JP2005320758A - Shovel scoop - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shovel scoop which achieves weight reduction. <P>SOLUTION: According to the structure of the shovel 1, a handle 2, a grip connection body 3, and a grip 4 are molded of aluminum, and they are aluminum-welded to each other in one body. Then a front end of the handle 2 formed of an aluminum cylinder is squeezed into a tapered shape as a fitting portion 2a by swaging, drawing, press working, etc., which is then fitted into an insertion portion 5a of a spoon body 5, and the insertion portion and the fitting portion are clamped together by a rivet 6 while ensuring the strength at a joint portion. In this manner the aluminum handle 2 and the steel spoon body 5 which cannot be welded together, can be rigidly connected together, and the shovel using aluminum is realized, to thereby achieve weight reduction of the shovel scoop. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an excavator scoop used for civil engineering work or gardening work.

Excavator scoops used for civil engineering work are heat-treated steel because the frame requires wear resistance. On the other hand, the handle to which the frame is attached is made of wood or steel pipe, but in recent years, steel pipes are often used. Joined by welding.
Shokai Sho 55-21382

  However, the conventional shovel and scoop having a handle made of wood or steel pipe has a certain weight, and the demand for weight reduction is increasing in order to improve workability.

  In view of the above points, an object of the present invention is to provide an excavator scoop that is reduced in weight.

  In order to solve the above-mentioned problems, the present inventor pays attention to the fact that the weight can be reduced while maintaining the strength by using an aluminum material that has not been used for the handle, and the steel flange portion and the aluminum. Although it was impossible to weld the handle of the material, it was considered possible to join the handle of the steel and the handle of the aluminum by using the good formability of the aluminum material. That is, the shovel scoop according to claim 1 of the present invention includes a steel case subjected to heat treatment, a rod-like handle to which the case is attached, a grip coupling body and a handle to be attached to the handle. In the excavator scoop, the handle, the grip coupling body, and the grip are each formed of an aluminum material, and the handle, the grip coupling body, and the grip are each joined by aluminum welding, and the tip of the handle made of an aluminum tube is used. It is characterized in that the side is tapered to form a fitting portion that fits into the insertion portion of the housing, the fitting portion of the handle is inserted into the insertion portion of the housing, and is joined by a fastener such as a rivet. It is said.

  The shovel scoop according to claim 2 is characterized in that the fitting portion on the distal end side of the handle is drawn into a tapered shape by any one of swaging, drawing, and pressing.

  As described above, according to the shovel scoop according to the first aspect of the present invention, the handle, the grip coupling body, and the grip are each formed of an aluminum material, and the handle, the grip coupling body, and the grip are each made of aluminum welding. And forming a fitting portion to be fitted into the insertion portion of the housing by narrowing the tip end side of the handle made of an aluminum tube into a tapered shape, and inserting the insertion portion of the handle into the insertion portion of the housing. Since it is joined with fasteners such as rivets, the use of aluminum material can be lighter and easier to handle than conventional wooden or steel pipe handle shovels and scoops. In addition, it is possible to realize an excavator scoop using aluminum material by firmly joining an aluminum handle that cannot be welded due to different materials and a steel collar.

  Further, according to the shovel scoop according to claim 2, the fitting portion on the distal end side of the handle is drawn into a tapered shape by any one of swaging, drawing, and pressing, so that the aluminum handle can be easily formed. It can be drawn, and it is clean and can maintain its strength.

  According to the shovel scoop according to claim 1 of the present invention, the handle, the grip coupling body, and the grip are formed of a light aluminum material, and the handle, the grip coupling body, and the grip are integrally formed by aluminum welding. To join. Also, because the steel case and the aluminum handle are made of different materials, it is impossible to abut the case and weld it together like the conventional steel handle. The tip side is gradually reduced in diameter and is tapered so that it can be inserted into the insertion part of the housing. And the insertion part of the shape | molded handle is inserted in a housing insertion part, and it fastens and joins with fasteners, such as a rivet and a screw.

  Thus, since the handle, the grip coupling body, and the grip are made of aluminum and made of the same material, they can be integrally joined by aluminum welding. In addition, the joining of the aluminum handle and the steel frame is impossible due to the different materials, but the tip of the aluminum handle is tapered to form the fitting part. Thus, the fitting part can be firmly joined by fitting the fitting part into the housing insertion part and fastening with a fastener such as a rivet or a screw while maintaining the strength of the joint part. Joining with the body can be realized, and the weight of the shovel and scoop can be reduced. In addition, although it is expected to rattle in fastening with rivets etc., if the handle insertion part and the case insertion part are accurately formed, and the handle insertion part is press-fitted into the case insertion part and firmly inserted, The frictional force at the contact surface between the housing insertion portion and the handle insertion portion acts strongly against the rotational force around the handle axis and does not rattle. In addition, it is pressed from both sides of the housing insertion part and pressed against the handle insertion part to reduce the diameter, and in that state, welding is applied to the gap on the back side of the housing insertion part to shrink the housing insertion part. If the diameter is kept as it is, there is no more rattling.

  According to the shovel scoop according to claim 2, the fitting portion on the distal end side of the handle is formed while being squeezed into a taper shape by any one of a swaging process by a swaging machine, a drawing process, or a press process. At this time, if it is swaging processing, preferably, the tip opening is formed so as to be substantially closed.

  In this way, when forming the fitting portion of the handle into the housing, either a swaging process, a drawing process, or a press process was used, so that an aluminum tube with good formability was closely attached to the housing insertion part. Can be easily molded into a shape to be fitted, and if the fitted part of the shaped handle is fitted into the case insertion part and fastened and fixed with a rivet or the like, the strength of the joint part between the handle and the case can be sufficiently maintained. . In addition, it is preferable to round the opening at the end of the fitting portion of the handle by swaging so that foreign matter such as earth and sand does not enter the handle when the shovel is used.

  Embodiments of the present invention will be described below with reference to the drawings.

  Reference numeral 1 in the figure denotes an excavator according to the present invention, which includes a handle 2, a grip coupling body 3, a grip 4, and a housing 5. The handle 2 has a pipe shape made of an aluminum material as shown in FIG. 2, and the tip side of the handle 2 is gradually reduced in diameter toward the tip as shown in FIG. Thus, the insertion portion 2a that can be fitted into the insertion portion 5a of the housing 5 and is in close contact with the inner wall surface of the insertion portion 5a is formed.

  If swaging is performed by a swaging machine, the fitting portion 2a of the handle 2 can be machined so that the tip end portion is rounded into a substantially hemispherical shape and the pipe tip opening is substantially closed as shown in FIG. Sometimes it is possible to prevent foreign matter such as earth and sand from entering the handle 2 and to improve its appearance. Further, a through hole 7 for inserting a rivet 6 for fastening the housing 5 is formed in a side portion on the distal end side of the handle 2. In place of the fastening rivet 6, for example, a fastener such as a screw or a bolt can be used. Further, the other end portion of the handle 2 is formed with a joint portion 2b for being fitted into the grip coupling body 3 and joined by press working.

  The grip coupling body 3 and the grip 4 are also formed of an aluminum material in the same manner as the handle 2, and the grip coupling body 3, the grip 4, and the grip 2 can be integrally joined by aluminum welding. The housing 5 is made of heat-treated steel for wear resistance, and has an insertion portion 5a for inserting the insertion portion 2a of the handle 2. The rivet 6 is inserted into the insertion tube 5a. A through-hole 8 is provided for the purpose.

  When the handle 2, the grip coupling body 3, the grip 4, and the housing 5 are integrally joined to form an excavator, as shown in FIG. 2, first, the grip coupling body 3 formed of the same aluminum material is used. The grip 4 is integrally joined by aluminum welding. Next, the integrated grip portion is fitted into the connecting portion 2b of the handle 2 which is also formed from an aluminum material, and is integrally joined by aluminum welding. Next, after the insertion part 2a formed by drawing at the front end side of the handle 2 is inserted into the insertion part 5a of the housing 5, it is fastened and joined by the rivet 6.

  In this way, the handle 2, the grip coupling body 3, and the grip 4 are integrally joined by aluminum welding, and the steel housing 5 made of different materials is formed by narrowing the tip end portion of the handle 2 in a tapered shape. The fitting portion 2a is inserted into the insertion portion 5a of the housing 5 and integrally joined with the rivet 6 while maintaining a sufficient strength of the joining portion, so that a lightweight excavator using an aluminum material is formed. Can be realized.

  4 and 5 show an embodiment in which the fitting portion 2a of the handle 2 is formed by press working instead of swaging, and in FIG. And the tapered fitting portion 2a is formed at the distal end portion of the handle 2. In FIG. 5, the side surface of the distal end portion of the handle 2 is pressed from four directions to form the tapered fitting portion 2a. Is formed. In addition to these press workings, the tapered fitting portion 2a can be formed by drawing the tip portion of the handle 2 as well. This press working or drawing work has the advantage that it can be formed at a lower cost than swaging.

  In addition, when joining the handle insertion part 2a and the case insertion part 5a with the rivet 6, it is also expected that rattling occurs, but the handle insertion part 2a and the case insertion part 5a are accurately formed. If the handle insertion portion 2a is press-fitted into the case insertion portion 5a and firmly inserted, the friction at the contact surface between the case insertion portion 5a and the handle insertion portion 2a against the rotational force around the axis of the handle 2 The force can act strongly to prevent rattling. Further, the pressure is applied from both side surfaces of the housing insertion portion 5a to strongly press the handle insertion portion 2a to reduce the diameter, and welding is performed to the gap portion on the back side of the housing insertion portion 5a to insert the housing. If the portion 5a is held with a reduced diameter, there is no further backlash. In addition, when forming the handle insertion portion 2a by swaging, if the surface of the handle insertion portion 2a is not formed smoothly but is formed roughly to form some uneven portions (streaks), the casing If it press-fits strongly at the time of insertion in the insertion part 5a, the convex part will collapse and it will be firmly fixed to the housing insertion part 5a, and shakiness will be lost.

It is a front view of the shovel which concerns on this invention. It is a figure explaining the assembly procedure of the shovel which concerns on this invention. It is (a) longitudinal cross-sectional view, (b) AA end elevation, (c) BB end elevation of the fitting part of a handle. It is (a) longitudinal cross-sectional view, (b) CC end elevation, (c) DD end elevation of the fitting part of the handle in another Example. It is (a) longitudinal cross-sectional view, (b) EE end elevation, (c) FF end elevation of the fitting part of the handle in another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Excavator 2 ... Handle 2a ... Insertion part 3 ... Grip coupling body 4 ... Grip 5 ... Housing 5a ... Insertion part 6 ... Rivet (fastener)

Claims (2)

  An excavator scoop comprising a heat-treated steel case, a rod-like handle to which the case is attached, a grip connection body and a handle attached to the handle, the handle, the handle connection body, and the grip Each is made of aluminum material, and the handle, grip coupling body, and grip are joined by aluminum welding, and the tip end side of the handle made of an aluminum tube is squeezed into a tapered shape and fitted into the insertion part of the housing. An excavator scoop characterized in that the part is formed, the fitting part of the handle is inserted into the insertion part of the housing, and is joined by a fastener such as a rivet.   The shovel scoop according to claim 1, wherein the fitting portion on the distal end side of the handle is formed into a tapered shape by any one of swaging, drawing, and pressing.

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