JP5843565B2 - Tire change cradle - Google Patents

Description

  The present invention relates to a tire replacement cradle that facilitates safety of vehicle tire replacement work.

  A conventional tire replacement operation will be described with reference to FIG. 1 showing the embodiment. To replace the tire T, first, the wheel nut 11 screwed to the hub bolt 13 on the wheel W is loosened to some extent, and the vehicle body 19 is moved. The tire T is lifted by pushing up with the jack J, the wheel nut 11 is removed, and then the tire T is held by hand and removed.

  When mounting the tire T, while holding the tire, align the bolt hole 12 with the hub bolt 13, push the tire, temporarily tighten the wheel nut 11, rotate the jack J to lower the vehicle body 19, and adjust the wheel nut 11 appropriately Tighten to the end.

  As described above, exchanging tires is an unstable operation while holding heavy tires directly by hand, and there are problems not only in safety but also in dirt on clothes.

  Conventionally, as a solution to this, a tire replacement assisting tool (for example, see Patent Document 1) provided with an elevating mechanism, a tire replacement assisting table with casters (for example, see Patent Document 2), and the like have been proposed.

JP 2010-64615 A JP 2007-1557 A

  In the auxiliary tool described in Patent Documents 1 and 2, the tire must be lifted by supporting it by hand and placed on a roller or a pipe, and the conventional tire exchanging work is carried out by floating the vehicle body with a jack. Similarly, there were many problems such as fatigue caused by weight, dirt on clothes, safety, etc.

  The present invention is intended to solve the problem of tire replacement work which has been forced to perform such complicated work, and the tire replacement work can be easily and safely performed with little force without soiling clothes. An object of the present invention is to provide a tire replacement cradle that can perform the above.

  In the following, means for solving the problem will be described with reference to the mode for carrying out the invention and the reference numerals used therein. The following description is intended to clarify the correspondence between the description of the claims and the description of the mode for carrying out the invention, including the reference numerals. Needless to say, the technical scope of the claims of the present invention is not limited. It is not intended to be restrictive in interpreting ranges.

In order to solve the above-described problem, the tire replacement cradle 10 according to the present invention includes:
An upward U-shaped support portion 20 provided with a bottom surface 21 and wall portions 22, 22 ′ erected from both ends of the bottom surface 21, and a mounting portion 30 disposed on the bottom surface 21 of the support portion 20, It consists, before Symbol support portion 20 has a cam shaft 25 to the position of one of the wall portion 22 closer,
The mounting portion 30 includes a pair of rollers 36 and 36 ′ that rotatably hold the tire and whose axial direction is parallel to the wall portions 22 and 22 ′. , e Bei the 'upper surface 34 that is rolled continuously in the' 36,
In the embodiment, the upper surface 34 ′ on the other end side of the mounting portion is rotatably connected to the other wall portion 22 ′ side of the support portion 20, and the cam shaft 25 of the support portion is rotated forward and backward. An intermittent rotation stopping mechanism 40 comprising a mechanism that intermittently rotates in the direction and stops at a desired rotational position is provided, and slides on the back surface of the upper surface 34 on one end side of the mounting portion 30 to raise and lower one end side of the mounting portion Cam 26 is provided ,
A thin bulge 28 is formed on the back surface of the bottom surface 21 of the support portion 20 to facilitate the sliding of the support portion 20 with respect to the ground (claim 1).

  In addition, an inclined surface 24 (and / or 24 ') for rolling the tire T is provided on at least one of the wall portions 22 and 22' on both ends of the support portion 20, and the mounting portion 30 includes a tire. T is rolled continuously with at least one of the inclined surfaces 24 and 24 'of the support portion via the rollers 36 and 36' and the upper surfaces 34 and 34 ', respectively. ).

The inventions according to claims 3 to 7 of the present invention comprise a support portion 20 having a predetermined rigidity and a placement portion 30.
The support portion 20 has inclined surfaces 24 and 24 that are inclined from the upper end edges 23 and 23 ′ located at the same height of the wall portion of the support portion 20 outward in the direction perpendicular to the axes of the rollers 36 and 36 ′, respectively. 'Is formed symmetrically, and both shaft end sides of the cam shaft 25 to which the cam 26 is fixed in the vicinity of the one wall portion 22 are supported by bearings 27 and 27'. The shaft end of the cam shaft is connected to a socket of the intermittent rotation stop mechanism 40 (Claim 3).

The mounting portion 30 includes one wall portion 31 erected upward from one end of the bottom surface 33 of the mounting portion 30 at the rotation allowable position of the cam 26, and the wall portion 31 as the support portion. 20 has an upper surface 34 that is bent in the direction of the upper edge 23, 23 'of the wall portion at substantially the same height as the upper edge 23, 23' of the wall portion 22, 22 '. The other end of the bottom surface 33 of the portion 30 rises up the other wall portion 31 ′ that continues to the upper surface 34 ′ having substantially the same width as the upper surface 34 that continues to the one wall portion 31. The edges of the upper surfaces 34, 34 ′ are bent pieces 341, 341 whose lower ends extend to the bottom surface 21 of the support portion 20 or abut against the bottom surface along the wall portions 22, 22 ′ of the support portion 20. (Claim 5).

  In the embodiment, the upper end edge of the other bent piece 341 ′ of the mounting portion 30 is rotatably connected to the other upper end edge 23 ′ of the support portion 20. Two rollers 36 and 36 ′ on which the tire is mounted in proximity to and parallel to the wall portions 31 and 31 ′ are provided on the mounting portion bottom surface 33 of the mounting portion 30 in two pairs of bearings 37 and 37. 'It is bearing each.

  In addition, a handle 201 protruding in the axial direction of the roller can be provided on the bottom surface 21 of the support portion 20 (Claim 6).

Further, the bearing includes a pair of bearing plates 370 and 370 ′ in which a plurality of bearing recesses 371 and 371 ′ are respectively formed. it can be formed by fixing the wall portion 31 or 31 'of (claim 7).

With the above configuration, the tire replacement cradle 10 of the present invention can keep the height from the support portion 20 to the rollers 36 and 36 ′ of the placement portion 30 low, and in particular, the inclined surfaces 24 and 24 ′ are provided. If the, thereby the height of the rollers 36, 36 'of portion 30 mounting the support portion 20, as compared with the case of not providing this further, it becomes possible to suppress, of tires Therefore, the amount of jack-up of the vehicle body and the ascending / descending distance of the mounting portion 30 of the present invention may be small, and as a result, a safe tire replacement operation can be performed at a low position.

  In addition, the loading and unloading of the tire on the tire replacement cradle 10 can be easily performed by rolling the upper surfaces 34 and 34 'via the rollers 36 and 36' of the mounting unit 30, respectively. If there is one or both of the side inclined surfaces 24, 24 ', it can be carried out easily and smoothly.

  Further, by rotating the cam by driving the camshaft having the intermittent rotation stop mechanism 40 without depending on the jack for raising and lowering the vehicle body, the minute raising and lowering positioning with respect to the hub bolt 13 of the jacked-up tire is performed together with the rotation of the roller. It can be done quickly and easily.

  In addition, if the bulging portion 28 is provided on the back surface of the bottom surface 21 of the support portion 20, the overall height of the cradle 10 that contributes to reducing the jack-up amount can be reduced regardless of the casters, and the resistance can be reduced. For example, the heavy tires placed on the rollers 36 and 36 ′ can be lightly moved by the handle 201 provided on the support portion 20.

  Through the above series of operations, the bolt hole 12 can be easily positioned and fitted to the hub bolt 13 which is the most troublesome in the past.

  Therefore, according to the tire replacement cradle of the present invention, the tire replacement operation can be performed easily and safely with a small force without soiling the clothes due to the interlocking action of each function described above.

1 is a perspective view showing an embodiment of a tire replacement cradle according to the present invention, in which a portion of an upper surface 34 in the lower part of the drawing portion of the mounting portion 30 is cut away. It is a perspective view which shows the state of the original position which lowered | hung the mounting part of the tire exchange cradle which concerns on this invention. (A) It is a fragmentary perspective view which shows the state which raised the mounting part of the tire exchange cradle which concerns on this invention. FIG. 5B shows another embodiment of the roller bearing. (A) is a partial longitudinal cross-sectional view of the tire replacement cradle according to the present invention, in which (A) is a state in which the mounting portion is lowered, and (B) is that the mounting portion is raised. Indicates the state. The figure which abbreviate | omitted the intermittent rotation stop mechanism which shows the other structure of the bulging part from the back surface of the support part bottom face of the tire exchange cradle which concerns on this invention, and the figure (A) is the perspective view from the back surface, (B) is a bottom view, and FIG. (C) is a sectional view taken along the line CC in FIG.

  Hereinafter, the details of an embodiment of the present invention will be described with reference to the accompanying drawings.

  1 to 5, the overall configuration of the tire replacement cradle 10 according to the present invention includes a metal support portion 20 having a predetermined rigidity and a placement portion 30.

  The support portion 20 is formed on both end sides of the inclined surfaces 24 and 24 'for rolling the tire T, and is disposed on the support portion, and is in sliding contact with the back surface of the upper surface 34 on one end side of the mounting portion described later. A cam that moves up and down one end side of the mounting portion, for example, a cam shaft 25 including a cam 26 such as a disc cam, and a tire 33 that is rotatably disposed in parallel with both longitudinal ends of the bottom surface 33 of the mounting portion 30 described above. A pair of rollers 36 and 36 ′ and an upper surface 34 and 34 ′ on which the tire T rolls continuously to the inclined surfaces 24 and 24 ′ of the support portion 20 are provided. That is, the tire T rolls, for example, from the inclined surface 24 to the upper surface 34, from the rollers 36 to 36 'to the upper surface 34', and the inclined surface 24 '.

  The inclined surfaces 24 and 24 ′ can be configured to have a very low distance without applying a large force to the movement from the bottom surface 21 of the support portion 20 to the roller on the placement portion 30 in the present invention. The height from the floor or the ground of the work site to the upper surface 34 of the mounting portion 30 is a height at which the tire can be easily mounted by rolling, and the inclined surfaces 24 and 24 ' It is not essential that only one or both are provided.

  In the illustrated embodiment, the support portion 20 as a whole is inclined from the both upper end edges 23, 23 'of the upward U-shaped steel plate in opposite directions to the bottom surface 21 to form both inclined surfaces 24, 24'. Forming.

  That is, the rollers are formed from wall portions 22, 22 ′ formed by vertically raising both ends of a substantially horizontal bottom surface 21 of the support portion 20, and upper end edges 23, 23 ′ located at the same height of the wall portions. Inclined surfaces 24 and 24 ′ that are inclined outward in the direction perpendicular to the axis are symmetrically formed. The cam shaft 25 is supported inside the wall portion 22 that rises perpendicularly from the bottom surface 21 on the one inclined surface 24 side, and both shaft end sides are supported by bearings 27 and 27 '.

  The shaft end of the cam shaft 25 is connected to the intermittent rotation stop mechanism 40. In the embodiment, the mechanism 40 includes a ratchet mechanism that intermittently rotates in the forward and reverse directions and stops at a desired rotational position.

  Although not limited to this, in the embodiment, as shown in FIGS. 1 to 3, a ratchet wrench having a double-ended socket 41, a switching portion of a so-called double-ended ratchet wrench or a switching pin 42 (this application) In the specification, an “intermittent rotation stop mechanism” or “ratchet mechanism” is fixed to the side of the rectangular parallelepiped bracket 43 by welding or the like, and the upper side of the bracket 43 is welded to the back surface of the inclined surface 24 or the like. It is stuck.

  On the cam shaft side 41 ′ of the double-ended socket 41, the tip of the cam shaft 25 is processed into a hexagon or the like and inserted.

  In the present embodiment, the intermittent rotation stopping mechanism 40 is fixed to the bracket 43 provided on the back surface of the inclined surface 24 as described above, but the inclined surface 24 is attached to the wall portion 22 of the support portion 20. 3 is not shown in the figure because the bracket cannot be fixed to the back surface of the inclined surface 24, the ratchet mechanism 40, that is, the switching claw 42 of the double-ended ratchet wrench having the double-ended socket 41, is not shown in FIG. In (A), the position is rotated by 180 ° counterclockwise around the camshaft, and does not interfere with other members in the space below the right side of the drawing, on the bottom surface 21 of the support portion 20, and below the top surface 34 of the mounting portion 30. In addition, the bracket 43 can be fixed and attached thereto. Since the other end of the switching claw etc. 42 in the ratchet mechanism protrudes also on the back side of the figure, the operation is not hindered.

  The mounting portion 30 is mounted between the wall portions 22 and 22 'of the support portion 20 as a whole, and the upper surfaces 34 and 34' are formed on both ends of the bottom surface 33 of the steel plate 33 having an upward U-shape. . The other bottom surface 33 is formed with the other wall portion 31 ′, upper surface 34 ′, and bent piece 341 ′ that form a downward U-shape integrated with the bottom surface. One wall portion 31, an upper surface 34, and a bent piece 341 as necessary.

  That is, from the other end of the bottom surface 33 of the mounting portion 30, a wall portion 31 ′ raised in parallel with the wall portion 22 ′ of the support portion 20 is connected to the upper edge 23 ′ of the wall portion 22 ′ of the support portion 20. At the same height, the other upper surface 34 'is formed by bending toward the upper edge. In the embodiment, the lower end of the bent piece 341 ′ formed by bending the edge of the other upper surface 34 ′ in parallel with the wall portion 22 ′ of the support portion 20 is bent. It extends in the direction of the bottom surface 21 (FIG. 5C). Note that the lower end of the bent piece 341 ′ may be brought into contact with the support portion bottom surface 21.

  On the other hand, from one end of the bottom surface 33 of the mounting portion 30 described above, one wall portion 31 is formed by rising upward at a rotation allowable position of the cam plate 26, and this wall portion 31 is formed as a wall portion of the support portion 20. One upper surface 34 formed by being bent in the direction of the upper end edge 23 of the wall portion at substantially the same height as the upper end edge 23 of 22 is formed. Further, a bent piece 341 is formed by bending the central portion of the longitudinal direction at the edge of the upper surface 34 in the vicinity of one wall portion 22 of the support portion 20 in parallel, and the lower end is the bottom surface 21 of the support portion 20. (FIG. 2). This is because it does not interfere with the mounting portion of the cam plate 26, which will be described later, and the bearing 27 (, 27 ′) of the camshaft 25. The bent piece 341 can be omitted by forming a width that is placed and locked to the upper edge 23 of the one wall portion 22 of the support portion 20.

  The bent piece 341 ′ is connected to the upper end edge 23 ′ of the other wall portion 22 ′ of the support portion 20 by a connecting portion 35 provided at the edge of the upper surface 34 ′, and the bent piece 341 ′ is omitted. You may do it. That is, the end edge of the upper surface 34 ′ of the mounting portion 30 or the upper end edge of the bent piece 341 ′ is connected to the upper end edge 23 ′ of the wall portion 22 ′ via a connecting portion 35 made of a hinge or the like. As a result, the mounting portion 30 is pivotally connected to the support portion 20.

  Further, on the bottom surface 33 of the mounting portion 30, the two rollers 36 and 36 'on which the tire is mounted are mounted on bearings 37 and 37' fixed to the wall portion in parallel to the wall portions 31 and 31 '. It is bearing.

  As shown in FIG. 3 (B), the bearings include bearing plates 370 and 370 ′ each having a plurality of bearing recesses 371 and 371 ′ formed at predetermined intervals. Each of the edges is fixed to each of a pair of one or one wall portion 31 or 31 ′ in the same manner as the bearing 37 (and / or 37 ′), and the rollers 36, Either or both of 36 'can be supported. Accordingly, the distance between the rollers 36 and 36 'can be adjusted when exchanging tires having different tire sizes.

  The cam plate 26 is an eccentric bearing of a disc cam having an oval shape or the like, and the shaft end portion of the cam shaft 25 is rotated forward by rotation in one direction of the intermittent rotation stop mechanism 40. The convex portion of the cam plate 26 presses against the back surface of one upper surface 34 of the mounting portion 30, and the one upper surface 34 is moved up and down with the mounting portion 30 as a fulcrum of the connecting portion 35 of the other upper surface 34 ′.

  First, in removing the tire T, first, all the wheel nuts 11 are loosened to some extent.

  Next, the vehicle body 19 is jacked up to a height at which the tire replacement cradle 10 of the present invention in the original position (FIGS. 2 and 4A) in which the mounting portion 30 is lowered can be inserted under the tire T. The tire replacement cradle 10 of the present invention is jacked up along the arrow A (FIG. 1) under the tire T, and the handle 201 is gripped by hand so that the back surface of the bottom surface 21 of the support portion 20 is against the ground. And slide to move.

  At this time, the bulging portion 28 on the back surface of the bottom surface 21 of the support portion 20, for example, thin, for example, about 5 mm or less, upside down, bowl-shaped, It is formed in a bottomed box shape as a whole with substantially the same height (FIG. 4), or in a bulging shape that is a part of an arc, or in the vicinity of an even angle portion on the back surface of the bottom surface of the support portion 20. By forming the disk-shaped bulged portion 28 at the place (FIG. 5), the support portion 20 can be smoothly slid, and the tire can be easily taken out, moved downward, and arranged.

  3 (A) and 4 (B) which are a partial perspective view and a partial vertical sectional view showing a state in which the mounting portion 30 of the tire replacement cradle 10 according to the present invention is raised, This shows that the operation is performed by two cam plates 26 and 26.

  A wrench H such as a hexagon wrench is inserted into the socket 41 of the intermittent rotation stop mechanism 40 at the tip of the camshaft 25 and rotated, and the mounting portion 30 moves upward on one upper surface 34 side of the mounting portion 30. Then, the tire T is supported on the rollers 36, 36 ', and all the wheel nuts 11 are loosened and removed. Then, while holding the tire T with one hand and gripping the handle 201 with the other hand and pulling out the tire T on the rollers 36 and 36 ′ along the arrow B, the other upper surface 34 of the mounting portion 30. 'Is rolled and lowered on the other inclined surface 24' of the support portion 20 while rolling.

  FIG.2 and FIG.4 (A) is the perspective view and partial longitudinal cross-sectional view which show the state which lowered | hung the mounting part 30 of the tire exchange cradle 10 which concerns on this invention.

  In the replacement tire mounting operation, the rotation direction is switched by the switching claw 42 of the intermittent rotation stopping mechanism 40, the wrench is rotated, and the one upper surface 34 of the mounting portion 30 is lowered. The handle 201 is gripped and moved to the vicinity of the lower side of the wheel nut of the vehicle body 19 jacked up. Then, the tire T is placed on the rollers 36, 36 ′ via the inclined surface 24 of the support portion 20 of the tire replacement cradle 10 or directly through the one upper surface 34 of the mounting portion 30, and the tire T is placed in one hand. The wheel nut is moved downward by the handle 201 with the other hand while being supported.

  Next, the rotation direction of the intermittent rotation stop mechanism 40 is switched, and the tire T placed on the rollers 36, 36 'of the tire replacement cradle 10 of the present invention is raised by rotating the wrench H, and the bolt hole 12 is moved to the hub bolt 13 To match. Then, the tire replacement cradle 10 of the present invention is pushed along the arrow A, and the bolt holes 12 are fitted to the hub bolts 13.

  Next, all the wheel nuts 11 are temporarily tightened sequentially to switch the rotation direction of the intermittent rotation stop mechanism 40, and the tire T on the rollers 36, 36 ′ is rotated by rotating the wrench H to lower the placement portion 30. Then, the tire replacement cradle 10 is pulled out along the arrow B by the handle 201.

  And the jack J causes the tire 19 to follow the vehicle body 19 and tightens all the wheel nuts 11 appropriately.

  Although illustration is omitted, one end of the shaft of the roller 36 and / or 36 ′ mounted on the mounting portion 30 is formed in a hexagonal shape, and this portion is used as a socket wrench insertion portion, and the roller is used during tire replacement work. The wrench H can be used when a situation where it is desired to control the rotation of 36, 36 'occurs.

DESCRIPTION OF SYMBOLS 10 Tire exchange stand 11 Wheel nut 12 Bolt hole 13 Hub bolt 19 Car body 20 Support part 201 Handle 21 Bottom surface 22, 22 'Wall part 23, 23' Upper edge 24, 24 'Inclined surface 25 Cam shaft
26,26 Cam (plate)
27, 27 'bearing (for camshaft 25)
28 bulging part 30 mounting part
33 Bottom surface (of mounting part 30)
31 and 31 'wall part (of mounting part 30)
34, 34 'upper surface (of mounting part 30)
341, 341 'bent piece 35 connecting part
36, 36 'roller 37, 37' bearing (of roller 36, 36 ')
370, 370 ′ bearing plate 371, 371 ′ bearing recess 40 intermittent rotation stop mechanism
41 Socket 41 'Camshaft side 42 of socket 42 Switching claw (pin)
43 Bracket W Wheel H Wrench T Tire J Jack

Claims (7)

An upward U-shaped support portion provided with a bottom surface and wall portions erected from both ends of the bottom surface, and a mounting portion disposed on the bottom surface of the support portion between the wall portions,
The support portion has a cam shaft at a position near one of the wall portions,
The mounting portion includes a pair of rollers that rotatably hold the tire and whose axial direction is parallel to the wall portion, and an upper surface on which the tire rolls continuously through the rollers. ,
The other end side of the mounting portion is rotatably connected to the other wall portion side of the support portion, and is in sliding contact with the back surface of the upper surface on the one end side of the mounting portion. A cam for raising and lowering the one end side of the mounting portion;
A tire replacement cradle characterized in that a thin bulging portion is formed on the back surface of the bottom surface of the support portion to facilitate sliding of the support portion with respect to the ground.   An inclined surface for rolling the tire is formed on at least one of the both ends of the support portion, and the tire can roll continuously with the pair of rollers and the inclined surface through the upper surface of the mounting portion. The tire replacement cradle according to claim 1, wherein the tire replacement cradle is provided. The support part has inclined surfaces formed symmetrically from the upper end edge located at the same height of the wall part of the support part to the outer side in the direction perpendicular to the axis of the roller, and is close to the one wall part Bearing the cam shaft with the cam fixed thereto, connecting the shaft end of the cam shaft to the intermittent rotation stop mechanism,
The mounting portion has one wall portion standing from one end of the bottom surface of the mounting portion, and an upper surface having a shape obtained by bending the wall portion toward the upper edge of the wall portion of the support portion. The other end of the bottom surface has a wall portion that is continuous with an upper surface that is substantially flush with the upper surface that is continuous with the one wall portion, and a tire is placed adjacent to the wall portion. Bearing the roller,
The tire replacement cradle according to claim 2, wherein an upper surface of the mounting portion is rotatably connected to the support portion. The mounting portion has one wall portion that is erected upward from one end of the bottom surface of the mounting portion at the cam rotation allowable position, and the wall portion is substantially the same as the upper edge of the wall portion of the support portion. The top surface of the wall portion is bent at a substantially right angle in the direction of the upper edge of the wall portion, and the other end of the bottom surface of the mounting portion is positioned substantially flush with the top surface continuous with the one wall portion. Standing up a continuous wall on the top, and bearing two rollers on the bearing near the wall, on which the tire is placed in parallel,
The tire replacement cradle according to any one of claims 1 to 3, wherein an edge of an upper surface of the mounting portion is rotatably connected to an upper end edge of the support portion.   The edge of the upper surface of the mounting part includes a bent piece whose lower end extends to or contacts the bottom surface of the support part along the wall part of the support part, respectively. The tire replacement cradle according to any one of claims 1 to 4.   The tire replacement cradle according to any one of claims 1 to 5, wherein a handle protruding in an axial direction of the roller is provided on a bottom surface of the support portion.   The bearing of the mounting portion described above is characterized in that a pair of bearing plates each having a plurality of bearing recesses are fixed to either one or both of the wall portion and the bottom edge in the width direction at an arbitrary width. The tire replacement cradle according to claim 4.

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