Rotary telescopic device

Abstract

To provide a rotary telescopic device that can suppress twisting of a coil spring when a rod is pushed in and rotated, thereby preventing the malfunctioning of the rod.SOLUTION: This rotary telescopic device 10 has a body member 11, a rod 40, a spring housing space 44 provided in the rod, a coil spring 50 that urges the rod 40, a cam mechanism formed between the rod 40 and a tubular part 15 that causes the rod 40 to move axially and concurrently to rotate, and a spacer 80 positioned between one end of the coil spring 50 and a closed end portion 43. A rotating sliding portion is provided between the spacer 80 and the closed end portion 43, locally contacting the spacer 80 and the closed end portion 43, including a portion located at the axial center C of the coil spring 50.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a rotary telescopic device, for example, used in an opening and closing structure of a fuel lid of an automobile, and configured to expand and contract while rotating by a pushing operation.

Background Art

[0002] For example, in a fuel lid of an automobile, a rod for receiving and supporting the lid is arranged in a state where the lid is closed with respect to an opening. This rod often has a structure that expands and contracts by a pushing operation of the lid.

[0003] As a device having such a structure, Patent Document 1 below describes a rotary telescopic device having a main body member having a cylindrical portion, a moving member held axially slidable and rotatable with respect to the cylindrical portion, a spring member for biasing the moving member, a protrusion formed on the outer periphery of the moving member, and a cam groove formed on the inner periphery of the cylindrical portion into which the protrusion fits. The cam groove has a first fitting groove, a second fitting groove, a first guide groove, and a second guide groove, and they are arranged so as to circulate along the inner periphery of the cylindrical portion. Further, the moving member has a spring accommodation space, and a closing end portion is arranged on one end side thereof. Furthermore, the spring member is a coil spring, and in a state where the coil spring is compressed, one end portion in the axial direction thereof presses the closing end portion of the moving member and biases the moving member in a direction protruding from one end of the cylindrical portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the rotary telescopic device of Patent Document 1 described above, when the moving member is pushed in while rotating by the cam groove against the biasing force of the coil spring, the following problems may occur.

[0006] That is, since the other end portion of the coil spring abuts against and is supported by the inner surface of the main body member, its rotation is restricted to a certain extent (see FIG. 7 of Cited Document 1). However, when the moving member is pushed in while rotating, the rotational force of the moving member acts on one end portion of the coil spring, so the coil spring may be twisted in the same direction as the rotational direction of the moving member. Then, when the twisted end portion of the coil spring elastically returns, a rotational force in the direction opposite to the rotational direction when the moving member is pushed in acts on the moving member, so it is required to make the operation of the moving member more stable.

[0007] Therefore, an object of the present invention is to provide a rotary telescopic device capable of suppressing the torsion of a coil spring and stabilizing the operation of a rod when the rod is pushed in and rotated.

Means for Solving the Problems

[0008] To achieve the above object, the rotary telescopic device according to the present invention includes a main body member having a cylindrical portion with a circular inner circumference, a rod having a circular outer circumference and disposed within the cylindrical portion and held rotatably and axially movably with respect to the cylindrical portion, a spring accommodation space provided inside the rod and having a shape in which a closed end portion is disposed on one end side of the rod and the other end side is open, a coil spring disposed within the spring accommodation space and biasing the rod in a direction protruding from one end of the cylindrical portion, a cam mechanism formed between the rod and the cylindrical portion for axially moving the rod while rotating the rod, and a spacer disposed between one end portion of the coil spring and the closed end portion, wherein a rotary sliding portion is provided which locally abuts the spacer and the closed end portion so as to include a portion located on the axis of the coil spring, or locally abuts the spacer and one end portion of the coil spring so as to include a portion located on the axis of the coil spring.

Advantages of the Invention

[0009] According to the present invention, since a rotary sliding portion is provided which locally abuts the spacer and the closed end portion, or locally abuts the spacer and one end portion of the coil spring, the sliding area between the spacer and the closed end portion, or the sliding area between the spacer and one end portion of the coil spring can be made smaller than in the case where there is no rotary sliding portion, and when the rotational force from the rod is transmitted to the coil spring via the spacer, it is possible to make it difficult for the rotational force to act on the one end side of the coil spring. As a result, the torsion of the coil spring can be suppressed, and the operation of the rod can be stabilized.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0011] (An Embodiment of the Rotary Telescopic Device) Hereinafter, with reference to the drawings, an embodiment of the rotary telescopic device according to the present invention will be described.

[0012] This rotary telescopic device is used, for example, in the opening and closing structure of an opening and closing body such as a fuel lid as shown in FIG. 1. As shown in FIG. 1, a fixed member 1 having a substantially cylindrical box shape is fixed to the periphery of the fuel filler opening of the vehicle body 1a. An opening and closing body (fuel lid) 5 is attached to the opening 2 of the fixed member 1 via a hinge portion 3 so as to be openable and closable. Further, a concave portion 3a is provided on the side opposite to the hinge portion 3 in the circumferential direction of the opening 2 of the fixed member 1, and the rotary telescopic device 10 of this embodiment (hereinafter, also simply referred to as "telescopic device 10") is disposed in the concave portion 3a.

[0013] An engaging portion 6 is provided on the inner surface side of the opening and closing body 5. The engaging portion 6 is composed of a pair of side wall portions 7, 7 and a connecting wall 8 connecting one ends of them, and has a portal frame shape. An engaging groove 9 is provided between the pair of side wall portions 7, 7.

[0014] The telescopic device 10 of this embodiment is used in the opening and closing structure of the fuel lid as described above, but may be used, for example, in the opening and closing structure of a glove box of an automobile, furniture or daily necessities having a structure that opens and closes by being pushed in, and the usage mode, installation location, etc. are not particularly limited.

[0015] As shown in FIGS. 2 to 4, the telescopic device 10 of this embodiment includes a first main body portion 20 and a second main body portion 30, and a main body member 11 having a cylindrical portion 15 with a circular inner circumference, an outer circumference of which is circular, and is disposed within the cylindrical portion 15 and rotatably and axially movably held with respect to the cylindrical portion 15. A rod 40, a spring accommodation space 44 provided inside the rod 40, having a shape in which a closing end portion 43 is disposed at one end side of the rod 40 and the other end side is open, a coil spring 50 disposed within the spring accommodation space 44 and biasing the rod 40 in a direction protruding from one end 15a (axial tip) of the cylindrical portion 15, a cam mechanism formed between the rod 40 and the cylindrical portion 15 for axially moving the rod 40 while rotating it, and a spacer 80 disposed between one end of the coil spring 50 and the closing end portion 43. Further, the cam mechanism in this embodiment is composed of a cam protrusion 48 formed on the outer circumference of the rod 40 and a cam groove 70 (see FIG. 5) formed around the cylindrical portion 15 into which the cam protrusion 48 fits to axially move the rod 40 while rotating it.

[0016] In the case of this embodiment, the coil spring 50 is formed by winding a wire of a predetermined diameter at a predetermined pitch and extends for a predetermined length. Seat winding portions 51 and 53 are provided at one axial end portion and the other end portion of the coil spring 50. Further, the end 55 of the seat winding portion 51 on the one axial end side of the coil spring 50 is wound so as to have a smaller diameter than the other seat winding portions 51 other than the end 55. Note that the axial center of the coil spring 50 (a line segment passing through the center in the radial direction of the coil spring 50 and extending along the axial direction) is referred to as "axial center C1" (see FIG. 4).

[0017] And in the telescopic device 10 of this embodiment, a rotary sliding portion is provided between the spacer 80 and the closing end portion 43 to locally contact the spacer 80 and the closing end portion 43 so as to include a portion located on the axial center C1 of the coil spring 50.

[0018] Hereinafter, each component will be described. First, the structure of the main body member 11 will be described in detail.

[0019] This main body member 11 is composed of a first main body portion 20 and a second main body portion 30 which are assembled to each other in such a manner that a cylindrical portion 15 having a circular inner circumference is axially divided. As shown in FIG. 5, the cylindrical portion 15 is composed of a first cylindrical portion 23 and a second cylindrical portion 33 which are formed by axially dividing the cylindrical portion 15. The first cylindrical portion 23 is provided on the side of the first main body portion 20, and the second cylindrical portion 33 is provided on the side of the second main body portion 30. In FIGS. 5 and 6, for the sake of easy explanation of the structure, only the cylindrical portions 23 and 33 of the respective main body portions 20 and 30 are shown for convenience.

[0020] As shown in FIG. 2, the first main body portion 20 has a base portion 21 which is formed in a substantially long box shape extending long in one direction, and a cylindrical wall 22 which is formed in a substantially cylindrical shape is provided at one end side in the longitudinal direction of the base portion 21. This cylindrical wall 22 has a configuration in which a cylindrical portion 22a having a large diameter and a cylindrical portion 22b having a smaller diameter than that are connected in the axial direction. The first cylindrical portion 23 is integrally formed inside the cylindrical wall 22. This cylindrical wall 22 also serves as a member constituting the cylindrical portion 15. Further, a cap 17 made of rubber, elastic elastomer, or the like is attached to the outer periphery of one end (tip) side of the cylindrical portion 22a of the cylindrical wall 22 and the outer periphery of one end side of the cylindrical portion 22b.

[0021] As shown in FIG. 4, the second cylindrical portion 33 of the second main body portion 30 is inserted into the cylindrical wall 22. Further, a cap 19 made of rubber or the like is attached to the other end side in the longitudinal direction of the base portion 21 with respect to the cylindrical wall 22 and on one side in the width direction. Further, a locking recess 25 is formed on one end side in the longitudinal direction and on one side in the width direction of the outer peripheral edge portion of the base portion 21 on the contact surface side with the second main body portion 30.

[0022] On the other hand, as shown in FIG. 2, the second main body portion 30 has a base portion 31 which is formed in a substantially long plate shape extending long in one direction corresponding to the first main body portion 20. At one end side in the longitudinal direction of the base portion 31, a bottomed cylindrical second cylindrical portion 33 which forms the cylindrical portion 15 together with the first cylindrical portion 23 is provided.

[0023] Further, the outer diameter of the second cylindrical portion 33 is the same as the outer diameter of the first cylindrical portion 23 and is dimensioned to be insertable into the cylindrical wall 22 of the first main body portion 20. Therefore, as shown in FIG. 3, in a state where the first main body portion 20 and the second main body portion 30 are assembled to form the main body member 11, the second cylindrical portion 33 is inserted into the cylindrical wall 22, and as shown in FIGS. 4 and 5, cam grooves 70 are formed on end faces of the first cylindrical portion 23 and the second cylindrical portion 33 that face each other in the axial direction. The detailed structure of the cam grooves 70 will be described later.

[0024] Also, as shown in FIG. 2, a locking claw 35 projects from the outer peripheral edge portion of the base portion 31 on one end side in the longitudinal direction and on one side in the width direction. This locking claw 35 is locked by the locking recess 25 of the first main body portion 20, and the first main body portion 20 and the second main body portion 30 are assembled by a fixing pin 36 (see FIG. 4) so that the main body member 11 is formed (see FIG. 3).

[0025] Furthermore, as shown in FIGS. 2 and 4, a columnar spring support column 37 projects from the center of the inner surface of the bottom portion 33a of the second cylindrical portion 33. This spring support column 37 is inserted into the coil spring 50 to make the coil spring 50 difficult to tilt. Also, the coil spring 50 supported by the spring support column 37 is such that the seat winding portion 53 on the other end side in the axial direction thereof abuts against the bottom portion 33a of the second cylindrical portion 33.

[0026] Next, the rod 40 will be described in detail.

[0027] As shown in FIG. 4, the rod 40 of this embodiment has a cylindrical wall 41 that is substantially cylindrical and extends with a predetermined length. A closed end portion 43 is disposed on one end side in the axial direction of the cylindrical wall 41, and the other end side in the axial direction is open. A spring accommodation space 44 capable of accommodating the coil spring 50 is provided inside the rod 40. That is, the closed end portion 43 is disposed on one end side in the axial direction of the rod 40 of the spring accommodation space 44, and the other end side in the axial direction is open. Note that the axis of the rod 40 is referred to as "axis C2". In the case of this embodiment, the axis C2 is made to coincide with the axis C1 of the coil spring 50 (see FIG. 4).

[0028] Further, the closing end portion 43 in this embodiment is in the shape of a disc corresponding to the cylindrical wall 41 having a cylindrical shape, and the inner surface of the closing end portion 43, that is, the surface of the closing end portion 43 facing the spring accommodation space 44 side forms a closing end surface 43a. Also, a spacer 80 is arranged between the closing end portion 43 and the seat winding portion 51 on the axial one end side of the coil spring 50 (see FIG. 4).

[0029] Furthermore, a columnar portion 46 having a diameter smaller than that of the cylindrical wall 41 protrudes from the center of the outer surface of the closing end portion 43 (the surface on the side opposite to the closing end surface 43a), and a belt-shaped engaging piece 47 having both longitudinal ends in an arc shape is continuously provided at the tip thereof. Further, a tapered surface 41a is formed on the axially proximal end side of the cylindrical wall 41 (see FIG. 4).

[0030] Then, as shown in FIGS. 7 and 8, the engaging piece 47 of the rod 40 rotates and the angle changes as the rod 40 rotates, and engages with and disengages from the engaging portion 6 of the opening / closing body 5. In the case of this embodiment, when the opening / closing body 5 opens from the opening 2 of the fixing member 1, the longitudinal direction of the engaging piece 47 is arranged so as to be in the direction along the groove direction of the engaging groove 9 of the engaging portion 6 provided on the opening / closing body 5 (see FIG. 7). On the other hand, when the opening / closing body 5 is closed with respect to the opening 2 of the fixing member 1, the angle of the longitudinal direction of the engaging piece 47 changes so as to be orthogonal to the groove direction of the engaging groove 9 (see FIG. 8).

[0031] Furthermore, on the outer periphery of the cylindrical wall 41, at a location near the proximal end in the axial direction, a pair of cam protrusions 48, 48 protrude in the outer diameter direction. In the case of this embodiment, it has a protrusion forming member (not shown) that is separate from the rod 40 and is formed by appropriately bending a metal wire such as stainless steel or spring steel. A pair of cam protrusions 48, 48 are formed by bending at both ends thereof (see Fig. 4). By mounting the above-mentioned protrusion forming member on the outer periphery of the rod 40, the pair of cam protrusions 48, 48 protrude from the outer periphery of the rod (see Fig. 4). The outer periphery of each cam protrusion 48 is circular. And these cam protrusions 48, 48 are fitted into the cam groove 70 formed in the cylindrical portion 15, and the rod 40 is rotated and axially moved according to the pushing operation of the rod 40. Note that the cam protrusion 48 may be integrally formed with the rod 40.

[0032] Also, on the outer periphery of the cylindrical wall 41 on the proximal end side in the axial direction with respect to the pair of cam protrusions 48, 48, at a position orthogonal to the protruding direction of the pair of cam protrusions 48, 48, square hole-shaped lock holes 49, 49 are formed. A lock protrusion 67 of a lock retainer 65 (see Fig. 1), which will be described later, is inserted into and removed from this lock hole 49 to lock the rod 40 in the pushed state or release the locked state.

[0033] And on the closing end portion 43, a closing end portion side protrusion 45 protruding toward the spacer 80 side is provided. More specifically, on the closing end face 43а side of the closing end portion 43, a closing end portion side protrusion 45 having a curved outer surface protrudes from a radially central portion including a portion located on the axis C1 of the coil spring 50 (see Fig. 4). The outer periphery of the bottom portion of the closing end portion side protrusion 45 located on the closing end face 43а side is circular, and from this bottom portion, it has a curved surface protrusion shape in which the protruding amount gradually increases while drawing a curved surface in a direction away from the closing end face 43а. Also, the portion of the closing end portion side protrusion 45 that aligns with the axis C2 of the rod 40 is the top portion 45а that protrudes most from the closing end face 43а, and the outer surface of this top portion 45а is a rounded arc-shaped curved surface. Note that the closing end portion side protrusion 45 includes a portion located on the axis C1 of the coil spring 50.

[0034] Regarding the above-mentioned closing end portion 43, the spacer 80 will be described.

[0035] The spacer 80 in this embodiment has a constant thickness with surfaces on both sides in the thickness direction being parallel to each other, and has a substantially disc shape with a circular outer periphery. Further, the outer diameter of the spacer 80 is formed to have a dimension that conforms to the inner diameter of the cylindrical wall 41 of the rod 40 (formed with an outer diameter slightly smaller than the inner diameter of the cylindrical wall 41), and is rotatable within the spring accommodation space 44.

[0036] Also, in the spacer 80, a radially central portion including a portion located on the axis C of the coil spring 50 on one surface in the thickness direction, that is, the surface facing the closing end portion 43, forms a protrusion contact surface 81. As shown in FIG. 4, the top 45a of the closing end side protrusion 45 locally (partially) contacts the protrusion contact surface 81. This protrusion contact surface 81 is a portion that receives the pressing force due to the pushing-in of the rod 40 and the rotational force due to the rotation of the rod 40 via the closing end side protrusion 45 when pushing in the rod 40 while rotating it against the biasing force of the coil spring 50. That is, in this embodiment, the protrusion contact surface 81 of the spacer 80 and the closing end side protrusion 45 provided at the closing end portion 43 of the rod 40 form the "rotational sliding portion" in the present invention. Note that an R-shaped portion 81a is formed at the outer peripheral edge portion of the surface on the closing end portion 43 side of the spacer 80, making it difficult to interfere with the inner periphery of the spring accommodation space 44.

[0037] Furthermore, as shown in FIG. 4, the other surface of the spacer 80 in the thickness direction, that is, the surface opposite to the protrusion contact surface 81, forms a spring contact surface 82. The end 55 of the seat winding portion 51 of the coil spring 50 contacts the spring contact surface 82. Also, the end 55 of the seat winding portion 51 contacts at a radially outer portion of the spring contact surface 82 rather than the protrusion contact surface 81 of the spacer 80 (see FIG. 4).

[0038] Further, as shown in FIG. 4, the coil spring 50 has a seat winding portion 53 on the other end side in the axial direction abutting against the bottom portion 33a of the second cylindrical portion 33, and the end 55 of the seat winding portion 51 on the one end side in the axial direction abutting against the spring abutting surface 82 of the spacer 80, and is held in the spring accommodation space 44 of the rod 40 and the inside of the cylindrical portion 15 in a compressed state. Therefore, the elastic biasing force of the coil spring 50 always acts on the spring abutting surface 82 of the spacer 80, and the spacer 80 is pressed toward the closing end portion 43 side.

[0039] Then, as shown in FIG. 4, with the spacer 80 disposed between one end of the coil spring 50 and the closing end portion 43, when the rod 40 is pushed in while rotating against the biasing force of the coil spring 50, the rod 40 rotates through a rotary sliding portion formed by the protrusion abutting surface 81 of the spacer 80 and the protrusion 45 on the closing end portion side. That is, the protrusion 45 on the closing end portion side that locally abuts against the protrusion abutting surface 81 of the spacer 80 causes the rod 40 to rotate through the rotary sliding portion while slidingly contacting the protrusion abutting surface 81. As a result, the pushing force and the rotational force from the rod 40 are transmitted to one end of the coil spring 50 via the spacer 80.

[0040] Note that the shape and structure of the rotary sliding portion are not limited to the above-described aspect, and the aspects shown in FIGS. 9 to 11 can also be adopted. This will be described later.

[0041] Also, as shown in FIG. 4, a motor 60 equipped with a worm gear 61 is disposed inside the main body member 11. Further, a lock retainer 65 is disposed at a position adjacent to this motor 60. As shown in FIG. 2, this lock retainer 65 has a main body 66 having a pair of guide pieces 66a, 66a, a lock protrusion 67 protruding from one side surface of the main body 66, and an operation knob 68 protruding in a substantially L shape from one end surface of the main body 66. Also, a meshing portion 66b that meshes with the worm gear 61 is formed inside the main body 66.

[0042] Then, when power is supplied to the motor 60 from a power supply means (not shown) via a plurality of bus bars 63 or the like and the worm gear 61 rotates, the lock retainer 65 slides in a direction approaching and separating from the rod 40, and the lock projection 67 engages with and disengages from the lock hole 49 of the rod 40. When the lock projection 67 enters and engages within the lock hole 49 of the rod 40, the rotation and axial movement of the rod 40 are restricted, and when it comes out of the lock hole 49, the rotation and axial movement of the rod 40 are permitted.

[0043] Next, the structure of the cam groove 70 into which the cam projection 48 fits will be described in detail.

[0044] As shown in FIGS. 5 and 6, this cam groove 70 has a protruding holding portion 71 into which the cam projection 48 fits and holds the rod 40 in a state where it protrudes a predetermined length from one axial end 15a of the cylindrical portion 15, a retracting holding portion 73 into which the cam projection 48 fits and holds the rod 40 in a state where it is retracted a predetermined length into the cylindrical portion 15 from one end 15a of the cylindrical portion 15, a retracting guide portion 75 that guides the cam projection 48 to the retracting holding portion 73 when the rod 40 is pushed in with the cam projection 48 fitted in the protruding holding portion 71, and a protruding guide portion 77 that guides the cam projection 48 to the protruding holding portion 71 when the rod 40 is pushed in with the cam projection 48 fitted in the retracting holding portion 73.

[0045] In the following description, one axial end 15a of the cylindrical portion 15 is simply referred to as "one end" or "axial one end", and the other axial end (the end opposite to the one end 15a) of the cylindrical portion 15 is simply referred to as "the other end" or "axial other end". Also, the end on one circumferential direction side (refer to the arrow R in FIG. 6) of the cylindrical portion 15 is simply referred to as "circumferential one end", and the end on the other circumferential direction side of the cylindrical portion 15 is simply referred to as "circumferential other end".

[0046] FIG. 6 shows a developed view of the cam groove 70. As shown in the figure, the retracting guide portion 75 and the protruding guide portion 77 are inclined with respect to the axis C of the cylindrical portion 15 and extend in one circumferential direction (refer to the arrow R).

[0047] Also, as shown in FIG. 6, the cam groove 70 in this embodiment is arranged to circulate along the circumferential direction of the cylindrical portion 15 in the order of the protruding holding portion 71, the retracting guide portion 75, the retracting holding portion 73, the protruding guide portion 77, the next protruding holding portion 71, the retracting guide portion 75, the retracting holding portion 73, the protruding guide portion 77, and so on. That is, the cam groove 70 of this embodiment is continuously formed over the entire circumference in the circumferential direction of the cylindrical portion 15.

[0048] Note that as described above, the rod 40 is biased in the direction of protruding from one end 15a of the cylindrical portion 15 by the biasing force of the coil spring 50. At this time, since the pair of cam protrusions 48, 48 provided on the rod 40 are fitted into the protruding holding portions 71, 71 of the cam groove 70, the rod 40 is prevented from coming out of one end 15a of the cylindrical portion 15 so as not to come out.

[0049] The protruding holding portion 71 and the retracting holding portion 73 form a concave groove shape formed on the end face of the first cylindrical portion 23 of the first main body portion 20 (the end face facing the second cylindrical portion 33). Further, the protruding holding portion 71 is disposed on the one end 15a side of the cylindrical portion 15 (the protruding direction side of the rod 40), and the retracting holding portion 73 is disposed on the other end side in the axial direction of the cylindrical portion 15, being circumferentially displaced with respect to the protruding holding portion 71.

[0050] Also, the retracting guide portion 75 has its base end portion 75а connected to the protruding holding portion 71, and extends while inclining toward the other end side in the axial direction of the cylindrical portion 15 and in one circumferential direction. Further, the tip portion 75b in the extending direction inclines toward the one end side in the axial direction of the cylindrical portion 15 and in one circumferential direction and is connected to the retracting holding portion 73. Furthermore, the protruding guide portion 77 has its base end portion 77а connected to the retracting holding portion 73, and extends while inclining toward the one end 15a side of the cylindrical portion 15 and in one circumferential direction. The tip portion 77b in the extending direction is connected to the protruding holding portion 71.

[0051] With the cam projection 48 fitted into the protruding holding portion 71, when the rod 40 is pushed in against the biasing force of the coil spring 50, the cam projection 48 is guided by the drawing guide portion 75, and the rod 40 is gradually drawn in from one end 15a of the cylindrical portion 15 while rotating. Further, when the rod 40 is pushed in, the cam projection 48 is guided to the drawing holding portion 73 via the inclined tip portion 75b of the drawing guide portion 75, fits into the drawing holding portion 73, and the rod 40 is held in a state of being drawn into the cylindrical portion 15 by a predetermined length from one end 15a of the cylindrical portion 15. In this state, when the rod 40 is further pushed in, the cam projection 48 comes out of the drawing holding portion 73, is guided by the protruding guide portion 77, and the rod 40 is gradually pushed out from one end 15a of the cylindrical portion 15 while rotating. When the cam projection 48 fits into the protruding holding portion 71, the rod 40 is held in a state of protruding from one end 15a of the cylindrical portion 15 by a predetermined length (see FIG. 5).

[0052] Note that the cam mechanism in this embodiment includes a cam projection 48 provided on the rod 40 side and a cam groove 70 provided on the cylindrical portion 15 side. However, as the cam mechanism, a structure including a cam groove provided on the rod side and a cam projection provided on the cylindrical portion side may be used, as long as it is possible to axially move the rod while rotating it.

[0053] (Modification example of the rotary sliding portion) FIGS. 9 to 11 show modification examples of the rotary sliding portion. Details will be described below. FIG. 9A shows a first modification example, FIG. 9B shows a second modification example, and FIG. 9C shows a third modification example. These modification examples are common in that the spacer is in a cap shape.

[0054] (First modification example) In the first modification example shown in FIG. 9A, the spacer 80A has a cap shape, which consists of a disc-shaped base portion 83 and a peripheral wall 84 extending from the peripheral edge of the base portion 83 in a cylindrical shape in a direction away from the closing end portion 43. Further, as shown in FIG. 9A, the peripheral wall 84 is a portion surrounding the outer periphery of the seat winding portion 51 on the axial one end side of the coil spring 50. Further, a spacer-side protrusion 85 having a curved outer periphery protrudes from a radially central portion of the surface of the base portion 83 facing the closing end portion 43 and including a portion located on the axial center C1 of the coil spring 50. Note that the spacer-side protrusion 85 has the same shape as the closing-end-side protrusion 45 in the embodiment shown in FIG. 4.

[0055] And the top portion 85a of this spacer-side protrusion 85 is locally in contact with a radially central portion of the closing end face 43a of the closing end portion 43 and including a portion located on the axial center C1 of the coil spring 50. That is, in this first modification example, the spacer-side protrusion 85 and the closing end face 43a form a "rotary sliding portion" in the present invention. Note that the terminal end 55 of the seat winding portion 51 of the coil spring 50 abuts against the surface of the base portion 83 of the spacer 80A on the side opposite to the spacer-side protrusion 85.

[0056] (Second Modification Example) The spacer 80B in the second modification example shown in FIG. 9B is basically the same as the first modification example except that the shape of the spacer-side protrusion 86 is different from that of the first modification example. That is, the base portion 83 in the second modification example has a shape that gradually protrudes from its outer peripheral edge portion toward the closing end portion 43 so as to form a substantially conical shape, and this protruding portion serves as the spacer-side protrusion 86. The top portion 86a, where the portion of the spacer-side protrusion 86 located on the axial center C1 of the coil spring 50 protrudes most, has a pointed shape. Note that the peripheral wall 84 in the second modification example extends longer than the peripheral wall 84 in the first modification example.

[0057] Then, the top 86a of the spacer-side protrusion 86 locally contacts the radially central portion of the closing end surface 43a of the closing end portion 43, which portion is located on the axis C1 of the coil spring 50. That is, in this second modification, the spacer-side protrusion 86 and the closing end surface 43a form the "rotary sliding portion" in the present invention. Note that since the pointed top 86a of the spacer-side protrusion 86 locally contacts the closing end surface 43a, the contact area with respect to the closing end surface 43a is smaller than in the case of the first modification shown in FIG. 9A (in the case of the first modification, since the top 85a of the spacer-side protrusion 85 has a curved surface shape, the contact area with respect to the closing end surface 43a is larger than in the second modification).

[0058] (Third Modification) The spacer 80C in the third modification shown in FIG. 9C is basically the same as the second modification except that the shape of the spacer-side protrusion 87 is different from that of the second modification. That is, the base portion 83 in the third modification has a substantially spherical shape that gradually protrudes while drawing a curved surface from its outer peripheral edge portion toward the closing end portion 43, and this protruding portion forms the spacer-side protrusion 87. The portion of this spacer-side protrusion 87 located on the axis C1 of the coil spring 50 is the most protruding top 87a, and this top 87a has a rounded arc-shaped curved surface.

[0059] Then, the top 87a of the spacer-side protrusion 87 locally contacts the radially central portion of the closing end surface 43a of the closing end portion 43, which portion is located on the axis C of the coil spring 50. That is, in this third modification, the spacer-side protrusion 87 and the closing end surface 43a form the "rotary sliding portion" in the present invention.

[0060] A fourth modification is shown in FIG. 10A, a fifth modification is shown in FIG. 10B, and a sixth modification is shown in FIG. 10C. These modifications are common in that a support shaft 88 inserted into the inner circumference of one end portion of the coil spring 50 is provided on the spacer.

[0061] (Fourth Modification) In the fourth modification example shown in FIG. 10A, the spacer 80D has a base portion 83 and a spacer-side protrusion 86 having a substantially conical shape, similar to the spacer 80B of the second modification example. On the surface of the base portion 83 opposite to the spacer-side protrusion 86, a support shaft 88 having a columnar shape extends by a predetermined length from the central portion in the radial direction thereof. This support shaft 88 is inserted into the terminal 55 of the end winding portion 51 on the axial one end side of the coil spring 50, and the terminal 55 is adapted to contact the peripheral edge portion on the proximal end side of the support shaft 88 of the base portion 83. In this fourth modification example, similar to the spacer 80B of the second modification example, the spacer-side protrusion 86 and the closing end face 43a form the "rotary sliding portion" in the present invention.

[0062] (Fifth Modification Example) In the fifth modification example shown in FIG. 10B, the spacer 80E has a base portion 83 and a spacer-side protrusion 87 having a substantially spherical shape, similar to the spacer 80C of the third modification example, and a support shaft 88 similar to the spacer 80D of the fourth modification example. In this fifth modification example, similar to the spacer 80C of the third modification example, the spacer-side protrusion 87 and the central portion in the radial direction of the closing end face 43a form the "rotary sliding portion" in the present invention.

[0063] (Sixth Modification Example) In the sixth modification example shown in FIG. 10C, the spacer 80F has a base portion 83 and a spacer-side protrusion 85 having a curved surface protrusion shape protruding from the central portion in the radial direction thereof, similar to the spacer 80A of the first modification example, and a support shaft 88 similar to the spacers 80D and 80E of the fourth and fifth modification examples. In this sixth modification example, similar to the spacer 80A of the first modification example, the spacer-side protrusion 85 and the closing end face 83a form the "rotary sliding portion" in the present invention.

[0064] (Seventh Modification Example) FIG. 11 shows a seventh modification example of the rotary sliding portion.

[0065] The spacer 80 is similar to the embodiment shown in FIG. 4, and has a substantially disc shape with surfaces on both sides in the thickness direction being parallel to each other. The closing end surface 43a of the closing end portion 43 is configured such that the protruding portion 45 on the closing end portion side does not protrude. Further, in the coil spring 50, the end 55 of the seat winding portion 51 on one end side in the axial direction protrudes toward the spacer 80 side. Note that the end 55 of the coil spring 50 protrudes from a position including the axis C1 of the coil spring 50. Further, the end 55 of the coil spring 50 has a pointed portion 55a, and this pointed portion 55a locally contacts the end contact surface 82a at the radially central portion of the spring contact surface 82 of the spacer 80 that includes the portion located on the axis C1 of the coil spring 50. Note that the surface of the spacer 80 opposite to the spring contact surface 82 contacts the closing end surface 43a of the closing end portion 43.

[0066] Thus, in this seventh modification, a rotational sliding portion is provided between the spacer 80 and one end portion of the coil spring 50 so as to locally contact the spacer 80 and one end portion of the coil spring 50 including a portion including the axis C1 of the coil spring 50. That is, in this seventh modification, the end contact surface 82a of the spacer 80 and the end 55 of the coil spring 50 form the "rotational sliding portion" in the present invention.

[0067] Then, as shown in FIG. 11, when the rod 40 is pushed in while rotating against the biasing force of the coil spring 50 in a state where the spacer 80 is disposed between one end portion of the coil spring 50 and the closing end portion 43, the rod 40 rotates via the rotational sliding portion formed by the end contact surface 82a of the spacer 80 and the end 55 of the coil spring 50. That is, the rod 40 rotates via the rotational sliding portion while the end 55 of the coil spring 50 that locally contacts the end contact surface 82a of the spacer 80 slides in contact. As a result, the pushing force and the rotational force from the rod 40 are transmitted to one end portion of the coil spring 50 via the spacer 80.

[0068] The shape and structure of the spacer described above are not limited to the embodiments shown in FIGS. 4 and 9 to 11. For example, the spacer-side protrusion provided on the spacer may be shaped such that the top is rounded while protruding in a substantially conical shape, or may be a protrusion with a flat top surface, or may be a cylindrical or conical pin-shaped protrusion. Also, the closing-end-side protrusion provided at the closing end may be a substantially triangular pyramid-shaped protrusion or a protrusion protruding in a substantially spherical shape. Any shape and structure may be used as long as it includes the portion located on the axis of the coil spring and has a contact area smaller than the contact area when one end of the coil spring directly contacts the closing end surface of the rod.

[0069] Also, as the material of the spacer, for example, synthetic resin materials such as polyacetal (POM), polyamide (PA), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), and polypropylene (PP), iron-based metals, and metal materials such as stainless steel, titanium, and aluminum can be used. From the viewpoint of reducing sliding resistance and frictional resistance, it is preferable that the spacer is formed of a material different from that of the rod. Also, as the spacer in the seventh modification, in order to suppress the biting of the end of the coil spring while enabling sliding contact, it is preferably a metal material. Note that a lubricant such as grease may be applied between the rotary sliding parts to reduce the sliding resistance and frictional resistance.

[0070] Furthermore, the shapes and structures of the members other than the spacer that constitute the rotary telescopic device, that is, the main body member, the first main body, the second main body, the rod, the motor, the worm gear, the lock retainer, etc. are also not limited to the above embodiments. Also, as the cam groove, any shape and structure may be used as long as it is provided so as to go around in the circumferential direction of the cylindrical portion.

[0071] (Function and Effect) Next, the function and effect of the telescopic device 10 having the above structure will be described.

[0072] As shown in Fig. 5, when the cam projection 48 of the rod 40 is fitted into the protruding holding portion 71 of the cam groove 70, the rod 40 protrudes from one end 15a of the cylindrical portion 15 by a predetermined length. In this state, as shown in Fig. 7, the engaging piece 47 of the rod 40 passes through the engaging groove 9 of the engaging portion 6 and abuts against the inner surface side of the opening / closing body 5, and the opening / closing body 5 can be opened and closed with respect to the peripheral edge of the opening of the fixing member 1.

[0073] When the opening / closing body 5 is closed from the above state, the engaging piece 47 is pressed, and the rod 40 is pushed into the inner side of the cylindrical portion 15 against the biasing force of the coil spring 50. The cam projection 48 that has come out of the protruding holding portion 71 is guided by the pulling guide portion 75, and the rod 40 is pulled into the cylindrical portion 15 while rotating. Further, when the rod 40 is pushed in, the cam projection 48 is guided to the pulling holding portion 73 through the tip portion 75b of the pulling guide portion 75, and is fitted into the pulling holding portion 73, and the rod 40 is held in a state of being pulled into the cylindrical portion 15 by a predetermined length from one end 15a of the cylindrical portion 15. At the same time, as shown in Fig. 8, since the longitudinal direction of the engaging piece 47 of the rod 40 is orthogonal to the groove direction of the engaging groove 9 of the engaging portion 6 of the opening / closing body 5, the opening / closing body 5 can be locked in a closed state with respect to the peripheral edge of the opening of the fixing member 1.

[0074] In the above state, when the worm gear 61 is rotated in a predetermined direction by the motor 60 and the locking projection 67 of the lock retainer 65 is engaged with the locking hole 49 of the rod 40, the rod 40 cannot be pushed in further. As a result, the cam projection 48 cannot be removed from the pulling holding portion 73 of the cam groove 70, and the opening / closing body 5 can be locked in a closed state. On the other hand, when the worm gear 61 is rotated in the opposite direction to the above and the locking projection 67 of the lock retainer 65 is removed from the locking hole 49 of the rod 40, the state where the rod 40 cannot be pushed in is released, and the locked state of the opening / closing body 5 is released.

[0075] When the rod 40 is pushed in against the biasing force of the coil spring 50 from the unlocked state of the opening / closing body 5 as described above, after the cam protrusion 48 comes out of the retracting and holding portion 73, the rod 40 is pressed again toward the one end 15a side of the cylindrical portion 15 by the biasing force of the coil spring 50. The cam protrusion 48 is guided by the protruding guide portion 77, and the rod 40 protrudes from the one end 15a of the cylindrical portion 15 while rotating. Then, when the cam protrusion 48 fits into the protruding holding portion 71, the rod 40 is held in a state of protruding from the one end 15a of the cylindrical portion 15 (see FIG. 5). Further, in this state, as shown in FIG. 7, since the engaging piece 47 is in a direction along the groove direction of the engaging groove 9 of the engaging portion 6 of the opening / closing body 5, the lock in the closed state of the opening / closing body 5 is released. At this time, the opening / closing body 5 is pushed by the rod 40 and lifted by a predetermined height from the opening of the fixing member 1 (lifter operation), so that the opening / closing body 5 can be manually opened.

[0076] And in this telescopic device 10, as shown in FIG. 4, a spacer 80 is disposed between one end portion of the coil spring 50 and the closing end portion 43, and a rotating sliding portion (here, the protrusion contact surface 81 of the spacer 80 and the closing end portion side protrusion 45 provided on the closing end portion 43) is provided so as to locally contact the spacer 80 and the closing end portion 43 so as to include a portion located on the axis C of the coil spring 50. Therefore, the following operational effects are achieved.

[0077] That is, when the rod 40 rotates while being pushed in, the pushing force and the rotational force do not directly act on the coil spring 50, but act via the spacer 80. By providing the rotating sliding portion that locally contacts the spacer 80 and the closing end portion 43, the sliding area between the spacer 80 and the closing end portion 43 can be made smaller than in the case where there is no rotating sliding portion. Therefore, it is possible to make it difficult for the pushing force and the rotational force from the rod 40 to act on one end portion (the seat winding portion 51) in the axial direction of the coil spring 50.

[0078] That is, the spacer 80 is interposed between one end of the coil spring 50 and the closing end portion 43, and due to the decrease in the sliding area caused by providing the rotary sliding portion, the decrease in the sliding torque causes the spacer 80 to be less likely to rotate together and more likely to rotate freely following the rotational movement of the rod 40. As a result, the pushing force and rotational force from the rod 40 act less easily on the coil spring 50. Consequently, the torsion of the coil spring 50 can be suppressed, so that malfunction of the rod 40 (such as a malfunction where the rod 40 cannot be maintained in a state of protruding from the cylindrical portion 15 or being retracted, which is caused by the cam protrusion 48 not fitting into the protruding holding portion 71 or the retracting holding portion 73 of the cam groove 70) can be suppressed, and the pushing and pulling operation and rotational operation of the rod 40 can be stabilized.

[0079] The above-described effects can be similarly obtained in the first modification shown in FIG. 9A, the second modification shown in FIG. 9B, the third modification shown in FIG. 9C, the fourth modification shown in FIG. 10A, the fifth modification shown in FIG. 10B, and the sixth modification shown in FIG. 10C. Further, in the seventh modification shown in FIG. 11, by providing a rotary sliding portion for locally contacting the spacer 80 and one end of the coil spring 50, the sliding area between the spacer 80 and one end of the coil spring 50 can be made smaller than in the case where there is no rotary sliding portion. Therefore, the pushing force and rotational force from the rod 40 can be made less likely to act on one axial end of the coil spring 50, and the same effects as described above can be obtained.

[0080] The above-described effects will be described with reference to FIG. 12. FIG. 12 shows a graph indicating the relationship between the rotation angle of the rod and the spring load of the coil spring or the sliding torque in the rotary sliding portion for the example and the comparative example. The example here is the embodiment shown in FIG. 4, and the comparative example is the aspect shown in FIG. 7 described in International Publication WO2018 / 038034A1, which is an application filed by the applicant of the present application, and does not have a spacer, and the spring member (hereinafter also referred to as "coil spring") directly contacts the closing end portion of the moving member (hereinafter also referred to as "rod").

[0081] In addition, the solid line in FIG. 12 shows the variation between the rotation angle of the rod and the spring load in the embodiment, the dashed line shows the variation between the rotation angle of the rod and the sliding torque in the embodiment, the two-dot chain line shows the variation between the rotation angle of the rod and the spring load in the comparative example, and the one-dot chain line shows the variation between the rotation angle of the rod and the sliding torque in the comparative example. Note that the sliding torque in the comparative example means the sliding torque between one end of the spring member and the closing end portion.

[0082] In FIG. 12, the portion denoted by reference numeral "P1" shows a state where the cam protrusion 48 is fitted into the protrusion holding portion 71 (see P1 in FIG. 6; in the comparative example, the state where the cam protrusion is fitted into the first fitting groove). In this state, the spring load and the sliding torque of both the embodiment and the comparative example are the lowest.

[0083] When the rod 40 is pushed from the state of P1, the coil spring 50 is compressed, and while being guided by the retraction guide portion 75, the rod 40 rotates. Therefore, the spring load and the sliding torque gradually increase. As shown by reference numeral "P2", when the cam protrusion 48 is positioned at the tip portion 75b of the retraction guide portion 75 (in the comparative example, when the cam protrusion is positioned at the tip portion of the first guide groove), the spring load and the sliding torque of both the embodiment and the comparative example become the highest.

[0084] When the rod 40 is pushed from the state of P2, it is guided by the inclined tip portion 75b of the retraction guide portion 75, and due to the biasing force of the coil spring 50, the rod 40 rotates while being pressed in a direction opposite to the pushing direction. Therefore, the spring load and the sliding torque gradually decrease. As shown by reference numeral "P3", when the cam protrusion 48 is fitted into the retraction holding portion 73 (in the comparative example, when the cam protrusion is fitted into the second fitting groove), the spring load and the sliding torque of both the embodiment and the comparative example are maintained at a state lower than the state shown in P2.

[0085] Furthermore, when the rod 40 is pushed from the state of P3, the coil spring 50 is compressed, and while being guided by the protruding guide portion 77, the rod 40 rotates. As a result, the spring load and the sliding torque increase. As shown by the symbol "P4", when the cam protrusion 48 is positioned at the base end portion 77a of the protruding guide portion 77 (when the cam protrusion is positioned at the base end portion of the second guide groove in the comparative example), the spring load and the sliding torque of the embodiment and the comparative example become as high as those in the state shown by P2.

[0086] Then, when the rod 40 is pushed from the state of P4, while being guided by the protruding guide portion 77 and being pressed in the direction opposite to the pushing direction by the biasing force of the coil spring 50, the rod 40 rotates. Therefore, the spring load and the sliding torque gradually decrease. As shown by the symbol "P5", when the cam protrusion 48 fits again into the protruding holding portion 71 (when the cam protrusion fits into the first fitting groove in the comparative example), the spring load and the sliding torque of the embodiment and the comparative example become as low as those in the state shown by P1.

[0087] And in the case of the present embodiment, by adopting the configuration provided with the spacer 80 and the rotary sliding portion described above (see paragraphs 0075 to 0077, etc.), the spring load shown by the solid line in FIG. 12 and the sliding torque shown by the broken line in FIG. 12 are much lower than the spring load of the comparative example shown by the two-dot chain line in FIG. 12 and the sliding torque of the comparative example shown by the one-dot chain line in FIG. 12. It can be understood that the torsion of the coil spring 50 can be suppressed. In particular, regarding the sliding torque of the embodiment shown by the broken line in FIG. 12, there are almost no peaks or valleys, and the torque fluctuation is extremely small, and the effect of providing the spacer 80 and the rotary sliding portion is remarkable.

[0088] Also, in the embodiment shown in FIG. 4, the rotary sliding portion is provided at the closed end portion 43 and includes a closed end portion side protrusion 45 protruding toward the spacer 80 side and a protrusion contact surface 81 of the spacer 80 with which the closed end portion side protrusion 45 abuts.

[0089] According to the above aspect, since there is no need to provide a protrusion on the spacer side, the shape and structure of the spacer 80 can be simplified, and the spacer 80 can be easily manufactured.

[0090] Furthermore, in the first modification example shown in FIG. 9A, the second modification example shown in FIG. 9B, the third modification example shown in FIG. 9C, the fourth modification example shown in FIG. 10A, the fifth modification example shown in FIG. 10B, and the sixth modification example shown in FIG. 10C, the rotation sliding portion is provided on the spacers 80A, 80B, 80C, 80D, 80E, 80F, and includes spacer-side protrusions 85, 86, 87 that protrude toward the closed end portion 43 side and a closed end surface 43a of the closed end portion 43 that abuts against the spacer-side protrusions 85, 86, 87.

[0091] According to the above aspect, by providing the protrusions on the spacer side, the shape and structure of the rod 40 can be simplified, and the rod 40 can be easily manufactured.

[0092] Also, in the first modification example shown in FIG. 9A, the second modification example shown in FIG. 9B, and the third modification example shown in FIG. 9C, the spacers 80A, 80B, 80C are in a cap shape having a peripheral wall 84 that surrounds the outer periphery of one end portion of the coil spring 50.

[0093] According to the above aspect, since the outer periphery of one end portion of the coil spring 50 is covered by the peripheral wall 84 of the cap-shaped spacers 80A, 80B, 80C, for example, even if the coil spring 50 tilts when the rod 40 is pushed and rotated, the sliding resistance between the outer periphery of one end portion of the coil spring 50 and the inner periphery of the spring accommodation space 44 can be reduced, and it is difficult to affect the pushing and pulling operation and the rotating operation of the rod 40.

[0094] Also, when arranging the spacers 80A, 80B, 80C between one end portion of the coil spring 50 and the closed end portion 43, with the cap-shaped spacers 80A, 80B, 80C arranged on the outer periphery of one end portion of the coil spring 50, by inserting the coil spring 50 together with the spacers 80A, 80B, 80C into the spring accommodation space 44, the spacers 80A, 80B, 80C can be arranged between one end portion of the coil spring 50 and the closed end portion 43, and the assembly workability of the spacers 80A, 80B, 80C can be improved.

[0095] Furthermore, in the fourth modification example shown in FIG. 10A, the fifth modification example shown in FIG. 10B, and the sixth modification example shown in FIG. 10C, the spacers 80D, 80E, 80F have a support shaft 88 inserted into the inner circumference of one end portion of the coil spring 50.

[0096] According to the above aspect, when arranging the spacers 80D, 80E, 80F between one end portion of the coil spring 50 and the closing end portion 43, with the support shafts 88 of the spacers 80D, 80E, 80F inserted into the inner circumference of one end portion of the coil spring 50, the coil spring 50 together with the spacers 80D, 80E, 80F is inserted into the spring accommodation space 44, so that the spacers 80D, 80E, 80F can be arranged between one end portion of the coil spring 50 and the closing end portion 43, and the assembly workability of the spacers 80D, 80E, 80F can be improved.

[0097] Also, in the seventh modification example shown in FIG. 11, the end 55 of the seat winding portion 51 provided on one end portion side of the coil spring 50 protrudes toward the spacer 80 side, and the rotational sliding portion is composed of the end 55 of the coil spring 50 and the end contact surface 82a of the spacer 80 with which the end 55 of the coil spring 50 abuts.

[0098] According to the above aspect, since the rotational sliding portion can be provided using the end 55 of the coil spring 50, the rotational sliding portion can have a relatively simple structure, and the manufacturing cost of the telescopic device 10 can be reduced. Also, since no protrusion is provided on the spacer 80, there is no risk of the closing end portion 43 of the spring accommodation space 44 being cut off, and furthermore, the sliding resistance of the rotational sliding portion can also be reduced.

[0099] Note that the present invention is not limited to the above-described embodiments, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention.

Description of Reference Numerals

[0100] 10 Rotary telescopic device (telescopic device) 11 Body member 15 Cylindrical portion 20 First main body 30 Second main body 40 Rod 43 Blocking end portion 43a Blocking end face 44 Spring accommodation space 50 Coil spring 51, 53 Seated winding portion 55 Terminal 60 Motor 65 Lock retainer 70 Cam groove 80, 80A, 80B, 80C, 80D, 80E, 80F Spacer 81 Protrusion contact surface 82 Spring contact surface 83 Base portion 84 Peripheral wall 85, 86, 87 Spacer side protrusion 88 Support shaft

Claims

1. A main body member having a cylindrical portion with a circular inner circumference, a rod having a circular outer circumference and disposed within the cylindrical portion, held rotatably and axially movably with respect to the cylindrical portion, a spring accommodation space provided inside the rod, having a shape with a closed end portion disposed at one end side of the rod and an open end at the other end side, a coil spring disposed within the spring accommodation space for biasing the rod in a direction protruding from one end of the cylindrical portion, a cam mechanism formed between the rod and the cylindrical portion for axially moving the rod while rotating the rod, a spacer disposed between one end portion of the coil spring and the closed end portion, a rotary sliding portion is provided for locally contacting the spacer and the closed end portion so as to include a portion located on the axis of the coil spring between the spacer and the closed end portion, The coil spring is wound such that the end of the end coil portion provided at one axial end thereof has a smaller diameter than the other coil portions other than the end, and the end of the end coil portion contacts the spacer radially outward of the locally contacting portion between the spacer and the closed end portion, a rotary telescopic device characterized by this.

2. The rotary sliding portion, a closed end side protrusion provided on the closed end portion and protruding toward the spacer side, and a protrusion contact surface of the spacer with which the closed end side protrusion contacts, the rotary telescopic device according to Claim 1.

3. The rotary sliding portion, a spacer side protrusion provided on the spacer and protruding toward the closed end side, and a closed end surface of the closed end portion with which the spacer side protrusion contacts, the rotary telescopic device according to Claim 1.

4. The spacer has a cap shape having a peripheral wall surrounding the outer circumference of one end portion of the coil spring, the rotary telescopic device according to Claim 3.

5. The spacer has a support shaft inserted into the inner circumference of one end portion of the coil spring, the rotary telescopic device according to Claim 3.

6. A main body member having a cylindrical portion with a circular inner circumference, a rod having a circular outer circumference and disposed within the cylindrical portion, held rotatably and axially movably with respect to the cylindrical portion, a spring accommodation space provided inside the rod, having a shape with a closed end portion disposed at one end side of the rod and an open end at the other end side, a coil spring disposed within the spring accommodation space for biasing the rod in a direction protruding from one end of the cylindrical portion, A cam mechanism formed between the rod and the cylindrical portion, for axially moving the rod while rotating the rod; It has a spacer disposed between one end of the coil spring and the closing end portion; A rotary sliding portion is provided for locally abutting the spacer and one end of the coil spring so as to include a portion located on the axis of the coil spring between the spacer and one end of the coil spring; The end of the seat winding portion provided on one end side of the coil spring protrudes toward the spacer side; The rotary sliding portion consists of the end of the coil spring and; A rotary expansion and contraction device, characterized in that it consists of a terminal contact surface of the spacer with which the end of the coil spring abuts.

Images