JPH0524487U - Connecting device for articulated vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure that the trailer is fully connected to the tractor. [Structure] An operating piece 23 of a switch 22 that is turned on when projecting and turned off when retracted is provided so as to project freely from an engaging surface 24 with respect to an outer peripheral surface of a king pin 19 of a jaw 4, and a power source and an indicator lamp are connected. In the middle of the electric circuit, the switch 22 is arranged in series with a key switch that is turned on / off in response to a key operation.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a connecting device for a combined vehicle capable of confirming a connected state of a tractor and a trailer.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, as a connecting device for a connecting vehicle of this type, there has been a connecting device disclosed in Japanese Utility Model Laid-Open No. 58-17204, for example, and FIGS. 5 to 8 are shown in FIGS. As shown in the figure), the saddle 2 is mounted on the upper surface of the pair of left and right brackets 1 fixed to the frame of the tractor so as to be capable of pitching and swinging through a pin (not shown). A pair of left and right jaws 4 is provided in the horizontal direction via a pin 3 so as to be freely opened and closed.

A yoke shaft 5 is slidably arranged in the front-rear direction at the center of the front portion of the saddle 2, and a bifurcated yoke 6 fixed to the rear end of the yoke shaft 5 moves the jaw 4 from the left and right. It is designed to be pinched and locked in the closed position.

Reference numeral 7 is a spring for biasing the yoke shaft 5 rearward to hold the yoke 6 in engagement with the jaw 4, 8 is a cam plate swung by a release lever 9, and 10 is a cam groove 11 of the cam plate 8. It is a yoke pin that engages and holds the yoke shaft 5. When the release lever 9 is pulled out in the arrow direction against the urging force of the spring 12, the cam plate 8 rotates in the same direction and the cam groove 11 and the yoke pin 10 By the sliding guide operation, the yoke shaft 5 can be moved forward against the biasing force of the spring 7 to disengage the yoke 6 from the jaw 4.

Reference numeral 13 denotes a lock plate that allows the cam plate 8 to swing only when the lever 14 is operated. As shown in FIG. 7, the lock plate 13 that swings sideways moves the yoke 13 that has moved forward. 6 is abutted against the return of the lock plate 13, and 15 is a spring for returning the lock plate 13.

On the other hand, at the rear end of the central portion of the saddle 2, a base end of a lock guard 17 is pivotally mounted via a pin 16 so as to be vertically rotatable, and the lock guard 17 is rotated upward by a spring 18. It is urged to move.

When the king pin 19 is held by the jaw 4, the lock guard 17 is held below the jaw 4 by being pushed down by the lower surface of the king pin 19 as shown in FIG. When the kingpin 19 is not clamped, the jaws 4 are prevented from being inadvertently closed by being thrust between the jaws 4 by the urging force of the spring 18 as shown in FIG.

A switch 20 is attached to the lower surface of the tip of the lock guard 17, and a movable end 21 of the switch 20 is protruded from the upper surface of the tip of the lock guard 17 so that the movable end 21 of the switch 20 can be retracted to the lower end surface of the king pin 19. By facing each other, when the movable end portion 21 of the switch 20 does not come into contact with the lower end surface of the kingpin 19 and is not pushed down, an indicator lamp or the like provided in the operator's cab is turned on.

From the state shown in FIGS. 7 and 8, when the tractor is retracted to connect the trailer and the kingpin 19 is inserted between the jaws 4, the lower surface of the kingpin 19 causes the lockguard 17 to move as shown in FIG. When the jaw 4 is pushed down and the tractor is further retracted, the king pin 19 presses the jaw 4, causing the jaw 4 to close and rotate as shown in FIG. 9 is retracted, the lock plate 13 is pivotally returned, and the jaw 4 is locked in the closed position.

Here, when the lower surface of the king pin 19 pushes the lock guard 17 downward of the jaw 4 as shown in FIG. 6, the lower surface of the king pin 19 causes the movable end portion 21 of the switch 20 to retract, The switch 20 is turned off, and the indicator lamp in the driver's cab disappears from the lit state, so that the driver can recognize that the connecting device of the combined vehicle is locked.

[0011]

[Problems to be solved by the device]

 However, in the coupling device for a coupled vehicle as described above, as long as the kingpin 19 rides on the lock guard 17 and pushes down the movable end portion 21 of the switch 20, the switch 20 will operate, and tentatively. Even if the jaw 4 was not locked in the closed position by the yoke 6 because of the insufficient retreat, there was a possibility that it could be judged to be in the locked state.

In view of the above situation, the present invention aims to provide a connecting device for a combined vehicle capable of confirming that the trailer is completely connected to the tractor only when the kingpin is gripped by the jaws.

[0013]

[Means for Solving the Problems]

 The present invention relates to a connecting device for a combination vehicle, which is provided with a pair of left and right jaws which are provided on a tractor so as to be opened and closed in a horizontal direction and which can open and hold a kingpin of a trailer, and a yoke which can lock the jaws in a closed state. A switch operating piece that turns on when it protrudes and that turns off when it retracts is provided so as to protrude from the engagement surface of the jaw with the outer peripheral surface of the king pin, and it also connects the power supply and the indicator lamp and operates in conjunction with key operation. The switch is arranged in the middle of an electric circuit having a key switch for turning on and off.

[0014]

[Action]

 Therefore, With the jaws open When you start the tractor engine to connect the trailer, The key switch turns on, At this time, Since the operating piece of the switch is protruding, The switch is also on, Current flows from the power supply to the indicator lamp, The indicator lamp is lit, When the tractor is retracted from this state and the kingpin is inserted between the jaws, When the jaw 4 receives the pressing action of the kingpin, the jaw 4 is closed and rotated, The yoke is engaged and the jaws are locked in the closed position, The operating piece of the switch comes into contact with the outer surface of the kingpin and sinks, The switch turns off, No current flows from the power supply to the indicator lamp, the indicator lamp goes out, This allows The driver can recognize that the connecting device of the combined vehicle is locked.

[0015]

【Example】

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

1 to 4 show an embodiment of the present invention, in which the same reference numerals as those in FIG. 5 represent the same parts, and the basic structure is the same as that of the conventional one shown in FIG. However, as shown in FIGS. 1 to 3, the actuating piece 23 of the switch 22 that is turned on when protruding and turned off when retracted is provided on the outer peripheral surface of the kingpin 19 of the jaw 4. The switch 22 is provided so as to project from the engaging surface 24 so as to be retractable and retractable, and the switch 22 is provided in the middle of an electric circuit 27 connecting the power source 25 and the indicator lamp 26 as shown in FIG. It is arranged in series with a key switch 28 that turns on and off in conjunction with each other.

In this embodiment, when the tractor engine is started to connect the trailer from the state shown in FIG. 1, the key switch 28 shown in FIG. 4 is turned on, and at this time, the operating piece 23 of the switch 22 is Since it is protruding, the switch 22 is also on, current flows from the power supply 25 to the indicator lamp 26, and the indicator lamp 26 is lit. From this state, the tractor is retracted and the kingpin 19 between the jaws 4 is pulled. 2, the jaw 4 is closed and pivoted as shown in FIG. 2 by the pressing action of the kingpin 19, and the yoke 6 is engaged to lock the jaw 4 in the closed position.

As shown in FIG. 2, when the jaw 4 is locked in the closed position, the operating piece 23 of the switch 22 comes into contact with the outer peripheral surface of the king pin 19 and is recessed, and the switch 22 is turned off.

When the switch 22 is turned off, current does not flow from the power supply 25 to the indicator lamp 26 and the indicator lamp 26 disappears, which allows the driver to recognize that the coupling device of the vehicle combination is locked.

On the other hand, as shown in FIG. 3, even when the jaw 4 is in the closed position, when the kingpin 19 is not gripped, the operating piece 23 of the switch 22 remains protruding and the switch 22 is also turned on. Since it is held as it is, the indicator lamp 26 remains lit and does not disappear, and it can be confirmed that the trailer is not connected to the tractor.

In this way, it is possible to reliably confirm whether or not the trailer is completely connected to the tractor.

The connecting device for the combined vehicle according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

[0023]

[Effect of the device]

 As described above, according to the connecting device for a combination vehicle of the present invention, it is possible to surely confirm whether or not the trailer is completely connected to the tractor.

[Brief description of drawings]

FIG. 1 is a schematic bottom view showing a jaw open state according to an embodiment of the present invention.

FIG. 2 is a schematic bottom view showing a state where a jaw holds a kingpin according to an embodiment of the present invention.

FIG. 3 is a schematic bottom view showing a state in which a jaw is not gripped by a jaw according to an embodiment of the present invention.

FIG. 4 is an electric circuit diagram of an embodiment of the present invention.

FIG. 5 is a bottom view showing a locked state of a conventional example.

FIG. 6 is a side view of an essential part showing a locked state of a conventional example.

FIG. 7 is a bottom view showing an open state of a conventional example.

FIG. 8 is a side view of an essential part showing an open state of a conventional example.

[Explanation of symbols]

 4 jaws 6 yoke 19 kingpin 22 switch 23 actuating piece 24 engaging surface 25 power supply 26 indicator lamp 27 electric circuit 28 key switch

Claims (1)

[Scope of utility model registration request] 1. A connecting device for a combination vehicle comprising a pair of left and right jaws which are provided on a tractor so as to be opened and closed in a horizontal direction so as to open and hold a king pin of a trailer, and a yoke which can lock the jaws in a closed state. A switch operating piece that is turned on when protruding and turned off when retracted is provided so as to project freely from the engaging surface of the jaw with respect to the outer peripheral surface of the king pin, and the power source and indicator lamp are connected and linked with key operation. A connecting device for a combined vehicle, wherein the switch is arranged in the middle of an electric circuit having a key switch for turning on and off.