JP5368338B2 - Telescopic pole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive expansion pole which is reduced in the number of part items and is easy to manufacture and assemble. <P>SOLUTION: The expansion pole 1 includes: a first strut portion 2 having a deformed inner surface having an arc chord portion 4 and a circular portion 5; a second strut portion 3; a shaft body 7 having a threaded portion 9 and an intermediate non-threaded portion 11 provided with an intermediate flange 10, the shaft body being fixed to the second strut portion 3; a sleeve 12 with a tapered outer surface to be fitted to the intermediate non-threaded portion 11; a working nut 13 to be screwed to the threaded portion 9; and a plurality of split grip strips 16 each having an inward flange 18 to be fitted to an annular dent 17 between an extended head 14 of the working nut and a nut flange 15 and having an outside profile matched to the deformed inner surface of the first strut portion, the split grip strips being slid on and engaged with an outer surface 12A of a tapered sleeve. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a telescopic pole having at least one pair of strut portions each including a first strut portion and a second strut portion that are inserted and removed from each other.

  As such an expansion / contraction (slide) pole, for example, there is one described in Patent Document 1 (Japanese Utility Model Laid-Open No. 1-95701) which is the prior application of the present applicant.

  The telescopic (slide) pole described in Patent Document 1 has a large-diameter tube column, that is, a medium-diameter tube column that fits into the first column portion, that is, the angular shaft portion 11 at the end of the second column portion. The true bar portion 7 is inserted.

  First and second anti-slip collar portions 12 and 13, first and second tightening collar portions 17 and 19, and metal collar portion 14 each having a square hole are fitted into the square shaft portion 11, and a washer 20. Then, these inserted members are fixed by the holding screw 20a.

  The central axes of the square holes in the first and second fastening collar portions 17 and 19 are formed so as to be eccentric with respect to the axes of the first and second fastening collar portions 17 and 19. Further, the first and second tightening collar portions 17 and 19 are inserted into the angular shaft portion 11 with their angles shifted from each other.

  In such a configuration, when the second support column portion is screwed into the first support column portion at an arbitrary expansion / contraction position, the first and second tightening collar portions 17 and 19 fixed to the second support column portion become the first support column. A strong pressure is applied to the inner surface of the part, and a lock is generated at this extended position.

Japanese Utility Model Publication No. 1-95701

  However, this conventional telescopic pole has a large number of parts, and only a part of the peripheral surface of the first and second tightening collar portions 17 and 19 is pressure-bonded to the inner surface of the first support column portion. Large load carrying capacity cannot be obtained.

  Accordingly, an object of the present invention is to obtain a telescopic pole that has a small number of parts, is easy to manufacture and assemble, and has a high load support capability.

In order to achieve this object, the telescopic pole of the present invention is an telescopic pole having at least one pair of strut portions consisting of a first strut portion and a second strut portion that are inserted and removed from each other.
A hollow provided with a deformed inner surface having an arc chord portion linearly connecting ends of at least one arc portion on the circular inner surface and at least one arc-shaped portion adjacent to the arc chord portion when viewed in cross section The first strut portion of
A second strut portion that is fitted to the first strut portion so that one end can be inserted and removed, and a closing portion that closes the one end is provided;
A cylindrical shaft body that is fixed to the closing portion of the second support column portion, wherein the fixing portion is fixed to the closing portion of the end portion of the second support column portion, at an end opposite to the fixing portion. The shaft body having a screw rail portion, and an intermediate screw-less portion having an intermediate flange protruding radially outward between the fixing portion and the screw rail portion;
A sleeve having a tapered outer surface, wherein the sleeve is loosely fitted around the intermediate screw-less portion from the fixed portion side end portion of the shaft body toward the intermediate flange, and in this state, the shaft body is moved to the second column portion. A tapered sleeve that is rotatable about the shaft body but restricted in axial movement between an intermediate flange of the shaft body and an end face of the second post portion by being secured to the closure portion of the shaft body; ,
An action nut that is screwed into the screw rail portion of the shaft body, and has an outer surface that is similar to the deformed inner surface of the first strut portion at the free end side end of the screw rail portion in the shaft body. And a nut that protrudes in a radial direction with a smaller diameter than the expansion head at an end of the shaft body facing the intermediate flange at the end facing the intermediate flange. A working nut having a flange;
Having an inward flange that fits into an annular recess between the enlarged head of the working nut and the nut flange, at least on the outer surface of the ends on both sides, adapted to the deformed inner surface of the first strut portion, An outer contour having a shape that extends over both of the arc-shaped portion and the arc chord portion of the deformed inner surface, and the inner surface of the end opposite to the inward flange is against the outer surface of the tapered sleeve A plurality of divided grip strips that are slidably engaged are provided.

According to the present invention, a simple columnar shaft body can be obtained without providing a taper bolt part and a taper nut part as in the prior art.
Further, the shaft body has a straight thread rail portion instead of a taper shape at an end opposite to the fixing portion, and an intermediate flange protruding outward in the radial direction between the fixing portion and the screw rail portion. An intermediate threadless portion is provided, and a threaded nut portion of the shaft body is only required to be screwed with a working nut having a simple deformed outer surface in a first support column portion having a simple deformed inner surface.
In addition, a simple sleeve having a tapered outer surface is attached to the intermediate thread-free portion of the shaft body, and a plurality of divided grip strips that slide-engage with the outer surface of the tapered sleeve need only be provided.
With this simple configuration, when the second strut portion is rotated with respect to the first strut portion at an arbitrary expansion / contraction position, the action nut translates in the direction of the tapered sleeve along the thread rail portion of the shaft body, The expanding head of the action nut presses the split grip strip in the expanding direction along the tapered outer surface of the sleeve, and the split grip strip receives the force directed radially outwardly at the first strut portion. It can be crimped to the inner surface and, therefore, both struts can be locked in this arbitrarily extended position.

In a preferred embodiment, the thread rail portion of the shaft body is a multi-rail screw having 4 to 8 threads. According to this configuration, the translational movement of the action nut is quick and smooth.
Further, a plurality of arc chord portions are provided for each equiangular pitch, preferably four for each 90 ° angular pitch. According to this configuration, alignment during assembly is facilitated.
More preferably, one end portion of the first support column portion is a closed end portion with a closing portion, and the second support column portion is also provided with a deformed inner surface at least partially similar to the first support column portion. According to this configuration, by providing one or more pairs of the first column part and the second column part, a plurality of pairs are sequentially added to form a long telescopic pole without using a column part having a long length. be able to.
In the following, preferred embodiments of the present invention will be described with reference to the drawings.

1 is an exploded perspective view of a preferred embodiment of a telescopic pole according to the present invention. It is a side view of the state which assembled | attached the 1st support | pillar part and 2nd support | pillar part of the expansion-contraction pole shown in FIG. It is a longitudinal cross-sectional view on the AA line in FIG. It is the end elevation seen from the direction of B in FIG. It is the end elevation seen from the direction of C in FIG. It is a disassembled perspective view in suitable 2nd Embodiment of the expansion-contraction pole by this invention. It is a disassembled perspective view which shows the state which further decomposed | disassembled the disassembled perspective view of FIG. 6 and 7 show the unlocked state in the assembled state, (a) is a side view, (b) is a longitudinal sectional view as viewed in the direction A on the line I-I in (a), ( (c) is the longitudinal cross-sectional view seen in the direction of B on the II line in (a). 6 and 7 show an intermediate stage state in which locking is performed in the assembled state, in which (a) is a side view, and (b) is a longitudinal section viewed in the direction A on the line II in (a). FIG. 5C is a longitudinal sectional view taken in the direction B on the II line in FIG. 6 and 7 show the locked state in the assembled state, (a) is a side view, (b) is a longitudinal sectional view as viewed in the direction A on the line II in (a), (c) ) Is a longitudinal sectional view taken in the direction B on the II line in FIG.

  FIG. 1 shows an exploded perspective view of a telescopic pole 1 which is a preferred embodiment according to the present invention. The telescopic pole 1 of this embodiment has at least one pair of strut portions consisting of a first strut portion 2 and a second strut portion 3 that are inserted and removed from each other. In the drawing, the short first column portion 2 and the second column portion 3 are shown, but in actuality, the length is longer than that shown in the drawing.

  The first strut portion 2 has an arc chord portion 4 that linearly connects ends of at least one arc portion on the circular inner surface and at least one arc shape adjacent to the arc chord portion 4 when viewed in cross section. The outer surface provided with the deformed inner surface having the portion 5 is a hollow cylindrical body.

  In the illustrated embodiment, four arc chord portions 4 are provided at 90 ° angular pitches in the circumferential direction of the inner surface of the first support column portion 2 (see FIG. 4), but pitches other than 90 ° are provided. A plurality can be provided for each.

  A closing portion 6 is provided at one end portion of the second strut portion 3 that is fitted to the first strut portion 2 so that one end portion can be inserted and removed. A cylindrical shaft body 7 is fixed to the closing portion 6 of the second support column portion 3.

  The shaft body 7 includes a fixing portion 8 that is fixed to the closing portion 6 at the end portion of the second support column portion 3, a screw rail portion 9 at an end portion opposite to the fixing portion, and a fixing portion 8 and a screw rail portion 9. Having an intermediate unthreaded portion 11 having an intermediate flange 10 projecting radially outward therebetween. In the illustrated embodiment, a screw hole is provided in the closing part 6 at the end of the second support column part 3 and a male screw part is provided in the fixing part 8 of the shaft body 7 and is fixed by screw connection. Alternatively or additionally In addition, it can be fixed by other means.

  A sleeve 12 having a tapered outer surface 12A is loosely fitted to the intermediate threadless portion 11 of the shaft body 7 from the end portion of the shaft body on the fixing portion 8 side toward the intermediate flange 10. In this state, when the shaft body 7 is fixed to the closing portion 6 of the second support column portion 3, the sleeve 12 is arranged around the shaft body 7 between the intermediate flange 10 of the shaft body 7 and the end surface 3 </ b> A of the second support column portion 3. However, the movement in the axial direction is restricted.

  An action nut 13 is screwed into the thread rail portion 9 of the shaft body 7. As shown in FIG. 4, the action nut 13 has a similar outer surface on the deformed inner surface of the first strut portion 2 at the free end of the screw rail portion 9 in the shaft body 7. An enlarged head 14 that is fitted to the inner surface of the column portion with a slight clearance is provided, and a nut flange 15 that protrudes in a radial direction with a smaller diameter than the enlarged head is provided at an end of the shaft body 7 facing the intermediate flange 10. Provide.

  A plurality of split grip strips 16 that engage with each other of the sleeve 12 and the working nut 13 are provided in the first column portion 2 so as to be separated from each other in the circumferential direction. In the illustrated embodiment, two split grip strips 16 are provided facing each other in the diametrical direction. Each split grip strip 16 is provided with an inward flange 18 that fits into an annular recess 17 between the enlarged head 14 of the working nut 13 and the nut flange 15.

  As shown in FIG. 5, the outer surface of at least both ends of each divided grip strip 16 conforms to the deformed inner surface of the first column portion 2, and the arc chord portion 4 and the arc-shaped portion 5 of the deformed inner surface are formed. An outer contour having a shape extending over both parts is provided, and the inner surface of the end opposite to the inward flange 18 is slidably engaged with the tapered outer surface 12A of the sleeve 12.

  With such a configuration, the first support column 2 is rotated relative to the first support column 2 in the locking direction at an arbitrary expansion / contraction position of the first support column 2 and the second support column 3, thereby the first support column 2. The action nut 13 whose rotation is restricted inside the portion 2 translates in the direction of the sleeve 12 along the screw rail portion 9 of the shaft body 7 fixed to the end portion of the second column portion 3, and this translational movement is performed. At this time, since the enlarged head 14 of the action nut 13 presses the split grip strip 16 in the expanding direction of the tapered outer surface 12A of the sleeve 12, the split grip strip 16 expands radially outward and the first support column. The first strut portion 2 and the second strut portion 3 are locked at the arbitrary expansion / contraction position by crimping to the inner surface of the portion 2.

  In order to release the lock, force is applied in a direction to separate the first support column part 2 and the second support column part 3 from each other (at this time, the split grip strips 16 that are firmly attached to the action nut 13 are connected to each other). As the inward flange 18 moves in the recess 17 of the working nut, the sleeve 12 moves outward in the axial direction where the contact area with the inner surface of the split grip strip 16 is reduced, and the radial direction of the split grip strip 16 is increased. When the amount of outward expansion is reduced), when the relative rotation is performed in the direction opposite to the locking direction, the action nut 13 translates in the distal direction of the screw rail portion 9 of the shaft body 7. After this, the nut flange 15 of the working nut 13 engages with the inward flange 18 of the split grip strip 16 and moves in a direction to pull the split grip strip 16 away from the sleeve 12. The pressure bonding to the inner surface of the first support column portion 2 is eliminated, and the lock is released. A stopper washer 19 that prevents the action nut 13 from coming off is attached to the tip of the screw rail portion 9.

  In order to make the translation movement of the action nut 13 along the screw rail portion 9 of the shaft body 7 quick and smooth, it is preferable that the screw rail portion 9 is a multi-rail screw having four to eight threads.

  Further, in the illustrated embodiment, only a pair of the first support column portion 2 and the second support column portion 3 are shown, and the end portions on both sides of the first support column portion 2 are shown as open ends. One end portion is a similar closed end portion having the closing portion 6 of the second column portion 3, and the inner surface of the second column portion 3 is also at least partially provided with a deformed inner surface similar to the first column portion. Each pair can be successively added to form a long telescopic pole without using a column portion having a long length.

  Next, the telescopic pole 21 of the second preferred embodiment according to the present invention will be described with reference to FIGS. As shown in FIGS. 6 and 7, the telescopic pole 21 in the second embodiment is provided with three divided grip strips 36, and these three divided grip strips 36 are slid only in the axial direction of the pole. The gap member 46 is interposed between the adjacent divided grip strips 36 to prevent the relative rotation with respect to the first column portion 2 around the pole axis in the first column portion 2. This is different from the first embodiment. An end cap 23 is fixed to the end portion 22 of the first support column portion 2 with a set screw 24. Furthermore, the nut flange 15 in the first embodiment that is continuous in the circumferential direction of the working nut 13 is provided as a discontinuous protrusion 25. An inward flange 38 that can be engaged with the projection 25 is provided on each split grip strip 36. Although not shown in FIG. 3, the stopper washer 19 is fixed by the E-shaped retaining ring 20.

  A closing portion 26 is provided at one end of the second support column portion 3 that is fitted to the first support column portion 2 so that one end portion can be inserted and removed. In the first embodiment, the closing portion 26 is shown as an integral configuration with respect to the second support column portion 3, but in the second embodiment, the closure portion 26 is a separate configuration, and is fixed to the second support column portion 3 with a pin 27, and It is also fixed to the fixing part 8 of the body 7. A cylindrical shaft body 7 is fixed to the closing portion 6 of the second support column portion 3. A stopper collar 28 is fixed to the closing portion 26. The first support column 2 and the second support column 3 are prevented from dissociating from each other due to the engagement between the end cap 23 fixed to the first support column 2 and the stopper collar 28 fixed to the second support column 3. .

  A dry self-lubricating type thrust washer 29 is arranged between the sleeve 12 and the closing portion 26, and the dry self-lubricating type thrust washer 29 is also provided between the intermediate flange 10 of the shaft body 7 and the sleeve 12 having the tapered outer surface 12A. Self-lubricating type thrust washers 30, 31 are arranged.

  The process from the unlocked state to the locked state through the tightening intermediate stage and the reverse process will be described below with reference to FIGS. 8 to 10 show the telescopic pole 21 in a horizontal state, but in actuality, the second column portion 3 is used with the second column portion 3 facing upward.

  In the unlocked state shown in FIG. 8, the action nut 13 screwed into the screw rail portion 9 of the shaft body 7 slides in the first column portion 2 until it is pressed against the stopper washer 19. The split grip strips 36 and the gap member 46, which are free to move in the axial direction within the column portion 2, are pressed against the expansion head 14 of the action nut 13 by gravity.

  In this state, when the worker rotates the second column part 3 clockwise with respect to the first column part 2, as shown in FIG. 9, the action nut 13 slides in the first column part 2 and is screwed. It moves rightward (actually upward) with respect to the shaft body 7 along the rail portion 9. At this time, the action nut 13 pushes up the split grip strip 36 on a tapered outer surface 12A that expands toward the right side (actually upward) of the sleeve 12. At this time, the rotation of the second support column portion 3, and consequently the shaft body 7, causes dry self-lubrication between the sleeve 12 fitted on the shaft body 7 and the shaft end closing portion 6 and between the sleeve and the intermediate flange 10. Since the type of thrust washers 29 and 30, 31 are interposed, the sleeve 12 does not rotate relative to the shaft body 7 without being transmitted to the sleeve 12, and therefore the split grip strip 36 is located on the right side of the sleeve 12. Move smoothly (upward). In this way, the split grip strip 36 rides on the tapered outer surface 12A that expands toward the right side (actually upward) of the sleeve 12, so that the split grip strip 36 is in contact with the inner surface of the first column portion 2 and the sleeve. It is clamped tightly between the outer surfaces of 12 and generates a fixing force.

  In this state, if the tightening rotation of the second column part 3 with respect to the first column part 2 is stopped, the load due to the weight of the second column part 3 itself and the weight of the tent or camouflage placed on the second column part 3 is applied. Acting on the first strut portion 2, the second strut portion 3 leaves the split grip strip 36 clamped in the first strut portion 2, and a working nut 13 attached to the second strut portion 3, The shaft 7 and the sleeve 12 are slightly lowered to the left (actually downward), so that the split grip strip 36 is more tightly clamped between the inner surface of the first column portion 2 and the outer surface of the sleeve 12, The locked state shown in FIG. 10 is obtained.

  In order to release the locked state shown in FIG. 10, the worker rotates the second column part 3 in a direction (counterclockwise) to release the lock with respect to the first column part 2. At this time, the projection of the action nut 13 engages with the inward flange 38 of the split grip strip 36, and the action nut 13 moves to the left along the screw rail portion 9 of the shaft body 7 in the first column portion 2 ( Actually, it moves downward) and moves in the direction of pulling the split grip strip 36 away from the sleeve 12. Thereby, the split grip strips 36 are released from the clamped state, become free, and are in the state shown in FIG. 8 in which the locked state is released.

  The telescopic pole of the present invention can be used, for example, as a support for attaching a fake material or extending a tent.

DESCRIPTION OF SYMBOLS 1 Telescopic pole 2 1st support | pillar part 3 2nd support | pillar part 3A End face 4 Arc chord part 5 Arc-shaped part 6 Closure part 7 Shaft body 8 Adhering part 9 Screw rail part 10 Intermediate flange 11 Intermediate screw no part 12 Sleeve 12A With taper External surface 13 Action nut 14 Expanding head 14
15 Nut flange 16 Split grip strip 17 Annular recess 18 Inward flange 19 Stopper washer 20 E-type retaining ring 20
21 Telescopic pole 22 End 22 of first support column 2
23 End Cap 24 Set Screw 25 Protrusion 26 Closure 27 Pin 28 Stopper Collar 29 Dry Self-Lubrication Type Thrust Washer 30 Dry Self-Lubrication Type Thrust Washer 31 Dry Self-Lubrication Type Thrust Washer 36 Divided Grip Strip 46 Spacing Member

Claims (6)

In the telescopic pole having at least one pair of strut portions consisting of a first strut portion and a second strut portion that are inserted and removed from each other,
A hollow provided with a deformed inner surface having an arc chord portion linearly connecting ends of at least one arc portion on the circular inner surface and at least one arc-shaped portion adjacent to the arc chord portion when viewed in cross section The first strut portion of
A second strut portion that is fitted to the first strut portion so that one end can be inserted and removed, and a closing portion that closes the one end is provided;
A cylindrical shaft body fixed to the closing portion of the second support column portion, the fixing portion being attached to the closing portion of the end portion of the second support column portion, and a screw rail at the end opposite to the fixing portion. The shaft body, and an intermediate threadless portion having an intermediate flange projecting radially outward between the fixing portion and the screw rail portion;
A sleeve having a tapered outer surface, wherein the sleeve is loosely fitted around the intermediate screw-less portion from the fixed portion side end portion of the shaft body toward the intermediate flange, and in this state, the shaft body is moved to the second column portion. A tapered sleeve that is rotatable about the shaft body but restricted in axial movement between an intermediate flange of the shaft body and an end face of the second post portion by being secured to the closure portion of the shaft body; ,
An action nut that is screwed into the screw rail portion of the shaft body, and has an outer surface that is similar to the deformed inner surface of the first strut portion at the free end side end of the screw rail portion in the shaft body. And a nut that protrudes in a radial direction with a smaller diameter than the expansion head at an end of the shaft body facing the intermediate flange at the end facing the intermediate flange. A working nut having a flange;
Having an inward flange that fits into an annular recess between the enlarged head of the working nut and the nut flange, at least on the outer surface of the ends on both sides, adapted to the deformed inner surface of the first strut portion, An outer contour having a shape straddling a part of both the arc chord portion and the arc-shaped portion of the deformed inner surface, and the inner surface of the end opposite to the inward flange is in relation to the outer surface of the tapered sleeve A telescopic pole comprising a plurality of split grip strips that are slidably engaged.   The telescopic pole according to claim 1, wherein the screw rail portion of the shaft body is a screw of a plurality of rails.   The telescopic pole according to claim 1 or 2, wherein the thread rail portion of the shaft body is a multi-rail screw having 4 to 8 threads.   The telescopic pole according to claim 1, wherein a plurality of the arc chord portions are provided for each equiangular pitch.   The telescopic pole according to claim 4, wherein four arc chord portions are provided for every 90 ° angle pitch.   6. One end portion of the first support column portion is a closed end portion with a closing portion, and the second support column portion is also provided with a deformed inner surface at least partially similar to the first support column portion. The telescopic pole as described in any one of these.

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