241 as described above, and no force is generated to push down the second pivot shaft 275, and no force is generated to return the pressing portion 220 to the standby position. Therefore, it becomes difficult to automatically and smoothly return the pressing portion 220 to the standby position only by the restoring force of the spring portion 260. Therefore, it is preferable that the transmission mechanism 230 is configured such that the link angle θ3 is at most less than 180°.

[0091] Further, in the present embodiment, it is more preferable that the link angle θ3 is 120° or more when the piston 210 is located at the initial position P1 and 178° or less when the piston 210 is located at the forward limit position P2. This is for the following reasons.

[0092] As described above, the transmission mechanism 230 of the present embodiment is configured to reduce the operating force of the pressing portion 220 in conjunction with an increase in the link angle θ3. Specifically, in the process of transmitting the operating force applied to the pressing portion 220 to the piston 210, a part of the force for moving the piston 210 can be divided to the fixed end 241 side. Therefore, the work amount exceeding the work amount applied to the pressing portion 220 (the work amount obtained by multiplying the operating force applied to the pressing portion 220 by the distance by which the pressing portion 220 is moved (rotated), and the work amount when lifting the first connection end 242 and the second connection end 252) can be applied to the piston 210.

[0093] The transmission mechanism 230 composed of a plurality of link mechanisms including the fixed end link 240 and the drive end link 250 can theoretically exhibit a "force increasing effect" that increases the work amount applied to the pressing portion 220 up to twice when the link angle θ3 reaches 150°. Hereinafter, as the link angle θ3 increases, a force increasing effect can be exhibited that is 3 times when the link angle θ3 is 160°, 5 times when the link angle θ3 is 170°, and 30 times when the link angle θ3 is 178°. On the other hand, when the link angle θ3 is 120°, no force increasing effect occurs, and the piston 210 can be moved with substantially the same work amount as the work amount applied to the pressing portion 220.

[0094] In the initial stage of applying an operating force to the pressing portion 220 in the standby position of the discharging device 100, if the operating feeling of the pressing portion 220 is too light, the user may accidentally or excessively push down the pressing portion 220, and as a result, there is a risk of unexpectedly or excessively discharging the discharge object D at the start of discharge. Immediately after the user starts operating the pressing portion 220, in order to obtain a predetermined operating feeling, when the pressing portion 220 is in the standby position (when the piston 210 is in the initial position P1), the link angle θ3 is more preferably 90° or more and 130° or less, and in this embodiment, it is, for example, 105°. When the link angle θ3 is set to 90° or more and 130° or less as described above, the force increasing effect is approximately 0.7 times to 1.2 times.

[0095] In addition, as described above, the closer the link angle θ3 approaches 180° when the piston 210 reaches the forward limit position P2, the greater the force required to restore the pressing portion 220 to the standby position. In order to enable the ejection device 100 to automatically restore the pressing portion 220 to the standby position by the spring portion 260, the upper limit value of the link angle θ3 is preferably 178° or less, and in this embodiment, it is, for example, 170°.

[0096] As described above, in this embodiment, the link angle θ3 can be defined as the sum of the first angle θ1 formed by the straight line H3 and the straight line H1 along the fixed-end link 240 and the second angle θ2 formed by the straight line H3 and the straight line H2 along the movable-end 253 link. As shown in FIGS. 4 and 5, the fixed-end link 240 and the drive-end link 250 extend substantially symmetrically in the front-rear direction (the direction of the arrow Y1 - Y2) with respect to the straight line H1. Therefore, when the link angle θ3 takes the above-described numerical values, each of the first angle θ1 and the second angle θ2 has a magnitude of θ3×1 / 2.

[0097] With reference to FIGS. 9 and 10, the operations of the piston 210 and the cylinder 310 will be described. Here, the configuration examples of the respective members will be described in a simplified manner. Note that the piston 210 and the cylinder 310 used in the ejection device 100 are not limited in their specific structures as long as they can suck up the ejection target D using the linear motion of the piston 210 and eject it from the ejection port 321.

[0098] As shown in FIG. 9, a flow path partitioning member 370 is disposed inside the ejector body 300.

[0099] An internal flow path 371 is provided inside the flow path partitioning member 370. A dip tube 340 having a flow path 341 through which the ejection target D can flow is connected to the flow path partitioning member 370. A certain range on the lower end side of the dip tube 340 is inserted into the interior 510 of the container 500.

[0100] Inside the flow path partitioning member 370, a discharge valve 351 and a suction valve 352 are arranged. Inside the cylinder 310, a space portion 313 for temporarily holding the discharge object D is provided. The piston 210 is held by a piston guide 311 provided in the cylinder 310.

[0101] The space portion 313 of the cylinder 310 is in fluid communication with the space between the discharge valve 351 and the suction valve 352 through a through hole 312 formed in the cylinder 310 and a through hole 373 formed in the flow path partitioning member 370.

[0102] As shown in FIG. 9, when the pressing portion 220 is in the standby state, the space portion 313 is filled with the discharge object D. In this state, as shown in FIG. 10, when the pressing portion 220 is operated and the piston 210 moves along the piston guide 311, the discharge object D filled in the space portion 313 flows into the internal flow path 371 of the flow path partitioning member 370 through the through holes 312 and 373. When the discharge object D flows between the discharge valve 351 and the suction valve 352, the suction valve 352 is pushed down to close the valve and the discharge valve 351 is pushed up to open the valve. Thereby, the discharge object D can be sent into the communication path 330 in fluid communication with the internal flow path 371, and the discharge object D can be discharged from the discharge port 321. In addition, a pressure accumulation chamber for applying a predetermined pressure to the discharge object D when the discharge object D is discharged from the discharge port 321 can be provided at the tip portion 320, the base portion 325, etc. of the discharger main body 300.

[0103] After the discharge target D is discharged, when the operation of the pressing portion 220 is released, the piston 210 moves forward by the restoring force of the spring portion 260, and the pressing portion 220 returns to the standby position. When the piston 210 moves forward, the pressure inside the space portion 313 becomes negative pressure, so the suction valve 352 opens, and the discharge target D held inside the container 500 is sucked up through the flow path 341 of the dip tube 340 and the internal flow path 371 of the flow path partitioning member 370. The sucked-up discharge target D flows into the space portion 313 through the respective through holes 312 and 373. Thereby, with the pressing portion 220 returned to the standby position, the preparation for the next discharge operation is completed.

[0104] <Second Embodiment> Next, with reference to FIGS. 11 to 20, the discharge device 100A according to the second embodiment will be described.

[0105] FIGS. 11 and 12 are front views showing the states before and after operating the pressing portion 220 of the discharge device 100A according to the second embodiment. FIG. 13 is a partial cross-sectional view of the discharge device 100A corresponding to FIG. 11, and FIG. 14 is a partial cross-sectional view of the discharge device 100A corresponding to FIG. 12. FIGS. 15 and 16 are perspective cross-sectional views showing the states inside the cylinder 310 before and after performing the discharge operation. FIGS. 17 and 18 are diagrams for simply explaining the operation of the transmission mechanism 230 according to the second embodiment. FIGS. 19 and 20 are diagrams for explaining the link angle θ3 and the reference angle according to the second embodiment.

[0106] In the description of the second embodiment, the description of the parts common to the first embodiment will be omitted, and only the parts characteristic of the second embodiment will be described. Also, the same members as those in the first embodiment described above will be denoted by the same reference numerals and described, and redundant descriptions will be omitted.

[0107] The discharging device 100A according to the second embodiment is configured such that the way the link angle θ3 changes when the piston 210 operates is different from that of the discharging device 100 according to the first embodiment. Specifically, the discharging device 100A according to the second embodiment is configured to decrease the link angle θ3 while the piston 210 moves from the initial position P1 to the forward limit position P2.

[0108] As shown in FIGS. 11 to 16, the discharging device 100A is configured as a pump-type device including a pressing part 220 having a function as a discharging lever.

[0109] As shown in FIGS. 11 and 12, by pushing down the pressing part 220 in the standby position, the discharging device 100A can discharge the object D to be discharged (see FIG. 1) held in the interior 510 of the container 500 from the discharge port 321. In each figure, the operation of pushing down the pressing part 220 is indicated by an arrow a4.

[0110] As shown in FIGS. 13 and 14, the pressing part 220 is integrally formed with the fixed-end link 240.

[0111] The ejector body 300 has a fitting part 315 in which the fixed end 241 of the fixed-end link 240 is rotatably fitted.

[0112] The pressing part 220 and the fixed-end link 240 are attached to the ejector body 300 in a rotatable state via the fitting part 315.

[0113] The fixed-end link 240 has a recess 245 configured to accommodate a part of the drive-end link 250 when an operation of pushing down the pressing part 220 is performed. By having the recess 245, the fixed-end link 240 prevents interference between the fixed-end link 240 and the drive-end link 250 when the pressing part 220 is pushed down as shown in FIG. 14.

[0114] The transmission mechanism 230 has a connecting part 700 connected to the piston 210. The connecting part 700 extends on the extension of the linear motion of the piston 210.

[0115] The movable end 253 of the drive end link 250 is connected to the piston 210 via the connecting portion 700 and is configured to be movable together with the connecting portion 700 in accordance with the operation of the pressing portion 220.

[0116] The drive end link 250 has a recess 255 configured to accommodate a part of the connecting portion 700 when an operation of pushing down the pressing portion 220 is performed. By having the recess 255, the drive end link 250 prevents interference between the connecting portion 700 and the drive end link 250 when the pressing portion 220 is pushed down as shown in FIG. 14.

[0117] A stopper 610 for restricting the pushing-down position of the pressing portion 220 is disposed on the upper surface of the gripping portion 600 that is gripped when the user operates the pressing portion 220.

[0118] Inside the connecting portion 700, a flow path 720 through which the discharge target D can flow is provided. Near the lower end portion of the connecting portion 700, a tube connection portion 380 to which the dip tube 340 can be connected is disposed.

[0119] At the upper end portion of the connecting portion 700, a spring holding portion 710 for holding the spring portion 260 is provided. The spring portion 260 can be configured, for example, as a metal coil spring that can insert the spring holding portion 710 therein.

[0120] The spring portion 260 holds the pressing portion 220 at the standby position (the positions shown in FIGS. 13 and 15) when no operating force is applied to the pressing portion 220. When an operating force applied to the pressing portion 220 is applied, the spring portion 260 extends in the extending direction (vertical direction) of the spring holding portion 710 and returns the pressing portion 220 to the standby position.

[0121] The spring holding portion 710 has a notch portion 711 for allowing the discharge target D flowing through the flow path 720 formed inside the connecting portion 700 to flow out into the cylinder 310.

[0122] As shown in FIGS. 14 and 16, in a state where the pressing portion 220 is pushed up, the discharge object D held in the cylinder 310 passes through the through hole 331 provided on the top surface of the cylinder 310, lifts the discharge valve 351, flows into the communication passage 330, and can then be discharged to the outside through the discharge port 321.

[0123] A piston 210 is provided at a predetermined position on the lower end side of the spring holding portion 710 in the connecting portion 700.

[0124] As shown in FIGS. 14 and 16, after operating the pressing portion 220 to discharge the discharge object D and then returning the pressing portion 220 to the standby position, the inside of the cylinder 310 where the piston 210 is disposed becomes negative pressure. When the inside of the cylinder 310 becomes negative pressure, the discharge object D held in the interior 510 of the container 500 is sucked up through the dip tube 340, the flow path 720 of the connecting portion 700, and the suction valve 352, and flows into the cylinder 310 through the notch portion 711. Thereby, in a state where the pressing portion 220 has returned to the standby position, preparations for another discharge operation are completed. In this state, the communication passage 330 is blocked from fluid communication with the flow path 720 of the connecting portion 700 by the discharge valve 351.

[0125] Note that the drive mechanism of the pump that can be employed in the present embodiment is not limited in its specific configuration as long as it has a configuration capable of sucking up and discharging the discharge object D into the cylinder 310 by utilizing the linear motion of the piston 210.

[0126] Next, with reference to FIGS. 17 to 20, the link angle θ3 and the reference angle according to the second embodiment will be described.

[0127] Figures 17 and 18 schematically show the state of the transmission mechanism 230 before and after the piston 210 linearly moves from the initial position P1 to the forward limit position P2. Figures 19 and 20 schematically show the link angle θ3 defined in the present embodiment. Note that FIG. 19 shows the link angle θ3 when the piston 210 is located at the initial position P1, and FIG. 20 shows the link angle θ3 when the piston 210 reaches the forward limit position P2.

[0128] In the present embodiment, the link angle θ3 continuously decreases as the piston 210 moves from the initial position P1 toward the forward limit position P2.

[0129] As shown in FIGS. 19 and 20, in the process of the discharging device 100A moving toward the forward limit position P2 of the piston 210, while the position of the fixed end 241 does not change, the movable end 253 moves upward along the connecting portion 700. At this time, the rotation center position (the intersection of the first connecting end 242 and the second connecting end 252) moves closer to (is pushed down toward) the connecting portion 700. Further, the movable end 253 moves along the extending direction of the connecting portion 700 so as to approach the fixed end 241. Similar to the discharging device 100 according to the above-described embodiment, the discharging device 100A can also divide a part of the force for moving the piston 210 to the fixed end 241 side in the process of the operating force applied to the pressing portion 220 being transmitted to the piston 210. Therefore, a work amount exceeding the work amount applied to the pressing portion 220 can be applied to the piston 210, and the "force increasing effect" when operating the pressing portion 220 can be exerted.

[0130] In the initial stage when the application of the operating force to the pressing part 220 is started, the two connecting ends 242 and 252 are most deviated from the straight line H4, the fixed-end link 240 and the driving-end link 250 are most inclined with respect to the straight line H4, and the link angle θ3 is maximized. At this time, the force for driving the piston 210 and the spring part 260 is converted into the force for most greatly separating the connecting ends 242 and 252 from the straight line H4, and the force required for the operation of the pressing part 220 also increases. When the user continues to apply an operating force to the pressing part 220 and the link angle θ3 gradually decreases, the connecting ends 242 and 252 approach the straight line H4, and the angles of the fixed-end link 240 and the driving-end link 250 with respect to the straight line H4 (the angles between the respective straight lines H5, H6 and the straight line H4) become smaller. Along with this, the ratio at which the force for driving the piston 210 and the spring part 260 is converted into the force for separating the connecting ends 242 and 252 from the straight line H4 decreases, and the force required for the operation of the pressing part 220 also decreases accordingly. Therefore, similar to the discharging device 100 according to the first embodiment described above, in the discharging device 100A according to the second embodiment, as the piston 210 approaches the forward limit position P2, the operating feeling when pressing down the pressing part 220 becomes lighter.

[0131] The link angle θ3 of the discharging device 100A according to the second embodiment can be defined as the angle between the straight line H5 along the extending direction of the fixed-end link 240 and the straight line H6 along the extending direction of the driving-end link 250, similar to the link angle θ3 of the discharging device 100 according to the first embodiment.

[0132] In the discharging device 100A according to the second embodiment, as a configuration for exerting the above-described "force increasing action", it can be defined based on a predetermined "reference angle" instead of the link angle θ3. With reference to FIGS. 19 and 20, the reference angle will be described.

[0133] Let the straight line along the moving direction of the movable end 253 (which is the straight line along the extending direction of the connecting portion 700 and also the straight line along the moving direction of the piston 210) be H4. Let the straight line that is orthogonal to the straight line H4 and passes through the rotation center positions of the first connecting end 242 and the second connecting end 252 (the intersection point of the first connecting end 242 and the second connecting end 252) (hereinafter referred to as the "reference straight line") be H7. Let the angle formed by the straight line H6 and the reference straight line H7 be the driving end link angle θ4, and let the angle formed by the straight line H5 and the reference straight line H7 be the fixed end link angle θ5. The reference angle is defined as the sum of the driving end link angle θ4 and the fixed end link angle θ5.

[0134] As shown in FIG. 19, in a state where no operating force is applied to the pressing portion 220, the fixed end link angle θ5 can be, for example, 60°. Also, as shown in FIG. 20, in a state where the pressing portion 220 is pushed down until it contacts the stopper 610, the fixed end link angle θ5 can be, for example, 87°.

[0135] As shown in FIG. 19, in a state where no operating force is applied to the pressing portion 220, the driving end link angle θ4 can be, for example, 33°. Also, as shown in FIG. 20, in a state where the pressing portion 220 is pushed down until it contacts the stopper 610, the driving end link angle θ4 can be, for example, 85°.

[0136] In the process where the fixed end link angle θ5 and the driving end link angle θ4 change as described above, the reference angle defined as the sum of the driving end link angle θ4 and the fixed end link angle θ5 can be set to change, for example, between 93° and 172°. Note that the reference angle is preferably 90° or more when the piston 210 is at the initial position P1, and preferably 175° or less when the piston 210 is at the forward limit position P2.

[0137] While the reference angle changes within the above range, the "force amplification effect" obtained when operating the pressing portion 220 theoretically changes from 0.5 times to 8.5 times. As a result, even when the piston 210 approaches the forward limit position P2, the discharge device 100A can suitably reduce the operating force when operating the pressing portion 220.

[0138] The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

[0139] For example, the internal structure of the discharge device and the drive mechanism for driving the discharge described in each embodiment can be arbitrarily changed as long as they are configured to be able to discharge the discharge target in conjunction with the operation of the pressing portion. Also, the arrangement and shape of the members described in the specification can be arbitrarily changed as long as the effects of the present invention are not impaired.

Explanation of Reference Numerals

[0140] 10 Syringe 100 Discharge device 100A Discharge device 200 Piston drive unit 210 Piston 220 Pressing portion 230 Transmission mechanism 240 Fixed-end link 241 Fixed end 242 First connection end 250 Drive-end link 252 Second connection end 253 Movable end 260 Spring portion 270 Transmission link 271 First link 272 Second link 273 Third connection end 280 Piston drive link 290 Slide guide portion 300 Syringe body 310 Cylinder 311 Piston guide 321 Discharge port 330 Connecting passage 340 Dip tube 350 Check valve member 500 Container 700 Connecting part D Object to be discharged P1 Initial position of piston P2 Forward limit position of piston θ1 First angle θ2 Second angle θ3 Link angle θ4 Driving end link angle θ5 Fixed end link angle H7 Reference straight line

Claims

【Claim 1】 A discharging device configured to be detachable from a container that holds a discharge target, a piston configured to reciprocate between an initial position and a forward limit position located on a straight line of the initial position, a pressing part to which a user applies an operating force, a transmission mechanism that transmits the operating force to the piston and converts the movement of the pressing part when the operating force is applied into a linear motion of the piston, a spring part that returns the piston to the initial position when the application of the operating force to the pressing part is released, and a piston driving part including the spring part, a cylinder that holds the piston and sucks up and discharges the discharge target held inside the container in conjunction with the linear motion of the piston, a discharge port that discharges the discharge target sucked up through the cylinder to the outside, a communication passage that communicates the discharge port with the inside of the container, and a discharge device main body including a check valve member that controls fluid communication between the discharge port and the inside of the container in conjunction with the linear motion of the piston. The transmission mechanism is a fixed-end link including a fixed end rotatably held at a predetermined fixed position of the discharge device main body and a first connection end located at an end opposite to the fixed end, a second connection end rotatably connected to the first connection end of the fixed-end link, and a movable end located at an end opposite to the second connection end and configured to move the piston toward the forward limit position in conjunction with the rotation of the second connection end when the operating force is applied to the pressing part, and a driving-end link including the movable end. The fixed end of the fixed-end link is located on an extension of the orbit of the linear motion of the piston, The fixed-end link and the driving-end link are configured to increase or decrease a link angle formed between the fixed-end link and the driving-end link as the piston moves from the initial position toward the forward limit position. A discharging device. Claim 2 The pressing part is attached to the ejector body in a rotatable state, The transmission mechanism, includes a third connecting end rotatably connected to the first connecting end and the second connecting end, and a transmission link that changes the link angle in conjunction with the operation of the pressing part, and a piston drive link that connects the movable end and the piston and transmits the movement of the movable end to the piston. The ejecting device according to claim 1, wherein the link angle increases to less than 180° as the piston moves from the initial position toward the forward limit position. Claim 3 The link angle is 120° or more when the piston is in the initial position, and 178° or less when the piston is in the forward limit position. The ejecting device according to claim 2. Claim 4 The pressing part is integrally formed with the fixed-end link, The ejector body has a fitting part into which the fixed end of the fixed-end link is rotatably fitted, The pressing part and the fixed-end link are attached to the ejector body in a rotatable state via the fitting part, The transmission mechanism has a connecting part that is connected to the piston and extends on the extension of the linear motion of the piston, The movable end of the drive-end link is connected to the piston via the connecting part and is configured to be movable together with the connecting part in accordance with the operation of the pressing part. The link angle decreases as the piston moves from the initial position toward the forward limit position. The ejecting device according to claim 1. Claim 5 When the sum of the driving end link angle formed by a reference straight line that is orthogonal to the straight line along the extending direction of the driving end link and the straight line along the moving direction of the movable end and passes through the rotation center positions of the first connecting end and the second connecting end, and the fixed end link angle formed by the straight line along the extending direction of the fixed end link and the reference straight line is defined as the reference angle, The discharging device according to claim 4, wherein the reference angle is 90° or more when the piston is at the initial position and 175° or less when the piston is at the forward limit position.

Images