JPS5917936Y2 - Safety device for walk-behind work equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a walk-behind working machine, such as a snowplow.

In such walk-behind work machines, when the machine moves backwards, there is a risk that the back of the operator will hit a cliff or the like and be pinched, resulting in injury.

As a means to solve this problem, it may be possible to install a safety clutch lever near the control section and configure the lever to be operated by the operator to disconnect the latch that causes the vehicle to run. If the safety clutch lever, which requires manual operation, is simply installed near the control unit, there is a risk that the operator may not be able to operate the safety clutch lever in an instant, resulting in pinching a part of the human body. Moreover, with such a configuration, there is a risk that the vehicle will move backward again when the lever operation is released, which poses a problem as a safety device.

The purpose of this invention is to solve this problem, and by using a rational configuration of the safety clutch lever, when the driver's back hits a cliff, etc., the safety clutch lever can be used without the driver's intentional switching operation. The aircraft should be able to stop the aircraft by switching the safety clutch lever, and once the aircraft has stopped moving, the stopped state will be automatically maintained to ensure that the risk of personal injury is avoided. The purpose of the present invention is to provide a safety device for walk-behind work machines.

Next, an embodiment of the present invention will be described in detail based on the drawings. It has a pair of traveling devices 1 at the bottom of the fuselage, a snow removal section 2 at the front, a prime mover 3 at the upper part, and at the rear of the machine. In a walk-behind snowplow 5 formed by extending a bundle 4, a C-shaped arm 9 is pivotally connected to the tip of a rotating lever 8 rotatably provided on a horizontal shaft 7 fixed to the bundle 4. An operating lever 10 of a running latch (not shown) is pivotally connected, and the operating lever 10 is constantly pulled and biased by the clutch, and the running clutch lever 11 is directed upward to the rotating lever 8. The pivot point between the rotating lever 8 and the C-shaped arm 9 is
If there is any slight displacement forward or backward around the horizontal axis 7 from the state where it is located on the virtual straight line connecting the pivot point of the C-shaped arm 9 and the operating rod 10 and the horizontal axis 7 (dead center position). Ba(
If it passes the dead center), the tensile force acting on the operating rod 10 causes it to rapidly shift further toward the front side lid or rear side, and after that, no force is actively applied to the traveling clutch lever 11. As long as the latch runs without exceeding the dead center, the unstable switching mechanism 6 irreversibly pulls and biases the latch to either the transmission state or the non-transmission state, so that the latch can be alternately switched. It is.

When the traveling clutch lever 11 is pulled, the non-illustrated traveling latch is brought into a non-transmitting state via the unstable switching mechanism 6.

Reference numeral 12 denotes a safety clutch lever 12 that is related to the unstable switching mechanism 6 and is fixed to the base end of the rotating lever 8, and extends diagonally backward and downward from the middle of the handle 4. The distal end thereof is located behind the rear end of the traveling device 1 and extends long enough to reach nearly a virtual vertical line passing through the grip portion 4a of the handle 4. A grip portion 13 is provided, and by rotating the safety clutch lever 12 itself forward beyond the dead center, the running latch is irreversibly brought into a non-transmission state, and vice versa. By rotating the latch backward beyond the dead center, the moving latch is irreversibly brought into a transmission state.

According to such a configuration, the normal movement of the aircraft is stopped by pushing and pulling the traveling clutch lever 11, but once the lever 11 is switched to its activated state or non-activated state, this lever 11 is actively operated. As long as no external force is applied, each state is reliably maintained, and the progress or stop continues as is.

In particular, when the aircraft is moving forward, simply by squeezing the running clutch lever 11, the aircraft can be stopped as the aircraft moves forward with the same effect as pulling the running clutch lever 11.

When the operator's back hits a cliff or the like when the aircraft is moving backwards, the grip part 13 hits the body and is pushed forward, causing the safety clutch lever 12, which corresponds to the pulling operation of the traveling clutch lever 11, to be moved forward. By operating on
The latch that runs via the unstable switching mechanism 6 is brought into a non-transmitting state, stopping the aircraft from moving, and the unstable switching mechanism 6
This ensures that the latch remains in the closed state when it runs.

In summary, the safety device for the walk-behind work machine according to the present invention has a safety clutch lever 12 that rotates around the horizontal axis 7 on the handle 4 that extends beyond the traveling device 1 toward the rear of the machine body. The safety clutch lever 12 is movably pivoted, and the safety clutch lever 12 is directed diagonally rearward and downward in side view;
Furthermore, the position of the tip portion in the clutch engaged state is rearward of the rear end of the traveling device 1, and extends long enough to reach near the imaginary vertical line passing through the grip portion 4a of the handle 4. The safety clutch lever 12 and the running latch are operated by pushing the safety clutch lever 12 forward to turn the running latch into the OFF state, and conversely by pulling the safety clutch lever 12 to the rear to turn the running latch into the OFF state. either an operating state in which the moving latch is turned into a non-transmitting state by operating the moving latch in the forward or reverse direction beyond one dead center, or a non-transmitting state in which the moving latch is in a transmitting state. The device is characterized by being irreversibly linked and connected via an unstable switching mechanism 6 configured to be able to alternately switch by elastically biasing the If the aircraft unexpectedly hits a cliff or if it becomes difficult to walk backwards due to getting stuck on soft ground, the operator can use the latch to consciously run backwards if the aircraft continues to move backwards. Even if the operator does not operate the safety clutch lever 12, the aircraft will surely stop when the safety clutch lever 12 hits his/her body, and this will prevent the operator from being pushed by the receding aircraft and being pinched between it and the cliff at the back. It is possible to avoid dangers such as being pushed over, and even if the safety clutch lever 12 is separated from the body once the aircraft has stopped, the safety clutch lever 12 is designed to maintain its position. Since the safety clutch lever 12 is elastically biased, its posture is reliably maintained in the switching state, that is, the running latch, which has once been in a non-transmission state, becomes a transmission state again. This makes it possible to reliably avoid a dangerous situation in which the aircraft begins to roll backwards, thereby reliably preventing accidents resulting in injury or death.

[Brief explanation of the drawing]

The drawings show an embodiment of the safety device for a walk-behind working machine according to the present invention, with FIG. 1 being an overall side view when applied to a snowplow, and FIG. 2 being an enlarged side view of the main parts. 1... Traveling device, 4, Song, Bundle, 4a...
Curved grip part, 4... Unstable switching mechanism, 7... Curved horizontal axis, 12... Curved safety clutch lever

Claims (1)

[Scope of utility model registration request] A safety clutch lever 12 is attached to a horizontal shaft 7 on a part of the bundle 4 that extends backward from the traveling device 1 toward the rear side of the aircraft.
The safety clutch lever 12 is oriented diagonally rearward and downward in a side view, and furthermore, the position of the tip portion of the safety clutch lever 12 in the clutch engaged state is lower than the rear end of the traveling device 1. This safety clutch lever is located at the rear and extends long enough to reach near the virtual vertical line passing through the grip portion 4a of the bundle 4.
12 and the running latch, when pushed forward, the running latch is turned off, and when pulled backwards, the running latch is turned on, and one dead center is set. By forward/reverse rotation beyond , the moving latch is alternately biased elastically to either an operating state in which it is in a non-transmitting state or a non-transmitting state in which the moving latch is in a transmitting state. A safety device for a walking type working machine, characterized in that the devices are irreversibly interlocked and connected via an unstable switching mechanism 6 configured to be switchable.