JP2015203382A - hand pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand pump capable of preventing a spring-up of an operation lever.SOLUTION: A hand pump 1 includes: a body 11 equipped with a cylindrical cylinder 21 disposing an axis in a vertical direction, a suction casing 22 provided at a lower end portion of the cylinder 21, and a discharge casing 11b provided at an upper end portion of the cylinder 21; a piston member 12 equipped with a piston portion 42 formed on an inner peripheral surface of the cylinder 21 so as to reciprocate, and a piston rod 41; an operation lever 14 rotatably formed; a link mechanism portion 13 which couples the operation lever 14 and the piston rod 41, and converts rotations of the operation lever 14 into reciprocating movement of the piston rod 41; and a shock absorbing member 15 provided on the link mechanism portion 13, and which makes a resistance of movement of the link mechanism portion 13, when the piston member 12 moves to a lower dead point side.

Description

  The present invention relates to a hand pump used for supplying a liquid.

  Currently, hand pumps are used to supply water from household wells and water tanks. In such a hand pump, a technique is known in which a suction casing is provided at one end and a piston and two valve bodies are provided in a cylinder provided with a discharge casing at the other end.

  Further, a technique for providing a hand pump with a link mechanism for reciprocating the piston via a piston rod provided on the piston and an operation lever for driving the link mechanism is known (for example, see Patent Document 1). In the hand pump, a shaft sealing member is provided in the discharge casing, and the space between the piston rod and the discharge casing is sealed. Further, the hand pump is formed by a link mechanism so that the vertical rotation of the operation lever can be converted into the reciprocating motion of the piston rod in the vertical direction.

  In such a hand pump, a discharge chamber and a suction chamber are formed by a piston and a cylinder. The hand pump makes the volume of the suction chamber variable by reciprocating the piston, alternately opens and closes the two valve bodies, sucks water from the primary side of the suction chamber, and draws water from the suction chamber to the secondary side. This is a configuration in which water is pumped into the discharge chamber and water in the discharge chamber is discharged to the outside.

JP 2009-013876 A

  The hand pump using the bearing member described above has the following problems. That is, when air is present in the suction chamber when the hand pump is used, first, so-called self-priming is performed in which the operating lever is driven to reciprocate the piston so that the suction chamber is filled with water.

  At this time, when the piston moves in a direction in which the volume of the suction chamber increases, the air in the suction chamber expands and becomes negative pressure. For this reason, when the piston moves to the top dead center side, the piston moves to the bottom dead center side due to the negative pressure in the suction chamber, and the operation lever may rotate upward. In particular, as the moving speed of the piston increases, the pressure drop in the suction chamber increases. Therefore, when the operating lever is operated suddenly, there is a possibility that a so-called jumping occurs in which the operating lever suddenly rotates upward.

  Accordingly, an object of the present invention is to provide a hand pump capable of preventing the operation lever from jumping up.

  In order to solve the above problems and achieve the object, the hand pump of the present invention is configured as follows.

  According to one aspect of the present invention, a hand pump includes a cylindrical cylinder having an axial center disposed along a vertical direction, a suction casing provided at a lower end portion of the cylinder and constituting the cylinder and a suction chamber, and A main body having a discharge casing which is provided at an upper end portion of the cylinder and constituting the cylinder and a discharge chamber, and is formed to be reciprocable on an inner peripheral surface of the cylinder, and the suction chamber and the discharge are formed inside the cylinder. A piston section that is divided into chambers, a piston member that includes a piston rod connected to the piston section, an operation lever that is formed to be rotatable, and the operation lever and the piston rod, A link mechanism for converting the rotation of the piston rod into a reciprocating motion of the piston rod, and the piston member or the link mechanism, and the piston member Comprising a biasing member for biasing the dead point side.

  According to the present invention, it is possible to provide a hand pump capable of preventing the operation lever from jumping up.

Sectional drawing which shows the structure of the hand pump which concerns on the 1st Embodiment of this invention.

Hereinafter, the hand pump 1 which concerns on one Embodiment of this invention is demonstrated using FIG.
FIG. 1 is a cross-sectional view showing a configuration of a hand pump 1 according to an embodiment of the present invention.

  As shown in FIG. 1, the hand pump 1 includes a main body 11, a piston member 12 provided inside the main body 11 so as to be able to reciprocate, a link mechanism portion 13 connected to the piston member 12, and a link mechanism portion 13. Are provided with an operation lever 14 and a buffer member 15. The hand pump 1 has a pumping function by the reciprocating movement of the piston member 12 and a precipitation function by a first protrusion 25b and a second protrusion 26b described later.

  The main body 11 is arranged in a well or the like so that the lower end portion faces the water surface, for example. The main body 11 includes a cylindrical cylinder 21 whose axial center extends along the vertical direction, a suction casing 22 connected to the lower end portion of the cylinder 21, and a discharge casing 23 connected to the upper end portion of the cylinder 21. And a base 24 provided at the lower end of the suction casing 22.

  The main body 11 includes a first check valve 25 provided in the suction casing 22 and a cover member 26 provided between the cylinder 21 and the suction casing 22.

  The main body 11 has flange portions at opposite ends of the cylinder 21 and the suction casing 22 and opposite ends of the cylinder 21 and the discharge casing 23, and the flange portion with a seal member interposed therebetween is a bolt or the like. The cylinder 21, the suction casing 22, and the discharge casing 23 are integrally formed by fastening with the fastening member.

  In the main body 11, the suction chamber 11 a is formed in the cylinder 21 and the suction casing 22 together with the piston member 12. The main body 11, together with the piston member 12, has a discharge chamber 11 b formed in the cylinder 21 and in the discharge casing 23.

  The cylinder 21 is formed so that the piston member 12 can slide on the inner peripheral surface thereof. In the cylinder 21, the surface roughness of the inner peripheral surface and the circularity with respect to the axial center are formed with a predetermined accuracy. Here, the predetermined accuracy refers to water leakage between the piston member 12 and the cylinder 21 in the reciprocating motion of the piston member 12, resistance and interference between the piston member 12 and the cylinder 21 during the reciprocating motion, or the piston The accuracy is capable of preventing the pump function from being lowered due to damage of the member 12 and the like, and can be set as appropriate according to the performance of the hand pump 1.

  The cylinder 21 includes a first fixing portion 21a that supports the buffer member 15 on a part of the outer peripheral surface thereof. The 1st fixing | fixed part 21a is formed in plate shape, and is equipped with the 1st support shaft 21b in the part. The first support shaft 21b is formed so that the buffer member 15 can be detachably supported. The first support shaft 21b is, for example, a bolt attached to the first fixing portion 21a or a columnar shaft fixed to the first fixing portion 21a.

  The suction casing 22 is formed in a bowl shape, the upper end portion opens with the same inner diameter as the cylinder 21, and the lower end portion is provided with a suction port 22a. The suction casing 22 is formed so that the first check valve 25 can be disposed therein. Specifically, the suction casing 22 has a plurality of ribs 22b that can dispose the first check valve 25 on the inner surface around the suction port 22a and guide the movement of the first check valve 25, and the suction port. And a first valve seat 22c formed around 22a.

  The suction casing 22 constitutes a first valve chamber 22d of a first check valve 25 having a first valve seat 22c by a space between the ribs 22b. The suction port 22a has, for example, a threaded portion 22e formed on the inner peripheral surface thereof so that a hose disposed in water can be connected. The suction port 22a communicates with the first valve chamber 22d.

  The discharge casing 23 is formed in a bowl shape whose lower end opens with the same inner diameter as the cylinder 21. The discharge casing 23 includes a discharge port 23a formed in a part of its side surface, a hole 23b provided at the upper end of the discharge casing 23, a shaft seal member 23c provided in the hole 23b, and a discharge casing 23. A support portion 23 d provided on the outer surface and a regulating member 23 e provided on the outer surface of the discharge casing 23 are provided.

  The hole 23b is formed so that a piston rod 41 (to be described later) of the piston member 12 can be inserted and the shaft seal member 23c can be disposed. Moreover, the hole part 23b is provided with the cover body 23f which fixes the shaft sealing member 23c.

  The shaft seal member 23c supports the piston rod 41 so as to be slidable. The shaft seal member 23c is formed so as to be able to support the radial load of the piston rod 41. The shaft seal member 23 c is interposed between the discharge casing 23 and the piston rod 41 to seal between the discharge casing 23 and the piston rod 41. The shaft sealing member 23c is formed of, for example, a resin material that does not affect water quality.

The support portion 23d is formed so as to be able to support a part of the link mechanism portion 13.
The restricting member 23e is formed in an annular shape from a resin material and is detachably attached to the piston rod 41. The regulating member 23e is supported by the lid body 23f with the piston rod 41 inserted. The restricting member 23e is supported by the lid body 23f, and is formed so as to be able to contact a connecting portion 43 described later of the piston member 12.

  The restricting member 23 e is formed so as to be able to restrict the movement of the piston rod 41 by contacting the connecting portion 43. The restriction member 23e has a length in the axial direction such that, for example, the movement of the piston rod 41 can be restricted before the piston member 12 reaches the bottom dead center.

  The base 24 is fixed to the suction casing 22 or formed integrally, and is formed so as to be fixed to an installation portion of the hand pump 1 such as a well.

  The first check valve 25 protrudes obliquely upward from the first valve body 25a in contact with the first valve seat 22c and the substantially center of the surface of the first valve body 25a facing the piston member 12, and from the cover member 26 And a first protrusion 25b having a protruding tip. The first check valve 25 is provided in the first valve chamber 22d and is formed so as to be in contact with the first valve seat 22c.

  The cover member 26 is formed in a disk shape. The cover member 26 forms a water flow path, and a plurality of hole portions 26a in which the first protrusions 25b can be arranged in a part of the cover member 26, and a second portion provided substantially at the center of the surface facing the piston member 12. And a protruding portion 26b. The cover member 26 is provided between the cylinder 21 and the suction casing 22.

  The piston member 12 includes a piston rod 41, a piston portion 42 connected to the lower end side of the piston rod 41, and a connecting portion 43 provided on the upper end side of the piston rod 41.

  The piston rod 41 is formed in a cylindrical bar shape, and the piston portion 42 is fixed to the lower end portion. As for piston rod 41, the surface roughness of the part which slides at least with shaft seal member 23c of the peripheral face is formed with the predetermined accuracy. The piston rod 41 extends from the discharge chamber 11b to the outside of the main body 11 through the hole 23b and the shaft seal member 23c.

  The piston portion 42 includes a piston yoke 45 connected to the lower end side of the piston rod 41, a piston 46 provided on the piston yoke 45 so as to be slidable on the inner peripheral surface of the cylinder 21, and the piston 46 as a piston yoke. A piston presser 47 that is fixed to 45, and a second check valve 48 provided on the piston presser 47.

  The piston yoke 45 is branched and extended in a plurality of, for example, four directions, for example, in an arrangement having a constant interval around the piston rod 41.

  The piston 46 is formed of a resin material such as rubber, and is formed so as to be elastically deformable. The piston 46 is formed in a bowl shape with an upper part opened, and a part of the lower part is opened. The piston 46 divides the inside of the cylinder 21 in a liquid-tight manner and is slidable on the inner peripheral surface of the cylinder 21. The piston 46 is formed so that the inside of the cylinder 21 can be divided into a suction chamber 11a and a discharge chamber 11b.

  The piston presser 47 supports the piston 46 and clamps the piston 46 to the piston yoke 45 to fix the piston 46 to the piston rod 41. The piston retainer 47 includes an opening 47a having a smaller diameter than the opening of the piston 46 and a second valve seat 47b formed on a surface around the opening 47a facing the discharge casing 23. ing.

  The piston presser 47 is formed to be able to communicate with the suction chamber 11a and the discharge chamber 11b through the opening 47a. The piston presser 47 is formed so as to be able to contact the tip of the first protrusion 25 b of the first check valve 25. The piston yoke 45 and the piston presser 47 constitute a second valve chamber 42a having a second valve seat 47b in a space facing each other.

  The second check valve 48 is provided in the second valve chamber 42a and is formed so as to be in contact with the second valve seat 47b. The second check valve 48 is formed so as to be in contact with the second protrusion 26b of the cover member 26.

  The connecting portion 43 is formed so as to be connectable to the link mechanism portion 13. The connecting portion 43 is fixed to the end portion of the piston rod 41. The connecting portion 43 has an outer diameter larger than the outer diameter of the piston rod 41 and is formed so as to be able to come into contact with the regulating member 23e.

  The link mechanism unit 13 includes a first link member 51 and a second link member 52.

  Both ends of the first link member 51 in the longitudinal direction are connected to the support portion 23d and the second link member 52 by the connecting shaft 13a, respectively. The first link member 51 is formed in a plate shape and is supported by the support portion 23d so as to be rotatable about the connecting shaft 13a.

  The second link member 52 is connected to the connecting portion 43 and the first link member 51 by the connecting shaft 13a. The second link member 52 is formed in a plate shape and is supported by the connecting portion 43 and the first link member 51 so as to be rotatable with respect to the connecting portion 43 and the first link member 51. As for the 2nd link member 52, the connection part 43 is connected with the end of a longitudinal direction, and the operation lever 14 is connected to the other end of a longitudinal direction. Moreover, the 1st link member 51 is connected with the 2nd link member 52 in the middle part.

  Moreover, the 2nd link member 52 is provided with the 2nd fixing | fixed part 52a in the outer peripheral surface of the edge part to which the operation lever 14 is connected. The 2nd fixing | fixed part 52a is formed in plate shape, and is provided with the 2nd support shaft 52b in the part. The 2nd support shaft 52b is formed so that the buffer member 15 can be detachably supported. The second support shaft 52b is, for example, a bolt attached to the second support portion 52a or a columnar shaft fixed to the second fixing portion 52a.

  The operation lever 14 is a rod-like member that is connected to the end of the second link member 52 and has a predetermined length. The operation lever 14 includes a third fixing portion 14a at a part thereof, in other words, at a midway portion in the longitudinal direction. The third fixing portion 14a is formed in a plate shape and includes a third support shaft 14b in a part thereof. The third support shaft 14b is formed so that the buffer member 15 can be detachably supported. The third support shaft 14b is, for example, a bolt attached to the third fixing portion 14a or a columnar shaft fixed to the third fixing portion 14a.

  In addition, if the user can reciprocate the piston member 12, the length of the operation lever 14 can be suitably set according to the installation place and performance of the hand pump 1.

  The buffer member 15 is, for example, a hydraulic, hydraulic, gas or spring damper. The buffer member 15 includes a cylinder part 61 and a rod part 62. The buffer member 15 is formed so that the rod portion 62 can reciprocate with respect to the cylinder portion 61, and when moving in one direction, the internal fluid or spring becomes a resistance, and the moving speed of the rod portion 62 can be reduced. Is formed. The buffer member 15 is made of a weather-resistant material so that it can be used outdoors.

  The cylinder part 61 and the rod part 62 are each provided with a fixed part 63 that can be fixed to the first fixing part 21a, the second fixing part 52a, or the third fixing part 14a at their ends. The fixed part 63 of the cylinder part 61 is rotatably fixed to the second fixing part 52a. The fixed portion 63 of the rod portion 62 is rotatably fixed to the first fixing portion 21a or is fixed to the third fixing portion 14a.

  Such a buffer member 15 is restricted in its moving speed when the rod part 62 moves with respect to the cylinder part 61 in the direction in which the length in the axial direction extends, and the rotational speed of the link mechanism part 13 is controlled. This is a restriction of the movement of the piston member 12 when the piston member 12 moves to the bottom dead center side. That is, the buffer member 15 regulates the movement of the piston member 12 so that the piston member 12 (link mechanism unit 13) moves at a predetermined movement speed.

Next, the operation in the case of pumping water from a water source such as a well using the hand pump 1 will be described.
At the start of use of the hand pump 1, since air exists in the suction chamber 11a, first, so-called self-priming is performed in which the suction chamber 11a is filled with water. The user first fixes the buffer member 15 to the first fixing portion 21a and the second fixing portion 52a. Next, the operation lever 14 is operated to reciprocate the piston member 12. Specifically, when the operating lever 14 is positioned upward and the piston member 12 is positioned on the bottom dead center side, the user operates the operating lever 14 and rotates the end of the operating lever 14 downward. Move.

  By this operation, the operation lever 14 rotates around the end portion of the first link member 51, and the connecting portion 43 moves upward. Thereby, the piston rod 41 moves upward along the axial direction, and the piston part 42 moves to the top dead center side. When the piston part 42 moves toward the top dead center side, the volume of the suction chamber 11a formed by the piston part 42, the cylinder 21, the suction casing 22, the first check valve 25 and the second check valve 48 increases. .

  At this time, the suction port 22 a is closed by the first check valve 25, and the opening 47 a is closed by the second check valve 48. For this reason, if the piston part 42 moves to the top dead center side and the volume of the suction chamber 11a increases, the pressure of the suction chamber 11a will decrease. When the pressure on the primary side of the first check valve 25 becomes higher than the pressure in the suction chamber 11a, in other words, when the pressure in the suction chamber 11a becomes negative, the first check valve 25 moves upward and opens. Thus, the suction port 22a is opened. Thereby, water flows into the suction chamber 11a.

  When the piston portion 42 further moves and the first connecting pipe 31 is positioned in the suction chamber 11a, the air in the discharge chamber 11b moves into the suction chamber 11a. Thereby, the fall of the pressure in the suction chamber 11a is prevented further.

  Thus, water is pumped into the suction chamber 11a until the piston part 42 moves to the top dead center. At this time, the second check valve 48 is in contact with the second valve seat 47 b, that is, the second check valve 48 closes the opening 47 a of the piston presser 47. For this reason, the movement of water or air to the discharge chamber 11b is regulated.

  Next, the user operates the operation lever 14 to rotate the operation lever 14 upward. When the operation lever 14 rotates upward, the second link member 52 rotates so that the connecting shaft 13a connected to the connecting portion 43 moves downward about the connecting shaft 13a connected to the first link member 51. As a result, the piston rod 41 moves downward.

  As the piston rod 41 moves downward, the piston portion 42 moves to the bottom dead center side. When the piston part 42 moves to the bottom dead center side, the volume of the suction chamber 11a decreases, and the pressure in the suction chamber 11a increases. When the pressure in the suction chamber 11a becomes higher than the pressure in the discharge chamber 11b, in other words, when the pressure in the suction chamber 11a becomes higher than the atmospheric pressure, the second check valve 48 moves upward and becomes an open state. The opening 47a is opened. Thereby, the air and water in the suction chamber 11a flow into the discharge chamber 11b. When the piston portion 42 further moves and moves to the bottom dead center side, the connecting portion 43 comes into contact with the regulating member 23e and the movement of the piston portion 42 is restricted before the piston portion 42 reaches the bottom dead center.

  Thus, when the piston part 42 moves to the bottom dead center side, water is pumped into the discharge chamber 11b, and air in the suction chamber 11a moves to the discharge chamber 11b. The user repeatedly rotates the operation lever 14 until the suction chamber 11a is filled with water.

  Next, when the suction chamber 11a is filled with water, the user removes the fixed portion 63 of the rod portion 62 from the first fixing portion 21a, and attaches the fixed portion 63 to the third fixing portion 14a of the operation lever 14. To fix. These steps complete self-priming. Thereafter, the user can similarly reciprocate the operation lever 14 to reciprocate the piston portion 42 and pump water.

Next, an operation for precipitating water accumulated in the suction chamber 11a and the discharge chamber 11b by the precipitation function after using the hand pump 1 will be described.
When water in the main body 11 is allowed to rain after completion of pumping by the hand pump 1, first, the regulating member 23e is removed from the lid body 23f and the piston rod 41. Next, the operation lever 14 is rotated upward. At this time, the operation lever 14 is rotated until the connecting portion 43 comes into contact with the lid 23f and the movement of the operation lever 14 is restricted.

  By the rotation of the operation lever 14, the piston portion 42 moves to the bottom dead center, and the lower surface of the piston presser 47, the first protrusion 25 b of the first check valve 25, and the second protrusion of the cover member 26. 26b and the lower surface of the second check valve 48 come into contact with each other.

  When the first protrusion 25 b of the first check valve 25 is pressed by the piston presser 47, the first protrusion 25 b is pressed downward at a position eccentric from the center of the first check valve 25. Accordingly, the first check valve 25 is inclined, and the first valve body 25a is separated from the first valve seat 22c except for a part of the lower surface thereof, so that the first check valve 25 is forcibly opened. The suction port 22a communicates with the suction chamber 11a.

  Similarly, when the lower surface of the second check valve 48 is pressed by the second protrusion 26b, the second check valve 48 is separated from the second valve seat 47b, and the second check valve 48 is forcibly opened. The suction chamber 11a communicates with the discharge chamber 11b.

  As described above, the first check valve 25 and the second check valve 48 are forcibly opened to form one continuous space from the suction port 22a to the discharge chamber 11b. Rains.

  After the precipitation is finished, the operation lever 14 is operated to move the piston portion 42 from the bottom dead center to the top dead center side, and the regulating member 23e is provided on the piston rod 41 and disposed on the lid 23f. Thereby, the 1st check valve 25 and the 2nd check valve 48 will be in a closed state, and will be in a stand-by state in which use of the next hand pump 1 is possible.

  According to the hand pump 1 having such a configuration, when the piston member 12 moves to the bottom dead center side by the buffer member 15, it becomes resistance to the movement. Thereby, when air exists in the suction chamber 11a at the time of self-suction, even if the volume in the suction chamber 11a increases to become negative pressure, the negative pressure causes the piston member 12 to move toward the bottom dead center side. During the movement, the movement speed of the piston member 12 can be restricted to a predetermined movement speed. As a result, it is possible to prevent the piston member 12 from moving suddenly.

  That is, when the pressure in the suction chamber 11a becomes lower than the pressure (atmospheric pressure) in the discharge chamber 11b due to the negative pressure, the piston member 12 moves to the bottom dead center side due to the pressure difference between the suction chamber 11a and the discharge chamber 11b. To do. When the rod part 62 moves in the direction in which the buffer member 15 extends so that the buffer member 15 becomes a resistance when the piston member 12 moves to the bottom dead center side, the rod part 62 depends on the internal configuration of the buffer member 15. The moving speed of 62 is regulated. For this reason, when the piston member 12 moves to the bottom dead center side, the moving speed of the link mechanism portion 13 is restricted, and as a result, the moving speed to the bottom dead center side of the piston member 12 is reduced.

  Thus, when the link mechanism part 13 rotates in the direction in which the piston member 12 moves downward due to negative pressure, the movement of the piston member 12 is restricted by the buffer member 15 becoming resistance, and the piston is gently The member 12 will move. For this reason, since it can prevent that the piston part 42 moves to the bottom dead center side rapidly, it becomes possible to prevent that the operating lever 14 jumps up. Since it is possible to prevent the operation lever 14 from jumping up, safety during operation is increased.

  In addition, since the force for reciprocating the piston member 12 varies depending on the length of the operation lever 14, the force required for the operation can be adjusted by the operation lever 14 even if the buffer member 15 is provided. The buffer member 15 is rotatably provided on the first fixing portion 21a of the cylinder 21 and the second fixing portion 52a of the second link member 52, and the rod portion 62 is moved to the cylinder portion by the rotation of the second link member 52. A simple configuration for expanding and contracting with respect to 61 may be used.

  In addition, the buffer member 15 fixes the fixed portion 63 of the rod portion 62 fixed to the first fixing portion 21a to the third fixing portion 14a of the operation lever 14 after the self-priming, and thus after the self-priming. When pumping up water, the buffer member 15 can operate the operation lever 14 without causing resistance. Thus, the buffer member 15 can prevent the operation lever 14 from jumping only during self-priming, and has good operability without deteriorating the operability of the hand pump 1 during pumping.

  As described above, according to the hand pump 1 according to the present embodiment, when the piston member 12 moves to the bottom dead center side, the movement of the piston member 12 (link mechanism portion 13) is restricted by the buffer member 15. As a result, even if the pressure in the suction chamber 11a is reduced, the operation lever 14 can be prevented from jumping up.

  The present invention is not limited to the above embodiment. For example, although the hand pump 1 mentioned above demonstrated the structure which has a precipitation function, it is not limited to this. The hand pump 1 may be configured not to include the first protrusion 25b and the second protrusion 26b and not to have a precipitation function. By using a hand pump that does not have a precipitation function, for example, when used in a warm region where there is no risk of freezing, the manufacturing cost of the hand pump can be further reduced.

  In the above-described example, the hand pump 1 has a configuration in which the other end of the buffer member 15 whose one end is rotatably fixed to the second link member 52 is fixed to one of the cylinder 21 and the operation lever 14. It is not limited to this. For example, the hand pump 1 may have a configuration in which one end is fixed to the second link member 52 and the other end is fixed to the cylinder 21 at all times. By setting it as such a structure, it becomes possible to prevent the control lever 14 from jumping up at the time of self-priming similarly to the above-mentioned structure. In this configuration, when the piston member 12 moves to the bottom dead center side, the movement of the piston member 12 is always regulated by the buffer member 15, but the operation lever 14 can be operated by increasing the length of the operation lever 14. It is possible to prevent the deterioration of the sex.

  In addition, the configuration in which the buffer member 15 is fixed to the cylinder 21, the second link member 52, and the operation lever 14 when fixing to the hand pump 1 in order to restrict the movement of the piston member 12 on the bottom dead center side has been described. However, it is not limited to this. For example, the structure which provides a 1st fixing | fixed part in the suction casing 22 or the discharge casing 23 may be sufficient, and the structure which provides a 2nd fixing | fixed part in the 1st link member 51 may be sufficient. In addition, the rod portion 62 is not fixed to the operation lever 14 during pumping, but the fixed portion 63 of the cylinder portion 61 is removed from the second fixing portion 52a, and a fixing portion for fixing and supporting the cylinder portion 61 on the main body 11 is separately provided. It may be a configuration. In addition, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Hand pump, 11 ... Main body, 11a ... Suction chamber, 11b ... Discharge chamber, 12 ... Piston member, 13 ... Link mechanism part, 13a ... Connecting shaft, 14 ... Operation lever, 15 ... Buffer member, 21 ... Cylinder, 22 ... Suction casing, 22a ... Suction port, 22b ... Rib, 22c ... First valve seat, 22d ... First valve chamber, 22e ... Screw part, 23 ... Discharge casing, 23a ... Discharge port, 23b ... Hole part, 23c ... Shaft Sealing member, 23d ... support portion, 23e ... regulating member, 23f ... lid, 24 ... base, 25 ... first check valve, 25a ... first valve body, 25b ... first projection, 26 ... cover member, 26a ... hole part, 26b ... second projection part, 41 ... piston rod, 42 ... piston part, 42a ... second valve chamber, 43 ... coupling part, 45 ... piston yoke, 46 ... piston, 47 ... piston presser, 47a ... opening Part, 47b ... No. Valve seat, 48 ... second check valve, 51 ... first link member, 52 ... second link member.

Claims (4)

A cylindrical cylinder having an axial center disposed along the vertical direction, a suction casing provided at a lower end portion of the cylinder and constituting the cylinder and a suction chamber, and provided at an upper end portion of the cylinder, A main body having a discharge casing constituting a discharge chamber;
A piston member that is formed on the inner peripheral surface of the cylinder so as to be capable of reciprocating, divides the inside of the cylinder into the suction chamber and the discharge chamber, and a piston member that includes a piston rod connected to the piston portion;
An operation lever formed to be rotatable;
A link mechanism for connecting the operating lever and the piston rod, and converting the rotation of the operating lever into a reciprocating motion of the piston rod;
A buffer member that is provided in the link mechanism portion and serves as a resistance to movement of the link mechanism portion when the piston member moves to the bottom dead center side;
A hand pump characterized by comprising. The link mechanism portion is a first link member rotatably connected to the main body, and a second link in which the operation lever is connected to one end of the first link member rotatably connected to the piston rod and the first link member. A member,
2. The damper according to claim 1, wherein the buffer member is a damper having one end rotatably fixed to the main body and the other end rotatably fixed to the second link member. Hand pump.   The hand pump according to claim 2, wherein the buffer member is detachably provided on the second link member and the main body, and is fixed to the second link member and the main body during self-priming.   The hand pump according to claim 3, wherein the buffer member is fixed to the second link member and the operation lever after the self-priming is completed.