JP2729785B2 - Connection structure of blade and handle in excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure between a blade and a handle of a shovel.

[0002]

2. Description of the Related Art In general, a connection between a blade and a handle constituting a shovel is formed by integrally forming a connection cylindrical portion at one end of the blade, and one end in the length direction of the handle is closely fitted to the connection cylindrical portion. However, in the above shovel, the connecting tubular portion is formed in a substantially C-shaped cross section, and the outer peripheral wall of the connecting tubular portion is opened on one side without being continuous in the circumferential direction. From that
When a predetermined load is applied to the handle during use of the shovel or the like, the opening of the connecting tubular portion may expand, and the handle may be detached from the connecting tubular portion.

Conventionally, in the above-mentioned shovel, through holes B1 and B2 are formed on both sides in the longitudinal direction of the connecting tubular portion A provided on the blade F, as schematically shown in FIGS. And a through hole D1 communicating with each of the through holes B1 and B2 is formed at one end of the handle C in the length direction.
D2 is formed, and the through holes B1 and B2 through through hole D1 are formed.
· By inserting rivets E1 · E2 into D2, the handle C is fixed to the connecting tubular portion A via the rivets E1 · E2, and the free end side of the connecting tubular portion A has a so-called opening. It does not happen.

[0004]

However, in the above-mentioned structure, since the through holes D1 and D2 are formed in the handle C, the through-holes D1 and D2 are formed in the connecting cylindrical portion A of the blade F with, for example, excavation of the road surface. On the other hand, when a predetermined load is applied to the handle C, the load acts intensively on the through-hole D1 forming portion of the handle C via the rivet E1, and the handle C is possibly damaged at the through-hole D1 forming portion. There is a problem to do.

The present invention has been developed in view of the above circumstances, and it is an object of the present invention to provide a handle that is excellent in assemblability to a blade, and that the rigidity of a connecting portion between the blade and the handle is sufficiently increased. To provide a connection structure between the blade and the handle.

[0006]

In order to achieve the above-mentioned object, according to the present invention, one end in the longitudinal direction of the handle 2 is inserted into a connecting cylindrical portion 3 provided on the blade 1 and having a substantially C-shaped cross section. In the fixed shovel, a substantially cylindrical reinforcing tube 5 is inserted into the outer peripheral surface of the connecting tubular portion 3 while one end of the handle 2 is pressed into the connecting tubular portion 3. The handle 2 is fixed to the connecting tubular portion 3, and the connecting tubular portion 3 is
It is characterized in that it is closely fitted to.

[0007]

According to the present invention, since the reinforcing tube 5 is closely fitted to the outer peripheral surface of the free end portion of the connecting tubular portion 3, the connecting tubular portion 3 of the blade 1 is connected to the connecting tubular portion 3. Even if a large load is applied to the handle 2 press-fitted into the 3, the free end side of the connecting tubular portion 3 prevents the mouth from being opened by the reinforcing tube 5.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The shovel shown in FIG. 1 basically comprises a blade 1 made of a thin steel plate and a wooden handle 2 having a circular cross section to be joined to the blade 1. A connecting tubular portion 3 having a C-shaped cross section is integrally protruded rearward from the center of the blade 1, and a circular through hole 31 is formed at the base side of the connecting tubular portion 3. .

As shown in FIG. 3 or FIG. 4, the outer diameter of the connecting tubular portion 3 is gradually increased from the base portion toward the distal end, and the outer peripheral surface of the connecting tubular portion 3 is formed. It has a tapered surface.

On the other hand, at one end of the handle 2 in the longitudinal direction, a connecting shaft 20 having a diameter slightly smaller than the general cross section of the handle 2 is provided. While forming a circular through hole 21 that can communicate, a grip 4 separately formed is attached to the other end of the handle 2 in the longitudinal direction.

The connecting shaft portion 20 is tapered toward the tip.

In the above construction, according to the present invention, the cylindrical reinforcing tube 5 is formed separately from a metal material. In the embodiment shown in the drawing, the reinforcing tube 5 is connected to its shaft as shown in FIG. The diameter is gradually increased from one end side opening to the other end side opening so that it can be loosely inserted into the outer periphery of the connection cylindrical portion 3 and the other end side opening edge of the reinforcing cylinder 5 is radially inside. It is curved toward.

The reinforcing cylinder 5 is connected to the connecting cylindrical portion 3
After loosely inserting the outer periphery of the distal end of the shaft, the connecting shaft 20 of the handle 2 is press-fitted into the connecting tubular portion 3 to fix the handle 2 to the connecting tubular portion 3 and to connect the connecting shaft. Due to the expansion of the diameter of the connecting tubular portion 3 accompanying the press-fitting of 20, the connecting tubular portion 3 is closely fitted to the reinforcing tube 5 and the outer peripheral wall of the reinforcing tube 5 is squeezed in the diameter reducing direction. The reinforcing tube 5 is fixed to the connecting tubular portion 3, and the rivet 6 is inserted into the through-hole 31 through the through-hole 21 and both ends thereof are caulked to thereby form the reinforcing tube 5 and the rivet 6. The coupling strength of the handle 2 to the connecting tubular portion 3 is increased through
The handle 2 is prevented from rotating or coming off with respect to the connecting tubular portion 3 through the opening.

Thus, in the above-mentioned shovel, since the reinforcing cylinder 5 is tightly fitted to the outer peripheral surface of the free end of the connecting tubular portion 3, the blade 1 can be used, for example, when excavating a road surface. Even if a large load is applied to the connecting tubular portion 3 of the handle 2 and the connecting shaft portion 20 of the handle 2, the free end side of the connecting tubular portion 3 does not have a possibility of opening the mouth, and the connecting shaft portion 20 of the handle 2 is broken. There is little fear.

Since the opening at the other end of the reinforcing cylinder 5 is curved radially inward, the edge 50 at the opening at the other end of the reinforcing cylinder 5 accompanies the fixing to the connecting tubular portion 3. But FIG.
As shown in FIG. 5, the edge 50 does not come into contact with the proximal end step 20a of the connection shaft 20 and is exposed to the outside.

In the above embodiment, the connecting tubular portion 3 is
The outer diameter of the connecting cylindrical portion 3 is tapered while gradually increasing its outer diameter from the base toward the distal end, but may be formed straight.

In the above embodiment, the connecting shaft 20 having a diameter slightly smaller than the general cross section of the handle 2 is provided at one end of the handle 2 in the longitudinal direction. The diameter may be the same as the outer diameter of the handle 2, or the connecting shaft portion 20 may be formed straight to taper toward the tip.

In the above embodiment, the diameter of the reinforcing cylinder 5 is gradually increased from one axial opening to the other axial opening so that the reinforcing cylinder 5 can be freely inserted into the outer periphery of the connecting cylindrical portion 3. At the same time, the opening edge of the other end side of the reinforcing cylinder 5 is curved inward in the radial direction. However, the present invention is not limited to this. For example, the reinforcing cylinder 5 may be formed in a straight cylindrical shape.

In the above embodiment, the connecting cylindrical portion 3
A through hole 31 is provided on the base end side of the
1 was formed, and the rivet 6 was inserted into the through holes 31 to 21. For example, as shown in FIG.
Even if the opening of one side of the outer peripheral wall of the connecting tubular portion 3 indicated by reference symbol S in FIG. 3 is fixed by welding without employing the connecting structure of the connecting tubular portion 3 and the handle 2 by the rivet 6. Good.

In this case, a notch 32 is formed in advance at the free end of the connecting tubular portion 3, and as shown in FIG. Is partially recessed radially inward, and the notch 32 is connected to the connection shaft 2.
It is preferable that the handle 2 is prevented from turning or coming off from the connecting tubular portion 3 by being bitten into the inside.

[0021]

As described above, according to the present invention, the substantially cylindrical reinforcing tube 5 is inserted into the outer peripheral surface of the connecting cylindrical portion 3 provided on the blade 1 and having a substantially C-shaped cross section. By press-fitting one end portion into the connecting tubular portion 3 to fix the handle 2 to the connecting tubular portion 3 and tightly fitting the connecting tubular portion 3 to the reinforcing tube 5, for example, At the time of digging a road surface, for example, the connecting cylindrical portion 3 of the blade 1 and the connecting shaft portion 2 of the handle 2
Even if a large load is applied to the connecting tube 3, the reinforcing tube 5 closely fitted to the outer periphery of the connecting tube 3 prevents the free end side of the connecting tube 3 from opening its mouth. It is possible, but nevertheless, there is no need to form a through-hole in the handle 2 or the number of through-holes can be reduced, so that the risk of the handle 2 being broken carelessly is reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a shovel employing a connection structure of the present invention.

FIG. 2 is an enlarged sectional view of a reinforcing cylinder used in the connection structure of the present invention.

FIG. 3 is an enlarged rear view showing a main part of the shovel employing the connection structure of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a main part of a shovel employing the connection structure of the present invention.

FIG. 5 is a rear view of a main part of a shovel showing another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part of a shovel showing another embodiment of the present invention.

FIG. 7 is a rear view of a main part of a conventional shovel.

FIG. 8 is a sectional view of a main part of a conventional shovel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blade 2 Handle 3 Connecting cylindrical part 5 Reinforcement cylinder

Claims (1)

(57) [Claims] An excavator in which a longitudinal end of a handle (2) is inserted and fixed to a connecting cylindrical portion (3) having a substantially C-shaped cross section provided on a blade (1). A substantially cylindrical reinforcing tube (5) is inserted into the outer peripheral surface of the cylindrical portion (3), and one end of the handle (2) is press-fitted into the connecting tubular portion (3). 2) A connecting structure of a blade and a handle in a shovel, wherein 2) is fixed to the connecting tubular portion (3), and the connecting tubular portion (3) is closely fitted to the reinforcing tube (5).