JP3402445B2 - Chilled out cylinder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder used for a frozen dessert dispensing device such as ice cream and yogurt.

[0002]

2. Description of the Related Art Conventionally, an ice cream dispenser as shown in FIG. 12 is known. this is,
In a freezer compartment 102 equipped with a cooler 101, a pouring cylinder 105 in which a piston 104 is slidably fitted in a cylinder 103 is vertically provided, and a cap 106 is attached to an opening at an upper end of the cylinder 103. By being
An accommodating chamber 107 for accommodating the ice cream pack B is formed on the upper surface side of the piston 104.
The pressure chamber 110 is formed on the lower surface side of the piston 104 while being connected to the pouring portion 109 including Then, the pump 111 is driven to supply the working fluid x to the tank 112.
When it is supplied to the pressure chamber 110 from the above, the piston 104 rises and the pack B is compressed, and the pouring cock 108 is opened, so that the ice cream in the pack B is poured out.

[0003]

In the pouring cylinder 105 of this type, the sealing property around the piston 104 is an important issue in order to prevent the working fluid x from leaking. In particular, when the ice cream is poured out as described above, the hardness of the ice cream packed in the pack B is not always uniform over the entire area, so that the piston 104 may tilt during pressurization. It can be said that it is a form of use in which leakage easily occurs. Therefore, in order to ensure a reliable seal,
There is a problem that high standards are required for the clearance between the cylinder 103 and the piston 104, the selection of the material of the piston ring 113 fitted on the outer periphery of the piston 104, and the like, which causes a rise in manufacturing cost. The frozen dessert pouring cylinder of the present invention has been completed under the circumstances described above, and its purpose is to improve the sealing performance around the piston.

[0004]

As a means for achieving the above object, the invention of claim 1 stores a frozen dessert in one side of a piston slidably fitted in a cylinder, and the piston is In a frozen dessert pouring cylinder configured to dispense a frozen dessert by supplying a working fluid to a pressure chamber provided on the other side and pressurizing the working fluid, the working fluid is provided on an end surface of the pressure chamber facing the piston. With the supply port, on the pressure receiving surface of the working liquid in the piston,
It is characterized in that a recess having a depth reaching at least near the mounting position of the piston ring is formed.

According to a second aspect of the present invention, in the first aspect of the present invention, the piston ring is mounted near a central position in a sliding direction of a sliding contact portion of the piston that slidably contacts an inner peripheral surface of the cylinder. There is a feature in that.
The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, a groove is formed on a pressure receiving surface side of a portion of the piston ring projecting from the outer peripheral surface of the piston. According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the inner wall of the recess is opened at a position on the outer peripheral surface of the piston that is closer to the pressure receiving end than the mounting position of the piston. The feature is that the through holes are formed.

[0006]

When [Action and Effect of the Invention hydraulic fluid body to the pressure receiving surface of the piston <invention of claim 1> is supplied, attachment portion of the piston ring acts the pressure in the peripheral surface of the recess is enlarged. Therefore, sealing is achieved in a state where the piston ring is firmly pressed against the inner peripheral surface of the cylinder. According to the present invention, even if the piston is tilted, reliable sealing can be achieved. Further, the clearance between the piston and the cylinder, the material of the piston ring, and the like can be selected somewhat roughly, and the manufacturing cost can be reduced.

<Invention of Claim 2> When the piston is tilted and separated from the inner peripheral surface of the cylinder on one side of the outer peripheral surface of the piston, the amount of separation is at a position closer to the center than the end in the axial direction. The smaller one. Since the piston ring is mounted at a position closer to the central portion, it is possible to keep the reduction in the pressing margin of the piston ring small. Spread an outer wall of the groove pressure of the hydraulic fluid body into the groove and piston ring <invention of claim 3> acts, because pressed against the inner peripheral surface of the cylinder, further sealing property increases. It is possible to prevent the air accumulation between the outer surface and the inner circumferential surface of the cylinder of the piston in the pressure-receiving end than the piston rings <invention of claim 4>.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an ice cream dispenser will be described below with reference to the accompanying drawings. <First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. First, the overall structure will be described with reference to FIG. Reference numeral 1 is a freezer consisting of a heat insulating box, a freezing chamber 2 is provided inside, and a heat insulating door 3 that can be opened and closed is provided on the front surface. A machine room 5 is provided on the bottom side of the freezer 1, and leg pieces 6 are provided.
Is installed through. At the ceiling portion of the freezer compartment 2, a cooler 8 connected to a refrigerator 7 installed in the machine room 5
And an internal fan 9 are installed, and the internal air sucked through a duct 10 provided at the back of the freezer compartment 2 is heat-exchanged while passing through the cooler 8 to generate cool air. The cold air generated is circulated and supplied into the freezer compartment 2 by the internal fan 9. As a result, the inside of the freezer compartment 2 is maintained at a cooling temperature such that the ice cream A is cooled and stored while maintaining the pourable state.

On the front side of the freezer compartment 2 is a fluid pressure cylinder 1.
1 is arranged vertically. This fluid pressure cylinder 11
Is a piston in which a piston 13 is tightly and slidably fitted in a cylinder 12, and a working fluid is a brine X.
It is (antifreeze). A cap 22 is detachably attached to the upper end of the cylinder 12, a pack accommodating chamber 20 is formed between the cap 22 and the upper surface of the piston 13, and a pressure chamber 24 for supplying and discharging the brine X to and from the lower surface of the piston 13. Is configured.

The structure of the fluid pressure cylinder 11 is further shown in FIG.
3 will be described in detail. The cylinder 12 further includes a long lower cylinder 51 and a short upper cylinder 52. The upper cylinder 52 is the lower cylinder 51
Compared to the outer diameter dimension, the outer diameter dimension is the same and the inner diameter dimension is smaller, and the fitting protrusion 53 is formed on the outer periphery of the lower end portion of the upper cylinder 52, and is fitted around the upper edge portion of the lower cylinder 51. It is integrally connected by being fitted and welded in the provided fitting recess 54. The stepped portion 55 formed in the connecting portion restricts the piston 13 from rising more than a predetermined amount when the peripheral edge of the upper surface of the columnar portion 57 in the piston 13 described later abuts.

One of the pistons 13 has a short cylindrical portion 5
A circular truncated cone portion 58 is formed continuously at the center of the upper surface of 7. An escape space 58A is formed between the peripheral surface of the truncated cone portion 58 and the inner peripheral surface of the cylinder 12. On the outer peripheral surface of the columnar portion 57, two upper and lower circumferential grooves 60 are formed with a space therebetween, and the piston ring 14 is fitted in each of them. Further, a hollow hole 59 having a circular cross section is formed in the center of the lower surface of the columnar portion 57.
The ceiling surface of the hollow hole 59 is located higher than the upper circumferential groove 60.

The upper cylinder 52 of the cylinder 12 described above.
A vertical U groove 21 is cut from the upper edge of the wall surface corresponding to the heat insulating door 3 in FIG. Therefore, the pack storage chamber 2
An elastic pack B in which the ice cream A is enclosed can be stored in the slot 0 while the outlet C thereof is fitted into the U groove 21. The cap 22 is an upper cylinder 52
The bottom surface of a thick disk portion 63 that can be fitted into the upper end portion of the circular cone has a shape in which a truncated cone portion 64 is connected downward. An escape space 64A is formed between the peripheral surface of the truncated cone portion 64 and the inner peripheral surface of the cylinder 12. A handle 65 is provided on the upper surface of the cap 22 and the disc portion 6
On the outer peripheral surface of 3, three pins 66 are provided so as to project at 120-degree intervals. On the other hand, three locking grooves 67 are formed in the upper cylinder 52 at equal angular intervals. The locking groove 67 is called a J slot, and has a shape that is cut downward from the upper edge and further cut in one direction in the circumferential direction. Therefore, the cap 22 is fitted in the retaining state by pushing the pins 66 in line with the entrances of the locking grooves 67 and then rotating them clockwise in FIG.

A flange 69 is fixed to the outer periphery of the lower end of the cylinder 12 by welding, and a bottom plate 70 is fixed to the lower surface of the cylinder 69 by screws. The fluid pressure cylinder 11 having the above-described structure has the hinge 16 on the back surface side of the heat insulating door 3.
It is placed and fixed on a support plate 17 provided via the, and an intermediate position in the length direction is held by two belts 18 also provided on the back side of the heat insulating door 3,
It is arranged vertically as described above.

A tank 25 for storing the brine X is provided on the inner side of the bottom of the freezer compartment 2. This tank 25
Ports 26 and 27 are opened on the bottom surface of the pressure chamber 24 and the pressure chamber 24, respectively, and the ports 26 and 27 are connected to each other by a brine channel 28 that is piped in the machine chamber 5. Is a reversible pump 29 that drives in both forward and reverse directions.
Is installed. That is, when the reversible pump 29 is driven in the forward direction, the brine X in the tank 25 is supplied to the pressure chamber 24 of the fluid pressure cylinder 11, while when it is driven in the reverse direction, the brine X in the pressure chamber 24 is on the tank 25 side. It is supposed to be returned to. The pressure chamber 24 and the tank 25 are connected by another air vent pipe 30, and the solenoid valve 30A interposed there is always closed.

The heat insulating door 3 is provided with a pouring portion 35 for the ice cream A. In detail, in the mounting hole 36 formed in the heat insulating door 3, a cylindrical body 37 having a closed front surface is provided.
Of the horizontal tube is fitted with a clearance, and the opening of the horizontal tube is connected to the outlet C of the pack B. Further, the upper and lower ends of the vertical pipe respectively penetrate the cylindrical body 37 and project vertically, and the lower end serves as a spout 40 and the spout cock 41 is provided on the upper end side. Pour cock 41 is lever 4
The valve body 43 is raised and lowered by the turning operation of 2, and the pouring port 40 is opened by turning the lever 42 from the chain line position in FIG. 1 to the solid line position.

Further, the pouring portion 35 on the surface of the heat insulating door 3
A normally open type micro switch 45 for controlling the start-up and stop of the motor (not shown) of the above-described reversible pump 29 for supplying brine in the forward direction is provided at a position above. The operation plate 4 is attached to the valve body 43 of the pouring cock 41.
6 is provided to open the spout 40.
When is raised, the operation plate 46 presses the actuator to turn on the micro switch 45. A mounting table 48 on which a container for the ice cream A is placed is provided below the pouring portion 35 on the front surface of the heat insulating door 3.

The first embodiment has the structure as described above, and its operation will be described subsequently. To dispense the ice cream A, a container (not shown) is placed on the mounting table 48, and the lever 42 of the dispensing cock 41 is rotated to the position indicated by the solid line in FIG. 1 to open the spout 40. Since the micro switch 45 is turned on accordingly, the reversible pump 29 is driven in the forward direction. Then, as shown by the solid arrow in FIG.
The brine X inside is pumped up and supplied into the pressure chamber 24 of the fluid pressure cylinder 11 to be pressurized. As a result, the piston 13 rises to compress the pack B, the ice cream A flows out from the outlet C of the pack B, and is poured into the container from the pouring outlet 40. When an appropriate amount is dispensed, the lever 42 of the dispensing cock 41 is rotated to the position shown by the chain line in FIG. 1, the micro switch 45 is turned off, the reversible pump 29 is stopped, and the spout 40 is closed to dispense. Is stopped. By repeating the above, the ice cream A is sequentially poured out.

When the ice cream A in the pack B is used up as the pouring proceeds, the pack B is replaced with a new one. In that case, the procedure is as follows. When a pack exchange switch (not shown) is turned on, the reversible pump 29 is driven in the reverse direction, so that the brine X in the pressure chamber 24 of the fluid pressure cylinder 11 is sucked, as indicated by the dashed arrow in FIG. It is returned to the tank 25. As a result, the inside of the pressure chamber 24 leans to a negative pressure, the piston 13 descends, and the pack accommodating chamber 20 expands greatly. When the piston 13 descends until it hits the bottom surface of the cylinder 12, the reversible pump 29 stops. Then open the insulation door 3 and remove the cap 22,
By taking out the used pack B and accommodating a new pack B in place of it, the pouring operation can be performed again.

Here, since the hollow hole 59 is formed in the lower surface of the piston 13 in the fluid pressure cylinder 11, when the brine X is supplied to the pressure chamber 24 during pouring, the arrow line in FIG. As shown in FIG.
In addition to the force that raises, the force that presses the peripheral surface of the hollowed hole 59 acts. When such a force acts, the cylindrical portion 5
7 acts to spread the outer peripheral surface of the cylinder 7 outward, and the outer periphery of the piston 13 to which the piston ring 14 is mounted
It is firmly pressed against the inner peripheral surface of. Therefore, even if the piston 13 is slightly inclined, the brine X is
It is surely prevented from leaking to the upper surface side of the. Further, a truncated cone portion 58 is formed on the upper surface side of the piston 13,
Since the space between the peripheral surface and the inner peripheral surface of the cylinder 12 is widened to form the escape space 58A, the edge D at the bottom of the pack B filled with the ice cream A is also escaped into the escape space 58A. And it doesn't bite.

Further, the pressing surface that actually applies the compressive force to the pack B of the ice cream A is the upper surface of the truncated cone portion 58 of the piston 13, and the area of this pressing surface is the brine on the lower surface side of the piston 13. It is smaller than the area of the pressure receiving surface that receives the pressure of X. Therefore, when the pressure of the brine X acts, a large pressing force inversely proportional to the area is obtained on the pressing surface. In other words, when it is desired to obtain a predetermined pressure when compressing the pack B, the pressure of the brine X can be suppressed to be small, and the reversible pump 29 having a small capacity can be used.

Further, for example, when the piston has a mere circular cross section, when the pack B is compressed, it is not always folded from the bottom side, and it may be folded from any position. Therefore, there is a possibility that the vicinity of the outlet C may be folded first to block the outlet C. In this respect, with the structure in which the truncated cone portion 58 is provided on the piston 13 as in the present embodiment, the central portion of the bottom surface of the pack B is mainly pressed, and the peripheral portion is pressed accordingly. Therefore, as shown in FIG. 2, the pack B is compressed by being sequentially folded from the bottom side. Therefore, it is possible to avoid that the vicinity of the outlet C of the pack B is folded first and the outlet C is closed.

A frustoconical portion 64 is also formed on the lower surface side of the cap 22, and the clearance between the peripheral surface and the inner peripheral surface of the cylinder 12 is widened to form an escape space 64A. The upper end side of B is not released into the escape space 64A and is not caught. Therefore, the cap 22 can be opened and closed smoothly.

<Second Embodiment> FIG. 4 shows a second embodiment of the present invention. In the second embodiment, the hollow hole 72 formed in the lower surface of the piston 71.
The shape has been changed. The hollowed hole 72 has a hemispherical shape on the upper side, and its ceiling reaches a position higher than the fitting position of the piston ring 14. A C surface 73 is formed at a corner of the upper surface of the piston 71, and an escape space 73A is formed between the piston 71 and the inner peripheral surface of the cylinder 12. Also in this second embodiment, when the brine X is supplied to the pressure chamber 24, as shown by the arrow in the figure, a force acts to spread the fitted portion of the piston ring 14 to the outside, The sealability can be improved.

If the hollow hole 72 has a hemispherical shape on the ceiling side, on the upper surface of the piston 71, the central portion and the peripheral portion have different upward acting forces, and therefore the piston 71 is less likely to tilt. Become. The shape of the hollowed hole is not limited to the shape shown in the first and second embodiments, and in short, the force of expanding the fitting portion of the piston ring in the piston under the pressure of the brine X is applied. Any shape is acceptable.

< Reference Example > FIG. 5 shows a reference example . In this reference example , the shape of the upper surface of the piston 76 is changed. That is, the upper surface 77 that is the pressing surface of the piston 76 has a spherical shape. As a result, the upper end of the piston 76 and the cylinder 12
Relief space 77A between has been configured.

< Third Embodiment> A third embodiment of the present invention will be described with reference to FIGS. 6 and 7. The piston 81 of the third embodiment has a shape in which a diameter-reduced upper cylindrical portion 84 is formed in a stepped shape at the center of the upper surface of a lower cylindrical portion 83 having a hollowed hole 82 formed in the lower surface, Between the upper cylindrical portion 84 and the inner peripheral surface of the cylinder 12,
A cylindrical escape space 84A is formed. It should be noted that the upper and lower circumferential grooves 60 are similarly formed on the outer peripheral surface of the lower cylindrical portion 83 with a space therebetween, and the piston rings 14 are fitted to the respective circumferential grooves 60. According to the piston 81 of this embodiment,
The part of the pack B where the edge D is easily caught retreats to the deep part of the bottom of the escape space 84A, so that no jam occurs. Further, as shown in FIG. 7, the lower end of the pack B is
By mainly folding in the narrow escape space 84A, that is, by reducing the folded portion of the pack B, the amount of ice cream A remaining in that portion can be reduced, and the ice cream A can be reduced. It is possible to pour more efficiently.

< Fourth Embodiment> A fourth embodiment of the present invention will be described with reference to FIGS. The piston 91 of the fourth embodiment has the following structural features. As a whole, as shown in FIGS. 8 and 9, a low columnar sliding contact portion 92 is provided on the lower side, and a frustoconical shape whose diameter is gradually reduced toward the upper end is provided at the center of the upper surface. The pressurizing portion 93 is formed in a stepped manner. An escape space 93A having a deep bottom is formed between the peripheral surface of the pressurizing portion 93 and the inner peripheral surface of the cylinder 12. Further, the pressing portion 93 having a truncated cone shape means that the outer peripheral edge of the upper end of the pressing portion 93 escapes toward the center side in the radial direction. On the other hand, a hollow hole 94 having a circular cross section is formed in the center of the lower surface of the sliding contact portion 92. The hollowed-out hole 94 has an inner diameter substantially equal to the diameter of the upper end of the pressurizing portion 93, and the ceiling surface reaches the upper end of the sliding contact portion 92.

A circumferential groove 95 is cut on the outer peripheral surface of the sliding contact portion 92 at a position above the center height thereof, and a piston ring 96 is fitted therein. As shown in FIG. 10, when the piston ring 96 is fitted in the circumferential groove 95, it projects from the outer peripheral surface of the sliding contact portion 92. A groove 96A having a substantially semicircular cross section is formed over the entire circumference. Further, below the fitting position of the piston ring 96,
While another circumferential groove 97 is formed, four through holes 98 that open to the circumferential groove 97 are formed in the inner wall of the above-described hollowed hole 94 at intervals of 90 degrees.

Next, a description will be given of special operational effects based on the characteristics of the above structure. When the pouring progresses and the piston 91 approaches the raised position, for example, as in the fourth embodiment, the shape of the piston 81 is the lower cylindrical portion 83 and the upper cylindrical portion 8.
4 and 4 are connected in a stepped manner, the flange portion E of the outlet C of the pack B (the portion bonded to the sheet)
When the upper end of the piston 81 hits the piston 81 and the piston 81 further rises, there is a risk that the piston 81 tilts with the hit portion as a fulcrum. In that respect, according to this embodiment, the pressurizing portion 93 of the piston 91 is formed in a truncated cone shape whose diameter is gradually reduced toward the upper end, that is, the outer periphery of the upper end of the pressurizing portion 93 escapes to the radial center side. Therefore, as shown in FIG. 8, even when the piston 91 approaches the rising position, there is no risk of hitting the flange portion E at the outlet C of the pack B, and even when the piston 91 reaches the rising position, the flange portion E Piston 91 caused by hitting the
Is prevented from tilting.

On the other hand, even if the piston 91 is inclined, the mounting position of the piston ring 96 according to this embodiment is advantageous in terms of sealing performance. That is, as shown by the solid line in FIG. 11, when the piston 91 is inclined, for example, the lower side on one side (left side in the figure) of the outer peripheral surface of the sliding contact portion 92 is
Although separated from the inner peripheral surface of the cylinder 12, the distance b at the center height position is smaller than the distance a at the lower end position of the sliding contact portion 92. In this embodiment, the sliding contact portion 92
Since the piston ring 96 is fitted slightly above the center height position of the piston 91, as compared with the case where the piston ring 96 is fitted to the lower end of the sliding contact portion 92, as described above, Even when is tilted, the floating amount of the piston ring 96 is kept small, and the pressing margin of the piston ring 96 can be secured. Therefore, a high sealing property can be obtained. Also, the piston ring 96
Since a concave groove 96A is formed on the lower surface of the portion of the sliding contact portion 92 protruding from the outer peripheral surface of the sliding contact portion 92, when the brine X is supplied to the pressure chamber 24 during pouring, the concave portion of the piston ring 96 is depressed. When pressure is applied to the groove 96A, the groove 96A acts to spread the outer wall of the groove 96A outward. That is, the outer wall of the recessed groove 96A is firmly pressed against the inner peripheral surface of the cylinder 12, and the sealing performance is secured even if the piston 91 is slightly inclined.

In addition, in this type of ice cream dispenser, when it is operated for the first time after installation,
Explaining with reference to FIG. 1, the air remains in the discharge side pipe of the pump 29 and the lower surface side of the piston 13. When the pouring operation is performed from such a state and the brine X is supplied to the pressure chamber 24, the remaining air is also collected together with the pressure chamber 2
However, since the air is a compressible fluid, the air is first compressed to the limit and then pressurized by the brine X so that the piston 13 rises. The 13 ascending movements become less stable. For example, there is a problem that it is not possible to easily cope with the case where the operation time of the pump 29 is controlled to carry out a fixed amount dispensing.

Therefore, in the above-described first embodiment, when the pressure chamber 24 and the bottom surface of the tank 25 are connected by the air vent pipe 30, the inlet on the pressure chamber 24 side is when the piston 13 reaches the lowered position. Is provided so as to project to a height position where a slight gap is opened below the ceiling surface of the hollow hole 59 of the piston 13, and a normally closed solenoid valve 30A is provided in the middle of the air vent pipe 30. . And, in the case where it operates for the first time after installation, the reversible pump 29 is opened by opening the pouring cock 41 and turning on the micro switch 45.
Is driven in the forward direction to supply the brine X from the tank 25 to the pressure chamber 24 side, and the solenoid valve 30A of the air vent pipe 30 is opened. Then, the remaining air is pushed back to the lower surface side of the piston 13 along with the supply of the brine X, enters the inflow port from the ceiling portion of the hollow hole 59, passes through the air vent pipe 30, and is discharged into the tank 25. When the air is extracted from the pressure chamber 24 and the air vent pipe 30, the solenoid valve 30A is closed and the closed state is maintained thereafter. As a result, the pressure chamber 24 is filled with only the brine X, and when the brine X is supplied thereafter, the pressure of the brine X is properly received and the piston 13 is stably driven to rise. Is devised.

Here, in the fourth embodiment, as shown in FIG. 8, since the piston ring 96 is fitted at a position slightly higher than the central height of the sliding contact portion 92, the lower end of the sliding contact portion 92 is formed. A ring-shaped deep gap S is formed between the side and the inner peripheral surface of the cylinder 12, and air also accumulates therein. Even if the brine X is first supplied to bleed air as described above, the gap S is blocked from the hollow hole 94, and it is difficult to bleed air from the gap S. In that respect, in the present embodiment, since the through hole 98 opened from the inner wall of the hollowed hole 94 to the outer surface of the sliding contact portion 92 is formed, when the brine X is supplied to perform the air bleeding as described above, The air accumulated in the gap S also escapes to the hollow hole 94 side through the through hole 98, and can be extracted to the outside by the air vent pipe 30.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition to the above, various modifications can be made without departing from the scope of the invention. (1) The present invention can also be applied to using liquid other than brine as a working fluid for dispensing cylinder. (2) The ice cream referred to in the above embodiment includes both soft ice cream and hard ice cream, and the present invention can be widely applied to all other frozen dessert dispensers such as yogurt and sorbet. Is possible.

[Brief description of drawings]

FIG. 1 is a sectional view showing an entire structure of an ice cream dispenser according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway sectional view of a fluid pressure cylinder.

FIG. 3 is a partially cutaway exploded perspective view thereof.

FIG. 4 is a partial sectional view of a fluid pressure cylinder showing a piston according to a second embodiment of the present invention.

FIG. 5 is a partial sectional view of a fluid pressure cylinder showing a piston of a reference example .

FIG. 6 is a partial sectional view of a fluid pressure cylinder showing a piston according to a third embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of the state in which the pouring is advanced.

FIG. 8 is a partial sectional view of a fluid pressure cylinder showing a piston according to a fourth embodiment of the present invention.

FIG. 9 is a front view of the piston

FIG. 10 is a partially enlarged sectional view showing the shape of the piston ring.

FIG. 11 is a schematic sectional view showing a tilted state of a piston.

FIG. 12 is a sectional view of a conventional ice cream dispenser.

[Explanation of symbols]

A ... Ice cream B ... Pack X ... Brine 11
… Fluid pressure cylinder 12… Cylinder 13… Piston
14 ... Piston ring 20 ... Pack accommodation chamber 24 ... Pressure chamber 29 ... Pressurizing pump 57 ... Column part 59 ... Hollow hole 71 ... Piston 72 ... Hollow hole 81 ... Piston 82 ... Hollow hole 91 ... Piston 92 ... Sliding contact portion 94 ... Hollow hole 96 ... Piston ring 96A ...
Groove 98 ... through hole S ... gap

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Iwata 16-3 Hoshizaki Electric Co., Ltd., South Building, Sakaemachi, Toyoake City, Aichi Prefecture (56) References JP-A-3-297354 (JP, A) (58) Survey Areas (Int.Cl. ⁷ , DB name) A23G 1/00-9/30

Claims (4)

(57) [Claims] 1. A frozen dessert is housed in one side of a piston slidably fitted in a cylinder, and a working liquid is supplied to a pressure chamber provided on the other side of the piston to pressurize the frozen dessert. In a frozen dessert dispensing cylinder adapted to dispense, a port for supplying the working liquid is provided on an end face of the pressure chamber facing the piston, and at least a piston ring is mounted on a pressure receiving face of the working liquid in the piston. Cylinder for pouring frozen desserts, characterized in that a recess having a depth reaching the vicinity of the position is formed. 2. The piston ring is mounted near a central position in a sliding direction of a sliding contact portion of the piston that slidably contacts an inner peripheral surface of the cylinder. Cylinder for pouring frozen desserts. 3. The frozen dessert cylinder according to claim 1, wherein a groove is formed on the pressure receiving surface side of the portion of the piston ring projecting from the outer peripheral surface of the piston. . 4. The inner wall of the recess is formed with a through hole that opens at a position closer to the pressure receiving end than the mounting position of the piston on the outer peripheral surface of the piston. Cylinder for pouring frozen dessert according to claim 2 or 3.