JP2015021485A - Hand pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand pump capable of improving a life of a shaft seal member.SOLUTION: A hand pump comprises: a main body 11 having a tubular cylinder 21 in which a suction side is formed at a lower part and an emission side is formed on an upper part, and an emission casing 22 provided on the emission side of the cylinder 21 and forming an emission chamber 11a together with the cylinder 21; a piston 55 formed on an inner periphery of the cylinder 21 slidably forward and backward; a piston rod 51 supporting one end of the piston 55; a link mechanism part 13 having an operation lever 73 formed rotatably around a fulcrum provided outside the emission casing 22 as a center, and link members 71, 72 converting rotation of the operation lever 73 into reciprocal movement of the piston rod 51; and a shaft seal member 34 having an insertion hole 41 provided on the emission casing 22 and formed to insert the piston rod 51, a seal member 47 shaft-sealing a portion between the piston rod 51 and the emission casing 22, and a bearing member 46 supporting the piston rod 51.

Description

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

  Currently, hand pumps are used to pump water from household wells and to supply drinking water during disasters such as earthquakes.

  Such a hand pump has a piston for sucking water and two valve bodies inside a cylinder having a suction casing at one end and a discharge casing at the other end. There is known a technique of providing and pumping water by opening and closing a valve body by reciprocating movement of a piston. 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 such a 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 rotation of the operation lever can be converted into the reciprocating motion of the piston rod.

JP 2009-013876 A

  The hand pump using the bearing member described above has the following problems. That is, the above-described hand pump is configured to convert the rotation operation of the operation lever into the reciprocating motion of the piston rod by the link mechanism. However, the link mechanism applies a load in a direction intersecting the axial direction of the piston rod when converting the rotation operation of the operation lever into the reciprocating motion of the piston rod. With this load, the piston rod is pressed to a part in the circumferential direction, and as a result, the piston rod presses a part in the circumferential direction of the shaft seal member.

  When the piston rod slides in a state where a part of the shaft sealing member in the circumferential direction is pressed by the piston rod, the shaft sealing member may be worn and damaged in a part of the circumferential direction. When the shaft seal member is worn or damaged, there is a risk that water leakage from the part may occur, and the number of maintenance increases. For this reason, there has been a demand for a hand pump capable of improving the life of the shaft seal member.

  Accordingly, an object of the present invention is to provide a hand pump capable of improving the life of the shaft seal member.

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

  As one aspect of the present invention, a cylindrical cylinder having a suction side at the bottom and a discharge side at the top, and a main body including a discharge casing provided on the discharge side of the cylinder and forming the cylinder and a discharge chamber A piston that is reciprocally slidable on the inner peripheral surface of the cylinder and that fluid-tightly divides the inside of the cylinder; a piston rod that supports one end of the piston; and a fulcrum provided outside the discharge casing. And a link member that connects the end of the operation lever and the end of the piston rod, and converts the rotation of the operation lever into a reciprocating motion of the piston rod. A link mechanism having an insertion hole formed in the discharge casing so that the piston rod can be inserted therein, the piston rod, and the discharge cartridge. Sealing member for shaft sealing between the single and, and a shaft sealing member having a bearing member for supporting the piston rod.

  According to the present invention, it is possible to provide a hand pump capable of improving the life of the shaft seal member.

Sectional drawing which shows the structure of the hand pump which concerns on the 1st Embodiment of this invention. Sectional drawing which shows the principal part structure of the hand pump. Sectional drawing which shows the principal part structure of the hand pump which concerns on the 2nd Embodiment of this invention.

Hereinafter, a hand pump 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a cross-sectional view showing a configuration of a hand pump 1 according to the first embodiment of the present invention. FIG. 2 is a configuration of a main part of the hand pump 1, specifically, a configuration of a shaft seal member 34 used in the hand pump 1. FIG.

  As shown in FIG. 1, the hand pump 1 is connected to a main body 11 that forms a discharge chamber 11 a and a suction chamber 11 b, a piston member 12 that is reciprocally movable inside the main body 10, and a piston member 12. And a link mechanism unit 13. The hand pump 1 has a pumping function by reciprocating movement of the piston member 12 and a precipitation function by a first protrusion 30b and a second protrusion 28b 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 having an axial center extending in a direction orthogonal to the water surface, and a discharge casing 22 connected to the upper end portion of the cylinder 21. The main body 11 has flange portions at opposite ends of the cylinder 21 and the discharge casing 22, and the cylinder portion 21 and the discharge casing 22 are integrated by fastening the flange portion with a seal member interposed with a fastening member such as a bolt. Configured.

  The cylinder 21 is formed in a cylindrical member 25 in which the piston member 12 is slidable on an inner peripheral surface thereof, a bowl-shaped suction cover 26 connected to a lower end surface of the cylindrical member 25, and the suction cover 26. The first check valve 27 and a cover member 28 provided between the cylindrical member 25 and the suction cover 26 are provided.

  The cylinder 21 has flange portions at opposite ends of the cylindrical member 25 and the suction cover 26, and the flange portion with the seal member interposed therebetween is fastened by a fastening member such as a bolt, whereby the cylindrical member 25 and the suction cover 26. Is configured integrally.

  The cylindrical member 25 is formed so that the piston member 12 can slide. The cylindrical member 25 is formed with a predetermined accuracy in the surface roughness of the inner peripheral surface and the degree of circularity with respect to the axis. Here, the predetermined accuracy refers to water leakage between the piston member 12 and the cylindrical member 25 in the reciprocating motion of the piston member 12, resistance and interference between the piston member 12 and the cylindrical member 25 during the reciprocating motion, or The accuracy of the pump function can be prevented from being lowered due to the damage of the piston member 12 and the like, and can be set as appropriate depending on the performance of the hand pump 1.

  The suction cover 26 includes a suction port 26 a provided at the lower end on the axial center of the suction cover 26. The suction port 26a has, for example, a threaded portion 26b formed on the inner peripheral surface thereof so that a hose disposed in water can be connected.

  The first check valve 27 includes a first valve chamber 29 and a first valve body 30 provided in the first valve chamber 29. The first valve chamber 29 includes a first valve seat 29a formed on the upper surface of the suction port 26a. The first valve body 30 includes a first valve portion 30a that contacts the upper surface of the first valve seat 29a, a first protrusion 30b that protrudes obliquely from the approximate center of the first valve portion 30a, and protrudes from the cover member 28. It is equipped with.

  The cover member 28 is formed in a disk shape. The cover member 28 forms a flow path of water, and a plurality of holes 28a in which the first protrusions 30b can be disposed in a part of the cover member 28 and a lower surface of a second valve body 62, which will be described later, are provided in the center. A second projecting portion 28b in contact therewith. The cover member 28 is provided between the cylindrical member 25 and the suction cover 26.

  The discharge casing 22 is formed in a bowl shape whose opening is connected to the cylindrical member 25. The discharge casing 22 is provided in the hole 33, a discharge port 31 formed in a part of the side surface, a discharge unit 32 connected to the discharge port 31, a hole 33 provided on the upper surface of the discharge casing 22, and the hole 33. The shaft sealing member 34 is provided, a support portion 35 provided on the outer surface of the discharge casing 22, and a regulating member 36 provided on the outer surface of the discharge casing 22.

  The hole 33 is formed so that a piston rod 51 (to be described later) of the piston member 12 can be inserted and the shaft seal member 34 can be disposed. Specifically, as shown in FIG. 2, the hole 33 includes an insertion hole 41 into which the piston rod 51 is inserted, a groove 42 in which the shaft sealing member 34 is disposed, and a lid 43 that closes the groove 42. I have.

  The insertion hole 41 is disposed on the upper surface of the discharge casing 22 and on the inner surface side of the discharge casing 22, in other words, on the discharge chamber 11 a side of the discharge casing 22. The groove part 42 includes a first groove part 42a provided adjacent to the insertion hole 41 and a second groove part 42b provided adjacent to the first groove part 42a. The first groove portion 42a has an inner diameter that is smaller than the inner diameter of the second groove portion 42b.

  The lid 43 covers an outer surface provided with the hole 33 of the discharge casing 22 and has an insertion hole 43a into which the piston rod 51 can be inserted. Specifically, the lid body 43 is formed so that the piston rod 51 can be inserted into the insertion hole 43a and the opening of the second groove portion 42b can be closed. The lid 43 is fixed to the discharge casing 22 by a fastening member such as a bolt. Further, the lid body 43 is formed on the upper surface thereof so that the regulating member 36 can be disposed.

  As shown in FIG. 2, the shaft seal member 34 includes a bearing member 46 disposed in the first groove portion 42a and a seal member 47 disposed in the second groove portion 42b. For example, the bearing member 46 is formed in a cylindrical shape having an inner diameter smaller than the insertion holes 41 and 43a. The bearing member 46 supports the piston rod 51 so as to be slidable. The bearing member 46 is formed so as to be able to support the radial load of the piston rod 51. The seal member 47 is an oil seal or a gland packing. The bearing member 46 and the seal member 47 are made of, for example, a resin material that does not affect the water quality.

  The piston member 12 includes a piston rod 51, a piston portion 52 fixed to the lower end side of the piston rod 51, and a connecting portion 53 that is provided on the upper end side of the piston rod 51 and can be connected to the link mechanism portion 13. And.

  The piston rod 51 is formed in a cylindrical rod shape. As for piston rod 51, the surface roughness of the part which slides with shaft seal member 34 of the outer peripheral surface is formed with predetermined accuracy. The piston rod 51 extends from the discharge chamber 11a to the outside of the main body 10 through the insertion hole 41, the shaft sealing member 34, and the insertion hole 43a.

  The piston portion 52 includes, for example, a piston yoke 55 connected to the lower end side of the piston rod 51, a piston 56 provided on the piston yoke 55 and formed to be slidable on the inner peripheral surface of the cylinder 21, and a piston 56. A piston presser 57 that is fixed to the piston yoke 55 and a second check valve 58 are provided.

  For example, the piston yoke 55 extends in a plurality of, for example, four directions, with an arrangement having a constant interval around the piston rod 51. The piston 56 is formed of a resin material such as rubber, for example, and is formed so as to be elastically deformable. The piston 56 is formed in a bowl shape with an upper part opened, and a part of the lower part is opened. The piston 56 divides the inside of the cylinder 21 in a liquid-tight manner and is slidable. The piston 56 is formed so that the inside of the cylinder 21 can be divided into a discharge chamber 11a and a suction chamber 11b.

  The piston presser 57 supports the piston 56 and fixes the piston 56 to the piston rod 51 by sandwiching the piston 56 with the piston yoke 55. The piston presser 57 includes an opening 57a formed at the center and a second valve seat 57b formed at the upper end of the opening 57a.

  The second check valve 58 includes a second valve chamber 61 having a second valve seat 57b formed in a space between the piston yoke 55 and the piston presser 57 on the center side of the piston 56, and a second valve chamber 61. A second valve body 62 provided in the two-valve chamber 61 and having a lower surface in contact with the second valve seat 57b. The second check valve 58 includes a second valve chamber 61 and a second valve body 62.

  The connecting portion 53 is formed so as to be connectable to the link mechanism portion 13.

  The restricting member 36 is formed in an annular shape from a resin material so that the piston rod 51 can be inserted. For example, the regulating member 36 is provided with a notch extending in the axial direction in a part of the outer peripheral surface thereof, and is formed so that the piston rod 51 can be inserted in an arc shape by expanding from the notch. The regulating member 36 is supported by the lid body 43 and is formed so as to be able to contact the connecting portion 53.

  The regulating member 36 is formed so as to be able to regulate the movement of the piston rod 51 by contacting the connecting portion 53. The restricting member 36 has a thickness that can restrict the movement of the piston rod 51 before the piston portion 52 reaches the bottom dead center. In other words, the regulating member 36 is formed so as to prevent the precipitation function from being activated by the piston rod 51 moving to the bottom dead center.

  The link mechanism portion 13 is connected to the support portion 35 of the discharge casing 22 by a connecting shaft 13a, and is supported by a first link member 71 that is rotatable about the connecting shaft 13a, and the connecting portion 53 and the first link member 71. And a second link member 72 that is connected to the connecting portion 53 and the first link member 71 so as to be rotatable. The link mechanism unit 13 has an operation lever 73 connected to the end of the second link member 72.

  The 1st link member 71 is formed in plate shape, and the both ends of the longitudinal direction are connected with the support part 35 and the 2nd link member 72, respectively. As for the 2nd link member 72, the connection part 53 is connected with the end of a longitudinal direction, and the operation lever 73 is connected to the other end of a longitudinal direction. Further, the second link member 72 is connected to the first link member 71 at a midway portion on the other end side.

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.
First, the user operates the operation lever 73 so that the end of the operation lever 73 rotates downward. By this operation, the operation lever 73 rotates around the end portion of the first link member 71 and moves the connecting portion 53 upward. At this time, the piston member 12 is supported by two points of the bearing member 46 and the cylinder 21, while the piston rod 51 is supported by the bearing member 46, and the piston 56 contacts the cylinder 21. For this reason, the piston rod 51 moves upward along the axial direction along with the rotation of the operation lever 73.

  As the piston rod 51 moves upward, the piston portion 52 also moves upward. When the piston portion 52 moves upward, the volume of the suction chamber 11b formed by the piston portion 52, the cylindrical member 25, the suction cover 26, the first check valve 27, and the second check valve 58 increases.

  At this time, since the suction port 26a is closed by the first check valve 20, when the volume of the suction chamber 11b increases, the pressure in the suction chamber 11b decreases. When the pressure on the primary side of the first check valve 27 becomes higher than the pressure in the suction chamber 11b, the first check valve 20 moves upward to be in an open state, and the suction port 26a is opened. Thereby, water flows into the suction chamber 11b.

  Thus, water is pumped into the suction chamber 11b until the piston part 52 moves to the top dead center. At this time, the second valve body 62 contacts the second valve seat 57b. That is, the second valve body 62 closes the opening 57 a of the piston presser 57. For this reason, the movement of the water to the discharge chamber 11a is controlled.

  Next, the user rotates the operation lever 73 upward about the connecting shaft 13 a of the first link member 71. When the operation lever 73 rotates upward, the second link member 71 rotates so that the connecting shaft 13a connected to the connecting portion 53 moves downward about the connecting shaft 13a connected to the first link member 71. As a result, the piston rod 51 moves downward.

  As the piston rod 51 moves downward, the piston portion 52 moves downward. When the piston portion 52 moves downward, the pressure in the suction chamber 11b increases, the first valve body 30 is pressed in the closing direction by the water in the suction chamber 11b, and the second valve body 62 It is pressed in the opening direction by the water in the chamber 11b. As a result, the first check valve 27 is closed and the second check valve 58 is opened, so that the water in the suction chamber 11b is pumped to the discharge chamber 11a.

  The piston rod 51 and the piston portion 52 reciprocate in the vertical direction by repeating the rotation operation of the operation lever 73 in the vertical direction. Accordingly, the first check valve 27 and the second check valve 58 are opened and closed, and the pumped water is discharged from the discharge portion 32 through the discharge port 31. At this time, since the movement of the piston rod 51 is regulated by the regulating member 36, the position of the end point where the piston portion 52 moves downward is not the bottom dead center, but slightly above the top dead center side. Is the position.

Next, an operation for precipitating water accumulated in the discharge chamber 11a and the suction chamber 11b by the precipitation function after using the hand pump 1 will be described.
When the water in the main body 10 is allowed to rain after completion of pumping by the hand pump 1, first, the regulating member 36 is removed from the lid 43 and the piston rod 51. Next, the operation lever 73 is rotated upward. At this time, the operation lever 73 is rotated until the connecting portion 53 comes into contact with the lid body 43 and the movement of the operation lever 73 is restricted.

  By the rotation of the operation lever 73, the piston portion 52 moves to the bottom dead center. When the piston 52 moves to the bottom dead center, the lower surface of the piston retainer 57 and the first protrusion 30b of the first valve body 30, and the lower surface of the second valve body 62 and the second protrusion 28b of the cover member 28 are respectively Abut.

  When the first protrusion 30b of the first valve body 30 is pressed by the piston retainer 57, the first protrusion 30b is pressed downward at a position eccentric from the center of the first valve body 30, and therefore the first valve body 30 is separated from the first valve seat 29a except for a part of its lower surface. As a result, the first valve body 30 is forcibly opened, and the first check valve 27 is opened.

  Similarly, the suction chamber 11b and the suction port 26a are continuous. When the lower surface of the second valve body 62 is pressed by the second protrusion 28b, the second valve body 62 is forcibly opened by the second protrusion 28b, the second check valve 58 is opened, and the discharge chamber 11a and the suction chamber 11b continue.

  In this way, by forcibly opening the first valve body 30 and the second valve body 62 respectively, a continuous space from the suction port 26a to the discharge chamber 11a is formed, and the main body is pressed by the atmospheric pressure. The water accumulated in 10 will flow back (precipitate) to the water source.

  After the precipitation is finished, the first check valve 27 and the second check valve 58 are closed by providing the restricting member 36 on the piston rod 51 and placing it on the lid body 43 again.

  According to the hand pump 1 having such a configuration, the piston member 12 can prevent the seal member 47 from being worn since the piston rod 51 is pivotally supported by the bearing member 46.

  More specifically, the piston rod 51 reciprocates in one axial direction by the rotation of the second link member 72 and the operation lever 73. For this reason, by the rotation of the second link member 72, a load for rotating the piston portion 52 around the piston portion 52, that is, a radial load, is applied to the piston rod 51 by the connecting portion 53. A part of the circumferential direction 34 is pressed.

  The bearing member 46 has an inner diameter that is smaller than the inner diameters of the insertion holes 41 and 43a. For this reason, the bearing member 46 supports the piston rod 51 and can prevent the piston rod 51 from pressing the seal member 47 excessively.

  For this reason, the bearing member 46 can prevent the seal member 47 from sliding excessively in contact with the piston rod 51. That is, the bearing member 46 can prevent the seal member 47 from being worn or damaged due to the piston rod 51 sliding with the seal member 47 in a state where a high load is applied. It becomes an improvement. Thereby, the hand pump 1 can improve the life of the shaft seal member 34 and can reduce maintenance.

  As described above, according to the hand pump 1 according to the present embodiment, the life of the shaft sealing member 34 can be improved.

Next, a hand pump 1 according to a second embodiment of the present invention will be described with reference to FIG. In addition, in the hand pump 1 which concerns on 2nd Embodiment, the code | symbol same about the structure similar to the hand pump 1 which concerns on 1st Embodiment mentioned above is attached | subjected, and the detailed description is abbreviate | omitted.
The hand pump 1 includes a main body 11A that forms a discharge chamber 11a and a suction chamber 11b, a piston member 12 that is reciprocally movable inside the main body 11A, and a link mechanism portion 13 that is connected to the piston member 12. I have.

  For example, the main body 11A is arranged with its lower end facing the water surface. The main body 11 </ b> A includes a cylindrical cylinder 21 having an axial center extending in a direction perpendicular to the water surface, and a discharge casing 22 </ b> A connected to the upper end of the cylinder 21.

  The discharge casing 22 </ b> A is formed in a bowl shape whose opening is connected to the cylindrical member 25. The discharge casing 22A is provided in the discharge port 31 formed in a part of the side surface, the discharge portion 32 connected to the discharge port 31, a hole portion 33A provided on the upper surface of the discharge casing 22, and the hole portion 33A. The shaft sealing member 34 is provided, and a support portion 35 provided on the outer surface of the discharge casing 22.

  The hole 33A is formed so that the piston rod 51 of the piston member 12 can be inserted and the shaft seal member 34 can be disposed. The hole 33 </ b> A inserts the piston rod 51 and forms a predetermined gap with the piston rod 51.

  Specifically, as shown in FIG. 3, the hole 33A includes an insertion hole 41 into which the piston rod 51 is inserted, a groove portion 42 in which the shaft sealing member 34 is disposed, and a lid body 43 that closes the groove portion 42. I have.

  The insertion hole 41 is provided on the center side of the upper surface of the discharge casing 22A. The groove 42 is adjacent to the insertion hole 41 and the first groove 42a provided on the outer surface side of the discharge casing 22A, and the second groove provided adjacent to the insertion hole 41 and on the inner surface side of the discharge casing 22A. A groove portion 42b. The first groove portion 42a has a smaller inner diameter than the second groove portion 42b.

  The lid 43 covers the outer surface of the discharge casing 22 provided with the hole 33, and the first lid 43b in which the insertion hole 43a into which the piston rod 51 can be inserted is formed, and the hole 33 of the discharge casing 22 A second lid 43d that covers the provided inner surface and has an insertion hole 43c into which the piston rod 51 can be inserted.

  Specifically, the first lid 43b is formed so that the piston rod 51 can be inserted through the insertion hole 43a and the opening of the first groove 42a can be closed. The second lid 43d is formed so that the piston rod 51 can be inserted through the insertion hole 43c and the opening of the second groove 42b can be closed. The first lid body 43b and the second lid body 43d are fixed to the discharge casing 22 by fastening members such as bolts.

  As shown in FIG. 3, the shaft seal member 34 includes a bearing member 46 disposed in the first groove portion 42a and a seal member 47 disposed in the second groove portion 42b. For example, the bearing member 46 is formed in a cylindrical shape having an inner diameter smaller than the insertion holes 41 and 43a.

  The hand pump 1 according to the second embodiment configured as described above is different from the above-described hand pump 1 according to the first embodiment in the arrangement of the bearing member 46 and the seal member 47 of the shaft seal member 34. Although there are other configurations, they are formed in substantially the same configuration.

  According to the hand pump 1 configured as described above, similarly to the hand pump 1 according to the first embodiment described above, it becomes possible to prevent wear and damage due to excessive contact with the piston rod 51, and the seal. The life of the member 47 is improved. Thereby, the hand pump 1 can improve the life of the shaft seal member 34 and can reduce maintenance.

  As described above, according to the hand pump 1 according to the present embodiment, the life of the shaft sealing member 34 can be improved.

  The present invention is not limited to the above embodiment. For example, the above-described hand pump 1 has been described as having a precipitation function, but is not limited thereto. The hand pump 1 may not be provided with the first protrusion 30b and the second protrusion 28b, and may not 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.

  Moreover, although the hand pump 1 mentioned above demonstrated the structure which provides the discharge part 32 in the discharge outlet 31, it is not limited to this. For example, the hand pump 1 can be applied as a configuration in which a relief valve or a check valve is provided in the discharge unit 32. Thereby, water can be discharged in a state where the water pressure is further increased, and backflow can be prevented.

  Moreover, although the shaft seal member 34 described above has been described using a configuration in which one bearing member 46 and one seal member 47 are provided as shown in FIGS. 1 to 3, the present invention is not limited to this. As long as the shaft seal member 34 can support the piston rod 51 in the radial direction by the bearing member 46, the shaft seal member 34 may have a plurality of bearing members 46 and seal members 47. In addition, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Pump, 10 ... Main body, 11a ... Discharge chamber, 11b ... Suction chamber, 11 ... Main body, 12 ... Piston member, 13 ... Link mechanism part, 13a ... Connecting shaft, 20 ... Check valve, 21 ... Cylinder, 22 ... Discharge casing, 25 ... cylindrical member, 26 ... suction cover, 26a ... suction port, 27 ... first check valve, 28 ... cover member, 28a ... hole, 28b ... first projection, 29 ... first valve chamber, 29a ... 1st valve seat, 30 ... 1st valve body, 30a ... 1st valve part, 30b ... 1st projection part, 31 ... Discharge port, 32 ... Discharge part, 33 ... Hole part, 33A ... Hole part, 34 ... Shaft sealing member, 35 ... support portion, 36 ... regulating member, 41 ... insertion hole, 42 ... groove portion, 42a ... first groove portion, 42b ... second groove portion, 43 ... lid body, 43a ... insertion hole, 43b ... lid body, 43c ... insertion hole, 43d ... lid, 46 ... bearing member, 47 ... seal member, 51 ... piston 52, piston part, 53 ... coupling part, 55 ... piston yoke, 56 ... piston, 57 ... piston retainer, 57a ... opening, 57b ... second valve seat, 58 ... second check valve, 61 ... first 2 valve chambers, 62 ... second valve element, 71 ... first link member, 72 ... second link member, 73 ... operating lever.

Claims (3)

A cylindrical cylinder having a suction side at the bottom, a discharge side at the top, and a body provided with a discharge casing provided on the discharge side of the cylinder and forming the cylinder and a discharge chamber;
A piston formed on the inner circumferential surface of the cylinder so as to be slidable in a reciprocating manner, and liquid-tightly dividing the cylinder;
A piston rod that supports one end of the piston;
An operation lever formed to be rotatable around a fulcrum provided on the outside of the discharge casing, and an end of the operation lever and an end of the piston rod are connected, and the operation lever is rotated. A link mechanism having a link member that converts the reciprocating motion of the piston rod;
A shaft seal provided in the discharge casing and provided with an insertion hole formed so that the piston rod can be inserted therein, a seal member for shaft sealing between the piston rod and the discharge casing, and a bearing member for supporting the piston rod. Members,
A hand pump characterized by comprising.   The hand pump according to claim 1, wherein the bearing member has a larger diameter than the insertion hole.   The hand pump according to claim 2, wherein the bearing member is formed to be able to slide the piston rod and support a load in a radial direction.

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