JP2012000075A - Fixing structure for tilling claw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the attachment and detachment of tilling claws easy from their mounting parts installed at a tilling rotary shaft, even if they are manually operated, and fixing a plurality of tilling claws by an equal force at the mounting parts.SOLUTION: A fixing structure for tilling claw is characterized by including mounting parts 2 installed at the tilling rotary shaft, tilling claws 1 and fixing tools 3 for the mounting parts with tilling claws, freely fitting the tilling claws 1 at the mounting parts 2, rotating the fixing tools 3 nipped between the mounting parts 2 and the tilling claws 1 by <180° angle, compressing the overhanging upper surface parts 35 of the fixing tools 3 and the mounting parts 2, and compressing the lower surface of the overhanging parts of the fixing tools 3 or the projecting part 33 of the fixing tools and the tilling claws 1 to fix the mounting parts 2 with the tilling claws 1.

Description

The present invention relates to an attachment portion provided on a tillage rotation shaft of a tillage working machine, a tilling claw, and a fixing structure using a fixing device between the attachment portion and the tilling claw.

  Conventionally, to make it easier to replace the tillage claw when it reaches the limit of use, depending on the condition of the soil and purpose of use, or when it is destroyed, the tillage claw can be attached and detached. The thing fixed to the attaching part provided in the tilling rotating shaft is considered.

  For example, Patent Document 1 describes a structure in which a tilling claw is fixed to a disc-shaped mounting portion provided on a tilling rotation shaft of a tilling work machine using bolts and nuts. Patent Document 2 describes a structure in which a tilling claw is inserted into a claw holder provided on a tilling rotation shaft of a tilling work machine and is fixed using a bolt and a nut via a joint member.

Japanese Patent Laying-Open No. 2005-176676 (paragraph 0005, FIG. 1) Japanese Patent Laying-Open No. 2006-254787 (paragraph 0014, FIG. 2)

  In the tillage claw fixing structure described in Patent Documents 1 and 2 described above, a structure in which the attachment portion provided on the tillage rotation shaft of the tillage work machine and the tillage claw are fastened with a bolt and a nut is adopted. It must also rotate, and it takes time to replace the tillage nail by replacing it when it reaches the limit of use or replacing the tillage nail according to the purpose of use or by breaking by touching the roots or rocks of hard trees . Furthermore, when at least one of the bolt and the nut is rusted due to long-term use, the work of replacing the tillage nail requires more time.

  In addition, it is difficult to fix a plurality of tilling claws to the mounting part provided on the tillage rotation shaft of the tillage work machine with the same force, so the bolts and nuts are loosened in places where the screw-fitting pressure between the bolts and nuts is small. In addition, the attachment part is worn or damaged, and further, there is a risk that the tilling nail is detached during the operation.

  Although a power tool is also used for screwing a bolt and a nut, there is generally no power source for operating the power tool in farm fields such as fields and fields where work is actually performed. Also, if you forget to charge the rechargeable power tool or there is a case where there is not enough electricity remaining for the work due to the self-discharge of the rechargeable battery, in such a case manually Bolts and nuts must be screwed to fix the tilling nail, and it takes time to attach and detach the tilling nail, and it is also difficult to fix each tilling nail with equal force.

  Therefore, in the present invention, even with a manual operation, the tilling claw can be easily attached and detached, and a plurality of tilling claws can be fixed to the mounting portion provided on the tilling rotary shaft of the tilling work machine with equal force, even if it is manual. The purpose is to do.

  That is, the tilling nail fixing structure according to the present invention includes a mounting portion provided on the tilling rotation shaft, a tilling nail for plowing the field, and a fixing tool for the mounting portion and the tilling nail, One of the tilling claws is loosely fitted to the other of the mounting portion and the tilling claw, and the fixing device sandwiched between the mounting portion and the tilling claw is rotated at an angle of less than 180 degrees. A tilling nail for fixing the attachment portion and the tilling claw by pressing a part of the fixing device and the mounting portion and pressing the other portion of the fixing device and the tilling nail. It is a fixed structure.

  If it is such, there exist the following effects.

  In other words, when the fixing device is first arranged so as to be sandwiched between the mounting portion and the tilling nail, it is in a state where it can move easily (hereinafter also referred to as the first state). Rotating at an angle of less than 180 degrees, pressing a part of the fixing device and the mounting part, and pressing the other part of the fixing tool and the tilling nail to fix the mounting part and the tilling nail (hereinafter referred to as the first) Therefore, even with manual operation, the attachment portion and the tilling claw can be easily attached and detached.

  And even if it is manual, when fixing a plurality of tilling claws to the mounting portion, any tilling claw can be fixed with an equal force, so that the tilling claws fastened with an insufficient force loosen. It is possible to avoid the risk of wear or breakage of the mounting part due to the attachment and the detachment of the tilling nail during the work.

  And since the attachment part and the tilling nail are not in close contact with at least one surface parallel to the insertion direction, it is difficult to attach and detach the attachment part and the tilling nail due to sticking due to the occurrence of rust in long-term use. Can be reduced. In addition, it is possible to reduce a situation in which solid matter such as soil or gravel gets into the gap between the attachment portion and the tilling nail during use and it becomes difficult to attach and detach the tilling nail.

  Moreover, according to the fixing device which concerns on this invention, compared with the volt | bolt and nut which must always be used by a pair, it is easy to carry, use, and preserve | save, and it does not produce confusion also when handling a several fixing device.

  In order to easily rotate the fixing device, it is preferable that the attachment portion has at least one or more through holes that can expose a part of the fixing device on the side surface.

  In order to easily ensure the first state in which the mounting portion, the tilling claw, and the fixing device can move easily with each other, the cultivation claw is loosely fitted with the fixing device at one end thereof. It is desirable to have the shape to do.

  In order to easily rotate the fixing device and to easily ensure the first state in which the mounting portion, the tilling claw, and the fixing device can easily move relative to each other, the fixing device has a through-hole in the mounting portion. It is desirable to have a more exposed base and an overhang having a shape that fits gently with the tillage nail.

  In order to securely fix the fixing tool and the tilling nail and easily secure the second state, the overhanging part of the fixing tool fits gently into the tilling nail recessed part that is recessed with a step on the tilling nail. In addition, it is desirable that the overhanging portion climbs the step of the tilling nail recessed portion so that the upper surface of the overhanging portion is pressed against the inner surface of the mounting portion.

  In order to securely fix the mounting portion and the fixing device and to ensure the second state easily, the fixing device includes an overhanging portion in which a surface contacting the mounting portion by rotating rotates continuously in the circumferential direction. Is desirable.

  In order to securely fix the fixing tool and the tilling nail and easily secure the second state, the fixing tool has a slit portion in the overhanging portion, and the overhanging portion is elastically deformed by the slit portion when the fixing device is rotated. It is desirable to do.

  In order to securely fix the mounting portion and the tilling claw and to easily secure the second state, the mounting portion and the tilling claw are provided on the side surface opposite to the mounting portion through-hole formed in the mounting portion. It is desirable to fit via the provided attachment part recessed part or attachment part through-hole, and the cultivation nail convex part provided in the said cultivation nail | claw.

  In order to ensure that the tilling nail and the fixing device are securely fixed and to ensure the second state, the tilling nail and the fixing device are provided with a tilling nail recess or a tilling nail through hole provided in the tilling nail. It is desirable that the fitting is performed via a fixing device convex portion provided on the overhanging portion of the fixing device.

  As described above, according to the tillage claw fixing structure and the fixture according to the present invention, it is possible to fix with a rotation that is extremely smaller than that of the bolt and the nut. Detachable.

  And even if it is manual, when fixing a plurality of tilling claws to the mounting portion, any tilling claw can be fixed with an equal force, so that the tilling claws fastened with an insufficient force loosen. It is possible to avoid the damage caused by the wear of the mounting portion and the danger that the tilling claw is detached during the work.

  And since the attachment part and the tilling nail are not in close contact with at least one surface parallel to the insertion direction, it is difficult to attach and detach the attachment part and the tilling nail due to sticking due to the occurrence of rust in long-term use. Can be reduced. In addition, it is possible to reduce a situation in which solid matter such as soil or gravel gets into the gap between the attachment portion and the tilling nail during use and it becomes difficult to attach and detach the tilling nail.

  Moreover, according to the fixing device which concerns on this invention, compared with the volt | bolt and nut which must always be used by a pair, it is easy to carry, use, and preserve | save, and it does not produce confusion also when handling a several fixing device.

The schematic diagram which shows the attaching part which concerns on the form of Example 1 of this invention, a tilling nail | claw, and a fixing tool. The schematic diagram which shows the attaching part which concerns on the form of Example 1 of this invention, a tilling nail, and a fixing tool from the opposite direction of FIG. The schematic diagram which shows the 1st state in the embodiment. (A) The side view of a 1st state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. (B) The side view of the 2nd state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. The schematic diagram which shows the attaching part which concerns on the form of Example 2 of this invention, a tilling nail, and a fixing device. (A) The side view of a 1st state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. (B) The side view of the 2nd state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. The schematic diagram which shows the attaching part which concerns on the form of Example 3 of this invention, a tilling nail, a fixing tool, etc. FIG. The schematic diagram which shows the 1st state in the embodiment. (A) The side view of a 1st state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. (B) The side view of the 2nd state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. The bottom view of the fixing device in the embodiment. The schematic diagram which shows the attaching part which concerns on the form of Example 4 of this invention, a tilling nail, a fixing tool, etc. FIG. The schematic diagram which shows the 1st state in the embodiment. (A) The side view of a 1st state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. (B) The side view of the 2nd state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. The schematic diagram which shows the attaching part, tilling nail | claw, and fixing tool which concern on the form of Example 5 of this invention. The schematic diagram which shows the 1st state in the embodiment. (A) The side view of a 1st state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment. (B) The side view of the 2nd state at the time of seeing from the edge part surface 16 side of the tilling nail | claw in the embodiment.

  Hereinafter, the embodiment regarding the tilling nail fixing structure according to the present invention will be described in detail. The embodiments described below are preferable specific examples for carrying out the present invention, and thus various technical limitations are made. However, the present invention is particularly limited in the following description. Unless otherwise specified, the present invention is not limited to these forms.

  FIG.1 and FIG.2 is a schematic diagram which shows the attaching part which concerns on the form of Example 1 of this invention, a tilling nail | claw, and a fixing tool.

  The tilling claw 1 has one end fixed to a plurality of mounting portions 2 provided on the tilling rotation shaft by the fixing structure of the present invention, and the other end projects outward from the mounting portion 2 and becomes radial. Moreover, it has the tilling nail recessed part 11 which provided the level | step difference and was recessedly provided in the surface side of the one end part so that it might fit loosely with the overhang | projection part 32 of the fixing device 3, and the tilling nail recessed part 11 And the formation surface of the tilling claw recessed portion 11 of the tilling claw 1 have a step. Further, the tilling claw 1 has a tilling claw through-hole 12 made of a circular hole for fitting in the recessed portion of the tilling nail recessed portion 11 with the fixing device convex portion 33 of the fixing device 3. And it has the cultivation nail convex part 13 projected on the back surface side of the one end part of the cultivation nail | claw 1 in the shape which has a contrasting bulge in the substantially elliptical short axis direction. In addition, the cultivation nail convex part 13 of an Example is formed by pushing the recessed inside of the cultivation nail recessed part 11 in the shape smaller than the recessed shape of the cultivation nail recessed part 11 further, and for this reason. In the cultivating claw recessed portion 11, a depression having the shape of the cultivating claw convex portion 13 is formed in the surface of the recessed surface provided with a step. In addition, since the other end has a shape such as a straight line or a curve, it is possible to plow the field or remove weeds.

  A plurality of the mounting portions 2 are provided radially to project outside the tillage rotary shaft by integral molding with the tillage rotary shaft, welding with the tillage rotary shaft, or the like. Moreover, it has the attachment part through-hole 21 in the side surface, and the attachment part through-hole 21 'of the opposite surface of the same shape, and is insertion insertion larger enough than the edge part surface 16 of the cultivation nail 1 in the insertion insertion direction of the cultivation nail 1 It has a hole 22.

  The fixing device 3 is a device composed of a base portion 31 and an overhang portion 32 in order to fix the mounting portion 2 and the tilling claw 1. Further, the overhang portion 32 has a shape having a symmetric bulge in the short axis direction of a substantially oval shape that is gently fitted to the tillage claw recess 11 recessed in the tillage claw 1. On the lower surface of the protruding portion 32, there is a fixing device convex portion 33 made of a cylinder or a polygonal column for fitting with the tilling claw through-hole 12. In addition, on the lower surface of the overhang portion 32, there is an overhang lower surface inclined portion 34 that contacts the tillage claw 1 while rotating.

  One end of the tillage claw 1 is loosely fitted into the attachment portion insertion hole 22. A substantially elliptical short portion provided in one end of the tilling nail 1 and a mounting portion through hole 21 ′ opposite in shape to the mounting portion through hole 21 having a substantially elliptical shape having a contrasting bulge in the short axis direction. The cultivating claw convex portion 13 having a shape having a contrasting bulge in the axial direction is fitted, and the attachment portion 2 and the cultivating claw 1 can be fixed.

  After fitting the attachment part 2 and the tilling claw 1, the fixing device 3 is passed through the attachment part through-hole 21, and the cultivation claw 1 and the cultivation claw recessed part 11 recessed at one end of the cultivation claw 1 and Although it is fixed in the insertion direction of the tillage claw 1 by being fitted to the tillage claw through hole 12, a first state can be formed which can easily move in the insertion direction and the perpendicular direction.

  Then, by inserting a tool that fits into the base 31 of the fixing device and rotating the fixing device 3 at a 90 degree angle clockwise or counterclockwise, the tilling claw 1, the mounting portion 2, and the fixing device 3 are A second state can be formed that cannot move easily relative to each other. In this case, a socket wrench socket (JIS B 4636) or the like, which is a general-purpose tool, can be used as a tool to be fitted to the base 31, but is limited to a general-purpose tool as long as the fixing tool 3 can be rotated. Absent.

  The rotation angle of the fixing device is not limited to the embodiment, and it is preferable to rotate the fixing claw 1, the attachment part 2, and the fixing device 3 at an angle larger than 0 degree and smaller than 180 degrees. 30 degrees or more and 120 degrees or less is more preferable, and 60 degrees or more and 120 degrees or less is most preferable.

  In this embodiment, one end of the base 31 of the fixing device 3 has a hexagonal shape. However, the present invention is not limited to this shape, and other polygonal shapes and flat projections are also used. In this case, it is a general-purpose tool such as a spanner (JIS B 4630), an eyeglass wrench (JIS B 4632), a monkey wrench (JIS B 4604), a pliers (JIS B 4623), etc. The projection can be sandwiched and rotated using a tool improved in the above.

  FIG. 3 is a diagram in which the components described in FIG. 1 or FIG. 2 are combined by the method described above, and is a schematic diagram showing a first state.

  FIG. 4A is a side view of the first state when viewed from the end face 16 side of the tilling claw 1. In this state, since the tilling claw 1 and the fixing device 3 are loosely fitted, one end of the tilling claw 1, the mounting portion 2, and the fixing device 3 can easily move relative to each other.

  FIG. 4B is a side view of the second state when viewed from the end face 16 side of the tilling claw 1. In this state, the tilling claw 1, the attachment portion 2, and the fixing device 3 cannot move easily.

  As the fixing device 3 is rotated, the extended lower surface inclined portion 34 provided on the lower surface of the extended portion 32 is cultivated by the cultivation nail recessed portion 11 and the cultivation nail 1 cultivated with a step formed on the cultivation nail 1. By climbing a step with the formation surface of the nail recess 11, the lower surface of the overhanging portion 32 presses the formation surface of the tillage nail recess 11 of the tillage nail 1 (FIG. 4B). Further, in order to determine the fixing position of the tilling claw 1 and the mounting portion 2 and to reliably prevent the tilling claw 1 from coming off from the mounting portion 2 by use, the fixing tab of the tilling claw through-hole 12 and the fixing device 3 is fixed. The part 33 is fitted.

  Similarly, as the fixing device 3 is rotated, the overhanging upper surface portion 35 comes into contact with the inner surface of the mounting portion 2 and presses the mounting portion 2.

  The material of at least one member used for the tilling nail 1, the attachment portion 2, and the fixing device 3 is not particularly limited, but is preferably a metal from the viewpoint of strength, durability, and toughness, and is further steel. Preferably, it is a spring steel material.

  FIG. 5 is a schematic diagram illustrating an attachment portion, a tilling nail, and a fixing device according to a mode of Example 2 of the present invention.

  The tilling claw 1 has one end fixed to a plurality of mounting portions 2 provided on the tilling rotation shaft by the fixing structure of the present invention, and the other end projects outward from the mounting portion 2 and becomes radial. Moreover, it has the tilling nail recessed part 11 provided with the level | step difference so that it might fit loosely with the overhang | projection part 32 of the fixing tool 3 in the one end part, the tilling nail recessed part 11 and the tilling nail 1 There is a difference in level with the surface on which the tilling nail recess 11 is formed. Further, the tilling claw 1 has a tilling claw through-hole 12 that fits with the fixing tool projection 33 of the fixing tool 3. In addition, since the other end has a shape such as a straight line or a curve, it is possible to plow the field or remove weeds.

A plurality of the mounting portions 2 are provided radially to project outside the tillage rotary shaft by integral molding with the tillage rotary shaft, welding with the tillage rotary shaft, or the like. Moreover, it has the attachment part through-hole 21 in the side surface, and the attachment part through-hole 21 'of the opposite surface of the same shape, and is insertion insertion larger enough than the edge part surface 16 of the cultivation nail 1 in the insertion insertion direction of the cultivation nail 1 It has a hole 22.
Further, in order to facilitate the rotation of the fixture 3, a contrasting bulge is formed in the fitting insertion hole 22 in the direction of the attachment portion through hole 21 and the attachment portion through hole 21 ′ on the opposite surface.

  The fixing device 3 is a device composed of a base portion 31 and an overhang portion 32 in order to fix the mounting portion 2 and the tilling claw 1. Further, the overhang portion 32 has a shape having a symmetric bulge in the short axis direction of a substantially oval shape that is gently fitted to the tillage claw recess 11 recessed in the tillage claw 1. On the lower surface of the protruding portion 32, there is a fixing device convex portion 33 that fits into the tilling claw through-hole 12. In addition, on the lower surface of the overhang portion 32, there is an overhang lower surface inclined portion 34 that contacts the tillage claw 1 while rotating. In addition, the overhanging portion 32 has a slit portion 39 cut in a line shape from the outside in the horizontal direction.

  One end of the tillage claw 1 is loosely fitted into the attachment portion insertion hole 22. A substantially elliptical short axis provided at one end of the tilling nail 1 and a mounting part through hole 21 on the opposite side of the same shape as the mounting part through hole 21 having a bulge contrasting with the substantially elliptical short axis direction. The cultivating claw convex part 13 having a shape having a contrasting bulge in the direction is fitted, and the attachment part 2 and the cultivating claw 1 can be fixed.

  After fitting the attachment part 2 and the tilling claw 1, the fixing device 3 is passed through the attachment part through-hole 21, and the cultivation claw 1 and the cultivation claw recessed part 11 recessed at one end of the cultivation claw 1 and Although it is fixed in the insertion direction of the tillage claw 1 by being fitted to the tillage claw through hole 12, a first state can be formed which can easily move in the insertion direction and the perpendicular direction.

  Then, by inserting a tool that fits into the base 31 of the fixing device and rotating the fixing device 3 at a 90 degree angle clockwise or counterclockwise, the tilling claw 1, the mounting portion 2, and the fixing device 3 are A second state can be formed that cannot move easily relative to each other. In this case, a socket wrench socket (JIS B 4636) or the like, which is a general-purpose tool, can be used as a tool to be fitted to the base 31, but is limited to a general-purpose tool as long as the fixing tool 3 can be rotated. Absent.

  FIG. 6A is a side view of the first state when viewed from the end face 16 side of the tilling claw 1. In this state, since the tilling claw 1 and the fixing device 3 are loosely fitted, one end of the tilling claw 1, the mounting portion 2, and the fixing device 3 can easily move relative to each other.

  FIG. 6B is a side view of the second state when viewed from the end surface 16 side of the tilling claw 1. In this state, the tilling claw 1, the attachment portion 2, and the fixing device 3 cannot move easily.

  As the fixing device 3 is rotated, the extended lower surface inclined portion 34 provided on the lower surface of the extended portion 32 is cultivated by the cultivation nail recessed portion 11 and the cultivation nail 1 cultivated with a step formed on the cultivation nail 1. By climbing a step with the formation surface of the claw recess 11, the lower surface of the overhanging portion 32 presses the formation surface of the cultivation claw recess 11 of the tillage claw 1 (FIG. 6B). Further, in order to determine the fixing position of the tilling claw 1 and the mounting portion 2 and to reliably prevent the tilling claw 1 from coming off from the mounting portion 2 by use, the fixing tab of the tilling claw through-hole 12 and the fixing device 3 is fixed. The part 33 is fitted.

  Similarly, as the fixing device 3 is rotated, the overhanging upper surface portion 35 comes into contact with the inner surface of the mounting portion 2 and presses the mounting portion 2. In addition, since the slit part 39 is provided, the overhang | projection part 32 which contacts the inner surface of the attaching part 2 elastically deforms, and it becomes easy to rotate the fixing tool 3. FIG.

  FIG. 7 is a schematic diagram illustrating an attachment portion, a tilling nail, a fixing device, and the like according to the third embodiment of the present invention.

  Here, the fixing device 3 is a device composed of a base portion 31 and an overhang portion 32 for fixing the mounting portion 2 and the tilling claw 1. Moreover, in order to fit and press with the tilling nail | claw 1 gently, it has the fixing tool convex part 33 in the lower surface of the overhang | projection part 32. FIG.

  The base 31 of the fixing device 3 is loosely fitted in the attachment part through-hole 21, but the protruding part 32 does not penetrate. The base portion 31 can be loosely fitted so as to be exposed from the attachment portion through hole 21. The C-shaped retaining ring 4 can be fitted into the C-shaped retaining ring groove 37 exposed from the mounting portion through-hole 21 so that the mounting portion 2 and the fixture 3 can be loosely fitted.

  Since the insertion hole 22 is sufficiently larger than the end surface 16 of the tilling nail 1, one end of the tilling nail 1 can be easily inserted into the insertion hole 22. Since at least the two inclined surfaces 14 and the fixing device convex portion 33 are loosely fitted, one end portion of the tilling claw 1 can be easily inserted into the fitting insertion hole 22 while being slid. Thus, the one end part of the tilling nail 1, the attachment part 2, and the fixing device 3 can form the 1st state which can move easily mutually.

  Here, the C-type retaining ring is a retaining ring (JIS B 2804) having both ends drilled, and is a device that is wound around the fixing device 3 and loosely fits the mounting portion 2 and the fixing device 3. is there.

  Then, by inserting a tool having a part that fits into the fixing tool through-hole 36 and rotating the fixing tool 3 at an angle of 90 degrees clockwise or counterclockwise, the tilling claw 1, the mounting portion 2, and the fixing tool 3 can form a second state that cannot move easily relative to each other. In this case, a ratchet handle for socket wrench (JIS B 4641), a spinner handle for socket wrench (JIS B 4638), etc., which are general-purpose tools, can be used as an instrument having a fitting part. If it can rotate, it will not be restricted to a general purpose tool.

  And the one end part of the instrument which has the said fitting part penetrates the fixing instrument through-hole 36, is inserted in the tilling nail through-hole 12, and the predetermined position of the one end part of the tilling nail 1 is made into the fixing instrument 3 The fixing device can be rotated while it is fixed with.

  FIG. 8 is a diagram in which the components illustrated in FIG. 7 are combined by the method described above, and is a schematic diagram illustrating a first state.

  FIG. 9A is a side view of the first state when viewed from the end surface 16 side of the tilling claw 1. In this state, since the tilling claw 1 and the fixing device 3 are loosely fitted, one end of the tilling claw 1, the mounting portion 2, and the fixing device 3 can easily move relative to each other.

  FIG. 9B is a side view of the second state when viewed from the end face 16 side of the tilling claw 1. In this state, the tilling claw 1, the attachment portion 2, and the fixing device 3 cannot move easily.

  As the fixing device 3 is rotated, at least two inclined surfaces 14 in which the fixing device convex portion 33 is loosely fitted are rubbed up, and the fixing device convex portion 33 presses the tilling claw 1. Further, in order to reliably prevent the tilling claw 1 from being pulled out by use, a tilling claw stopper 15 is provided.

  Further, as the fixing device 3 rotates, the fixing device convex portion 33 rubs up the at least two inclined surfaces 14, so that the overhanging upper surface portion 35 presses the inner surface of the mounting portion 2. The overhanging upper surface portion 35 preferably has a large contact area so as to be firmly pressed against the inner surface of the mounting portion 2, and more preferably the contact surface is continuous in the circumferential direction.

  FIG. 10 is a view from the lower surface side of the fixing device 3. The fixing tool convex portion 33 is loosely fitted with at least two inclined surfaces 14 provided on the tilling claw 1 in the first state, and presses the tilling claw 1 in the second state.

  FIG. 11: is a schematic diagram which shows the attaching part which concerns on the form of Example 4 of this invention, a tilling nail, a fixing tool, etc. FIG.

  The base 31 of the fixing device 3 is loosely fitted in the attachment part through-hole 21, but the protruding part 32 does not penetrate. The base portion 31 can be loosely fitted so as to be exposed from the attachment portion through hole 21. The C-shaped retaining ring 4 can be fitted into the C-shaped retaining ring groove 37 exposed from the mounting portion through-hole 21 so that the mounting portion 2 and the fixture 3 can be loosely fitted.

  Since the insertion hole 22 is sufficiently larger than the end surface 16 of the tilling nail 1, one end of the tilling nail 1 can be easily inserted into the insertion hole 22. Since the linear slide groove 17 and the fixing device convex portion 33 are loosely fitted, one end portion of the tilling claw 1 can be easily inserted into the fitting insertion hole 22 while being slid. Thus, the one end part of the tilling nail 1, the attachment part 2, and the fixing device 3 can form the 1st state which can move easily mutually.

  Then, by inserting a tool having a part that fits into the fixing tool through hole 36 and rotating it at a 90 ° angle clockwise or counterclockwise, the tilling claw 1, the mounting portion 2, and the fixing tool 3 are mutually connected. A second state that cannot be moved easily can be formed.

  When the fixing device 3 is rotated, the fixing device convex portion 33 rubs up the linear slide groove 17, and the fixing device convex portion 33 presses the tilling claw 1. Further, in order to reliably prevent the tilling claw 1 from being pulled out by use, a tilling claw stopper 15 is provided.

  Further, the protruding upper surface portion 35 presses the inner surface of the mounting portion 2 as the fixing device convex portion 33 rubs up the linear slide groove 17 by the rotation of the fixing device 3.

  FIG. 12 is a diagram in which the components illustrated in FIG. 11 are combined by the method described above, and is a schematic diagram illustrating a first state.

  FIG. 13A is a side view of the first state when viewed from the end surface 16 side of the tilling claw 1. In this state, since the tilling claw 1 and the fixing device 3 are loosely fitted, one end of the tilling claw 1, the mounting portion 2, and the fixing device 3 can easily move relative to each other.

  FIG. 13B is a side view of the second state when viewed from the end face 16 side of the tilling claw 1. In this state, the tilling claw 1, the attachment portion 2, and the fixing device 3 cannot move easily.

  FIG. 14: is a schematic diagram which shows the attaching part, tilling nail | claw, and fixing tool which concern on the form of Example 5 of this invention.

  The base 31 of the fixing device 3 is loosely fitted in the attachment part through-hole 21, but the protruding part 32 does not penetrate. The base portion 31 can be loosely fitted so as to be exposed from the attachment portion through hole 21. Since the insertion hole 22 is sufficiently larger than the end surface 16 of the tilling nail 1, one end of the tilling nail 1 can be easily inserted into the insertion hole 22. Thus, the one end part of the tilling nail 1, the attachment part 2, and the fixing device 3 can form the 1st state which can move easily mutually.

  Then, by inserting a tool having a part that fits into the fixing tool through hole 36 and rotating it at a 90 degree angle clockwise or counterclockwise, the tilling claw 1, the attachment part 2, and the fixing tool 3 are mutually connected. A second state that cannot be moved easily can be formed.

  When the fixing device 3 is rotated, the fixing device convex portion 33 rubs down the annular slide groove 19, the fixing device convex portion 33 fits into the tilling claw recess 18 and presses the tilling claw 1.

  Further, when the fixing device 3 is rotated, the fixing device convex portion 33 rubs down the annular slide groove 19 so that the overhanging upper surface inclined portion 38 provided in the overhanging upper surface portion 35 is provided with the same inclination angle. The inner surface of the part 2 is pressed.

  FIG. 15 is a diagram in which the components illustrated in FIG. 14 are combined by the method described above, and is a schematic diagram illustrating a first state.

  FIG. 16A is a side view of the first state when viewed from the end face 16 side of the tilling claw 1. In this state, since the tilling claw 1 and the fixing device 3 are loosely fitted, one end of the tilling claw 1, the mounting portion 2, and the fixing device 3 can easily move relative to each other.

  FIG. 16B is a side view of the second state when viewed from the end surface 16 side of the tilling nail. In this state, the tilling claw 1, the attachment portion 2, and the fixing device 3 cannot move easily.

1 ... Tilling claw 11 ... Tilling claw recessed part 12 ... Tilling claw through hole 13 ...・ ・ Tilling claw convex part 14 ・ ・ ・ ・ ・ ・ ・ ・ ・ Inclined surface 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Tilling nail retaining 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ End surface 17 ·································································································· ······························································································ Insertion hole 3 .... Fixing device 31 ... Base 32 ... Overhang 33 ... Fixing device convex 34 ... .... Overhanging lower surface inclined part 35 ... Overhanging upper surface part 36 ... Fixed instrument through hole 37 ... C-shaped retaining ring groove 38 ... Overhang sloped part 39 ... Slit part 4 ... ..... C-type retaining ring

Claims (9)

A cultivation claw fixing structure for fixing one end of a cultivation claw for cultivating a field to a mounting part provided on a cultivation rotation shaft,
The mounting portion, the tilling claw, and a fixture for the mounting portion and the tilling claw,
Either one of the attachment part and the tilling claw is loosely fitted to the other of the attachment part and the tilling claw, and the fixing device sandwiched between the attachment part and the cultivation claw is less than 180 degrees. The mounting portion and the tilling claw are fixed by rotating at an angle, pressing a part of the fixing device and the mounting portion, and pressing the other portion of the fixing device and the tilling nail. Tillage nail fixing structure. The tilling nail fixing structure according to claim 1, wherein the attachment portion includes at least one through-hole capable of exposing a part of the fixing device on a side surface thereof. The tilling claw fixing structure according to claim 1 or 2, wherein the tilling claw has a shape that gently fits with the fixing device at one end thereof. The said fixing device comprises the base part exposed from the through-hole of the said attaching part, and the overhang | projection part which has a shape which fits the said tilling nail | claw loosely mutually. The tillage nail fixing structure described in 1. The overhanging portion of the fixing device gently fits into the concave portion of the tillage nail that is recessed with a step on the tillage nail, and the overhanging portion runs over the step of the nail recess of the tillage nail, The tilling nail fixing structure according to claim 3 or 4, wherein an upper surface of the projecting portion is pressed against an inner surface of the mounting portion. The tilling nail fixing structure according to claim 4 or 5, wherein the fixing device includes an overhanging portion in which a surface that comes into contact with the attachment portion by rotation rotates continuously in a circumferential direction. The tilling nail according to any one of claims 4 to 6, wherein the fixing device has a slit portion in the overhanging portion, and the overhanging portion is elastically deformed by the slit portion when the fixing device is rotated. Fixed structure. The mounting part and the tilling claw are provided with a mounting part recess or a mounting part through hole provided on the side surface opposite to the mounting part through hole formed in the mounting part, and a tilling claw convex part provided on the tilling claw. The tilling nail fixing structure according to claim 2, wherein the plowing nail fixing structure is fitted. The cultivating claw and the fixing device are fitted via a cultivating claw recessed portion or a cultivating claw through hole provided in the cultivating claw and a fixing device convex portion provided in an overhanging portion of the fixing device. The tilling nail fixing structure according to any one of claims 3 to 8, wherein:

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