JP5340024B2 - Manually movable rear bumper - Google Patents

Description

  The present invention relates to a manually movable rear bumper capable of switching between a traveling position and a storage position of a rear bumper in a dump truck that tilts a loading platform backward and discharges a load from the rear of the loading platform, for example.

  Conventionally, in a dump truck, when a loading platform, such as earth and sand, is discharged from the rear of the loading platform by tilting the loading platform rearward, the rear bumper may be buried in the discharging soil and the like, and deformation, breakage, or the like may occur. In addition, when the asphalt finisher vehicle is thrown into the asphalt finisher vehicle by a dump truck, if the dump truck is brought close to the asphalt finisher car, the rear bumper becomes a protrusion obstacle, resulting in inconvenience in asphalt injection.

  As means for solving these problems, a running position that protrudes rearward through an attachment member pivotally attached to the rear end of the vehicle body frame of the vehicle, and a storage position stored below the rear end of the vehicle body frame, There is known a manual type rear bumper that fixes a rear bumper that is pivotably mounted back and forth at a traveling position and a retracted position by inserting and removing a lock pin (fixing pin) (for example, Patent Document 1, Patent Document 1). 2).

  In the above-mentioned patent documents 1 and 2, in order to prevent the lock pin (fixing pin) from being lost, the lock pin (fixing pin) and the rear end of the vehicle body frame of the vehicle are connected by a chain or a wire. It is out.

JP 2007-210581 A (Claims, FIGS. 1 to 4) JP 2007-290676 A (Claims, FIG. 2)

  However, all of the devices described in Patent Documents 1 and 2 have a structure in which the rear bumper is locked (fixed) to the travel position and the storage position by inserting and removing the lock pin (fixed pin), so that the locked (fixed) state In this case, it is necessary to devise so that the lock pin (fixing pin) does not fall off. Therefore, in the thing of patent document 1, the safety pin is inserted in the lock pin in a locked state, and the fall of a lock pin is prevented. However, when a safety pin is used, there is a problem that it takes time to insert and remove the safety pin each time the rear bumper is switched between the traveling position and the storage position.

  In addition, since the lock pins (fixing pins) and the rear end of the vehicle body frame of the vehicle are connected to each other by a chain or a wire, the ones described in Patent Documents 1 and 2 are locked due to damage to the chain or the like for some reason. There is a concern that the pin (fixed pin) may be lost.

  The present invention has been made in view of the above circumstances, and provides a manually movable rear bumper in which the rear bumper can be easily switched between the traveling position and the storage position, and the locked state can be reliably performed. Let it be an issue.

  In order to achieve the above object, the invention according to claim 1 is stored in a traveling position projecting rearward through an attachment member pivotally attached to the rear end portion of the vehicle body frame of the vehicle and below the rear end portion of the vehicle body frame. In the manually movable rear bumper, which is mounted so as to be pivotable back and forth at the stored position and has a lock mechanism for holding the travel position and the stored position, the lock mechanism is disposed at the rear end of the vehicle body frame. Insertion shaft portions inserted into the travel position side insertion holes or the storage position side insertion holes respectively provided, the insertion holes provided in the mounting member, and the insertion guide cylinders communicating with the insertion holes, and the insertion shaft portions A lock pin integrally formed at the base end portion with an operation portion extending perpendicularly to the insertion shaft portion via a bent portion, and the insertion shaft portion is the travel position side insertion hole or the storage position side insertion hole; In the locked state inserted and rotated in, Operation unit side of the serial lock pin is formed to be engaged with the mounting member, characterized in that.

  With this configuration, the insertion shaft portion of the lock pin is inserted through the travel position side insertion hole provided in the rear end portion of the vehicle body frame or the storage position side insertion hole and the insertion guide tube provided in the attachment member. By inserting into the hole and rotating the lock pin, the operation part side of the lock pin can be engaged with the mounting member, and the locked state can be maintained.

  According to a second aspect of the present invention, in the manually movable rear bumper according to the first aspect, the insertion guide tube is provided with a slit extending in the axial direction in which a bent portion of the lock pin is slidable, and is connected to the slit. A locking groove is provided for engaging the bent portion when the lock pin is in a locked state.

  With this configuration, the rear bumper can be locked (fixed) to the travel position or the storage position by engaging the bent portion of the lock pin into the locking groove from the slit. When the rear bumper is moved from the travel position to the retracted position or from the retracted position to the travel position, the bent portion of the lock pin is moved from the locking groove into the slit, and then the insertion shaft portion is engaged with the insertion hole. As a result, the rear bumper can be turned to the retracted position side or the traveling position side. Therefore, the rear bumper can be switched and moved between the travel position and the storage position without completely removing the lock pin from the insertion hole.

  According to a third aspect of the present invention, in the manually movable rear bumper according to the first or second aspect, when the lock pin is in a locked state on the mounting member, the lock pin is engaged and held in the locked state. A lock holding portion is further provided, and the lock holding portion is provided at an upright portion of an angle-shaped member protruding from the mounting member, and is a bending locking portion that is detachably engaged with a bending portion of the lock pin. It is formed, It is characterized by the above-mentioned.

  With this configuration, the lock holding portion can prevent the lock pin from moving when the rear bumper is locked (fixed) at the travel position or the storage position.

  According to a fourth aspect of the present invention, in the manually movable rear bumper according to the first aspect, between the insertion guide tube and the lock pin, a spring member that constantly biases the elastic force to the lock position side is interposed between the insertion guide tube and the lock pin. The locking shaft portion is provided inwardly at the distal end of the lock pin operation portion, and the locking shaft portion can penetrate the mounting member when the lock pin is in a locked state. Provided with a first latch receiving portion at the rear end portion of the vehicle body frame that can be engaged with the latch shaft portion that penetrates the through hole, and the lock pin on the mounting member. A second lock receiving portion that can be engaged with the lock shaft portion when in the unlocked state is provided.

  With such a configuration, the insertion shaft portion of the lock pin can be reliably inserted into the travel position side insertion hole or the storage position side insertion hole by the biasing force of the spring member. Also, a locking shaft portion directed inwardly is provided at the tip end portion of the lever of the lock pin, and a first shaft that can be engaged with the locking shaft portion when the lock pin is in the locked state is provided at the rear end portion of the vehicle body frame. By providing the latch receiving portion and providing the mounting member with a second latch receiving portion that can be engaged with the latch shaft when the lock pin is in the unlocked state, the traveling position or the storage position is locked. It is possible to prevent the movement of the lock pin at

  (1) According to the first and second aspects of the invention, the rear bumper can be easily switched between the traveling position and the storage position, and the locked state can be ensured. In addition, since the rear bumper can be switched between the traveling position and the storage position without completely removing the lock pin from the insertion hole, there is no risk of the lock pin being lost.

  (2) According to the invention described in claim 3, since the movement of the lock pin in a state where the rear bumper is locked (fixed) at the travel position or the storage position can be prevented by the lock holding portion, the above (1) In addition to this, it is possible to secure the safety by maintaining the locked state of the travel position or the storage position of the rear bumper.

  (3) According to the invention described in claim 4, the insertion shaft portion of the lock pin can be reliably inserted into the traveling position side insertion hole or the storage position side insertion hole by the biasing force of the spring member. In addition to 1), the locking operation can be made easier and more reliable. Moreover, since the movement of the lock pin in the locked state of the traveling position or the storage position can be prevented, the safety of the rear bumper can be secured by maintaining the locked state of the traveling position or the storage position of the rear bumper. In addition, since the rear bumper can be switched between the traveling position and the storage position without completely removing the lock pin from the insertion hole, there is no risk of the lock pin being lost.

1 is a perspective view showing a first embodiment of a manually movable rear bumper according to the present invention. It is a side view which shows the state of the running position of the manual movable rear bumper of 1st Embodiment. It is a side view which shows the state of the storage position of the manual movable rear bumper of 1st Embodiment. It is a principal part rear view which shows the state of the running position of the manual movable rear bumper of 1st Embodiment. It is a schematic perspective view which shows the procedure which cancels | releases the locked state of the traveling position of the manual movable rear bumper of 1st Embodiment. It is a side view which shows the state of the driving | running | working position and storage position of 2nd Embodiment of the manual movable rear bumper which concerns on this invention. It is a schematic perspective view which shows the locked state and unlocked state of the manual movable rear bumper of 2nd Embodiment. It is sectional drawing which shows the locked state and unlocked state of the manual movable rear bumper of 2nd Embodiment.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated in detail based on an accompanying drawing.

<First Embodiment>
As shown in FIG. 1, a manually movable rear bumper according to the present invention has a pivot shaft 6 on a fixed member 5 fixed to a rear end portion of a vehicle body frame 2 of a vehicle such as a dump truck 1 by a fixing bolt 3 and a nut 4. A rear bumper body 8 is provided on the free end of the left and right mounting member 7 that is pivotally mounted. The mounting member 7 and the rear bumper body 8 are mounted so as to be pivotable back and forth between a travel position projecting rearward of the dump truck 1 and a storage position stored below the rear end of the vehicle body frame 2. The lock mechanism 10 that holds the traveling position and the storage position is provided.

  The lock mechanism 10 includes a travel position side insertion hole 11 or a storage position side insertion hole 12 provided in the rear end of the vehicle body frame, that is, the left and right fixing members 5, an insertion hole 13 provided in the attachment member 7, and the insertion holes. An insertion shaft portion 21 that is inserted into the insertion guide tube 14 that communicates with 13, and an operation portion 23 that extends perpendicularly to the insertion shaft portion 21 via a bent portion 22 at a proximal end portion of the insertion shaft portion 21. In a locked state in which the insertion shaft portion 21 is inserted into the travel position side insertion hole 11 or the storage position side insertion hole 12 and rotated. The operating portion side is formed so as to be engageable with the attachment member 7.

  In this case, the insertion guide tube 14 is provided with a slit 15 extending in the axial direction in which the bent portion 22 of the lock pin 20 is slidable, and when the lock pin 20 is in a locked state connected to the slit 15, Is provided with a locking groove 16 extending in the circumferential direction with which the bent portion 22 is engaged. Thus, by providing the insertion guide cylinder 14 with the slit 15 extending in the axial direction and the locking groove 16 extending in the circumferential direction continuous to the slit 15, as shown in FIGS. 1 and 5A, the lock pin 20 The rear bumper body 8 can be locked (fixed) to the traveling position or the retracted position by engaging the bent portion 22 of the rear end of the rear bumper body 22 into the locking groove 16 from the slit 15. When the rear bumper body 8 is moved from the travel position to the retracted position or from the retracted position to the travel position, as shown in FIGS. 5B and 5C, the bent portion 22 of the lock pin 20 is engaged with the locking groove 16. Then, the rear bumper body 8 can be rotated to the retracted position side or the traveling position side by releasing the engagement between the insertion shaft portion 21 and the insertion hole 13.

  Further, when the lock pin 20 is in the locked state, the mounting member 7 is provided with a lock holding portion 30 that engages with the lock pin 20 and holds the locked state. The lock holding portion 30 is provided on an upright piece 32 (standing portion) of an angle-shaped member 31 protruding from an attachment member 7 pivotally attached to a fixing member 5 fixed to a rear end portion of the vehicle body frame. It is formed by a bent locking portion 33 that is detachably engaged with the bent portion 22 of the lock pin 20. In this case, the angle-shaped member 31 has a wave shape on the distal end side of the upright piece 32 that stands up from one end of the fixed piece 31a fixed to the support member 34 protruding from the outer surface of the mounting member 7 by the fixing bolt 35 and the nut 36. It is formed with the member which has the bending latching | locking part 33, for example, the member made from spring steel.

  As shown in FIGS. 1 and 2, the mounting member 7 has a hanging side 7b that hangs perpendicularly from the end of the horizontal side 7a that becomes horizontal when the rear bumper is in the traveling position. The lower end of the hanging side 7b, the first and second inclined sides 7c and 7d extending obliquely backward from the other end of the horizontal side 7a, and the ends of the inclined sides 7c and 7d are connected to each other. The plate-shaped main body 7f is composed of a vertical side 7e, and the plate-shaped main body 7f is formed in a box shape composed of bent pieces 7g that are bent at right angles from the respective sides of the plate-shaped main body 7f. By thus forming the attachment member 7 in a box shape, the attachment portion of the rear bumper can be given strength.

  Further, the fixing member 5 is provided with a positioning portion 40 for the travel position of the rear bumper. As shown in FIGS. 1 and 2, the positioning portion 40 can absorb an impact on the lower end of a positioning bolt 42 that is threadably adjusted to a horizontal piece 41 a of a fixed angle member 41 fixed to the surface of the fixing member 5. A cushioning rubber member 43 is attached. When the rear bumper is in the travel position, the positioning unit 40 configured as described above is configured so that the shock absorbing rubber member 43 is in contact with the bent piece 7g on the horizontal side 7a at the upper end of the mounting member 7 so that the rear bumper travels. In addition, it is possible to absorb the impact when the rear bumper receives an impact.

  A limit switch LS for detecting insertion of the insertion shaft portion 21 of the lock pin 20 is disposed at a position near the inner side of the travel position side insertion hole 11 at the rear end portion of the vehicle body frame. Only when the limit switch LS detects the insertion of the insertion shaft portion 21, the display means provided in the driver's seat, for example, a display lamp (not shown) is turned off.

  Next, an operation procedure for switching between the rear bumper travel position and the storage position will be described. First, in order to move the rear bumper from the traveling position to the retracted position, as shown in FIG. 5A, the lock pin 20 engaged with the lock holding portion 30 with the operation portion 23 is moved counterclockwise. And the bent portion 22 engaged with the locking groove 16 is moved into the slit 15 (see FIG. 5B). In this state, the lock pin 20 is pulled forward, the insertion shaft portion 21 is pulled out from the travel position side insertion hole 11, and the engagement between the travel position side insertion hole 11 and the insertion shaft portion 21 is released. While supporting the rear bumper body 8, the lock pin 20 on the opposite side is similarly operated to release the locked state.

  Next, after the rear bumper body 8 is rotated to the storage position and the insertion shaft portion 21 of the lock pin 20 is inserted into the insertion hole 12 on the storage position side, the lock pin 20 is rotated to lock the bent portion 22. Engage in the groove 16 to lock. In this state, the operation unit 23 of the lock pin 20 is held by the lock holding unit 30. The lock pin 20 on the opposite side is operated in the same manner, and the bent portion 22 of the lock pin 20 is engaged in the locking groove 16 to be in the locked state.

  In order to move the rear bumper from the retracted position to the traveling position, the rear bumper can be moved to the traveling position by performing an operation opposite to the above operation. The locked state of the rear bumper that has been moved to the travel position is confirmed by a display means, for example, a display lamp, provided in the driver's seat by a signal from the limit switch LS.

Second Embodiment
FIG. 6 is a side view showing the state of the travel position and the retracted position of the second embodiment of the manually movable rear bumper according to the present invention, and FIG. 7 shows the locked state and lock of the manually movable rear bumper of the second embodiment. FIG. 8 is a schematic perspective view showing the released state, and FIG. 8 is a cross-sectional view showing the locked state and the unlocked state of the manually movable rear bumper of the second embodiment.

  The second embodiment is a case where the lock operation of the lock pin 20A of the lock mechanism 10A can be easily and reliably performed. That is, the manually movable rear bumper according to the second embodiment includes a spring member, for example, a compression coil spring 24, that urges the lock pin 20A toward the lock position at all times between the insertion guide tube 14 and the lock pin 20A. This is a case where the locking operation of the lock pin 20A can be easily and reliably performed.

  In this case, the insertion shaft portion 21A of the lock pin 20A includes, as shown in FIG. 8, a large diameter portion 25 having a narrow taper portion 25a at the tip, and a stepped shaft portion 26 connected to the proximal end side of the large diameter portion 25. It is equipped with. Further, the insertion guide cylinder 14A in the second embodiment has a small-diameter opening 14a on the opening end side, and the compression coil spring 24 is compressed between the small-diameter opening 14a and the large-diameter part 25 of the lock pin 20A. By providing (interposing), the insertion shaft portion 21A of the lock pin 20A is constantly pressed to the lock position side by the elastic force (biasing force) of the compression coil spring 24.

  In addition, a locking shaft portion 27 is provided at the distal end portion of the operation portion 23A of the lock pin 20A in the second embodiment from the distal end portion toward the inward side. The locking shaft portion 27 is provided in parallel to the insertion shaft portion 21A.

  When the lock pin 20A is in the locked state, the locking shaft portion 27 is fixed to the rear end portion of the vehicle body frame through the locking through hole 28 provided in the mounting member 7, as shown in FIG. It inserts into the locking hole 29a which is the 1st locking receiving part provided in the fixing member 5, and engages with the locking hole 29a. Thereby, it can prevent that lock pin 20A in a locked state rotates carelessly.

  Further, the attachment member 7 is provided with a latch receiving cylinder 29b which is a second latch receiving portion that can be engaged with the latch shaft portion 27 when the lock pin 20A is in the unlocked state.

  By configuring as described above, for example, when the rear bumper is moved from the traveling position to the retracted position, as shown in FIG. 7A and FIG. 20A is pulled forward against the elastic force (biasing force) of the compression coil spring 24 to release the locked state, and the locking shaft portion 27 is pulled out from the locking hole 29a and the locking through hole 28. Next, when the locking pin 20A is rotated counterclockwise to move the locking shaft portion 27 to the opening of the locking receiving cylinder 29b and the hand is released from the operation portion 23, the elastic force of the compression coil spring 24 ( The locking shaft portion 27 is inserted into the locking receiving cylinder 29b by the urging force) and the rotation of the lock pin 20A is prevented (see FIGS. 7B and 8B). The lock pin 20A on the opposite side is similarly operated to release the locked state. In this state, the rear bumper can be moved (rotated) to the storage position. After the rear bumper is moved (rotated) to the retracted position, the lock pin 20 is moved to the near side against the elastic force (biasing force) of the compression coil spring 24 with the operation portion 23 of the lock pin 20A and locked. After the shaft portion 27 is pulled out from the lock receiving cylinder 29b, the lock pin 20A is rotated in the opposite direction, that is, clockwise, to move the lock shaft portion 27 to a position facing the lock through hole 28. When the hand is released from the operation portion 23, the insertion shaft portion 21A of the lock pin 20A is inserted into the storage position side insertion hole 12 by the elastic force (biasing force) of the compression coil spring 24 to be locked. Along with this, the locking shaft 27 penetrates the locking through hole 28, and the locking hole 29a is a first locking receiving portion provided in the fixing member 5 fixed to the rear end portion of the vehicle body frame. It is inserted into and engaged with the locking hole 29a.

  In the second embodiment, the other structure is the same as that of the first embodiment, so the same parts are denoted by the same reference numerals and description thereof is omitted.

  In the manually movable rear bumper according to the present invention, as shown by phantom lines in FIGS. 2 and 3, the first locking portion 51 projecting from the rear end portion of the vehicle body frame and the upper outer side of the mounting member 7 A tension spring member, for example, a tension coil spring 50, may be stretched on the second locking portion 52 projecting from. By configuring in this way, the tensile force (biasing force) of the tension coil spring 50 acts when the rear bumper is rotated, and the rear bumper can be moved smoothly.

1 Dump truck (vehicle)
2 Car body 5 Fixing member 6 Pivoting shaft 7 Mounting member 8 Rear bumper body 10, 10A Lock mechanism 11 Traveling position side insertion hole 12 Storage position side insertion hole 13 Insertion hole 14, 14A Insertion guide cylinder 15 Slit 16 Locking groove 20, 20A Lock pin 21, 21A Insertion shaft part 22 Bending part 23 Operation part 24 Compression coil spring (spring member)
27 Locking shaft portion 28 Locking through hole 29a Locking hole (first locking receiving portion)
29b Lock receiving tube (second lock receiving portion)
30 Lock holding part 33 Bending locking part

Claims (4)

The vehicle is mounted so as to be pivotable back and forth between a travel position that projects backward through an attachment member pivotally attached to the rear end of the vehicle body frame and a storage position that is stored below the rear end of the vehicle body frame. In the manually movable rear bumper having a lock mechanism that holds the travel position and the storage position,
The lock mechanism includes a travel position side insertion hole or a storage position side insertion hole provided at a rear end portion of the vehicle body frame, an insertion hole provided in the attachment member, and an insertion guide tube communicating with the insertion hole. A lock pin integrally formed with an insertion shaft portion to be inserted and an operation portion extending perpendicularly to the insertion shaft portion via a bent portion at a proximal end portion of the insertion shaft portion; In the locked state inserted into the travel position side insertion hole or the storage position side insertion hole and rotated, the operating portion side of the lock pin is formed to be engageable with the mounting member. Movable rear bumper. The manually movable rear bumper according to claim 1,
The insertion guide tube is provided with a slit extending in the axial direction in which the bent portion of the lock pin is slidable, and a locking groove which is connected to the slit and engages with the bent portion when the lock pin is in a locked state. A manually operated rear bumper that is provided. The manually movable rear bumper according to claim 1 or 2,
When the lock pin is in a locked state, the mounting member is further provided with a lock holding portion that engages with the lock pin and holds the lock state, and the lock holding portion projects from the angle of the mounting member. A manually movable rear bumper, characterized in that it is formed by a bend locking portion that is provided at an upright portion of the member and detachably engages with a bend portion of the lock pin. The manually movable rear bumper according to claim 1,
Between the insertion guide tube and the lock pin, a spring member that constantly biases the lock pin to the lock position side is interposed, and inward toward the tip of the operation portion of the lock pin. A locking shaft portion is provided, and the mounting member is provided with a through hole through which the locking shaft portion can pass when the lock pin is in a locked state, and the through hole is passed through the rear end portion of the vehicle body frame. A first engagement receiving portion that is engageable with the engagement shaft portion, and the attachment member has a second engagement that is engageable with the engagement shaft portion when the lock pin is in an unlocked state. A manually movable rear bumper characterized in that a stopper is provided.

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