JP7588008B2 - Work Machine - Google Patents

Description

The present invention relates to work machines, and in particular to technology that improves maintainability.

Hydraulic excavators are generally used at work sites such as road construction sites and building sites. In particular, at work sites where it is necessary to work while visually checking the work site from a high place, work machines are used that enable the cab to be raised and lowered by a lifting mechanism including a lift cylinder in order to obtain a high eye point as required.

When performing maintenance on the underside of the cab, this type of work machine raises the cab to ensure the necessary working space to perform the work. In addition, this type of work machine is equipped with a fall prevention mechanism to prevent the raised cab from suddenly falling while maintenance is being performed (Patent Document 1).

JP 2007-106563 A

However, with the technology disclosed in the above patent document, the lock pin cannot be inserted unless the pin insertion hole in the support tower body and the pin insertion hole in the lower link are precisely aligned, which is extremely cumbersome for workers.

The present invention was made in consideration of these problems, and its purpose is to provide a work machine that makes it easy to carry out maintenance work under a cab that can be raised and lowered.

In order to achieve the above object, the present invention provides a working machine including a lower traveling body that travels a machine body, an upper rotating body that is rotatably mounted on the lower traveling body, a cab in which an operation room for operating the machine body is provided, a lifting device that raises and lowers the cab, and a limiting device that limits the descent of the cab by the lifting device, wherein the lifting device has a support member having one end disposed on the upper rotating body and the other end rotatably supporting the cab, a pivot member formed on the upper rotating body and pivotally supporting one end of the support member, and a plurality of interlocking members formed on one end of the support member and aligned along a trajectory when the support member rotates around the pivot member, and the limiting device has a locking member including a claw portion that can be locked to the locked member, The claw portion engages with the engaged member when the support member rotates and the cab descends, and allows the engaged member to move when the support member rotates and the cab rises , the upper rotating body has a flat plate member located between the lifting device and the limiting device, the flat plate member is formed with at least an opening through which the engaging member of the limiting device can pass, and a fixing plate extending from the vicinity of the opening toward the limiting device and fixing the limiting device, the fixing plate is formed with a first fixing portion that fixes the limiting device to a first position where the claw portion of the engaging member can engage with the engaged member, and a second fixing portion that fixes the limiting device to a second position that is spaced apart from the limiting device relative to the first position .

As a result, when the support member rotates and the cab is lowered, the claw portion of the locking member locks onto the locked member, and when the cab is raised, the locked member is allowed to move, making it possible to prevent the cab from lowering while allowing the cab to be raised.However , by fixing a first fixing portion to the limiting device and fixing the limiting device to a first position where the claw portion of the locking member can lock onto the locked member, and fixing a second fixing portion to the limiting device so that the limiting device can be fixed to a second position that is separated from the limiting device from the first position, it is possible to switch the fixing position of the limiting device to either the first fixing portion or the second fixing portion, thereby preventing or allowing the cab to be lowered .

The present invention also provides a working machine including a lower traveling body for traveling a machine body, an upper rotating body rotatably mounted on the lower traveling body, a cab in which an operation room for operating the machine body is provided, a lifting device for raising and lowering the cab, and a limiting device for limiting the descent of the cab by the lifting device, wherein the lifting device includes a support member, one end of which is disposed on the upper rotating body and the other end of which rotatably supports the cab, and a limiting device formed on the upper rotating body and rotatably supporting one end of the support member. The limiting device has a pivot support member and a plurality of interlocking members formed at one end of the support member and arranged along a trajectory when the support member rotates around the pivot support member, and the limiting device has a plurality of interlocking members, each of which has one claw portion that can be interlocked with the interlocking members, the claw portions being multiple in number corresponding to the multiple interlocking members, and engaging with the interlocking members when the support member rotates and the cab descends, and allowing movement of the interlocking members when the support member rotates and the cab rises.
As a result, when the support member rotates and the cab lowers, the claw portion of the locking member locks into the locked member, and when the cab rises, the locked member is allowed to move, making it possible to prevent the cab from lowering while allowing the cab to be raised, and by forming multiple claw portions, it is possible to improve the fastening ability between the claw portion and the locked member.
In another aspect, the limiting device has a pin that supports the engaging member, a support body fixed to the upper rotating body and rotatably supporting the pin, and a pressing member that presses the claw portion of the engaging member toward the engaged member, and the engaging member includes a pin connecting portion to which the pin is fixed, and a shaft portion extending from the pin connecting portion, and it is preferable that the claw portion is formed at the end of the shaft portion and extends toward the engaged member.

As a result, the pin and the locking member are rotatably supported by the support body, and the pressing member presses the claw portion, which is formed at the end of the shaft portion so as to extend toward the locked member, toward the locked member, making it possible to construct a limiting device with a relatively small number of parts and improving resistance to deterioration.

In another aspect, the first fixing portion and the second fixing portion are preferably mounting holes into which fastening members that can be screwed into the limiting device are inserted.
As a result, by making the first fixing portion and the second fixing portion into mounting holes into which fastening members that can be screwed into the limiting device are inserted, it is possible to conveniently fix the limiting device to the fixing plate while easily switching the fixed position of the limiting device.

In another aspect, it is preferable that the claw portion is formed with a retaining surface that retains the engaged member when the cab descends, and an inclined surface that abuts the engaged member when the cab rises and includes a surface inclined at a specified angle relative to the retaining surface.
This forms a retaining surface that holds the locked member in the claw portion, and an inclined surface that includes a surface inclined at a specified angle relative to the retaining surface, so that when the cab descends, the retaining surface holds the locked member, and when the cab rises, the inclined surface abuts against the locked member to allow the locked member to pass by.

According to the work machine of the present invention, the claw portion of the locking member locks into the locked member when the support member rotates and the cab is lowered, and the locked member is allowed to move when the cab is raised, thereby preventing the cab from lowering while allowing the operation of raising the cab.
This makes it easier to carry out maintenance work on the underside of the cab, which is arranged to be able to rise and fall.

FIG. FIG. FIG. FIG. 4 is an enlarged perspective view of a lock unit disposed on the back plate. 4 is a side view of the lock unit and its surroundings when the lock unit is located at a first position. FIG. 11 is a side view of the lock unit and its surroundings when the lock unit is located at a second position. FIG. 11 is an explanatory diagram illustrating an operation mode of the lock unit when the lock unit is located at a first position; FIG. 11 is an explanatory diagram illustrating an operation mode of the lock unit when the lock unit is located at a first position. FIG.

One embodiment of the present invention will be described below with reference to the drawings. For ease of explanation, the front and rear of the aircraft in the longitudinal direction will be referred to simply as the front or rear, the left and right of the aircraft in the transverse direction will be referred to simply as the left or right, and the top and bottom of the aircraft in the vertical direction will be referred to simply as the top or bottom.

Referring to FIG. 1, a side view of the machine body 1 is shown. The machine body 1 is a hydraulic shovel-type work machine that can perform excavation work and work of loading industrial waste materials and the like onto a transport vehicle (hereinafter referred to as work, etc.) by operating the front attachment 6. This machine body 1 is equipped with a lower traveling body 3, an upper rotating body 5, a cab 7, and a lifting device 9. The lower traveling body 3 is a traveling body that can be driven to make the machine body 1 travel. The upper rotating body 5 is mounted on the lower traveling body 3 so as to be able to rotate.

The cab 7 has a driver's cab (not shown) installed inside, and is configured so that an operator can board it. The lifting device 9 is a device that can raise and lower the cab 7. This allows the machine body 1 to self-propel by driving the lower running structure 3, change the orientation of the front attachment 6 and the cab 7 by rotating the upper rotating structure 5, and move the cab 7 to a position where the work site can be viewed by raising and lowering the cab 7 with the lifting device 9, and then perform work using the front attachment 6.

Here, the lifting device 9 will be described in detail. The lifting device 9 has a tower 11, a bed 13, a link unit 15, and a lift cylinder 17. The tower 11 is a pair of left and right skeletal members erected from the upper rotating body 5. The tower 11 is formed with a first rotating shaft 11a and a second rotating shaft (shaft support member) 11b that are aligned in the vertical direction and spaced a predetermined distance apart.

The bed 13 is a horizontal platform that supports the underside of the cab 7, and a link mounting portion 14 is formed at the rear end thereof, extending vertically from the bed 13. The link mounting portion 14 is a pair of left and right skeletal portions erected at a position behind the cab 7 that corresponds to the tower 11 when viewed in the left-right direction of the machine. Similar to the first rotating shaft 11a and second rotating shaft 11b, the link mounting portion 14 is formed with a third rotating shaft 14a and a fourth rotating shaft 14b that are arranged vertically at a predetermined distance apart.

The link unit 15 includes an upper link 21 and a lower link (support member) 23 that extend between the tower 11 and the bed 13. Specifically, the upper link 21 has one longitudinal end rotatably supported by the first pivot shaft 11a of the tower 11, and the other end rotatably supported by the third pivot shaft 14a of the link mounting portion 14. The lower link 23 has one longitudinal end rotatably supported by the second pivot shaft 11b of the tower 11, and the other end rotatably supported by the fourth pivot shaft 14b of the link mounting portion 14. As a result, the upper link 21 and the lower link 23 always rotate while maintaining a parallel relationship with each other, so that the link mounting portion 14 can be kept vertical, and thus the bed 13 can be kept horizontal.

The lift cylinder 17 is a hydraulic cylinder that expands and contracts hydraulically, with one end rotatably supported on a fifth pivot shaft 11c formed below the second pivot shaft 11b of the tower 11, and the other end rotatably supported on a sixth pivot shaft 23a formed vertically below the fourth pivot shaft 14b of the lower link 23. As a result, the lifting device 9 can raise and lower the cab 7 while maintaining a horizontal state by expanding and contracting the lift cylinder 17 to rotate the upper link 21 and the lower link 23 of the link unit 15.

Referring to FIG. 2, a perspective view of the lower link 23 is shown. For ease of explanation, the position of the bed 13 when the other end of the lower link 23 on the bed 13 side is located above the second pivot shaft 11b will be referred to as the raised position A, the position of the bed 13 when the other end of the lower link 23 on the bed 13 side is located below the second pivot shaft 11b will be referred to as the lowered position B, and the position of the bed 13 when the other end of the lower link 23 on the bed 13 side is located at the same height as the second pivot shaft 11b will be referred to as the horizontal position C (see FIG. 1). Also, in FIG. 2, the posture of the lower link 23 when the bed 13 is in the horizontal position C will be described.

The lower link 23 is a skeletal member that extends in the fore-aft direction. A pair of left and right first support legs 31 that extend rearward are formed on the rear side of the lower link 23 in the fore-aft direction of the machine body, i.e., on the end (one end) on the tower 11 side. In addition, a pair of left and right second support legs 32 that extend forward are formed on the front side of the lower link 23 in the fore-aft direction of the machine body, i.e., on the end (the other end) on the bed 13 side.

The first support leg 31 is formed to be located on the inner side of the tower 11 in the left-right direction of the machine body, and the first shaft portion (one end) 35 formed at the rear end is rotatably supported by the second rotating shaft 11b. The second support leg 32 is formed to be located on the inner side of the bed 13 in the left-right direction of the machine body, and the second shaft portion (other end) 37 formed at the front end is rotatably supported by the fourth rotating shaft 14b.

Furthermore, the first support leg 31 on the left side has a plurality of interlocking members 39 formed on the rear side of the first shaft portion 35. The interlocking members 39 are formed in a cylindrical shape extending in the left-right direction, and a plurality of interlocking members (e.g., four) are provided at equal intervals around the periphery of the first shaft portion 35.

Referring to FIG. 3, a rear perspective view of the tower 11 is shown. A pair of left and right towers 11 have back plates (flat plate members) 12 welded to the rear ends in the longitudinal direction of the aircraft body, extending in the left and right direction. An opening 12a is formed in the back plate 12 at a position corresponding to the locked member 39 of the first support leg 31. A pair of left and right fixing plates 12b are formed on the back plate 12 on both the left and right sides (nearby) of the opening 12a, and a lock unit 41 positioned to be inserted into the opening 12a is fixed to the fixing plates 12b. The detailed shape of the fixing plates 12b will be described later.

Referring to FIG. 4, an enlarged perspective view of the lock unit 41 arranged on the back plate 12 is shown. The lock unit (restriction device) 41 has a base plate (support) 43, a locking member 45, a biasing member 46, a reinforcing member 47, a support pin (pin) 48, and a spring (pressing member) 49. The base plate 43 is a pair of left and right flat plate members located on the inside of the pair of left and right fixed plates 12b in the left-right direction of the machine body. This base plate 43 is formed with a first support part 43a and a second support part 43b. The first support part 43a is a protrusion formed on the front end of the base plate 43, and a circular opening (not shown) is formed in the center. The second support part 43b is a pedestal that protrudes from the upper end of the base plate 43 toward the inside in the left-right direction of the machine body, and one end of the spring 49 is attached to the standing part 43c provided on the upper surface.

The locking member 45 is a flat plate member on which a pin connection portion 51, a shaft portion 53, and a claw portion 55 are formed, and three of them are arranged in the left-right direction. The pin connection portion 51 has an opening formed at a position corresponding to the first support portion 43a of the base plate 43, and the support pin 48 is fitted or welded into the opening. The shaft portion 53 is formed in a columnar shape extending downward from the pin connection portion 51. The claw portion 55 is a protrusion formed to protrude forward from the lower end of the shaft portion 53. The claw portion 55 has a flat surface (holding surface) 55a formed at the lower end and a curved surface (inclined surface) 55b formed at the upper end.

The biasing members 46 are flat plate members extending upward from the support pins 48, and two are arranged so as to be sandwiched between three locking members 45 lined up in the left-right direction. A biasing hole 46a that opens in the left-right direction is formed in the upper end of the biasing members 46. The reinforcing member 47 is a rod-shaped member that is located at the base of the shaft portion 53 and the claw portion 55 and extends in the left-right direction. The reinforcing member 47 is fitted or welded to the base of the shaft portion 53 and the claw portion 55 of the three locking members 45 lined up in the left-right direction.

The support pin 48 is a pin that is rotatably inserted into the first support portion 43a of the base plate 43. The support pin 48 has a locking member 45 and a biasing member 46 fitted or welded to the inside of the first support portion 43a in the left-right direction, and caps 48a are fixed to both left and right ends. One end of the spring 49 is attached to the erected portion 43c provided on the upper surface of the second support portion 43b of the base plate 43, and the other end is attached to the biasing hole 46a of the biasing member 46.

The lock unit 41 can therefore rotate the locking member 45 around the support pin 48 provided on the base plate 43. In addition, the lock unit 41 can urge the claw portion 55 of the locking member 45 forward by providing a spring 49 on the biasing member 46. Furthermore, the lock unit 41 can also urge the three locking members 45 forward by providing a reinforcing member 47, thereby increasing their strength.

Here, a first fixing hole (first fixing portion) 61 and a second fixing hole (second fixing portion) 62 are formed in the fixing plate 12b. The first fixing hole 61 is an attachment hole that can fix the lock unit 41 to the fixing plate 12b by screwing a bolt (fastening member) 65 into the base plate 43 of the lock unit 41. Two of these first fixing holes 61 are formed side by side in the vertical direction. The second fixing hole 62 is an attachment hole that can fix the lock unit 41 to the fixing plate 12b by screwing a bolt 65 into the base plate 43 of the lock unit 41. Two of these second fixing holes 62 are formed behind the first fixing hole 61 side by side in the vertical direction.

Referring to FIG. 5, a side view of the lock unit 41 and its surroundings when the lock unit 41 is located in the first position is shown. Also, referencing FIG. 6, a side view of the lock unit 41 and its surroundings when the lock unit 41 is located in the second position is shown. Furthermore, referencing FIG. 7 and FIG. 8, explanatory diagrams are shown that explain the operation mode of the lock unit 41 when the lock unit 41 is located in the first position. Below, the relationship between the positions where the first fixing hole 61 and the second fixing hole 62 are formed and the first and second positions, as well as the action and effect of the lock unit 41 in each position will be explained in detail.

As shown in FIG. 5, when the lock unit 41 is in the first position, the claw portion 55 of the locking member 45 is in a position where it can be locked to the locked member 39 of the first shaft portion 35. In other words, the first fixing hole 61 is formed in a position on the fixing plate 12b where the lock unit 41 can be fixed to the first position.

On the other hand, as shown in FIG. 6, when the lock unit 41 is in the second position, the claw portion 55 of the locking member 45 is in a position that does not contact the locked member 39 of the first shaft portion 35. In other words, the second fixing hole 62 is formed in a position on the fixing plate 12b that allows the lock unit 41 to be fixed in the second position.

By forming the first fixing hole 61 and the second fixing hole 62 in such a position, the lock unit 41 can be fixed to the first fixing hole 61 in the fixing plate 12b to lock the claw portion 55 of the locking member 45 to the locked member 39 of the first shaft portion 35, and can be fixed to the second fixing hole 62 to prevent the claw portion 55 from being locked to the locked member 39. Therefore, the fixing plate 12b can fix the lock unit 41 regardless of whether the claw portion 55 of the locking member 45 is locked to the locked member 39 of the first shaft portion 35, thereby preventing the lock unit 41 from being lost.

As shown in FIG. 7, when the lock unit 41 is in the first position, the claw portion 55 of the locking member 45 is locked by being positioned below the locked member 39 on the first support leg 31 or between adjacent locked members 39 (locked state). At this time, the biasing member 46 can bias the claw portion 55 forward by the spring 49, so that the claw portion 55 can be held below the locked member 39 or between adjacent locked members 39.

Furthermore, the flat surface 55a formed on the underside of the claw portion 55 is positioned so as to be approximately perpendicular to the direction in which the locked member 39 rotates when the claw portion 55 is positioned below the locked member 39 on the first support leg 31 or between adjacent locked members 39. As a result, when the lower link 23 rotates about the first shaft portion 35 so as to lower the second support leg 32 due to the load of the cab 7, for example, the claw portion 55 holds the locked member 39 on the flat surface 55a, preventing the locked member 39 from moving upward.

On the other hand, according to FIG. 8, when the claw portion 55 of the locking member 45 is pressed downward by the locked member 39, the claw portion 55 moves rearward from the locked member 39 and releases the locked state of the locked member 39, even when the lock unit 41 is in the first position. Here, a case where the claw portion 55 of the locking member 45 is pressed downward by the locked member 39 is, for example, when the cab 7 is raised by the lift cylinder 17.

In such a case, the lower link 23 rotates about the first shaft portion 35 so as to raise the second support leg 32, and the locked member 39 moves downward. On the other hand, when the curved surface 55b formed on the upper surface of the claw portion 55 abuts against the locked member 39, the angle formed by the direction in which the locked member 39 rotates and the curved surface 55b is less than 90° (predetermined angle θ). In other words, the portion where the locked member 39 abuts against the curved surface 55b forms a specified angle with respect to the plane 55a, which is 90° minus a predetermined angle.

As a result, when the locked member 39 moves downward, the claw portion 55 can be pressed backward by the force of the radial component as viewed from the first shaft portion 35 in the movement direction of the locked member 39. Therefore, the locked member 39 can release the locked state with the claw portion 55 by rotating the locking member 45 about the support pin 48 as an axis, so that the lower link 23 can rotate about the first shaft portion 35 so as to raise the second support leg 32, which in turn allows the cab 7 to be raised.

As a result, when the lock unit 41 is located in the first position, it is possible to prevent the cab 7 from descending while allowing the cab 7 to be raised. Therefore, by fixing the lock unit 41 in the first position, a mechanic performing maintenance on the underside of the cab 7 can work while preventing the cab 7 from descending, and can easily raise the cab 7 without operating the lock unit 41.

As described above, the working machine according to the present invention is provided with a lower running body 3 that runs the machine body 1, an upper rotating body 5 rotatably mounted on the lower running body 3, a cab 7 in which an operation room for operating the machine body 1 is provided, a lifting device 9 that raises and lowers the cab 7, and a locking unit 41 that restricts the cab 7 from being lowered by the lifting device 9, the lifting device 9 having a lower link 23 having a first shaft portion 35 at one end disposed in the tower 11 of the upper rotating body 5 and a second shaft portion 37 at the other end that rotatably supports the cab 7, a second rotating shaft 11b formed on the tower 11 of the upper rotating body 5 and rotatably supporting the first shaft portion 35 of the lower link 23, and a plurality of engaged members 39 formed on the first shaft portion 35 of the lower link 23 and aligned along a trajectory when the lower link 23 rotates around the second rotating shaft 11b.
In addition, the lock unit 41 has a locking member 45 including a claw portion 55 that can be locked to the locked member 39, and the claw portion 55 locks to the locked member 39 when the lower link 23 rotates and the cab 7 descends, and allows the locked member 39 to move when the lower link 23 rotates and the cab 7 rises.

The claw portion 55 of the locking member 45 locks onto the locked member 39 when the lower link 23 rotates and the cab 7 descends, and allows the locked member 39 to move when the cab 7 rises, so that the cab 7 can be prevented from descending while allowing the cab 7 to be raised.

The lock unit 41 has a support pin 48 that supports the locking member 45, a base plate 43 that is fixed to the tower 11 of the upper rotating body 5 and rotatably supports the support pin 48, and a spring 49 that presses the claw portion 55 of the locking member 45 toward the locked member 39. The locking member 45 includes a pin connection portion 51 to which the support pin 48 is fixed and a shaft portion 53 that extends from the pin connection portion 51. The claw portion 55 is formed at the end of the shaft portion 53 and extends toward the locked member 39. This allows the lock unit 41 to be constructed with a relatively small number of parts, and improves resistance to deterioration.

The upper rotating body 5 has a back plate 12 located between the lifting device 9 and the locking unit 41. The back plate 12 is formed with an opening 12a through which at least the locking member 45 of the locking unit 41 can pass, and a fixing plate 12b extending from the vicinity of the opening 12a toward the locking unit 41 to fix the locking unit 41. The fixing plate 12b is formed with a first fixing hole 61 that fixes the locking unit 41 to a first position where the claw portion 55 of the locking member 45 can be engaged with the locked member 39, and a second fixing hole 62 that fixes the locking unit 41 to a second position that is spaced apart from the locking unit 41 from the first position. Therefore, the fixing position of the locking unit 41 can be switched between the first fixing hole 61 and the second fixing hole 62 to prevent or allow the cab 7 to descend.

Furthermore, since the first fixing hole 61 and the second fixing hole 62 are mounting holes into which a bolt 65 that can be screwed into the lock unit 41 is inserted, the lock unit 41 can be suitably fixed to the fixing plate 12b while easily switching the fixed position of the lock unit 41.
Furthermore, since a plurality of (three) claws 55 are formed, the fastening performance between the claws 55 and the locked member 39 can be improved.

The claw portion 55 is formed with a flat surface 55a that holds the interlocked member 39 when the cab 7 descends, and a curved surface 55b that abuts against the interlocked member 39 when the cab 7 ascends and includes a surface inclined at a specified angle to the flat surface 55a. Therefore, when the cab 7 descends, the flat surface 55a holds the interlocked member 39, and when the cab 7 ascends, the curved surface 55b abuts against the interlocked member 39 to deflect the interlocked member 39. In other words, the portion where the interlocked member 39 abuts against the curved surface 55b forms a specified angle of 90° minus a specified angle with respect to the flat surface 55a.

Although the description of the title of the invention according to the present invention is completed above, the present invention is not limited to the above-described embodiment, and can be modified within the scope of the gist of the invention.
For example, in this embodiment, the lock unit 41 is configured by the base plate 43, the engaging member 45, the biasing member 46, the reinforcing member 47, the support pin 48, and the spring 49, but the configuration may be changed as appropriate.

In addition, in this embodiment, the spring 49 urges the urging member 46 rearward to press the claw portion 55 of the locking member 45 forward, but the support pin 48 may be urged to rotate by a spring to press the claw portion 55 forward.

In addition, in this embodiment, the locking member 45 and the biasing member 46 are fitted or welded to the inside of the first support portion 43a in the left-right direction, but they may be spline fastened as long as they can support and fix the cab 7.

In addition, in this embodiment, a curved surface 55b is formed on the upper end of the claw portion 55, but a surface that is inclined at a predetermined angle to the flat surface 55a may be formed, as long as the angle between the direction in which the locked member 39 rotates and the abutting portion when it abuts against the locked member 39 is less than 90°.

REFERENCE SIGNS LIST 1 Machine body 3 Lower travel unit 5 Upper rotating unit 7 Cab 9 Lifting device 11b Second rotating shaft (shaft support member)
12 Back plate (flat plate member)
12a Opening 12b Fixing plate 23 Lower link (support member)
35 First shaft part (one end)
37 Second shaft portion (other end)
39: Locked member 41: Lock unit (restriction device)
43 Base plate (support)
45 Locking member 48 Support pin (pin)
49 Spring (pressure member)
51 Pin connection portion 53 Shaft portion 55 Claw portion 55a Flat surface (holding surface)
55b Curved surface (slanted surface)
61 First fixing hole (first fixing part)
62 Second fixing hole (second fixing part)
65 Bolt (fastening member)

Claims (5)

A lower running body that runs the aircraft;
An upper rotating body rotatably mounted on the lower traveling body;
A cab in which an operation room for operating the aircraft is provided;
A lifting device for lifting and lowering the cab;
a limiting device that limits the lowering of the cab by the lifting device,
The lifting device is
a support member having one end disposed on the upper rotating body and the other end rotatably supporting the cab;
A pivot member formed on the upper rotating body and pivotally supporting one end of the support member;
a plurality of engagement members formed at one end of the support member and arranged along a path of rotation of the support member around the pivot member;
The limiting device is
a locking member including a claw portion that can be locked to the locked member;
the claw portion engages with the locked member when the support member rotates and the cab descends, and allows the locked member to move when the support member rotates and the cab ascends ,
The upper rotating body has a flat plate member located between the lifting device and the limiting device,
The flat plate member has:
an opening through which at least the locking member of the limiting device can pass;
a fixing plate extending from the vicinity of the opening toward the limiting device and fixing the limiting device;
The fixing plate has:
a first fixing portion that fixes the limiting device to a first position where the claw portion of the engaging member can be engaged with the engaged member;
A second fixing portion is formed to fix the limiting device to a second position that is a position spaced apart from the limiting device relative to the first position.
A working machine characterized by: A lower running body that runs the aircraft;
An upper rotating body rotatably mounted on the lower traveling body;
A cab in which an operation room for operating the aircraft is provided;
A lifting device for lifting and lowering the cab;
a limiting device that limits the lowering of the cab by the lifting device,
The lifting device is
a support member having one end disposed on the upper rotating body and the other end rotatably supporting the cab;
A pivot member formed on the upper rotating body and pivotally supporting one end of the support member;
a plurality of engagement members formed at one end of the support member and arranged along a path of rotation of the support member around the pivot member;
The limiting device is
a plurality of locking members each including one claw portion that can be locked to the locked member;
The claw portion is made up of a plurality of claws corresponding to the plurality of locking members, and locks onto the locked member when the support member rotates and the cab lowers, and allows the locked member to move when the support member rotates and the cab rises. The limiting device is
A pin supporting the locking member;
A support body fixed to the upper rotating body and rotatably supporting the pin;
a pressing member that presses the claw portion of the locking member toward the locked member,
The locking member is
a pin coupling portion to which the pin is fixed;
a shaft portion extending from the pin coupling portion,
The claw portion is formed at an end of the shaft portion and extends toward the locked member.
A working machine according to claim 1 or 2 , characterized in that The first fixing portion and the second fixing portion are mounting holes into which fastening members that can be screwed into the limiting device are inserted.
A work machine according to claim 1 , characterized in that The claw portion has
a holding surface that holds the engaged member when the cab is lowered;
and an inclined surface that contacts the locked member when the cab is raised and includes a surface that is inclined at a specified angle with respect to the holding surface.
A working machine according to claim 1 or 2 , characterized in that

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