JPH06328979A - Elevating step device for truck of cab-over type - Google Patents

Abstract

PURPOSE:To improve the landing/alighting property for the cab high above the ground by providing a movable step member in a turnable manner between the storing position and the horizontally extended position, and constituting this movable step member in an elevating/lowering manner along a slide post in the vertical direction. CONSTITUTION:In riding a vehicle, when a switch provided in an appropriate position outside a cab is operated, a door opening/closing device is operated to open the door, and at the same time, an operating lever 56 is turned counterclockwise by the specified angle by the contraction of a first actuator 52. Thus, a movable step member 18 is turned from the storing position to the outside of the vehicle body until the member is in the horizontal position through a step shaft 46 and a step bracket. When the occupant steps on this movable step member 18 and operates the switch for elevating/lowering, a second actuator 60 is extended, and a step arm 24 is elevated along a slide post 20 through a wire 42 to be wound around a pulley 62, and the occupant is elevated thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab-over type truck lifting device.

[0002]

2. Description of the Related Art In the case of a large cab-over type truck,
It is not easy for passengers such as drivers to get on and off because the ground clearance of the cab door opening is fairly high, and improvement of getting on and off is an urgent issue, especially for elderly drivers and female drivers who are increasing in recent years. . However, hitherto, an effective device capable of essentially improving the entry / exitability of a large cabover type truck has not been proposed yet.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is an elevator step device which allows passengers of a cab-over truck, particularly an elderly driver or a female driver, to get on and off safely and easily. It is intended to provide.

[0004]

To achieve the above object, the present invention relates to a movable step member which is formed in a fender portion below a door opening of a cab and constitutes a part of the fender at a storage position, and the movable step. A pair of front and rear slide posts that are erected on the inside of the vehicle body adjacent to the member,
One end of each is supported by the slide post so as to be freely displaceable in the vertical direction, and the other end is supported by a pair of step arms rotatably supporting the movable step member, and one end is supported by the step arm. And the other end of which is connected to the movable step member and which selectively drives the movable step member to either the retracted position or the expanded position rotated to the outside of the vehicle body by the operation thereof, and the slide. A second actuator that is disposed in an inner portion of the vehicle body adjacent to the post and that operates when the movable step member is in the extended position to vertically displace the step arm along the slide post. The present invention proposes a cab-over type lifting step device for a truck.

[0005]

According to the present invention, the occupant is normally stored in a position forming a part of the fender, and when the occupant is getting on and off, the occupant is rotated from the storage position to a substantially horizontal position outside the vehicle body and is extended. A movable step member capable of mounting the movable step member, a first actuator for selectively driving the movable step member to either the storage position or the expansion position, and a second actuator for vertically driving the movable step member. Since the and are provided, the occupant can easily and safely get on and off using the movable step member by performing a simple switch operation and operating the first and second actuators.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. First, in the cab perspective view of FIG. 1, reference numeral 10 generally indicates a cab of a large cab-over truck, 12 is a door opening of the cab 10, 14 is a slide type door for opening and closing the door opening 12, and 16 is a door. Cab 1
0 is a fender provided in the lower part.

A movable step member 18, which forms a part of the fender smoothly and continuously with the fender 16 at the storage position shown by the solid line in the figure, is provided in the fender portion below the door opening 12. The movable step member 18 can be rotated and extended to the substantially horizontal position outside the vehicle body as indicated by the one-dot chain line and the two-dot chain line in the figure, and two points can be expanded in the expanded state. It is possible to move up and down between a descending position A shown by a chain line and an ascending position B shown by a chain line.

The detailed structure of the support and drive device for the movable step member 18 is shown in FIGS. A pair of front and rear sliding posts 20 are erected on an inner portion of the vehicle body adjacent to the movable step member 18, that is, a vehicle body component member such as an undercarriage frame or a cab surrounded by the fender 16, and the sliding post 20 is particularly shown in FIG. As well shown in the enlarged cross-sectional view and the enlarged plan view of FIG. 8, a slit 22 extending in the up-down direction is provided on the side surface outside the vehicle body having a substantially rectangular cross-sectional shape.

Inside the sliding post 20,
Ends 24a on the inner side of the vehicle body of a pair of front and rear step arms 24 each having a substantially trapezoidal side surface and extending in the vehicle width direction are inserted through the slit 22. The lower portion of the inner end portion 24a of the step arm 24 is freely movable along the inner surface of the sliding post 20, as shown in the enlarged vertical sectional view of FIG. 6 and the lateral sectional view of FIG. A pair of rollable rollers 26 are supported on a lateral roller shaft 28. On the other hand, the inner end 2
A slider support 30 having a groove-shaped cross section is fixed to the upper portion of 4a by welding or the like. The slider support 30 is vertically attached to the outer end surface of the slider support 30 along the inner surface of the slide post 20 via a holding pin 32. A slider 34 is mounted which can slide in any direction. The slider 34 is preferably made of a metal material having a small friction coefficient, a metal material having a sliding surface provided with anti-friction coating such as Delrin, or a resin material having a small friction coefficient and excellent wear resistance.

The pair of front and rear slide posts 20 are also provided.
Pulley brackets 36 are fixed to the upper end of the
A pulley 40 is attached to the bracket 36 via a pulley shaft 38.
Is rotatably supported. A wire 42 is wound around each of the pulleys 40, and one end 42a of the wire 42 is wound.
Is fixed to a substantially central portion in the vertical direction of the step arm inner end 24a by a locking tool such as a bolt 44.

Further, both ends of a step shaft 46 are rotatably supported by the outer ends 24b of the pair of front and rear step arms 24, and a step bracket 48 is fixed to the step shaft 46 by welding or the like. There is. The movable step member 18 is fixed to the step bracket 48 with bolts, screws, etc. not shown.

An actuator bracket 50 is fixedly attached to one side surface of a step arm 24 attached to one of the slide posts 20 (rear in the illustrated embodiment), which is a hydraulic cylinder device. Cylinder 52a of the first actuator 52
One end of is pivotally supported by a pivot 54.
The free end portion of the piston shaft 52b of the actuator 52 has an operating lever 56 fixed to the step shaft 46.
Are connected to each other by a pivot 58.

A second actuator 60, which is a hydraulic cylinder device and extends in the vehicle width direction adjacent to the other of the pair of slide posts 20, that is, the front slide post 20 in the illustrated embodiment, is a constituent member of the vehicle body. Installed. The actuator 60 has its cylinder 60a fixed to the above-mentioned body component member, and has two pistons at the free end of the piston shaft 60b extending from the cylinder 60a, as well shown in the perspective view of FIG. A pulley 62 is rotatably supported by a pulley shaft 64. Two pulleys 68 rotatably supported by a pulley shaft 66 are provided between the cylinder 60a and the front slide post 20.
Are arranged.

The wire 42 whose one end 42a is locked to the step arm 24 supported by the rear slide post 20 is shown in FIG.
And as best shown in FIG. 5, it is guided to one of the pulleys 68 via two intermediate pulleys 70 and 72, and further passes through one of the pulleys 62 attached to the piston shaft 60b of the second actuator 60. The other end 42b is locked to the cylinder 60a of the actuator. Further, the step arm 2 supported by the front slide post 20.
The wire 42 whose one end 42a is locked to the No. 4 is directly guided from the pulley 40 at the upper end of the slide post to the other of the pulleys 68, and further, the piston shaft 6 of the second actuator.
The other end 42b is locked to the cylinder 60a of the same actuator passing through the other side of the pulley 62 supported by 0b. The other ends 42b of the two wires 42 are not the cylinder 60a of the second actuator 60 as shown, but
It can be locked to an adjacent body component member.

In the above-described structure, during a normal time when the occupant is not getting on and off, the second actuator 60 is in the contracted position shown in FIG. 2, and the step arm 24 and the elevating step member 18 descend to the descending position. The first actuator 52 has a piston shaft 52b shown in FIG.
From the contracted position shown in to the left of the figure,
The operating bar 56 fixed to the step shaft 46 is rotated clockwise from the illustrated position by an angle θ, and the movable step member 18 is connected to the fender 16 via the step bracket 48 fixed to the step shaft 46. It is held in a storage position that connects smoothly with and forms part of the fender.

When an occupant tries to get into the cab 10 from the normal state described above, if a switch, preferably a push button type, provided at an appropriate position outside the cab 10 (including the door 14) is operated, it is not shown. The door opening / closing device operates to open the door 14 and open the door opening. Door 14
After opening to a predetermined open position, operating the above switch again or operating a second switch provided separately, operating pressure oil is supplied to the contraction side pressure chamber of the first actuator 52, The piston shaft 52b is displaced to the contracted position shown in FIG. 4, and the operating lever 56 rotates counterclockwise by the angle θ. For this reason, the movable step member 18 rotates from the storage position shown by the one-dot chain line in the figure to the outside of the vehicle body through the two-dot chain line via the step shaft 46 and the step bracket 48 fixed to the operating lever 56. It is displaced to a substantially horizontal spreading position indicated by.

Thereupon, the movable step member 1 expanded by the occupant.
8 and operating a raising / lowering switch provided in an appropriate position of the cab 10 in the raising direction, working pressure oil is supplied to the extension side pressure chamber of the second actuator 60, and the piston shaft 6
0b extends outside the cylinder 60a. Therefore, the two pulleys 6 mounted on the piston shaft 60b in a skewer shape
2 is displaced from the position shown by the solid line in FIG. 2 to the extended position shown by the one-dot chain line.

By the right movement displacement of the pulley 62 in FIG. 2, the respective inner ends 24a are moved to the front and rear slide posts 20.
Two wires 42 whose one end is locked to the step arm 24 accommodated therein are simultaneously pulled by the same amount in the same direction, and are suspended by the front and rear step arms 24 via the step shaft 46 and the step bracket 48. The movable step member 18 is moved up from the lowered position A in FIG. 1 to the raised position B near the lower end floor surface of the door opening 12 with an occupant. At this time, the step arm 24 for supporting the movable step member 18 carrying an occupant on the slide post 20 is supported on the inner side surface of the slide post by the roller 26 at the lower portion of the inner end 24a thereof, and at the inner surface of the slide post by the slider 34 at the upper portion. Since it is slidably supported on the movable step member 18, the upward movement of the movable step member 18 can be smoothly and easily performed. Therefore, the occupant performs a simple switch operation and the movable step member 18 extended to the lowered position A near the ground surface.
By moving to the cab, it is possible to easily and safely get into the cab 10.

After the occupant gets in the cab 10, when the storage switch provided inside the cab 10 is operated, the door opening / closing device is activated first to close the door 14,
Next, since the working pressure oil is supplied to the contraction side pressure chamber of the second actuator 60 and the piston shaft 60b thereof is displaced to the contracted position shown by the solid line in FIG. 2, contrary to the above, the step arm 20 and the movable step member are reversed. 18 descends due to gravity, and the movable step member 18 is displaced to the descending position A in FIG. After the movable step member 18 reaches the lowered position A,
By operating a limit switch or the like (not shown), operating pressure oil is supplied to the extension side pressure chamber of the first actuator 52, the operating lever 56 is rotated clockwise by an angle θ, and the movable step member 18 is again moved. It is driven to a storage position which forms part of the fender 16.

Next, when an occupant in the cab 10 is about to get off, by operating a getting-off switch provided at a proper position inside the cab, the movable step member 18 is moved to the first position as in the case of getting on the vehicle. It is stretched by the actuator 52 and then raised by the second actuator 60 to the raised position B in FIG. After the occupant in the cab has moved to the movable step member 18, the second actuator 60 lowers the movable step member 18, and subsequently, when the occupant descends to the ground, the first actuator 52 moves the movable step member 18 to the storage position. Rotated fender 1
Forming part of 6.

The extension and contraction operations of the first and second actuators 52 and 60 can be performed by operating a number of switches provided for each operation, or can be moved. It is also possible to automate the series of operations by detecting the retracted or extended position and the lowered or raised position of the step member 18 by a position sensor such as a limit switch, respectively. Also, opening and closing the door 14
As described above, the door opening / closing device can be used, but of course, the door opening / closing device can be changed to be opened / closed manually. However, in either case, the door 1
4 is opened and then the movable step member 18 is expanded and raised, and the door 14 is closed and then the movable step member 18 is lowered so that opening and closing of the door 14 and displacement of the movable step member 18 are related to each other. It is preferable for safety to configure the control circuit. Further, a pressure switch is provided on the tread surface of the movable step member 18 on which the occupant rides, and after the occupant has completely transferred to the movable step member 18, the movable step member 18 moves up (when riding) or descends (when getting off).
And the occupant moves from the movable step member 18 into the cab 10 (at the time of getting on) or gets down to the ground surface (at the time of getting off), and then the movable step member 18 descends or rotates to the storage position. It is desirable to do.

[0022]

As described above, the cab-over type truck lifting / lowering step device according to the present invention includes a movable step member that is formed in a fender portion below a door opening of a cab and forms a part of the fender at a storage position. A pair of front and rear slide posts that are erected on the inside of the vehicle body adjacent to the movable step member, one end of each of which is supported by the slide post so as to be freely displaceable in the vertical direction, and the other end of the movable step. A pair of step arms that rotatably support members, one end of which is supported by the step arm and the other end of which is connected to the movable step member, and the operation of the movable step member causes the movable step member to be in the storage position or outside the vehicle body. A first actuator that selectively drives to one of the extended positions rotated to the inside, and a body inside portion adjacent to the slide post. A second actuator that is provided and that operates when the movable step member is in the extended position to vertically displace the step arm along the slide post. Since the entry / exitability of a high cab-over type truck can be greatly improved, there is an extremely safe and convenient advantage for passengers, especially for elderly drivers and female drivers.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cab of a cab-over type truck according to an embodiment of the present invention.

FIG. 2 is a front view of the entire cab lifting step device shown in FIG. 1 as viewed from the rear of the vehicle body.

FIG. 3 is a plan view of a main part of the device shown in FIG.

FIG. 4 is an enlarged side view of a main part of the apparatus shown in FIG.

5 is a perspective view showing a wire arrangement in the device shown in FIG. 2. FIG.

FIG. 6 is an enlarged vertical cross-sectional view of the slide post and the step arm shown in FIG.

7 is a cross-sectional view taken along the line VII-VII of FIG. 6 and viewed in the direction of the arrow.

FIG. 8 is a plan view of the device shown in FIG.

[Explanation of Codes] 10 ... Cab, 12 ... Door opening, 14 ... Door, 16 ... Fender, 18 ... Movable step member, 20 ... Slide post, 24 ... Step arm, 52 ... First actuator, 60 ... Second actuator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Yoshizawa 10 Okura-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Mitsubishi Motors Engineering Co., Ltd. Tokyo office (72) Inventor Toshifumi Kajita 3-11, Nishihashimoto, Sagamihara-shi, Kanagawa No. 32 Nippon Lift Co., Ltd.

Claims (1)

[Claims] 1. A movable step member which is formed in a fender portion below a door opening of a cab and constitutes a part of the fender at a storage position, and a pair of front and rear members which are erected on a vehicle body inner portion adjacent to the movable step member. Slide post,
One end of each is supported by the slide post so as to be freely displaceable in the vertical direction, and the other end is supported by a pair of step arms rotatably supporting the movable step member, and one end is supported by the step arm. And the other end of which is connected to the movable step member and which selectively drives the movable step member to either the retracted position or the expanded position rotated to the outside of the vehicle body by the operation thereof, and the slide. A second actuator that is disposed in an inner portion of the vehicle body adjacent to the post and that operates when the movable step member is in the extended position to vertically displace the step arm along the slide post. A cab-over type lifting step device for trucks.