JP4555252B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with a canopy that covers an operator sitting on a driver's seat.

  In general, a hydraulic excavator or the like is known as a typical model of a construction machine having a canopy. This hydraulic excavator is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an up-and-down movement that can be moved up and down on the front side of the upper revolving body. It is roughly constituted by a working device.

  Here, the upper swing body includes a swing frame on which a work device is attached on the front side, a driver seat provided on the swing frame on which an operator is seated, and a weight balance between the work device provided on the rear side of the swing frame. And a canopy provided so as to cover the upper side of the driver's seat.

  Further, the excavator canopy has two pillars that are located on the rear side of the driver's seat and extend upward and downward. The two pillars are provided with a roof that protrudes forward from the upper part of the two pillars. There is a formula canopy (see, for example, Patent Document 1). In addition, there are two rear struts located on the rear side of the driver's seat and extending upward and downward and one front strut located on the front portion of the floor board and extending upward and downward. There is a three-column type canopy provided with a roof at the top (see, for example, Patent Document 2). Further, the canopy includes a four-post canopy having two rear struts and two front struts.

JP 2002-206255 A JP 11-336126 A

  Further, the two-column canopy according to Patent Document 1 is provided with a leg portion that is located on the rear side of the driver seat and attached to the engine cover, a column that is fitted to the leg portion and extends upward, and a driver seat It is comprised by the roof provided in the upper part of this support | pillar so that the upper part might be covered, and it was provided in the front side.

  By the way, the two-column canopy according to the invention of Patent Document 1 is formed using a thick pipe member having a large diameter and having strength so that the two columns supporting the roof in a cantilever state are not easily deformed. is doing. On the other hand, since the three-post canopy according to Patent Document 2 can obtain sufficient strength by supporting the roof in a both-ends-supported state with the three pillars, the diameter is smaller than the pillar of the two-post canopy. It can be formed using a pipe member. Similarly to the three-column canopy, the four-column canopy can be formed using a thin pipe member. Thus, the diameter dimension of the support column used for the two-column canopy is different from the diameter dimension of the support column used for the four-column canopy.

  Therefore, when the three-column canopy is attached to the revolving frame side using the legs, as in the two-column canopy according to Patent Document 1, the two-column canopy, the three-column canopy, Legs for attaching column canopy columns must be prepared for columns with different diameters. For this reason, there is a problem that the number of parts increases and assembly workability also decreases.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to reduce the number of parts and improve the assembly workability by sharing the legs with a plurality of types of canopies. Is to provide a construction machine.

  A construction machine according to the present invention includes a frame on which a working device is mounted as a support structure, a driver seat that is provided on the frame and on which an operator sits, and is mounted on an object to be mounted on the frame side and above the driver seat. A canopy covering the leg, the leg positioned on the rear side of the driver's seat and attached to the attachment object, and the lower side attached to the leg and extending upward. It consists of a column that is located above and to which a roof is attached.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that the legs are mounted on the mounting base fixed to the mounting object, and the stage is directed upward from the mounting base. A plurality of stepped portions having a small diameter, and a lower end portion of the support column is configured by a fitting projection that is fitted from the outside, and the fitting projection includes a plurality of types of canopies. The lower end side is configured to selectively fit to any one of the steps.

  According to a second aspect of the present invention, the stepped portions of the fitting protrusions are arranged concentrically as viewed from above.

  According to a third aspect of the present invention, the fitting protrusion is formed in a smooth arc shape between the stepped portions.

  According to the invention of claim 4, the attachment object on the frame side is a counterweight provided on the rear side of the frame in order to balance the weight with the work device, and the leg of the canopy is The configuration is such that it is attached to the counterweight.

  According to the invention of claim 5, the canopy is a two-post canopy that supports the roof with two large-diameter posts, and a three-post type or four that supports the roof with two small-diameter rear posts and the front post. A column type canopy is prepared, and the large-diameter column of the two-column type canopy is fitted from the outside to the large-diameter step portion of the fitting protrusion of the leg, and the small diameter of the three-column type or the four-column type canopy The rear post has a configuration in which the leg is used as a common part in a plurality of types of canopies by fitting and attaching to the small-diameter step portion of the fitting protrusion from the outside.

  According to the first aspect of the present invention, the leg of the canopy is provided with a fitting projection on the mounting base, and the fitting projection is provided with a plurality of stepped portions that gradually decrease in diameter toward the upper side. It is said. Therefore, for example, a thick column having a large diameter dimension (inner diameter dimension) used for a two-column canopy is fitted (externally fitted) from the outside to a stepped part having a large diameter dimension located on the lower side of the fitting projection. It can be securely mounted with high mounting strength. On the other hand, a thin column having a small diameter (inner diameter) used for a three-column canopy and a four-column canopy is fitted to a step having a small diameter positioned above the fitting protrusion, Similarly, it can be reliably mounted with high mounting strength.

  As a result, a common leg can be used for the two-post canopy, the three-post canopy, and the four-post canopy, so the legs can be shared by multiple types of canopies, and the number of parts can be reduced. As a result, assembly workability can be improved.

  According to invention of Claim 2, since each step part of a fitting protrusion is arrange | positioned concentrically when it sees from upper direction, any support | pillar fitted to a different step part is arrange | positioned coaxially with a fitting protrusion. Can improve the appearance. Moreover, welding for fixing the fitting protrusion and the support can be uniformly performed over the entire circumference, and the welding strength can be increased.

  According to the invention of claim 3, since the fitting protrusion is formed in a smooth arc shape between the stepped portions, it is possible to prevent stress from being concentrated on a part of the fitting protrusion, and the strength of the fitting protrusion. The mounting strength of the column with respect to the fitting protrusion can be increased.

  According to the fourth aspect of the present invention, it is possible to use the counterweight as a strength member attached to the rear side of the turning frame, attach the leg to the counterweight, and stably provide the canopy. it can.

  According to the invention of claim 5, when a large-diameter column of a two-column canopy is attached to the leg, the large-diameter step located below the fitting projection of the leg is selected and the large By fitting a large-diameter column to the diameter step portion from the outside, the large-diameter column can be attached to the common leg. On the other hand, when attaching a three-column or four-column canopy small-diameter column to the leg, a small-diameter column is fitted to the small-diameter step portion located on the upper side of the fitting projection from the outside. A small-diameter column can be attached to the leg. Thereby, one leg can be shared by a two-column type canopy and a three-column type and a four-column type canopy.

  Hereinafter, a small crawler hydraulic excavator will be described as an example of a construction machine according to an embodiment of the present invention, and will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a canopy-type hydraulic excavator. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2, and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. The working device 4 provided on the front side of the upper swing body 3 so as to be able to swing and lift, and the earth removing device 5 provided on the front side of the lower traveling body 2 are roughly configured.

  Here, the hydraulic excavator 1 can be mounted with a plurality of types of canopies 15, 31, and 41 in order to meet customer needs associated with the environment at the work site, work contents, and the like. That is, it can be selected from the below-described two-post canopy 15 shown in FIG. 1, the three-post canopy 31 shown in FIG. 2, and the four-post canopy 41 shown in FIG. It can be configured. The upper swing body 3 of the hydraulic excavator 1 includes a swing frame 6, an engine 7, a counterweight 8, a driver's seat 12, etc., and canopies 15, 31, 41, which will be described later.

  Reference numeral 6 denotes a revolving frame that forms a support structure of the upper revolving structure 3. As shown in FIG. 4, the revolving frame 6 includes a bottom plate 6A formed using a thick steel plate and the left and right vertical plates erected on the bottom plate 6A so as to extend forward and backward. 6B, left and right side frames 6C provided to extend left and right on both left and right sides of each vertical plate 6B, and a plurality of overhanging beams connecting the vertical plate 6B and the side frame 6C. 6D and a support bracket 6E that is provided at the front end portion of each of the vertical plates 6B and supports the swing type work device 4 are roughly configured.

  Reference numeral 7 denotes an engine mounted on the rear side of the revolving frame 6 (shown by a dotted line in FIGS. 1 to 3). The engine 7 drives a hydraulic pump (not shown), and is arranged in a horizontally placed state extending in the left and right directions.

  Reference numeral 8 denotes a counterweight which is located on the rear side of the engine 7 and is attached to the rear portion of the turning frame 6. The counterweight 8 balances the weight with the work device 4 and is formed as an arc-shaped heavy object whose central portions in the left and right directions protrude rearward. The counterweight 8 is an attachment object on the side of the revolving frame 6 to which canopies 15, 31, and 41 described later are attached. Further, as shown in FIG. 5, two bolt holes 8B are formed on the upper surface portion 8A of the counterweight 8 so as to be separated from each other in the left and right directions. , 17 are fastened with bolts 22.

  A seat base 9 is provided so as to cover the upper front side of the engine 7 (shown in FIG. 1 and the like), and a driver's seat 12 to be described later is mounted on the seat base 9. Reference numeral 10 denotes a floor board laid on the front side of the seat base 9, and 11 denotes an exterior cover that covers both the left and right sides of the seat base 9.

  A driver's seat 12 is mounted on a seat base 9 that is on the revolving frame 6. The driver's seat 12 is for an operator to sit on. Further, left and right work operation levers 13 for operating the work device 4 and the like are disposed on both the left and right sides of the driver seat 12. Further, on the front side of the driver's seat 12, a traveling operation lever 14 that is located at the front portion of the floor board 10 and travels the lower traveling body 2 is disposed.

  Next, three types of canopies 15, 31, 41 that can be selected and attached to the upper swing body 3 will be described. The two-column canopy 15 shown in FIGS. 1 and 5 to 12 has a configuration in which a roof 21 is supported by two columns 20 positioned on the rear side of the driver's seat 12. The three-post canopy 31 shown in FIGS. 2 and 13 to 15 includes two rear struts 32A and 32B located on the rear side of the driver's seat 12 and one front strut located in the front portion of the floor board 10. The roof 33 is supported by 32E. Further, the four-post canopy 41 shown in FIGS. 3 and 16 includes two rear struts 42A and 42B located on the rear side of the driver's seat 12 and two front struts 42E and 42F located on the front portion of the floor board 10. Thus, the roof 43 is supported. Here, although the two-column canopy 15, the three-column canopy 31 and the four-column canopy 41 have different support structures for the roofs 21, 33 and 43, the left and right legs 16, 17 described later are used as common parts. Used.

  Reference numeral 15 denotes a two-column canopy provided on the upper swing body 3. As shown in FIGS. 6 and 7, the two-post canopy 15 is composed of legs 16 and 17, columns 20 and a roof 21 which will be described later.

  Reference numeral 16 denotes a left leg attached to the left side of the counterweight 8 located on the rear side of the driver seat 12, and reference numeral 17 denotes a right leg attached to the right side of the counterweight 8. The left leg 16 and the right leg 17 constitute a common part used as a part of a three-column canopy 31 and a four-column canopy 41 described later in addition to the two-column canopy 15. . The left leg body 16 and the right leg body 17 are formed so as to be substantially symmetrical in the left and right directions, and the respective configurations are substantially the same. The same reference numerals as those of the body 16 are given, and the description thereof is omitted.

  That is, as shown in FIGS. 9 to 12, the left leg 16 extends upward while being gently inclined to the rear side from the mounting base 18 that is attached to the counterweight 8 to be attached. The mounting base 18 and the fitting protrusion 19 are integrally formed by casting or the like. The mounting base 18 is formed with two bolt insertion holes 18A through which bolts 22 to be described later for mounting the left leg 16 to the counterweight 8 are inserted.

  Moreover, the upper part of the fitting protrusion 19 is formed in the stepped cylindrical shape which becomes a small diameter in steps toward the upper side. Thereby, the upper part of the fitting protrusion 19 is a large-diameter step part 19A having a large diameter dimension on the lower side, and a small-diameter step part 19B having a small diameter dimension on the upper side. Further, the lower position of the large diameter step portion 19A is a lower tapered surface 19C, and the space between the large diameter step portion 19A and the small diameter step portion 19B is an upper tapered surface 19D. Further, the corner portions 19E to 19H from the large diameter step portion 19A to the small diameter step portion 19B are formed in a smooth convex arc shape or concave arc shape in order to avoid stress concentration.

  Further, the large-diameter step portion 19A and the small-diameter step portion 19B are arranged concentrically as viewed from above, and thereby, a two-column canopy 15 described later that fits (externally fits) to the large-diameter step portion 19A from the outside. The support column 20 and the rear column 32 of a three-column canopy 31 described later that fits around the small-diameter step portion 19 </ b> B can also be arranged coaxially with the fitting protrusion 19.

  Reference numeral 20 denotes a support of the two-post canopy 15. A lower side of the column 20 is attached to the legs 16 and 17 and extends upward, and a roof 21 described later that covers the upper side of the driver's seat 12 is attached to the upper side. Moreover, the support | pillar 20 is formed by giving a desired bending process to a hollow pipe member. As shown in FIGS. 6 and 7, the support column 20 is positioned on the left rear side of the driver seat 12 and extends upward from the left leg 16, and is positioned on the right rear side of the driver seat 12. A right column 20B that extends upward from the right leg 17 and roof mounting portions 20C and 20D that are bent upward from the upper portions of the columns 20A and 20B toward the driver's seat 12 and extend forward.

  Further, for example, as shown in FIG. 8, in the left support 20A, the outer fitting portion 20A1 on the lower end side is fitted to the large-diameter step portion 19A of the fitting projection 19 from the outside. By being welded, the left leg 16 is integrally fixed. The right support 20B is also fixed integrally to the right leg 17 in the same manner as the left support 20A.

  Here, the strut 20 must use only the two left struts 20A and the right strut 20B located on the rear side and firmly support a roof 21 described later in a cantilever state. For this reason, the left strut 20A and the right strut 20B are formed using thick pipe members having a large diameter dimension (inner diameter dimension).

  Reference numeral 21 denotes a roof provided at an upper position of the support 20, and the roof 21 covers the upper side of the operator seated on the driver's seat 12. The roof 21 is mounted on the roof mounting portions 20 </ b> C and 20 </ b> D of the column 20, so that the roof 21 is mounted on the upper part of the column 20 in a cantilever state projecting forward.

  The two-column canopy 15 is formed by welding the left column 20A and the right column 20B of the column 20 to the left and right legs 16 and 17, and by attaching the roof 21 on the upper roof mounting portions 20C and 20D. Can be assembled. Further, the two-column canopy 15 assembled in this way has left and right legs 16 and 17 arranged on the upper surface 8A of the counterweight 8 as shown in FIG. The bolt 22 inserted through the insertion hole 18 </ b> A is screwed into the bolt hole 8 </ b> B of the counterweight 8, so that it can be firmly attached to the counterweight 8.

  Next, reference numeral 31 denotes a three-column canopy that can be provided in the upper swing body 3 in place of the two-column canopy 15 (see FIG. 2). As shown in FIGS. 13 and 14, the three-post canopy 31 includes the above-described legs 16 and 17 that are parts common to the two-post canopy 15, a column 32 and a roof 33 described later. .

  Reference numeral 32 denotes a support of a three-post canopy 31. As shown in FIG. 15, the support column 32 is positioned on the left rear side of the driver seat 12 and extends upward from the left leg body 16, and the right leg body is positioned on the right rear side of the driver seat 12. A right rear column 32B extending upward from 17; left and right roof mounting portions 32C and 32D bent upward from the upper portions of the columns 32A and 32B and extending to the front side; and a right roof mounting portion. The lower end of the 32D is bent from the front end of the 32D and extends downward, and the lower end thereof is roughly constituted by a right front support 32E attached to the front of the floor board 10. The support column 32 is formed by subjecting a hollow pipe member to a desired bending process in substantially the same manner as the support column 20 of the two-column canopy 15 described above.

  However, the pillars 32 of the three-post canopy 31 can support a roof 33 (described later) in a dual-supported state with a total of three rear pillars 32A and 32B and one right front pillar 32E. Therefore, the column 32 can be formed by using a thin pipe member having a small diameter (inner diameter) compared to the column 20 of the two-column canopy 15 that cantilever-supports the roof 21 with only two columns. .

  In this way, the support column 32 formed by using a thin pipe member having a small diameter dimension (inner diameter size), the outer fitting portions 32A1 and 32B1 at the lower end portions of the left rear support column 32A and the right rear support column 32B are connected to the fitting projection 19. By fitting into the small-diameter step portion 19B and welding, for example, over the entire circumference in this fitted state, the leg portions 16 and 17 are integrally fixed.

  Reference numeral 33 denotes a roof provided on the upper side of the support column 32, and the roof 33 covers the upper side of the operator seated on the driver's seat 12. The roof 33 is mounted on the left and right roof mounting portions 32C and 32D, and is supported by the three support columns 32A, 32B, and 32E in a supported state.

  The three-column canopy 31 is formed by welding the left rear column 32A and the right rear column 32B of the column 32 to the left and right legs 16, 17 and mounting the roof 33 on the roof mounting portions 32C, 32D. Can be assembled. Further, the three-column canopy 31 assembled in this way has the left and right legs 16 and 17 attached to the upper surface portion 8A of the counterweight 8 and the right front column 32E attached to the front portion of the floor board 10 so that the counter The weight 8 and the floor board 10 can be firmly attached.

  Next, reference numeral 41 denotes a four-column canopy that can be provided in the upper swing body 3 in place of the two-column canopy 15 and the three-column canopy 31 (see FIG. 3). As shown in FIG. 16, the four-post canopy 41 includes the above-described legs 16 and 17, which are parts common to the two-post canopy 15 and the three-post canopy 31, a post 42 and a roof 43 described later. Has been.

  Reference numeral 42 denotes a support of a four-post canopy 41. The column 42 is located on the left rear side of the driver seat 12 and extends upward from the left leg 16, and the right column 42 A located on the right rear side of the driver seat 12 and extends right from the right leg 17. The rear column 42B, the left and right roof mounting portions 42C and 42D that are bent upward from the upper portion of the respective columns 42A and 42B and extend forward, and the left and right roof mounting portions 42C and 42D. The front end is bent substantially from the left front support 42E and the right front support 42F attached to the front part of the floor board 10 and bent downward from the front end.

  Here, the post 42 of the four-post canopy 41 can support a roof 43 (described later) in a both-sided state with a total of four rear posts 42A and 42B and two front posts 42E and 42F. . Thereby, the support | pillar 42 can be formed using a thin pipe member with a small diameter dimension (inner diameter dimension) substantially the same as the support | pillar 32 of the three-post canopy 31.

  Reference numeral 43 denotes a roof provided on the upper side of the support 42, and the roof 43 covers the upper side of the operator seated on the driver's seat 12. The roof 43 is mounted on the left and right roof mounting portions 42C and 42D, and is supported by the four columns 42A, 42B, 42E, and 42F in a both-sided manner.

  The four-column canopy 41 is formed by welding the left rear column 42A and the right rear column 42B of the column 42 to the left and right legs 16 and 17, and mounting the roof 43 on the roof mounting portions 42C and 42D. Can be assembled. Further, the four-column canopy 41 assembled in this way has left and right legs 16 and 17 attached to the upper surface portion 8A of the counterweight 8, and left and right front posts 42E and 42F attached to the front portion of the floor plate 10. Can be firmly attached to the counterweight 8 and the floor board 10.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, the hydraulic excavator 1 according to the present embodiment can be installed with one selected from a plurality of types of canopies 15, 31, and 41 in order to respond to customer needs associated with the work site environment, work content, and the like. it can. In this case, by using the left and right legs 16 and 17 as common parts for each of the canopies 15, 31 and 41, the number of parts can be reduced and erroneous assembly or the like can be prevented.

  When the hydraulic excavator 1 is assembled, the operator can travel the lower traveling body 2 by sitting on the driver's seat 12 and operating the traveling operation lever 14. Further, by operating the left and right work operation levers 13, the work device 4 and the like can be operated to perform soil excavation work and the like.

  According to the present embodiment configured as described above, the two-column canopy 15 is mounted on the left and right legs 16 and 17 attached to the counterweight 8 and on the left and right legs 16 and 17. And a roof 21 provided at an upper position of the support column 20. Each leg 16, 17 has a large-diameter step portion that gradually decreases in diameter toward the upper side. A fitting protrusion 19 having 19A and a small diameter step portion 19B is provided.

  Therefore, the thick support column 20 having a large diameter dimension (inner diameter dimension) used for the two-column canopy 15 is fitted (externally fitted) to the large diameter step portion 19A located on the lower side of the fitting projection 19 and having a large diameter dimension. ) Can be securely mounted with high mounting strength. On the other hand, the thin rear struts 32A, 32B, 42A, and 42B having a small diameter (inner diameter) used for the three-column canopy 31 and the four-column canopy 41 have a small diameter that is located above the fitting protrusion 19 and has a small diameter. By fitting to the stepped portion 19B from the outside, it can be reliably attached with high attachment strength in the same manner as the thick support column 20.

  As a result, since the common legs 16 and 17 can be used for the two-column canopy 15, the three-column canopy 31, and the four-column canopy 41, the legs 16 can be formed by a plurality of types of canopies 15, 31, and 41. , 17 can be shared. Thereby, since the kind of leg which was conventionally required for every canopy can be made into one kind, the number of parts can be reduced and assembly workability can be improved. Further, it is possible to prevent erroneous assembly during assembly work.

  Further, since the large-diameter step portion 19A and the small-diameter step portion 19B of the fitting protrusion 19 are arranged concentrically as viewed from above, the large-diameter column 20 fitted to the large-diameter step portion 19A also has a small-diameter step. The small-diameter rear struts 32A, 32B, 42A, 42B fitted to the portion 19B can also be arranged coaxially with the fitting projection 19. Thereby, each support | pillar 20, 32, 42 can be arrange | positioned coaxially with respect to the fitting protrusion 19, and the appearance in an attachment state can be made favorable. Moreover, by positioning each support | pillar 20, 32, 42 correctly with respect to the fitting protrusion 19, uniform welding can be performed over a perimeter, and welding strength can be raised.

  Moreover, each corner | angular corner part 19E-19H formed between each step part 19A, 19B of the fitting protrusion 19, and the taper surfaces 19C, 19D is formed in the smooth convex arc shape or the concave arc shape. Thereby, it is possible to prevent stress from concentrating on a part, and it is possible to increase the strength of the fitting protrusion 19 and the strength of attaching the columns 20, 32, 42 to the fitting protrusion 19.

  On the other hand, the common legs 16 and 17 constituting the canopies 15, 31 and 41 are attached to the counterweight 8 on the revolving frame 6 side. Thereby, canopy 15,31,41 can be firmly attached to the upper part of the counterweight 8 used as an intensity | strength member.

  In the embodiment, the struts 20, 32, 42 of the canopies 15, 31, 41 are formed by using hollow pipe members, and are fitted to the fitting protrusions 19 of the legs 16, 17 from the outside. The case where it did was illustrated. However, the present invention is not limited to this. For example, the support column may be formed of a solid rod-like body, and only the lower end portion that fits the fitting protrusion 19 of the legs 16 and 17 may be formed in a cylindrical shape. .

  Moreover, in embodiment, the fitting protrusion 19 of each leg 16 and 17 is diameter-reduced in two steps, 19A of large diameter steps, and the small diameter step part 19B, and thereby has a large diameter support 20 and a small diameter. The case where two types of rear struts 32A, 32B, 42A, 42B can be attached has been described as an example. However, the present invention is not limited to this. For example, the fitting protrusion is reduced in diameter in three stages of a large diameter step portion, a medium diameter step portion, and a small diameter step portion. It is good also as a structure which attaches the kind of support | pillar.

  Furthermore, in the embodiments, the crawler hydraulic excavator 1 has been described as an example of a construction machine provided with a canopy. However, the present invention is not limited thereto, and any construction machine provided with a canopy, for example, a wheel It can also be applied to other construction machines such as hydraulic excavators and wheel loaders.

It is a front view which shows the hydraulic shovel applied to embodiment of this invention in the state which attached the 2 pillar type canopy. It is a front view which shows the hydraulic excavator applied to embodiment of this invention in the state which attached the 3 pillar type canopy. It is a front view which shows the hydraulic shovel applied to embodiment of this invention in the state which attached the 4 pillar type canopy. It is an external appearance perspective view which expands and shows a turning frame and a counterweight. It is a disassembled perspective view which shows the attachment state of the 2 pillar type canopy with respect to a counterweight. It is a front view which shows a 2 column type canopy. It is a perspective view which shows a 2 column type canopy. It is sectional drawing of the principal part expansion which shows the state which welded the support | pillar of the 2 column type canopy to the large diameter step part of the fitting protrusion. It is a front view which expands and shows a left leg body alone. It is a left view which expands and shows a left leg alone. It is a perspective view which expands and shows a left leg alone. It is sectional drawing which looked at the left leg body from the arrow XII-XII direction in FIG. It is a front view which shows a 3 column type canopy. It is a perspective view which shows a 3 column type canopy. It is sectional drawing of the principal part expansion which shows the state which welded the back support | pillar of the 3 column type canopy to the small diameter step part of the fitting protrusion. It is a perspective view showing a 4-poster type canopy.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 6 Turning frame 7 Engine 8 Counterweight (object to be attached)
DESCRIPTION OF SYMBOLS 10 Floor board 12 Driver's seat 15 Two pillar type canopy 16 Left leg 17 Right leg 19 Fitting protrusion 19A Large diameter step 19B Small diameter step 19C Lower taper surface 19D Upper taper surface 19E-19H Corner corners 20, 32 42 Column 20A Left column 20B Right column 20C, 32C, 42C Left roof mounting part 20D, 32D, 42D Right roof mounting part 21, 33, 43 Roof 31 Three-column canopy 32A, 42A Left rear column 32B, 42B Right rear column 32E, 42F Right front support 41 4-post canopy 42E Left front support

Claims (5)

A frame on which a working device is mounted in the form of a support structure, a driver seat provided on the frame and seated by an operator, and a canopy attached to an object to be mounted on the frame side and covering the upper side of the driver seat; The canopy is located on the rear side of the driver's seat and attached to the attachment object, and the lower side is attached to the leg body and extends upward, and the upper side is located above the driver's seat and has a roof. In construction machinery consisting of attached struts,
The leg has an attachment base fixed to the attachment object, and a plurality of stepped portions whose diameter gradually decreases from the attachment base toward the upper side. Consists of a joint and
A construction machine characterized in that the fitting protrusion is configured such that a lower end side of the column constituting a plurality of types of canopies is selectively fitted to any stepped portion.   The construction machine according to claim 1, wherein the stepped portions of the fitting protrusions are arranged concentrically as viewed from above.   The construction machine according to claim 1, wherein the fitting protrusion is formed in a smooth arc shape between the stepped portions.   The attachment object on the frame side is a counterweight provided on the rear side of the frame to balance the weight with the work device, and the leg of the canopy is configured to be attached to the counterweight. Item 4. The construction machine according to item 1, 2 or 3. The canopy includes a two-column canopy that supports the roof with two large-diameter columns, and a three-column or four-column canopy that supports the roof with two small-diameter rear columns and a front column,
The large-diameter column of the two-column canopy is fitted from the outside to the large-diameter step portion of the fitting protrusion of the leg, and the small-diameter rear column of the three-column or four-column canopy is fitted to the fitting The construction machine according to claim 1, 2, 3, or 4, wherein the leg is used as a common part in a plurality of types of canopies by fitting and attaching to a small-diameter step portion of the protrusion from the outside.

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