JP4551497B2 - Tire removal aid - Google Patents

Description

  The present invention relates to a tire attachment / detachment aid that assists in tire replacement work of an automobile or the like.

When changing the tire of a car, remove the bolt with both hands after removing the bolt, lift the tire from this middle waist position, and also when attaching the tire, the wheel hole in the axle stud at the middle waist It is necessary to work to match.
Therefore, there are many cases where the tiredness is injured by the tire replacement work.
In the snowy country, it is necessary to replace the tire for winter and the normal tire regularly every year, and it is also necessary to perform this tire demounting work due to occurrence of puncture or the like.
As a tire replacement aid, Japanese Utility Model Laid-Open No. 7-33706 discloses that the main body divided into left and right is connected with a bolt rod and a nut, and the bolt rod is manually rotated and rotated with a knob to change the interval between the left and right main bodies. Disclosed is a technique for raising a tire placed so as to straddle a roller of a main body by narrowing a roller interval.
However, in this structure, in order to adjust the height of the tire to be installed, the bolts are rotated to widen the gap between the rollers. Therefore, the amount of vertical movement of the tire per one rotation of the bolt is very small, and the work is not performed. There was a risk of troublesomeness.

Japanese Utility Model Publication No. 7-33706

  In view of the above technical problem, an object of the present invention is to provide a tire attachment / detachment aid that can quickly adjust the vertical position of a tire.

The technical gist of the present invention is that two tire support roller members for rotatably holding a tire on a tire support base are arranged substantially in parallel, and the tire support base is one of the tire support roller members. A pair of casters (17) provided on both ends and a pair of cam driven casters (16) provided on both ends of the other tire support roller member;
The cam follower caster is attached to the other end of the cam follower plate, one end of which is pivotally supported on the tire support base, and the cam follower plate rotates an eccentric cam whose outer peripheral surface is in contact with the upper surface of the cam follower plate. The cam driven caster side moves up and down by the movement .

A pair of substantially parallel tire support roller members is a predetermined distance between the rotatable rollers according to the size of the tire to be replaced in order to support the tread surface of the tire in such a manner as to be sandwiched from both sides. It is the meaning which arrange | positions in parallel substantially across.
The eccentric cam, includes a cam semi-cylindrical such that eccentric to the axis provided on the tire support base, for example, a handle for rotating the eccentric cam, the cam rotational movement of the handle The purpose is to convert it into a vertical motion by the mechanism.
Such structure example, there is a method for vertical movement by a driven cam follower caster eccentricity journalled to the tire support base.
Thus, for example, when a cam driven caster is combined with a tire support base, the height of the tire support base from the floor surface or the ground is raised and lowered by turning the handle to move the cam driven caster position up and down. The rotation position of the tire can be adjusted using the rotation of the support roller member.

In the tire replacement aid according to the present invention, the lifting / lowering of the tire is performed by turning the handle and driving the cam mechanism, so that it can be performed easily, quickly and accurately.
Since the structure by the cam mechanism is simple, the cost can be reduced.

FIG. 1 shows an embodiment of a tire attaching / detaching aid according to the present invention.
FIG. 1 (a) shows a top view, FIG. 1 (b) shows a front view, and FIG. 1 (c) shows a right side view.
The tire support base 11 of the tire attachment / detachment assisting tool 10 is provided with tire support roller members 12a and 12b facing each other substantially in parallel.
The tire support roller members 12a and 12b receive the two tread surfaces of the tire on both sides so that the outer peripheral shapes of the tire 3a of the medium-sized vehicle and the tire 3b of the small vehicle are shown by imaginary lines in FIG. To support.
A shaft 14b that rotates by rotating a handle 13 parallel to the tire support roller members 12a and 12b is attached to the tire support base 11, and an eccentric cam 14 is attached to the shaft 14b.
A ratchet mechanism 14c is provided on the shaft 14b of the eccentric cam 14 so as to be interposed between the tire support base 11 and the shaft 14b.
For example, the ratchet mechanism portion 14c attaches a pawl wheel (not shown) to the shaft 14b, attaches a lever 14d having a pawl (not shown) to the tire support base 11, and hooks the pawl wheel to catch the shaft 14b. A structure that obtains a detent action against rotation is conceivable.
At that time, the detent release and the selection of the detent direction are performed by operating the lever 14d.
The structure of the ratchet mechanism 14c is not particularly limited as long as the eccentric cam 14 can be detented (latched) and detented (latched released).
The tire attachment / detachment aid 10 is provided with a caster 17 and a cam driven caster 16 that is driven by a cam.
The operation of the cam follower caster 16 accompanying the rotation of the handle 13 will be described with reference to FIG.
2 (a), FIG. 2 (b), and FIG. 2 (c) show the main part drawing around the handle 13, and FIG. 2 (d), FIG. 2 (e), and FIG. FIG. 3 is a main part drawing in which the cover portion is appropriately omitted and the vicinity of the cam 14 is drawn corresponding to FIGS. 2 (A), 2 (B), and 2 (C).
2 (a) and 2 (d) correspond to the state of the tire attachment / detachment aid 10 shown in FIG.
The cam contact surface 14a of the cam 14 contacts the cam follower plate 15, and one end of the cam follower plate 15 is pivotally supported on the tire support base 11 by the cam follower plate shaft 15a.
As shown in FIGS. 2 (a) and 2 (d), when the tire support base 11 is parallel to the floor (ground) 4, the handle 13 is rotated, the shaft 14b is rotated, and the cam 14 is moved. The cam contact surface 14a presses the cam follower plate 15 downward.
The cam follower plate 15 pushes the cam follower caster 16 downward while using the cam follower plate shaft 15a as a shaft fulcrum, so that the tire support base 11 starts from the floor surface 4 as shown in FIGS. 2 (b) and 2 (e). And the tire supporting roller member 12b can be lifted and the tire 3a can be lifted.
By further rotating the handle 13, the tire support base 11 and the tire support roller portion 12b are lifted up to the heights shown in FIGS. 2 (c) and 2 (f), and the tire 3a can be raised further.
In FIG. 1, of the casters 16 and 17 provided on the tire support base 11, the caster on the cam 14 side is a cam driven caster 16 that moves up and down following the cam, and the handle 13 is rotated to rotate the cam driven caster 16 and the tire. By changing the distance from the support base 11, the height of the tire support roller portions 12a and 12b can be changed, and the vertical position of the placed tire can be adjusted.

A method for raising and lowering a tire using the tire attachment / detachment aid will be described with reference to FIGS. 3 and 4.
FIG. 3 is a main part view in which the handle, cover and the like on the front side of the tire attachment / detachment aid are omitted for the sake of clarity.
When the tire is taken down, the vehicle body is lifted with a jack (not shown) or the like, and the tire 5 is removed from the tire with the nut removed, as shown in FIGS. 4 (a) and 3 (a). The roller members 12a and 12b are inserted so as to be positioned below the tire tread surface 3e.
As shown in FIGS. 4B and 3B, the handle 13 is held by one hand 5b, the upper part of the tire 3c is supported by the other hand 5a, the handle 13 is turned, and the cam 14 is rotated. The tire support roller members 12a and 12b are lifted, and the tire 3c is lifted.
At this time, if the position of the cam 14 is fixed by the ratchet mechanism, two-hand operation can be performed.
After lifting the tire 3c in this way, the tire 3c is pulled out in the direction of arrow A in order to remove the wheel hole of the tire 3c from the stud 2a of the axle 2.
After being pulled out, the latch of the ratchet mechanism is released, the handle 13 is returned, the tire support roller portions 12a and 12b are lowered, and the tire 3c is lowered as shown in FIGS. 4 (c) and 3 (c).
Then, the tire 3c is rolled out from the tire attachment / detachment aid 10 using the slope 18 in the direction of arrow C in FIG.
As described above, since the tire is removed using the cam mechanism, the removal work can be performed quickly and easily.

On the other hand, the attachment of the tire 3c is generally reversed.
First, the tire 3d is rolled in the direction of arrow D in FIG. 3 (d), and the tire 3d is placed on the tire support roller members 12a and 12b of the tire attachment / detachment assisting tool 10 using the slope 18, and FIG. 3 (c) and FIG. The state shown in (c) is assumed.
The tire 3d is rotated in the outer circumferential direction by using the rotation of the tire support roller members 12a and 12b, and the position of the wheel hole 3f of the tire 3d and the position of the stud 2a of the axle 2 are matched.
Then, as shown in FIG. 4B, the upper portion of the tire 3d is supported by one hand 5a, and the handle 13 is turned by the other hand 5b to raise the tire 3d.
At this time, as shown in FIG. 3 (b), the cam follower caster 16 is pushed downward with respect to the tire support roller members 12a and 12b. As a result, the tire support roller members 12a and 12b are relatively lifted and the tire 3d. Lift up.
With the tire 3d raised, the tire attachment / detachment aid 10 is pushed in the direction of arrow B, and the stud 2a is fitted into the hole 3f of the wheel.
At this time, if the height of the tire 3d is fixed by the ratchet mechanism, fine adjustment of the position of the wheel hole 3f can be performed with both hands.
Then, the latch 13 is released, the handle 13 is returned, and the tire support base 11 is lowered as shown in FIGS. 3 (a) and 4 (a), and then the tire wheel is fastened with a nut.
In this way, the roller member is rotated to align the position of the wheel hole, and the handle is turned to lift the tire by the cam mechanism, so that the work can be performed accurately, quickly and easily.

The Example of the tire removal | desorption assistance tool which concerns on this invention is shown. An explanatory view of operation of a cam follower caster is shown. Explanatory drawing of the taking in / out state of the tire from the tire removal | desorption assistance tool is shown. Explanatory drawing of the state which an operator uses a tire removal | desorption assistance tool is shown.

Explanation of symbols

1 Car 2 Axle 2a Stud 3a, 3b, 3c, 3d Tire 3e Tire tread surface 3f Tire wheel hole 4 Floor (ground)
5 Worker 5a, 5b Hand 10 Tire attachment / detachment aid 11 Tire support base 11a Tire support base cover 11b Tire support base cover opening 12a, 12b Tire support roller member 13 Rotating handle 14 Eccentric cam 14a Eccentric Cam contact surface 14b Eccentric cam shaft 14c Ratchet mechanism portion 14d Ratchet mechanism portion lever 15 Cam driven plate 15a Cam driven plate shaft 16 Cam driven caster 17 Caster 18 Slope 19 Hand portion

Claims (1)

Two tire support roller members for rotatably holding a tire on a tire support base are disposed substantially in parallel, and the tire support base is a pair of casters provided on both ends of one tire support roller member. (17) and a pair of cam driven casters (16) provided on both ends of the other tire support roller member,
The cam follower caster is attached to the other end of the cam follower plate having one end pivotally supported on the tire support base,
The cam follower plate has a cam follower caster side that moves up and down by the rotation of an eccentric cam whose outer peripheral surface is in contact with the upper surface of the cam follower plate .

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