Bolt fall-out prevention device

Abstract

To provide a bolt coming-off prevention tool for a shackle, which prevents a bolt from coming off from a shackle body.SOLUTION: A bolt fall-out prevention tool 1 for shackles includes a main body plate 2, a positioning part 4, and a pressing part 3, wherein the main body plate 2 includes a leg part insertion hole through which a pair of left and right leg part side S1a of the shackles S is inserted, the positioning part 4 is provided on a surface of the shackles S facing a bolt, the pressing part 3 is provided on a side where a head part of the bolt side S2a of the shackles S is disposed, and the positioning part 4 includes a pair of left and right guide members 41 along the pair of left and right leg part side S1a of the shackles S. The lower end side of the guide member 41 is provided with a bolt insertion hole overlapped with a bolt hole provided on the lower end side of a pair of right and left side S1a of the shackles S and inserting the bolt S2a part of the shackles S, and the pressing part 3 is fixed to the body plate 2 so as to abut on the head part of the bolt S2a part of the shackles S.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bolt pullout protector. [Background technology]

[0002] A shackle is composed of a U-shaped shackle body and a bolt and nut that are inserted and fixed into bolt holes provided at both ends of a pair of U-shaped legs, and is used to connect a heavy object to a wire rope when lifting and moving the object using a crane, etc. With such shackles, the weight or vibration of the heavy object acting on the shackle can cause the bolt part of the shackle to rotate, resulting in the nut loosening, causing the split pin to break or fall off, or the nut to fall out and the bolt to come out.

[0003] In this regard, a known conventional shackle is that described in Patent Document 1. In the shackle described in Patent Document 1, the shackle body and the head of the bolt are connected by a wire rod. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-24091 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the shackle of Patent Document 1, even if the cotter pin breaks or falls off the shackle body, causing the nut to come loose, and the bolt to come loose, the bolt is connected to the shackle body by a wire, so the bolt can be prevented from falling. However, there is a problem in that it cannot prevent the bolt from coming loose from the shackle body itself.

[0006] In view of the above problems, the present invention aims to provide a bolt slippage protector for a shackle that prevents the bolt from slipping out of the shackle body even if the nut falls out due to damage or loss of the split pin. [Means for solving the problem]

[0007] The above object of the present invention can be achieved by the following means: Note that the parentheses indicate reference symbols of embodiments to be described later, but the present invention is not limited to these.

[0008] The bolt pullout protector (1) for a shackle (S) according to claim 1 is A bolt pull-out protection device (1) for a shackle (S), The device comprises a main body plate (2), a positioning portion (4), and a pressing portion (3), The main body plate (2) a leg insertion hole (21) through which a pair of left and right legs (S1a) of the shackle (S) are inserted, The positioning portion (4) is provided on a surface (back surface 23) of the shackle (S) facing the bolt (S2a), The pressing portion (3) is provided on one of the left and right end sides where the head (S2a1) of the bolt (S2a) of the shackle (S) is disposed, The positioning portion (4) is a pair of left and right guide members (41) along the pair of left and right leg portions (S1a) of the shackle (S); The lower end side of the guide member (41) is provided with a bolt insertion hole (44) which is aligned with a bolt hole provided on the lower end side of the pair of left and right leg portions (S1a) of the shackle (S) and through which the bolt (S2a) of the shackle (S) is inserted, The holding portion (3) The bolt (S2a) of the shackle (S) is fixed to the main body plate (2) so as to abut against the head (S2a1) of the bolt (S2a). [Effects of the Invention]

[0009] Next, the effects of the present invention will be described with reference to the drawings. Note that the reference symbols in parentheses are those of the embodiments described below, but the present invention is not limited to these.

[0010] According to the invention of claim 1, when the bolt slippage preventer (1) is attached to the shackle (S), the pair of left and right guide members (41) of the positioning part (4) are aligned with the pair of left and right leg portions (S1a) of the shackle (S). Furthermore, when the bolt slippage preventer (1) is attached to the shackle (S), the bolt insertion hole (44) at the lower end of the guide member (41) is aligned with the bolt hole of the shackle (S). Then, when the bolt (S2a) of the shackle (S) is inserted into the bolt hole of the shackle (S), it is also inserted into the bolt insertion hole (44) at the lower end of the guide member (41).

[0011] Therefore, the positioning portion (4) restricts the main body plate (2) from moving up and down and left and right relative to the shackle (S).

[0012] Therefore, when the retaining portion (3) is fixed to the main plate (2), its movement in the up / down and left / right directions relative to the shackle (S) is restricted. Therefore, even if the bolt (S2a) tries to move in the direction of coming out (to the left in Figure 1), its movement is blocked by the retaining portion (3). In this way, the bolt dislodgment protector (1) can prevent the bolt (S2a) from coming out.

[0013] Thus, according to the present invention, it is possible to provide a bolt slippage preventer for a shackle that prevents the bolt from slipping out of the shackle body even if the nut falls out due to damage or loss of the split pin. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a shackle to which an embodiment of a bolt slippage protector according to the present invention is attached. [Figure 2] FIG. 2 is a front view of a shackle equipped with a bolt slippage protector according to the embodiment. [Figure 3] 1A is a plan view of the main body plate and positioning portion of the bolt pullout protector according to the embodiment, FIG. 1B is a front view of the same, and FIG. 1C is a left side view of the same. [Figure 4] 1A is a plan view of a retaining portion of the bolt pullout protector according to the embodiment, and FIG. 1B is a front view of the same. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, one embodiment of a bolt pullout protector according to the present invention will be specifically described with reference to the drawings. In the following description, when directions such as up, down, left, and right are indicated, they refer to up, down, left, and right when viewed from the front of the illustration.

[0016] <Shackle Description> First, a brief description will be given of the shackle S to which the bolt pullout protector 1 is attached. The shackle S is a conventionally known shackle, as shown in FIGS. 1 and 2. More specifically, the shackle S is composed of a U-shaped shackle body S1, a bolt S2a, and a nut S2b. As shown in FIGS. 1 and 2, the shackle body S1 has a pair of left and right (left and right as shown in FIGS. 1 and 2) U-shaped legs S1a. Each of the pair of left and right legs S1a has a bolt hole (not shown) at its lower end. As shown in FIGS. 1 and 2, the bolt S2a is inserted into this bolt hole (not shown) and fastened and fixed by a nut S2b. The bolt pullout protector 1 according to the present invention is attached to such a conventionally known shackle S to prevent the bolt S2a from coming out of the shackle body S1.

[0017] <Outline of bolt removal protection equipment> Next, a bolt pullout protector 1 according to this embodiment will be described. As shown in Figures 1 and 2, the bolt pullout protector 1 is mainly composed of a main body plate 2, a pressing portion 3, and a positioning portion 4. Each component will be described below.

[0018] <Main board description> As shown in FIGS. 1 and 2, the main body plate 2 is a rectangular flat plate-shaped member made of steel.

[0019] The main body plate 2 will be described in more detail with reference to Fig. 3(a). As shown in Fig. 3(a), the main body plate 2 has a pair of leg insertion holes 21 aligned in the left-right direction in Fig. 3(a) (corresponding to the left-right direction shown in Figs. 1 and 2).

[0020] As shown in Fig. 3(a), the main body plate 2 has a pair of elongated holes 22 aligned in the vertical direction in Fig. 3(a) (corresponding to the front-rear direction in Fig. 1) on one end side (the left side in the figure, which corresponds to the left side in Figs. 1 and 2). The pair of elongated holes 22 are holes that are long in the left-right direction in Fig. 3(a) (corresponding to the left-right direction in Fig. 1).

[0021] The horizontal plate 42 appearing in the leg insertion hole 21 shown in FIG. 3(a) will be described later.

[0022] <Description of positioning part> As shown in FIGS. 1 and 2, the positioning portion 4 is a downward U-shaped member made of steel.

[0023] The positioning unit 4 will be described in more detail with reference to Figures 3(b) and 3(c). As shown in Figure 3(b), the positioning unit 4 is integrally formed of a rectangular flat horizontal plate 42 and a pair of left and right rectangular flat guide members 41. The pair of left and right guide members 41 are formed so that the left and right ends of the horizontal plate 42 in Figure 3(b) (corresponding to the left and right shown in Figures 1 and 2) extend vertically downward.

[0024] 1 and 2, particularly Fig. 2, when the bolt disengagement protector 1 is attached to the shackle S, the pair of guide members 41 are aligned along the inside of the pair of legs S1a of the shackle S (the sides of the pair of legs S1a facing each other). Therefore, as shown in Fig. 3(b), the pair of guide members 41 are formed with a gap therebetween that corresponds to the gap between the insides of the pair of legs S1a of the shackle S (see Fig. 2).

[0025] 3(c), each of the pair of guide members 41 has a bolt insertion hole 44 formed near the center in FIG. 3(c). As shown in FIGS. 1 and 2, when the bolt slippage preventer 1 is attached to the shackle S, this bolt insertion hole 44 is aligned with a bolt hole (not shown) formed in the lower end of the leg S1a of the shackle S. Then, as shown in FIGS. 1 and 2, when the bolt S2a of the shackle S is inserted through the bolt hole of the shackle S, it is also inserted through the bolt insertion hole 44 on the lower end side of the guide member 41. Therefore, the bolt insertion hole 44 has a size that allows at least the shank of the bolt S2a to be inserted therethrough.

[0026] In the perspective view shown in FIG. 1, the left bolt insertion hole 44 and the portion of the bolt S2a that passes through the left bolt insertion hole 44 are hidden by the leg portion S1a and are therefore shown by dashed lines.

[0027] As shown in Figures 2, 3(b), and 3(c), the positioning portion 4 is attached to the rear surface 23 of the main body plate 2 by welding. As shown in Figure 3(c), reinforcing ribs 43 in the shape of right triangles are provided to reinforce the welded fixation between the main body plate 2 and the positioning portion 4. As shown in Figure 3(c), two reinforcing ribs 43 are provided per guide member 41, one in the left-right direction in Figure 3(c) (the front-rear direction shown in Figure 1). Therefore, the welded fixation of the positioning portion 4 to the main body plate 2 is reinforced by a total of four reinforcing ribs 43 (see Figures 3(b) and 3(c)).

[0028] <Explanation of the holding part> As shown in Figures 1 and 2, the retaining portion 3 is an inverted L-shaped member made of steel. This retaining portion 3 will be described in more detail with reference to Figures 4(a) and 4(b). As shown in Figure 4(b), the retaining portion 3 is integrally formed of a horizontal plate 31a and a vertical plate 31b. The vertical plate 31b is formed so as to extend vertically downward from the right end of the horizontal plate 31a in Figure 4(b) (corresponding to the right end in Figures 1 and 2).

[0029] As shown in FIG. 4(a), the horizontal plate 31a of the pressing portion 3 is formed with a pair of bolt holes 31a1 aligned in the vertical direction in FIG. 4(a) (corresponding to the front-rear direction in FIG. 1).

[0030] As shown in Figures 1 and 2, the pressing portion 3 is attached to the rear surface 23 of the main body plate 2 by a bolt 33. As shown in Figure 4(b), a reinforcing rib 32 in the shape of a right triangle is provided to reinforce the right-angled portion of the inverted L-shape of the pressing portion 3. As shown in Figure 4(c), one reinforcing rib 32 is provided in the left-right center in Figure 4(c) (the front-to-back center in Figure 1).

[0031] <How to use bolt removal protection> Next, a method of using the bolt pullout protector 1 according to this embodiment will be described.

[0032] First, the bolt S2a of the shackle S is removed from the shackle body S1. In this state, as shown in Figure 1, the pair of left and right legs S1a of the shackle body S1 are inserted into the pair of left and right leg insertion holes 21 provided in the main body plate 2 of the bolt slippage protector 1. At this time, the guide members 41 of the positioning part 4, which are welded to the back surface 23 of the main body plate 2, are aligned along the inside of the pair of left and right legs S1a of the shackle S.

[0033] Then, the shackle body S1 is pushed down until the bolt insertion hole 44 (see FIG. 3(c)) of the positioning portion 4 is aligned with the bolt hole of the shackle S.

[0034] Next, as shown in Figures 1 and 2, the removed bolt S2a is inserted through the bolt hole of the shackle S and the bolt insertion hole 44 (see Figure 3(c)) of the bolt slippage protector 1 that is superimposed on the bolt hole. Furthermore, as shown in Figures 1 and 2, the tip end side (right side in Figures 1 and 2) of the bolt S2a is fastened with a nut S2b. Furthermore, as shown in Figures 1 and 2, a split pin S2c is inserted into a hole (not shown) provided on the tip end side (right side in Figures 1 and 2) of the bolt S2a, and the nut S2b is fixed.

[0035] Finally, as shown in FIGS. 1 and 2, the retainer 3 is attached to the main body plate 2. More specifically, as shown in FIGS. 1 and 2, a pair of bolt holes 31a1 (see FIG. 4(a)) formed in the horizontal plate 31a of the retainer 3 is aligned with a pair of elongated holes 22 (see FIG. 3(a)) formed in the main body plate 2. At this time, the position of the retainer 3 relative to the main body plate 2 is determined so that the vertical plate 31b of the retainer 3 abuts against the head S2a1 of the bolt S2a of the shackle S. Then, the bolt 33 is fastened to the elongated hole 22 of the main body plate 2 and the bolt hole 31a1 of the retainer 3. As a result, the retainer 3 is fixed to the main body plate 2 in a state of abutting against the head S2a1 of the bolt S2a.

[0036] According to the present embodiment described above, when the bolt disengagement protector 1 is attached to the shackle S, the pair of left and right guide members 41 of the positioning part 4 are aligned with the pair of left and right leg portions S1a of the shackle S. Furthermore, when the bolt disengagement protector 1 is attached to the shackle S, the bolt insertion hole 44 on the lower end side of the guide member 41 is aligned with the bolt hole of the shackle S. Therefore, when the bolt S2a of the shackle S is inserted through the bolt hole of the shackle S, it is also inserted through the bolt insertion hole 44 on the lower end side of the guide member 41.

[0037] Therefore, the main body plate 2 is restricted from moving up and down and left and right relative to the shackle S by the positioning portion 4.

[0038] Therefore, when the retaining portion 3 is fixed to the main plate 2, its movement up and down and left and right relative to the shackle S is restricted. Therefore, even if the bolt S2a tries to move in the direction of coming out (to the left in Figure 1), its movement is blocked by the retaining portion 3. In this way, the bolt pullout protector 1 can prevent the bolt S2a from coming out.

[0039] As described above, according to this embodiment, it is possible to provide a shackle bolt loss prevention device 1 that prevents the bolt S2a from coming out of the shackle body S1 even if the nut falls out due to damage or loss of the split pin.

[0040] <Description of Modifications> The bolt pullout preventer shown in this embodiment is merely an example, and various modifications and changes are possible within the scope of the gist of the present invention as described in the claims. For example, in this embodiment, the positioning part 4 is fixed to the main body plate 2 by welding, but it may also be fixed by screws. [Explanation of symbols]

[0041] 1 Bolt-out Armor 2 Main board 21 Leg insertion hole 3 Presser foot 4 Positioning part 41 Guide member 44 Bolt insertion hole S shackle S1a leg S1a1 inner S1b bolt hole S2a bolt S2a1 head S2a2 shaft part

Claims

[Claim 1] A bolt pull-out protection for a shackle, The device includes a main body plate, a positioning portion, and a pressing portion, The body plate leg insertion holes for inserting the pair of left and right legs of the shackle; The positioning portion is provided on a surface of the shackle facing the bolt, The pressing portion is provided on one of the left and right end sides where the head of the shackle bolt is arranged, The positioning unit is a pair of left and right guide members along the pair of left and right legs of the shackle; The lower end side of the guide member is provided with a bolt insertion hole that is aligned with a bolt hole provided on the lower end side of the pair of left and right legs of the shackle and through which the bolt of the shackle is inserted, The holding portion The bolt is fixed to the main body plate so as to abut against the head of the shackle bolt. Shackle bolt pull-out protection.

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