JPH0589111U - Tractor safety frame equipment - Google Patents

Abstract

(57) [Summary] [Purpose] In a safety frame that can be rotated back and forth, it does not rotate naturally even if the rotation restriction is released, and it also prevents noise generated from the connection part of the safety frame. With the goal. [Structure] In a safety frame 6 in which an upper frame 6b arranged at a rear portion of a vehicle body of a tractor T can be rotated back and forth, a pipe 27 of an upper frame 6b which is a rotation fulcrum portion and a bolt hole 6d of a mounting bracket 6c are bolted. Through 25,
A nut 32 is screwed to the bolt 25 via a flat spring 31 so that the turning force of the upper frame 6b can be adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a folding device for a safety frame of a tractor.

[0002]

[Prior Art]

 Conventionally, riding-type tractors have been equipped with a safety frame for the purpose of ensuring the safety of workers when the tractor falls. However, the tractor equipped with the safety frame has a high vehicle height, and the safety frame hits the branches of trees when working in the orchard, and the safety frame hits the ceiling of the barn when stored in a barn. There was. Therefore, a technique has been proposed in which the safety frame is lowered at the time of working in the orchard or storing it in a barn, such as the technique described in Japanese Utility Model Publication No. 59-18947. This technique uses a mechanism for selectively tilting the safety frame by means of a link-shaped connecting plate and a link pin in order to rotate the safety frame relatively easily.

[0003]

[Problems to be solved by the device]

 However, in the above technique, the safety frame is rotated to a predetermined position after removing the link pin and the retaining pin of the link pin that prevent the safety frame from rotating when the safety frame rotates. Since the structure regulates the rotation by aligning the pin holes and inserting the link, the link pin, and the retaining pin of the link pin, the state where the regulation is released by removing the link pin and the retaining pin of the link pin. In the above, the safety frame may start to fall naturally due to a small external force, which causes a problem that it is dangerous when rotating. Also, when the safety frame is set up during normal operation, the safety frame causes ridiculous noise due to the vibration of the tractor. . Therefore, the present invention rotates the safety frame by generating an appropriate frictional force on the contact surface of the pivoting fulcrum of the safety frame and applying a certain amount of force even if the regulation of the safety frame is released. The purpose is to construct a safety frame that cannot prevent the noise generated from the safety frame.

[0004]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention provides a safety frame in which a pair of left and right lower frames are erected on the rear part of the body of a tractor, and an upper frame connected to the upper end of the lower frame is rotatable back and forth. The rotary fulcrum member of the upper frame is provided with a threaded portion at one end or both ends, and an elastic member is interposed in the threaded portion to fasten the threaded portion, so that the turning force of the upper frame can be adjusted.

[0005]

[Action]

 A lower end of the upper frame 6b is fitted and pivotally supported by an attachment metal fitting 6c fixed to the upper ends of the lower frames 6a and 6a that are erected at the rear of the vehicle body of the tractor T, and can be rotated about the pivotal support. The fulcrum of the rotation is such that the bolt 25, which is a fulcrum fulcrum member, penetrates through the pipe 27 of the upper frame 6b and the bolt hole 6d of the fitting 6c, and the bolt 25 has a flat spring 31 which is an elastic member. The nut 32 is screwed through the nut 32. By tightening and tightening the nut 32, an appropriate frictional force is generated on the contact surface of the rotation fulcrum portion, and the end portion of the nut 32 is locked and the bolt 25 is split. The pin 33 is penetrated to prevent the nut 32 from rotating, and the nut 32 is positioned. Then, the rotation causes the plurality of pin holes 29a, 29b, 29c ... on the fixed plate 29 fixedly provided at the lower end of the upper frame 6b and the pin holes 6e on the mounting bracket 6c to coincide with each other, thereby elastically urging. By inserting the fixed pin 26, the rotation is restricted and it can be maintained at an arbitrary position.

[0006]

【Example】

 The problem to be solved and the means to solve the present invention are as described above. Next, referring to the accompanying drawings, FIG. 1 shows a tractor T equipped with the safety frame device of the present invention. Overall side view, FIG. 2 is a side view of the rear part of the tractor T in a normal operating state, FIG. 3 is a rear view of the same, FIG. 4 is an enlarged rear view of a bent portion when rotation is restricted, and FIG. 6 and 7 are enlarged side views of the bent portion at the time of rotation, and FIG. 8 is an enlarged rear view of the bent portion at the time of canceling the rotation restriction.

Referring to FIG. 1, the overall structure of the tractor T having the safety frame mounting structure of the present invention will be described. The tractor T is provided with front wheels 1.1 and rear wheels 2.2. An engine and the like are housed in the bonnet 4 of the section, a steering wheel 5 is projected at the rear of the bonnet 4, and a driver's seat 3 is provided at the rear of the steering wheel 5. In the rear part of the driver's seat 3, an upper frame 6b of a safety frame 6, which is an essential part of the present invention, is erected by surrounding a lower part with a covering member 17. The front wheel 1.1 is steerable and rotatable by rotating the handle 5.

2 and 3, a hydraulic case 8 for accommodating a hydraulic cylinder for rotating the lift arm 7 is mounted on a mission case 9 at the rear of the body of the tractor T. The lower frames 6a, 6a of the safety frame 6 of the present invention are erected on the rear axle cases 10 attached to both sides, and the rear axles 11, 11 which are supported by the rear axle case 10 and extend laterally. The rear wheels 2.2 are pivotally supported, and a PTO shaft 12 is provided so as to project from the rear surface of the mission case 9.

The safety frame 6 is composed of a pair of left and right lower frames 6a, 6a, a front view type upper frame 6b, and mounting brackets 6c, 6c. The lower end of the lower frame 6a is attached to the rear axle case 10 described above. A bracket 14 fixed to the bolt 13 is fixed to the bracket 14 via a washer 38 and a cushion member 15, and a horizontal frame 19 is fixed between the middle portions of the lower frames 6a and 6a. A fender 20 is sandwiched between the lower frame 6a and the horizontal frame 19 and fixed by bolts 21, 21 ..., And a through hole 20a is opened in the upper surface of the fender 20. .. The central portion of the lateral frame 19 is fixed to a mounting member 23 with a bolt 24 via a washer 18 and a cushion member 22, and the mounting member 23 is fixed to the hydraulic case 8 with bolts 44, 44 ... It is fixedly installed on the upper side and is configured to be frame-supported in an H shape by the lower frames 6a, 6a and the horizontal frame 19.

In FIGS. 4 and 5, the upper end of the lower frame 6a has a U-shaped cross-sectional shape in a plan view in a state of penetrating the through hole 20a opened in the upper surface of the fender 20. A mounting metal fitting 6c is fixedly mounted so that the opening side faces rearward, and a bolt hole 6d penetrating a bolt 25 that pivotally supports the lower portion of the upper frame 6b and serves as a pivot fulcrum on the side surface of the mounting metal fitting 6c. , A pin hole 6e into which a fixing pin 26 for restricting the rotation of the upper frame 6b is inserted is formed in the lower portion thereof, and the upper frame 6b is prevented from excessively rotating forward or downward at the upper end of the mounting bracket 6c. A stopper 30 for fixing is fixed.

The upper frame 6b is composed of a frame that is thinner than the inner width so that it can be inserted into the mounting bracket 6c. The pipes 27, which are fulcrums at the time of rotation, are welded and fixed to the lower portions on both sides of the upper frame 6b. So that the bolt 25 can be inserted and a fixing plate 29 is further welded and fixed to the lower end of the upper frame 6b. The fixing plate 29 has a plurality of pin holes on the same radius with the bolt 25 as a center. 29a, 29b and 29c are opened. By inserting the tips of the fixing pins 26 into the pin holes 29a, 29b, 29c, the rotation is restricted so that the upper frame 6b can be fixed. As shown in FIG. 2, the pin hole 29a is fixed at an upright position of the upper frame 6b, and the pin hole 29b is located at a position where the upper frame 6b is inclined rearward and obliquely as shown in FIG. It is something that is fixed. As shown in FIG. 7, the pin hole 29c is for fixing the upper frame 6b at a position where the upper frame 6b is inclined almost horizontally.

A nut 32 is screwed into the bolt 25 penetrating the pipe 27, which serves as a pivotal fulcrum of the upper frame 6b, and the bolt hole 6d of the mounting bracket 6c via a flat spring 31 which is an elastic member. The nut 32 is prevented from rotating by locking the end of the nut 32 and passing the split pin 33 through the bolt 25. Further, in order to insert and support the fixing pin 26 that restricts the rotation, a boss 34 is welded and fixed to the outer surface of the mounting member 6c on the side opposite to the fixing plate 29 at a position concentric with the pin hole 6e. A U-shaped groove 34a is formed on the side surface of the end portion of 34, and a split pin 35 penetratingly fixed to the fixing pin 26 can be engaged with the groove 34a. The bolt 25, which is the rotation fulcrum member, has a threaded portion at one end, but in addition, a pin or the like having a threaded portion at both ends is used as a rotation fulcrum member to be tightened from both sides. It is also possible. Further, the member interposed in the bolt 25 is not limited to the sarabane 31 as long as it is an elastic body, and may be a coil spring or the like.

A grip 36 is fixed to a base end of the fixing pin 26 with a nut 37 to facilitate operation, and a spring 40 and a washer are provided on the shaft on the tip side of the fixing pin 26 between the fittings 6c. 41 is externally fitted and fixed by a clip 42 so that the fixing pin 26 is always biased toward the fixing plate 29. However, the fixing plate 29 may be arranged on the inner side and the grip 36 may be arranged on the outer side, that is, the inside and the outside may be arranged in reverse, or the lower end of the upper frame may be formed in a U shape in a plan view to form the fixing pin. It can be configured to be mounted.

In such a configuration, in a normal operating state, as shown in FIGS. 2 and 4, the upper frame 6a is placed against the stopper 30 and positioned in a substantially vertical state, and the tip of the fixing pin 26 is pin hole 29a. 6e, and by inserting the split pin 35 on the center of the fixing pin 26 into the groove 34a of the boss 34, the fixing pin 26 maintains its position by the urging force of the spring 40 and regulates rotation. Of.

Next, when working in an orchard or when storing in a barn with a low ceiling, the grip 36 provided at the end of the fixing pin 26 is grasped and pulled, and the split pin 35 is pulled out from the groove 34a. Then, as shown in FIG. 5, the fixing pin 26 is rotated and placed on the end face 34b of the boss 34 to maintain the tip of the fixing pin 26 pulled out from the pin holes 29a and 6e. When the tip of 26 is pulled out from the pin holes 29a, 29a, 6e, and 6e, the upper frame 6b can be rotated, and the pin hole 6e and the pin hole 29b or the pin hole 29c are aligned at a desired position to fix the fixing pin. By rotating 26 to align the positions of the split pin 35 and the groove 34a, the fixing pin 26 is inserted into the pin hole 6e side by the urging force of the spring 40, and the upper frame 6b can be fixed at the inclined position shown in FIG. is there.

When the upper frame 6b is fixed (rotation restricted) at the position shown in FIG. 6, the fixing pin 26 is pulled out from the pin hole 29a and slightly rotated, as shown in FIG. If the split pin 35 and the groove 34a are aligned with each other, the upper frame 6b is gradually rotated, and when the pin hole 6e and the pin hole 29b are aligned, the fixing pin 26 is subjected to the urging force of the spring 40. It is possible to regulate the rotation by automatically inserting it.

When the upper frame 6b is fixed at the position shown in FIG. 7, after fixing the fixing pin 26 at the pulled-out position, the end 29d of the fixing plate 29 reaches the position where the stopper 30 comes into contact with the stopper 30. When the upper frame 6b is rotated, the pin hole 6e and the pin hole 29c are aligned with each other, and if the fixing pin 26 is returned to its original position, the upper frame 6b can be fixed at that position. On the contrary, when returning the upper frame 6b to the upright position, the fixing pin 26 is fixed at the pulled-out position, and then the upper frame 6b is pivoted upward to contact the stopper 30, and then the fixing pin 26 is fixed. By returning it to the original position, the upper frame 6b can be fixed at that position.

[0018]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. That is, a nut can be screwed on a bolt serving as a pivot of the upper frame via a flat spring, and an appropriate frictional force can be generated on the contact surface of the pivot, by tightening and tightening the nut. When the tractor is in normal operation, when the upper frame is in a substantially vertical position, the upper frame will not rotate and fall over even if the regulation is released, improving safety. It is possible to prevent the noise generated from the rotation fulcrum of the upper frame due to the vibration of.

[Brief description of drawings]

1 is an overall side view of a tractor T equipped with a safety frame device of the present invention.

FIG. 2 is a side view of a rear portion of the tractor T in a normal operation state.

FIG. 3 is a rear view of the same.

FIG. 4 is an enlarged rear view of a bent portion when rotation is restricted.

FIG. 5 is an enlarged rear view of the bent portion when the rotation restriction is released.

FIG. 6 is an enlarged side view of a bent portion during rotation.

FIG. 7 is an enlarged side view of the bent portion at the time of rotation at another position.

FIG. 8 is an enlarged rear view of the bent portion when the rotation restriction is released.

[Explanation of symbols]

 6 Safety frame 6a Lower frame 6b Upper frame 6c Mounting bracket 25 Bolt 26 Fixing pin 29 Fixing plate 29a Pin hole 31 Sara spring 32 Nut 40 Spring T tractor

Claims (1)

[Scope of utility model registration request] 1. A safety frame in which a pair of left and right lower frames are erected on a rear part of a vehicle body of a tractor, and an upper frame connected to an upper end of the lower frame is rotatable back and forth. One end of a rotation fulcrum member of the upper frame. Alternatively, a safety frame device for a tractor, characterized in that a screw portion is provided at both ends, and an elastic member is interposed and fastened to the screw portion so that the turning force of the upper frame can be adjusted.