JPS59170331A - Manual tool - Google Patents

Abstract

PURPOSE:To obtain a scoop having a strong handle lever and strong connections by a method in which a large-diameter portion and a small-diameter portion are provided on the scoop side of the handle lever, a small-diameter cylinder and an upwardly inclined projection piece are provided on the handle lever side of the scoop, and the small-diameter portion and projection piece of the scoop are inserted into the handle lever and combined with a presser piece. CONSTITUTION:In the direct connection between a scoop 1 and a tubular handle lever 2, an expanded portion 20 and a cylindrical projection piece of a smaller diameter than the expanded portion 20 are projectionally provided near the scoop side of the handle lever 2. On the other hand, a small-diameter cylindrical portion 10 and a slantly and upwardly extending portion 11 following the cylindrical portion 10 are projectionally provided on the handle lever side of the scoop 1. The extending portion 11 and the cylindrical portion 10 of the scoop 1 are inserted into the projection piece of the handle lever 2, and then the presser piece 3 is pressed into the cylindrical portion 10 and the extending portion 11. The handle lever having a high strength can be obtained by using the small- diameter handle tube and the connecting operation of them can be made easily and quickly.

Description

[Detailed description of the invention]

The present invention relates to a hand tool such as a shovel or a shovel, and more particularly to a two-hand tool consisting of a blade and a tubular grip lever.In general, a hand tool has a blade connected to a grip rod, and the distal end portion of the blade. When working by inserting the blade into a workpiece such as earth and sand, and operating the grip body provided at the rear of the gripping handle to lift the workpiece with the blade,
The heavier the object to be worked near where the tip of the blade enters, the more firmly the tip of the blade will be supported by the object, and when the grip body is operated, the connection position of the grip rod with the blade will be lowered. A large bending stress is intensively applied to the For this reason, conventionally, the blade mounting tubes are arranged at the end of the gripping handle so as to butt each other, and reinforcing bodies are inserted and reinforced on both sides of the butt, or the end of the gripping handle is reinforced. The mounting tubes for the internal blades are stacked internally, and a reinforcing body is inserted into the mounting tubes to provide reinforcement. The proximal portion of the rod that is continuous with the connection position with the blade comes into pressure contact with the proximal end of the reinforcing body or the mounting tube of the blade, resulting in concentration of bending stress, which ultimately causes the above-mentioned problem. It was something that could not be solved. On the other hand, when the blade and the grip lever are connected, if the connection is made only by fitting the reinforcing rod, the degree of connection between the blade and the grip rod is weak, and the blade may come off from the grip rod after long-term use. Conventionally, the joint between the blade and the gripping rod is fixed by welding, or a bottle is passed through the joint between the mounting tube, the gripping rod, and the reinforcing rod to connect the blade and the gripping rod. With the handle? However, according to these joining means, in addition to the joining work by fitting the reinforcing rods, joining work such as welding or penetrating the pins is required. However, there was a problem in that the joining work was extremely troublesome and time-consuming. The present invention was devised in view of the above-mentioned circumstances, and the objective is to enlarge the vicinity of the tip of the tubular gripping rod so that even if a small diameter tube is selected, the blade can withstand the bending moment in the gripping rod. It is possible to sufficiently increase the strength around the connection part and at the same time reduce the weight.Moreover, it is possible to fit the connecting piece of the blade into the grip handle lever and press-fit a piece such as a wooden stopper into the connecting piece. The blade and the handle lever can be quickly and easily connected to each other by a simple press-fitting operation, and the connecting piece can be firmly and securely connected to the handle lever without coming off from the handle lever. Accordingly, in the configuration of the present invention, a large portion is provided near the tip of the gripping handle, and a cylindrical connecting piece is provided that projects rearward from the rear end of the blade. An extension part that fits into the tip of the gripping rod and extends obliquely upward from the rear end of the connecting piece toward the rear side is extended together with a child so as to connect the blade to the gripping rod, The outer surface of the extending portion is formed so as to be along the inner surface of the raised portion of the enlarged portion, and the press-fitting piece is press-fitted into the connecting piece. Embodiment 2 of the manual tool of the present invention will be described below based on the drawings. What is shown in the figure is an excavator, and (1) is a hardened f
:1mL, hard metal blade that protrudes backward from its rear end! While the cylindrical connecting piece (10) is integrally extended, the connecting piece (10) is bulged near the tip of the unhardened, soft, tubular 'metal split stem rod (2). By providing an enlarged portion g (20), the connecting piece (10) of the blade (1) is fitted to the tip of the gripping rod (2), and the blade (1) is attached to the gripping rod (2). Together with Naruko, as if joining, the gripping rod

A grip body (21) is fixed to the rear end of [2]. Then, an extension M (11) extending obliquely upward toward the rear side from the rear end of the connecting piece (10) is extended, and the outer surface of the extension part (11) is fixed to the bulge part (20). ], while the press-fit piece (6) is press-fitted into the connecting piece (10). 1. The enlarged portion (20) is extended from a position slightly closer to the blade (1) than the rear part of the press-fitting piece (3), where bending moment is applied during operation, to the proximal side over a certain distance. The cross-sectional outline is circular and equipolar.The metal tube used for the grip handle (2) is normally used.
For example, by using one with a smaller diameter than the one with a diameter of 54 mm, for example, with a diameter of 32 mm and a thickness of 1.2 mm, is there sufficient strength against the bending moment over the certain distance including the bending stress concentration position? The enlarged portion is formed by enlarging the diameter to, for example, 55.2 mm. That is, the thickness of the gripping rod (2) before bulk processing is 71, the average diameter of the inner and outer diameters is 1, the thickness of the enlarged part (20) is t, and the average of the inner and outer diameters is 71. The diameter is +1 (>(11
3, and assuming that the cross-sectional area of the gripping rod (2) does not change before and after extensive processing, πtlxtx=π
d! Therefore, the relationship dxtx=dxtf holds true. By the way, the metal tube used for the gripping rod (2) has an outer diameter of 60 mm and a thickness of 1.2 layers, for example, so that the thickness value relative to the average diameter is extremely smaller than 1.1 Therefore, From the above relational expression, when the handle rod (d) is processed to a large size and the average diameter is increased by a certain percentage, for example 10%, what is the thickness at the above fixed percentage? In addition, the section modulus of a tube with a circular cross section will decrease by the same percentage, for example, by 10%. If it is small, approximately Q, J3
It becomes Dat. Therefore, the section modulus of the gripping rod (2) before and after the extensive processing is approximately 0.8a, since the thickness value relative to the average diameter of the metal tube used is extremely smaller than 1.
? tl, 3.8 & is a mushroom, therefore, the bending moment at each bending stress concentration position (&) of the gripping rod (2) that has not been subjected to extensive processing and for the one that has been subjected to extensive processing) M
The bending stress due to 1-1 is 1* and 0.Bd tl, respectively. Therefore, as described above, the average diameter of the gripping rod (2) is increased by the above-mentioned constant ratio, for example, 10%, and then When the thickness is reduced by the same percentage, for example 10%, the bending stress concentration position

The bending stress applied to [&] is the constant ratio! It will decrease by the same percentage, for example 10%. The connecting piece (10) is press-molded at the same time as the blade (1), and has a cylindrical shape that tapers toward the rear end, and has an open portion at its lower end. (IQa) is formed, and an extension 1 (11)E extending diagonally upward toward the rear side from the road half of the rear end is connected to the connecting piece (10) and the grip lever (2). 2, the outer surface of the extending portion (11) becomes bulged as shown in FIG.
In (20), it is located along the inner surface of the raised portion (&) where the stress is most concentrated. (12) is a stepped portion, and the connecting piece

[10] Grip handle (2)
This is the contact between the blade (1) and the grip lever (2) when the blade (1) is fitted into the handle. Further, as the press-fitting piece (5), the coupling piece (1
Use a cylindrical faucet or plastic member with a larger diameter than the inner diameter of 0], and a part of the taper (61) is used at the press-fit end.
is provided so that the press-fitting piece (3) can be press-fitted into the coupling piece (10) smoothly. This press-fitting piece (6) may have a cylindrical shape as shown in the drawing, or may have a tapered shape. The present invention is constructed as described above, and the blade (1
) and the gripping rod (2), first fit the connecting piece (10) of the blade (1) to the tip of the gripping rod (2).In this case, the extending portion ( The tip of the blade (1) is inclined upward so that the inclined end (Ila) of the blade (11) comes into contact with the inner surface of the handle lever (2), and in this state, the diameter of the connecting piece (10) is not reduced. It is mated from T,
Then, this connecting piece (10) f: When fitted to the grip lever (2), the connecting piece (10) f:

10 is enlarged in diameter within the gripping rod (2), and the outer surface of the extension g [I L] is a raised part where stress is most concentrated in the enlarged part (20).

The connecting piece (10) is located along the inner surface of the [&] and prevents the connecting piece (10) from coming off from the grip lever (2).

10), the diameter of the coupling piece (10) is expanded by this press-fitting, and the outer peripheral surface of the coupling piece (10) is connected to the inner surface of the gripping rod (2). At the same time,
The extending portion (11) is also enlarged in diameter, and its outer surface becomes the enlarged [
(&) to strengthen the raised part (&) where the stress is most concentrated by the extension part (11), and at the same time, the extension part

By hooking onto the raised portion (&) of [11], it is possible to reliably prevent the connecting piece (10) from slipping out from the grip lever (2). In the above-mentioned embodiments, the entire connecting piece (10) is cylindrical, but as shown in FIGS. 5 to 7, the connecting piece (10)
Proximal end of (15) cross-sectional shape

[Open in a substantially U-shape, with its open edges (15a) and (15&) protruding outward beyond the rear end side outer peripheral surface of the connecting piece (10), and the gripping rod (2)
The protruding ends (15a) and (15a) may be configured to interfere with the inner circumferential surface of the distal end of the protruding end and deform it outwardly in a raised shape. With this configuration, when the connecting piece (10) is fitted to the gripping rod (2), since the connecting piece (10) is harder than the gripping rod (2), the connecting piece [10] ] After S1im (15)
Projecting edges (15a), (15
a) interferes with the inner circumferential surface of the tip of the gripping lever (2), and the 10th
As shown in the figure, push the tip of the grip lever (2) outward,
The distal end edge (b) portion of the distal end portion is formed into a protruding end edge (15a), (
15&] so that the open side of the grip lever (2) is pressed and deformed into a substantially straight line, and the protruding edges (15a), (15a)
While biting into the inner surface of the tip edge (b) m, the connecting piece of the press-fit piece (6)

10) The protruding edges (15a) and (15&)f are expanded outward by press-fitting, and the approximately linear tip edge (b) of the gripping lever (2) is inserted into the press-fitting piece ( 3), the outer circumferential surface presses and deforms it outward as shown in FIG. As a result, the protruding edge (15a)
, (15a) are inserted into the tip of the gripping rod (2) to strengthen the rotation prevention between the coupling piece (10) and the gripping rod (2), and at the same time, the press-fitting piece (6) is During press-fitting, the tip edge (b) of the gripping rod (2) bites into the outer circumferential surface of the press-fit piece (6) as shown in Figure 8, and this tip edge bites into the press-fit piece (3). By inserting the press-fit piece (
6) can also be reliably prevented from coming off from the coupling piece (10). In addition, in the embodiment described above, if the cross-sectional shape of the enlarged portion (20) and the connecting piece (10) of the blade (1) is made non-circular, such as an ellipse, the section modulus becomes larger in the load direction side. Furthermore, as shown in FIG. 11, six to six grooves [0] extending along the length direction are provided on the outer periphery of the bulged portion (20). If so, it is preferable to increase the strength of the bulge (20) and at the same time prevent the hand from slipping when gripping the bulge (20).Furthermore, the above embodiments are applicable to an excavator. However, although not shown, it goes without saying that it can be applied in exactly the same way to shovels, agricultural hawks, etc. As described above, the present invention provides a large portion near the tip of the handle rod, while the blade A cylindrical connecting piece is provided to protrude rearward from the rear end, and the connecting piece is connected to the handle rod with a formation T, and the connecting piece is extended rearward from the rear end of the connecting piece. An extending portion extending obliquely upward is extended, and the outer surface of the extending portion is aligned with the inner surface of the protruding portion in the enlarged portion, and a press-fitting piece is press-fitted into the connecting piece. By enlarging the vicinity of the tip of the tubular gripping rod, even if a small-diameter gripping rod is selected, the strength of the rear portion of the press-fit piece to which bending moment is applied during work can be sufficiently increased. If possible, the weight of the blade can be reduced at the same time, and in addition, the means for connecting the blade and the gripping rod can be used to fit the connecting piece of the blade into the gripping rod and press-fit the press-fitting piece into the connecting piece. While the blade and the gripping rod can be quickly and easily connected by a simple joining operation, when the connecting piece and the gripping rod are connected, the outer surface of the extending portion extending to the rear of the connecting piece is , located along the inner surface of the raised portion where stress is most concentrated in the expanded portion, the extended portion strengthens the expanded portion, and prevents the connecting piece from being pulled out from the handle lever. It can definitely be prevented.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view;
Figure 2 is a cutaway side view, Figure 6 is a side view with a small radius, Figure 4 is a bottom view of the same, Figure @5 is a side view showing another embodiment of the blade, Figure 6 is a bottom view, Fig. 7 is a sectional view taken along the line ■-■, Fig. 8 is a cutaway side view showing another embodiment, and Fig. 9 is a cutaway side view showing the same blade fitted into the handle lever. , FIG. 10 is a sectional view taken along the line X-X in FIG.
The figure is a sectional view taken along the line XX in FIG. 9. 1...Blade (10)...Joining piece (11)...Extension part (2)...Grip handle rod (20)...Ampullae part (a)...Protuberance procedure Amendment 1. Case (DH Indicative Patent Application No. 40962 of 1982, Title of invention: Hand tool 3, Person making the amendment. Relationship to the case. Applicant address: 2-117-4, Kaiyama-cho, Sakai City, Osaka Prefecture, Agent. Address: 5 Yonezawa Building, 1-9-9 Sumiyoshibashi-cho, Sakai-shi, Osaka 590, Japan Date of amendment order: ``To provide... ...preferable" is corrected as follows. "If provided, the strength of the bulge (20) can be increased and at the same time, it is possible to prevent the hand from slipping when gripping the bulge (20). In this case, if the shape of the upper surface of the extending portion (11) matches the bottom surface of the groove (C), the engagement between the upper surface of the extending portion (11) and the groove (C) will be reduced. This is preferable because the coupling piece (10) and the gripping rod (2) can be prevented from rotating by fitting together.

Claims (1)

[Claims] A manual tool such as a shovel or shovel that is composed of a blade and a tubular handle, and has a large portion near the tip of the handle and a T that protrudes rearward from the rear end of the blade. A cylindrical connecting piece is provided protrudingly, and the connecting piece is fitted to the tip of the gripping handle, and the blade is connected to the gripping handle with a T and rearwardly from the rear end of the connecting piece. An extending portion extending upward toward the side is continuously extended, and the outer surface of the extending portion is aligned with the inner surface of the raised portion in the enlarged portion.Meanwhile, a press-fitting piece is press-fitted into the connecting piece. A hand tool that is characterized by: