JP5751429B2 - Cab guard device for construction machinery - Google Patents

Description

  The present invention relates to a cab guard device for protecting a cab from falling objects or the like in a construction machine such as a hydraulic excavator.

  In construction machines such as hydraulic excavators, a ceiling guard (upper guard) for protecting the roof including the skylight from falling objects is mounted above the roof, and a front guard (front guard) for protecting the front of the cab including the front window. ) Is attached to the front surface of the cab (see, for example, Patent Document 1).

JP 2003-170812 A

  On the other hand, in some construction machines, in order to place importance on the upper field of view from inside the cab, there is a structure in which there is no cross member on the upper front side of the cab, and the front window and the skylight are configured by a glass butt. That is, there is no cross member constituting the cab skeleton between the front window and the skylight. When an open / close ceiling guard that pivots on the front end is provided on such a cab, a long support (mounting member) is installed over the left and right beams above the cab, and a hinge member is attached to the support. Therefore, the ceiling guard is pivotably attached.

  However, since the visibility is important in the above configuration, it is disadvantageous to increase the size of the support in order to increase the strength. In such a configuration, when a load due to falling objects is applied to the ceiling guard, the strength of the support is not sufficient, and since there is no cross member, there is nothing to depend on strength, so the ceiling guard is displaced (deformed) and operated Staff may not be protected.

  Then, an object of this invention is to provide the cab guard apparatus of the construction machine which can suppress the displacement of a ceiling guard, when a load is added to a ceiling guard with a fallen object etc.

In order to achieve the above object, the present invention comprises a ceiling guard for protecting a cab upper part of a construction machine, a front guard for protecting a cab front part, and a support for attaching at least the ceiling guard to the cab, support is configured to be attached to the front end of the cab upper at both ends extending in the lateral direction, said support have a protrusion protruding into the gap between the front guard and the ceiling guard, the protrusion The construction provides a cab guard device for a construction machine characterized in that, in a state in which no load is applied to the ceiling guard, the portion projects with a gap from the upper end so as not to contact the upper end of the front guard. doing.

  Here, it is preferable that the protrusion is provided at the center in the left-right direction.

  The ceiling guard is configured to be attached to the cab so as to be rotatable about a front end portion between a closed state that covers the cab upper portion and an open state that opens the cab upper portion, and the projecting portion is the ceiling When the guard rotates in the opening direction, it preferably functions as a stopper that contacts the ceiling guard and prohibits further rotation.

  According to the cab guard device for a construction machine according to the first aspect, when a load is applied to the ceiling guard, the ceiling guard contacts the protrusion of the support, and the protrusion can contact the front guard. Therefore, since the load applied to the ceiling guard is transmitted to the front guard and / or the cab, energy due to the load is absorbed, and displacement of the ceiling guard can be suppressed.

  According to the cab guard device for a construction machine according to the second aspect, the projecting portion is provided at the center in the left-right direction. For this reason, when there is a fallen object in the vicinity of the center of the ceiling guard that is the weakest in strength, the support can efficiently receive a load, and the displacement of the ceiling guard can be further suppressed.

  According to the cab guard device for a construction machine according to the third aspect, when the ceiling guard rotates in the opening direction, the protrusion functions as a stopper that contacts the ceiling guard and prohibits further rotation. For this reason, it is not necessary to separately provide a dedicated part as a stopper for the ceiling guard, and cost can be reduced and productivity can be improved.

1 is a schematic side view showing an external appearance of a hydraulic excavator equipped with a cab guard device according to an embodiment of the present invention. The schematic perspective view which shows the cab of the hydraulic excavator equipped with the cab guard apparatus by this embodiment. The perspective view which shows the cab guard apparatus by this embodiment. The top view which shows a ceiling guard among the cab guard apparatuses by this embodiment. The perspective view which shows a support and a front guard among the cab guard apparatuses by this embodiment. The perspective view which looked at the support by this embodiment from the upper part. The perspective view which looked at the support by this embodiment from the downward direction. VIII-VIII sectional view taken on the line of FIG. IX-IX sectional view taken on the line of FIG. Sectional drawing near the center part of the left-right direction containing a front ceiling guard, a support, and a front guard. The side surface (partial cross section) figure which shows the state by which the front side guard was fully opened. In FIG. 11, the enlarged view which shows the part which the front-end part of a front side guard is contacting the protrusion part of a support.

  A cab guard device for a construction machine according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a hydraulic excavator will be described as an example of a construction machine.

  As shown in FIG. 1, the hydraulic excavator 1 includes a crawler-type lower traveling body 2A, an upper revolving body 2B mounted on the lower traveling body 2A so as to be rotatable about a vertical axis, and a front of the upper revolving body 2B. And the work attachment 3 attached to the part. The upper swing body 2B is provided with a cab (operator's cab) 4, and each operation of turning, running, and attachment operation is performed in the cab 4.

  A cab guard device 10 attached to the excavator 1 to protect the cab 4 will be described. The cab guard device 10 mainly includes a front guard 11, ceiling guards 12 and 13, and a support 20.

  The front guard 11 is provided on the front surface of the cab 4 in order to protect the front window 5 (FIG. 2) of the cab 4. On the other hand, the roof 4A of the cab 4 is provided with a skylight 6 at the front part of the roof for ensuring an upward view. In order to protect the roof 4A including the skylight 6 from falling objects, a rear ceiling guard 12 and a front ceiling guard 13 are provided on the roof 4A.

  The rear ceiling guard 12 has a substantially flat plate shape, and is fixed to the upper surface of the rear portion of the roof 4A with a bolt. The rear ceiling guard 12 is a fixed guard that is basically not removed even during cleaning or the like.

  The front ceiling guard 13 is formed in a lattice shape as a whole, and is formed in a letter shape in a side view in which the front portion is inclined downwardly so as to follow the curved surface of the front portion of the roof 4A. As shown in FIG. 4, the front ceiling guard 13 has an outer frame constituted by a front frame 13F, a rear frame 13B, a right frame 13R, and a left frame 13L, and vertical and horizontal bars constituting a lattice are arranged inside thereof. . The vertical and horizontal bars are angled so as not to obstruct the view from the driver as much as possible.

  In the hydraulic excavator 1 according to the present embodiment, in order to attach importance to the upper field of view from the inside of the cab 4, no cross member is provided on the front upper side of the cab 4, and the front window 5 and the skylight 6 are configured by a glass butt. (See FIGS. 10 and 11). That is, there is no cross member constituting the cab skeleton between the front window 5 and the skylight 6.

  As shown in FIG. 3, the front end of the front ceiling guard 13 is connected to the cab 4 via a support 20. Specifically, a long support 20 extending in the left-right direction is fixed to the front corners 4C of the left and right beams 4L, 4R above the cab 4 (front end of the cab upper part) with bolts. The front frame 13F of the front ceiling guard 13 is pivotally attached to the support 20 by left and right hinge members 15 (see also FIGS. 6 and 7). With such a configuration, the front ceiling guard 13 rotates around the hinge member 15 as a fulcrum to cover the skylight 6 as shown in FIG. 1 and FIG. 2 and FIG. 11, it can be opened and closed between an open posture (open state) at the time of cleaning that inclines backward and opens the top of the skylight 6.

  As shown in FIG. 4, left and right locking mechanisms 16 are provided at the rear end portion (rear frame 13 </ b> B) of the front ceiling guard 13. The lock mechanism 16 is engaged with a striker (not shown) provided at the front end of the rear ceiling guard 12, whereby the closed posture of the front ceiling guard 13 is maintained.

  Next, the front guard 11 will be described. As shown in FIG. 5, the front guard 11 is also configured in a lattice shape as a whole, and is formed in a letter shape in a side view along the shape of the front surface of the cab. The front guard 11 has an outer frame composed of an upper frame 11U, a lower frame 11D, a right frame 11R, and a left frame 11L, and vertical and horizontal bars that form a lattice are disposed on the inner side. Also in the front guard 11, the vertical and horizontal bars are angled so as not to obstruct the view from the driver as much as possible. In FIG. 5, the illustration of the front ceiling guard 13 is omitted.

  The front guard 11 is attached to the cab 4 so as to be laterally opened with the right end (right frame 11R side) as a rotation axis. More specifically, the upper end portion of the right frame 11R of the front guard 11 is pivotally attached to the front guard mounting portion 23 (FIG. 6) of the support 20 by the hinge member 17A. Further, the lower end portion of the right frame 11 </ b> R is pivoted by fixing the hinge member 17 </ b> B to the attachment member 17 </ b> C attached to the cab 4. With such a configuration, the front guard 11 is rotated between the hinge members 17A and 17B as a fulcrum to cover the front window 5 between the closed position (FIG. 5) during use (during operation) and the open position during cleaning. It can be opened and closed.

  Upper and lower locking mechanisms 18 </ b> A and 18 </ b> B are provided at the left end portion (left frame 11 </ b> L) of the front guard 11. The upper lock mechanism 18A engages with a striker (not shown) fixed to the striker mounting portion 24 (FIG. 6) of the support 20, and the lower lock mechanism 18B is attached to the cab 4 via an attachment member. By engaging with a striker (not shown), the closed posture of the front guard 11 is maintained.

  A front lower guard 19 is provided below the front guard 11. The front lower guard 19 is a fixed guard bolted to the cab 4.

  Next, the support 20 will be described. The support 20 is provided to attach the front ceiling guard 13 and the front guard 11 to the cab 4. As shown in FIGS. 3 and 5 to 7, the support 20 is a long member extending in the left-right direction, and includes a cab attachment portion 21 in which bolt holes for attachment to the cab 4 are formed at both ends thereof.

  The support 20 has a protrusion 22 (described later) protruding forward at the center in the left-right direction. The hinge member 15 of the front ceiling guard 13 described above is fixed in the vicinity of the middle in the left-right direction between each cab mounting portion 21 and the protruding portion 22. In other words, the protruding portion 22 is provided between the left and right hinge members 15.

  A front guard mounting portion 23 for mounting a hinge member 17A on the upper side of the front guard 11 projects downward at a position on the right end of the support 20 (left side in FIGS. 6 and 7) and below the cab mounting portion 21. It is installed. On the other hand, a striker for attaching a striker that engages with the lock mechanism 18A on the upper side of the front guard 11 at a position slightly to the center of the cab attachment portion 21 on the left end portion of the support 20 (right side in FIGS. 6 and 7). A mounting portion 24 is provided.

  Further, the general cross section of the support 20 excluding the protruding portion 22 and the mounting portion is a U-shaped cross section opened downward as shown in FIG.

  The protrusion 22 will be described in detail. As shown in FIG. 3, the protrusion 22 is provided so as to protrude into the gap between the front ceiling guard 13 and the front guard 11. As shown in the cross-sectional view of FIG. 9, the protruding portion 22 includes a flat plate portion 22A, an inclined portion 22B that is bent and extended downward at a gentle angle from the flat plate portion 22A, and the flat plate portion 22A and the inclined portion for reinforcement. It is comprised from the side-plate part 22C provided in the right-and-left both sides of the part 22B. The flat plate portion 22A and the inclined portion 22B are formed by bending a single steel plate having the same general cross section (FIG. 8), and the left and right side plate portions 22C are joined thereto by welding or the like.

  In such a configuration, when a load is applied to the front ceiling guard 13 by a fallen object or the like during operation of the hydraulic excavator 1, particularly in the vicinity of the central portion in the left-right direction of the front ceiling guard 13 is weak in strength, and displacement due to the load increases. For this reason, as shown in FIG. 10, the front frame 13F of the front ceiling guard 13 is in contact with the protruding portion 22 (the inclined portion 22B and the flat plate portion 22A) of the support 20 to transmit the load. This load is transmitted to the cab 4 via the cab mounting portion 21. When the load is further increased, the projecting portion 22 is displaced downward, and the side plate portion 22C comes into contact with the upper frame 11U of the front guard 11. As a result, the load is transmitted to the front guard 11 and further transmitted to the cab 4 via the attachment members 17A to 17C, 18A, 18B and the like of the front guard 11.

  As shown in FIGS. 3, 4, and 11, when the front ceiling guard 13 receives a load such as a fallen object from above, the rear part of the right frame 13 </ b> R and the left frame 13 </ b> L of the front ceiling guard 13 A load transmission member 14 for transmitting the load to the cab 4 is provided. Therefore, especially when there is a fallen object at the rear portion of the front ceiling guard 13 (position close to the rear frame 13B), the load transmission member 14 receives the load and transmits it to the cab 4 together with the lock mechanism 16.

  The protrusion 22 not only functions as a member that transmits a load as described above, but also functions as an opening direction stopper of the front ceiling guard 13. That is, with the front ceiling guard 13 rotated in the opening direction as shown in FIG. 11, the front frame 13F of the front ceiling guard 13 comes into contact with the inclined portion 22B of the protruding portion 22 as shown in FIG. Further rotation of the guard 13 is prohibited. When the protruding portion 22 functions as a stopper, the front frame 13F and the inclined portion 22B are configured to make surface contact (not contact with a point or a line). For this reason, it is prevented that an excessive load is applied to a part of the front frame 13F and the inclined portion 22B. The reason why the inclined portion 22B is bent at a gentle angle with respect to the flat plate portion 22A is to make surface contact with the front frame 13F of the front ceiling guard 13 when the protruding portion 22 functions as a stopper in this way. .

  According to the cab guard device 10 for a construction machine according to the present embodiment, when a load due to a fallen object or the like is applied to the front ceiling guard 13, the front ceiling guard 13 contacts the protruding portion 22 of the support 20, and the protruding portion 22 The front guard 11 can also be contacted. Therefore, since the load applied to the front ceiling guard 13 is transmitted to the cab 4 and / or the front guard 11 via the support 20, energy due to the load is absorbed, and displacement of the front ceiling guard 13 can be suppressed. .

  Moreover, the protrusion part 22 of the support 20 is provided in the center of the left-right direction. For this reason, when there is a fallen object near the center of the front ceiling guard 13 which is the weakest in strength, the support 20 can efficiently receive a load, and the displacement of the front ceiling guard 13 can be further suppressed. .

  Further, the protruding portion 22 of the support 20 functions as a stopper that contacts the front ceiling guard 13 and prohibits further rotation when the front ceiling guard 13 rotates in the opening direction. For this reason, it is not necessary to separately provide a dedicated part as a stopper for the front ceiling guard 13, and costs can be reduced and productivity can be improved.

  Moreover, since the general cross section (FIG. 8) of the support 20 has a U-shaped cross section, the rigidity becomes higher than that of, for example, an L-shaped cross section, and the load received by the protruding portion 22 of the support 20 is applied to the cab 4. Easy to communicate.

  The cab guard device for a construction machine according to the present invention is not limited to the embodiment described above, and various modifications and improvements can be made within the scope described in the claims.

  For example, in the above-described embodiment, the protruding portion 22 of the support 20 is provided at the center in the left-right direction, but may not necessarily be at the center. Moreover, the protrusion part may be provided in multiple places.

  In the above-described embodiment, the front ceiling guard 13 and the front guard 11 are attached to the support 20, but the front guard may be attached to the cab without using the support.

  In the above-described embodiment, the front ceiling guard 13 can be opened and closed by turning its front end portion as a fulcrum (rear opening). However, it is also possible to adopt a configuration in which the load is transmitted by bringing the front end portion of the ceiling guard into contact with the protruding portion of the support when a load is applied while the ceiling guard is a front opening or side opening mechanism.

  As described above, the cab guard device for a construction machine according to the present invention is useful as a cab guard device for protecting a cab and an operator of a construction machine such as a hydraulic excavator used for construction work from falling objects. .

1 hydraulic excavator, 2A lower traveling body, 2B upper turning body,
3 work attachment, 4 cab, 4A roof, 4C front corner,
4L, 4R beam, 5 front window, 6 skylight, 10 cab guard device,
11 Front guard, 12 Rear ceiling guard, 13 Front ceiling guard,
14 load transmission member, 15 hinge member, 16 lock mechanism,
17A, 17B Hinge member, 17C Mounting member, 18A, 18B Lock mechanism,
19 Front lower guard, 20 Support, 21 Cab mounting part, 22 Projection part,
22A flat plate portion, 22B inclined portion, 22C side plate portion, 23 front guard mounting portion,
24 Striker mounting part.

Claims (3)

A ceiling guard that protects the upper part of the cab of the construction machine, a front guard that protects the front part of the cab, and at least a support for attaching the ceiling guard to the cab,
The support is configured to extend in the left-right direction and be attached to the front end portion of the cab upper portion at both ends thereof ,
The support may have a protrusion protruding into the gap between the front guard and the ceiling guard,
The cab guard device for a construction machine, wherein the protruding portion protrudes at an interval from the upper end so as not to contact the upper end of the front guard when no load is applied to the ceiling guard. .   The cab guard device for a construction machine according to claim 1, wherein the protruding portion is provided at a center in a left-right direction. The ceiling guard is configured to be attached to the cab so as to be rotatable about a front end portion as a fulcrum between a closed state covering the cab upper portion and an open state opening the cab upper portion,
3. The construction machine according to claim 1, wherein the protrusion functions as a stopper that contacts the ceiling guard and prohibits further rotation when the ceiling guard rotates in the opening direction. 4. Cab guard device.

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