JPH0431110A - Changer for tubeless tire - Google Patents

Abstract

PURPOSE:To surely assemble both an upper and a lower bead section in a rim as well as to concurrently prevent the inner surface of a tire from being damaged by providing both a roller which allows the lower bead section of a tire to be assembled in the wheel rim, and a pawl section member which allows an upper bead section to be assembled in the wheel rim while the bead section is being pulled out in the outer diameter section. CONSTITUTION:A wheel 2 the axial center 'O' which is disposed perpendicularly, is supported on a wheel fixing stand 3 in such a way as to be freely rotated on the axial center 'O'. In this case, the lower bead section 4 of a tire 1 is assembled in a wheel rim 5 by means of a roller 6 while the upper bead section 7 of the tire 1 which is rested on the wheel 2 is a falling sideway shape, is being pressed downward during the rotation of the wheel 2. And a bead locking piece section 18 which is vertically provided roughly in parallel with the axial center of the wheel 2 in a pawl section member 8, is slidably brought into contact with the upper bead section 7 of the tire 1, and the upper bead section 7 is then assembled in the wheel rim 5 while the upper bead section 7 is being pulled out to the outer diameter direction during the rotation of the wheel 2.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a changer for tubeless tires.

[Prior art and problems to be solved by the invention] Conventionally, in a tubeless tire changer that is used with the tire placed on its side, the wheel is rotated around its axis while the tire is changed. The tire was assembled into the rim by simply pressing the bead portion downward with a roller.

However, in such a case, when the upper bead part is installed, the bead part C gets caught between the rim flange a and the roller b, damaging the inner surface of the tire d near the bead, as shown in Fig. 7. , the wheel could not be rotated.

Therefore, the present invention provides a changer for tubeless tires that allows the upper bead portion and the lower bead portion to be reliably assembled into the rim, and that does not damage the inner surface of the tire or prevent the wheel from rotating. The purpose is to

[Means to solve the problem]

In order to achieve the above-mentioned object ψ, the tubeless tire changer according to the present invention is provided with a tubeless tire changer that includes a wheel fixing base that holds a wheel whose axis is arranged vertically so as to be freely rotatable around the axis. In the changer for the above-mentioned wheel; a roller that presses the upper bead portion of the tire placed horizontally on the foil downward while the wheel is rotating so as to incorporate the lower bead portion of the tire into the wheel rim; It has a bead locking piece that is vertically disposed substantially parallel to the axis of the wheel, and the bead locking piece comes into sliding contact with the upper bead of the tire, so that during rotation of the wheel, the upper bead and a claw member for pulling the foil rim into the foil rim while pulling the foil rim in the outer diameter direction.

[For production]

When a tire is placed on its side on a wheel, and the upper bead of the tire is pressed downward by a roller, and the wheel is rotated, the upper bead is pressed downward. As a result, the lower bead portion is also pressed downward,
The lower bead is tucked into the foil rim. Next, the rotation of the wheel is stopped to separate the roller from the tire, and the claw member is moved to insert the bead locking piece between the upper bead and the rim flange. In the inserted state, the claw member is moved a short distance in a direction away from the foil to strongly arch the locking portion by the locking piece of the upper bead portion in the outer radial direction. If the foil is rotated in this state, the upper bead portion will be pulled in the outer diameter direction and inserted into the foil rim. In other words, the upper bit part does not get caught between the locking piece part and the rim flange, is smoothly incorporated, and does not make it impossible to rotate the wheel.

〔Example] Hereinafter, the present invention will be explained in detail based on drawings showing examples.

FIG. 1 shows a method of mounting a tire 1 on a wheel 2 using a tubeless tire changer according to the present invention,
This changer includes a foil fixing base 3 that holds the wheel 2, a roller 6 that incorporates the lower bead portion 4 of the tire 1 into the foil rim 5, and a claw member 8 that incorporates the upper bead portion 7 of the tire 1 into the foil rim 5. It is equipped with the following.

Thus, the foil fixing base 3 has a cylindrical shape, and the disk portion of the foil 2 is placed on the upper surface thereof, and is fixed with a bolt 50 using the hub hole of the disk portion so that the axis O is vertical. The foil 2 placed thereon is held rotatably around its axis O.

Further, the roller 6 has a truncated conical shape, and a roller holding rod 9 is connected to the base end of the roller 6. The base end of the roller holding rod 9 is connected to a cylindrical body 10, and the cylindrical body 10 has an upper and a lower pair. It is held in place by holding plates 11 and 12. That is, the cylindrical body 1
The axial center of 0 is the vertical axis (that is, parallel to the axial center of the foil 2), and the axial center of the cylindrical body 1O and the axes of the roller holding rod 9 and the roller 6 are perpendicular to each other. Note that the retaining plate 11
．． 12 is provided with through holes 13 and 14 that are coaxial with the cylindrical body 10 and have the same diameter.

Next, as shown in FIG. 4, the claw member 8 includes a main body part 16 protruding from the side wall of the cylindrical body 15, and a bead locking part connected to the main body part 16 via an inclined piece part 17. The cylindrical body 15 is placed on the holding plate 11, and in this state, the column 19 is inserted through the cylindrical body 15, and the cylindrical body 15 is placed on the holding plate ll.
1.12.

Here, the pillar 19 includes a cylindrical main body 19a, a disc-shaped body 19b connected to the top surface of the main body 19a, and a handle part 19c erected on the top surface of the disc-shaped body 19b. The main body part +9a is inserted into the cylindrical body 15 of the claw member 8, the through hole 13 of the retaining plate II, the cylindrical body 10 of the roller 6, and the through hole 14 of the retaining plate 12, so that the claw member 8 and the roller 6 The disk-shaped body 19b is held movably in a lower-row relationship, respectively.
is locked to the upper edge of the cylindrical body 15.

In this case, the main body portion 16, the tilting piece portion 17, and the locking piece portion 18 are disposed on the same line when viewed from above. In addition, the locking piece 18 is vertically provided substantially parallel to the axis 0 of the foil 2, but it is possible to make the locking piece 18 vertically parallel to or slightly inclined toward the outer diameter direction (direction away from the foil 2) toward the tip. is preferable in that it makes it easier to catch the bead part 7, and being slightly inclined means 5@ with respect to the axis 0 (vertical axis).
Furthermore, it is preferable that the tip edge of the locking piece 18 is rounded like a turn, and the daily length of the locking piece 18 is, for example, about 30 mm. and preferably 40 to 50M.

The roller 6 and the claw member 8 are allowed to swing about the axis O1 of the support 19, as shown in FIGS. 2 and 3. In this case, the roller 6 and the claw member 8 are The swing range of each is about 90'. In other words, as shown in FIG.
．． As it passes through the straight line! The claw member 8 is displaced into a state where its axis coincides with the straight line m, as shown in FIG. 2, and a state where its axis coincides with the straight line m, as shown in the third The center is displaced to a state in which the center coincides with the straight line l. In this case, the roller 6 is in the state shown in the second jump so that the protrusion 30 of the cylindrical body 10 of the holding rod 9 is on the holding plate 11.12vI.
A straight line! Further, the claw member 8 is prevented from swinging in the direction of arrow B in the direction shown in FIG. What is necessary is to restrict the swinging in the direction indicated by the arrow. That is, the stopper member 20 consists of an L-shaped piece 21 and a bolt 22 that is screwed into a threaded hole in the vertical part 21a of the L-shaped piece 21.
The horizontal portion 21b of the L-shaped piece 21 is fixed to the side wall of the cylindrical body 15, but in this case, it is offset by 45 degrees with respect to the claw member 8 in plan view. Therefore, in the state shown in Figure 3,
A side portion of the vertical portion 21a of the L-shaped piece 21 contacts the other inclined surface 11b of the holding plate 11, and in this state, the bolt 22 is tightened to bring the tip end surface of the bolt 22 into contact with the inclined surface itb. That is, by changing the amount of protrusion of the bolt 22 toward the inclined surface 11b, the angle of the claw member 80 can be adjusted, and the claw member 8 can be aligned with the straight line l.

Further, the holding plates 11 and 12 are movable in the vertical direction and in the radial direction (in the direction toward and away from the foil 2) by a rising mechanism (for example, composed of a screw rod and a motor, etc.) not shown. Therefore, the roller 6 and the claw member 8 are movable in the vertical direction and the radial direction. In addition, the axis center is 0. Tip surface 18 of bead locking piece portion 18 of claw member 8
a and the tip surface 6a of the roller 6 from the axis 01
The dimension L2 up to is set to be the same dimension.

Next, a method for mounting the tire 1 on the wheel 2 using the tire changer configured as described above will be explained.

First, as shown in FIG. 1(1), the wheel 2 is placed on the wheel fixing base 3 and fixed with bolts 50, and the tire X is placed on the rim flannon 25 of the wheel 2.

Next, the roller 6 that had escaped to the standby position (in a state that corresponds to the straight line 2 as shown in FIG. 2 in plan view) is advanced and lowered to press it against the upper bead portion 7 of the tire As shown in (II), a part of the lower bead portion 4 facing the pressed portion of the pressed upper bead portion 7 is inserted into the well 24 of the foil hole L:5. In this state, the foil 2 is rotated about the axis 0 in the direction of arrow C, as shown in FIG. (In this case, if the roller 6 is rotated in the direction of the arrow shown in FIG. 3, there is a risk that the roller 6 will swing in the direction of the arrow due to the reaction force from the tire 1.) Therefore, With this rotation, the entire lower bead portion 4 is inserted into the foil well 24 as shown in FIG. 1 (Ill).

Then, the roller 6 is swung 90 degrees in the direction of arrow A shown in FIG. 3 to separate it from the tire l.

Next, adjust the claw member 20, place the claw member 8 two times in plan view, and make a straight line! In this state, the At claw member 8 is lowered to lock the upper bit part 7 to the bead locking piece part 18, as shown in FIG. 1 (8). The locking piece 18 is located at a position radially outward from the rim flange 25 (approximately 10 mail from the rim flange 25).
), and the locking piece 18 of the upper bead 7
The corresponding portion is pulled radially outward as shown by arrow E in FIG. 3, and the upper bead portion 7 has a substantially elliptical shape in plan view.

Note that when locking the locking piece 18 to the upper bead portion 7, the claw member 8 is moved forward once and stopped at a position where the locking piece 18 slightly exceeds the upper bead portion 7 inward in the radial direction. Then, after lowering the claw member 8 to bring the locking piece 18 closer to the upper bead 7, the claw member 8 is moved radially outward to bring the locking piece 18 closer to the upper bead 7. brought into contact, and
It may be moved radially outward from the rim flange 25 to a position slightly distant and then stopped.

Then, the drive motor of the wheel fixing base 3 is driven in reverse to rotate the wheel 2 from the state shown in FIG. 3 about its axis 0 in the direction indicated by the arrow. (In this case, if the claw member 8 is rotated in the direction of the arrow C shown in FIG. In order to prevent the upper bead portion 7 from coming out of the foil well 24 due to restoring force, the rim flange 25 is provided with a pressing member 38 (sixth (see figure) is installed. That is, the rim flange 25 is
The bead portion 7 is always pressed downward by the inclined portion 35 of the presser member 3, and the foil 2 is prevented from spinning.

Therefore, as the foil 2 rotates in the direction of the arrow, the upper bead portion 7 is pulled in the outer diameter direction and inserted into the foil well 24 of the rim 5. And wheel 2 and tire 1
When the upper bead portion 7 is completely inserted into the foil rim 5 after one complete rotation and reaches the state shown in FIG. 1(V), the pawl member 8 is separated from the tire 1. Next, high pressure air is injected from the valve 36, and the assembly work is completed when the upper bead portion 7 and the lower bead portion 4 are respectively fitted into the rim flange 25 as shown in FIG. 1 (Vl).

Therefore, in the above embodiment, the dimension and the dimension L2
Since the settings are the same, there is no need to move the foil 2 when switching between the state in which the lower bead part is assembled by the roller 6 and the state in which the upper bead part is assembled by the claw member 8, resulting in excellent operability. It becomes.

Next, FIG. 5 shows another embodiment of the claw member 8, in which the claw member 8 has a shaft portion 27 that projects from the side wall of the cylindrical body 26.
and a separation section 28 provided with a bead locking piece section 18. The separation part 28 consists of a cylinder part 29 into which the shaft part 27 is inserted and removed, an inclined piece part 4o, and a locking piece part 18. During use, the shaft part 27 is inserted into the cylinder part 29. The cylindrical portion 29 and the shaft portion 27 are made integral with a connecting member such as a bolt (not shown). In other words, when not in use, the separation part 28 can be removed from the shaft part 27 by releasing the connection by the connector. It goes without saying that the claw member 8 and the roller 6 can be prevented from interfering with each other by having different rotational and swinging directions.

Note that the present invention is not limited to the above-described embodiments, and is free to change the design without departing from the gist of the present invention. For example, in the embodiments, the roller 6 and the pawl member 8 swing around the same axis 01. 2 and 1 (II) when the lower bead part is assembled by the roller 6. The state shown in FIG. 3 and FIG.
It may be rotated in either direction of arrows C and D as long as the state shown in Figure (rV) is maintained.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

The lower bead portion 4 of the tire I is securely attached to the rim 5 by the roller 6.
Also, when assembling the upper bead part, the use of the claw member 8 prevents the upper heat part 7 from being bitten and ensures that the upper bead part 7 is firmly attached to the rim 5 without damaging the inner surface of the tire. This can be incorporated.

[Brief explanation of the drawing]

Fig. 1 is a simplified diagram showing how to use an embodiment of the tubeless tire changer according to the present invention, Fig. 2 is an enlarged plan view of the main part when the roller is used, and Fig. 3 is an enlarged view of the main part when the claw member is used. FIG. 4 is an enlarged front view of the claw member, FIG. 5 is an enlarged front view of another embodiment of the claw member, and FIG. 6 is an enlarged front view of the holding member. FIG. 7 is an enlarged perspective view of the main parts of the conventional example. DESCRIPTION OF SYMBOLS 1... Tire, 2... Wheel, 3... Wheel fixing base, 4... Lower bead part, 7... Upper bead part, piece, 0... Axis center. 5...Foil rim, 6...Roller, 8...Claw member, 18...Bead locking patent applicant Sumitomo Rubber Industries, Ltd. (TV)

Claims (1)

[Claims] 1. The foil 2 whose axis 0 is vertically arranged is
In a tubeless tire changer equipped with a wheel fixing base 3 that is rotatably held around the wheel, the upper bead portion 7 of the tire 1 placed on its side on the foil 2 is moved downward while the wheel 2 is rotating. It has a roller 6 that presses the lower bead portion 4 of the tire 1 into the wheel rim 5, and a bead locking piece 18 that is vertically disposed substantially parallel to the axis of the wheel 2. The locking piece portion 18 is in sliding contact with the upper bead portion 7 of the tire 1,
A changer for a tubeless tire, comprising: a claw member 8 that pulls the upper bead portion 7 in the outer radial direction and incorporates it into the wheel rim 5 while the wheel 2 is rotating.