JPH0544690U - Vehicle step device - Google Patents

Abstract

(57) [Summary] [Structure] Steps 8 and 9 for getting in and out of the passenger compartment 5 and a double-acting fluid pressure cylinder 13 that expands and contracts in conjunction with opening and closing of the doors 6 and 7 of the passenger compartment 5 are provided. The double-acting hydraulic cylinder 13
Steps 8 and 9 swing due to the expansion and contraction of. The door 6,
When the door 7 is opened, the steps 8 and 9 are in a use state in which it projects from the vehicle body 4, and when the doors 6 and 7 are closed, the steps 8 and 9 are steps.
Is stored in the vehicle body 4 and is in an unused state. Step 8,
There is provided a return member that applies an elastic force in the direction of housing 9, and the elastic force is smaller than the force that the double-acting hydraulic cylinder 13 applies to the steps 8 and 9. [Effect] The steps can be stored securely. The step can be prevented from suddenly protruding and colliding with a person, and the step can be quickly stored in the vehicle body. The return member can exert an elastic force for a long period of time and can be replaced independently of the fluid pressure cylinder.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a step device for a vehicle including a step capable of changing its posture between a use state protruding from a vehicle body and a non-use state accommodated in the vehicle body.

[0002]

[Prior Art]

 Vehicles equipped with a step for getting on and off have been conventionally used so that the passengers can easily get in and out of the passenger compartment. However, if the boarding / unloading step protrudes from the vehicle body, it may interfere with an obstacle or enter a narrow road.

Therefore, a step for getting in and out of the passenger compartment and a single-acting hydraulic cylinder that expands and contracts in conjunction with opening and closing of the door of the passenger compartment are provided, and the step corresponds to the usage state protruding from the vehicle body and the vehicle body. It is swingably attached to the vehicle body so that the posture can be changed to the unused state where it is stored, and the step is in use when the door is open and the step is not in use when the door is closed. As described above, a vehicle step device in which the step and the single-acting hydraulic cylinder are connected has been proposed (see Japanese Utility Model Laid-Open No. 59-4348).

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional step device, the single-acting fluid pressure cylinder expands when the high-pressure fluid is supplied to bring the step into the use state, and the elastic force of the spring reduces it to bring the step into the non-use state. ..

However, when the step is housed by the elastic force of the spring, the elastic force of the spring decreases due to long-term use, and the step cannot be completely housed. In that case, not only the panel but also the entire single-acting hydraulic cylinder must be converted, which is troublesome.

Therefore, it is conceivable to use a double-acting fluid pressure cylinder that swings the step. However, if the fluid piping is damaged, the step cannot be stored in the vehicle body, and a person swings the step to store the step. Labor is required.

It is an object of the present invention to provide a vehicle step device that can solve the above technical problems.

[0008]

[Means for Solving the Problems]

 The feature of the present invention is that it has a step for getting on and off the passenger compartment and a double-acting hydraulic cylinder that expands and contracts in conjunction with opening and closing of the door of the passenger compartment. It is swingably attached to the vehicle body so that the posture can be changed to the unused state where it is stored in the vehicle body.When the door is open, the step is in use, and when the door is closed, the step is in use. Therefore, the step and the double-acting fluid pressure cylinder are connected to each other, and the return member is provided to connect the vehicle body and the step and to apply an elastic force in the direction of accommodating the step. The point is that the pressure cylinder is made smaller than the force acting on the step.

[0009]

[Action]

 According to the configuration of the present invention, even if the high-pressure fluid cannot be supplied to the double-acting hydraulic cylinder due to damage to the pipe or the like, the step is housed in the vehicle due to the elastic force exerted by the return member on the step.

Since the elastic force exerted by the return member on the step is smaller than the force exerted by the double-acting fluid pressure cylinder on the step, when the double-acting fluid pressure cylinder normally operates, the elastic force of the return member is increased. The elastic force does not hinder the swing of the step by the double-acting hydraulic cylinder.

Further, in the double-acting hydraulic cylinder, when the step is projected from the vehicle body, it is necessary to swing the step against the elastic force of the return member. Therefore, the speed at which the step projects from the vehicle body is slower than the speed at which the step is stored in the vehicle body. As a result, even when a person stands in front of the step when the step is projected, the step can be prevented from colliding with the person, while the step can be stored quickly.

[0012] Furthermore, since the restoring member does not normally exert the elastic force for accommodating the step, the elastic force can be exerted for a long period of time, and even when the replacement is necessary, the fluid pressure cylinder is not required. No replacement required.

[0013]

【Example】

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

The fire-fighting ladder vehicle 1 shown in FIG. 7 includes a vehicle body 4 supported by front wheels 2 and rear wheels 3, a vehicle compartment 5 that covers the driver's seat at the front of the vehicle body 4, and a rear portion of the vehicle body 4. It has a telescopic ladder 29 attached to it. The passenger compartment 5 has an entrance on the left and right, and the entrance is opened and closed by a front door 6 and a rear door 7.

Steps for getting on and off the passenger compartment 5 are provided. That is, the front step 8 is provided below each front door 6, and the rear step 9 is provided below the rear door 7. Each of the steps 8 and 9 is, as shown in FIGS. 2, 3, and 4, a usage state in which the vehicle body 4 is projected, and a non-use state in which the vehicle body 4 is stored as shown in FIGS. 1, 5, and 7. The posture is changed to. That is, a pair of front and rear brackets 10 and 11 are attached to each of the steps 8 and 9, and a support shaft 12 along the front-rear direction of the vehicle 1 is relatively rotatably inserted through each of the brackets 10 and 11. It is supported by the vehicle body 4. As a result, each of the steps 8 and 9 can be swung about the support shaft 12, and by this swing, the posture is changed between the use state in which the steps are projected from the vehicle body 4 and the non-use state in which the vehicle body 4 is accommodated.

As shown in FIGS. 1 to 3, a double-acting air cylinder 13 for swinging each of the steps 8 and 9 around the support shaft 12 is provided. The cylinder tube of the air cylinder 13 is swingably attached to the vehicle body 4 about a shaft 14 extending in the front-rear direction, and the telescopic rod is attached to the bracket 10 so as to be relatively swingable about a shaft 15 extending in the front-rear direction. .. As a result, when the air cylinder 13 is contracted, the steps 8 and 9 project from the vehicle body 4 as shown in FIG. 2, and steps 8 and 9 can be used to get on and off the floor 5a of the passenger compartment 5. Becomes When the air cylinder 13 is extended, the steps 8 and 9 are stored in the vehicle body 4 as shown in FIG.

Each of the steps 8 and 9 is used when the doors 6 and 7 are opened, and is not used when the doors 6 and 7 are closed. That is, as shown in FIG. 6, an air cylinder 13a for rocking the right front step 8, an air cylinder 13b for rocking the right rear step 9, and an air cylinder for rocking the left front step 8. A cylinder 13c and an air cylinder 13d for rocking the left rear step 9 are connected to the switching valves 16a, 16b, 16c, 16d, respectively. The switching valves 16a, 16b connected to the right air cylinders 13a, 13b are connected to the accumulator 19 via the pressure reducing valve 17a and the filter 18a, and the switching valves 16c connected to the left air cylinders 13c, 13d. , 16d are connected to an accumulator 19 via a pressure reducing valve 17b and an air filter 18b. The accumulator 19 is filled with high-pressure air compressed by a compressor driven by the engine of the vehicle 1.

Each switching valve 16 a, 16 b, 16 c, 16 d is a two-position switching type solenoid valve, and includes a first port A connected to the expansion air chamber of the air cylinder 13 and a reduction of the air cylinder 13. A second port B connected to the air chamber, a third port C connected to the pressure reducing valves 17a and 17b, and a speed controller 20 formed by connecting a variable throttle valve and a check valve in parallel. And a fourth port D. The fourth port D is opened to the atmosphere via a silencer 22 connected to the speed controller 20.

The solenoid 16a ′ of the switching valve 16a connected to the right front step air cylinder 13a is connected to the limit switch 23a that is turned on when the right front door 6 is opened, and the right rear step The solenoid 16b 'of the switching valve 16b connected to the air cylinder 13b for operation is connected to the limit switch 23b which is turned on when the right rear door 7 is opened, and is connected to the air cylinder for front step 13c on the left. The solenoid 16c 'of the valve 16c is connected to the limit switch 23c which is turned on when the left front door 6 is opened, and the solenoid 16d' of the switching valve 16d connected to the left rear step air cylinder 13d is Limit switch that turns on when the left rear door is opened Switch 23d.

As a result, when the doors 6, 7 are opened, the corresponding limit switches 23a, 23b, 23c, 23d are turned on and the corresponding solenoids 16a ', 16b', 16c ', 16d' are energized, and the corresponding solenoids 16a ', 16b', 16c ', 16d' are energized. The switching valves 16a, 16b, 16c, 16d are actuated so as to supply the high-pressure air to the reducing air chambers of the air cylinders 13a, 13b, 13c, 13d, and the corresponding steps 8 and 9 project from the vehicle body 4. It becomes a state. Further, when the doors 6 and 7 are closed, the corresponding limit switches 23a, 23b, 23c and 23d are turned off and the corresponding solenoids 16a ', 16b', 16c 'and 16d' are deenergized and the corresponding switching valves are released. 16a, 16b, 16c, 16d are actuated by the elastic force of springs 16a ", 16b", 16c ", 16d", and extend the air cylinders 13a, 13b, 13c, 13d as shown in FIG. High-pressure air is supplied to the working air chamber, and the corresponding steps 8 and 9 are accommodated in the vehicle body and are not in use.

As shown in FIGS. 3, 4, and 5, a gas damper (returning member) 25 that connects the vehicle body 4 and the steps 8 and 9 and applies an elastic force in the direction in which the steps 8 and 9 are housed is provided. It is provided. The cylinder tube 25a of the gas damper 25 is swingably attached to the vehicle body 4 about a support shaft 26 in the front-rear direction, and the telescopic rod 25b is attached to the brackets 11 attached to the steps 8 and 9 in the front-rear direction. The telescopic rod 25b is attached so as to be swingable about 27, and the telescopic rod 25b is biased in the extension direction by a spring built in the cylinder tube 25a. As a result, the gas damper 25 exerts an elastic force in the direction in which the steps 8 and 9 are stored. The elastic force applied to the steps 8 and 9 by the gas damper 25 is smaller than the force applied to the steps 8 and 9 by the air cylinders 13a, 13b, 13c and 13d.

According to the above configuration, even if high-pressure air cannot be supplied to the air cylinder 13 due to damage to the pipe, the gas damper 25 expands, and the elastic force acts on the steps 8 and 9. , 9 can be stored in the vehicle body 4. Further, since the force which the air cylinder 13 normally operates and acts on the steps 8 and 9 is larger than the elastic force which the gas damper 25 acts on the steps 8 and 9, the gas damper 25 swings in the steps 8 and 9. There is no stopping. Further, since the air cylinder 13 needs to project the steps 8 and 9 from the vehicle body 4 against the elastic force of the gas damper 25, the projecting speed of the steps 8 and 9 becomes slower than the storage speed. As a result, even if a person stands in front of steps 8 and 9, steps 8 and 9 do not suddenly project, so that there is no collision with a person, while steps 8 and 9 are quickly stored. can do. Moreover, since the gas damper 25 applies elastic force to the steps 8 and 9 to restore it only in an emergency, the elastic force can be applied for a long period of time, and even if replacement is required, the air cylinder 13 of the air cylinder 13 can be replaced. No replacement is necessary.

The present invention is not limited to the above embodiment. For example, although the present invention is applied to the ladder vehicle for fire fighting in the above embodiment, the use of the vehicle is not particularly limited. Further, although the air cylinder is used as the double-acting fluid pressure cylinder, a hydraulic cylinder may be used. Further, although the gas damper is used as the returning member, a spring may be used.

[0024]

[Effect of the device]

 According to the step device for a vehicle of the present invention, the step is rocked by the double-acting fluid pressure cylinder, so that the step is stored more reliably than the conventional one in which the step is rocked by the single-acting fluid pressure cylinder. be able to. Even if the step cannot be stored in the cylinder due to damage to the pipe, the elastic force of the return member can store the step. In addition, the step can be prevented from suddenly protruding from the vehicle body and colliding with a person, and can be quickly stored in the vehicle body. Further, since the return member operates the step only in case of emergency, it is possible to apply the elastic force for a long period of time, and at the same time, it can be replaced independently of the fluid pressure cylinder.

[Brief description of drawings]

FIG. 1 is a side view of a step device according to an embodiment of the present invention when not in use.

FIG. 2 is a side view of a stepping device according to an embodiment of the present invention in use.

FIG. 3 is a plan view of an essential part of a step device according to an embodiment of the present invention.

FIG. 4 is a side view of a stepping device according to an embodiment of the present invention in use.

FIG. 5 is a side view of a step device according to an embodiment of the present invention when not in use.

FIG. 6 is a pneumatic circuit diagram of a vehicle step device according to an embodiment of the present invention.

FIG. 7 is a side view of a vehicle according to an embodiment of the present invention.

[Explanation of symbols]

 4 Car body 5 Cabin 6, 7 Doors 8, 9 Steps for getting on and off 13 Double-acting air cylinder 25 Gas damper (returning member)

Claims (1)

[Scope of utility model registration request] 1. A step for getting in and out of a vehicle compartment, and a double-acting hydraulic cylinder that expands and contracts in conjunction with opening and closing of a door of the vehicle compartment, the step being stored in the vehicle body and in a use state protruding from the vehicle body. It is swingably attached to the vehicle body so that the posture can be changed to a non-used state, and when the door is open, the step is in the used state and when the door is closed, the step is in the non-used state. The step and the double-acting fluid pressure cylinder are connected to each other, and a return member that connects the vehicle body and the step and applies an elastic force in a direction in which the step is housed is provided. A step device for a vehicle, which is smaller than the force to be applied.