JPH0428830Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a safety device for reversing a powered mobile working machine such as a snow blower.

(b) Conventional technology For example, during snow removal work using a snow blower, if the operator backs up the snow blower without noticing an obstacle such as a rear wall, the operator may be caught between the snow blower and the obstacle, resulting in danger. It is.

Therefore, a safety device has been proposed in which the clutch is disengaged using the operator's actions when a danger occurs. (For example, see Utility Model Publication No. 56-51093).

(c) Problems to be solved by the invention However, in the conventional safety device described above, the clutch lever, which should be switched in relation to the operator's action in the event of a danger, is operated only when the power mobile work machine is moving backwards. The problem was that the operator could not get close to the aircraft, which impairs operability, as it protrudes backwards even when moving forward.

Further, it is necessary to use a considerably strong force to shift the clutch lever by an operator's action when a danger occurs, and it is also necessary to maintain the clutch lever in that state.

The present invention was developed in view of the above-mentioned conventional problems, and its purpose is to ensure operator safety by operating easily and reliably with light operating force, and to improve operability during forward work. An object of the present invention is to provide a safety device for a power mobile work machine that can achieve the following.

(d) Means for Solving the Problems In order to achieve the above object, the present invention has a differential friction continuously variable transmission, in which a high/low speed lever and a forward/reverse lever are arranged side by side, and the forward/reverse lever In a safety device for a power mobile work machine having a means for switching the high/low speed lever to a low speed side in conjunction with a switching operation to the reverse side, a safety guard is provided at a position below the operation of the handle and in front of the operator. The safety guard and the high/low speed lever are connected via a link mechanism, and when the power mobile work machine moves backward, the safety guard protrudes rearward, and when a danger occurs, the operator contacts the safety guard. The present invention is characterized in that the safety guard is rotated and the high/low speed lever is switched to a neutral position via the link mechanism.

(E) Effect According to the present invention, the high/low speed lever is switched to the neutral position by the operator's action when a danger occurs, and the backward movement of the power mobile work machine is stopped, ensuring the safety of the operator. Due to the characteristics of the dynamic friction continuously variable transmission device, the high/low speed lever can be easily and reliably switched to the neutral position with a light operating force.

Further, since the safety guard protrudes rearward only when the vehicle is moving backward, the operator's operability during normal forward work is not hindered by the safety guard, and the operator can work comfortably.

Furthermore, since the safety guard does not surround the operator, the operator does not have workability affected by the safety guard and does not feel bothered by the safety guard. Furthermore, when the work machine falls from a place with a difference in level, the operator can quickly move away from the work machine.

Furthermore, since the safety guard is disposed below the handle, the safety guard does not protrude beyond the machine body when storing the work machine, and the storage space for the work machine can be reduced.

(F) Embodiment An embodiment of the present invention will be described below based on the attached drawings.

Fig. 1 is a side view of a snow blower equipped with a safety device according to the present invention, Fig. 2 is a plan view of the safety device section of the snow blower, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a side view of a snow blower equipped with a safety device according to the present invention. It is an explanatory diagram of the operation of the safety device.

First, the outline of the configuration of the snow blower will be explained based on FIG. 1.A machine body 1 is moved by a crawler traveling device 2, and a casing 3 and an auger 4 are disposed in front of the machine body 1. A shutter 5 is provided upright above the casing 3.

Also, inside the fuselage 1 is an engine 6 which is a driving source.
A traveling transmission 7 having a built-in differential friction continuously variable transmission is provided, and includes an output shaft 8 extending horizontally from the engine 6, an input shaft 9 extending from the traveling transmission 7, and a casing 3. The transmission shaft 10 that penetrates and reaches the central axis of the auger 4 is:
Pulleys 11, 12, drive belt 13 and pulley 1
4, 15, and a drive belt 16, respectively. Furthermore, a blower 1 is installed inside the casing 3.
7 is directly connected and built in the middle of the transmission shaft 10, and a pinion gear 19 that meshes with a wheel gear 18 connected to the center shaft of the auger 4 is connected to the tip of the transmission shaft 10. And aircraft 1
A rod-shaped operating handle 20 extends behind the handle.

By the way, as shown in FIGS. 2 and 3, at the rear upper part of the fuselage 1, there is a high/low speed lever 22 that is rotatably operated in the front and rear directions (in the vertical direction in FIG. A lever 23 is arranged in parallel. These high/low speed lever 22 and forward/backward lever 23
The differential friction continuously variable transmission device in the traveling transmission 7 switches and operates the forward and backward gears, and these are engaged in guide grooves 25 and 26 of the operation panel 24, respectively. . Note that H, L, and N of the guide groove 25 indicate high speed, low speed, and neutral positions, respectively, and F and R of the guide groove 26 indicate forward and reverse positions, respectively. At the intermediate position of the forward/reverse lever 23, as shown in FIG.
A hook 27 is provided horizontally protruding toward the high/low speed lever 22 side.
3 engages with the high/low speed lever 22 in conjunction with the switching operation to the reverse side (R side), and the high/low speed lever 22
When switching to the forward side (F side), the engagement of the hook 27 with the high/low speed lever 22 is released and the high/low speed lever 22 and the forward/backward movement are switched to the low speed side (L side). It can be operated independently of the lever 23.

Further, the lower end of the high/low speed lever 22 is connected to a safety guard 29 via a link mechanism 28, as shown in the fourth figure.
The link mechanism 28 includes a link 31 and an intermediate link 32 that are connected to each other by a pin 30.
The end of the link 32 is connected to the lower end of the high/low speed lever 22 by a pin 33, and the end of the intermediate link 32 is connected to the base end of the safety guard 29. The safety guard 29 has a rectangular frame shape as shown in FIG.
The snow blower is connected to be rotatable in the vertical direction, and is configured to protrude horizontally rearward as shown by the solid line in FIG. 4 when the snow blower moves backward.

Next, the operation of this safety device will be explained based on FIG. 4.

Now, the high/low speed lever 22 is in the H position shown in the figure.
If the forward/reverse lever 23 is in the F position, the snow blower is in a forward motion at high speed. If the forward/reverse lever 23 is switched to the R position from this state, the hook 27 protruding from the forward/reverse lever 23 will be connected to the high/low speed lever 23.
2 and switches the high/low speed lever 22 to the L position, so that the snow remover performs the required snow removal work in a low speed reverse state. Incidentally, when the snow blower moves backward, the safety guard 29 projects horizontally rearward as described above.

If the operator backs up the snow blower without noticing an obstacle such as a rear wall, the safety guard 29 that protrudes horizontally rearward will come into contact with the operator's legs, causing the safety guard 29 to move around the shaft 34 as shown in FIG. The lever rotates in the direction of arrow a (counterclockwise) and moves to the position shown by the broken line, and moves the high/low speed lever 22, which has been in the L position, to the N position (neutral position: infinite deceleration position) via the link mechanism 28. This switches to stop the snow blower from reversing, thereby avoiding the risk of the operator getting caught between the snow blower and an obstacle. In addition, due to the characteristics of the differential friction continuously variable transmission device, the high and low speed lever 2
2. Switching to the deceleration side can be easily and reliably performed with a light operating force.

In the above configuration, since the safety guard 29 projects horizontally rearward only when the snow blower is moving backward, the operator can approach the machine body 1 when the snow blower is moving forward, improving operability during normal forward work. In addition, conventionally, when parking a snow blower on a slope, etc., it was necessary to turn off the safety clutch and then operate the parking lever, but with the safety device according to this embodiment,
Parking becomes possible simply by operating the safety guard 29 and switching the high/low speed lever 22 to the neutral position (N position).

Further, according to the present invention, since the safety guard 29 does not surround the operator during work, the operator does not have workability affected by the safety guard 29 and does not feel bothered. Furthermore, when the work machine falls from a place with a difference in level, the operator can quickly move away from the work machine.

Furthermore, since the safety guard 29 is disposed below the operating handle 20, the safety guard does not protrude beyond the machine body 1 when storing the working machine, and the storage space for the working machine can be reduced.

Although the above description has been given of an example in which the safety device according to the present invention is particularly applied to a snow blower, the present safety device can be applied to any other power-driven mobile working machine.

(g) Effects of the invention As is clear from the above explanation, according to the invention,
Equipped with a differential friction continuously variable transmission device, high and low speed lever 2
means 2 for switching the high/low speed lever 22 to the low speed side in conjunction with the switching operation of the forward/reverse lever 23 to the reverse side;
In a safety device for a power mobile work machine having 7,
A safety guard is disposed below the operation of the handle 20 and in front of the operator, and the safety guard 2
9 and the high/low speed lever 22 are connected via a link mechanism 28, the safety guard 29 protrudes rearward when the power mobile work machine moves backward, and the operator contacts the safety guard 29 in the event of a danger. Since the safety guard 29 is rotated and the high/low speed lever 22 is switched to the neutral position via the link mechanism 28, due to the characteristics of the differential friction continuously variable transmission device, the operator's action when a danger occurs As a result, the high/low speed lever 22 is easily and reliably switched to the neutral position with a light operating force, the backward movement of the power mobile work machine is stopped, and the safety of the operator is ensured.

Further, according to the present invention, since the safety guard 29 protrudes rearward only when the vehicle is moving backward, it is also possible to obtain the effect that the operability of the operator during forward movement is improved.

[Brief explanation of the drawing]

Fig. 1 is a side view of a snow blower equipped with a safety device according to the present invention, Fig. 2 is a plan view of the safety device section of the snow blower, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a side view of a snow blower equipped with a safety device according to the present invention. It is an explanatory diagram of the operation of the safety device. 20... Operation handle, 22... High/low speed lever, 23... Forward/forward lever, 27... Hook, 2
8...link mechanism, 29...safety guard.

Claims (1)

[Scope of utility model registration request] It has a differential friction continuously variable transmission device, in which a high/low speed lever 22 and a forward/reverse lever 23 are arranged in parallel, and the high/low speed lever 22 is set to low speed in conjunction with the switching operation of the forward/reverse lever 23 to the reverse side. This is a safety device for a power mobile working machine having means 27 for switching to the side, in which a safety guard is disposed below the operation of the handle 20 and in front of the operator, and the safety guard 29 and the high-low speed lever 22 are connected to each other. The link mechanism 2
8, the safety guard 29 protrudes rearward when the power mobile work machine moves backward, and when a danger occurs, the safety guard 29 rotates when the operator contacts the safety guard 29, and the link A safety device for a power mobile working machine, characterized in that a high/low speed lever 22 is switched to a neutral position via a mechanism 28.