JP7840053B2 - Tool to stop the propeller shaft from spinning freely - Google Patents

Description

The present invention aims to provide a coupling for a marine engine and a tool to prevent the propeller shaft from slipping.

Conventionally, although not for marine applications (it is for automotive applications, Patent Document 1), a rotation-preventing structure for fixing a pinion flange to a rotation shaft is known, characterized by having a rotating shaft with a threaded portion at one end, a pinion flange provided on the threaded portion, anti-rotation holes 22-1, 22-1 drilled in the flange portion of the pinion flange, a corrugated anti-rotation portion 24 provided on the outer circumference of the flange portion, a pin jig 26 (engaging projections 28, 28 that engage with the anti-rotation holes 22-1, 22-1) as shown in Figure 4 of Patent Document 1, and a corrugated jig 30 (corrugated engaging portion 32 that engages with the corrugated anti-rotation portion 24) as shown in Figure 5 of Patent Document 1, where the engaging projections 28, 28 of the pin jig 26 are inserted into the anti-rotation holes 22-1, 22-1, or the corrugated engaging portion 32 of the corrugated jig 30 is engaged with the corrugated anti-rotation portion 24, and the user can choose either one of these (Patent Document 1).

Furthermore, although not for marine applications (it is for automotive applications, as per Patent Document 2), the flange 30 of the flange yoke 10 of the propeller shaft 200 is provided with notches 33, 33 (see Figures 3 and 4 of Patent Document 2). Meanwhile, the tool 400 shown in Figure 5 of Patent Document 2 has a U-shaped arm 411, and projections 412, 412 are formed at the tip of the arm 411. By engaging the projections 412, 412 of the tool 400 with the notches 33, 33 of the flange 30, the flange 30 of the flange yoke 10 is prevented from rotating (Patent Document 2).

Alternatively, for marine applications, a propeller shaft and coupling are used to connect the engine and propeller. In this case, to securely fasten the propeller shaft and coupling, it is necessary to firmly tighten the hexagonal nut with male and female threads, which is machined onto the front end of the propeller shaft.

Japanese Patent Application Publication No. 2-62426 Japanese Patent Publication No. 2013-221577

By the way, in Patent Document 1, either inserting the pin jig 26 or engaging it with the corrugated jig 30 requires holding both the pin jig 26 and the corrugated jig 30 by hand. In Patent Document 2, the tool 400 requires holding the handle 420 by hand. In both cases, the pin jig 26 (Patent Document 1) or the corrugated jig 30 (Patent Document 1) and the tool 400 (Patent Document 2) by hand is required, which is tiring and makes the work inefficient.

Traditionally, for marine applications, to prevent the propeller shaft from spinning freely during tightening, wood or other material was inserted between the propeller (attached to the rear of the shaft) and the ground. This method was inefficient and cumbersome.

This invention was made in view of the above-mentioned conventional problems, and comprises a tool for stopping the free rotation of a propeller shaft, which is installed on the floor to prevent it from being held in the hand.

To achieve the above objectives, the present invention
Firstly, in a tool for stopping the free rotation of a propeller shaft, in which a shaft hole is opened in the front-rear direction of the coupling, a male screw is formed at the tip of the propeller shaft, the tip of the propeller shaft is inserted into the shaft hole, a hexagonal nut is screwed onto the male screw from the front side of the coupling, a key is fitted to the shaft hole of the coupling and the propeller shaft, and multiple bolt holes are formed in the flange of the coupling, the base is linearly long in the left-right direction, a first through hole is opened in the front-rear direction at the first tip, a U-shaped angle is covered on the raised part of the upper surface in the middle, the right sides of the front and rear sides of the raised part of the angle is pivotally supported on the raised part, the upper end is fitted to the lower side of the angle on the raised part in the middle, and the upper end is aligned linearly in the left-right direction from the middle to the second tip which is at the same position as the first tip, in the same way as the base, The upper end portion has a second through-hole opening in the front-rear direction at its second tip, and the upper end portion and the angle are pivotally supported on the raised portion so as to be able to open and close relative to the base portion. The base portion is placed on the floor surface in the left-right direction behind or in front of the flange of the coupling, and the upper end portion and the angle are pivotally supported on the base portion. The tool for stopping the rotation of a propeller shaft is characterized by the following: the upper end portion is aligned with the second through-hole at the second tip of the upper end portion into one bolt hole of the flange of the coupling, and a second bolt is inserted through the second through-hole and the first bolt hole; the other bolt hole of the flange of the coupling is aligned with the first through-hole at the first tip of the base portion, and a first bolt is inserted through the first through-hole and the other bolt hole; and the base portion is installed on the floor surface.

One of the bolt holes is bolt hole (11 (11a)), and the other bolt hole is bolt hole (11 (11b)). With the base installed on the floor surface in the left-right direction using a tool to stop the propeller shaft from rotating freely, the upper end is opened upward, the upper end is aligned with the second through hole at the second tip, and the second through hole is aligned with one of the bolt holes (11 (11a)) of the coupling flange, and the second bolt is inserted through the second through hole and the one bolt hole (11 (11a)), the first through hole at the first tip of the base is aligned with the other bolt hole (11 (11b)), and the first bolt is inserted through the first through hole and the other bolt hole (11 (11b)), thereby fixing the coupling and the propeller shaft. The base is then installed on the floor surface. Subsequently, the hexagonal nut is screwed onto the male screw, the hexagonal tip of the hex wrench is fitted onto the hexagonal nut, and it is rotated in the direction of the arrow to tighten or loosen the hexagonal nut. This securely fixes the coupling and the propeller shaft using the tool that prevents the propeller shaft from rotating freely. The tool that prevents the propeller shaft from rotating freely also allows the base to be placed on the floor, preventing it from being held by hand.

Secondly, the tool for preventing the propeller shaft from rotating freely, as described in the first section, is comprised of nuts screwed onto the front or rear ends of the first and second bolts, respectively.

The nuts are screwed into the front or rear ends of the second bolt and the first bolt, respectively, in the one bolt hole (11 (11a)) and the other bolt hole (11 (11b)). Since the second bolt and the first bolt are fixed in place, the rotation (free-spinning) of the coupling and the propeller shaft can be stopped.

Thirdly, the shaft hole is tapered, with a larger diameter at the rear and a smaller diameter at the front. The tapered portion at the tip of the propeller shaft is also tapered, with a larger diameter at the rear and a smaller diameter at the front. The shaft hole and the tapered portion of the propeller shaft are configured to fit together, and the tool for stopping the propeller shaft from free-rotating is configured as described in the first or second description above.

The shaft hole of the coupling described above is tapered, and the tapered portion of the tip of the propeller shaft is also tapered. The shaft hole and the tapered portion of the propeller shaft are configured to fit together, and as a result, the shaft hole and the tip of the propeller shaft are securely fixed by a tool that prevents the propeller shaft from rotating freely.

Fourth, the upper surface of the angle is fitted with a screw that is screwed into the upper surface of the upper end of the propeller shaft, as described in the first or second description above, which is a tool for preventing the propeller shaft from rotating freely.

The upper surface of the angle bracket is screwed into the upper surface of the upper end, and the angle bracket and the upper end will never come apart.

Fifth, the tool for stopping the propeller shaft from spinning freely, as described in the first or second description above, is configured such that the front and rear right sides of the raised portion of the base have third through holes extending in the front-to-back direction, the front and rear right sides of the angle have semicircular portions formed on both sides of the raised portion, a fourth through hole is formed in the semicircular portion on the front side and a fourth through hole is formed in the semicircular portion on the rear side at the position of the third through hole, a pivot bolt is inserted through both the fourth and third through holes, a nut is screwed onto the rear or front end of the pivot bolt, thereby pivoting the pivot bolt, the angle and the upper end are pivotally supported by the pivot bolt, and the upper end is configured to open and close relative to the base.

In this configuration, the pivot bolt is pivotally supported, the angle and the upper end are pivotally supported by the pivot bolt, and the angle and the upper end are configured to open and close relative to the base.

As described above, the present invention involves using a tool to stop the propeller shaft from rotating freely. With the base installed on the floor, the upper end is opened upwards, the upper end aligns the second through-hole with the second tip and one bolt hole in the coupling flange, inserting the second bolt through the second through-hole and the one bolt hole, aligning the first through-hole with the other bolt hole in the first tip of the base, inserting the first bolt through the first through-hole and the other bolt hole, thereby fixing the coupling and the propeller shaft. The base is then installed on the bottom surface. Subsequently, a hexagonal nut is screwed onto the male screw, the hexagonal tip of a hexagonal wrench is fitted onto the hexagonal nut, and it is rotated in the direction of the arrow to tighten or loosen the hexagonal nut. This firmly fixes the coupling and the propeller shaft using the tool to stop the propeller shaft from rotating freely. The tool used to stop the propeller shaft from spinning freely allowed the base to be placed on the floor, preventing it from being held by hand.

The nuts are screwed into the front or rear ends of the second bolt and the first bolt, respectively, into the one bolt hole and the other bolt hole mentioned above. Since the second bolt and the first bolt are fixed in place, the rotation (free-spinning) of the coupling and the propeller shaft can be stopped.

The shaft hole of the coupling described above is tapered, and the tip of the propeller shaft is also tapered. The shaft hole and the tapered portion of the propeller shaft are configured to fit together, and thus, the shaft hole and the tapered portion are securely fixed by a tool that prevents the propeller shaft from rotating freely.

Furthermore, the above-mentioned pivot bolt is pivotally supported, and the angle and the upper end are pivotally supported by the above-mentioned pivot bolt. The angle and the upper end are configured to be able to open and close relative to the base.

(a) is a plan view and (b) is a side view of the tool for stopping the free rotation of a propeller shaft according to the present invention. (a) is a front view and (b) is a rear view of the tool used to stop the propeller shaft from spinning freely. This is a cross-sectional view taken along line X-X in Figure 1(b) of the tool used to stop the propeller shaft from spinning freely. This is a side view showing the upper end of the tool used to stop the propeller shaft from spinning freely, with the opening removed. This is a perspective view (front perspective view) of the tool used to stop the propeller shaft from spinning freely, which is secured to the flange of the tool with two bolts. This is a perspective view (rear perspective view) of the tool used to stop the propeller shaft from spinning freely. This is a perspective view (front perspective view) of a hex wrench inserted into a bolt of a tool used to stop the propeller shaft from spinning freely. The above is a perspective view (rear perspective view) of a hex wrench attached to the flange of the propeller shaft, which is a tool used to stop the propeller shaft from spinning freely. This is a magnified side view of the bolt of the tool used to stop the propeller shaft from spinning freely. This is a cross-sectional view of the coupling of the tool used to stop the propeller shaft from spinning freely, and the propeller shaft itself. The above image shows a side cross-sectional view of a marine propeller shaft and engine, along with a tool used to stop the propeller shaft from spinning freely.

The following describes the tool 1 for stopping the free rotation of a propeller shaft according to the present invention.

Figure 1 illustrates a tool 1 for stopping the free rotation of a propeller shaft according to the present invention. Before that, a propeller shaft for a ship will be explained based on Figure 11. Figure 11 shows a propeller shaft 2 used for a ship, with the engine 3 and the propeller shaft 2 connected via a gearbox 4. The gearbox 4 is connected to the propeller shaft 2 by couplings 5 and 6. Coupling 5 is directly connected to the gearbox 4.

The coupling 5 is composed of a flange 5a and a body 5b, and the coupling 6 is composed of a flange 6a and a body 6b. The flanges 5a and 6a are connected by multiple bolts (for example, 8). The propeller shaft 2 has a propeller 8 connected to its rear end, where it extends beyond the hull 9. G is the floor surface of the hull.

The coupling 6 and propeller shaft 2 are configured as follows (see Figure 10). In Figure 10, the right side of the drawing is defined as the "rear side," the left side as the "front side," and the front-to-back direction as defined in the drawing as the "left-to-right direction." The main body 6b has a tapered shaft hole 6c (circular) opening in the center (the diameter of the rear side 6f is larger, and the diameter of the front side 6f' is smaller), with a deep circular opening 6d at its tip. The flange 6a has a shallow circular opening 6e with a wider diameter. The coupling 6 has the openings 6e and 6d and the tapered shaft hole 6c passing through from front to back. The central axis of the shaft hole 6c, openings 6d and 6e is P.

Furthermore, the key 10 is connected to an anti-rotation mechanism. The key 10 is rectangular in shape and is formed separately from the main body 6b. The protruding slits 6g, 6g are provided protruding in the front-rear direction from the shaft hole 6c of the coupling 6 (the left-right width of the protruding slits 6g, 6g is slightly wider than the left-right width of the key 10), and the propeller shaft 2 has a recessed slit 6g' formed therein. The front-rear and left-right widths of the key 10 fit into the recessed slit 6g', and the lower end portion 10a protrudes from the propeller shaft 2. The key 10 is fitted into the recessed slit 6g'. The lower end 10a of the key 10 on the propeller shaft 2 is then aligned with the protruding slits 6g, 6g of the coupling 6. The shaft hole 6c of the coupling 6 and the propeller shaft 2 are then fitted (inserted) until the lower end 10a of the key 10 reaches the midpoint of the protruding slits 6g, 6g in the front-to-back direction (for example, by inserting the propeller shaft 2 into the shaft hole 6c of the coupling 6 with a hammer). This fixes the propeller shaft 2 and the coupling 6 (shaft hole 6c). Therefore, the propeller shaft 2 and the coupling 6 rotate as a single unit. Note that 11, 11 are multiple bolt holes (for example, 8).

Furthermore, the tip portion 2a' of the propeller shaft 2 has a tapered portion 2a (with a larger diameter at the rear 2d and a smaller diameter at the front 2d') which is the same size as (slightly smaller than) the tapered shaft hole 6c, and a male screw 2b is provided at the tip of the tapered portion 2a (the center of the propeller shaft 2 (the tapered portion 2a and the male screw 2b) is the central axis P). The male screw 2b is located at the center of the opening 6d (central axis P). A hexagonal nut 12 (female screw) is screwed into the male screw 2b. When the hexagonal nut 12 is tightened, the peripheral edge 12a of the hexagonal nut 12 abuts against the stepped portion 6d' of the opening 6d, and the tapered portion 2a of the propeller shaft 2 fits into the tapered shaft hole 6c. Therefore, when the hexagonal nut 12 is tightened, the coupling 6 and the propeller shaft 2 rotate (free-spin).

The coupling 6 and the propeller shaft 2 rotate simultaneously (freewheel) when the hexagonal nut 12 is tightened (and similarly when loosened). The same occurs when loosening it. This invention relates to a tool 1 that prevents the freewheeling of the propeller shaft 2 (coupling 6) when tightening or loosening the hexagonal nut 12.

Returning to Figure 1, let's describe tool 1, which stops the propeller shaft from spinning freely. Looking at Figures 1(a) and 1(b), Figures 3 and 4, the left direction is defined as "left side" or "left," the right direction as "right side" or "right," the upper direction in Figures 1(a) and 3 as "rear side" or "rear," the lower direction as "front side" or "front," the left direction in Figure 2(a) as "rear side" or "rear," the right direction in Figure 2(a) as "front side" or "front," the left direction in Figure 2(b) as "front side" or "front," and the right direction in Figure 2(b) as "rear side" or "rear." In the perspective views of Figures 5 and 7, the direction towards the viewer is defined as "front side" or "front," the rear direction as "rear side" or "rear," the left direction as "left side" or "left," and the right direction as "right side" or "right." In the perspective view of Figure 6, the direction towards the viewer is defined as "rear side" or "back," the direction towards the rear is defined as "front side" or "front," the direction to the left is defined as "right side" or "right," and the direction to the right is defined as "left side" or "left." In Figure 9, the direction to the left is defined as "front side" or "front," and the direction to the right is defined as "rear side" or "back."

Figure 1(a) is a plan view, Figure 1(b) is a side view, Figure 2(a) is a front view, and Figure 2(b) is a rear view. 1a is a linear base of a certain width installed on the floor surface G (the base 1a is made of metal), and a first through-hole 19 is formed through the first tip portion 1d of the base 1a in the front-rear direction (see Figures 1(b) and 2(a)). On the upper surface 1a' of the middle portion of the base 1a, a third through-hole 13a is opened in the front-rear direction in the semicircular portion 1b' on the left side (see Figures 1(a) and 3). The raised portion 1b is covered with a U-shaped angle 14 (see Figures 2(a) and 2(b)), and semicircular portions 14b, 14b are formed on both the right sides of the front side portion 14a and the rear side portion 14a. The angle 14 is made of metal (see Figures 1(a) and 2(b)).

In the semicircular portions 14b, 14b, a fourth through-hole 15a is opened in the semicircular portion 14b of the front side portion 14a at the position of the third through-hole 13a, and a fourth through-hole 15a is opened in the semicircular portion 14b of the rear side portion 14a at the position of the third through-hole 13a, in the front-rear direction (see Figures 1(a) and 3). The upper end portion 1c is aligned linearly in the left-right direction from the middle (middle portion) to the second tip portion 1e, which is at the same position as the first tip portion 1d, similar to the base portion 1a. The base portion 1a and the upper end portion 1c have the same width, and the first tip portion 1d and the second tip portion 1e are at the same position.

Furthermore, a straight upper end portion 1c, of the same constant width as the base portion 1a, is fitted into the inside of the U-shaped angle 14 (the front side portion 14a and the rear side portion 14a) from the middle (the middle portion) of the base portion 1a to the left. The upper end portion 1c is screwed into the upper surface 1c' of the upper end portion 1c by screws 16, 16 on the upper surface 14c of the angle 14, ensuring that the upper end portion 1c and the angle 14 never come apart. The upper end portion 1c is made of metal.

The third through-hole 13a and the fourth through-holes 15a, 15a are inserted in the front-rear direction by the support bolt 17, and a nut 17a is screwed onto the rear end of the support bolt 17 (see Figures 1 to 3). As a result, the upper end 1c, together with the angle 14, opens in the direction of arrow A (upward) with the support bolt 17 as the central axis (see Figure 4). The upper end 1c is also closed in the direction of arrow B, with the support bolt 17 as the axis, towards the base 1a. The upper end 1c, together with the angle 14, is pivotally supported on the base 1a with the support bolt 17 as the central axis, allowing it to open and close (it is provided to be openable and closable; see arrows A and B, see Figure 4). A second through-hole 20 is formed through the second tip 1e of the upper end 1c in the front-rear direction (see Figures 1(a), (b), and 2(a)).

The flange 6a of the coupling 6 has multiple bolt holes 11 (for example, 8). When the upper end 1c is opened in the direction of arrow A, the first through hole 19 in the base 1a and the second through hole 20 in the upper end 1c coincide with the center line r (see Figure 5) of the multiple bolt holes (for example, 8) (see Figure 5).

As shown in Figures 5, 6, and 9, the tool 1 for stopping the propeller shaft from rotating is placed on the floor surface G, with the first tip portion 1d and the second tip portion 1e positioned behind the flange 6a of the coupling 6a, in the one bolt hole 11 (11a) and the other bolt hole 11 (11b), so that the base portion 1a faces left and right.

Open the upper end portion 1c from the base portion 1a in the direction of arrow A (opening upwards around the pivot bolt 17), then insert the second bolt 21 through the second through hole 20 of the second tip portion 1e, and further insert the second bolt 21 through the single bolt hole 11 (11a) of the flange 6a from the rear side. A nut 21a is screwed onto the front end of the second bolt 21 from the front side. 24, 24 are washers (see Figures 5 and 9).

Furthermore, as shown in Figures 5 and 6, the first bolt 22 is inserted through the first through-hole 19 of the first tip portion 1d of the base portion 1a, and the first bolt 22 is inserted from the rear into every other bolt hole 11 of the flange 6a (into the other lower bolt hole 11 (11b)) (see Figure 6). A nut 22a is screwed onto the front end of the first bolt 22 from the front (see Figure 5). 24, 24 are washers (see Figure 6). This completes the tool 1 for preventing the propeller shaft 2 and the coupling 6 from rotating freely. The operation of the tool 1 for preventing the propeller shaft from rotating freely will now be explained.

As shown in Figures 5, 6, and 9, the base 1a of the tool 1 is placed on the floor surface G in a left-right direction behind the flange 6a of the coupling 6. The upper end 1c is opened in the direction of arrow A. The second through hole 20 of the second tip 1e of the upper end 1c is aligned with every other bolt hole 11 (11a) of the flange 6a of the coupling 6, from the rear of each bolt hole 11 (11a). The second bolt 21 is then inserted from the rear through the second through hole 20 and the bolt hole 11 (11a) via the washers 24, 24. The nut 21a is screwed onto the front end of the second bolt 21 from the front. This fixes the second bolt 21 in place (see Figure 5).

Furthermore, as shown in Figures 5 and 6, the base portion 1a of the tool 1 is placed on the floor surface G in a left-right direction on the rear side of the flange 6a of the coupling 6. The first through-hole 19 of the first tip portion 1d of the base portion 1a is aligned from behind the other bolt hole 11 (11b), and the first bolt 22 is inserted through the first through-hole 19 and the other bolt hole 11 (11b) from the rear, via the washers 24, 24. The nut 22a is then screwed onto the front end of the first bolt 22 from the front (see Figure 5). This secures the first bolt 22.

As a result, the propeller shaft 2 and the coupling 6 rotate integrally via the key 10. Since the coupling 6 is fixed to the flange 6a by the second bolt 21 and the first bolt 22 in the two bolt holes 11 (11a) and 11 (11b) of the flange 6a, the coupling 6 and the propeller shaft 2 do not rotate (slip).

Then, as shown in Figures 7 and 8, the hexagonal tip 23a of the hexagonal wrench 23 is inserted and fitted into the hexagonal nut 12, and the hexagonal wrench 23 is rotated in the direction of arrow C. Since the propeller shaft 2 and the coupling 6 are fixed by the tool 1, rotating the hexagonal wrench 23 in the direction of arrow C will not cause the propeller shaft 2 and the coupling 6 to rotate (spin freely).

The same procedure applies when loosening the hexagonal nut 12. Furthermore, as shown in Figures 7 and 8, the hexagonal tip 23a of the hexagonal wrench 23 is inserted and fitted into the hexagonal nut 12, and the hexagonal wrench 23 is rotated in the direction of arrow D. Since the propeller shaft 2 and the coupling 6 are fixed by the tool 1, even when the hexagonal wrench 23 is rotated in the direction of arrow D (loosening direction), the propeller shaft 2 and the coupling 6 will not rotate (spin freely).

As shown in Figure 11, in the case of a marine application, the base portion 1a of the tool 1 for stopping the propeller shaft from rotating is placed on the floor surface G (albeit slightly tilted), the upper end portion 1c and the second tip portion 1e are opened upwards (in the direction of arrow A, see Figure 4), the second through-hole 20 is aligned with the single bolt hole 11 (11a) on the rear side of the flange 6a, and the second bolt 21 is inserted through the second through-hole 20 and the single bolt hole 11 (11a) (see Figure 5). Then, the nut 21a is screwed onto the front end of the second bolt 21.

Furthermore, the first through-hole 19 in the first tip 1d of the base 1a of the tool 1 used to stop the propeller shaft from rotating is aligned with every other bolt hole 11, and the first bolt 22 is inserted through the first through-hole 19 and the other bolt hole 11(11b) of the flange 6 (see Figure 6). Then, the nut 22a is screwed onto the front end of the first bolt 22 (see Figure 5). This fixes the propeller shaft 2 and the coupling 6 using the tool 1.

Therefore, the hexagonal tip 23a of the hexagonal wrench 23 is inserted and fitted into the hexagonal nut 12, and the hexagonal wrench 23 is rotated in the direction of arrow C (the hexagonal wrench 23 is rotated in the direction of arrow C with a hammer) (see Figure 7). When this is done, since the propeller shaft 2 and the coupling 6 are fixed by the tool 1 (the tool 1 is fixed at the bottom surface G), the propeller shaft 2 and the coupling 6 will not rotate (spin freely) even when the hexagonal wrench 23 is rotated in the direction of arrow C.

The same procedure applies when loosening the hexagonal nut 12. The hexagonal tip 23a of the hexagonal wrench 23 is inserted and fitted into the hexagonal nut 12, and the hexagonal wrench 23 is rotated in the direction of arrow D (loosening direction) (the hexagonal wrench 23 is rotated in the direction of arrow D with a hammer). Since the propeller shaft 2 and the coupling 6 are fixed by the tool 1 (the tool 1 is fixed at the bottom surface G), even when the hexagonal wrench 23 is rotated in the direction of arrow D (loosening direction), the propeller shaft 2 and the coupling 6 will not rotate (spin freely) (see Figure 7).

When inserting the nuts 22a and 21a onto the front ends of the first bolt 22 and the second bolt 21, the first bolt 22 and the second bolt 21 are fixed to the flange 6a, which is convenient.

In the above embodiment, the tool 1 for preventing the propeller shaft from rotating freely was placed behind the flange 6a of the coupling 6 in the left-right direction (see Figure 5). However, the tool 1 for preventing the propeller shaft from rotating freely may also be placed in front of the flange 6a in the left-right direction.

In the above embodiment, the second bolt 21 and the first bolt 22 were inserted through the one bolt hole 11 (11a) and the other bolt hole 11 (11b) from the rear of the flange 6a of the coupling 6 (see Figure 5). However, the second bolt 21 and the first bolt 22 may also be inserted through the one bolt hole 11 (11a) and the second through hole 20, and through the other bolt hole 11 (11b) and the first through hole 19 from the front of the flange 6a. Naturally, the nuts 21a and 22a of the second bolt 21 and the first bolt 22 may be screwed in from the rear ends of the second bolt 21 and the first bolt 22 of the flange 6a.

In the above embodiment, the case in which the nut 17a is screwed onto the rear end of the support bolt 17 was described. However, the nut 17a may also be screwed onto the front end of the support bolt 17, inserted through the fourth through hole 15a, the third through hole 13a, and the fourth through hole 15a from the rear side (see Figures 1(a) and 1(b)).

In the above embodiment, if a tool 1 for preventing the propeller shaft from rotating freely is installed in the left-right direction behind the flange 6a of the coupling 6, the first bolt 22 and the second bolt 21 may be inserted from the front into the bolt holes 11 of the flange 6a, into one bolt hole 11 (11a) and the second through hole 20, and into the other bolt hole 11 (11b) and the first through hole 19. Naturally, the nuts 22a and 21a of the second bolt 22 and the first bolt 21 may be screwed in from the rear end.

Furthermore, the first bolt 22 has a nut 22a screwed into the first through hole 19 and the rear or front end of the other bolt hole 11 (11b), and the second bolt 21 has a nut 21a screwed into the second through hole 20 and the rear or front end of the one bolt hole 11 (11a), but it is not necessary to screw in the nuts 21a and 22a. That is, the first bolt 22 may simply be inserted into the first through hole 19 and the other bolt hole 11 (11b), and the second bolt 21 may simply be inserted into the second through hole 20 and the one bolt hole 11 (11a), and the first bolt 22 and the second bolt 21 do not need to be fixed in place. As a result, since the base 1a is installed on the floor surface G in the left-right direction, the first bolt 22 can be inserted into the first through hole 19 and the other bolt hole 11 (11b), and the second bolt 21 can be inserted into the second through hole 20 and the other bolt hole 11 (11a). Since the base 1a is installed on the floor surface G and fixed by the tool 1 that prevents the propeller shaft from rotating freely, the coupling 6 and the propeller shaft 2 can be prevented from rotating freely.

As described above, according to the present invention, with the base portion 1a installed on the floor surface G using the tool 1 to stop the propeller shaft from rotating freely, the upper end portion 1c is opened upward from the base portion 1a (in the direction of arrow A, see Figure 4), the upper end portion 1c aligns the second through hole 20 with the second tip portion 1e and the second through hole 20 with one bolt hole 11 (11a) of the flange 6a of the coupling 6, the second bolt 21 is inserted through the second through hole 20 and the one bolt hole 11 (11a), the first through hole 19 of the first tip portion 1d of the base portion 1a aligns the first through hole 19 with the other bolt hole 11 (11b), and the first bolt 22 is inserted through the first through hole 19 and the other bolt hole 11 (11b), thereby fixing the coupling 6 and the propeller shaft 2. Furthermore, the base 1a is installed on the floor surface G. Then, the hexagonal nut 12 is screwed onto the male screw 2b, and the hexagonal tip 23a of the hexagonal wrench 23 is fitted onto the hexagonal nut 12. By rotating in the direction of the arrow, the hexagonal nut 12 is tightened or loosened. This securely fixes the coupling 6 and the propeller shaft 2 using the tool 1 that prevents the propeller shaft from rotating freely. The tool 1 that prevents the propeller shaft from rotating freely allows the base 1a to be installed on the floor surface G, preventing it from being held by hand.

The nuts 22a and 21a are screwed into the front or rear ends of the first bolt 22 and the second bolt 21, respectively, in the one bolt hole 11 (11a) and the other bolt hole 11 (11b). Since the first bolt 22 and the second bolt 21 are fixed to the upper end 1c and the base 1a, the rotation (free rotation) of the coupling 6 and the propeller shaft 2 can be stopped by the tool 1 used to stop the propeller shaft from free-rotating.

The shaft hole 6c of the coupling 6 is tapered, and the tip portion 2a' of the propeller shaft 2 is tapered (tapered portion 2a). The shaft hole 6c and the tapered portion 2a of the propeller shaft 2 are configured to fit together. As a result, the shaft hole 6c (coupling 6) and the tapered portion 2a (propeller shaft 2) are securely fixed by the tool 1 used to stop the propeller shaft from rotating freely.

Furthermore, the pivot bolt 17 is pivotally supported, and the angle 14 and the upper end portion 1c are pivotally supported by the pivot bolt 17. The angle 14 and the upper end portion 1c are configured to open and close relative to the base portion 1a.

The tool for stopping the free rotation of a propeller shaft according to the present invention can stop the free rotation of the propeller shaft and the cup long, and has high industrial value.

1 Tool to stop the propeller shaft from spinning freely 1a Base 1a' Top surface 1b Raised part 1c Upper end 1c' Top surface 1d First tip 1e Second tip 2 Propeller shaft 2a Tapered part 2a' Tip 2b Male screw 2d Rear side 2d' Front side 6 Coupling 6a Flange 6c Shaft hole 6f Rear side 6f' Front side 10 Key 11 (11a, 11b) Bolt hole 12 Hexagonal nut 13a Third through hole 14 Angle 14a Front side part, rear side part 14b Semicircular part 15a Fourth through hole 16 Screw 17 Shaft support bolt 17a Nut 19 First through hole 20 Second through hole 21 Second bolt 21a Nut 22 First bolt 22a Nut G Floor surface

Claims (5)

In a tool for stopping a propeller shaft from rotating freely, the coupling has a shaft hole opening in the front-rear direction, a male screw is formed at the tip of the propeller shaft, the tip of the propeller shaft is inserted into the shaft hole, a hexagonal nut is screwed onto the male screw from the front of the coupling, a key is fitted between the shaft hole of the coupling and the propeller shaft, and multiple bolt holes are formed in the flange of the coupling,
The base is elongated in a straight line from left to right, with a first through-hole opening in the front-to-back direction at the first tip, and a U-shaped angle covering the raised portion on the upper surface in the middle, with the front and rear sides of the angle pivotally supported on the raised portion on both the right sides.
The upper end is fitted to the lower side of the angle of the raised upper part in the middle, and the upper end is aligned linearly from the middle to the second tip, which is at the same position as the first tip, in the same direction as the base, and the upper end has a second through hole opening in the front-to-back direction at the second tip.
The upper end and the angle are provided to be pivotally supported on the raised portion, allowing them to open and close relative to the base.
The base is placed on the floor in the left-right direction behind or in front of the flange of the coupling, and is opened upward with respect to the base by the axis on which the upper end and the angle are pivotally supported, and then the second through hole of the second tip of the upper end is aligned with one of the bolt holes of the flange of the coupling, and the second bolt is then inserted through the second through hole and the one bolt hole.
A tool for stopping a propeller shaft from rotating freely, characterized in that the first through-hole at the first tip of the base is aligned with the other bolt hole in the flange of the coupling, a first bolt is inserted through the first through-hole and the other bolt hole, and the base is installed on the floor surface. A tool for stopping the free rotation of a propeller shaft according to claim 1, wherein nuts are screwed onto the front or rear ends of the first bolt and the second bolt, respectively. The shaft hole described above is tapered, and is formed such that the diameter is larger at the rear and smaller at the front.
The tapered portion at the tip of the above-mentioned propeller shaft is tapered, with the diameter being larger at the rear and smaller at the front.
A tool for stopping a propeller shaft from rotating freely, according to claim 1 or 2, wherein the shaft hole and the tapered portion of the propeller shaft are configured to fit together. A tool for stopping the free rotation of a propeller shaft, according to claim 1 or 2, wherein a screw is screwed into the upper surface of the upper end of the angle as described above. The front and rear sides of the raised portion of the base have third through holes that penetrate them in the front-to-back direction.
The angle described above has semicircular sections formed on both the front and rear sides of the raised upper portion, and at the position of the third through hole, a fourth through hole is formed in the semicircular section on the front side and a fourth through hole is formed in the semicircular section on the rear side, passing through in the front-to-back direction.
There, a support bolt is inserted through both of the fourth through holes and the third through hole, and a nut is screwed onto the rear or front end of the support bolt.
A tool for stopping a propeller shaft from rotating freely, as described in claim 1 or 2, wherein the support bolt is pivotally supported, the angle and the upper end are pivotally supported by the support bolt, and the upper end is configured to open and close relative to the base.