Guide rod and chain saw

Abstract

The invention provides a technology capable of making the joint part of plate-shaped components forming a guide rod not easy to damage. According to one embodiment of the present invention, a guide bar is provided. The guide rod is provided with three plate-shaped components including a first metal plate, a second metal plate and a resin plate. The first surface of the resin plate is in contact with the first inner surface of the first metal plate. The second surface of the resin plate is in contact with the second inner surface of the second metal plate. A plurality of portions in a region where the three plate-like members overlap each other are provided with joining portions that join the three plate-like members into a whole. A groove through which the saw chain passes is formed by the side surface of the resin plate, the first inner side surface, and the second inner side surface.

Description

Technical Field

[0001] The invention relates to a guide rod and a chain saw. Background Art

[0002] Patent Document 1 discloses a guide rod in which a synthetic resin is filled between side plates as a middle plate, and the side plates and the middle plate are joined by the synthetic resin. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2020-104292 Summary of the invention Technical problem to be solved by the invention

[0004] In the guide rod of Patent Document 1, since the side plates and the middle plate are joined over the entire surfaces that are in contact with each other, when the guide rod is twisted or deformed, damage such as peeling of the joined surfaces is likely to occur.

[0005] In view of the above circumstances, the present invention provides a technique for making it difficult for damage to occur at a joint between plate-like members constituting a guide rod. Technical means of solving problems

[0006] According to one embodiment of the present invention, a guide rod is provided. The guide rod includes three plate-like components, namely, a first metal plate, a second metal plate, and a resin plate. The first surface of the resin plate contacts the first inner surface of the first metal plate. The second surface of the resin plate contacts the second inner surface of the second metal plate. A plurality of joints are provided in the region where the three plate-like components overlap to form a whole. A groove for a saw chain to pass through is formed by the side surface, the first inner surface, and the second inner surface of the resin plate.

[0007] According to the present invention, it is possible to make the joints between the plate-like members constituting the guide rod less susceptible to damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 1 is a block diagram showing the overall structure of the chain saw 1 . Figure 2 1 is a diagram showing the appearance of the guide rod 10 as viewed from the left side. Figure 3 1 is a diagram showing the appearance of the guide rod 10 as viewed from the right side. Figure 4 FIG. 1 is a diagram showing the plate-like member 100 before joining. Figure 5 It is a figure which shows the plate-shaped member 100 after close contact. Figure 6 FIG. 1 is a diagram showing the plate-like member 100 after being connected. Figure 7 It is a figure which shows an example of the rivet of a different shape. Figure 8 It is a figure which shows an example of the resin plate of a different shape. DETAILED DESCRIPTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the embodiments described below, various features described can be combined with each other.

[0010] <Implementation Method> Figure 1 is a block diagram showing the overall structure of the chain saw 1. Figure 1 , the chain saw 1 is shown as viewed from the left side. The chain saw 1 includes a main body 2, a working unit 3, a driving unit 5, and a battery 6. The main body 2 is a part that serves as the main body of the chain saw 1, and the driving unit 5 is accommodated and held therein. In addition, the main body 2 holds the working unit 3 so that it is exposed to the outside, and holds the battery 6 in a detachable manner. The main body 2 has a front handle 21, a rear handle 22, and an operating lever 23.

[0011] The front handle 21 and the rear handle 22 are handles that the operator holds when using the chain saw 1 to perform work. The operating lever 23 is an operating device that the operator operates when using the chain saw 1 to perform work. When the operator uses the chain saw 1 to perform work, the working part 3 contacts the work object and directly acts on the work object. In this embodiment, the work object is a tree or a board, etc., and the working part 3 acts to cut them. The working part 3 includes a saw chain 4 and a guide rod 10.

[0012] The guide bar 10 is a plate-shaped member extending in the front-rear direction, and the rear end portion of the guide bar 10 is mounted to the main body 2. A groove is formed on the outer periphery of the guide bar 10, and the endless saw chain 4 is wound along the groove. The saw chain 4 has a plurality of top blades and a plurality of drive links, each of which is formed of metal and connected to each other to constitute the saw chain 4. When the plurality of drive links pass through the groove of the guide bar 10, the saw chain 4 rotates around the outer periphery of the guide bar 10.

[0013] The driving unit 5 includes a motor and a driving gear, etc., and is operated by the power supplied from the battery 6, and drives the saw chain 4 to rotate. The driving unit may also include an internal combustion engine instead of the motor. By driving the saw chain 4 to rotate, the plurality of top blades cut and sever the work object. As described above, the chain saw 1 includes a guide bar 10, a saw chain 4 passing through a groove of the guide bar 10, and a driving unit 5 that drives the saw chain 4.

[0014] Figure 2 1 is a diagram showing the appearance of the guide rod 10 as viewed from the left side. Figure 31 is a diagram showing the appearance of the guide rod 10 viewed from the right side. The guide rod 10 includes three plate-shaped members 100: a first metal plate 11, a second metal plate 12, and a resin plate 13. The first metal plate 11 and the second metal plate 12 are formed of metal such as iron or an alloy, but other metals may be used as materials as long as they have the strength required for the guide rod 10. The resin plate 13 is formed of a synthetic resin. The synthetic resin used for the resin plate 13 is preferably a resin with excellent heat resistance and oil resistance.

[0015] The first metal plate 11 includes first joint portions 111-01, 111-02, 111-35 (hereinafter, collectively referred to as "first joint portion 111" without distinguishing each other), and first cored portions 112-1, 112-2, 112-3 (hereinafter, collectively referred to as "first cored portion 112" without distinguishing each other). The first joint portion 111 is a portion that is joined to integrate the three plate-like components 100. In the present embodiment, the first joint portion 111 is formed with a hole for inserting a rivet, and the three plate-like components 100 are joined by inserting the rivet into the hole.

[0016] In addition, in the first metal plate 11, 35 first joining parts 111 are evenly arranged from the nose to the mount. The first joining parts 111-01 to the first joining parts 111-17 of the first joining parts 111 are arranged on the upper side, and the first joining parts 111-19 to the first joining parts 111-35 are arranged on the lower side, and the first joining part 111-18 is sandwiched therebetween. The first cored parts 112 are portions removed from the first metal plate 11 to reduce weight. The resin plate 13 joined to the first metal plate 11 can be seen from each first cored part 112.

[0017] The second metal plate 12 has second joining portions 121-01, 121-02, 121-35 (hereinafter, collectively referred to as "second joining portions 121" when not distinguishing from each other) and second cored portions 122-1, 122-2, 122-3 (hereinafter, collectively referred to as "second cored portions 122" when not distinguishing from each other). The second joining portion 121 is a portion that is joined to integrate the three plate-like components 100. In the present embodiment, the second joining portion 121 is formed with a hole for inserting a rivet, and the three plate-like components 100 are joined by inserting the rivet into the hole.

[0018] In addition, in the second metal plate 12, 35 second joining parts 121 are evenly arranged from the nose to the mount. The second joining parts 121-01 to the second joining parts 121-17 are arranged on the upper side, and the second joining parts 121-19 to the second joining parts 121-35 are arranged on the lower side, and the second joining part 121-18 is sandwiched therebetween. The second cored parts 122 are portions removed from the second metal plate 12 to reduce weight. The resin plate 13 joined to the second metal plate 12 can be seen from each second cored part 122.

[0019] The guide rod 10 is formed by overlapping and joining a first metal plate 11, a second metal plate 12, and a resin plate 13. Figures 4 to 6 , the order of joining these three plate-like components 100 will be described. Figure 4 FIG. 1 is a diagram showing the plate-like member 100 before joining. Figure 5 It is a figure which shows the plate-shaped member 100 after close contact. Figure 6 1 is a diagram showing the plate-like member 100 after being connected. Figure 6 Shown along Figure 2 The three plate-like components 100 are viewed in the direction of arrows along line AA.

[0020] First, refer to Figure 4 The first metal plate 11 has a first joint portion 111, a first cored portion 112, a first inner side surface 113, and a first outer surface 114. The second metal plate 12 has a second joint portion 121, a second cored portion 122, a second inner side surface 123, and a second outer surface 124. The resin plate 13 has a joint portion 131, a first surface 132, a second surface 133, a central portion 134, a first filling portion 135, and a second filling portion 136.

[0021] The first inner side surface 113 is the surface facing the resin plate 13 side (i.e., the inner side) of the two planes (non-side surfaces) of the first metal plate 11. The first outer surface 114 is the surface facing the opposite side (i.e., the outer side) to the first inner side surface 113. Here, when viewed from the first metal plate 11 and the second metal plate 12, the side of the space (space for the resin plate 13 to be arranged) sandwiched between the first metal plate 11 and the second metal plate 12 is the inner side, and the side opposite to the space is the outer side.

[0022] The second inner side surface 123 is a surface facing the resin plate 13 side (i.e., the inner side) of the two planes (non-side surfaces) of the second metal plate 12. The second outer surface 124 is a surface facing the opposite side (i.e., the outer side) to the second inner side surface 123. The first surface 132 is a surface facing the first metal plate 11 side of the surfaces of the resin plate 13. The second surface 133 is a surface facing the second metal plate 12 side of the surfaces of the resin plate 13.

[0023] The first joint portion 111, the joint portion 131, and the second joint portion 121 are formed with holes for inserting rivets, and their positions are set so that when the three plate-like members 100 are overlapped, the holes are aligned with each other and connected. The first cored portion 112 forms a space B1 in the center of the first metal plate 11 for weight reduction. The second cored portion 122 forms a space B2 in the center of the second metal plate 12 for weight reduction.

[0024] The first filling portion 135 is formed at a position and shape to fill the space B1 when the first metal plate 11 and the resin plate 13 are joined. The second filling portion 136 is formed at a position and shape to fill the space B2 when the second metal plate 12 and the resin plate 13 are joined. The central portion 134 is a plate-shaped portion of the resin plate 13 excluding the first filling portion 135 and the second filling portion 136.

[0025] Next, refer to Figure 5 For explanation. Figure 5 As shown, in the guide bar 10, the first surface 132 of the resin plate 13 is in contact with the first inner side surface 113 of the first metal plate 11, and the second surface 133 of the resin plate 13 is in contact with the second inner side surface 123 of the second metal plate 12. In addition, in the guide bar 10, the first filling portion 135 of the resin plate 13 is embedded in the space B1 formed by the first cored portion 112 of the first metal plate 11, and the second filling portion 136 of the resin plate 13 is embedded in the space B2 formed by the second cored portion 122 of the second metal plate 12.

[0026] exist Figure 5 In the illustrated state, the first engaging portion 111, the engaging portion 131, and the second engaging portion 121 form a commonly connected hole C1. By inserting a rivet into the hole C1 and performing a riveting process, the three plate-like members 100 are connected.

[0027] Next, refer to Figure 6 The rivet 16 is installed in the hole C1. The rivet 16 is a rivet having rounded heads at both ends by performing riveting processing (processing to deform the ends of the rivet) on both ends of the shaft portion having a cylindrical or cylindrical shape. As described above, in the guide rod 10, a plurality of joint portions for joining the three plate-like members 100 as one are provided at the overlapping region (hereinafter referred to as the "overlapping region") of the three plate-like members 100.

[0028] For example, the overlapping region is a region where the three plate-like members 100 overlap when the guide bar 10 is viewed from the normal direction F1 of the first surface 132 of the resin plate 13. In other words, the overlapping region is a region where the first inner side surface 113 of the first metal plate 11 and the first surface 132 of the resin plate 13 are in contact, and is also a region where the second inner side surface 123 of the second metal plate 12 and the second surface 133 of the resin plate 13 are in contact.

[0029] Furthermore, in this embodiment, the plurality of joints are Figure 2 The guide rod 10 is provided with a plurality of first joints 111 and a plurality of second joints 121 as shown. By using the resin plate 13, the weight is reduced compared with the case where all metal plates are used. However, in the case of heterogeneous joints in which metal plates and resin plates are mixed, for example, during spot welding, the resin will dissolve and thus cannot be joined. In this embodiment, the above-mentioned joints are joined with rivets, so even in heterogeneous joints containing metal and resin, the joint can be performed without causing inconveniences such as dissolution of the resin.

[0030] In addition, in the present embodiment, the center of the first metal plate 11 and the second metal plate 12 are removed, and the resin plate 13 has a shape that fills the space B1 where the first metal plate 11 is removed and the space B2 where the second metal plate 12 is removed. If the removed space is left empty, sawdust (wooden chips) may accumulate in the space during operation, thereby reducing workability, but by filling the space with the resin plate 13, the accumulation of such sawdust can be prevented.

[0031] In addition, as described above, in the guide bar 10 formed by joining three plate-like members 100, the groove E1 through which the saw chain 4 passes is formed by the side surface 137 of the resin plate 13, the first inner side surface 113 of the first metal plate 11, and the second inner side surface 123 of the second metal plate 12. That is, the bottom surface of the groove E1 is formed of resin. In contrast, in the guide bar in which three metal plates are joined by rivets that have been proposed so far, the bottom surface of the groove through which the saw chain passes is also formed of metal.

[0032] As described above, the saw chain 4 passing through the groove E1 is formed of metal. Therefore, when the bottom surface of the groove is metal, when the saw chain 4 contacts the bottom surface of the groove, it may cause damage to the saw chain 4, so it is necessary to leave a certain distance (for example, about 2mm to 3mm) between the bottom surface of the groove and the saw chain 4. Here, lubricating oil is supplied to the groove through which the saw chain 4 passes, so as to make the rotation of the saw chain 4 smoother, but the larger the distance between the bottom surface of the groove and the saw chain 4, the more difficult it is to transport the lubricating oil in the rotation direction, and the worse the effect of the lubricating oil.

[0033] On the other hand, in the guide bar 10 of the present embodiment, even if the saw chain 4 contacts the side surface 137 formed as the bottom surface of the groove E1, it is the side surface 137 which is the resin that is scraped off. Therefore, compared with the case where the bottom surface of the groove is metal, even if the side surface 137 approaches the saw chain 4 to the limit position, there is no worry that the saw chain 4 will be damaged. As a result, the lubricating oil can be easily conveyed in the rotation direction, and the effect of the lubricating oil is improved.

[0034] In addition, it is assumed that the joint of the three plate-like parts 100 is the entire area where the three plate-like parts 100 overlap. In this case, for example, when the guide rod 10 is bent or twisted due to the force from the work object, the surface facing the outer side of the bend is longer than the surface facing the inner side of the bend. In this state, since the two surfaces of the two plate-like parts (the first metal plate 11 and the resin plate 13 and the resin plate 13 and the second metal plate 12) that contact each other have different degrees of expansion and contraction, the forces applied to the two surfaces are offset from each other, but since it is an integral joint, there is a possibility that peeling occurs at the joint.

[0035] In contrast, in the guide rod 10, the entire overlapping area is not joined, but the first joining portion 111 and the second joining portion 121 in the overlapping area are joined, and no joining is performed at other locations. Therefore, in the case where the guide rod 10 is bent, the resin plate 13 at the location where no joining is performed can be offset or stretched. Thus, according to this embodiment, compared with the case where the entire area (i.e., the overlapping area) where the three plate-like components 100 are in contact with each other is joined, the joining locations of the plate-like components constituting the guide rod can be made less susceptible to damage.

[0036] <Other Implementation Methods> The shape of the rivet is not limited to the shape described in the embodiment. Figure 7 1 is a diagram showing an example of rivets of different shapes. Figure 7 The figure shows that Figure 6 The rivets 16 shown in the figure are of different shapes and are used to join the guide rods 10a. Figure 7 2 and 3 respectively show the rivet 16 a before and after the riveting process.

[0037] The rivet 16a has a flange 161a at the center in the axial direction F2. The flange 161a is a protruding portion protruding outward from a cylindrical or cylindrical portion of the rivet 16a, and has the same thickness G1 as the resin plate 13 in the overlapped region. Figure 7 In the example of FIG. 1 , a hole C1a connected in common is formed by the first joint part 111, the joint part 131a, and the second joint part 121. The joint part 131a is formed with a hole of a size capable of inserting the flange 161a.

[0038] By providing the flange 161 a in this manner, even if the resin of the resin plate 13 deteriorates, the flange 161 a can maintain the distance between the first metal plate 11 and the second metal plate 12 , thereby suppressing loosening of the rivet compared to a case where the flange 161 a is not provided.

[0039] In addition, the rivet 16a has two end portions 162a that form a hollow space H16 at both ends in the axial direction F2, and the two end portions 162a are pushed into the hollow space H16. According to this mode, the two ends of the rivet deformed by the riveting process can be released into the hollow space H16, so that the protrusion of the rivet can be made smaller than the case where the hollow space H16 is not formed. In addition, if the size of the hollow space H16 is large enough, the protrusion from the first outer surface 114 of the first metal plate 11 and the second outer surface 124 of the second metal plate 12 can be completely eliminated.

[0040] In addition, the plurality of joints provided in the overlapping region of the guide rods can be joined by pressing the resin plate 13 against the minute projections and depressions provided on the first inner side surface 113 of the first metal plate 11 and the second inner side surface 123 of the second metal plate 12. In this manner, it is possible to prevent projections and depressions from being generated on the outer surfaces (the first outer surface 114 and the second outer surface 124) of the joints (the first joint portion 111 and the second joint portion 121) of the metal plates (the first metal plate 11 and the second metal plate 12).

[0041] The shape of the resin plate is not limited to the shape described in the embodiment. Figure 8 It is a figure which shows an example of the resin plate of a different shape. Figure 8 Shows that it has Figure 4 The guide rod 10b of the resin plate 13b having a different shape from the resin plate 13 shown in the figure is a guide rod 10b of the resin plate 13b having a different shape from the resin plate 13 shown in the figure. Figure 4 The first filling part 135 and the second filling part 136 shown have only the central part 134. Even in this case, the effect of the lubricating oil can be improved as in the case of the resin plate 13. In addition, the weight can be further reduced compared to the case of having the first filling part 135 and the second filling part 136.

[0042] The shape of the metal plate is not limited to the shape described in the embodiment. For example, the core may not be removed. Even in this case, the weight can be reduced by using a resin plate compared to the case where the entire plate is made of metal plates, and the effect of the lubricating oil can be improved. In addition, the shape of the guide rod is not limited to the shape described in the embodiment. For example, a replaceable sprocket may be provided at the front end of the guide rod.

[0043] The manufacturing method of the guide rod 10 is not limited to the method described in the embodiment. Figure 5 The metal mold is formed by placing the first joint part 111 and the second joint part 121 in a sealed manner to prevent the synthetic resin from flowing therein. Then, the resin plate 13 can be formed by pouring the heated and molten synthetic resin into the metal mold and cooling it.

[0044] <Additional Notes> Furthermore, it can also be provided by the various methods described below.

[0045] (1) A guide bar comprising three plate-like members, namely a first metal plate, a second metal plate, and a resin plate, wherein a first surface of the resin plate contacts a first inner surface of the first metal plate, and a second surface of the resin plate contacts a second inner surface of the second metal plate, wherein a plurality of locations in a region where the three plate-like members overlap are provided with joint portions for integrally joining the three plate-like members, and a groove for passing a saw chain is formed by a side surface of the resin plate, the first inner surface, and the second inner surface.

[0046] According to this aspect, the joint portion of the guide rod can be made less likely to be damaged.

[0047] (2) In the guide rod described in the above (1), the joint portion is joined by rivets.

[0048] According to this aspect, bonding can be performed without causing the resin to dissolve.

[0049] (3) In the guide rod described in (2) above, the rivet has a flange at the center in the axial direction, and the flange has the same thickness as that of the resin plate in the region where the three plate-like members overlap.

[0050] According to this aspect, even if the resin deteriorates, loosening of the rivet can be suppressed.

[0051] (4) In the guide rod described in (3) above, the rivet has two end portions forming hollow spaces at both ends in the axial direction, and the two end portions are pushed into the hollow spaces.

[0052] According to this embodiment, the protrusion of the rivet can be further reduced.

[0053] (5) In the guide rod described in (1), the joining portion is achieved by pressing a resin plate against projections and depressions provided on the first inner side surface and the second inner side surface.

[0054] According to this aspect, it is possible to prevent the occurrence of irregularities on the outer surfaces of the joining portions of the metal plates.

[0055] (6) In the guide rod described in any one of (1) to (5) above, the first metal plate and the second metal plate are removed at the center, and the resin plate has a shape that fills the removed space between the first metal plate and the second metal plate.

[0056] According to this embodiment, it is possible to prevent sawdust from being accumulated in the removed space.

[0057] (7) A chain saw comprising the guide bar according to any one of (1) to (6), the chain saw comprising a saw chain passing through the groove of the guide bar, and a driving unit driving the chain saw. Of course, the present invention is not limited to this. Furthermore, the above-described embodiments and modifications may be arbitrarily combined and implemented.

[0058] Finally, although various embodiments according to the present invention have been described, these embodiments are presented as examples and do not limit the scope of the present invention. New embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the present invention. The embodiments and their variations are included in the scope and spirit of the present invention, and are also included in the scope of the invention described in the claims and their equivalents. Description of Reference Numerals

[0059] 1: chain saw; 3: working part; 4: saw chain; 10: guide rod; 11: first metal plate; 12: second metal plate; 13: resin plate; 16: rivet; 100: plate-shaped member; 111: first joint portion; 112: first cored portion; 113: first inner side surface; 114: first outer surface; 121: second joint portion; 122: second cored portion; 123: second inner side surface; 124: second outer surface; 131: joint portion; 132: first surface; 133: second surface; 134: central portion; 135: first filling portion; 136: second filling portion; 137: side surface; 161a: flange; 162a: front end portion.

Claims

1. A guide rod, characterized in that: The guide rod includes three plate-shaped members: a first metal plate, a second metal plate, and a resin plate. The first surface of the resin plate is in contact with the first inner surface of the first metal plate, The second surface of the resin plate is in contact with the second inner surface of the second metal plate, A plurality of locations in the region where the three plate-like members overlap are provided with joint locations for joining the three plate-like members into one. A groove through which a saw chain passes is formed by the side surface of the resin plate, the first inner side surface, and the second inner side surface.

2. The guide rod according to claim 1, characterized in that: The joining points are joined by rivets.

3. The guide rod according to claim 2, characterized in that: The rivet has a flange at the center in the axial direction, and the flange has the same thickness as that of the resin plate in the region where the three plate-like members overlap.

4. The guide rod according to claim 3, characterized in that: The rivet has two end portions forming a hollow space at both ends in the axial direction, and the two end portions are pushed into the hollow space.

5. The guide rod according to claim 1, characterized in that: The joining portion is joined by pressing the resin plate against projections and depressions provided on the first inner side surface and the second inner side surface.

6. The guide rod according to any one of claims 1 to 5, characterized in that The centers of the first metal plate and the second metal plate are removed, The resin plate has a shape that fills the removed spaces of the first metal plate and the second metal plate.

7. A chain saw comprising the guide bar according to any one of claims 1 to 6, characterized in that: The chain saw has: a saw chain passing through the groove of the guide bar; and The driving unit drives the chain saw.

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