JP2008148997A - Furniture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair in which a back support rod 3 and a back support rod connection part 54 can easily be engaged and conneced mutually, and further can be readily fastened with a screw a direction orthogonal to a connection direction. <P>SOLUTION: A back support rod connection part 54 is provided with a nut storage part 154 capable of inserting a nut 8 from a direction intersecting the connection direction, the nut 8 is stored in the nut storage part 154 along the connection direction in a state that it is freely suspendable and prevented from rotating. A screw hole 8a faces a first bolt passing part 54b provided on the side of a bottom part 154a of the nut storage part 154 and then the back support rod 3 is fitted outside so as to close the nut storage part 154, the bolt 9 is inserted through a second bolt passing part 135 provided for a part corresponding to the nut of the back of the support rod connection part 54, is passed through the first bolt passing part 54d, and the nut 8 is threadedly-engaged and tightened with each other. Thus, a dividing force F in the direction different from the tightening direction is generated between the nut 8 and the nut storage part 154 to connect the back support rod connection part 54 with the back support rod 3 while drawing them. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to furniture such as a chair used in an office or the like, and relates to furniture provided with a structure in which members constituting the furniture can be reliably fitted and connected through a simple operation.

When fitting the members together and pulling between the two members together, a screw hole member is provided inside one member, a screw passage is provided inside the other member, and these are fitted, It is customary to connect the two members together by screwing the screws passed through the screw passage portion along the connecting direction into the screw hole members and tightening them.

In this case, when a screw cannot be inserted along the connecting direction, the screw is inserted from a direction that forms an angle with respect to the connecting direction, as shown in Patent Document 1 and the like, and the members are drawn together at the time of fastening. It is conceivable that the component force is directly generated.
JP 2003-105902 A

  However, if this is the case, a special nut member must be used, or a special nut structure must be built in the member, leading to an increase in man-hours and costs. It is impossible to deal with an aspect in which a component that draws members directly does not occur, for example, an aspect in which a screw is inserted from the side.

  The present invention has been made paying attention to such a problem, and even with a simple structure, the members can be reliably fitted and connected, and the screw from the direction orthogonal to the connecting direction can be connected. The present invention intends to provide a new furniture having a member connection structure that can easily cope with a stop.

  In order to achieve this object, the present invention takes the following measures.

  In other words, the furniture of the present invention is configured by fitting and connecting members, and provided with a nut accommodating portion into which one member can be inserted from the direction crossing the connecting direction. The nut accommodating portion is accommodated in the nut accommodating portion in a freely movable and non-rotating state along the connecting direction, and the screw hole is made to face the first bolt passage portion provided on the bottom side of the nut accommodating portion. The other member is fitted to the outside so as to close, the bolt is inserted from the second bolt passage portion provided in the nut corresponding portion of the other member, and the first bolt passage portion is passed through and screwed into the nut. By combining and tightening, a component force in a direction different from the tightening direction is generated between the nut and the nut housing portion, thereby pulling the members together and connecting them.

If comprised in this way, even if the fitting depth of members changes, bolt tightening by interaction between a nut and a nut accommodating part, maintaining a relative position of a bolt and a nut, while a nut moves freely Because it generates a component force in a direction different from the direction and tightens the members so that they pull each other, it can be used from the direction that crosses the connecting direction using a general hex nut or square nut without the need to build a special nut member. The members can be reliably connected to each other, and a relatively simple structure is sufficient for the nut housing portion.

As a particularly preferable aspect, the nut housing portion can be inserted with a nut from a direction substantially orthogonal to the connection direction, and when the nut is fastened in a direction substantially orthogonal to the connection direction by a bolt, the nut and the nut What makes it generate the component force along a connection direction between accommodating parts is mentioned.

In order to make the structure of the nut housing part particularly simple, a part of the nut housing part has a tapered surface gradually narrowing the nut housing part toward the bottom, and as the nut is attracted by the bolt, It is desirable to apply a component force in a direction in which the fitting between one member and the other member is deepened by the taper action.

In order to be able to perform the bolt fastening without difficulty, it is desirable that the R portion existing at the corner portion on one end face side of the nut faces the tapered surface.

In order to reliably secure the tightening force by the bolt in the nut housing portion, it is effective to provide the nut housing portion with a rotation restricting portion that engages with at least one side of the nut and restricts its rotation. .

As a configuration that substantially secures the loose movement of the nut, it is desirable that the first bolt passage portion has a long hole shape or a groove shape extending along the connecting direction of the members.

In order to effectively generate the component force, it is preferable that the opening end of the second bolt passage portion has a tapered shape and the bolt head portion has a countersunk screw shape corresponding to the opening end.

In order to make the fitting operation easy and reliable, with bolt fastening, at least a pair of outer walls of one member in a cross-section along the connecting direction is engaged with an inner wall facing the other member in a tapered manner. It is desirable to keep it.

In order to make the connected state more reliable, with one member inserted into the other member, the joint end surface set at a predetermined position of one member and the joint end surface set at a predetermined position of the other member It is effective to set so that the joining end faces come into close contact with each other as a gap exists between them and the two members are more deeply engaged with each other as the bolt is tightened.

In order to obtain an accurate strength even if the bolt is tightened from only one side, the outer wall forming a pair of one member in a cross section perpendicular to the connecting direction is tapered to the inner wall facing the other member as the bolt is tightened. It is preferable to make it fit.

In order to facilitate adjustment of the nut housing portion, it is desirable that at least one member is a molded body in which the nut housing portion is integrally formed.

Since the present invention is configured as described above, the present invention is applied to a chair in which one member is a back support rod connecting portion provided so as to protrude from the back, and the other member is a back support rod having a pipe-shaped opening end. Can be extremely useful.

  Since the present invention has the configuration described above, it is possible to securely connect the members even if they are screwed from the direction crossing the connecting direction without adopting a complicated structure that leads to an increase in man-hours and costs. In particular, it is possible to provide a furniture having a novel and useful member connection structure that can easily cope with screwing from a direction orthogonal to the connection direction.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1-5 has shown the chair which is furniture of this embodiment. This chair is attached to the leg blade 11 via a support column 12 so that the base 2 can be rotated about the vertical axis, and the back support rods 3 are attached to both sides of the chair main body 3 so as to be rotatable about the horizontal axis. The seat 4 and the back 5 are associated with the base 2 and the back support rod 3 so as to be capable of being synchronized with each other.

  The base 2 is composed of a support base 21 rotatably attached to the support column 12 and a seat mounting portion 22 disposed on the support base 21. The support base 21 has a support projecting laterally from the base. A base end 3 a of the back support rod 3 is rotatably attached via a shaft 61. The seat mounting portion 22 has a front portion connected to the front end of the support base portion 21 via a slide mechanism including a long hole 21a and a pin 22a, and a rear portion supported on a support shaft 62 constructed between a pair of back support rods 3. It connects so that it can rotate through 22b. Then, with the seat 4 attached to the seat mounting portion 22 and the back 5 attached to the extended end 3b of the back support rod 3, the back support rod 3 is tilted backward about the support shaft 61, whereby the arrow in FIG. As shown, the rear portion of the seat mounting portion 22 is moved rearward and downward by the support shaft 62, and the front portion of the seat mounting portion 22 is moved rearward by a sliding motion in the long hole 21a of the pin 22a. A synchro tilt operation in which the rearward tilting operation of 5 and the rearward downward sinking operation of the seat 4 are interlocked is caused. The base 2 itself does not incorporate a lock mechanism for locking the spine 5.

In such a configuration, as shown in FIGS. 1 and 4 to 6, the present embodiment includes a back support rod connecting portion 54, which is a first member provided on the lower frame portion 52 of the back 5, and the above-described configuration. Further, the extended ends 3b of the pair of back support rods 3 which are the second members distributed to the left and right side portions of the base portion 2 are connected using the member connecting structure according to the present invention.

The back support rod connecting portion 54 includes a substantially prismatic fitting portion 54a integrally provided so as to protrude forward in the vicinity of the width direction edge portion on the front surface of the lower frame portion 52 of the back 5, and the fitting portion. An enlarged portion 54b located on the proximal end side of 54a is provided, a step is provided at the boundary between the fitting portion 54a and the enlarged portion 54b, and the front surface is set as a joining end surface 54c. The inner surface 54a1 and the outer surface 54a2 of the fitting portion 54a have a tapered shape that gradually becomes narrower toward the tip in a plan view as shown in FIGS. 6 and 7A and the like. A nut accommodating portion 154 into which the nut 8 can be inserted from a direction substantially orthogonal to the connecting direction is recessed at a predetermined position on the outer surface 54a2 of the fitting portion 54a, and the nut accommodating portion 154 has a bottom 154a side along the connecting direction. A first bolt passage portion 54d having a long hole shape is provided so as to penetrate to the inner surface 54a1 side. As shown in FIGS. 6 and 7B, the nut accommodating portion 154 has a bottom portion 154a that substantially corresponds to the outer shape of the nut (hexagonal nut) 8 and an open end 154b that allows the nut to move freely along the connecting direction. The opposite two sides 154c are extended, and a tapered surface 154e is formed in the inner side of the two sides 154d so as to gradually approach the shape of the nut 8 from the opening end 154b to the bottom 154a to some extent. The opposing two sides 154c and the remaining two sides 154f are not inclined. Further, the nut accommodating portion 154 accommodates the nut 8 relatively closely in the width direction, and the nut 8 is located in any floating position, out of a total of six sides of the two sides 154c, 154d, and 154f. At least one side or two sides serve as a rotation restricting portion so as to restrict the rotation of the nut.

On the other hand, the back support rod 3 shown in FIGS. 5 and 6 and the like is made of aluminum die cast and has a square pipe shape in which at least the extension end 3b is composed of the upper wall 131, the bottom wall 132, the inner wall 133, and the outer wall 134. The inner end 30 a of the opening 30 forms a partition wall in the cross-sectional direction of the back support 3. The opening end is set as a joining end surface 30c, and the inner surface 133a of the inner wall 133 and the inner surface 134a of the outer wall 134 shown in FIGS. 6 and 7A and the like in the opening 30 are directed from the opening end 30c to the inner end 30a. Thus, the taper is gradually narrowed corresponding to the relationship between the inner surface 54a1 and the outer surface 54a2 of the fitting portion 54a. The inner wall 133 is provided with a second bolt passage portion 135 having a round hole shape in a portion corresponding to the first bolt passage portion 54d and the nut housing portion 154 of the fitting portion 54a in the fitted state. The opening end 135a of the second bolt passage portion 135 is tapered.

Next, a connection procedure will be described. First, as shown in FIG. 6, the nut 8 is put into the nut accommodating portion 154 so that the R portion existing at the corner on one end face side of the general-purpose nut 8 faces the tapered surface 154e when accommodated. 8a is caused to face the first bolt passage 54d provided on the bottom portion 154a side of the nut housing portion 154, and the nut housing portion 54 is closed so that the back support rod connecting portion 54 is back supported as shown in FIG. Insert 桿 3 from the outside. In this state, the fitting portion 54 a is not completely inserted into the opening 30 of the back support rod 3, and is slightly between the joint end surface 54 c of the back support rod connection portion 54 and the joint end surface 30 c of the back support rod 3. The gap d is set to exist.

Then, the bolt 9 having a countersunk screw shape corresponding to the tapered shape of the opening end 135a of the second bolt passage portion 135 is passed through the second bolt as shown by an arrow in FIG. As shown in FIG. 8A, the bolt 9 is inserted through the portion 135, passed through the first bolt passage portion 54d provided in the fitting portion 54a of the back support rod connection portion 54, and screwed into the nut 8. Tighten to. Accordingly, when the nut 8 is drawn from the opening end 154b of the nut housing portion 154 toward the bottom portion 154a as shown in FIG. 7A → FIG. 8A, the nut in the nut housing portion 8 is along the tapered surface 154e. 9 moves to the proximal end side of the fitting portion 54 along the connecting direction as shown in FIGS. 7 (a) → 8 (a), 7 (b) → 8 (b). Since the bolt 9 is positioned at the tapered opening end 135a of the second bolt passage 135, the relative axial center position of the nut 8 with respect to the back support rod 3 is kept constant together with the bolt 9. Be drunk. As a result, as shown by an arrow in FIG. 8, the back support rod connecting portion 54 is divided into a direction substantially perpendicular to the tightening direction from the nut 8 through the taper surface 154e, that is, along the connecting direction using the bolt 9 as a scaffold. With the force F acting, the back support rod connecting portion 54 is pressed in the direction of deepening the fitting with the back support rod 3 as indicated by the arrow G as the nut 8 moves. As a result, when the nut 8 reaches the bottom 154a of the nut accommodating portion 154 at the end of the fastening operation of the bolt 9, the joint end faces 30c and 54c come into close contact with each other, and the back support rod 3 and the back support rod connecting portion 54 Will be completed.

In this chair, as shown in FIGS. 1 and 4, the back locking mechanism normally configured in the base 2 is taken out of the base 2 and the base 2 and the back 5 in the form of a gas spring mechanism 7. Therefore, as shown in FIG. 4 and the like, the lock mechanism attaching portion 55 is integrally formed at the center portion in the width direction of the lower frame portion 52 located at the lower side portion of the back 5.

The lock mechanism mounting portion 55 is provided with a pair of vertical ribs 55a opposed to each other in the spine width direction in a state of being supported by the horizontal ribs 56a by resin integral molding, and a bearing portion through which a shaft (not shown) is inserted. A shaft hole 55c is formed.

Then, one end 7a of the gas spring mechanism 7 is rotatably supported by a support shaft 64 provided at the rear portion of the base 2 as shown in FIGS. 1, 2, 4, 5, etc., and a shaft formed at the other end 7b. The hole 71 is inserted between the left and right vertical ribs 55a constituting the lock mechanism mounting portion 55 so as to match the shaft holes 55c formed in the vertical ribs 55a. The gas spring mechanism 7 is attached between the base 2 and the spine 5 by being inserted.

That is, when the back support rod 3 rotates around the support shaft 61 together with the back 5, the gas spring mechanism 7 having one end 7a attached to the support shaft 64 behind the support shaft 61 has the back 5 to which the other end 7b is attached. The lock mechanism mounting portion 55 is compressed as it gradually approaches the support shaft 64, and is locked again at a required compression position, so that the back seat is held in an appropriate synchronized tilt state. When the locked state is released, the returning force to the posture of FIG. 1 is developed.

As shown in FIGS. 4 and 5, the back support rod 3 has a bearing 31 for inserting the support shaft 61 into the upper wall 131 in the vicinity of the base end 3a, and the upper wall 131 in the vicinity of the extended end 3b. Each of the bearing portions 32 through which the support shaft 62 is inserted is formed by providing a raised portion by molding and mounting a resin bush. A rotation restricting pin 63 (see FIGS. 1 and 5) that restricts the rotation range of the back 5 is inserted into the shaft hole 33 located on the base end 3 a side so as to protrude from the support base 21. Moreover, what is indicated by reference numeral 34 in the figure is an opening for attaching the elbow 6 and is closed by a resin cover or the like when the elbow 6 is not attached.

As described above, the chair of the present embodiment crosses the back support rod connection portion 54 in the connecting direction when the back support rod connection portion 54 and the back support rod 3 provided on the back 5 are fitted and connected. A nut accommodating portion 154 into which the nut 8 can be inserted from the direction is provided, and the nut 8 is accommodated in the nut accommodating portion 154 in a state where the nut 8 can be freely moved along the connecting direction and is prevented from rotating. After facing the first bolt passage portion 54d provided on the bottom portion 154a side, the back support rod 3 is fitted to the outside so as to close the nut housing portion 154, and the nut corresponding portion of the back support rod connection portion 54 The bolt 9 is inserted from the second bolt passage portion 135 provided in the first bolt passage, passed through the first bolt passage portion 54d, and then screwed into the nut 8 to be tightened, whereby the nut 8 and the nut housing portion 154 are interposed. Different from the tightening direction By generating a component force F of the direction, in which so as to connect with attract and back 支桿 connecting portion 54 and the back 支桿 3.

If comprised in this way, even if the fitting depth of the back support rod connection part 54 and the back support rod 3 changes, the nut 8 will move loosely, while maintaining the relative position of the bolt 9 and the nut 8, the nut 8 Since the component force F in the direction different from the bolt tightening direction can be generated by the interaction between the nut support portion 154 and the nut support portion 154, the back support rod connecting portion 54 and the back support rod 3 can be tightened. The members can be reliably connected from the direction intersecting with the connecting direction using a general hexagon nut without the need for making the nut, and the nut housing portion 154 can be handled with a simple structure. .

In particular, the nut housing portion 154 can insert the nut 8 from a direction substantially orthogonal to the connecting direction, and the bolt 9 is fastened in a direction substantially orthogonal to the connecting direction by the bolt 9. The connection between the back support rod connecting portion 54 and the back support rod 3 can be realized under a mode in which the passage portions 135 and 54d are formed and the bolt 9 is tightened. Since the extension end 3b of the back support rod 3 is blocked by the back 5 and the bolt 9 cannot be inserted from the connecting direction, the application of the present invention to this chair can be extremely useful.

Specifically, a part of the nut accommodating portion 154 has a tapered surface 154e that gradually narrows the nut accommodating portion 154 toward the bottom portion 154a, and as the nut 8 is attracted by the bolt 9, the taper action causes the back support. The component force F is applied in the direction in which the fitting between the heel connection portion 54 and the back support rod 3 is deepened, and the configuration for generating the component force F is realized only by providing the tapered surface 154e. Therefore, a very simple structure of the nut housing portion 154 is sufficient.

In this case, the bolt 9 is fastened after the nut 8 is accommodated after the nut 8 is accommodated so that the R portion existing at the corner on the one end face side of the nut 8 faces the tapered surface 154e, and the nut 8 is the tapered surface 154e of the nut accommodation portion 154. On the other hand, since the component force F is generated by sliding through the R portion, the nut 8 and the taper surface 154e can be prevented from being caught, and the nut 8 can be easily slipped. It is possible to smoothly pull members together while suppressing the occurrence of.

Then, at least one side of the two sides 154c, 154d, and 154f constituting the nut housing portion 154 is rotated in relation to at least one side of the nut 8 regardless of the loose position of the nut 8. Therefore, even if the nut accommodating portion 154 allows the nut 8 to move freely, it is possible to prevent the nut 8 from co-rotating when tightening with the bolt 9 and to accurately release the tightening force. And can be securely tightened and connected.

Further, since the first bolt passage portion 54d has a long hole shape extending along the connecting direction of the back support rod connection portion 54 and the back support rod 3, the first bolt is moved along with the loose movement of the nut 8. Even if the relative position of the bolt passage portion 54d and the bolt 9 changes, such behavior can be substantially secured.

Furthermore, since the opening end 135a of the second bolt passage portion 135 is tapered and the head portion 9a of the bolt 9 is shaped like a countersunk screw, the bolt 9 and the nut 8 are connected to the second bolt passage portion. 135, the bolt 9 is used as a scaffold, and the component force F between the nut 8 and the nut receiving portion 154 acts between the back support rod connecting portion 54 and the back support rod 3 effectively. Thus, the members can be securely tightened in a direction to draw them together, and the above-described effects can be effectively achieved.

Further, as the bolts are fastened, the inner surface 54a1 and the outer surface 54a2 of the fitting portion 54, which are a pair of outer walls of the back support rod connecting portion 54, face the back support rod 3 in the cross section in FIG. Since the inner surface 133a of the inner wall 133 and the inner surface 134a of the outer wall 134 are engaged with each other in a tapered manner, the entire back support rod connection portion 54 as one member and the back support rod 3 as the other member are fitted together. The joint operation is easy and the structure can be effective in increasing the strength at the time of fitting.

Further, in a state where the back support rod connecting portion 54 is inserted into the back support rod 3, the joint end surface 54c set at a predetermined position of the back support rod connecting portion 54 and a predetermined position of the back support rod 3 as shown in FIG. There is a gap d between the set joint end face 30c, and the joint end faces 54c and 30c are connected to each other as shown in FIG. Since it is set so as to hit tightly as shown in FIG. 8, the wobbling between the members can be prevented more accurately when the fitting is completed, and the connection strength can be increased.

Furthermore, the back support rod connecting portion 54 is formed of a molded body in which the nut housing portion 154 is integrally formed, and the nut housing portion 154 can be prepared at the time of molding. In combination with the ability to implement, the implementation of the present invention can be facilitated.

Thus, in the present invention, one member is the back support rod connecting portion 54 provided to protrude from the back 5 of the chair, and the other member is the back support rod 3 having the pipe-shaped open end 3b constituting the chair. It can be very useful when applied.

The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, as exaggeratedly shown in FIG. 9, a pair of tapered surfaces 54 z provided on the upper and lower outer walls of the back support rod connection portion 54 in the cross section orthogonal to the connection direction with bolt fastening correspond to the back support rod 3. You may provide further the structure engaged in a taper shape to the taper surface 3z provided in the inner wall. By doing in this way, even if bolt 9 is tightened only from one side, connection strength can be made more reliable.

In addition, the present invention can be effectively applied to, for example, the connection between a horizontal member and a column in a table, the connection between a top plate and a leg, and the like.

In addition to the hexagon nut, a square nut or the like can be effectively employed as the nut.

The side view which shows the chair which is the furniture which concerns on one Embodiment of this invention. The rear view. The rear perspective view. The perspective view which shows the mechanism part of the embodiment. The exploded view of FIG. The perspective view which shows the connection part of the back support rod and back | dorsal back support rod connection part of the embodiment. The cross-sectional view and longitudinal cross-sectional view which show the state before the completion of the connection. The cross-sectional view and longitudinal cross-sectional view which show the state at the time of the completion of the connection. The figure which shows the modification of this invention

Explanation of symbols

3 ... The other member (back support rod)
8 ... Nut 9 ... Bolt 9a ... Bolt head 54 ... One member (back support rod connection part)
54d ... 1st bolt passage part 135 ... 2nd bolt passage part 135a ... Open end 154 ... Nut accommodating part 154e ... Tapered surface F ... Component force

Claims (12)

Furniture configured by fitting and connecting members,
One member is provided with a nut housing portion into which a nut can be inserted from the direction crossing the connecting direction, and the nut is accommodated in the nut housing portion in a state where the nut can be freely moved along the connecting direction and is prevented from rotating. A first bolt provided on the nut-corresponding portion of the other member is fitted to the outside so as to face the first bolt passage provided on the bottom side of the housing and to close the nut housing. The bolt is inserted from the bolt passage part of 2 and passed through the first bolt passage part, screwed into the nut and tightened, thereby generating a component force in a direction different from the tightening direction between the nut and the nut housing part. The furniture is characterized in that the members are drawn and connected together. The nut housing part can be inserted from the direction substantially perpendicular to the connection direction, and when the nut is fastened in a direction substantially perpendicular to the connection direction by a bolt, the nut is connected between the nut and the nut housing part. The furniture according to claim 1, wherein a component force along the direction is generated. Part of the nut housing part forms a tapered surface that gradually narrows the nut housing part toward the bottom, and as the nut is attracted by the bolt, the taper action causes the fitting between one member and the other member The furniture according to claim 1 or 2, wherein a component force is applied in a direction in which the depth becomes deeper. The furniture according to claim 3, wherein an R portion located at a corner portion on one end face side of the nut is disposed so as to face the tapered surface. The furniture according to any one of claims 1 to 4, wherein the nut housing portion is provided with a rotation restricting portion that engages with at least one side of the nut and restricts its rotation. The furniture according to claim 1, wherein the first bolt passage portion has a long hole shape or a groove shape extending along a connecting direction of the members. The furniture according to any one of claims 1 to 6, wherein the opening end of the second bolt passage portion has a tapered shape, and the bolt head portion has a countersunk screw shape corresponding to the opening end. The furniture according to any one of claims 1 to 7, wherein at least a pair of outer walls of one member is engaged with an opposing inner wall of the other member in a tapered shape in a cross section along the connecting direction as the bolt is fastened. With one member inserted into the other member, there is a gap between the joint end surface set at the predetermined position of one member and the joint end surface set at the predetermined position of the other member. The furniture according to any one of claims 1 to 8, wherein the joint end faces are closely abutted as the two members are deeply engaged with each other. The furniture according to claim 8 or 9, wherein at least a pair of outer walls of one member is engaged with an inner wall of the other member in a tapered shape in a cross section perpendicular to the connecting direction as the bolt is fastened. The furniture according to claim 1, wherein at least one member is a molded body integrally formed with a nut housing portion. The furniture according to any one of claims 1 to 11, wherein one member is a back support rod connecting portion provided protruding from the back, and the other member is a back support rod having a pipe-like opening end.

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