JP4113325B2 - Spring pressure adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spring pressure adjusting device that can be applied to various fixtures and the like.
[0002]
[Prior art]
Conventionally, in this kind of spring pressure adjusting device, as shown in FIGS. 11 to 12, a large number of square grooves 25 'are provided on the shaft 20, and a cam type is used as the stopper 24' to wind the shaft 20 around. The plate of the cam type stopper 24 ′ is fixed to the square groove 25 ′ by the pressure of a spring separate from the compression spring 22, or a large U groove is provided on the shaft (not shown). In some cases, a spring pressure type ball is dropped into the groove and fixed, and in addition, a large number of holes are provided in the shaft, and an R pin or the like is inserted and removed.
[0003]
[Problems to be solved by the invention]
However, each of the above-mentioned conventional shafts with a groove is not only troublesome in groove processing, but also has a complicated stopper mechanism for fixing the groove, and the production cost is high, and the shaft is large. In terms of manufacturing the groove, it was disadvantageous in terms of cost and weight, such as increasing the diameter of the shaft so as not to be disadvantageous in terms of strength, or using a round bar.
Further, in the method of making a hole in the shaft, it is necessary to insert and remove the pin every time the spring pressure is adjusted, so that the operation is troublesome and the working efficiency is poor.
An object of the present invention is to improve the above-described conventional problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a compression spring is wound around a shaft, and one side of the compression spring is received via a seat, and the spring pressure is applied to the other side of the shaft. In the pressure adjusting device, a stopper that contacts the other seat of the compression spring and surrounds the shaft is provided, and the stopper has a hole through which the shaft is inserted in a central portion that is substantially U-shaped in a side view. And a pair of left and right sandwiching portions whose tips toward the hole project obliquely downward, and further, the standing plate portions on both side surfaces facing the upward direction opposite to the projecting direction of the sandwiching portion are knob portions. When the left and right knobs are pinched with fingers, the pair of left and right holding parts of the stopper are separated from the shaft, and when the fingers are released, the pair of left and right holding parts hold the shaft. By pinching it, the stopper shaft Characterized in that the that the fixing position and the adjustable.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An example of an embodiment of the present invention will be described with reference to the following drawings.
1 is an overall side view in which a rotary working machine is mounted on the rear part of a traveling machine body, FIG. 2 is an overall perspective view of the rotary working machine with a part omitted, 1 is a traveling machine body, 2 is a rotary working machine, The rotary work machine 2 is mounted on the rear part of the traveling machine body 1 by an auto hitch 3 in the same manner as the conventional one at the top mast 4 at the upper center of the front part and mounting points (not shown) provided on both sides. Then, predetermined power is transmitted by the PTO shaft 5 of the traveling machine body 1 to perform rotary work such as tillage work.
[0009]
The rotary working machine 2 is provided with a gear case 6 at the lower part of the top mast 4, and a screw for adjusting the tool bar 7 extending in the width direction of the working machine for mounting a tail wheel or a stand on the rear upper part. An adjusting device 8 of the type is provided on the top mast 4.
A pair of left and right arms 9, 9 'are fixed to both side surfaces of the gear case 6, and a chain case 10 is fixed to the left end of the gear case 6 so that a plurality of tilling claws 11,. No) is mounted between the drive side bearing portion at the lower part of the chain case 10 and a passive side bearing bracket (not shown) fixed to the lower side of the side plate 12 at the right end, and the tilling claws 11. It is configured to perform work by rotating at a speed.
[0010]
Next, in the cover structure of the rotary working machine 2, a bag-like intermediate cover 15 having a side cross section is pivotally attached to the rear end portion of the main cover 14, and the rear cover 16 is directed downward at the rear end portion. The central portion of the main cover 14 is connected to an operating lever 19 provided on the top mast 4 via a rod 18 to a bracket 17 fixed on the upper surface, and the operating lever 19 is rotated back and forth. By moving, the main cover 14 is rotated back and forth.
Further, brackets 15a for supporting the rear cover 16 via suspension rods 20 are fixedly provided at two positions on the left and right of the upper surface of the intermediate cover 15. The bracket 15a is formed on a plate 15b having a reverse letter-shape when viewed from the side (FIG. 1). It is mounted and fixed. The plate 15b serves as a reinforcing plate that supports the load applied via the suspension rod 20, and also serves as a stopper that prevents the rear cover 16 from rotating too much.
[0011]
3 to FIG. 10, the compression spring 22 is wound around the suspension rod (shaft) 20, and the compression spring 22 includes upper and lower seats 23, A stopper 24 made of a leaf spring material is in contact with the lower receiving seat 23 and surrounds the suspension rod 20.
Of course, the compression spring 22 may be replaced by any other means as long as the compression spring 22 has a similar effect to that of a compression spring or a compression bulletin.
[0012]
As shown in FIGS. 4 to 5, the stopper 24 has a substantially U-shape when viewed from the side. The lower surface forms a receiving portion 24a, and the standing plate portions on both side surfaces form knob portions 24b and 24b. When the seat portion 24a is viewed from the lower surface (FIG. 7), a hole 24c through which the suspension rod 20 is inserted is provided in the center portion, and a pair of clamping portions 24d and 24d are provided on the left and right sides. When the left and right knobs 24b and 24b are pinched, the lower surface seat 24a of the stopper 24 is curved and the holding parts 24d and 24d are separated from the hanging rod 20. When the fingers are released, the holding parts 24d and 24d hold the hanging rod 20. It is the composition to do.
Since the tip of the clamping portion 24d protrudes obliquely downward, if the stopper 24 is pushed downward by the compression spring 22, the left and right clamping portions 24d and 24d bite into the suspension rod 20 and are fixed. When the stopper 24 is pushed upward, the suspension rod 20 is configured to be slidable.
[0013]
Further, as shown in FIG. 6, if the receiving portion 24 a of the stopper 24 is configured such that only the outer peripheral portion of the lower receiving seat 23 is in contact with the stopper 24 and a gap is provided on the central portion side of the receiving seat 23, The facing clamping portion 24d can easily bite into the suspension rod 20, and the position of the stopper 24 can be fixed more reliably.
[0014]
Further, as shown in FIGS. 9 to 10, when the suspension rod 20 is made of a thin pipe material and an extremely small groove 25 is provided at an appropriate position by press molding, the position of the stopper 24 can be more securely fixed, and the groove 25 is fixed to the stopper. 24 is a guide for position adjustment, but if a sign such as a scale is attached around each groove 25,..., The spring pressure of the left and right suspension rods 20 can be quickly and evenly adjusted, and the spring pressure can be adjusted efficiently. Of course.
In this case, since the position of the stopper 24 can be fixed by the extremely small groove 25, it can be made of a press-formed product of a thin pipe material, is light in weight, low in production cost, and relatively strong.
[0015]
The spring pressure adjusting device according to the present invention is configured as described above, and the operator needs to set the left and right spring pressures of the rear cover 16 in advance according to the field conditions and the like before starting the rotary work. In this case, if both the knob portions 24b, 24b of the stopper 24 are pinched as shown in FIG. 5 to bend the receiving portion 24a, the holding portion 24d releases the holding rod (shaft) 20 and the stopper 24 Is in a state where it can be fixed at any position. Therefore, when the knob portion 24b is released at an appropriate position, the holding portion 24d bites into the suspension rod 20 and the position of the stopper 24 is fixed.
[0016]
It is not necessary to change the left and right spring pressure of the rear cover 16 if the work is started in this state and the work accuracy is appropriate, but there is a gap between the surface of the tillage field and the lower end of the rear cover 16, The operator needs to adjust the spring pressure when the spring pressure of the rear cover 16 with respect to the farming field scene is inappropriate, such as when a large amount of cultivation soil or the like accumulates on the inside and the work resistance increases. At this time, when both the knob portions 24b and 24b are pinched again to release the holding portion 24d from the suspension rod 20, and when the knob portion 24b is released at an appropriate position, the holding portion 24d bites into the suspension rod 20 and stops. The position is fixed.
[0017]
As a result, the suspension rod (shaft) 20 of the present invention does not require processing, and the manufacturing cost is reduced, and the stopper 24 device fixed to the suspension rod has a simple configuration, so that the manufacturing cost is low. The spring pressure can be adjusted quickly and easily. The stopper 24 can be set at an arbitrary position, and the weight can be reduced as a whole.
[0018]
When the seat 24a of the stopper 24 is in contact with the stopper 24 only at the outer periphery of the seat 23 and a gap is provided at the center of the seat 23 (FIG. 6), the stopper 24 is suspended. The clamping effect on the rod 20 is great, and the fixing force is increased.
Furthermore, when grooves are formed at arbitrary positions on the suspension rod (shaft) 20 (FIGS. 9 and 10), the stopper 24 can be securely fixed even if the groove 25 is very shallow and small. This is possible, is advantageous in terms of strength, is low in processing cost, and can quickly and evenly adjust the spring pressure of the left and right suspension rods 20, thereby efficiently adjusting the spring pressure.
Furthermore, when the suspension rod (shaft) 20 is a thin-walled pipe and the groove processing is press molding (FIGS. 9 and 10), the stopper 24 can be securely attached to the suspension rod (shaft) 20 even if the groove processing is shallow and small. In addition, the weight can be reduced and the manufacturing cost can be reduced.
[0019]
In addition, although the example which employ | adopted the spring pressure adjusting device of this invention was employ | adopted as the rear-cover suspension rod 20 of the rotary working machine 2, it cannot be overemphasized that it can apply to other various fixing tools.
[0020]
【The invention's effect】
In the present invention, as described above, the compression spring 22 is wound around the shaft 20, and one side of the compression spring 22 is received through the receiving seat 23, and the spring pressure is applied to the other side of the shaft. In the pressure adjusting device, a stopper 24 that contacts the seat 23 on the other side of the compression spring 22 and surrounds the shaft 20 is provided, and the stopper 24 has a shaft 20 at a central portion that is substantially U-shaped in a side view. A hole 24c to be inserted is provided, and a pair of left and right holding parts 24d and 24d whose tip toward the hole 24c protrudes obliquely downward is provided, and is further opposite to the protruding direction of the holding parts 24d and 24d. Standing plate portions on both side surfaces facing the upper side form knob portions 24b and 24b. When the left and right knob portions 24b and 24b are pinched with fingers, the pair of left and right sandwiching portions 24d and 24d of the stopper 24 are pivoted. From 20 Is, left and right release the finger pair of holding portions 24d, a configuration in which 24d to sandwich the shaft 20, by pinching the knob portion 24b, since the freely adjust the fixing position with respect to the axis 20 of the stopper 24, hanging The rod (shaft) 20 does not need to be processed, and the manufacturing cost is low. The stopper 24 device fixed to the rod 20 has a simple structure, has few breakdowns and can be manufactured at low cost, and the spring pressure can be adjusted. The stopper 24 can be set quickly and easily at an arbitrary position, and the overall weight can be reduced.
[0021]
Further, when the seat 24 a of the stopper 24 is in contact with the stopper 24 only at the outer periphery of the seat 23 and a gap is provided in the center of the seat 23, the stopper 24 is clamped to the suspension rod 20. The effect is large and the fixing force is increased.
Furthermore, when grooves are formed at several arbitrary positions on the suspension rod (shaft) 20, even if the grooves 25 are very shallow and small, the stopper 24 can be fixed securely, which is advantageous in terms of strength. Thus, the processing cost is low, and the spring pressure of the left and right suspension rods 20 can be made uniform, so that the adjustment work of the spring pressure is performed efficiently.
Furthermore, when the suspension rod (shaft) 20 is a thin-walled pipe and the grooving is press-molded, even a shallow and small grooving can be securely fixed, and the weight can be reduced, reducing the production cost. It can be cheap.
In short, the present invention has many various practical effects as described above.
[Brief description of the drawings]
FIG. 1 is an overall side view in which a rotary working machine is mounted on a rear portion of a traveling machine body.
FIG. 2 is an overall perspective view of a rotary working machine with a part omitted.
FIG. 3 is a partial cross-sectional side view of a hanging rod (shaft) portion.
FIG. 4 is an enlarged cross-sectional view of the main part, showing a fixed state of the stopper.
FIG. 5 shows the nipping release state of the stopper.
FIG. 6 shows another example of the fixed state of the stopper.
FIG. 7 is a bottom view of the stopper portion.
FIG. 8 is a side view of the same.
FIG. 9 is a partial side sectional view of another example of a hanging rod (shaft) portion.
FIG. 10 is a partially enlarged sectional view of FIG. 9;
FIG. 11 is a partial cross-sectional side view of a conventional suspension rod (shaft) portion.
FIG. 12 is a bottom view of the stopper portion.
[Explanation of symbols]
2 Rotary work machine 15 Intermediate cover 15a Bracket 15b Plate 16 Rear cover 20 Hanging rod 22 Compression spring 23 Seat 24 Stopper 24a Seat portion 24b Knob portion 24c Hole 24d Nipping portion 25 Groove

Claims (1)

In the spring pressure adjusting device in which the compression spring 22 is wound around the shaft 20 and one side of the compression spring 22 is received via the receiving seat 23 and the pressure of the spring is applied to the other side of the shaft, the compression spring 22 is provided with a stopper 24 that is in contact with the seat 23 on the other side and surrounds the shaft 20, and the stopper 24 has a hole 24c through which the shaft 20 is inserted in a central portion that is substantially U-shaped in a side view. A pair of left and right sandwiching portions 24d and 24d whose front ends toward the hole 24c project obliquely downward are provided, and further, both side surfaces of the sandwiching portions 24d and 24d on the opposite side to the projecting direction are formed on both sides. The standing plate portion has knob portions 24b and 24b. When the left and right knob portions 24b and 24b are pinched with fingers, the pair of left and right holding portions 24d and 24d of the stopper 24 are separated from the shaft 20 and the fingers are released. Left and right one Holding portion 24d, a configuration in which 24d to sandwich the shaft 20, the spring pressure adjusting device, characterized in that the freely adjust the fixing position with respect to the axis 20 of the stopper 24.

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