JPH0655894U - Locking device for folding two-post safety frame in tractor - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The upper frame can be tilted up and down and locked and released in the middle position very easily with one touch, and the working machine hits the upper frame when folded and damages the working machine and vehicle body. Provided is a locking device for a foldable two-post safety frame for a tractor, which can prevent accidents that may occur. [Structure] Two brackets 8 and 8 facing the upper part of the lower frame 5 in which the upper frame 6 is joined by a pin 9 so as to be able to move up and down.
An arc-shaped guide hole 10 centering on the pin is provided in the guide hole, and a circular lock hole 11 having a diameter slightly larger than the hole width of the guide hole is provided in the guide hole.
a, 11b, 11c are formed, and a shaft 14 with two heads, in which two cone-shaped lock members 12 and 13 on the shaft head side and the shaft end side are loosely fitted with their tops facing each other, is inserted into the guide hole, and the shaft head is formed. Side lock member is urged toward the shaft end direction by the spring 15 on the shaft head side of the headed shaft, and the lock member on the shaft end side is brought into contact with the cam surface 17a of the lock lever 17 with a cam surface to lock the lock lever. It is locked or unlocked by pushing down or pulling up.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a collapsible two-pillar safety frame provided at the rear of the machine to prevent the operator from being injured when the tractor is working due to the fall of the tractor. The present invention relates to a foldable two-post safety frame locking device for a tractor, which can be easily locked and unlocked by operating a lever.

[0002]

[Prior art]

 Conventionally, there is a foldable two-post safety frame that is attached to the rear of the tractor to prevent the tractor from falling and injuring the operator during work on the tractor. The pillar safety frame has a pair of lower frames that are erected on both sides of the rear part of the tractor. The two upper brackets that hold the lower end of the upper frame are fixed to the upper ends of the lower frames. The upper frame can be tilted between the brackets. The lower end is pin-joined to each of the two brackets, and lock pin holes are provided in the two brackets facing each other at angular positions on the circumference centered on the pin, the upper frame is upright, and the middle. The lock pin is inserted through the lock pin hole provided in the upper frame so that the upper frame is tilted and locked at each intermediate angular position. According to the conventional foldable two-post safety frame described above, the up and down movement of the upper frame and the locking and unlocking at each intermediate angular position must be performed by inserting and removing the lock pin each time. May fall out and be lost.In addition, in the case of a tractor equipped with various types of work equipment at the rear, when the work equipment that was installed when the top frame was folded was lifted, the work equipment hits the top frame and the work equipment and There is a problem that the tractor may be damaged.

[0003]

[Problems to be solved by the present invention]

 The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to solve the problems.Therefore, the upper frame of the safety frame is tilted and locked and unlocked at each intermediate angular position with a single touch. It is easy to do, and there is no fear of losing the lock pin as with conventional equipment, and even when the work implement attached to the tractor is lifted when the top frame is folded, the work implement will hit the top frame and An object of the present invention is to provide a folding type two-post safety frame locking device for a tractor that can avoid accidents that damage the tractor.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a foldable two-post safety frame for a tractor in which an upper frame is joined to the upper ends of a pair of lower frames that are erected on both sides of the rear part of the tractor. Two brackets facing each other holding the lower end of the upper frame are fixed to the upper end, and the lower frame is pin-joined between the brackets so that the upper frame can be raised and lowered. An arcuate guide hole is provided as the center, and when the upper frame is in a tilted or intermediate angular position, each intersection position where the axis of the upper frame intersects the arcuate guide hole is provided. A circular lock hole having a diameter slightly larger than the width of the guide hole is formed in the guide hole of the two opposing brackets in which the circular lock hole is formed. Lock of Material is inserted through a headed shaft that is loosely fitted with the tops facing each other, and the locking member on the shaft head side is bottomed by a spring fitted to the shaft expansion part formed on the shaft head of the headed shaft. Is always urged toward the shaft end, and the lock member on the shaft end side pushes down on a pin that penetrates the shaft end in the direction orthogonal to the shaft as a shaft, and the lock lever cam with a cam surface pivotally attached so that it can be raised and lowered. The bottom of the tractor is abutted against the surface, and the lock members at both ends of the headed shaft are locked or unlocked in the circular lock holes of the guide hole by pushing down and pulling up the lock lever. It features a locking device for the two-post safety frame.

[0005]

[Action]

 As described above, according to the present invention, the lock members at both ends of the headed shaft of the locking device are locked or unlocked in the circular lock holes of the arc-shaped guide groove by pushing down and pulling up the lock lever. Therefore, the upper frame of the two-pillar safety frame can be tilted up and down and locked and unlocked at each intermediate angle position by pushing down the lock lever and pulling up and pulling the one-touch operation. Since it is integrated into the main body, there is no fear of losing it like the lock pin of the conventional two-post safety frame, and when the upper frame is folded, the lock lever can be pulled up to release the lock. Even if the work implement attached to the tractor is lifted and the work implement hits the upper frame, the upper frame will not move to the lifted work implement. Is fled to the upright direction, accident damage to the working machine and tractor are avoided.

[0006]

【Example】

 Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 is a side view of the tractor with the upper frame of the folding two-post safety frame according to the present invention in an upright position, FIG. 2 is a side view of the tractor with the upper frame folded, and FIG. 3 is the same safety. In the enlarged side view of the frame, (A) shows the upper frame in a standing lock state, (B) shows the upper frame in a half-folding lock state, and (C) shows the upper frame in a folding lock state. Fig. 4 is a detailed vertical sectional view of the locking device of the present invention. (A) shows the upper frame upright, half-folded, when the locking device is locked at each folding folding position, (B) shows the upper frame upright, half-folded. (C) Unlocks the locking device when folding, unlocking the locking device at each angular position of folding, and raises the safety frame, folds it halfway, and folds it. Show respectively the states when shifting the arcuate guide hole of each angular position intermediate.

In FIGS. 1 and 2, 1 is a tractor, 2 is a driver's seat, 3 is a work machine mounted on the rear of the tractor, 4 is a folding type two-pillar safety frame according to the present invention, and the safety frame 4 is of the tractor 1. A pair of left and right lower frames 5 made of round pipes standing upright on both sides of the rear part are joined to upper and lower parts of the same upper frame 6 made of round pipes via a locking device 7 so that they can be tilted up and down in the longitudinal direction of the machine body. It is made up of

As shown in FIGS. 3 and 4, the locking device 7 has two opposed brackets 8, 8 holding the lower end of the upper frame 6 fixedly mounted on the upper end of the lower frame 5, and the brackets 8, The lower frame is joined to the upper frame 6 by a pin 9 so that the upper frame 6 can be tilted up and down in the front-back direction of the machine body, and an arc-shaped guide hole 10 centered on the pin 9 is provided in each of the two opposing brackets 8 and 8. In the guide hole 10, the axis L of the upper frame 6 is formed at each of the upright, half-folded, and folded angular positions of the upper frame 6 shown in FIGS. 3 (A), (B), and (C). Circular lock holes 11a, 11b, 11c having a diameter slightly larger than the hole width of the guide hole 10 are formed at each intersecting position intersecting the arc-shaped guide hole 10, and the circular lock holes 11a, 11b, 11c are formed. In the guide holes 10 of the two brackets facing each other The two shaft-side and shaft-end side cone-shaped lock members 12 and 13 are inserted through a headed shaft 14 that is loosely fitted with the tops facing each other. The bottom surface is constantly urged in the axial end direction by the coil spring 15 fitted to the expanded shaft portion 14a formed on the shaft head, and the lock member 13 on the shaft end side is orthogonal to the shaft end portion. The bottom surface is abutted on the cam surface 17a of the lock lever 17 with a cam surface pivotally attached so that it can be pushed up and down with the pin 16 penetrating in the direction as the axis, and by pushing down and pulling up the lock lever 17, The lock members 12 and 13 at both ends of the headed shaft 14 are locked or unlocked in one of the circular lock holes 11a, 11b and 11c of the proposed groove 10.

The operation of the lock device 7 having the above-described configuration will be described below. FIG. 4 () shows the upper frame 6 shown in FIGS. 3 (A), 3 (B), and 3 (C) at each angular position of standing, half-folding, and folding. As shown in A), when the lock lever 17 is pushed down, the cam surface 17a of the lock lever pushes the bottom surface of the shaft end side lock member 13 of the headed shaft 14, and the reaction force causes the headed shaft 14 to move. And the coil spring 15 is compressed between the shaft head and the bottom surface of the lock member 12 on the shaft head side, and the expansion force of the coil spring 15 at this time causes the coil spring 15 to move to the shaft head side and the shaft end side. The tops of the lock members 12, 13 are fitted into one of the circular lock holes 11a, 11b, 11c. At this time, the size of the headed shaft 14 is set so that there is almost no gap between the bottom surface of the lock member 12 on the shaft head side and the stepped portion of the shaft expanding portion 14a of the shaft head of the headed shaft 14. Therefore, the lock members 12 and 13 on both sides that have fallen into one of the circular lock holes 11a, 11b, and 11c are the steps of the shaft expanded portion 14a of the shaft head of the headed shaft 14 and the lock lever 17. The lock members 12 and 13 are restrained between the cam surface 17a and the coil springs 15 to push back the coil springs 15 and do not escape from the circular lock holes 11a, 11b and 11c, and the upper frame 6 is raised, half-folded and folded at various angles. Locked in one of the positions.

When changing the angular position of the upper frame 6, as shown in FIG. 4 (B), when the lock lever 17 is pulled up to the unlocked state, the cam surface 17a of the lock lever 17 with the cam surface is moved to the head. Withdrawal from the bottom surface of the shaft end side lock member 13 of the attached shaft 14, the headed shaft 14 is pushed back to the shaft head side by the expansion force of the coil spring 15 on the shaft head side, and the lock member 12 on the shaft head side and the shaft end side. , 13 are released from the restraint by the stepped portion of the shaft expanded portion 14a and the cam surface 17a of the lock lever 17, and can escape from the circular lock holes 11a, 11b, 11c against the expansion force of the coil spring 15. Becomes

Therefore, when the upper frame 6 is rotated in the angle direction in the unlocked state of FIG. 4B, the lock members 12 and 13 rotate and the cone-shaped top has a circular lock hole 11a. The coil springs 15 are lifted by 11b and 11c to compress the coil springs 15 to widen the gap and move to the narrow arc-shaped guide hole 10 as shown in FIG. 4 (C). Further, when the upper frame 6 is rotated to the positions of the circular lock holes 11a, 11b, 11c for changing the angle, the state shown in FIG. 4B is obtained, and when the lock lever 17 is pushed down here, the state shown in FIG. 4A is obtained. The upper frame 6 is locked at the changed angular position. Even when the angle of the upper frame 6 is changed through the circular lock holes 11a, 11b, 11c on the way, the lock member 12 is simply passed through the circular lock holes 11a, 11b, 11c passing through the upper frame 6. , 13 expands / contracts the coil spring 15 to expand / contract the space and get over it.

As shown in FIG. 2, when the upper frame 6 is folded and the work machine 3 is mounted on the rear part of the tractor, the work machine 3 is lifted by the work machine 3 to hit the upper frame 6 and the work machine 3 and the tractor. If there is a risk of damaging item 1, raise the lock lever to unlock it as shown in Fig. 4 (B), lift work implement 3 and work implement 3 hits upper frame 6. However, the upper frame 6 is pushed by the lifted work implement 3 and escapes in the standing direction, and damage to the work implement 3 and the tractor 1 is avoided.

FIGS. 5 and 6 disclose another proposal of a locking device for a safety frame having the same purpose as that of the above embodiment. FIG. 5 is an enlarged side view of the safety frame, and FIG. Fig. 6 is a vertical cross-sectional view of the locking device when standing locked, (B) shows the upper frame in the half-folding locked state, and (C) shows the safety frame in the folding locked state when the upper frame is folded. (A) shows the upper frame when the lock device is locked at the upright, half-folded, and folded angular positions, and (B) shows the upper frame when the lock device is unlocked at the upright, half-folded, and folded angular positions ( C) shows respective states when the locking device is unlocked, the safety frame is raised, half-folded, and the arc-shaped guide hole in the middle of each angular position of folding is shifted. It

As shown in FIGS. 5 and 6, the lock device 20 has two brackets 23, 23 facing each other that hold the lower end of the upper frame 22 at the upper end of the lower frame 21, and the brackets 23, 23 are fixed. Although the upper frame 22 is vertically movable in the front-rear direction of the machine body and the lower end portion is joined with the pin 24 as in the embodiment of the present invention, the lock device 20 has a circle centered around the pin 24. The circular guide holes 25 and the upper frame 22 are locked in the upright, half-folded, and folded angular positions. The circular lock holes 26a, 26b, and 26c having a diameter slightly larger than the hole width of the guide hole 25 are provided on one side of the bracket. It is provided only in 23. The locking and unlocking of the locking device 20 is performed by screwing the male screw 28 with the knob 27 in the upper frame 22 at each position of the circular lock holes 26a, 26b and 26c, and screwing the screw into the screw hole 29. A cylindrical lock member 30 having a tapered taper 30a formed at the tip of the male screw 28 is loosely fitted by being urged by a coil spring 31 in the direction of the male screw tip. When the upper frame 22 is locked in one of the circular lock holes 26a, 26b, 26c, the female screw hole 29 of the upper frame 22 is formed in one of the circular lock holes 26a, 26b, 26c as shown in FIG. 6 (A). Then, the male screw 28 with the knob 27 is screwed into the female screw hole 29 of the upper frame 22. As the male screw 28 is screwed in, the coil spring 31 is compressed by the screw head portion 28a inside the knob 27, and the end surface of the tubular locking member 30 on the knob 27 side is abutted on the screw head portion 28a and screwed in. When stopped, the locking member 30 is constrained between the screw head 28a and one of the circular locking holes 26a, 26b, 26c and the upper frame 22 is locked in its set angular position.

When changing the angular position of the upper frame 22, the male screw 28 with the knob 27 is turned in the returning direction, and as shown in FIG. 6B, the screw head 28 a and the lock member 30 on the knob 27 side. When a clearance is provided between the lock member 30 and the end surface, the lock member 30 compresses the coil spring 31 to be unlocked so that the lock member 30 can be released from the circular lock holes 26a, 26b and 26c. Therefore, if the upper frame 22 is rotated to the position of the circular lock holes 26a, 26b, 26c for changing the angle and the male screw 28 with the knob 27 is tightened, the upper frame 22 is locked at that position. When the upper frame 22 is folded and the working machine is attached to the rear part of the tractor, if the unlocking state is maintained as described above, the working machine is lifted to move the working machine to the upper frame 22 as in the locking device 7 of the above-described embodiment. Even if it hits, the upper frame 22 is pushed by the lifted work implement and escapes in the standing direction, thereby avoiding damage to the work implement and the tractor.

[0016]

[Effect of device]

 As described above, according to the present invention, the lock members at both ends of the headed shaft of the lock device are locked or unlocked in the circular lock holes of the arc-shaped guide groove by pushing down and pulling up the lock lever. Since the upper frame of the two-pillar safety frame is tilted and locked and unlocked at each intermediate angle position, it is extremely easy to push down and pull up the lock lever, and the lock lever is locked. Since it is integrated into the device, there is no fear of losing it like the lock pin of the conventional two-post safety frame, and when the upper frame is folded, the lock lever is pulled up to unlock. Even if the work implement attached to the tractor is lifted and the work implement hits the upper frame, the upper frame will not move to the lifted work implement. To escape the standing direction, such as an accident of damaging the working machine or a tractor is avoided, but exert a practically useful effect.

[0017]

[Brief description of drawings]

FIG. 1 is a side view of a tractor according to the present invention with an upper frame of a folding two-post safety frame in an upright position.

FIG. 2 is a side view of the tractor with the upper frame folded.

FIG. 3A is an enlarged side view of the safety frame when the upper frame is standing locked. (B) is an enlarged side view of the safety frame when the upper frame is half-folded and locked. (C) is an enlarged side view of the safety frame when the upper frame is folded and locked.

FIG. 4A is a detailed vertical cross-sectional view showing the locked state of the lock device at each of the upright, half-folded, and folded angular positions of the upper frame. FIG. 6B is a detailed vertical cross-sectional view showing a state when the lock device is unlocked at each of the upright, half-folded, and folded angular positions of the upper frame. FIG. 6C is a detailed vertical cross-sectional view showing a state in which the lock of the locking device is released, the safety frame is raised, half-folded, and the arc-shaped guide hole in the middle of each angular position of folding is shifted.

FIG. 5 (A) is an enlarged side view of the folding two-post safety frame according to the alternative of the present invention when the upper frame is erected and locked. (B) is an enlarged side view of the same safety frame when the upper frame is half-folded and locked. (C) is an enlarged side view of the safety frame when the upper frame is folded and locked.

FIG. 6A is a detailed vertical cross-sectional view showing a locked state of the locking device at each angular position of the upper frame standing, half-folding, and folding. FIG. 6B is a detailed vertical cross-sectional view showing a state where the upper frame is in an upright position, half-folded position, and folded position when the lock device is unlocked. (C) unlocks the locking device, raises the safety frame, folds it halfway,
FIG. 6 is a detailed vertical cross-sectional view showing a state in which an arcuate guide hole in the middle of each folding angular position is shifted.

[0018]

[Explanation of symbols]

 1 tractor 3 working machine 4 foldable two-post safety frame 5 lower frame 6 upper frame 7 locking device 8 bracket 9 upper frame raising / lowering pin 10 arcuate guide holes 11a, 11b, 11c circular lock hole 12 shaft head side Lock member 13 Shaft end side lock member 14 Headed shaft 14a Shaft expanded portion 15 Coil spring 16 Lock lever for pushing down and pulling up 17 Lock lever with cam surface 17a Lock lever cam surface

Claims (1)

[Scope of utility model registration request] 1. A foldable two-post safety frame for a tractor, wherein an upper arch-shaped frame is joined to the upper ends of a pair of lower frames that are erected on both sides of the rear part of the tractor so as to be able to tilt up and down. Two opposing brackets holding the lower end of the upper frame are fixed to the upper frame, and the lower frame is pin-joined between the brackets so that the upper frame can be erected up and down. An arc-shaped guide hole is provided in the guide hole, and the guide hole is provided at each intersecting position where the axis of the upper frame intersects with the arc-shaped guide hole when the upper frame is in the upright and intermediate angular positions. A circular lock hole having a diameter slightly larger than the hole width is formed, and two cone-shaped lock members on the shaft head side and the shaft end side are provided at the top of the guide holes of the two opposed brackets in which the circular lock holes are formed. Opposite Then, the loosely fitted headed shaft is inserted, and the lock member on the shaft head side is constantly urged to the shaft end direction by the spring fitted to the shaft expanded portion formed on the shaft head of the headed shaft. The lock member on the shaft end side is pressed down around a pin penetrating the shaft end in a direction orthogonal to the shaft, and the bottom surface is abutted on the cam surface of the lock lever with a cam surface pivotally attached so that it can be raised and lowered. The locking of the folding two-post safety frame in the tractor, characterized in that the lock members at both ends of the headed shaft are locked or unlocked in the circular lock holes of the guide hole by pushing down and pulling up the head. apparatus.