JPS6342030Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, it is extremely dangerous to start an engine with the running shaft or PTO shaft rotatable, so
A starting safety switch is attached to the gear shift lever and PTO lever, so that the running shaft and
Since the PTO shaft was prevented from rotating, two starting safety switches were required, and the lead wires became complicated, resulting in high costs.
There were drawbacks such as they obstructed lever operation.

The present invention aims to improve the above-mentioned drawbacks by making it possible to detect whether the gear shift lever and PTO lever of the traveling gear are in the neutral position or off position using a single starting safety switch.
The PTO lever and the gear shift lever are supported by parallel shafts on the same side of the transmission case. A safety switch that opens and closes the engine starting circuit and a contact material that connects and disconnects it are arranged so that they intersect at the non-transmission position, and their rotation loci intersect at the non-transmission position of both levers. is characterized in that both levers are facing each other so as to turn on the safety switch, or are attached to a member that rotates together with them.

The embodiments shown in the drawings will be explained below.
1 is a transmission case of a tractor or other agricultural working machine, and a PTO shaft 3 having a PTO clutch 2
and a sub-transmission shaft 5 having a transmission gear and a transmission sleeve 4 that engages and disengages it, and supports the PTO.
The shifter 6 connected to the clutch 2 and the shifter 7 connected to the transmission sleeve 4 are supported parallel to one side of the transmission case 1. The upper shifter 6 has its boss 6a screwed into the transmission case 1. The lower shifter 7 is rotatably supported in a locked state by the attached plate 8, and the inserted support shaft 9 is fixed with a pin 10. It is rotatably inserted into a cylindrical body 13 that is integral with the case 1.

Then, a tube 15 that is integral with the base of the sub-shift lever 14 is fitted onto the outer end of the lower support shaft 12 and fixed with a pin 16, and a midway portion of the sub-shift lever 14 is connected to the engine starting circuit. A mounting plate 1, on which a safety switch 17 is attached, is integrated with the cylindrical body 13.
8 is screwed onto the transmission case 1 and has spherical holes 19 corresponding to the high speed position H, neutral position N and low speed position L of the sub-shift lever 14,
A ball 22 held via a spring 21 at the tip of a support rod 20 protruding near the base of the auxiliary shift lever 14 is inserted into one of the holes 19 at the position where the shift is operated.
It locks on...

Further, a PTO lever 23 and a contact material 24 are fixed to the outer end of the upper support shaft 9, and
The PTO lever 23 is in the engaged position as shown in Figure 2.
PTO clutch 2 is engaged and engaged by tilting operation between ON and cut position OFF.

At that time, the rotation locus of the contact material 24 and the rotation locus of the safety switch 17 are set so that they intersect at the neutral position N of the sub-shift lever 14 and the off position OFF of the PTO lever 23, as shown in FIG. Therefore, set the shift sleeve 4 to the neutral position using the auxiliary shift lever 14, and set the PTO position using the PTO lever 23.
Only when the clutch 2 is disengaged, the contact material 24 pushes the safety switch 17 to turn it ON, and only in this state can the engine be started.

In addition, in the drawing, 25 and 26 are O-rings, and 27 is a C pin.

As mentioned above, the present invention pivots the PTO lever and the gear shift lever on the same side of the transmission case using parallel support shafts, so that the rotation loci of each lever are close to each other and opposite each other, and are neutral. position or OFF
A safety switch that opens and closes the engine starting circuit and a contact material that comes into contact with and separate from it are arranged so that they intersect at a non-transmission position such as the position of the lever, and their rotation loci intersect at the non-transmission position of both levers. Since both levers are mounted facing each other so that the contact material turns on the safety switch, or on a member that rotates together with them, it is possible to set the gear shift lever in a position other than the neutral position, which is the non-power transmitting position. as well as
Even if you do not start the engine with the PTO lever set to the engaged position where the PTO clutch is in the power transmitting state, the contact material will not come into contact with the single safety switch, so the engine will start even though the safety switch is in the OFF position. It is safe because the engine can only be started when both levers are in the non-transmission position, and there is no need for a special means to detect the non-transmission position of both levers and transmit it to the safety switch. can be obtained easily and inexpensively, and even if this operation is repeated over a long period of time, the transmission means will not be significantly worn or broken.

Also, if the engine does not start even after you start it, if this is due to an incorrect lever position,
If this can be easily detected, distinguished from other causes, and appropriate measures can be taken quickly, and if the levers are arranged in a specified relationship, then By attaching it to both levers outside the transmission case, safety measures can be easily taken.

Furthermore, when any lever is set to a desired position, there is virtually no operational load on the safety switch or the contact material, and even if safety measures are taken, the lever can be operated easily.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Fig. 1 is a sectional view of the machine case and the lever mounting part, Fig. 2 is a side view of the main parts, and Fig. 3 is a side view showing the relationship between the safety switch and the PTO lever. 1...Mission case, 3...Shift sleeve, 2...PTO clutch, 6, 7...Shifter,
9, 12... Support shaft, 14... Sub-shift lever, 17
... Safety switch, 23 ... PTO lever, 24
...Contact material.

Claims (1)

[Scope of utility model registration request] The PTO lever and the gear shift lever are supported by parallel shafts on the same side of the transmission case. A safety switch that opens and closes the engine starting circuit and a contact material that connects and disconnects it are arranged so that they intersect at the non-transmission position, and their rotation loci intersect at the non-transmission position of both levers. turns on the safety switch
An engine starting safety device characterized by having both levers facing each other so as to be attached to a member that rotates together with the levers.