Patent Publication Number: US-11661726-B2

Title: Tooth attachment structure for bucket and tooth for bucket

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a U.S. National stage application of International Application No. PCT/JP2020/034163, filed on Sep. 9, 2020. This U.S. National stage application claims priority under 35 U.S.C. § 119(a) to Japanese Patent Application No. 2019-167277, filed in Japan on Sep. 13, 2019, the entire contents of which are hereby incorporated herein by reference. 
     BACKGROUND 
     The present invention relates to a tooth attachment structure for a bucket and a tooth for a bucket. 
     BACKGROUND INFORMATION 
     As a prior art, JP2007-9631A (Japanese published unexamined patent application) discloses a tooth attachment structure for a bucket. In a conventional tooth attachment structure for the bucket, a tooth and a tooth adapter are connected via a pin member. In this case, the pin member is locked by engaging a retainer with the pin member. 
     In the conventional tooth attachment structure for the bucket, the tooth and the tooth adapter are connected by inserting the pin member into pin holes of the tooth and the tooth adapter in a state where the retainer disposed between the tooth and the tooth adapter. 
     In this case, it is difficult to mount the pin member to the tooth and the tooth adapter because a frictional resistance is large when the pin member passes through the retainer. Also, it is difficult to remove the pin member from the tooth and the tooth adapter when the tooth is replaced. 
     An object of the present invention is to provide a tooth attachment structure for a bucket in which a tooth can be easily mounted and dismounted. Also, an object of the present invention is to provide a tooth for a bucket which can be easily mounted to and dismounted from a mounting object. 
     SUMMARY OF THE INVENTION 
     A tooth attachment structure for a bucket according to a first aspect includes a tooth, a pin member, and a lock member. The tooth includes an internal space, a guide groove provided on an inner surface, and a pin hole provided in the guide groove. The pin member is disposed in the pin hole. The lock member locks the pin member. The lock member is disposed in the guide groove. The lock member engages with the pin member by sliding toward the pin member. 
     A tooth for a bucket according to a second aspect includes a tooth body, a guide groove, and a pin hole. The tooth body includes an internal space. The guide groove is provided on an inner surface of the tooth body. The pin hole is provided in the guide groove. 
     A tooth attachment structure for a bucket of the present invention can allow a tooth to be easily mounted and dismounted. Also, a tooth for a bucket of the present invention can easily mount to and dismount from a mounting object. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view of a tooth attachment structure for a bucket according to an embodiment. 
         FIG.  2    is an exploded perspective view of the tooth attachment structure in the embodiment. 
         FIG.  3    is a perspective view of a tooth adapter in the embodiment. 
         FIG.  4 A  is a side view of the tooth adapter in the embodiment. 
         FIG.  4 B  is a sectional view for explaining a through hole of the tooth adapter in the embodiment (a cutting line IVB-IVB of  FIG.  4 A ). 
         FIG.  4 C  is a side view which shows a positional relationship of a pin member and a pin hole in the embodiment. 
         FIG.  5 A  is a side view of the tooth attachment structure in the embodiment. 
         FIGS.  5 B (a)-B(e) are sectional views of the tooth attachment structure in the embodiment (cutting lines (a)-(e) of  FIG.  5 A ). 
         FIG.  6    is a perspective view of a tooth in the embodiment. 
         FIG.  7 A  is a perspective view of a lock member in the embodiment. 
         FIG.  7 B  is a perspective view of a state where the lock member and the pin member are disposed on the tooth adapter in the embodiment. 
         FIG.  8 A  is a side view of the tooth attachment structure in the embodiment (a unlocked state). 
         FIG.  8 B  is a side view of the tooth attachment structure in the embodiment (a locked state). 
         FIG.  9 A  is a side view of the tooth attachment structure in a variation A of the embodiment (the unlocked state). 
         FIG.  9 B  is a side view of the tooth attachment structure in the variation A of the embodiment (the locked state). 
         FIG.  9 C  is a side view of a lock member in the variation A of the embodiment. 
         FIG.  10 A  is a side view which shows a positional relationship of a pin member and a pin hole in a variation B of the embodiment. 
         FIG.  10 B  is a partially enlarged side view of the pin hole in the variation B of the embodiment. 
         FIG.  11 A  is a perspective view of a state where a pin member and a lock member are disposed on the tooth adapter in the other embodiment. 
         FIG.  11 B  is a perspective view of the state where the pin member and the lock member are disposed on the tooth adapter in the other embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Configuration of a tooth attachment structure  1  for a bucket according to the present embodiment will be described with reference to drawings. For example, as shown in  FIG.  1   , the tooth attachment structure  1  is mounted on a bucket  2 . The tooth attachment structure  1  includes a tooth  5 , a pin member  7 , and a lock member  9 . Specifically, the tooth attachment structure  1  includes a tooth adapter  3 , the tooth  5 , the pin member  7 , and the lock member  9 . 
     (Tooth Adapter) 
     As shown in  FIG.  1   , the tooth adapter  3  is provided in the bucket  2 . As shown in  FIG.  2   , the tooth adapter  3  is mounted to the bucket  2  so as to protrude from an opening of the bucket  2 . The tooth adapter  3  is a member that is long in one direction. For example, as shown in  FIG.  2   , a longitudinal direction of the tooth adapter  3  corresponds to a direction in which an axis A 1  extends. The axis A 1  corresponds to a longitudinal direction of a nose portion  21  (described later). 
     As shown in  FIG.  3   , the tooth adapter  3  includes an adapter body  11 , a first pin hole  13  (an example of a through hole), and a recess portion  15 . As shown in FIG.  4 A, the first pin hole  13  extends in a direction orthogonal to the axis A 1  of the tooth adapter  3 . A pin member  7  (see  FIG.  2   ) is disposed in the first pin hole  13 . 
     As shown in  FIG.  4 B , an end portion  13   b  of the first pin hole  13  has a larger diameter than a center portion  13   a  of the first pin hole  13 . For example, an inner peripheral surface of the center portion  13   a  of the first pin hole  13  is formed in a circular shape. A diameter of the center portion  13   a  of the first pin hole  13  is larger than a diameter of the pin member  7 . An inner peripheral surface of the end portion  13   b  of the first pin hole  13  is formed in a circular shape. 
     As shown in  FIGS.  3  and  4 A , the recess portion  15  is formed on a surface on which the first pin hole  13  of the tooth adapter  3  is formed. The lock member  9  is disposed in the recess portion  15  (see  FIG.  7 B ). For example, a part of the lock member  9  is disposed in the recess portion  15 . 
     Specifically, the tooth adapter  3  includes a mounting portion  19  and a nose portion  21 . The mounting portion  19  and the nose portion  21  configures the adapter body  11 . The mounting portion  19  is fixed to the bucket  2 . The recess portion  15  is formed in the mounting portion  19 . 
     The nose portion  21  extends from the mounting portion  19 . For example, the nose portion  21  is integrally formed with the mounting portion  19 . The nose portion  21  protrudes from the mounting portion  19  so as to be away from the bucket  2 . The nose portion  21  is formed in a tapered shape. The nose portion  21  is a member that is long in one direction. The longitudinal direction of the nose portion  21  corresponds to the direction in which the axis A 1  extends. For example, when a front end surface of the nose portion  21  is viewed from the outside, the axis A 1  passes through a center of a tip portion  23  of the nose portion  21  and a center of gravity of the nose portion  21 . The first pin hole  13  is formed on the nose portion  21 . 
     As shown in  FIG.  4 A , the nose portion  21  includes a tip portion  23 , a base end portion  25 , and a connecting portion  27 . As shown in  FIG.  5 A , the tip portion  23  is disposed in an internal space S of the tooth  5  so that the tip portion  23  abut on an inner surface of the tooth  5  in an axial direction in which the axis A 1  of the nose portion  21  extends. 
     As shown in  FIGS.  5 A and  5 B (a), an outer circumference of a cross section, which is obtained by cutting the tip portion  23  with the plane (a) orthogonal to the axis A 1  of the nose portion  21 , is formed in a rectangular shape. “The outer circumference” can be interpreted as “the outer shape”. In the following, “a plane”, which is orthogonal to the axis A 1  of the nose portion  21 , will be described as “a cutting plane”. 
     As shown in  FIG.  4 A , the base end portion  25  is provided successively from the mounting portion  19 . For example, the base end portion  25  is integrally formed with the mounting portion  19 . As shown in  FIGS.  5 A and  5 B (e), an outer circumference of a cross section, which is obtained by cutting the base end portion  25  with a cutting plane (e), is formed in a rectangular shape. 
     As shown in  FIG.  5 A , the connecting portion  27  is provided between the tip portion  23  and the base end portion  25 . For example, the connecting portion  27  is integrally formed with the tip portion  23  and the base end portion  25 . The first pin hole  13  is formed on the connecting portion  27 . 
     An outer surface of the connecting portion  27  is formed in an octagonal shape. For example, each of outer circumferences of cross sections, which is obtained by cutting the connecting portion  27  by each of a cutting plane (b) and a cutting plane (c), is formed in an octagonal shape. An outer circumference of a cross section, which is obtained by cutting the connecting portion  27  with a cutting plane (d) passing through the first pin hole  13 , is formed in an octagonal shape. A portion where the outer circumference of the cross section is formed in an octagonal shape is defined as the connecting portion  27 . 
     More specifically, each of both ends of sides L 1  facing each other on the connecting portion  27  forms a first ridgeline portion R 1  which connects a corner portion of the base end portion  25  and a corner portion of the tip portion  23 . For example, in the connecting portion  27 , an octagonal side L 1  is formed parallel to a plane P 1  which includes the axis A 1  of the nose portion  21  and an axis center A 2  of the pin member  7 . The plane parallel to the plane P 1  on the connecting portion  27  is formed by the octagonal side L 1 . As shown in  FIGS.  3 ,  4 A,  5 B (b),  5 B(c), and  5 B(d), the first ridgeline portion R 1  is formed on an outer surface of the connecting portion  27  by both ends of the octagonal side L 1 . 
     Also, each of corner portions adjacent to both ends of the side L 1  on the connecting portion  27  forms a third ridgeline portion R 3  which connects a corner portion of the base end portion  25  and a corner portion of the tip portion  23 . For example, as shown in  FIGS.  3 ,  4 A,  5 B (b),  5 B(c), and  5 B(d), the third ridgeline portion R 3  is formed on the outer surface of the connecting portion  27  by the corner portion adjacent to the corner portion forming the first ridgeline portion R 1 . 
     As shown in  FIGS.  5 B (b),  5 B(c), and  5 B(d), a side L 3  adjacent to the side L 1  of the connecting portion is a side of an octagonal outer circumference of the connecting portion  27 . The side L 3  forms a surface between the first ridgeline portion R 1  and the third ridgeline portion R 3 . 
     As shown in  FIGS.  5 B (b),  5 B(c), and  5 B(d), a length of the side L 1  at a center portion of the connecting portion  27  in the longitudinal direction (side L 1  in  FIG.  5 B (c)) is shorter than a length of the side L 1  on the base end portion  25  side of the connecting portion  27  (the length of the side L 1  in  FIG.  5 B (d)). Also, a length of the side L 1  at the center portion of the connecting portion  27  in the longitudinal direction (the length of the side L 1  in  FIG.  5 B (c)) is a length of the side L 1  on the tip portion  23  side of the connecting portion  27  (the length of the side L 1  in  FIG.  5 B (b)). 
     Specifically, as shown in  FIG.  3   , the side L 1  gradually becomes shorter from the base end portion  25  toward the center portion of the connecting portion  27  (see  FIGS.  5 B (d) and  5 B(c)). Also, the side L 1  gradually becomes longer from the center portion of the connecting portion  27  toward the tip portion  23  (see  FIGS.  5 B (c) and  5 B(b)). 
     As shown in  FIGS.  5 B (b),  5 B(c), and  5 B(d), a length of the side L 3  at the center portion of the connecting portion  27  in the longitudinal direction (the length of the side L 3  in  FIG.  5 B (c)) is longer than a length of the side L 3  on the base end portion  25  side of the connecting portion  27  (the length of the side L 3  in  FIG.  5 B (d)). Also, a length of the side L 3  at the center portion of the connecting portion  27  in the longitudinal direction (the length of the side L 3  in  FIG.  5 B (c)) is longer than a length of the side L 3  on the tip portion  23  side of the connecting portion  27  (the length of the side L 3  in  FIG.  5 B (b)). 
     Specifically, as shown in  FIG.  3   , the side L 3  gradually becomes longer from the base end portion  25  toward the center portion of the connecting portion  27  (see  FIGS.  5 B (d) and  5 B(c)). Also, the side L 3  gradually becomes shorter from the center portion of the connecting portion  27  toward the tip portion  23  (see  FIGS.  5 B (c) and  5 B(b)). 
     (Tooth) 
     As shown in  FIGS.  1 ,  2 , and  5 A , the tooth  5  is mounted to the tooth adapter  3 . As shown in  FIG.  6   , the tooth  5  includes the internal space S for inserting the tooth adapter  3 . The inner surface of the tooth  5  is formed along an outer surface of the tooth adapter  3 . For example, the tooth  5  includes a guide groove  31  and a second pin hole  33  (an example of a through hole). Specifically, the tooth  5  includes a tooth body  29 , the guide groove  31 , and the second pin hole  33 . 
     The tooth body  29  is formed in a bottomed cylinder shape. An inner surface of the tooth body  29  is formed along an outer surface of the nose portion  21 . For example, the inner surface of the tooth body  29  is formed in a tapered shape. The internal space S is formed by forming the tooth body  29  in this way. The nose portion  21  of the tooth adapter  3  is disposed in the internal space S (see  FIG.  5 A ). 
     The second pin hole  33  penetrates the tooth body  29 . For example, the second pin hole  33  is formed on the tooth body  29  so as to communicate with the first pin hole  13  (see  FIG.  4 A ). The second pin hole  33  is provided in the guide groove  31 . The second pin hole  33  penetrates a bottom portion of the guide groove  31 . The pin member  7  is disposed in the second pin hole  33 . 
     The guide groove  31  is used for guiding the lock member  9  toward the pin member  7 . The guide groove  31  is provided on the inner surface of the tooth  5 . For example, the guide groove  31  is provided on the inner surface of the tooth body  29 . The guide groove  31  extends from an open end of the tooth body  29  toward an tip of the tooth body  29 . Specifically, the guide groove  31  extends from the open end of the tooth body  29  toward the tip of the tooth body  29  along the inner surface of the tooth body  29 . 
     As shown in  FIGS.  5 A and  5 B (a)- 5 B(e), an inner circumference of the cross section, which is obtained by cutting the tooth  5  with the each of cutting planes (a) to (e), is formed as follows. 
     As shown in  FIGS.  5 B (a)- 5 B(e), a portion facing the nose portion  21  on the tooth body  29  includes a first portion  35 , a second portion  37 , and a third portion  39 . 
     As shown in  FIG.  5 B (a), the first portion  35  is a portion where the tooth body  29  faces the tip portion  23  of the nose portion  21 . An inner surface of the first portion  35  is formed along an outer surface of the tip portion  23  of the nose portion  21 . An inner circumference of a cross section, which is obtained by cutting the first portion  35  with the cutting plane (a), is formed in a rectangular shape. As shown in  FIG.  5 B (e), the second portion  37  is a portion where the tooth body  29  faces the base end portion  25  of the nose portion  21 . An inner surface of the second portion  37  is formed along an outer surface of the base end portion  25  of the nose portion  21 . An inner circumference of the cross section, which is obtained by cutting the second portion  37  with the cutting plane (e), is formed in a rectangular shape. 
     As shown in  FIGS.  5 B (b),  5 B(c), and  5 B(d), the third portion  39  is a portion where the tooth body  29  faces the connecting portion  27  of the nose portion  21 . An inner surface of the third portion  39  is formed along an outer surface of the connecting portion  27  of the nose portion  21 . For example, the inner circumference of the cross section, which is obtained by cutting the third portion  39  with each of the cutting plane (b), the cutting plane (c), and the cutting plane (d), is formed into an octagon. 
     In the third portion  39 , an octagonal side L 2  is formed parallel to the plane P 1 . As shown in  FIGS.  6 ,  5 B (b),  5 B(c), and  5 B(d), a second ridgeline portion R 2  is formed on the inner surface of the third portion  39  by each of both ends of the octagonal side L 2 . The second ridgeline portion R 2  is disposed so as to face the first ridgeline portion R 1  (see  FIG.  3   ) of the tooth adapter  3  (the connecting portion  27 ). 
     Also, a fourth ridgeline portion R 4  is formed on an inner surface of the third portion  39  by a corner portion adjacent to the end portion of the side L 2 . The fourth ridgeline portion R 4  is disposed so as to face the third ridgeline portion R 3  (see  FIG.  3   ) of the tooth adapter  3 . 
     As shown in  FIGS.  5 B (b),  5 B(c), and  5 B(d), the side L 4  adjacent to the side L 2  of the third portion  39  is a side of an octagonal inner circumference of the third portion  39 . The side L 4  forms a surface between the second ridgeline portion R 2  and the fourth ridgeline portion R 4 . 
     As shown in  FIGS.  5 B (b),  5 B(c), and  5 B(d), a length of the side L 2  at a center portion of the third portion  39  in the longitudinal direction (the length of the side L 2  in  FIG.  5 B (c)) is shorter than a length of the side L 2  on the second portion  37  side on the third portion  39  (the length of the side L 2  in  FIG.  5 B (d)). Also, a length of the side L 2  at the center portion of the third portion  39  in the longitudinal direction (the length of the side L 2  in  FIG.  5 B (c)) is shorter than a length of the side L 2  on the first portion  35  side on the third portion  39  (the length of the side L 2  in  FIG.  5 B (b)). 
     Specifically, as shown in  FIG.  6   , the side L 2  gradually becomes shorter from the second portion  37  toward the center portion of the third portion  39  (see  FIGS.  5 B (d) and  5 B(c)). Also, the side L 2  gradually becomes longer from the center portion of the third portion  39  toward the first portion  35  (see  FIGS.  5 B (c) and  5 B(b)). 
     As shown in  FIGS.  5 B (b),  5 B(c), and  5 B(d), the length of the side L 4  of the center portion of the third portion  39  in the longitudinal direction (the length of the side L 4  in  FIG.  5 B (c)) is longer than a length of the side L 4  on the second portion  37  side on the third portion  39  (the length of the side L 4  in  FIG.  5 B (d)). Also, a length of the side L 4  at the center portion of the third portion  39  in the longitudinal direction (the length of the side L 4  in  FIG.  5 B (c)) is longer than a length of the side L 4  on the first portion  35  side on the third portion  39  (the length of the side L 4  in  FIG.  5 B (b). 
     Specifically, as shown in  FIG.  6   , the side L 4  gradually becomes longer from the second portion  37  toward the center portion of the third portion  39  (see  FIGS.  5 B (d) and  5 B(c)). Also, the side L 4  gradually becomes shorter from the center portion of the third portion  39  toward the first portion  35  (see  FIGS.  5 B (c) and  5 B(b)). 
     The tooth  5  can be positioned with respect to the tooth adapter  3  by forming the second ridgeline portion R 2  and the fourth ridgeline portion R 4  on the inner surface of the tooth  5  and forming the first ridgeline portion R 1  and the third ridgeline portion R 3  on the tooth adapter  3 . In other words, it is possible to suppress a backlash of the tooth  5  with respect to the tooth adapter  3 . 
     (Pin Member) 
     As shown in  FIG.  2   , the pin member  7  connects the tooth adapter  3  and the tooth  5 . The pin member  7  is disposed in the first pin hole  13  and the second pin hole  33 . The pin member  7  is formed in a columnar shape. The pin member  7  can be formed in a cylindrical shape. The pin member  7  includes the axis center A 2 . 
     For example, as shown in  FIG.  4 C , the pin member  7  is disposed in the first pin hole  13  and the second pin hole  33  in a state where the tip portion  23  of the nose portion  21  contacts with the inner surface of the tooth adapter  3 . In this state, the pin member  7  contacts with an inner peripheral surface of the first pin hole  13  on the tip portion  23  side of the nose portion  21 . Also, the pin member  7  contacts with an inner peripheral surface of the second pin hole  33  on the base end portion  25  side of the nose portion  21 . In this state, the axis center A 2  is offset from a center C 1  of the center portion  13   a  and a center C 2  of the end portion  13   b  of the first pin hole  13  toward the tip portion  23  side of the nose portion  21 . 
     The pin member  7  includes an annular groove  7   a . The annular groove  7   a  is formed on an outer peripheral surface of the pin member  7 . The annular groove  7   a  is disposed between the tooth adapter  3  and the tooth  5 . The lock member  9  engages with the annular groove  7   a . Specifically, an engaging portion  41   a  (described later) of the lock member  9  engages with the annular groove  7   a.    
     With this configuration, a gap is formed between the pin member  7  and the first pin hole  13  on the base end portion  25  side of the nose portion  21 , in a state where the pin member  7  is disposed in the first pin hole  13  of the tooth adapter  3  and the second pin hole  33  of the tooth  5 . This gap regulates so that the pin member  7  don&#39;t contact with a portion of the base end portion  25  side of the first pin hole  13  during an excavating work and a penetrating work with the bucket  2 . Thereby, a durability of the pin member  7  and the first pin hole  13  can be improved. 
     (Lock Member) 
     The lock member  9  is used for locking the pin member  7 . As shown in  FIG.  7 A , the lock member  9  engages with the pin member  7  by sliding toward the pin member  7 . Specifically, the lock member  9  engages with the pin member  7  by sliding in a direction toward the pin member  7 . More specifically, the lock member  9  engages with the pin member  7  by sliding in a direction from the bucket  2  toward the pin member  7 . 
     The lock member  9  is disposed between the tooth adapter  3  and the tooth  5 . Specifically, the lock member  9  is disposed between an outer surface of the adapter body  11  and the inner surface of the tooth body  29 . The lock member  9  is disposed in the guide groove  31  (see  FIG.  8 A ). The lock member  9  includes a lock body  41  and a claw portion  43 . 
     For example the lock body  41  is a rectangular plate-shaped member. The lock body  41  includes the engaging portion  41   a  and an opening portion  41   b . The engaging portion  41   a  is a portion that engages with the pin member  7 . The engaging portion  41   a  includes a C-shaped inner peripheral surface. The engaging portion  41   a  is fitted into the annular groove  7   a  of the pin member  7 . The opening portion  41   b  is a portion that guides the pin member  7  toward the engaging portion  41   a . A distance between opening ends in the opening portion  41   b  is larger than the diameter of the annular groove  7   a  of the pin member  7 . 
     As shown in  FIG.  7 A , the claw portion  43  is a portion which protrudes from the lock body  41 . For example, the claw portion  43  is formed integrally with the lock body  41 . As shown in  FIG.  7 B , the claw portion  43  is disposed in the recess portion  15  of the tooth adapter  3 . 
     The lock member  9  is mounted as follows. First, the lock member  9  is disposed on the tooth adapter  3 . For example, the lock body  41  is disposed on the outer surface of the adapter body  11 . Specifically, the opening portion  41   b  is disposed at the position of the first pin hole  13  of the adapter body  11 . The claw portion  43  is disposed in the recess portion  15  of the adapter body  11 . 
     Next, the tooth  5  is mounted to the tooth adapter  3 . After that, the pin member  7  is inserted into the second pin hole  33  of the tooth body  29  and the first pin hole  13  of the adapter body  11 . The annular groove  7   a  of the pin member  7  is disposed so as to face the opening portion  41   b  of the lock body  41  (see  FIG.  8 A ). This state is a state where the lock member  9  and the pin member  7  are disengaged (an unlocked state). 
     In this unlocked state, the claw portion  43  is pressed toward the pin member  7 . Thereby, the lock body  41  slides toward the pin member  7 , and the engaging portion  41   a  of the lock body  41  fits into the annular groove  7   a  of the pin member  7  (see  FIG.  8 B ). This state is a state where the lock member  9  and the pin member  7  are engaged (a locked state). 
     In this way, the pin member  7  is locked by sliding the lock member  9  toward the pin member  7  in the unlocked state. Also, the pin member  7  is unlocked by sliding the lock member  9  in the direction away from the pin member  7  in the locked state. 
     (Variation A) 
     In the above embodiment, an example is shown in which the lock member  9  engages with the pin member  7  by sliding in the direction from the bucket  2  toward the pin member  7 . Instead of this configuration, a tooth attachment structure  101  can be configured as shown in  FIGS.  9 A and  9 B . The configuration whose description is omitted here is the same as the configuration of the above embodiment. 
     In this case, as shown in  FIGS.  9 A and  9 B , a lock member  109  engages with the pin member  7  by sliding in the direction away from the pin member  7 . For example, the lock member  109  engages with the pin member  7  by sliding in the direction from the pin member  7  toward the bucket  2 . The lock member  109  includes a lock body  141  and the claw portion  43 . The configuration of the claw portion  43  is the same as the configuration of the above embodiment. 
     As shown in  FIG.  9 C , for example, the lock body  141  is formed in a rectangular plate shape. The lock body  141  includes an engaging portion  141   a  and an opening portion  141   b . The engaging portion  141   a  is a portion that engages with the pin member  7 . The engaging portion  141   a  includes a C-shaped inner peripheral surface. The engaging portion  141   a  is fitted into the annular groove  7   a  of the pin member  7 . 
     The opening portion  141   b  is a portion where the pin member  7  is disposed before the pin member  7  is engaged with the engaging portion  141   a . The opening portion  141   b  is provided between the engaging portion  141   a  and the claw portion  43 . The opening portion  141   b  includes a C-shaped inner peripheral surface. A diameter of the opening portion  141   b  is larger than the diameter of the pin member  7 . 
     The lock member  109  is mounted as follows. First, the lock member  109  is disposed on the tooth adapter  3 . For example, the lock body  141  is disposed on the outer surface of the adapter body  11 . The opening portion  141   b  is disposed at the position of the first pin hole  13  of the adapter body  11 . 
     Next, the tooth  5  is mounted to the tooth adapter  3 . After that, the pin member  7  is inserted into the second pin hole  33  of the tooth body  29 , the opening portion  141   b  of the lock member  109 , and the first pin hole  13  of the adapter body  11 . The annular groove  7   a  of the pin member  7  is disposed so as to face the opening portion  141   b  of the lock body  41  (see  FIG.  9 A ). This state is a state where the lock member  109  and the pin member  7  are disengaged (the unlocked state). 
     In this unlocked state, the claw portion  43  is pressed toward the bucket  2 . Thereby, the lock body  141  slides in a direction away from the pin member  7 . As a result, the engaging portion  141   a  of the lock body  141  fits into the annular groove  7   a  of the pin member  7  (see  FIG.  9 B ). This state is a state where the lock member  109  and the pin member  7  are engaged (the locked state). 
     In this way, the pin member  7  is locked by sliding the lock member  9  in the direction away from the pin member  7  in the unlocked state. Also, the pin member  7  is unlocked by sliding the lock member  9  in the direction toward the pin member  7  in the locked state. 
     (Variation B) 
     In the above embodiment, an example is shown in which the inner peripheral surface of the first pin hole  13  is expanded in diameter (see  FIGS.  4 B and  4 C ). Instead of this configuration, as shown in  FIGS.  10 A and  10 B , an inner peripheral surface of a first pin hole  113  can be formed with a non-expanded diameter. The configuration whose description is omitted here is the same as the configuration of the above-described embodiment. 
     In this case, for example, as shown in  FIGS.  10 A and  10 B , the inner peripheral surface of the first pin hole  113  is formed in an elongated hole shape. As shown in  FIG.  10 B , a first inner peripheral surface  113   a  of the first pin hole  113 , which is formed on the tip portion  23  side of the nose portion  21 , is formed in an arc shape. A radius forming the first inner peripheral surface  113   a  is larger than a radius of the pin member  7 . 
     A second inner peripheral surface  113   b  of the first pin hole  113 , which is formed on the base end portion  25  side of the nose portion  21 , is formed in an arc shape. A radius forming the second inner peripheral surface  113   b  is larger than a radius of the pin member  7 . A distance (a major axis) between the first inner peripheral surface  113   a  and the second inner peripheral surface  113   b  is larger than the diameter of the pin member  7 . 
     A pair of third inner peripheral surfaces  113   c , which is formed between the first inner peripheral surface  113   a  and the second inner peripheral surface  113   b , is formed in a planar shape. The distance (a minor axis) of the pair of third inner peripheral surfaces  113   c  is larger than the diameter of the pin member  7 . 
     In this case, as shown in  FIG.  10 A , the pin member  7  is disposed in the first pin hole  113  and the second pin hole  33  in a state where the tip portion  23  of the nose portion  21  contacts with the inner surface of the tooth adapter  3 . In this state, the pin member  7  contacts with an first inner peripheral surface  113   a  of the first pin hole  113  on the tip portion  23  side of the nose portion  21 . Also, the pin member  7  contacts with the inner peripheral surface of the second pin hole  33  on the base end portion  25  side of the nose portion  21 . In this state, the axis center A 2  is offset from a center C 3  of the first pin hole  113  toward the tip portion  23  side of the nose portion  21 . The center C 3  of the first pin hole  113  is an intersection of the major axis and the minor axis. 
     With this configuration, a gap is formed between the pin member  7  and the first pin hole  113  on the base end portion  25  side of the nose portion  21 , in a state where the pin member  7  is disposed in the first pin hole  113  of the tooth adapter  3  and the second pin hole  33  of the tooth  5 . This gap regulates so that the pin member  7  don&#39;t contact with a portion of the base end portion  25  side of the first pin hole  113  during an excavating work and a penetrating work with the bucket  2 . Thereby, a durability of the pin member  7  and the first pin hole  113  can be improved. 
     Here, an example is shown in which the inner peripheral surface of the first pin hole  113  is formed by the first inner peripheral surface  113   a , the second inner peripheral surface  113   b , and the third inner peripheral surfaces  113   c . The inner peripheral surface of the first pin hole  113  can be formed in any shape as long as the inner peripheral surface of the first pin hole  113  includes the elongated hole shape. 
     In the tooth attachment structure  1  and  101 , the pin member  7  is mounted on the tooth  5  and the tooth adapter  3  in the unlocked state. Thereby, the pin member  7  can be easily mounted to the tooth  5  and the tooth adapter  3 . Also, the pin member  7  is locked by the lock members  9  and  109  by sliding the lock members  9  and  109  in the unlocked state. Thereby, the tooth  5  can be easily mounted to the tooth adapter  3  by the lock members  9  and  109  and the pin member  7 . 
     On the other hand, the pin member  7  is unlocked by sliding the lock members  9  and  109  in the locked state. Thereby, the pin member  7  can be easily removed from the tooth  5  and the tooth adapter  3 . Also, the tooth  5  can be easily removed from the tooth adapter  3 . 
     As described above, in the tooth attachment structure  1  and  101 , the tooth  5  can be easily mounted to and dismounted from the tooth adapter  3 . 
     Although one embodiment of the present invention is described, the present invention is not limited to the above embodiment, and various variations can be made without departing from the scope of the invention. 
     In the above embodiment, a case is shown where the tooth attachment structure  1  and  101  is applied to the bucket  2 . The tooth attachment structure  1  and  109  can be applied to a structure different from the bucket  2 . For example, the tooth attachment structure  1  and  109  can be applied not only to the bucket  2  but also to a bucket shroud, a ripper point, and the like. 
     In the above embodiment, an example is shown in which the diameter of the first pin hole  13  is expanded. The first pin hole  13  is formed with the same diameter in an axial direction in which the axis center A 2  of the pin member  7  extends. 
     In the above embodiment, an example is shown in which the tooth attachment structure  1  and  109  for the bucket  2  does not include a configuration for positioning the lock member  9 . As shown in  FIGS.  11 A and  11 B , the tooth attachment structure  1  and  109  for the bucket  2  can includes a configuration for positioning the lock member  9 . 
     In this case, for example, the tooth adapter  3  further includes protrusions  17  and  18 . The protrusions  17  and  18  are provided on the outer surface of the tooth adapter  3 . For example, the protrusions  17  and  18  are formed on the outer surface of the nose portion  21 . 
     The protrusion  17  of  FIG.  11 A  supports the lock member  9 , for example, the lock body  41  in the unlocked state. In a state where the tooth  5  is disposed on the tooth adapter  3 , the protrusion  17  is disposed in the guide groove  31  of the tooth  5 . The lock member  9  can be easily positioned with respect to the tooth adapter  3  by providing the protrusion  17  on the tooth adapter  3 . 
     The protrusion  18  of  FIG.  11 B  engages with a lock member  9 , for example, a lock body  41  in the locked state. In a state where the tooth  5  is disposed in the tooth adapter  3 , the protrusion  18  is disposed in the guide groove  31  of the tooth  5 . The lock member  9  can be easily positioned with respect to the tooth adapter  3  by providing the protrusion  18  on the tooth adapter  3 . The tooth attachment structure  1  and  109  for the bucket  2  can include both configurations of  FIGS.  11 A and  11 B . 
     According to the present invention, a tooth can be easily mounted and dismounted. 
     Tooth Attachment Structure