JP6712456B2 - Combination shaft - Google Patents

Description

TECHNICAL FIELD The present invention relates to a combination shaft body capable of coaxially and detachably engaging a first shaft body and a second shaft body and connecting them as if they were one shaft body. Is.

Conventionally, when coaxially connecting pipes and extending the length thereof, for example, as shown in FIG. 9(a), the first pipe 1 and the second pipe 2 are butted to each other, and the end portions thereof are joined together. It is common that the pipe joints 3 fix each other and connect them (see Patent Document 1). As shown in FIG. 9(b), which is an exploded view of the vertical section of FIG. 9(a), this pipe joint 3 has a substantially C-shaped flexible section having an interrupt 4 parallel to the pipes 1 and 2. And a fixing member 7 for circumferentially tightening and fixing the flange portions 6 provided at both interruption ends thereof. According to this pipe joint 3, the interruption 4 of the joint main body 5 is opened in the circumferential direction, the ends of the pipes 1 and 2 wound with the rubber packing 8 are inserted, and in this state, the fixing member 7 is fitted to the flange portion 6. The pipes 1 and 2 can be easily connected and fixed only by inserting and tightening.

However, in such a joint structure, since the pipe joint 3 protrudes laterally from the outer peripheral surfaces of the pipes 1 and 2, when the connected pipes 1 and 2 are taken in and out of a predetermined pipe line or the like, the protruding portion thereof is There is a problem that it is easily caught and the workability is poor. In addition, the protruding portion may hit the pipe or the like and be damaged.

Therefore, rather than butt the pipes together and tightening the butted part from the outside with a pipe joint, you can simply connect the two by simply inserting them between the pipes. Various joints have been proposed (see Patent Document 2).

As shown in FIG. 10, this joint 10 is made of a resin pipe or a resin round bar having an outer diameter that can be inserted into the inside of a pipe 11 to be connected, and elongated slits 12 extending in the axial direction are provided at both ends thereof. Has been. In addition, a protrusion 13 having a circular top surface is provided on the outer peripheral surface of the both ends thereof where there is no notch 12. On the other hand, the pipe 11 to be connected is formed with a hole 14 into which the protrusion 13 is inserted.

According to this joint 10, by inserting one end of the joint 10 into the end opening of the pipe 11, the protrusion 13 can be inserted into the hole 14 and engaged therewith, and cannot be pulled out even if pulled in the axial direction. It is like this. Then, when one of the joint 10 and the pipe 11 is fixed and the other is rotated in the circumferential direction, the protrusion 13 is displaced from the hole 14 and disengaged from each other, so that the two are separated from each other.

JP, 2011-89567, A JP, 2011-79291, A

Certainly, according to the joint 10, the joint 10 does not project laterally from the outer peripheral surface of the pipe 11 to be connected, and in that respect, it is easier to handle than the joint structure shown in FIG. Becomes

However, the joint 10 is provided with the notches 12 at both ends thereof, and it is premised that each of the both ends is lazy in the direction in which the notches 12 are closed, so that the connecting portion with the pipe 11 is weak in strength. , When the load is applied from the side, the connecting part may be bent or broken. Therefore, there is no problem in using the joint 10 for connecting a protective tube of a cable or the like, but for example, a support for supporting a shelf or the like, a hook extending horizontally from a vertical surface to hang a hanger, etc. However, it cannot be used for applications that require load.

On the other hand, in the columns that support shelves, the spacing between the shelves and the number of shelves can be easily changed according to the size of the space and the type of articles to be placed on the shelves. It is desired to add a stretch function. In addition, it is desired that a hook for hanging a hanger or the like be capable of expanding and contracting the length of the hook according to the type and number of things to be hung on the hook.

Therefore, like the joint 10, there is required a connecting structure in which a plurality of pipes or rods can be detachably connected as if they were one shaft and the connecting portion has a stable strength. However, the fact is that such a thing has not been developed yet.

The present invention has been made in view of such circumstances, and it is as if the first shaft body and the second shaft body are coaxially and detachably engaged with each other as if they were one shaft body. It is an object of the present invention to provide a combination shaft body that is connected to a shaft and has a high strength at its connecting portion and can stably maintain a coaxial connecting structure.

In order to achieve the above-mentioned object, the present invention has a resin-made first shaft body having a substantially cylindrical peripheral wall, and a substantially cylindrical peripheral wall having the same outer diameter as that of the first shaft body. A second shaft body made of resin, which is coaxially and detachably engaged with one end side of the first shaft body and serves as an extension portion of the first shaft body, the first shaft body Has a through hole formed in a peripheral wall on one end side thereof, and the second shaft body can be coaxially inserted into an opening on one end side of the first shaft body from an opening edge on one end side thereof. A small-diameter tubular portion is extended, and only one cutout portion is formed in the circumferential direction in the small-diameter tubular portion. The cutout portion extends from the opening tip of the small-diameter tubular portion toward the root portion. A substantially band-shaped notch extending in the direction, and a protrusion is formed on the outer peripheral surface of the tip of one of the both side edges of the notch, and the small-diameter tubular portion of the second shaft body is In the state in which it is inserted into the opening on the one end side of the first shaft body, the projection of the small-diameter cylindrical portion enters into the through hole of the first shaft body, and the first shaft body and the second shaft body are coaxial. A combination shaft body in which the positive engagement is stably held and the first shaft body and the second shaft body are coupled as if they were one shaft body. The summary is 1.

In particular, in the present invention, R (R) is attached to both side portions in the circumferential direction of the shaft body among the opening edge portions which are open to the inner peripheral surface side of the peripheral wall of the through hole in the first shaft body. A second aspect of the present invention is a combination shaft body which is provided with R (R) on both sides in the circumferential direction of the small-diameter tubular portion of the peripheral portion of the top surface of the protrusion formed on the small-diameter tubular portion.

Furthermore, in the present invention, among them, in particular, in the outer peripheral surface of the small-diameter cylindrical portion of the second shaft body, in the axial direction, in the vicinity of the edge portion of the notch portion where the protrusion is not formed, A third aspect of the present invention is a combination shaft body having an extending ridge.

And in this invention, especially among them, the notch part of the small diameter cylinder part extended from the said 2nd shaft body WHEREIN: 60 to 60 degrees with respect to the whole circumference 360 degree is the front end opening edge of a small diameter cylinder part. The fourth gist is a combination shaft body that is cut out at an angle width of 150°.

According to the present invention, it is possible to coaxially and detachably engage a substantially cylindrical first shaft body and a second shaft body, both of which are made of resin and have peripheral walls having the same outer diameter with each other, as if they were one. Is a combination shaft body that can be extended like a long shaft body, and a through hole is formed on the first shaft body side. Further, the second shaft body is provided with a small-diameter cylinder portion extending into one end side of the first shaft body, and a part of the small-diameter cylinder portion is axially cut out so that only one is provided in the circumferential direction . A substantially strip-shaped notch is formed. A protrusion is formed on one side of the edge of the cutout, and the small-diameter cylindrical portion of the second shaft is inserted into the opening on the one end side of the first shaft to connect them together. The projection is adapted to enter the through hole on the side of the first shaft body.

According to this structure, when the first shaft body and the second shaft body are connected to each other, the peripheral wall of the small-diameter cylindrical portion extended to the second shaft body is formed inside by the projection near the cutout portion. Is pushed into the first shaft body in a state of being reduced in diameter, the projection is inserted in the through hole on the side of the first shaft body, and the peripheral wall of the small-diameter tubular portion is expanded in diameter to return to the original state. The inner surface of the shaft will be guided from the inside. Therefore, the coaxial connection between the first shaft body and the second shaft body is stably maintained with high strength, and even if a force is applied to this connection portion from the side, this portion bends. There is no twist.

Further, among the combination shaft bodies of the present invention, in particular, among the opening edge portions that open to the inner peripheral surface side of the peripheral wall of the through hole in the first shaft body, R (R) is provided on both sides in the circumferential direction of the shaft body. Is attached, or among the top surface peripheral edge portions of the projections formed on the small-diameter cylindrical portion, R (R) is attached to both sides in the circumferential direction of the small-diameter cylindrical portion, the projection is inserted into the through hole. At the time of making it possible, the projection can be smoothly inserted into the through hole by simply rotating the first shaft body and the second shaft body relatively, which is preferable.

Further, among the combined shaft bodies of the present invention, in particular, of the outer peripheral surface of the small-diameter tubular portion of the second shaft body, the shaft is provided along the edge portion of the cutout portion on which the protrusion is not formed. In the case where a ridge extending in the direction is formed, of the edges of the cutout, the side with the protrusion is relatively thin and has a high degree of freedom, and the side without the protrusion has a limited degree of freedom due to the ridge. Since the strength is increased, the coaxiality between the first shaft body and the second shaft body can be more stably maintained at the connecting portion.

Further, among the combined shaft bodies of the present invention, in particular, the cutout portion of the small-diameter cylindrical portion extending from the second shaft body has the tip opening edge of the small-diameter cylindrical portion at 60° with respect to the entire circumference of 360°. A notch having an angular width of up to 150° has a good balance between the ease with which the protrusions enter the through hole and the reinforcing function of the connecting portion by the small-diameter cylindrical portion, and a more excellent connecting structure can be obtained.

It is a perspective view showing one embodiment of the present invention. (A) is a front view of the first shaft body used in the above embodiment, (b) is a right side view of (a), (c) is a left side view of (a), and (d) is (a). ) Is a plan view of FIG. 2A is a sectional view taken along the line AA′ of FIG. 2D, and FIG. 2B is a sectional view taken along the line BB′ of FIG. (A) is a front view of the second shaft body used in the above embodiment, (b) is a right side view of (a), (c) is a left side view of (a), and (d) is (a). (A) is a plan view, (e) is a sectional view taken along the line CC′ of (d), and (f) is a sectional view taken along the line DD′ of (d). (A) is a partial cross-sectional view showing the connection structure in the above embodiment, and (b) is a cross-sectional view taken along the line EE' of (a). It is a fragmentary sectional view showing an example of use of the above-mentioned embodiment. It is a perspective view which shows the whole of the said usage example. It is explanatory drawing which shows the other usage example of the said embodiment. (A) is a perspective view which shows an example of the conventional pipe joint, (b) is explanatory drawing which shows the longitudinal cross section of (a). It is a perspective view which shows the other example of a prior art.

Next, a mode for carrying out the present invention will be described. However, the present invention is not limited to the following embodiments.

FIG. 1 is an example in which a combination shaft body according to an embodiment of the present invention is applied to four columns 20 of a display stand as shown in FIG. 7. That is, this combined shaft body is composed of the first shaft body 21 and the second shaft body 22, and the first shaft body 21 supports the shelf plate 51 on the base plate 50 at a predetermined height. The second shaft body 22 is used as a support pillar body for receiving, and is used as an extension pillar that is connected to the first shaft body 21 and projects upward from the shelf plate 51.

The first shaft 21 is shown in FIG. 2 [(a) is a front view thereof, (b) is a right side view of (a), (c) is a left side view of (a), and (d) is (a)). )] and FIG. 3 [(a) is a sectional view taken along the line AA' of FIG. 2(d), and FIG. 3(b) is a sectional view taken along the line BB' of FIG. 2(d)]. It is made of a substantially cylindrical ABS (acrylonitrile-butadiene-styrene copolymer, the same applies hereinafter), and is provided with a large-diameter flange portion 23 at its lower end so that a stable upright posture can be achieved. The thickness of the peripheral wall becomes thicker toward the bottom.

Further, a through hole 24 is formed on the peripheral wall of the first shaft body 21 at a position a predetermined distance W from the upper edge on the right side, and the through hole 24 has a second shaft to be described later. The protrusions 35 provided on the body 22 side are adapted to enter. The peripheral edge portion of the through hole 24 on the outer peripheral surface side of the peripheral wall is gently recessed in the vertical direction (axial direction), and when the through hole 24 is viewed from the front, a curved surface 25 having an elliptical contour that is long in the vertical direction. It has become.

A groove 26 extending in the axial direction is provided on the upper left edge of the peripheral wall of the first shaft body 21 on the left side, and a small projection protruding upward on the upper edge on the right side. 27 are provided. The groove 26 and the small protrusion 27 serve as an engaging portion for attaching the shelf plate 51 to the upper end portion when the first shaft body 21 is used as a main body of the display stand shown in FIG. 7. Similarly, on the lower part of the peripheral wall of the first shaft body 21, four protrusions 28 extending in the axial direction are provided at equal intervals, and this portion is the base plate of the display stand shown in FIG. At the time of engagement with 50, the first shaft body 21 functions to prevent rotation so as not to rotate in the circumferential direction.

On the other hand, the second shaft body 22 is shown in FIG. 4 (a), its front view, (b) is a right side view of (a), (c) is a left side view of (a), and (d) is. (A) is a plan view, (e) is a sectional view taken along the line CC′ of (d), and (f) is a sectional view taken along the line DD′ of (d)]. It is formed of a molded body, and its peripheral wall has the same outer diameter as the peripheral wall of the first shaft body 21. Then, the internal space is vertically divided by a partition piece 30 provided at a substantially intermediate portion in the axial direction. In the upper part of the partition, the diameter of the hollow part 31 is small and the thickness of the peripheral wall is thick, and similarly, in the lower part, the diameter of the hollow part 32 is large and the thickness of the peripheral wall is thinner than the upper part. ing. The strength of the entire second shaft body 22 is sufficiently ensured by the peripheral wall having the two levels of thickness.

In addition, a shallow counterbore 31a having a diameter larger than that of the hollow portion 31 is formed on the upper end surface of the second shaft body 22, and three vertical ribs are formed on the inner peripheral surface thereof at equal intervals in the circumferential direction. 31b is provided. A part of the inner peripheral surface of the counterbore 31 bulges inward to form a vertical surface 31c. The vertical rib 31b and the vertical surface 31c are engaged with the shaft portion (see FIGS. 6 and 7) of the decoration tool 60 inserted from the upper end portion of the second shaft body 22, and the decoration tool 60 is It is designed to prevent rotation in the circumferential direction.

Further, the second shaft body 22 is provided with a small-diameter cylindrical portion 33 that can be inserted into the upper end opening 40 (see FIG. 1) of the first shaft body 21 coaxially from the lower end opening edge 22a. Has been done. Further, only one notch 34 is formed in the circumferential direction from the opening tip of the small diameter cylindrical portion 33 toward the root side (the lower end opening edge 22a side of the second shaft body), and the notch 34 The reference numeral 34 has a shape extending in a substantially belt shape in the axial direction (specifically, a substantially belt shape whose width becomes slightly narrower toward the root side). Due to the cutout portion 34, the small-diameter cylindrical portion 33 has a substantially C-shaped cross section in the direction perpendicular to the axis [see FIG. 5(b)].

Further, a columnar projection 35 having a circular outer shape when viewed from the front is formed on the outer peripheral surface of the tip of one of the both side edges of the cutout portion 34 of the second shaft body 22. [See FIGS. 4(b) and 4(e)]. The projection 35 is a through hole provided in the peripheral wall of the first shaft body 21 in a state where the small diameter cylindrical portion 33 of the second shaft body 22 is inserted into the upper end opening 40 of the first shaft body 21. It is designed to enter 24 from the inside.

Further, in the outer peripheral surface of the small-diameter cylindrical portion 33 of the second shaft body 22, in the vicinity of the edge portion of the notch portion 34 on which the protrusion 35 is not formed, a ridge extending axially in a belt shape. 36 is formed. The projection 36 serves as a reinforcing guide for the operation of bending the peripheral wall of the small-diameter cylindrical portion 33 by the notch portion 34 to reduce the diameter thereof or return to the original diameter.

Therefore, the small-diameter cylinder portion 33 extending from the second shaft body 22 is inserted into the upper end opening 40 of the first shaft body 21, and the projection 35 provided on the small-diameter cylinder portion 33 is attached to the first shaft. By inserting it into the through hole 24 provided in the body 21, the two can be coaxially connected as if they were one shaft body. The connection is very stable, and even if a relatively large load is applied from the side, the connection is not bent or distorted, and the coaxiality can be stably maintained. Further, since this connecting portion has no projection in the circumferential direction, it becomes like a single shaft as a whole, which is convenient.

FIG. 5( a) showing an enlarged vertical cross section of the connecting portion of the connecting portion between the first shaft body 21 and the second shaft body 22 and a view further showing the EE′ cross section thereof. This will be described in more detail using 5(b). That is, a shallow groove 41 extending in the axial direction opposite to the through hole 24 is provided on the inner peripheral surface of the portion of the first shaft body 21 into which the small-diameter cylindrical portion 33 extending from the second shaft body 22 enters. The ridges 36 provided on the small-diameter cylindrical portion 33 are fitted exactly in the groove 41.

Similarly, on the inner peripheral surface of the portion of the first shaft body 21 into which the small-diameter cylindrical portion 33 extending from the second shaft body 22 enters, a predetermined width in the circumferential direction from the side where the opening edge 24a of the through hole 24 is located. A region [indicated by P in FIG. 5(b)] is a concave portion 42 that is tapered in such a manner that the thickness of the peripheral wall is gradually reduced from the opening edge 24a side. A region Q on the opposite side of the concave surface portion 42 by approximately 180° is a concave surface portion 43 that is tapered in a tapered shape such that the thickness of the peripheral wall is gradually reduced from one end side thereof, like the concave surface portion 42.

The two concave surface portions 42 and 43 serve to guide the insertion of the small diameter cylindrical portion 33 extending from the second shaft body 22 into the upper end opening 40 of the first shaft body 21, When inserting the small-diameter cylindrical portion 33 from the upper end opening 40 of the first shaft body 21, the small-diameter cylindrical portion 33 is aligned with the orientation of the projection 35 on the second shaft body 22 side so that the through hole 24 is open. Even if is inserted, the position may shift. In that case, the small-diameter cylindrical portion 33 enters into the side of the concave portions 42 and 43 where the concave portion is deeply formed, in which the protrusion 35 and the protrusion 36 protruding to the peripheral surface are easily inserted.

Therefore, when the small-diameter cylindrical portion 33 is rotated toward the direction in which the concave portion becomes shallower, the small-diameter cylindrical portion 33 moves while shrinking along the bottom surface of the concave portion of the tapered strips of the concave surface portions 42 and 43, resulting in a feeling of snapping. At the same time, the protrusion 35 enters the through hole 24, and the protrusion 36 enters the shallow groove 41. Then, the entire small diameter cylindrical portion 33 expands to return to the original size and presses the inner peripheral surface of the first shaft body 21, so that the engagement therebetween becomes very stable.

Even if the small-diameter cylindrical portion 33 is rotated toward the concave portions 42 and 43 in which the concave portions are deeply formed, the projections 35 and the ridges 36 hit the deep end surfaces of the concave portions 42 and 43, respectively. Has become. Therefore, by rotating the small-diameter cylindrical portion 33 so that it can easily rotate, the protrusion 35 can be efficiently inserted into the through hole 24. Then, when the connection is released, the small diameter cylindrical portion 33 is rotated in the same direction as the connection, so that the projection 35 and the ridge 36 are moved to the deeper side of the concave portions 42 and 43. If the second shaft body 22 is pulled up in this state, it can be easily pulled out from the upper end opening 40 of the first shaft body 21.

The combination shaft body including the first shaft body 21 and the second shaft body 22 is used as the support column 20 that supports the shelf plate 51 on the base plate 50 in the display stand shown in FIG. 7. The mounting method will be described below.

First, the base plate 50 and the shelf plate 51 are prepared. As shown in FIG. 6, on the upper surface of the base plate 50, as shown in FIG. 6, bosses 70 for erecting the first shaft body 21 of the pillar 20, which is the pillar body, are integrally formed. The outer shape of the boss 70 is substantially frustoconical, and a small diameter hole portion 71 and a large diameter hole portion 72 are provided to receive the lower portion of the first shaft body 21 provided with the flange 23. A concave groove 73 is provided on the inner peripheral surface of the small-diameter hole portion 71, which engages with the four protrusions 28 provided on the lower outer peripheral surface of the first shaft body 21 and serves as a detent. Has been.

Further, on the lower surface of the shelf plate 51, downward bosses 75 for engaging with the upper portion of the first shaft body 21 are integrally formed at the four corners thereof. An upward boss 76 for engaging with the lower portion of the second shaft body 22 connected to the first shaft body 21 is integrally formed on the upper surface of the shelf board 51 coaxially with each downward boss 75. Has been formed.

Further, on the inner peripheral surface of the boss hole of the downward boss 75, there is a protrusion 78 for engaging with the concave groove 26 [see FIG. 2(c)] provided in the upper portion of the first shaft body 21. It is provided. Further, an annular projection 79 that abuts on the upper end surface of the first shaft body 21 is provided on the inner peripheral surface that is a boundary portion between the downward boss 75 and the upward boss 76, and the annular projection 79 is provided at one place. The cutout 79a is engaged with the small protrusion 27 [see FIG. 2B] protruding upward from the upper end surface of the first shaft body 21. The upper end of the first shaft body 21 moves in the circumferential direction with respect to the shelf plate 51 by the engagement between the groove 26 and the protrusion 78, and the engagement between the notch 79a of the annular protrusion 79 and the small protrusion 27. It is designed so that it will not be twisted.

The first shaft body 21 is attached to the base plate 50 by inserting the first shaft body 21 into the bosses 70 at the four corners of the base plate 50 from the lower side thereof, respectively, and then inserting the small-diameter hole portion 71 of the boss 70. By engaging the lower portion of the first shaft body 21 with the large diameter hole 72. As a result, the first shaft body 21 can be vertically stood at the four corners of the base plate 50 in a stable posture.

Next, the upper end portions of the four first shafts 21 and the downward bosses 75 provided at the four corners of the shelf plate 51 are engaged with each other to attach the shelf plate 51. The shelf 51 is stably supported by the four first shafts 21.

Then, the small-diameter cylindrical portion 33 (see FIG. 1) extended from the second shaft body 22 is inserted into the boss holes of the upward bosses 76 provided at the four corners of the shelf plate 51, and as described above, By inserting the projection 35 provided on the small-diameter cylindrical portion 33 into the through hole 24 provided on the peripheral wall of the first shaft body 21, the second shaft body 22 is moved to the upper end portion of the first shaft body 21. Can be connected coaxially. This connecting portion is stable and the shelf plate 51 does not wobble.

Then, as shown in FIG. 7, a crescent moon, a star-shaped decorative tool 60 is inserted into two of the four second shafts 22 projecting from the shelf plate 51 on the inner side by inserting the decoration tool 60. , Decorate this display stand. Further, in the center of the shelf board 51, a display tool 61 for displaying the catchphrase and the product description of the product displayed on the display stand is placed. In this way, the display stand shown in FIG. 7 can be obtained.

As shown in FIG. 6, the shaft portion of the decoration tool 60 has a shape that conforms to the shape of the inner peripheral surface of the second shaft body 22 on the upper side [see FIGS. 4(e) and 4(f)]. It is shaped so as to engage with the three vertical ribs 31b and the vertical surface 31c in the counterbore 31a of the second shaft body 22. Therefore, the decoration tool 60 is prevented from rotating in the circumferential direction by the engagement of the shaft portion thereof, and the surface of the decoration tool 60 to be shown is always directed to the front of the display stand.

According to the display stand, as shown in FIG. 7, products are displayed on the upper surface of the base plate 50, and the second shaft body 22 which is an extension pillar protruding from the shelf plate 51 is used on the shelf plate 51. By making appropriate decorations, a display with a good appearance can be realized. Further, the support column 20 formed by connecting the first shaft body 21 and the second shaft body 22 has its coaxiality as if it were one, and the hand is easy when the product is taken in and out. Even if the shelf plate 51 or the support column 20 is touched, there is no rattling.

Further, in the above display stand, when it is desired to arrange short products on the shelf board 51 and to further provide another shelf board thereon, as the shelf board, the second shaft body is provided at the four corners of the lower surface thereof. 22 is provided with protrusions that enter the opening of the upper end surface of the second shaft 22, or annular projections that are fitted onto the upper end portion of the second shaft body 22 are provided at the four corners of the lower surface thereof. Then, the display surface can be increased by attaching the shelf plate using the upper end portion of the second shaft body 22. Further, when the products to be lined up on the base plate 50 are tall, by connecting the first shaft body 21 and the second shaft body 22 and then attaching the shelf plate as described above, a tall display can be obtained. It can also be used as a stand.

In the above example, the projection 35 provided on the small-diameter cylindrical portion 33 extending from the second shaft body 22 has a circumferential portion on both sides in the circumferential direction of the small-diameter cylindrical portion 33 in the peripheral portion of the protruding top surface [see FIG. It is preferable that the portion indicated by the small circle X in b)] is attached with R (R). That is, when the R is attached, when the first shaft body 21 and the second shaft body 22 are connected, the small-diameter cylindrical portion 33 inserted inside the first shaft body 21 is rotated in the circumferential direction. This is because the operation of causing the projection 35 to enter the through hole 24 can be smoothly performed, and the load on the small diameter cylindrical portion 33 can be reduced.

Further, instead of attaching R to the protrusion 35, portions of the opening on the inner peripheral surface side of the peripheral wall of the through hole 24 of the first shaft body 21 on both sides in the circumferential direction of the shaft body 21 [small circle Y in FIG. 5(b)]. It is preferable to add R to the portion shown in [1] because the same effect can be obtained. Of course, R may be attached to both the protrusion 35 and the through hole 24.

Further, in the above example, the degree of the notch of the notch portion 34 provided in the small-diameter tubular portion 33 extending from the second shaft body 22 with respect to the entire circumference (360°) of the tip opening edge of the small-diameter tubular portion 33. It is preferable to make a notch with an angular width of 60 to 150° [shown by θ in FIG. 5( b )], and more preferable to make a notch with an angular width of 90 to 120°. That is, if the angular width of the cutout portion 34 is too small, the amount of bending due to the diameter reduction of the small diameter cylindrical portion 33 becomes small, and it becomes difficult for the projection 35 to enter the through hole 24. Further, if the angular width of the cutout portion 34 is too large, the reinforcing action of the small-diameter cylindrical portion 33 for guiding the connecting portion from the inside of the first shaft body 21 may be weakened.

In the above example, the notch 34 is gradually narrowed toward the root side, but this is because the tip side has a greater degree of freedom than the root side of the small diameter cylindrical section 33. It has been taken into consideration. However, it is not always necessary to have such a shape, and the width of the cutout portion 34 may be the same width at the tip side and the root side.

In the above example, the protrusion 36 is provided in the vicinity of one edge of the notch 34 of the small-diameter cylindrical portion 33 so as to perform the guiding function of this portion. 36 is not always necessary.

Further, in the above example, the peripheral portion of the through hole 24 provided on the peripheral wall of the first shaft body 21 on the peripheral wall outer peripheral surface side is the curved surface 25 that is gently recessed in the vertical direction. When the first shaft body 21 and the second shaft body 22 are disconnected from each other, one of the two shaft bodies 21 and 22 is relatively rotated in the circumferential direction to release the connection. When the projection 35, which is inserted into the through hole 24, is pushed inward from the outside of the first shaft body 21 and the engagement is released to release the connection, It is a consideration.

However, when such a movement is not performed and the small diameter cylindrical portion 33 is rotated in the circumferential direction to disconnect the connection as described above, it is not necessary to provide the curved surface 25 as described above. Further, in the protruding peripheral portion of the top surface, R is provided on both sides in the axial direction (vertical direction in FIG. 1) of the small-diameter cylindrical portion 33, or in the opening of the through hole 24 on the inner peripheral surface side of the peripheral wall, When the peripheral side edges on both sides in the direction are rounded, the first shaft body 21 and the second shaft body 22 are axially aligned with each other without pushing the projection 35 that has entered the through hole 24 from the outside. Similarly, it is not necessary to provide the curved surface 25 as described above, because the engagement can be easily disengaged by simply pulling it away.

Further, in the above example, the concave portions 42 and 43 are provided on the inner peripheral surface of the upper portion of the first shaft body 21 so that the projections 35 and the protrusions 36 of the small-diameter cylindrical portion 33 are located inside the first shaft body 21. Although consideration is given to the smooth movement, as described above, the top edge of the protrusion 35 or the opening edge of the through hole 24 is provided with R, and the first shaft body 21 and the second shaft body are On the contrary, when the engagement can be easily released by pulling the two axially away from each other, the two shaft bodies 21 and 22 can be simply coaxially butted and connected to each other to easily form the through hole 24. The protrusion 35 can be inserted therein. Therefore, the operation of rotating the small-diameter cylindrical portion 33 in the first shaft body 21 in the circumferential direction at the time of connection becomes unnecessary, and the concave surface portions 42 and 43 do not need to be provided.

However, as shown in FIG. 7 of this example, when connecting the second shaft body 22 with the shelf plate 51 attached to the upper end portion of the first shaft body 21, the first shaft body 21 side Since the through hole 24 provided in the is difficult to see behind the shelf plate 51, as in the above example, the position where the small diameter cylindrical portion 33 is easily inserted is sought and inserted into the first shaft body 21, and then the concave surface portion is formed. It is preferable to move the protrusions 35 in the circumferential direction along the lines 42 and 43 for connection so that the connection work can be performed smoothly.

In the above example, the flange 23 and the protrusion 28 provided on the lower portion of the first shaft body 21 and the recessed groove 26 and the small protrusions 27 provided on the upper portion are all shown in FIG. It is provided for engagement with the base plate 50 and the shelf plate 51 for application to a display stand, and is not always necessary. Similarly, the configuration of the counterbore hole 31a and the like provided on the upper portion of the second shaft body 22 is also provided for attaching the decorative tool 60 for display to this portion, and is not necessarily required.

Further, the present invention is not limited to the combination of the two shaft bodies of the first shaft body 21 and the second shaft body 22 as in the above example, and the length is adjusted in the middle thereof. As the shaft body, one or a plurality of shaft bodies each having a through hole 24 at one end side and a small diameter cylindrical portion 33 extending at the other end side may be connected.

An example thereof is shown in FIG. This is an example in which the present invention is applied to a hanger hook attached to a wall surface of a store or the like. The hanger hook includes a base shaft body 80 having substantially the same structure as the first shaft body 21, and an intermediate shaft body 81 having a small diameter cylindrical portion 33 extending from one end and a through hole 24 provided on the opposite side. , A tip shaft body 84 integrally provided with a small-diameter cylindrical portion 33 on one end side and a plate 83 serving as a hanger stop on the opposite side, which is a combination of three types of shaft bodies. The connection structure of the small-diameter cylindrical portion 33 and the through hole 24 is the same as in the above example, and the description thereof is omitted.

The base portion of the base shaft 80 is detachably fixed to the boss 85 mounted on the wall surface by screw engagement. Then, by inserting the small-diameter cylindrical portion 33 extending from the intermediate shaft 81 into the tip opening and inserting the projection 35 into the through hole 24, the intermediate shaft 81 and the base shaft 80, as if It is connected like a shaft of a book. Then, by inserting the small-diameter cylindrical portion 33 extending from the tip shaft body 84 into the tip opening and inserting the projection 35 into the through hole 24, the tip shaft body 84 is moved to the base shaft body 80 and the intermediate shaft body. 81 and is connected as if it were one shaft. In this way, it is possible to obtain a hanger hook having a relatively long portion for hanging the hanger.

According to this hanger hook, the hanger can be smoothly slid back and forth because it is like a single shaft even though there is a connecting part at the part on which the hanger is hung. When the number of hangers to be hung is small, the intermediate shaft 81 can be removed and the tip shaft 84 can be directly connected to the base shaft 80 to shorten the entire length. In addition, if a plurality of the intermediate shafts 81 are prepared, the length can be appropriately changed according to the number of hangers to be hung and the volume of the hangers to be hanged, which is convenient.

In this way, the combined shaft body of the present invention can connect a plurality of shaft bodies as if they were one shaft, and since the coaxiality of the connecting portion is stably maintained, the shaft length is reduced. It can be widely used in various applications where it needs to be stretched as needed.

Further, the material of each shaft forming the above-mentioned combination shaft is not limited to the ABS resin as in the above example, and any resin may be used as long as it has moldability and flexibility. It may be present, and a resin made of an appropriate resin is used depending on the application.

According to the present invention, the first shaft body and the second shaft body are coaxially and removably engaged with each other to be connected as if they were one shaft body, and the strength of the connecting portion is high. It can be used for a combination shaft body which can stably maintain a high and coaxial connection structure.

21 1st shaft body 22 2nd shaft body 24 Through hole 33 Small diameter cylinder part 34 Notch part 35 Protrusion 40 Upper end opening

Claims (4)

A first shaft body made of resin having a substantially cylindrical peripheral wall, and a peripheral wall having the same outer diameter as that of the first shaft body, which is also substantially cylindrical, and coaxial with one end side of the first shaft body. And a second shaft body made of resin, which is engaged with each other in a detachable manner and serves as an extension of the first shaft body,
The first shaft body has a through hole formed in the peripheral wall on one end side thereof,
Said second shaft is coaxially from an opening edge of the one end, the small diameter cylinder portion can be inserted into one end of the opening of the first shaft member is extended, the smaller-diameter tubular portion circumferential There is only one notch in the direction ,
The cutout portion is a substantially strip-shaped cutout portion that extends in the axial direction from the opening tip of the small-diameter tubular portion toward the root portion, and the tip outer peripheral surface of one of the two side edge portions of the cutout portion. There is a protrusion on the
With the small-diameter cylinder portion of the second shaft body inserted into the opening on the one end side of the first shaft body, the projection of the small-diameter cylinder portion enters the through hole of the first shaft body, The coaxial engagement between the first shaft body and the second shaft body is stably held, and the first shaft body and the second shaft body are connected as if they were one shaft body. A combination shaft body characterized by being designed. Of the opening edge portions that open to the inner peripheral surface side of the peripheral wall of the through hole in the first shaft body, R (R) is attached to both sides in the circumferential direction of the shaft body, or is formed in the small-diameter cylindrical portion. The combination shaft body according to claim 1, wherein R (R) is attached to both circumferential side portions of the small-diameter cylindrical portion of the peripheral portion of the top surface of the protrusion. 3. A ridge extending in the axial direction is formed in the outer peripheral surface of the small-diameter tubular portion of the second shaft body in the vicinity of the edge of the cutout portion where the protrusion is not formed. The described combination shaft. The cutout portion of the small-diameter cylindrical portion extending from the second shaft body cuts out the front end opening edge of the small-diameter cylindrical portion with an angular width of 60 to 150° with respect to the entire circumference 360°. The combination shaft body according to any one of 1 to 3.

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