JP4982236B2 - Rotating support structure of movable step for vehicle - Google Patents

Description

  The present invention relates to a turning support structure for a movable step for a vehicle.

  In general, in large vehicles such as trucks, the front bumper at the lower front of the cab is used as a step when cleaning the front wind etc. from the outside of the cab in the cab. As a result, the space was narrow and unstable, making it difficult to work.

  For this reason, conventionally, a step for spreading the scaffolding is integrally attached to the upper surface of the front bumper (see, for example, Patent Document 1), or a running wind intake is formed on the front surface of the front bumper, and the intake is opened and closed. In use, there is a step provided with a step that can be developed substantially horizontally in front of the front bumper, and a louver is formed on the step to guide the traveling wind to the radiator (for example, see Patent Document 2).

Incidentally, the one described in Patent Document 2 is provided with a bracket provided on the front end surface of the chassis frame, the step is attached to the bracket via a pin (horizontal axis), and is used in a position where it is deployed almost horizontally forward of the bumper surface. It is possible to rotate between the storage position that functions as the louver of the mounting opening, and is formed by two flexible links between the chassis frame and the step in order to support the load of the step The two links extend in a straight line and suspend the step in a use state in which the stay is interposed and the step is expanded substantially horizontally.
JP-A-8-156716 JP 10-147194 A

  However, in the step described in Patent Document 1, the portion on which the foot is placed is narrow and not much different from the depth of the front bumper, so it cannot be said that the operation is easy. However, it is not clearly specified what kind of brackets are attached and how the steps are locked in the storage position, and the structure can support the rotation of the steps stably and reliably. Development was needed.

  SUMMARY OF THE INVENTION In view of such circumstances, the present invention aims to provide a rotating support part structure for a movable step for a vehicle that can improve the front window cleaning workability in a large vehicle and can stably and reliably rotate and support a step. To do.

The present invention is a rotating support part structure for a movable step for a vehicle in which a step is rotatably disposed above a front bumper at the lower part of a cab between a retracted position and a deployed position protruding forward. And
A base portion disposed on a cross member provided so as to span the front end portion of the chassis frame, and a base portion that is suspended from the front end of the base portion and fixed to the front surface of the cross member, and is arranged at a predetermined interval in the vehicle width direction. A front lower mounting portion, a rear upper mounting portion that rises upward from the rear end of the base portion and is fixed to the front surface of the mounting bracket integrated with the cross member, and a front lower mounting portion and a rear upper side from the base portion. A base bracket for rotatably supporting the left and right ends of the vehicle in the vehicle width direction from the standing wall portion rising so as to extend in a direction orthogonal to the mounting portion,
A hinge pin hole and a circular arc-shaped hole centered on the hinge pin hole are formed in the standing wall portion of each base bracket, and the hinge pin is inserted and fixed to the standing wall portion so as to extend in the vehicle width direction. The step support arm is pivotally attached to the step support arm, and a stopper pin projecting from the step support arm is slidably fitted into the arc-shaped elongated hole, so that the rotation range of the step support arm can be reduced. Corresponding to the storage position and the deployment position, and attached so as to span the step between the step support arms ,
The standing wall portion is positioned between front lower mounting portions disposed at a required interval in the vehicle width direction, and the rear end of the standing wall portion is in contact with the rear upper mounting portion. This relates to the rotation support part structure of the vehicle movable step.

  According to the above means, the following operation can be obtained.

  When configured as described above, the step is supported in a stable and reliable manner via the step support arm with respect to the vertical wall portion of the base bracket fixed to the cross member at the front end of the chassis frame, and the step is stored during actual use. When the step support arm and the step are rotated forward from the state of being stored in the position, the stopper pin slides along the arc-shaped elongated hole of the standing wall portion, and further at one end of the arc-shaped elongated hole. Since the rotation is restricted, the step support arm and the step can be held in the unfolded position, the step for placing the foot projects forward from the front bumper, and the operator can easily place the foot on the step. This makes it easier to clean the front window.

Here, the front lower mounting portion is disposed at a required interval in the vehicle width direction, and the rear upper mounting portion is spaced from the front lower mounting portion in the vehicle longitudinal direction and the vertical direction. Since it is arranged, it is advantageous for the moment acting when the operator gets on the step, and it also helps to improve the mounting strength. Further, in the rotating support part structure of the movable step for the vehicle, the standing wall part is located between the front lower mounting parts arranged at a required interval in the vehicle width direction and the rear end of the standing wall part Is configured to abut against the rear upper mounting portion, which is advantageous in further improving the strength of the rotation support portion of the step.

  In the rotating support structure of the movable step for a vehicle, a lock lever capable of locking and unlocking the step support arm at the step storage position can be pivotally attached to the standing wall portion of the one base bracket. Then, from the state where the step is stored in the storage position, the lock state of the step support arm by the lock lever is released, the step support arm and the step are rotated forward of the vehicle, and the front window is cleaned. On the other hand, when the step is lifted after the cleaning operation of the front window is finished, the stopper pin slides along the arc-shaped slot so as to reverse the locus, and the arc-shaped slot Further rotation at the other end of the step is restricted, and the step support arm of the lock lever is Click is made, is held in a state in which the steps housed again in the storage position.

  Furthermore, in the rotation support part structure of the movable step for a vehicle, it is possible to prevent the step support arm from rotating from the retracted position to the deployed position side by inserting a lock pin protruding from the step support arm. A lock hook portion biased by a torsion spring, and a handle portion for rotating the lock hook portion against a biasing force of the torsion spring in a lock releasing direction. A lever can be constructed.

  According to the rotation support part structure of the movable step for a vehicle of the present invention, it is possible to improve the front window cleaning workability in a large vehicle, and it is possible to achieve an excellent effect that the step can be stably and reliably rotated. .

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIGS. 1-10 is an example of the form which implements this invention, Comprising: The front bumper 2 of the front lower part of the cab 1 (refer FIG.9 and FIG.10) WHEREIN: Step 3 is stored position and the unfolding position which protrudes ahead The base brackets 4 that rotatably support the left and right ends in the vehicle width direction of the step 3 are respectively provided so as to hang over the front end of the chassis frame 5. A base portion 4a disposed on the cross member 6 and a front lower mounting portion disposed at a predetermined interval in the vehicle width direction so as to hang from the front end of the base portion 4a and contact the front surface of the cross member 6 4b, 4c, a rear upper mounting portion 4d arranged so as to rise upward from the rear end of the base portion 4a and abut on the front surface of the mounting bracket 7 integral with the cross member 6, and a front lower mounting portion from the base portion 4a. Part b and 4c and a rear wall portion 4e that rises in a direction perpendicular to the rear upper mounting portion 4d, and the front lower mounting portions 4b and 4c from the vehicle front side by a fastening member 8 such as a bolt extending in the vehicle front-rear direction. And the rear upper mounting portion 4 d are fixed to the cross member 6 and the mounting bracket 7.

  In the case of the illustrated example, the base bracket 4 is formed by bending two metal plates 4A and 4B into respective required shapes and welding them together, and one metal plate 4A is formed by the base portion 4a. A front lower attachment portion 4b in which a fastening hole 4b 'of the fastening member 8 is formed, and a standing wall portion 4e that rises from the base portion 4a so as to extend in a direction orthogonal to the front lower attachment portion 4b. A hinge pin hole 9 is drilled in the lower part of the front end side of the standing wall 4e, and a circular arc-shaped hole 10 centering on the hinge pin hole 9 is drilled in the center of the standing wall 4e. The other metal plate 4B includes a remaining portion of the base portion 4a, a front lower attachment portion 4c in which a fastening hole 4c 'of the fastening member 8 is formed, and a fastening hole 4d' of the fastening member 8. And a rear upper mounting portion 4d, and the standing wall portion 4e. Before are assembled so that the rear end position to and upstanding wall portion 4e between the lower side mounting portion 4b and the front lower side mounting portion 4c comes into contact with the rear upper mounting portion 4d. When the contact portion is integrated by welding, the strength is increased. Further, at the end of the rear upper mounting portion 4d, when the base bracket 4 is mounted on the cross member 6, the base bracket is locked to the projecting piece portion 7a of the mounting bracket 7 (see FIGS. 1 and 6). A temporary hook portion 4f that can prevent the four cross members 6 from falling off is formed. 2 shows the base bracket 4 arranged on the right side of the vehicle, and FIG. 3 shows the base bracket 4 arranged on the left side of the vehicle, which are symmetrical to each other. However, a lock lever support pin hole 11 for attaching a lock lever 16 to be described later is formed in the lower part of the rear end side of the upright wall portion 4e of the base bracket 4 arranged on the right side of the vehicle. The base bracket 4 does not necessarily need to use two metal plates 4A and 4B in a combination as shown in FIGS. 2 and 3, for example, the base portion 4a and the front lower attachment portions 4b and 4c. The rear upper mounting portion 4d may be formed of a substantially Z-shaped metal plate, and only the standing wall portion 4e may be welded as a separate member.

  As shown in FIGS. 4, 6, and 7, the step support arm 13 is turned on the standing wall 4 e of the base bracket 4 via a hinge pin 12 that is inserted and fixed in the hinge pin hole 9 so as to extend in the vehicle width direction. A stopper pin 14 that is movably attached and protrudes from the step support arm 13 is slidably fitted into the arc-shaped elongated hole 10, thereby restricting the rotation range of the step support arm 13 and the step. A step main body 3 a using an aluminum extrusion molding material or the like is mounted between the support arms 13. The surface of the step body 3a is covered with a resin cover 3b (see FIG. 9) so that the appearance when step 3 is stored is improved.

  In addition, as shown in FIGS. 4, 6 and 7, a vertical wall 4e of the base bracket 4 arranged on the right side of the base bracket 4 extends to the lock lever support pin hole 11 in the vehicle width direction. A lock lever 16 is rotatably attached via a support pin 15 that is inserted and fixed. The lock lever 16 is attached in a direction to rotate counterclockwise in FIG. 6 by the action of a torsion spring 17 (see FIG. 8). I'm trying to help.

  The lock lever 16 includes a lock hook portion 16a capable of holding a lock pin 18 projecting from the step support arm 13 and preventing the step support arm 13 from rotating from a retracted position to a deployed position, and the base A stopper portion 16b that contacts the base portion 4a of the bracket 4 and restricts rotation of the lock lever 16 in the counterclockwise direction in FIG. 6 by the torsion spring 17, and a lock lever against the urging force of the torsion spring 17 16 is provided with a handle portion 16c for rotating clockwise in FIG. 6, and is drilled at a required location between the lock hook portion 16a and the stopper portion 16b. The support pin 15 is inserted through the bushing 19 into the through hole 16d (see FIG. 8). .

  Further, as shown in FIG. 8, the support pin 15 has a smaller diameter than the pin main body portion 15 a on the proximal end side of the pin main body portion 15 a on which the torsion spring 17 is fitted, and the standing wall portion 4 e of the base bracket 4. A base end screw portion 15b that can be inserted through the lock lever support pin hole 11 formed in the pin body 11 is formed, and has a diameter larger than that of the through hole 16d into which the bush 19 is fitted on the distal end side of the pin main body portion 15a. A flange portion 15c, a shaft portion 15d inserted into the bush 19, and a tip screw portion 15e having a smaller diameter than the shaft portion 15d are formed, and the base end screw portion 15b is inserted into the lock lever support pin hole 11, By tightening the base end nut 20 to the base end thread part 15b, the support pin 15 is cantilevered and supported by the standing wall part 4e of the base bracket 4, and the front end thread part 15 And the shaft portion 15d are inserted into the bush 19, and the lock nut 16 is rotatably attached to the support pin 15 by tightening the tip nut 22 via the washer 21 to the tip screw portion 15e. However, by making the axial direction length L1 of the shaft portion 15d longer than the length L2 of the bushing 19 by a required dimension, even if the tip nut 22 is tightened tightly, there is always a slight gap between the washer 21 and the bushing 19. A gap is formed so that the lock lever 16 can be smoothly rotated.

  The tightening state of the front lower mounting portion 4b of the base bracket 4 with respect to the cross member 6 by the fastening member 8 and the tightening state of the rear upper mounting portion 4d of the base bracket 4 with respect to the mounting bracket 7 are shown in FIG. In addition, as shown in FIG. 6, the front lower mounting portion 4 c of the base bracket 4 protrudes from the front lower mounting portion 4 b toward the vehicle front side of the cross member 6. This is because the center portion projects forward from the front left and right end portions in the vehicle width direction, as shown in FIG. 1, so as to follow this shape.

  Next, the operation of the illustrated example will be described.

  As described above, the base brackets 4 that rotatably support the left and right ends of the vehicle width direction in step 3 are respectively disposed on the cross members 6 provided so as to span the front end of the chassis frame 5. A lower portion 4a, front lower mounting portions 4b and 4c arranged at a predetermined interval in the vehicle width direction so as to hang from the front end of the base portion 4a and contact the front surface of the cross member 6, and the rear end of the base portion 4a A rear upper mounting portion 4d disposed so as to stand up from the front and abut against the front surface of the mounting bracket 7 integral with the cross member 6, and the front lower mounting portions 4b and 4c and the rear upper mounting portion 4d from the base portion 4a; As shown in FIG. 1, the front portion is formed from the front side of the vehicle by a fastening member 8 such as a bolt extending in the vehicle front-rear direction. The side mounting portions 4b, 4c and the rear upper mounting portion 4d can be easily fixed to the cross member 6 with good workability, and a temporary hook is provided at the end of the rear upper mounting portion 4d. Since the part 4f is formed, when the base bracket 4 is attached to the cross member 6, the temporary hook part 4f is locked to the projecting piece part 7a of the mounting bracket 7 (see FIGS. 1 and 6). The base bracket 4 can be prevented from falling off the cross member 6, and the fastening member 8 can be tightened very easily.

  In actual use, as shown in FIGS. 6 and 9A, from the state in which step 3 is stored in the retracted position, the handle 16c of the lock lever 16 is subjected to the urging force by the torsion spring 17 (see FIG. 8). When pulled up against the lock lever 16, the lock lever 16 rotates in the clockwise direction in FIG. 6, the lock pin 18 is removed from the lock hook portion 16 a, the locked state of the step support arm 13 is released, and the step support arm 13 and the step 3 can be rotated forward of the vehicle.

  When the step support arm 13 and the step 3 are rotated forward of the vehicle, the stopper pin 14 is slid along the arc-shaped elongated hole 10 and is prevented from further rotating at the upper end of the arc-shaped elongated hole 10. Then, the step support arm 13 and the step 3 are held at the unfolded position projecting forward as shown in FIGS. 7 and 9B.

  As a result, compared with the step described in Patent Document 1, step 3 for placing a foot projects forward from the front bumper 2 and the operator can easily place the foot on the step 3. Therefore, as shown in FIG. This makes it easier to clean.

  Here, the front lower mounting portions 4b and 4c are disposed at a required interval in the vehicle width direction, and the rear upper mounting portion 4d is arranged in the vehicle front-rear direction and vertically with respect to the front lower mounting portions 4b and 4c. Since it is arranged at a necessary interval in the direction, it is advantageous for the moment that acts when the operator gets on the step 3 (moment that acts counterclockwise in FIG. 6), and improves the mounting strength. Will also be helpful.

  Further, the standing wall portion 4e is positioned between the front lower mounting portion 4b and the front lower mounting portion 4c, and the rear end of the standing wall portion 4e is in contact with the rear upper mounting portion 4d. This is advantageous in improving the strength of the rotation support portion in step 3.

  When the step 3 is lifted from the state shown in FIG. 7 and FIG. 9B after the front window cleaning operation is completed, the stopper pin 14 returns to the above-mentioned locus so that the arc-shaped elongated hole 10 is reversed. 7 and is further restricted from rotating at the lower end of the arc-shaped elongated hole 10, and the lock pin 18 moves the lock lever 16 against the urging force of the torsion spring 17 in the clockwise direction in FIG. It is rotated in the direction and is again held in the lock hook portion 16a, and as shown in FIGS. 6 and 9A, the step 3 is again stored in the storage position.

  In the state where the step 3 is stored in the storage position, the step made of different materials does not always exist on the upper surface of the front bumper as in the step described in Patent Document 1, and the surface of the resin cover 3b can be seen from the outside. Since there is no sense of incongruity alone, there is no worry of deteriorating the appearance, and the design is excellent.

  Thus, the front window cleaning workability in a large vehicle can be improved without impairing the appearance, the step can be stably and reliably rotated, and the attachment workability and the attachment strength can be improved.

  In addition, the rotation support part structure of the movable step for vehicles of this invention is not limited only to the above-mentioned illustration example, Of course, it can add various changes within the range which does not deviate from the summary of this invention. .

It is a disassembled perspective view which shows an example of the form which implements this invention. It is a perspective view showing a base bracket on the right side of a vehicle in an example of an embodiment for carrying out the present invention. It is a perspective view which shows the base bracket of the vehicle left side in an example of embodiment which implements this invention. It is a front view which shows the base bracket on the right side of the vehicle in an example which implements this invention, and the component assembled to it. It is VV sectional drawing of FIG. FIG. 5 is a side view showing a base bracket on the right side of the vehicle and components assembled thereto in an example of an embodiment of the present invention, and is a side view showing a state in which a step is held in a storage position, and a VI-VI arrow in FIG. FIG. It is a side view showing the base bracket on the right side of the vehicle and the components assembled to it in an example of an embodiment of the present invention, and is a side view showing a state where the step is held at the unfolded position. It is an expanded sectional view which shows the attachment part with respect to the base bracket of the lock lever in an example of embodiment which implements this invention, Comprising: It is a VIII-VIII arrow equivalent view of FIG. It is a figure which shows the expansion | deployment procedure of the step in an example which implements this invention, Comprising: (a) is a figure which shows operation which pulls up a lock lever, (b) is a figure which shows the state by which the step was expand | deployed. It is a front view which shows the state in which the person got on the step in an example of embodiment which implements this invention.

Explanation of symbols

1 Cab 2 Front bumper 3 Step 4 Base bracket 4A Metal plate 4B Metal plate 4a Base portion 4b Front lower mounting portion 4b 'Tightening hole 4c Front lower mounting portion 4c' Tightening hole 4d Rear upper mounting portion 4d 'Tightening Hole 4e Standing wall portion 4f Temporary hook portion 5 Chassis frame 6 Cross member 7 Mounting bracket 7a Projection portion 8 Fastening member 9 Hinge pin hole 10 Arc-shaped long hole 11 Lock lever support pin hole 12 Hinge pin 13 Step support arm 14 Stopper pin 15 Support Pin 16 Lock lever 16a Lock hook 16b Stopper 16c Handle 16d Through hole 17 Torsion spring 18 Lock pin

Claims (3)

A rotating support part structure for a movable step for a vehicle, in which a step is rotatably disposed between a retracted position and a forwardly extended position above the front bumper at the lower front of the cab,
A base portion disposed on a cross member provided so as to span the front end portion of the chassis frame, and a base portion that is suspended from the front end of the base portion and fixed to the front surface of the cross member, and is arranged at a predetermined interval in the vehicle width direction. A front lower mounting portion, a rear upper mounting portion that rises upward from the rear end of the base portion and is fixed to the front surface of the mounting bracket integrated with the cross member, and a front lower mounting portion and a rear upper side from the base portion. A base bracket for rotatably supporting the left and right ends of the vehicle in the vehicle width direction from the standing wall portion rising so as to extend in a direction orthogonal to the mounting portion,
A hinge pin hole and a circular arc-shaped hole centered on the hinge pin hole are formed in the standing wall portion of each base bracket, and the hinge pin is inserted and fixed to the standing wall portion so as to extend in the vehicle width direction. The step support arm is pivotally attached to the step support arm, and a stopper pin projecting from the step support arm is slidably fitted into the arc-shaped elongated hole, so that the rotation range of the step support arm can be reduced. Corresponding to the storage position and the deployment position, and attached so as to span the step between the step support arms ,
The standing wall portion is positioned between front lower mounting portions disposed at a required interval in the vehicle width direction, and the rear end of the standing wall portion is in contact with the rear upper mounting portion. Rotating support part structure for a movable step for a vehicle.   2. The movable support structure for a movable step for a vehicle according to claim 1, wherein a lock lever capable of locking and unlocking the step support arm to a retracted position of the step is pivotally attached to the standing wall portion of the one base bracket. A lock hook portion urged by a torsion spring so as to prevent the step support arm from rotating from the retracted position to the deployed position by inserting a lock pin protruding from the step support arm; by providing a hooking portion for rotating against the hook portion the urging force of the torsion spring to the lock release direction, the lock lever configuration claims 1 or 2 for a vehicle movable step according times Dynamic support structure.

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