JP6140876B1 - Arc cylinder pump - Google Patents

Abstract

A pump that can be used in a compact manner is provided. An arc cylinder pump 2 is a pump having a cylinder 4 formed so that a cylinder axis is curved in an arc shape, and a piston 6 is disposed in the cylinder 4. . A piston rod 8 is connected to the piston 6. The piston rod 8 rotates around a circular arc center 36 formed by a cylindrical shaft in accordance with an external force. As a result, the piston 6 reciprocates while sliding in the cylinder 4 and functions as a pump. [Selection] Figure 1

Description

  The present invention relates to a pump.

  One pump is a bicycle pump. Bicycle air pumps have a structure in which a piston is loaded into a straight cylinder, and a piston rod is connected to the piston (hereinafter, the pump having the structure is referred to as a “straight cylinder pump”). . The straight type cylinder pump grips the piston rod protruding from the cylinder and manually reciprocates the piston, whereby air is discharged from a discharge port provided at the tip of the cylinder and enters the tire.

Japanese Patent No. 5010317

  The straight type cylinder pump is a direct-acting pump in which the piston rod moves directly. When the piston rod is pulled out during use, the total length of the pump is the sum of the cylinder length and the piston rod length, that is, about twice the cylinder length. It becomes the length. In other words, in order to use a straight type cylinder pump, a linear space of about twice the cylinder length is required.

  An object of this invention is to provide the pump which can be used compactly.

  In order to achieve the above object, an arc cylinder pump according to the present invention includes a cylinder having a cylindrical shaft formed in an arc shape, a piston disposed in the cylinder, and an arc circle formed by the cylindrical shaft by an external force. And a transmission body that rotates along the cylinder about a center and transmits the external force to the piston.

  An arc cylinder pump of the present invention is a cylindrical container having a cylinder having a cylindrical shaft formed in an arc shape, and a body portion having a bellows disposed in the cylinder and capable of extending and contracting in the length direction. And a transmission body that rotates along the cylinder about an arc center formed by the cylindrical shaft by an external force and transmits the external force to the bottom of the cylindrical container.

  When an external force is applied to the transmission body, the circular cylinder pump of the present invention rotates the transmission body to transmit the external force to the piston or the cylindrical container. Negative pressure or positive pressure is generated in the interior of the cylinder, and as a result, fluid is sucked or discharged into the cylinder or the like. Here, the present invention functions as a rotary pump in which the cylinder is formed in an arc shape and the transmission body rotates along the cylinder around the center of the arc. For this reason, the present invention does not require a linear space that is about twice the cylinder length as in the conventional straight cylinder pump, and can be used in a compact manner.

The perspective view of the circular arc cylinder pump concerning a 1st embodiment. The exploded view of the circular arc cylinder pump concerning a 1st embodiment. In the arc type cylinder pump concerning a 1st embodiment, (a) partial assembly figure by the side of a cylinder, (b) partial assembly drawing by the side of a piston. Explanatory drawing in the case of using the circular arc cylinder pump which concerns on 1st Embodiment as a syringe. The perspective view of the circular arc cylinder pump which concerns on 2nd Embodiment. The exploded view of the circular arc cylinder pump concerning a 2nd embodiment. The perspective view of the circular arc cylinder pump which concerns on 3rd Embodiment.

  Hereinafter, embodiments of an arc cylinder pump (a pump including an arc cylinder) of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
As shown in FIGS. 1 to 3, the arc cylinder pump 2 according to the first embodiment has a configuration in which a cylinder 4, a piston 6 and a piston rod 8 are interposed between a pair of holders 10a and 10b. It has become.

  Each holder 10a, 10b is configured to include bases 12a, 12b and combination parts 14a, 14b. Each of the base bodies 12a and 12b has a disc shape and is disposed so that the center (center) 34a and 34b are coaxial with each other, and the shaft (hereinafter referred to as “rotation axis P1”). .) Are combined by the combination portions 14a and 14b so as to be relatively rotatable around. The combination part 14a is a cylindrical bearing provided in the circular center part of one base | substrate 12a. The combination part 14b is provided in the center part of the other base 12b, is a cylindrical shaft part, and is inserted into the combination part 14a. The cylinder 4 is fixed to the one base 12a, and the piston 6 and the piston rod 8 are fixed to the other base 12b.

  The cylinder 4 is formed such that its cylinder axis P2 is curved in a semicircular arc shape. The cylinder axis P2 is a center line in the cylinder that extends from one end 20 to the other end 22 of the cylinder. The semicircular cylinder 4 is formed on one base 12a so that a semicircular arc center 36 (hereinafter referred to as “the center 36 of the cylinder 4”) formed by the cylinder axis P2 is positioned on the rotation axis P1. It is arranged. One end 20 of the cylinder 4 is open, and the other end 22 is provided with a cylinder port 24 that communicates the inside and outside of the cylinder 4 and extends outward. A cylinder unit 26 is constituted by the cylinder 4 and the holder 10a.

  The piston rod 8 is curved in the same semicircular arc shape as the cylinder axis P2 of the cylinder 4, and the circular center 38 of the piston rod 8 is located at the same position as the circular center 36 of the cylinder 4 on the rotation axis P1. It is attached to the other base 12b through the attachment portion 28. For this reason, the piston rod 8 inserted into the cylinder 4 rotates on the cylinder axis P <b> 2 of the cylinder 4. The piston rod 8 has the same length as the cylinder length (the length from one end 20 to the other end 22 of the cylinder), and the piston 6 is attached to the tip thereof. The aspect of piston 6 is not specifically limited, A well-known aspect is employ | adopted. In the present embodiment, a cylindrical piston 6 that reciprocates while sliding on the inner wall of the cylinder 4 is used. A piston unit 30 is constituted by the piston 6, the piston rod 8, and the holder 10b.

  The arc-type cylinder pump 2 of the present embodiment having the above-described configuration is a hand-held type, and is operated by gripping the edges 32 of the holders 10a and 10b by the user. When the piston unit 30 is rotated (forward or reverse) with respect to the cylinder unit 26 by the user, the piston rod 8 is rotated around the rotation axis P1 along with the rotation, and the piston 6 is rotated. The cylinder 4 reciprocates. Along with the reciprocating motion of the piston 6, positive pressure or negative pressure is generated in the cylinder 4, and fluid such as gas or liquid is discharged to the outside of the cylinder 4 through the cylinder port 24 by the positive pressure, and the fluid is discharged by the negative pressure. Inhaled into the cylinder 4.

  In the arc-type cylinder pump 2 of this embodiment, the piston rod 8 is rotated along the cylinder 4 around the circular center 36 of the cylinder 4 by an external force, and is used as a transmission body that transmits the external force to the piston 6. It is functioning. Further, the holder 10 a functions as a cylinder support that supports the cylinder 4. Furthermore, the holder 10b functions as a piston support that supports the piston 6 via the piston rod 8 (transmission body). Further, the base body 12b of the holder 10b extends in the same direction as the radial direction of the circle including the semicircular arc formed by the cylinder axis P2 of the cylinder 4 from the combination portion 14b. It functions as an extension to which power (external force) is applied.

  In the arc cylinder pump 2 of the present embodiment, the cylinder 4 is formed in a semicircular arc shape, and the piston rod 8 rotates around the circumference including the cylinder axis P2 of the cylinder 4 with the circle center 36 of the cylinder 4 as the center. It functions as a rotating pump that moves. According to such a circular cylinder pump 2, when the piston rod 8 is pulled during use, the cylinder 4 and the piston rod 8 form a substantially annular shape around the circular center 36. Unlike a cylinder pump, it does not require a linear space and can be used in a compact manner.

  Further, a holder 10a for supporting the cylinder 4 and a holder 10b for supporting the piston rod 8 are combined through respective combination portions 14a and 14b, and the combination portions 14a and 14b are connected to the rotation of the piston rod 8. The cylinders 4 can be rotated around each other around a circular center 36 of the cylinder 4 that is the center of movement. That is, the piston rod 8 is combined with each other around the circular center 36 of the cylinder 4 by the pair of holders 10a and 10b. Since the arc-shaped cylinder pump 2 of this embodiment is operated by holding such a pair of holders 10a and 10b, the shaft rod of the piston rod 8 relative to the cylinder 4 does not occur. Therefore, in the conventional straight type cylinder pump, since the piston rod easily shakes with respect to the cylinder when the piston rod is pulled out, the problem that the operation of the pump is not easy is the arc type cylinder pump of this embodiment. 2 can be solved.

Further, in the piston unit 30, the edge 32 of the other base 12b corresponds to the lever power point, the combination portion 14b corresponds to the lever fulcrum, and the portion provided with the attachment portion 28 corresponds to the lever operating point. Yes. Therefore, the arc cylinder pump 2 of the present embodiment can push the piston rod 8 by the action of the lever. Therefore, in the conventional straight type cylinder pump, when a positive pressure is generated in the cylinder by pushing the piston rod, the pressure acts on the piston rod as a reaction. Accordingly, it is possible to push the piston rod 8 with a small force. Furthermore, let L _{1 be} the distance from the circle center 38 of the piston rod 8 to the piston rod 8, f ₁ be the force applied to the piston rod 8, and the distance from the circle 34b to the edge 32 of the other substrate 12b (the radius of the substrate 12b). ) and _{L 2,} when the force applied to the edge 32 by the user and the _{f 2,} the relationship _{f 1 × L 1 = f 2} × L 2 is satisfied. Then, it obtained from the relational expression as _{f 2 = f 1 × L 1} / L 2. Accordingly, as L ₂ is longer than L ₁ , the user's force is smaller. That is, as the radius of the other base 12b is larger than the turning radius of the piston rod 8, the operation of the pump can be saved.

  Furthermore, since the unevenness | corrugation is formed in the edge 32 of each base | substrate 12a, 12b, when a user applies force, it can apply force, without slipping.

  The circular arc cylinder pump 2 of the present embodiment can be used for various applications. For example, as shown in FIG. 4, it can be used as a syringe including the arc-shaped cylinder pump 2 of the present embodiment and an injection needle 42 having a needle base 40 into which the tube port 24 of the cylinder 4 is fitted.

  The present invention is not limited to the first embodiment described above, and may be a second embodiment or a third embodiment described below. In the following description of the second embodiment and the third embodiment, the description of the configuration common to the first embodiment will be omitted or simply referred to as necessary.

[Second Embodiment]
As shown in FIGS. 5 and 6, the arc-type cylinder pump 44 according to the second embodiment has a configuration in which a cylinder 46, a piston 7, and a piston rod 48 are interposed between a pair of holders 10 a and 10 b. A bellows tube 50 is placed in the cylinder 46.

  The cylinder 46 is formed such that its cylinder axis P3 is curved in a dominant arc shape, and a dominant arc center 52 (hereinafter referred to as “the center 52 of the cylinder 46”) forming the cylinder axis P3 is one side. It arrange | positions so that it may be located on the circle center 34a (rotating shaft P1) of the base | substrate 12a. In the cylinder 46 of this embodiment, a slit 54 is formed on the peripheral wall facing the combination portion 14 a, and the slit 54 is formed to be elongated from one end 56 to the other end 58 of the cylinder 46. Both ends 56 and 58 of the cylinder 46 are open, and a nozzle cap 60 is attached to the other end 58. The nozzle cap 60 includes a cap portion 62 that covers the other end 58 of the cylinder 46, and a nozzle portion 64 that extends from the center portion of the cap portion 62. The cap 62 is formed with, for example, a female screw that is screwed into a male screw formed on the surface of the other end 58 of the cylinder 46 and is detachable from the cylinder 46. The nozzle cap 60 is attached to the cylinder 46 after the bellows tube 50 is placed in the cylinder 46.

  The bellows tube 50 is a cylindrical container containing a paste-like liquid represented by toothpaste and mayonnaise. The bellows tube 50 has a circular bottom 66, a body 68 extending from the bottom 66, and a tip of the body 68. The body portion 68 is formed with a bellows that can be expanded and contracted. When the bellows tube 50 is placed in the cylinder 46, the bottom 66 of the bellows tube 50 comes into contact with the piston 7 disposed in the cylinder 46. In addition, the positioning structure which positions the nozzle part 64 and the mouth part 70 mutually so that the mouth part 70 of the bellows tube 50 and the mouth of the nozzle part 64 of the nozzle cap 60 may mutually communicate is the nozzle part 64 and the mouth part 70. Each may be formed. Such a positioning structure employs, for example, a female screw formed on the inner side of the nozzle portion 64 and a male screw that is screwed into the female screw and formed on the outer side of the mouth portion 70.

  The piston 7 is arranged in the cylinder 46 and is common to the piston 6 of the first embodiment in that the piston 7 reciprocates in the cylinder 46. However, like the piston 6, the piston 7 needs to move in contact with the inner wall of the cylinder 46. There is no. A piston rod 48 is connected to the piston 7. The piston rod 48 is a plate-like body that is connected to the combination part 14 b through the slit 54 from the piston 7 in the cylinder 46, and rotates along the slit 54 about the circle center 52 of the cylinder 46. In addition, the combination part 14b of this embodiment is a cylindrical bearing provided in the center part of the other base 12b. Moreover, the combination part 14a is a column-shaped axial part provided in the center part of one base | substrate 12a.

  The arc cylinder pump 44 of the present embodiment is also hand-held, and is operated by gripping the edges 32 of the pair of holders 10a and 10b by the user. When the piston unit 72 is rotated forward with respect to the cylinder unit 74 in which the bellows tube 50 is inserted, the piston rod 48 is rotated around the rotation axis P1, and the piston 7 is moved back (the other end 58) in the cylinder 46. Move towards. The bellows tube 50 is pressed by the piston 7 to contract, and the fluid in the bellows tube 50 is discharged from the nozzle portion 64.

  In the arc-shaped cylinder pump 44 of the present embodiment described above, the piston rod 48 functions as a transmission body that rotates along the cylinder 46 around the circular center 52 of the cylinder 46 by an external force and transmits the external force to the piston 7. doing. Further, the holder 10 a functions as a cylinder support that supports the cylinder 46. Furthermore, the holder 10b functions as a piston support that supports the piston 7 via a piston rod 48 (transmission body). Further, the base body 12b of the holder 10b extends in the same direction as the radial direction of the circle including the dominant arc formed by the cylinder axis P3 of the cylinder 46 from the combination portion 14b, and the edge 32 (tip portion) of the base 12b is rotated by the user. It functions as an extension to which power (external force) is applied.

  In the arc-type cylinder pump 44 of the second embodiment, the cylinder 46 is formed in a dominant arc type, and the piston rod 48 rotates around the circumference including the cylinder axis P3 of the cylinder 46 around the center 52 of the cylinder 46. It functions as a rotating pump that moves. According to such an arc cylinder pump 44, the piston rod 48 rotates between the cylinder 46 and its circular center 52, and therefore requires a straight space as in the conventional straight cylinder pump. It is possible to use it compactly.

  Further, a holder 10 a that supports the cylinder 46 and a holder 10 b that supports the piston rod 48 are combined via respective combination portions 14 a and 14 b, and the combination portions 14 a and 14 b are connected to the piston rod 48. The cylinder 46, which is the center of movement, can be rotated around the center 52 of the cylinder 46. That is, the pair of holders 10 a and 10 b are combined so that the piston rod 48 can be rotated around the circular center 52 of the cylinder 46. Since the arc-type cylinder pump 44 of this embodiment is operated by holding such a pair of holders 10a and 10b, there is no shaft shake of the piston rod 48 with respect to the cylinder 46, and stable operation is possible.

In the piston unit 72, the edge 32 of the other base 12b corresponds to the lever's force point, the combined portion 14b corresponds to the lever's fulcrum, and the connecting portion between the piston rod 48 and the piston 7 corresponds to the lever's operating point. ing. Therefore, the arc cylinder pump 44 of the present embodiment can contract the bellows tube 50 with a small force by the action of the lever. Further, the distance from the pivot center of the piston rod 48 to the connection portion with the piston 7 is L ₁ , the force applied to the piston 7 is f _1, and the distance from the circle center 34b of the other base 12b to the edge 32 (base 12b The relational expression of f ₁ × L ₁ = f ₂ × L ₂ is established, where L ₂ is the radius of ( ₂ ) and f ₂ is the force applied to the edge 32 by the user. Then, it obtained from the relational expression as _{f 2 = f 1 × L 1} / L 2. Accordingly, the longer L ₂ is than L ₁ , the smaller the user's force is. That is, as the radius of the other base 12b is larger than the length of the piston rod 48, the operation of the pump can be saved.

  Furthermore, in the present embodiment, the bellows tube 50 containing a predetermined fluid is used by being stored in the cylinder 46. Therefore, the bellows tube 50 suitable for the user's use can be appropriately replaced and used. it can.

  Further, the bottom 66 of the bellows tube 50 and the piston 7 may be bonded with an adhesive or the like. In such an embodiment, after the liquid is squeezed out from the bellows tube 50, the piston rod 48 is moved toward the one end 56, whereby a negative pressure is generated in the bellows tube 50 and the liquid can be sucked. It becomes.

[Third Embodiment]
The arc-type cylinder pump 76 according to the third embodiment is an inflator of the bicycle 78, and the cylinder 4, the piston valve 80, and the piston rod 82 are attached to the frame of the bicycle 78 as shown in FIG. It has a configuration.

  The bicycle 78 includes a known diamond frame, and a bracket 88 is installed between a lower pipe 84 and a standing pipe 86 of the diamond frame. The bracket 88 has a plate shape and is parallel to a reference center plane of the bicycle 78 (a plane formed by a center line of a head pipe (not shown), an upper pipe (not shown), a standing pipe 86, and a lower pipe 84). It is arranged in. The arc cylinder pump 76 of this embodiment is attached to such a bracket 88. The frame structure of the bicycle 78 is not limited to the diamond frame, and other known frame structures may be adopted as long as the bracket 88 can be attached.

  The arc-type cylinder pump 76 includes a cylinder 4 formed so that the cylinder axis is curved in a semi-arc shape. Between the both ends 20 and 22 of the cylinder 4, a stay 90 welded to the both ends 20 and 22 extends in a plate shape. The stay 90 is arranged so as to overlap the bracket 88. The stay 90 and the bracket 88 are provided with attachment holes communicating with each other, and the stay 90 is attached to the bracket 88 by screwing a nut into a bolt passed through the attachment hole.

  A known piston valve 80 used for inflating a bicycle is loaded in the cylinder 4 so as to reciprocate while sliding on the inner wall of the cylinder. A tip end of a piston rod 82 is connected to the piston valve 80. The piston rod 82 is a rod-like body having substantially the same length as the cylinder length of the cylinder 4, and is curved in the same semicircular arc shape as the cylinder axis P <b> 2 (FIG. 3) of the cylinder 4. Such a piston rod 82 is arranged so that its circular center is located at the same position as the circular center of the cylinder 4.

  A shaft 92 passing through the center of the piston rod 82 and the center of the cylinder 4 extends vertically from the stay 90. A joint portion 94 of a lever 96 is rotatably connected to the shaft 92. The lever 96 is composed of the joint portion 94, an extending portion 97, and a nail 100. The extension part 97 extends from the joint part 94. The extending direction is the same direction as the radial direction of the circle including the semicircular arc formed by the cylinder axis P <b> 2 of the cylinder 4, and is a direction passing through the annular portion 98 provided at the rear end of the piston rod 82. A nail 100 is provided at the tip of the extending portion 97 to be gripped by the user. The lever 96 can be disassembled into a front lever and a rear lever before and after the annular portion 98, but is not limited to such a mode, and the rear lever may be configured to be extendable.

  A cap 102 is attached to the other end 22 of the cylinder 4, and a hose 104 extends from the cap 102. At the tip of the hose 104, a base (not shown) that fits the tire valve of the front tire (not shown) and the rear tire (not shown) is provided. A base (not shown) is attached to a tire valve of a tire to be inflated so that it can be inflated.

  In the arc-shaped cylinder pump 76 of the present embodiment, the user grips the nigiri 100 and rotates the lever 96, so that the piston rod 82 connected to the lever 96 is centered on the circle center of the cylinder 4. It rotates on the cylinder axis P2 (FIG. 3). As a result, the piston valve 80 reciprocates while sliding in the cylinder 4. As the piston valve 80 reciprocates, the air taken into the cylinder 4 is compressed and injected into the tire through the hose 104 and a base (not shown).

  In the arc-shaped cylinder pump 76 described above, the piston rod 82 functions as a transmission body that rotates along the cylinder 4 around the center of the cylinder 4 by an external force and transmits the external force to the piston valve 80. The stay 90 functions as a cylinder support that supports the cylinder 46. Further, the lever 96 functions as a piston support that supports the piston valve 80 via a piston rod 82 (transmission body). The joint portion 94 functions as a combination portion that combines the lever 96 with the stay 90 so as to be rotatable.

  In the arc-shaped cylinder pump 76 of the present embodiment, the cylinder 4 is formed in a semicircular arc shape, and the piston rod 82 has a circumference including the cylinder axis P2 (FIG. 3) of the cylinder 4 around the center of the cylinder 4. It functions as a rotary pump that rotates up. According to such an arc-type cylinder pump 76, when the piston rod 82 is pulled during use, the cylinder 4 and the piston rod 82 form a substantially annular shape around the center of the cylinder 4. Unlike a straight cylinder pump, it does not require a straight space and can be used compactly.

  Further, the piston rod 82 and the cylinder 4 are combined via the lever 96, the shaft 92, and the stay 90 so that the piston rod 82 does not run out of the cylinder 4. Therefore, stable operation is possible.

Further, the nigiri 100 in the lever 96 corresponds to the lever's power point, the joint portion 94 corresponds to the lever's fulcrum, and the extending portion 97 corresponds to the lever's action point. Therefore, the circular arc cylinder pump 76 of the present embodiment can push the piston rod 82 by the action of the lever. Therefore, in the conventional straight type cylinder pump, when a positive pressure is generated in the cylinder by pushing the piston rod, the pressure acts on the piston rod as a reaction. Accordingly, the piston rod 82 can be pushed in with a small force. Further, the distance from the center of the joint portion 94 to the connecting portion with the piston rod 82 is L ₁ , the force applied to the piston rod 82 is f _1, and the distance from the center of the joint portion 94 to the edge 100 is L ₂ , depending on the user. when the force applied to the grip 100 and the _{f 2,} the relationship _{f 1 × L 1 = f 2} × L 2 is satisfied. Then, it obtained from the relational expression as _{f 2 = f 1 × L 1} / L 2. Accordingly, as L ₂ is longer than L ₁ , the user's force is smaller. That is, as the lever 96 is longer than the turning radius of the piston rod 82, the operation of the pump can be saved.

  Furthermore, the circular arc cylinder pump 76 of the present embodiment can be installed on the bicycle 78 and always carried. Therefore, air can be put in regardless of time and place.

  The present invention may be appropriately modified from the above-described embodiments.

(1) The material of the cylinder or piston rod is not particularly limited, and can be determined according to the application of the arc cylinder pump, such as metal or plastic.

(2) The cylinder is not limited to a semicircular arc or a superior arc, and the cylinder may be inferior arc. Further, the cylinder diameter and cylinder length of the cylinder are not particularly limited, and can be determined according to the use or installation location of the arc cylinder pump. Moreover, the form of a piston and the length of a piston rod can be defined according to the cylinder diameter and cylinder length of a cylinder.

(3) The pair of base bodies 12a and 12b is not limited to the disk shape, and various shapes such as a polygonal shape can be employed.

(4) Known shaft parts and bearing parts can be used for the combination parts 14a and 14b.

(5) The arc cylinder pump 2 according to the first embodiment may be one in which the bellows tube 50 used in the second embodiment is loaded in the cylinder 4.

(6) In the circular arc cylinder pump 44 according to the second embodiment, the piston 7 is not an essential configuration, and may be an aspect in which the piston 7 is omitted.

(7) You may provide the valve which prevents the back flow of the fluid discharged from the cylinder inside the cylinder port 24 provided at the front-end | tip of the cylinder, the nozzle cap 60, and the cap 107.

  The present invention can be carried out in various modifications, corrections, and modifications based on the knowledge of those skilled in the art without departing from the spirit of the present invention, and all of these aspects belong to the scope of the present invention. is there.

  For example, in the arc cylinder pump 44 according to the second embodiment, the slit 54 may be closed while interlocking with the movement of the piston rod 48 to improve the airtightness in the cylinder 46. As an example, if the outer periphery of the combination part 14b is formed so as to be in contact with the cylinder 46, the slit 54 is blocked by the outer periphery of the combination part 14b and the airtightness is improved.

2, 44, 76 ... Arc type cylinder pumps 4, 46 ... Cylinders 6, 7, 80 ... Pistons 8, 48, 82 ... Piston rods 12a, 12b ... Base bodies 14a, 14b ... Combination part 50 ... Bellows tube 96 ... Lever P2, P3 ... Tube axis

Claims (3)

A cylinder with a cylindrical shaft formed in an arc shape;
A piston disposed in the cylinder;
A transmission body that rotates along the cylinder around an arc center formed by the cylindrical shaft by an external force, and transmits the external force to the piston;
A cylinder support for supporting the cylinder;
A piston support that supports the piston via the transmission body;
Equipped with a,
An arc cylinder pump characterized in that the piston support is combined with the cylinder support so as to be rotatable around the circle center . The piston support is
A combination part to be combined with the cylinder support;
An extending part that extends in a radial direction of the circle including the arc from the combination part, and the external force is applied to the tip part;
With
The arc cylinder pump according to claim 1 , wherein the extending portion extends longer than a radius of the arc. A cylinder with a cylindrical shaft formed in an arc shape;
A cylindrical container having a body portion that is arranged in the cylinder and in which a bellows is formed that can expand and contract in the length direction;
A transmission body that rotates along the cylinder around the center of an arc formed by the cylindrical shaft by an external force, and transmits the external force to the bottom of the cylindrical container;
Arc cylinder pump with

Images