JP2011246210A - Head guard and forklift having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head guard capable of reducing weight, and capable of preventing generation of rust, and a forklift having the head guard.SOLUTION: This head guard 10a of the forklift includes a pair of right-left pillars 11b and 11a, a pipe 12 arranged on the upper end of the pillars 11a and 11b and extending in the substantially horizontal direction, and a roof 13 fixed to the right-left pipes 12. The roof 13 has first through-holes 16 on roof side installation surfaces 13c opposed to the pipes 12. The pipe 12 has second through-holes 17 communicating with the first through-holes 16 on a pipe side installation surface 12c opposed to the roof side installation surface 13c. The roof 13 and the pipe 12 are fixed in a state of allowing the roof side installation surface 13c and the pipe side installation surface 12c to abut on each other by connecting members 15 inserted into the first through-holes 16 and the second through-holes 17 and fixing members 14a arranged on the reverse side 12d of the pipe side installation surface 12c.

Description

  The present invention relates to a head guard and a forklift provided with the head guard.

  Conventionally, as a head guard for a forklift, one shown in FIG. 8 is known (for example, see Patent Document 1). As shown in the figure, the conventional head guard includes a pair of left and right pillars 1, a pipe 2 extending in a substantially horizontal direction provided at the upper end of the pillar 1, and a roof 3 provided between the left and right pipes 2. Is provided. A fixing member 4 made of a metal plate for attaching the roof 3 is welded to the inner surface of the pipe 2, and a plurality of bolt screw holes are formed in the fixing member 4. As shown in FIG. 9, the roof 3 and the fixing member 4 are connected and fixed by a connecting member such as a bolt 5.

  Incidentally, the frictional force generated between the roof 3 and the fixing member 4 is proportional to the contact area between the roof 3 and the fixing member 4. If the frictional force is small, the roof 3 is likely to vibrate while the forklift is traveling, and as a result, a load is applied to the bolt 5. For this reason, in the head guard, in order to increase the frictional force generated between the roof 3 and the fixing member 4, the fixing member 4 is welded to substantially the entire inner surface of the pipe 2, so that the roof 3 and the fixing member are welded. The contact area with 4 is made as large as possible.

Japanese Patent Laid-Open No. 2002-20086

  However, in the above head guard, it is possible to reduce the load on the bolt 5 by welding the fixing member 4 to substantially the entire inner surface of the pipe 2, but on the other hand, the fixing member 4 becomes heavy and the pipe 2 or There was a problem that the pillar 1 was burdened.

  Moreover, in the said head guard, since the welding part of the pipe 2 and the fixing member 4 is exposed to external air, the rust generate | occur | produced in this welding part under the influence of rain water etc. For this reason, there is a problem that rust juice drops from the welded portion and damages the appearance of the head guard, or a process such as sealing the bottom of the welded portion to prevent the rust juice from dripping is required, increasing the cost. The problem of being connected to was occurring.

  This invention is made | formed in view of the said situation, The place made into the subject is providing the forklift provided with the head guard which can reduce generation | occurrence | production of rust with light weight, and this head guard. is there.

  In order to solve the above problems, a head guard according to the present invention includes a forklift that includes a pair of left and right pillars, a pipe that is provided at an upper end of the pillar and extends in a substantially horizontal direction, and a roof that is fixed to the left and right pipes. The roof has a first through hole in the roof side mounting surface facing the pipe, and the pipe communicates with the first through hole in the pipe side mounting surface facing the roof side mounting surface. The roof and the pipe have two through-holes, and the roof-side attachment surface includes a connecting member inserted into the first through-hole and the second through-hole, and a fixing member provided on the back side of the pipe-side attachment surface. The pipe-side mounting surface is fixed in contact with the pipe-side mounting surface. The substantially horizontal direction includes not only a strictly horizontal direction but also a diagonally upward direction and a diagonally downward direction from the horizontal direction, and allows a width of about ± 45 degrees with respect to the horizontal direction.

  According to this configuration, since the fixing member is provided on the back side (inside the pipe) of the pipe-side mounting surface, the welded portion between the pipe and the fixing member is not easily affected by rainwater or the like, and rust is not easily generated. Become. Further, according to this configuration, since the roof and the pipe are fixed in contact with each other, there is no need to consider the contact area between the roof and the fixing member, and the size of the fixing member is reduced to reduce the weight. Can be lightened.

  The fixing member is preferably welded to the back side of the pipe-side mounting surface by laser welding. According to this structure, since a pipe and a fixing member can be welded from the pipe side attachment surface side (front side), time and labor required for welding can be reduced.

  The connecting member can be, for example, a bolt, and the fixing member can be, for example, a nut that is screwed into the bolt.

  Moreover, the said connection member can be used as a volt | bolt, for example, and the said fixing member can be used as the metal plate in which the bolt screwing hole screwed to a volt | bolt was formed, for example.

  Furthermore, when the fixing member is a metal plate, it is preferable that a positioning convex portion that engages with the second through hole of the pipe is formed on the metal substrate. According to this configuration, the metal substrate can be easily positioned from the back side of the pipe-side mounting surface.

  Further, the second through hole of the pipe and the metal plate can both have a shape having a longitudinal direction and a short direction in plan view, and the longitudinal direction of the second through hole and the longitudinal direction of the metal plate are When matched, the metal plate can be inserted from the second through hole, and when the short direction of the second through hole and the long direction of the metal plate are matched, the metal plate cannot be inserted from the second through hole. It can be set as the shape which becomes.

  According to this configuration, the metal plate can be easily inserted into the pipe from the second through hole by matching the longitudinal direction of the second through hole of the pipe with the longitudinal direction of the metal plate. By rotating the plate 90 degrees so that the short direction of the second through hole and the longitudinal direction of the metal plate coincide with each other, the pipe and the metal plate can be laser-welded. The time required for laser welding can be shortened.

  A forklift according to the present invention includes the head guard.

  According to the present invention, it is possible to provide a head guard that is light in weight and capable of reducing the occurrence of rust, and a forklift that includes the head guard.

It is a side view of the forklift concerning the present invention. It is a disassembled perspective view of the head guard which concerns on the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a head guard which concerns on the 1st Embodiment of this invention, Comprising: (a) is a side view which shows the relationship between a fixing member and a pipe, (b) is AA sectional drawing of (a). It is a figure for demonstrating laser welding, Comprising: (a) is sectional drawing during laser welding, (b) is a side view after laser welding. It is a head guard which concerns on the 2nd Embodiment of this invention, Comprising: (a) is a side view which shows the relationship between a fixing member and a pipe, (b) is BB sectional drawing of (a). It is a head guard which concerns on the 3rd Embodiment of this invention, Comprising: (a) is a side view which shows the relationship between a fixing member and a pipe, (b) is CC sectional drawing of (a). It is a head guard which concerns on the 4th Embodiment of this invention, Comprising: (a) is a side view which shows the relationship between a fixing member and a pipe, (b) is DD sectional drawing of (a). It is a disassembled perspective view of the conventional head guard. It is EE sectional drawing of FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
As shown in FIG. 1, a forklift 20 according to the present invention includes a battery-driven vehicle main body 21, a mast 22 erected on the front of the vehicle main body 21, and an elevator body 23 on the mast 22. A fork 24 arranged to be able to move up and down, a counterweight 25 attached to the rear part of the vehicle main body 21, and a head guard 10a according to the first embodiment of the present invention attached to the upper part of the vehicle main body 21. Yes.

  As shown in FIG. 2, the head guard 10a according to this embodiment includes a pair of left and right pillars 11 including a front pillar 11a and a rear pillar 11b, and a hollow cylinder provided in a substantially horizontal direction continuously from the upper end of the front pillar 11a. And a roof 13 fixed between the left and right pipes 12. As shown in the figure, the right pipe 12 and the right end portion of the roof 13 are arranged at a predetermined interval so that the rope for lifting the battery can move freely in the vehicle width direction. It is divided.

  The roof 13 has a plurality of first through holes 16 in the roof side mounting surface 13c facing the pipe 12, and the pipe 12 communicates with the first through holes 16 in the pipe side mounting surface 12c facing the roof side mounting surface 13c. A plurality of second through holes 17 are provided.

  As shown in FIG. 3, the roof 13 and the pipe 12 include a bolt 15 that is a connecting member inserted into the first through hole 16 and the second through hole 17, and a back side 12 d of the pipe side mounting surface 12 c (of the pipe 12. The roof side mounting surface 13c and the pipe side mounting surface 12c are fixed to each other by a nut 14a which is a fixing member provided in the interior). The nut 14 a is formed with a bolt screwing hole that is screwed into the bolt 15.

  The pipe 12 and the nut 14a are fixed to each other by laser welding. In this laser welding, as shown in FIG. 4, the laser 30 is irradiated from the pipe side mounting surface 12c side of the pipe 12 in a state where the second through hole 17 of the pipe 12 and the bolt screw hole of the nut 14a communicate with each other. Is done. When the laser 30 is irradiated, the pipe 12 is first heated and melted locally, and then the nut 14a is heated and melted locally. Thereafter, the melted portion of the pipe 12 and the melted portion of the nut 14a are mixed and solidified to form the welded portion 18.

  As described above, according to the head guard 10a according to the present embodiment, the nut 14a as the fixing member is laser-welded to the back side 12d (inside the pipe 12) of the pipe-side mounting surface 12c. The welded portion 18 with 14a is not easily affected by rainwater or the like, and the welded portion 18 is less likely to be rusted. Furthermore, according to the head guard 10a according to the present embodiment, the roof-side mounting surface 13c and the pipe-side mounting surface 12c are fixed in contact with each other, so that the contact area between the roof 13 and the fixing member is taken into consideration. Therefore, it is possible to use the light nut 14a as the fixing member. As a result, the burden on the pipe 12 and the pillar 11 can be reduced.

[Second Embodiment]
As shown in FIG. 5, the head guard 10b according to the second embodiment of the present invention has the same configuration as the head guard 10a according to the first embodiment except that the fixing member is a metal plate 14b. is doing.

  As shown in the figure, the head guard 10 b according to the present embodiment includes the same number of metal plates 14 b as the second through holes 17 formed in the pipe 12. The metal plate 14 b has a bolt screwing hole that is screwed into the bolt 15, and the back side of the pipe-side attachment surface 12 c of the pipe 12 in a state where the bolt screwing hole and the second through hole 17 of the pipe 12 communicate with each other. Laser welded to 12d.

  Therefore, according to the head guard 10b according to the present embodiment, since the roof side mounting surface 13c and the pipe side mounting surface 12c are fixed in contact with each other, the metal plate used in the conventional head guard is used. A much smaller metal plate 14b can be used as compared to (fixing member 4). As a result, the burden on the pipe 12 and the pillar 11 can be reduced. Furthermore, according to the head guard 10b according to the present embodiment, since the metal plate 14b is welded to the back side 12d of the pipe-side mounting surface 12c, similarly to the head guard 10a according to the first embodiment, the welded portion 18 is used. It is possible to reduce the occurrence of rust.

[Third Embodiment]
As shown in FIG. 6, in the head guard 10c according to the third embodiment of the present invention, the convex portion 19 for positioning is formed on the metal plate 14c, and the second through hole 17c of the pipe 12 is The head guard 10b has the same configuration as that of the head guard 10b according to the second embodiment except that it is formed in a shape that can be engaged with the convex portion 19.

  As shown in the figure, the positioning projections 19 are two columnar protrusions formed symmetrically across a bolt screw hole formed in the metal plate 14c. Further, the convex portion 19 is formed at a height that does not exceed the thickness of the pipe 12.

  Therefore, according to the head guard 10c according to the present embodiment, the second through hole 17c of the pipe 12 and the metal plate can be easily engaged by engaging the convex portion 19 of the metal plate 14c with the second through hole 17c of the pipe 12. Positioning before welding with the bolt screw hole of 14c can be performed.

[Fourth Embodiment]
As shown in FIG. 7, the head guard 10d according to the fourth embodiment of the present invention has a shape in which the second through hole 17d of the pipe 12 and the metal plate 14d both have a longitudinal direction and a short direction in plan view. The head guard 10b has the same configuration as that of the head guard 10b according to the second embodiment except that the head guard 10b is formed.

  As shown in the figure, in the head guard 10d according to the present embodiment, the short direction of the second through hole 17d coincides with the long direction of the metal plate 14d, and the bolt screw hole of the metal plate 14d and the pipe 12 are aligned. The metal plate 14d is laser-welded to the back side 12d of the pipe-side attachment surface 12c of the pipe 12 in a state where the second through-hole 17d is in communication.

  Further, the second through hole 17d of the pipe 12 is formed in such a size that the metal plate 14d can be inserted when the longitudinal direction of the second through hole 17d and the longitudinal direction of the metal plate 14d are matched. . That is, the short direction of the second through hole 17d is larger than the short direction of the metal plate 14d.

  Therefore, according to the head guard 10d according to the present embodiment, the metal plate 14d can be easily attached to the second through-hole 17d by matching the longitudinal direction of the second through-hole 17d of the pipe 12 with the longitudinal direction of the metal plate 14d. The metal plate 14d can be inserted into the pipe 12 by rotating the metal plate 14d by 90 degrees after the insertion so that the short direction of the second through hole 17d and the longitudinal direction of the metal plate 14d coincide with each other. Laser welding can be performed on the rear side 12d of the twelve pipe-side mounting surfaces 12c. For this reason, according to the head guard 10d which concerns on this embodiment, the effort which positions a metal plate can be saved and the time concerning laser welding can be shortened.

  Although preferred embodiments of the present invention have been described above, the present invention is not limited to these configurations.

  For example, in each of the above embodiments, the nut 14a and the metal plates 14b to 14d are used as the fixing member and the bolt 15 is used as the connecting member. However, the roof 13 and the pipe 12 can be fixed. If there is, it can be changed arbitrarily.

  In each of the above embodiments, the nut 14a and the metal plates 14b to 14d are welded to the pipe 12 by laser welding. However, the nut 14a and the metal plates 14b to 14d can be fixed to the pipe 12. Other methods may be used.

  Furthermore, the size and shape of the nut 14a and the metal plates 14b to 14d in each of the above embodiments, and the size and shape of the convex portion 19 of the metal plate 14c in the third embodiment are arbitrarily changed. Can do.

  In addition, it is of course possible to make various design changes and modifications within the scope of the claims attached to this specification.

1, 11 Pillar 2, 12 Pipe 3, 13 Roof 4 Fixing member 5, 15 Bolt (connection member)
10a to 10d Head guard 14a Nut (fixing member)
14b-d Metal plate (fixing member)
16 1st through-hole 17, 17c, 17d 2nd through-hole 18 Welding part 19 Convex part 20 Forklift 21 Vehicle main body 22 Mast 23 Lifting body 24 Fork 25 Counterweight 30 Laser

Claims (7)

A head guard for a forklift comprising a pair of left and right pillars, a pipe extending in a substantially horizontal direction provided at an upper end of the pillar, and a roof fixed to the left and right pipes,
The roof has a first through hole on a roof side mounting surface facing the pipe,
The pipe has a second through hole communicating with the first through hole on a pipe side mounting surface facing the roof side mounting surface.
The roof and the pipe include the connecting member inserted into the first through hole and the second through hole, and a fixing member provided on the back side of the pipe side mounting surface, and the roof side mounting surface and the pipe. A head guard characterized by being fixed in a state where the pipe side mounting surface is in contact therewith.   The head guard according to claim 1, wherein the fixing member is welded to the back side of the pipe-side mounting surface by laser welding. The connecting member is a bolt;
The head guard according to claim 1, wherein the fixing member is a nut screwed into the bolt. The connecting member is a bolt;
The head guard according to claim 1, wherein the fixing member is a metal plate in which a bolt screwing hole to be screwed into the bolt is formed.   The head guard according to claim 4, wherein the metal plate is formed with a positioning projection that engages with the second through hole of the pipe. The second through hole and the metal plate of the pipe are both formed in a shape having a longitudinal direction and a short direction in plan view,
When the longitudinal direction of the second through hole matches the longitudinal direction of the metal plate, the metal plate can be inserted from the second through hole, and the short direction of the second through hole and the metal plate 5. The head guard according to claim 4, wherein the metal plate cannot be inserted from the second through hole when the longitudinal direction coincides with the longitudinal direction.   A forklift comprising the head guard according to any one of claims 1 to 6.

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