JPH0534490Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure for attaching a safety cover of a rotary tiller, in which a safety cover covering the upper part of the input shaft of the rotary tiller is swingably opened and closed.

[Conventional technology]

In the rotary tiller, the safety cover has conventionally been closed and locked using screws, which has caused the following inconveniences.

[Problem that the invention attempts to solve]

That is, when opening and closing the safety cover, it is necessary to perform the troublesome operation of switching the screw between the locked state and the released state, which is time-consuming.

The purpose of the present invention is to provide a safety cover that can be opened and closed quickly and has a simple structure.

[Means for solving problems]

The characteristic configuration of the present invention is that a safety cover support member and a safety cover are disposed at an upper position of the input shaft of the rotary tillage device, and the safety cover support member is fixed to a fixed part of the rotary tillage device, In the safety cover mounting structure, the safety cover is attached to the safety cover support member so as to be able to swing open and close in an open position in which the upper side of the input shaft is opened and in a closed position in which the upper side is covered. The swing axis of the safety cover is set along the axis of the input shaft, and the safety cover is moved so that the open position and the closed position of the safety cover are distributed to both sides of the dead point. a curved spring wire that biases the curved spring wire in the opening or closing direction, a first spring attachment portion that holds one end of the curved spring wire toward the safety cover side, and a second spring attachment that holds the other end. The curved spring wire has a straight portion that can be inserted into each of the spring attachment portions from either the front side or the rear side of the body, and a curved portion that connects the shaped portions, and the spacing between the first spring attachment portion and the second spring attachment portion is set such that it becomes larger or smaller toward the downstream side in the spring insertion direction. Its functions and effects are as follows.

[Effect]

In other words, when the safety cover is closed, both free ends of the curved spring wire are once in a parallel position, and then are biased to close, maintaining the safety cover in the closed state. When the safety cover is opened, the curved spring wire Once both free ends of the spring wire are in a parallel position, the closed bias is released, making it possible to maintain the open state of the safety cover.

By simply inserting the curved spring wire into the first spring attachment portion and the second spring attachment portion, the spring wire will be caught on the safety cover and its support member and will not come off due to the difference in the spacing between these attachment portions.

[Effect of idea]

Therefore, simply by opening and closing the safety cover, the spring wire that is the closing fixture switches between the activated state and the released state, and the safety cover can be opened and closed easily and quickly because no operation is required for the closing and securing means. The rotary tiller can now be connected and disconnected efficiently from the opening/closing surface of the safety cover.

In addition, since the safety cover is configured to be able to swing open and close around the axis along the axis of the input shaft, the safety cover can be closed and fixed using a curved spring wire with a simple structure, and this spring Since the wire can be attached by simply inserting it into the first spring attachment part and the second spring attachment part, the structure can be simplified both in terms of the fixture itself and its attachment structure, which is economical. And it was advantageous in terms of production.

〔Example〕

As shown in FIG. 8, a rotary tiller 4 is connected to the rear of the traveling machine via a link mechanism 3 consisting of a top link 1 and a pair of left and right lower links 2, 2, and is driven up and down by a hydraulic cylinder 5. A pair of swingable left and right lift arms 6, 6 and a pair of left and right lower links 2, 2 are connected via a lift rod 7 and a hydraulic cylinder 8, and the rotary tilling device 4 is turned into a traveling machine by the hydraulic cylinders 5 and 8. The power take-off shaft 9 and the rotary tiller 4 are configured to be able to be lifted and lowered or rolled relative to the vehicle, and protrude rearward from the rear of the traveling body.
An input shaft 11 protruding forward from a bevel gear case 10 is movably connected via a transmission shaft 12 provided with a universal joint, thereby forming a riding type cultivator.

As shown in FIG. 4, the lift arms 6, 6
The tip of the piston rod 5a of the hydraulic cylinder 5 is engaged with the concave portion 16a of the operating arm 16, and the pin 17 for preventing detachment at the engaging portion B is recessed relative to the center line of the operating arm 16. It is inserted through the operating arm 16 and the piston rod 5a while being positioned at a position recessed toward the entrance portion 16a.

To explain in detail the connection structure of the top link 1 to the fuselage, as shown in FIGS. 5 and 6, the free end of the top link 1 is connected to the link mounting member 1.
The link mounting member 18 is removably connected to a bracket 19 bolted to the fuselage body by means of a pin 20.
Then, the link mounting member 18 is tightened and fixed to the bracket 19 using screws 21 so that no looseness occurs at the connecting portion between the bracket 19 and the link mounting member 18. The screw jack 21 includes an abutting member 22 whose one end or the other end is inserted into the elongated hole 18a of each of the pair of main members 18A, 18A of the link mounting member 18, and a main member connecting member of the link mounting member 18. It consists of a bolt 24 screwed into a nut 23 attached to 18B.

As shown in FIGS. 2, 3, 7, and 8, a safety cover 13 that covers the upper part of the input shaft 11 of the rotary tiller 4 is supported by a safety cover fixed to the bevel gear case 10. It is attached to the member 14 so as to be able to swing open and close around an axis along the axis of the input shaft 11. Then, when the safety cover 13 is in the closed state, a closing biasing force due to a restoring force acts on the safety cover 13, which pulls the curved spring wire 15, which has straight portions at both ends and a curved portion at the middle, on the safety cover 13 in the closed state. While extending from the bent position as shown in FIG. As shown in Figure 1, the safety cover 13
By operating the safety cover 13 beyond the switching point P to the closing side, the safety cover 13 is automatically switched to a state in which it is biased closed by the tensile restoring force of the curved spring wire 15, and the safety cover 13 is maintained in the closed state. Also, by operating the safety cover 13 beyond the switching point P to the open side, the safety cover 13 is automatically switched to a state in which it is biased open by the tensile restoring force of the curved spring wire 15, and the safety cover 13 is opened. 13 is in the open state shown by the solid line in FIG. 1, the curved spring wire 15 is in a free state where the tensile restoring force of the curved spring wire 15 is eliminated, and the safety cover 13 is maintained in the open state. There is. Therefore, when connecting and uncoupling the rotary tilling device 4, the safety cover 13 can be opened by swinging the safety cover 13 toward the open side, and after the connecting and disconnecting operations, the safety cover 13 can be opened. By swinging the safety cover 15 toward the closing side, the safety cover 13 can be brought into the closed state.

By arranging the first spring attachment part 13a and the second spring attachment part 14a so that the distance A becomes smaller toward the downstream side in the spring insertion direction, as shown in FIG. Both end portions are made difficult to come off from the first spring attachment portion 13a and the second spring attachment portion 14a.

[Another example]

In the embodiment described above, the distance A between the first spring attachment portion 13a and the second spring attachment portion 14a is arranged such that the distance A becomes smaller toward the lower side in the spring insertion direction. Both parts 13a and 14a may be arranged so that they become larger toward the lower side.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the structure of the safety cover attachment part of the rotary tillage device according to the present invention, in which Figure 1 is a front view of the safety cover, Figure 2 is a perspective view of the safety cover attachment part, and Figure 3 is the safety cover. Fig. 4 is a partially cutaway plan view of the hydraulic cylinder insertion part, Fig. 5 is a partially cutaway longitudinal side view of the link mounting member, and Fig. 6 is a partially cutaway side view of the link mounting member. FIG. 7 is a front view of the rotary tiller, and FIG. 8 is a side view of the rear part of the riding tiller. 4... Rotary tillage device, 11... Input shaft, 1
3... Safety cover, 13a... First spring attachment part, 14... Safety cover support member, 14a... Second spring attachment part, 15... Curved spring wire, A...
interval.

Claims (1)

[Claims for Utility Model Registration] A safety cover support member 14 and a safety cover 13 are disposed above the input shaft 11 of the rotary tillage device 4, and the safety cover support member 14 is fixed to the rotary tillage device 4. The safety cover 13 is attached to the safety cover support member 14 so as to be able to swing open and close in an open position in which the upper side of the input shaft 11 is opened and in a closed position in which the upper side is covered. The safety cover mounting part structure has a structure in which the swing axis of the safety cover 13 is connected to the input shaft 1.
1, and biases the safety cover 13 in the opening or closing direction so that the open position and the closed position of the safety cover 13 are distributed to both sides of the dead point. The curved spring wire 15 is provided, and a first
The spring attachment part 13a is placed on the safety cover 13 side,
and a second spring attachment part 14a that holds the other end.
are respectively provided on the safety cover support member 14 side, and further, the curved spring wire 15 has a linear portion that can be inserted into each of the spring attachment portions 13a and 14a from either the front side or the rear side of the body. and a curved portion that connects the linear portions, and the first spring attachment portion 13a and the second
A structure of a safety cover attachment part of a rotary tiller, in which an arrangement interval A with a spring attachment part 14a is set such that it becomes larger or smaller as it goes downstream in the spring insertion direction.