JP3041975U - Portable tire attaching / detaching device - Google Patents

Abstract

The present invention relates to a portable tire attaching / detaching device, which is small, can be disassembled into several parts, is easy to assemble, has a small installation space, is portable, and is small in size. Delivers high output and efficiently attaches and detaches rims to and from tires. A support ring (6) having a short diameter is provided between a base body (1) provided with a cylinder (2) substantially in the center and a locking nut (5) screwed to an operating screw (4) detachably attached to a piston (3) of the cylinder. In addition, the presser ring 9 and the long diameter presser ring 10
Rim 8 by selecting and arranging
Install and remove.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a portable tire attaching / detaching device, for example, when a solid tire used as a tire of an industrial vehicle such as a forklift truck is old and needs to be replaced, the rim is removed from the tire or the rim is removed. It is used to put on.

[0002]

[Prior art]

BACKGROUND ART Conventionally, there is a solid tire shown in FIG. 10 which is used for an industrial vehicle such as a forklift. That is, a tire main body a made of rubber, an upper rim b on both left and right sides of the tire main body a, and a lower rim b ′ superposed on the upper rim b and joined by a bolt c and a nut d are formed. there were. In this tire, when the upper rim b and the lower rim b ′ are attached to the tire main body a, the inner diameter of the tire main body a is set to the mounting seats b ₁ and b ′ ₁ of the upper rim b and the lower rim b ′. By forming the tire with a smaller diameter than the outer diameter, the elastic restoring force of the rubber for forming the tire main body a is utilized to exert a radial tightening force on the upper rim b and the lower rim b ′, The upper rim b and the lower rim b'are attached to the main body a. Further, recently, as another solid tire, as shown in FIG. 11, in order to eliminate the slippage of the attachment of the upper rim b and the lower rim b ′ to the tire main body a and to securely attach the rim to the tire main body a, By embedding a plurality of wires w inside the inner peripheral side of the main body a, the tightening force of the wires w is exerted on the upper rim b and the lower rim b ′ to securely attach the tire main body a. The ones that have been made popular. By the way, a device for mounting the upper rim b and the lower rim b'on the tire main body a, or for removing the upper rim b and the lower rim b'is not suitable for mounting and removing the rim in a solid tire. Requires a larger force than a pneumatic tire, a hydraulic cylinder is used as a drive source in a conventional gate-shaped frame, and the rim is removed and mounted by using the pressure of this hydraulic cylinder. There was a large stationary type that could structurally withstand the applied pressure of. Further, the conventional device is used only for either one of the device for mounting the rim on the tire body and the device for removing the rim from the tire body. In other words, there has never been a portable tire attachment / detachment device that has both functions of mounting the rim on the tire body and removing the rim from the tire body.

[0003]

[Problems to be solved by the device]

 The conventional stationary tire attaching / detaching device described above has a large size and a large output, but since it has a large number of parts, the manufacturing cost is high, and it occupies a considerable space for installation. Maintenance and management were also troublesome. Further, in the conventional solid tire shown in FIG. 11, the tightening force of the plurality of wires w embedded in the tire main body a is applied to the upper rim b and the lower rim b ′, so that the tire main body a is attached to both rims. Since it is attached without causing slippage, the upper rim b and the lower rim b'can be attached to or removed from the tire body a as shown in FIG. 10 by tightening the rubber of the tire body a. By utilizing the applied force, the tire main body a and the upper rim b and the lower rim b ′ are frictionally engaged with each other rather than the solid tire in which the upper rim b and the lower rim b ′ are attached to the tire main body a. However, a large output was needed to release the frictional engagement.

The present invention is small and can be disassembled into several parts and is easy to assemble, and it does not take up a lot of installation space and can be easily transported and moved to a desired place. In addition, the present invention also provides a portable tire attaching / detaching device that can produce a high output in spite of its small size, and can attach a rim to a tire efficiently.

[0005]

[Means for Solving the Problems]

 According to a first aspect of the present invention, a base main body, a cylinder provided substantially in the center of the base main body, a piston that is extendable and retractable in the cylinder, and an operating screw rod that can be attached to a lower end of the piston. In a portable tire attaching / detaching device including a locking nut screwed to the operating screw and a tire supported between the base body and the locking nut, the operating screw is detachable from a piston. Attached to the base body and the locking nut, the supporting ring of short diameter that supports the outer periphery of the rim, the pressing ring of short diameter that is mounted on the rim, and the pressing ring of long diameter that is mounted on the tire are attached. Between the tire and the tire.When mounting the rim, the supporting ring with the shorter diameter and the holding ring with the shorter diameter are used, and when the rim is removed, the supporting ring with the shorter diameter and the holding ring with the longer diameter. When to use ring It was adopted means.

According to a second aspect of the present invention, in the first aspect, a window hole into which a lever can be inserted from the outside is opened on the peripheral side surface of the pressing ring having a long diameter used when the rim is removed from the tire. A means of pulling out the upper rim from the tire by inserting the tip of the lever into the gap between the tire and the upper rim was adopted.

Further, the third aspect of the present invention adopts the means according to the first aspect, in which the base body is formed at a height of 300 mm or less from the floor lower than the waist of the worker.

According to a fourth aspect of the present invention, in the first aspect, the piston receives an upward biasing force by a coil spring interposed in the cylinder, and a vertically long oil feed provided in the peripheral wall of the cylinder. The means to lower the inside of the cylinder by the hydraulic pressure supplied through the hole was adopted.

According to a fifth aspect of the present invention, in the fourth aspect, an air booster pump is connected to the oil feed hole provided in the cylinder, and the air booster is provided when the piston that is vertically movable in the cylinder descends. A method was adopted in which the air pressure of the compressed air sent by the pump was converted to hydraulic pressure via a pressure booster cylinder to boost the pressure before refueling the cylinder.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A specific example of an embodiment of the present invention will be described below with reference to the drawings. An embodiment of the present invention will be described with reference to FIGS. Reference numeral A denotes a portable tire attaching / detaching device, which includes a base body 1, a cylinder 2 provided substantially in the center of the base body 1, a piston 3 which is extendably and contractably attached to the cylinder 2, and a lower end of which can be attached to and detached from the piston 3. Mounted on the rim 8, an operating screw 4 attached to the rim 8, a locking nut 5 screwed onto the operating screw 4, a supporting ring 6 having a short diameter for supporting the tire 7 through the outer circumference of the rim 8, and a rim 8. A holding ring 9 having a short diameter and a holding ring 10 having a long diameter mounted on the tire 7 are selectively arranged with respect to the tire 7 between the base body 1 and the locking nut 5. That is, when the rim 8 is mounted, the supporting ring 6 having a short diameter and the holding ring 9 having a short diameter are used, and when the rim 8 is removed, the supporting ring 6 having a short diameter and the holding ring 10 having a long diameter are used.

The base body 1 has a height h ₁ lower than the waist of an operator about 300 mm or less from the floor surface 12 by a plurality of leg portions 11 provided on the lower surface, for example, three leg portions 11 provided at equal angles in the circumferential direction. In the present embodiment, it is supported at a position approximately 200 mm above the floor surface 12.

The cylinder 2 has an inner peripheral diameter Φ ₁ of about 85 mm in this embodiment, and the upper portion 2 a is attached to the base body 1 so as to project therefrom. 2b is a oil feed hole provided vertically long in the peripheral wall of the cylinder 2, openings 2b ₁ provided at the lower end of the Okuaburaana 2b is faced downward outer periphery of the base body 1, also the Okuaburaana 2b The opening 2 b ₂ provided at the upper end faces the upper inner circumference of the cylinder 2.

The piston 3 has a substantially cylindrical shape, and the length l ₁ of the piston rod 3a is formed to about 70 mm, and the diameter Φ ₂ of the spill portion 3b is formed to about 85 mm. Reference numeral 3c is a female screw portion formed on the upper end portion of the piston 3, and an operation screw rod 4 described later is attached to the female screw portion 3c. Reference numeral 3d is a substantially annular stopper attached to the upper outer periphery of the piston 3, and the piston 3 descends against the biasing force of the coil spring 13 described below until the stopper 3d contacts the upper end of the cylinder 2. ing .

The operation screw rod 4 is formed with a male screw portion 4a on its outer circumference, its length l ₂ is about 600 mm, and its outer diameter Φ ₃ is about 36 mm. A handle 4b is formed on the upper end of the operating screw rod 4, and a handle 4c is provided on the handle 4b. When the rim 8 is attached or detached, the operating screw rod 4 is detachably attached by screwing a male screw portion 4a into a female screw portion 3c provided at the upper end of the piston 3.

The locking nut 5 screwed onto the male screw portion 4a of the operating screw rod 4 has a tubular portion 5a having a female screw portion 5a ₁ formed on the inner periphery and arranged above, and a tubular portion 5a of the tubular portion 5a. It is formed of a pressing plate portion 5b which is integrally formed below and which is substantially oval in a plane.

Reference numeral 13 is a coil spring interposed in the cylinder 2. The coil spring 13 is made of a steel material having a diameter of 7 mm or more, and urges the piston 3 upward. . Further, the piston 3 is lowered in the cylinder 2 by the oil pressure P ₂ supplied through the oil feed hole 2b provided in the peripheral wall of the cylinder 2 being received by the spill portion 3b.

In FIG. 8 and FIG. 9, 14 is an air booster pump connected to the oil feed hole 2b in order to obtain the oil pressure P _{2. The} air booster pump 14 has a known structure. It That is, for example, as shown in FIG. 1, this air booster pump 14 is provided with a compressor or a compressor not shown in the figure when an operator steps on a pedal 15 mounted on the upper surface so that the pedal 15 can be moved to the heel side. The air pressure P ₁ of the compressed air 17 is sent from the compression cylinder through the air supply hose 16 connected to the primary side through the opened regulating valve 18, and this air pressure P ₁ is supplied by the oil supply hose 19a to the air / boost pump 14 The oil supplied to the inside and stored inside is converted into hydraulic pressure P ₂ through the pressure increasing cylinder 20 installed in the air booster pump 14, and after being increased in pressure, it is transferred into the cylinder 2 through the oil supply hose 19b. The hydraulic pressure P ₂ is applied to lower the piston 3. Further, when the stepping on the pedal 15 is stopped, the adjusting valve 18 is closed, the air supply of the air pressure P _{1 to} the air booster pump 14 is stopped, and the pressure increasing cylinder 20 is returned to the neutral state. Further, when the oil in the cylinder 2 is desired to be returned, when the pedal 15 is caused to recede to the toe side, the adjusting valve 18 is opened and the path is changed as shown in FIG. Although the path of the pressure P ₁ is cut off, the compressed air 17 flows through the air supply hose 16 to the exhaust hose 15a via the air booster pump 14, and the oil in the cylinder 2 is lifted by the piston 3 to feed the oil supply hose 19b. It is designed to be returned to the air booster pump 14 and the oil supply hose 19a through the. In this way, the compressed air 17 sent from the compressor or the like using the air booster pump 14 is converted into the hydraulic pressure P ₂ via the pressure increasing cylinder 20 to increase the pressure before supplying the cylinder 2 with oil. This is because the piston 3 of the cylinder 2 is driven by the low air pressure P ₁ with high responsiveness and a high output, and the oil feed hole 2b is provided for the machining of the cylinder 2 which is necessary to move the piston 3 up and down. This is to simplify the hydraulic circuit by only doing this. Incidentally, in the present embodiment, when the air pressure P ₁ of about 5 to 8 kgf / cm ² is supplied to the air booster pump 14, the discharge pressure of the hydraulic pressure P ₂ into the cylinder 2 is about 720 kgf / cm ² , and the piston 3 It has a high output of 15 to 20 t / cm ² .

As shown in FIG. 1, 21 is interposed between the locking nut 5 and the pressing ring 9 when the rim 8 is mounted, and between the pressing ring 10 when the rim 8 is removed, if necessary. This spacer 21 is a spacer and is used to effectively transmit the pressing force from the locking nut 5 accompanying the driving of the cylinder 2 to the pressing rings 9 and 10 when the rim 8 is attached or detached. The rail-shaped pushing rods 22, 22 are arranged to face each other with the center as the center, and the pushing rods 22, 22 are formed in a substantially U-shape in plan view with one end thereof being a closed end.

In FIGS. 1 to 3, reference numeral 23 is a positioning adapter, and this adapter 23 is inserted into the bolt holes 24, 24 ... Between the upper rim 8a and the lower rim 8b overlapped with the upper rim 8a. A plurality of positioning pins 25 for positioning the set position of the upper rim 8a and the lower rim 8b by being provided are provided on the substrate 26.

An embodiment of the portable tire attaching / detaching device A of the present invention has the above-mentioned structure, and the mounting and removing of the rim will be described below in the order of steps. (A) Mounting of rim First, as shown in FIG. 1, the tire 7 is sandwiched by the lower rim 8b supported by the support ring 6 having a short diameter on the base body 1 and the pressing ring 9 having a short diameter. Is set between the locking nut 5 and the base body 1 which are screwed to the operating screw 4 around the operating screw 4 mounted on the piston 3 of the cylinder 2 provided substantially in the center of the base body 1. . Further, in the present embodiment, the spacer 21 is illustrated as being placed on the upper surface of the pressing ring 9, but the use of the spacer 21 is selectively used as necessary.

At this time, the positions of the lower rim 8b, the tire 7, and the upper rim 8a are set by positioning the lower rim 8b and the upper rim 8a with the bolt 24a and the nut 24b as shown in FIG. And bolts (not shown) protruding from the vehicle disk are inserted, and nuts are screwed together to attach the tire 7 to the disk. By inserting the positioning pin 25 provided on the positioning adapter 23 into the bolt holes 24 1, 24 ... Of a desired position among 24, the positioning of the lower rim 8b, the tire 7, and the upper rim 8a can be performed quickly and reliably. It may be performed. After that, the locking nut 5 screwed into the operating screw 4 is rotated and tightened until it comes into contact with the upper surface of the spacer 21, and the work of setting the necessary parts when mounting the rim 8 is completed.

After positioning the necessary work for mounting the rim 8 in this manner, the operator depresses the pedal 15 provided on the upper surface of the air booster pump 14 toward the heel side to maintain the lobe state. Then, as shown in FIG. 8, compressed air 17 is sent from the compressor or compression cylinder into the air booster pump 14 through the opened adjusting valve 18 through the air supply hose 16 connected to the primary side. The air pressure P ₁ of the compressed air 17 is supplied to the inside of the air booster pump 14 by the oil supply hose 19a and is increased with respect to the oil stored therein through the pressure increasing cylinder 20 installed in the air booster pump 14. It is converted into oil pressure P ₂ whose pressure, then pressure P ₂ is applied to the cylinder 2 through Okuaburaana 2b provided from the hydraulic P ₂ are feed oil hose 19b in the peripheral wall of the cylinder 2. As a result, the piston 3 is lowered in the cylinder 2 against the urging force of the coil spring 13 until the stopper 3d contacts the upper end of the cylinder 2 and further lowering is restricted. At this time, the piston 3 continues to descend while the foot of the pedal 15 is kept on the heel side.

Since the operating screw rod 4 also descends as the piston 3 descends, a short-diameter rod is inserted through the spacer 21 engaged with the lower surface of the locking nut 5 screwed to the male screw portion 4a of the operating screw rod 4. Since the upper rim 8a is pressed by the pressing ring 9, the upper rim 8a is fitted to the tire 7 made of rubber. At the same time, the lower rim 8b supported on the base body 1 by the support ring 6 having a short diameter is fitted to the lower side of the tire 7. In this way, the upper rim 8a and the lower rim 8b are superposed so as to sandwich the tire 7.

After that, the bolts 24a are inserted into desired bolt holes 24, 24 ... Of the upper rim 8a and the lower rim 8b, for example, the remaining bolt holes 24, 24 ... In which the positioning pin 25 is inserted. By screwing the upper and nuts 24b into the bolts 24a, the upper rim 8a and the lower rim 8b are assembled into the tire 7 to connect them. When the foot of the pedal 15 of the air booster pump 14 is stopped, the feeding of the compressed air 17 to the air booster pump 14 is stopped, and the supply of the hydraulic pressure P ₂ into the cylinder 2 is cut off. The booster cylinder 20 in the booster pump 14 returns to the neutral state.

Then, the handle 4b is gripped and the operating screw 4 is screwed back to the female screw portion 3c of the piston 3 to remove the operating screw 4 from the piston 3 (see FIG. 3). When the positioning adapter 23 is used, the rim assembly is removed from the support ring 6 of the base body 1 by pulling out the bolt holes 24, 24 of the upper rim 8a and the lower rim 8b from the positioning pin 25. Remove the tire 7 and complete the rim assembly.

(B) Removal of Rim A method of removing the rim 8 from the tire 7 will be described with reference to FIGS. 4 to 7. That is, this time, the tire 7 is supported by using the support ring 6 having a short diameter between the base body 1 and the locking nut 5 which is screwed to the operating screw rod 4 attached to the piston 3 of the cylinder 2. A holding ring 10 having a long diameter is placed on the pressing ring 7, and a spacer 21 interposed on the pressing ring 10 is engaged with the locking nut 5 if necessary when removing the rim 8. The necessary parts are assembled (see FIG. 4).

After that, the pedal 15 of the air booster pump 14 is depressed toward the heel side to move it downwards, and the hydraulic pressure P ₂ is supplied into the cylinder 2, so that the piston 3 resists the biasing force of the coil spring 13. When the inside of the cylinder 2 is lowered, the tire is pressed by a pressurizing ring 10 having a long diameter, which is engaged with a locking nut 5 screwed to an operating screw rod 4 which is engaged with a piston 3 via a spacer 21. Since 7 is deformed, a slight gap K ₁ is created between the upper rim 8a and the tire 7. Then the operator inserted before Symbol gap K ₁ generated between the tire 7 and the upper rim 8a of the tip portion of the lever R by insertion from the window hole 10a provided on the peripheral surface of the ring 10 pressing the lever R Moreover, the lever R is caused to sway in the direction of arrow A, and the lever action pulls out the upper rim 8a from the tire 7 (see FIG. 5).

At this time, since the base body 1 is formed at a height h ₁ of 300 mm or less from the floor surface 12, about 200 mm in this embodiment, which is lower than the waist of the operator, The work of pulling out the upper rim 8a from the tire 7 by R can be easily performed by applying unnecessary force without causing fatigue.

Then, the tightening of the locking nut 5 with respect to the operating screw 4 is loosened, the operating screw 4 is removed from the piston 3, the spacer 21 and the pressing ring 10 are removed from the tire 7, and then the tire 7 is removed. It is inverted and supported on the support ring 6 having a short diameter. Then, the long-diameter presser ring 10 is placed on the tire 7 again, and the spacer 21 is optionally provided on the presser ring 10 so that the operation screw rod 4 attached to the piston 3 is screwed. The necessary parts are assembled by locking the locking nut 5 (see FIG. 6).

After that, when the pedal 15 of the air booster pump 14 is stepped on the heel side again and the compressed air 17 is fed into the air booster pump 14 from the compressor as shown in FIG. 8, the air pressure of the compressed air 17 is increased. Since P ₁ increases the oil stored in the air booster pump 14 by the pressure increasing cylinder 20, the increased hydraulic pressure P ₂ is supplied to the cylinder 2 from the oil supply hose 19b and the oil supply hole 2b. , The piston 3 is lowered together with the operating rod 4 against the biasing force of the coil spring 13. In this way, the long diameter presser ring 10 engaged with the locking nut 5 screwed to the operating screw rod 4 presses the tire 7, and the lower rim 8b supported by the short diameter support ring 6. From the tire 7 (see Figure 7).

At this time, in this embodiment, the inner peripheral diameter Φ ₁ of the cylinder 2 is 85 mm, the diameter Φ ₂ of the spill portion 3 b of the piston 3 that can move up and down in the cylinder ₂ is 85 mm, and the air-boost pump is used. If the air pressure P ₁ of the compressed air 17 is fed from the compressor or the like 14, were pumped about 5~8kgf / cm ^2, pressure P ₂ fed to the cylinder 3 becomes about 720kgf / cm ^2, the piston 3 is It produces a high output of about 15 to 20 t / cm ² . Therefore, not only the tires 7 made of solid rubber having a relatively small tire diameter of 3 inches, 4 inches, and 5 inches, but also tires 7 having large tire diameters of 6 inches, 7 inches, and 8 inches can be easily installed on the upper side. The rim 8 can be easily removed from the rim 8a and the lower rim 8b. Further, in order to securely attach the tire 7 to the upper rim 8a and the lower rim 8b as shown in FIG. 11, a plurality of wires w are embedded inside the tire 7 so that the tightening force is increased. Even if the tire is of a type in which the tire is mounted so as to be exerted on the tire 7, the upper rim 8a or the lower rim 8b can be easily and surely removed from the tire 7.

After that, the operating screw 4 is screwed back from the piston 3 and removed, and the holding ring 10, the spacer 21, the lower rim 8 b, the tire 7, and the support ring 6 are removed from the base body 1.

Thereafter, when the pedal 15 of the air booster pump 14 is caused to sway to the toe side, the regulating valve 18 is opened and the course is changed as shown in FIG. 9, so that the air pressure P ₁ to the pressure increasing cylinder 20 is changed. , The compressed air 17 flows through the air supply hose 16 to the exhaust hose 15a via the air booster pump 14, the piston 3 rises by the biasing force of the coil spring 13, and the oil in the cylinder 2 It is returned to the old position from the air booster pump 14 to the oil supply hose 19a through the oil supply hose 19b. In this way, the work of removing the rim 8 from the tire 7 is completed.

[0034]

[Effect of the invention]

 As described above, according to the present invention, the outer periphery of the rim is provided between the base body and the locking nut that is screwed to the operating screw rod that is detachably attached to the piston of the cylinder provided at the approximate center of the base body. By selecting and arranging the supporting ring with a short diameter to support, the pressing ring with a short diameter that is mounted on the rim, and the pressing ring with a long diameter that is mounted on the tire, the overall size of the device can be reduced. High output is achieved, and the rim consisting of the upper rim and the lower rim can be easily attached to and removed from the tire and work efficiency can be improved. Also, a cylinder with a cylinder that allows the piston to move up and down is provided at the center, an operating screw that is attached to the piston, a locking nut that is screwed to the operating rod, a short-diameter support ring, and a long-diameter presser foot. Since it is made up of several parts such as rings, it is compact and easy to assemble and disassemble, easy to handle, and can be easily transported to and used in the required place, and the installation space is small. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a portable tire attaching / detaching device of the present invention in an assembled state when a rim is attached.

FIG. 2 is a sectional view showing a state in which the rim is also mounted on the tire.

FIG. 3 is a cross-sectional view of a state in which an operating screw rod, a pressing ring, and the like which also constitute this embodiment are removed from the base body.

FIG. 4 is a cross-sectional view showing an assembled state of parts when the rim is removed from the portable tire attaching / detaching device of the present invention.

FIG. 5 is a cross-sectional view showing a state in which the tip of the lever is inserted into a gap formed between the upper rim and the tire that is pressed by the long-diameter holding ring when the rim is removed by the portable tire attaching / detaching device of the present invention. It is a figure.

FIG. 6 is a cross-sectional view of the lower rim when the upper rim is removed and then the tire is inverted and assembled by the portable tire attaching / detaching device of the present invention.

FIG. 7 is a sectional view showing a state where the lower rim is removed by the portable tire attaching / detaching device of the present invention.

FIG. 8 is a circuit diagram showing a state where the pedal of the air booster pump constituting the present embodiment is depressed to the heel side to supply hydraulic pressure to the cylinder.

FIG. 9 is a circuit diagram of a state in which oil is returned from the inside of the cylinder by changing the passage of the adjusting valve of the air booster pump which also constitutes the present embodiment.

FIG. 10 is a cross-sectional view showing an example of a conventional solid tire.

FIG. 11 is a sectional view showing another example of a conventional tire in which a wire is embedded in the tire.

[Explanation of symbols]

1 Base Body 2 Cylinder 3 Piston 3b Spill Section 3d Stopper 4 Operating Screw 5 Locking Nut 6 Support Ring 8 Rim 8a Upper Rim 8b Lower Rim 9 Presser Ring 10 Presser Ring 13 Coil Spring 14 Air Booster Pump 15 Pedal K ₁ Gap P ₁ Air pressure P ₂ Hydraulic pressure R lever

Claims (5)

[Utility model registration claims] 1. A base main body, a cylinder provided substantially in the center of the base main body, a piston which is extendable and retractable in the cylinder, an operating screw rod whose lower end can be attached to the piston, and a screw which is screwed on the operating screw rod. In a portable tire attaching / detaching device comprising a locking nut to be fitted and a tire supported between the base body and the locking nut, the operating screw is detachably attached to a piston, and an outer periphery of a rim is attached. A supporting ring of a short diameter that supports the, a holding ring of a short diameter that is mounted on the rim, and a holding ring of a long diameter that is mounted on the tire with respect to the tire between the base body and the locking nut. The support ring having a short diameter and the holding ring having a short diameter are used when the rim is mounted, and the support ring having a short diameter and the holding ring having a long diameter are used when removing the rim. Allowed Portable tire attaching / detaching device. 2. A window hole into which a lever can be inserted from the outside is opened on the peripheral side surface of the pressing ring having a long diameter which is used when removing the rim from the tire, and the tip of the lever connects the tire and the upper rim. The portable tire attaching / detaching device according to claim 1, wherein the upper rim is pulled out from the tire by inserting the upper rim into the gap therebetween. 3. The portable tire attaching / detaching device according to claim 1, wherein the base body is formed at a height lower than a waist of an operator by about 300 mm or less from a floor surface. 4. The piston receives an upward urging force by a coil spring interposed in the cylinder, and is lowered in the cylinder by hydraulic pressure supplied through a vertically long oil feed hole provided in a peripheral wall of the cylinder. Claim 1 characterized by the above-mentioned.
3. The portable tire attaching and detaching device according to 1. 5. An oil feed hole provided in the cylinder is provided with air.
A booster pump is connected, and when the piston provided to be able to move up and down in the cylinder descends, the air pressure of the compressed air sent by the air booster pump is converted into hydraulic pressure via the pressure boosting cylinder to increase the pressure, The portable tire attaching / detaching device according to claim 4, wherein oil is supplied into the cylinder.