JP2011220373A - Double locking device in pipe structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double locking device that achieves easy workability during extension/contraction adjustment and sure fixing performance in a pipe structure.SOLUTION: The double locking device 10 in a pipe structure includes a stepped locking mechanism and a non-stepped locking mechanism 50. The stepped locking mechanism is configured as follows. In a spring-coil clearance, a spring coil 35 is engaged with the outer-peripheral surface of an external pipe 20 while being sandwiched between a locking step 24 and an intermediate wall. In a locking-protrusion clearance, when a locking protrusion 22 is in a small-diameter clearance area, the locking protrusion is fitted to a locking groove 41 via a fitting insertion hole 23, and also, when the locking protrusion 22 is in a large-diameter clearance area, the locking protrusion is disengaged from the locking groove 41 via the fitting insertion hole 23. The non-stepped locking mechanism 50 is configured such that a pressing screw 43 formed at the tip of an inner pipe 40 is screwed into a tapered hole 52 of an expansion piece 51, brought into sliding contact with the external pipe 20, to allow the tapered hole 52 to expand or contract.

Description

  The present invention relates to a double lock device in a pipe structure, and more particularly to a double lock device including a step lock mechanism and a stepless lock mechanism in a pipe structure.

  As a conventional general pipe structure locking method, for example, scaffolding pipes found in construction work sites are connected and fixed by drilling connection holes in the pipes to be fitted, and screwing a lock pin with a screw into the holes. And a method of connecting and fixing by tightening with a tapered screw cap from above one end of the outer pipe used for clothespins and tipper bars, tapering into a slit, and In general, a method of connecting and fixing a spring pressure protrusion by projecting a hole formed in an inner pipe and an outer pipe used for a walking stick or the like is known.

  The fastening and fixing methods in the above pipe structure are dangerous because the lock pin protrudes, the taper tightening force is weak against impact force, and it can not be maintained over time, and dust and rainwater enter the connection hole There are many problems when used outside of the specialized field, such as poor design appearance.

  Therefore, in order to improve the above-mentioned problems, a “stretchable stick” described in Japanese Patent Application Laid-Open No. 2004-188093 (Patent Document 1) has been proposed and has become a publicly known technique. The technique proposed in Patent Document 1 is means for performing length adjustment and locking work simultaneously, and by rotating the coil spring in the circumferential direction by rotating the cylinder, the coil spring is expanded and tightened. The leg-side pipe can be expanded and contracted by this, and conversely, when the rotation operation is stopped, the coil spring naturally returns to the tightened state, and the leg-side pipe is fixed. At this time, the handle side, the pipe, the leg side pipe, and the cylinder are assumed to be in a strong locked state by the above-described connection configuration.

  However, according to the fastening / locking means of the above-mentioned Patent Document 1, the structure is complicated, and both hands are always required for the rotation work, and further, a strong twisting force that opposes the winding strength of the coil spring is required. It is difficult to adjust in weak women, elderly people, and sick people, and since the locked state is maintained only by the urging force of the coil spring, it relaxes over time when some strong impact force is applied. Because of the danger, it left a problem in safety and operability.

JP 2004-188093 A

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a double lock device that realizes easy workability at the time of expansion / contraction adjustment and reliable fixability in a pipe structure. It is.

  In order to achieve the above object, the present invention provides a double locking device in a pipe structure having two locking mechanisms, a step locking mechanism and a stepless locking mechanism, and an outer pipe having a large shaft diameter of a predetermined length. And an inner pipe that is slid into the outer pipe with a small shaft diameter of a predetermined length, and a slide cap that covers the boundary between the outer pipe and the inner pipe, A plurality of insertion holes for inserting the stop projection pieces are provided at predetermined intervals, and a locking step is provided at a predetermined position on the outer peripheral surface. The inner pipe is inserted into the outer pipe. A stepless locking mechanism is provided at the tip, and a plurality of annular lock grooves are provided around the outer peripheral surface at arbitrary equal intervals, and the slide cap includes the inner peripheral surface and the outer pipe or the inner pipe. Between the outer peripheral surface of the pipe An intermediate space is provided, and an intermediate wall that is in sliding contact with the outer peripheral surface of the outer pipe is provided at a predetermined position on the inner peripheral surface, and the gap space has an inclined portion between the small diameter gap and the large diameter gap across the intermediate wall. The step protrusion locking mechanism is divided into a spring protrusion gap for storing a spring coil and a spring coil gap for storing the spring coil. While being engaged with the outer peripheral surface of the outer pipe in a state of being sandwiched between walls, and when the locking projection piece is in the small-diameter clearance area in the locking projection piece gap, The stepless lock is configured to be in a state of being fitted into a lock groove, and to be in a state of being detached from the lock groove through the fitting insertion hole when the locking protrusion is in the large-diameter gap region. mechanism A taper hole having a taper portion with a small diameter at the tip of the inner pipe and a push screw formed at the tip of the inner pipe, and a slit engaged with the taper portion; A push screw hole is formed, and an expansion piece whose outer peripheral surface is in sliding contact with the inner peripheral surface of the outer pipe is connected. The tapered hole is configured to expand or contract by rotating the inner pipe in one direction. Adopting means.

  Moreover, this invention sets it as the structure by which the pipe structure is any one selected from a walking stick, a stick, a pole, an umbrella, a scaffold, a hand tool for farm work, or a tobiguchi in the double locking device in the said pipe structure. be able to.

  According to the double locking device in the pipe structure of the present invention, since it is locked by the double locking mechanism of the step locking mechanism and the stepless locking mechanism, it is safe and reliable in response to sudden impacts and changes over time. It has an excellent effect that it can be stretched and fixed.

  In addition, according to the double locking device in the pipe structure of the present invention, the arm strength is weak because the slide cap is slid and the inner pipe is rotated, so that the expansion and contraction can be easily adjusted without using force. It can also be used easily by the elderly and the sick.

  Furthermore, according to the double lock device in the pipe structure of the present invention, since the number of parts is small, there is an excellent effect that the light weight and the product cost can be reduced.

It is a disassembled perspective view which shows the whole structure of the double lock apparatus in the pipe structure concerning this invention. It is sectional explanatory drawing which shows the operating state of the level | step difference locking mechanism of the double locking device in the pipe structure concerning this invention. It is sectional explanatory drawing which shows the operating state of the level | step difference locking mechanism of the double locking device in the pipe structure concerning this invention. It is sectional explanatory drawing which shows the operation state of the level | step-difference locking mechanism of the double locking device in the pipe structure concerning this invention. It is explanatory drawing which shows the Example of the double lock apparatus in the pipe structure concerning this invention.

  The present invention is characterized in that the pipe structure is provided with two locking mechanisms, a step locking mechanism and a stepless locking mechanism, thereby realizing easy workability at the time of expansion / contraction adjustment and reliable fixing property. Embodiments of a double lock mechanism having a pipe structure according to the present invention will be described below with reference to the drawings.

  The double lock device 10 in the pipe structure according to the present invention is not limited to the embodiment and the illustrated structure described below, and can be changed as appropriate without departing from the spirit and configuration of the present invention. Is.

FIG. 1 is an exploded perspective view showing an overall configuration of a double lock device in a pipe structure according to the present invention.
The double lock device 10 in the pipe structure includes an outer pipe 20 having a predetermined shaft diameter increased and an inner pipe 40 slidably inserted into the outer pipe 20 with a predetermined shaft diameter decreased. And a slide cap 30 that covers the boundary between the outer pipe 20 and the inner pipe 40.

  The outer pipe 20 has a structure in which a plurality of insertion holes 23 into which the locking protrusions 22 are inserted are provided at predetermined intervals and a locking step 24 is provided at a predetermined position on the outer peripheral surface. Yes. The locking step 24 locks one end of the spring coil 35 and acts to limit the sliding amount of the slide cap 30 described later.

  As shown in the drawing, the fitting insertion hole 23 is a through-hole and is provided in the vicinity of the end where the inner pipe 40 is slid. Although the drawing shows the case where three fitting insertion holes 23 are provided, the number of the fitting insertion holes 23 is not particularly limited as long as it is plural. A locking projection piece 22 is inserted into each insertion hole 23, and the locking projection piece 22 is a divided arc-shaped locking plate material that can be inserted into the insertion insertion hole 23. It consists of

  The inner pipe 40 is provided with a stepless locking mechanism 50 at the distal end portion to be inserted into the outer pipe 20, and a plurality of annular lock grooves 41 are provided around the outer peripheral surface at arbitrary equal intervals. ing.

The configuration of the stepless locking mechanism 50 is as follows.
That is, a tapered portion 42 having a small tip diameter is formed at a tip portion of the inner pipe 40 to be inserted into the outer pipe 20, and a push screw 43 is further formed at the tip portion. The tip of the inner pipe 40 is connected with an extension piece 51 in which a tapered hole 52 that engages with the tapered portion 42 and a push screw hole 53 into which the push screw 43 is screwed are connected. The stepless locking mechanism 50 is configured.

The expansion piece 51 is formed of a soft material such as synthetic resin, and is screwed into the distal end of the push screw 43 of the inner pipe 40 and is fixed by a bolt 54 and a washer 55. The tapered hole 52 is provided with a slit, which facilitates the expansion function.
As shown in FIG. 3, the expansion piece 51 has a configuration in which an outer peripheral surface thereof is in sliding contact with an inner peripheral surface of the outer pipe 20, and the inner pipe 40 is rotated in one direction, thereby When the taper hole 52 is expanded or contracted, the taper hole 52 is configured to act in a locked state or a released state.

  The lock groove 41 is for ensuring the fixed state of the outer pipe 20 and the inner pipe 40 by fitting the locking protrusions 22 in the step lock mechanism 21 described later.

  As shown in FIGS. 2 to 3, the slide cap 30 is provided with a gap space 31 between the inner peripheral surface thereof and the outer peripheral surface of the outer pipe 20 or the inner pipe 40, and the predetermined position on the inner peripheral surface. An intermediate wall 37 that is in sliding contact with the outer peripheral surface of the outer pipe 20 is provided. Therefore, the gap space 31 is divided into a locking protrusion piece gap 34 and a spring coil gap 36 across the intermediate wall 37. The locking projection piece gap 34 includes a small-diameter gap 32 and a large-diameter gap 33, which are connected via an inclined portion 38. The spring coil gap 36 functions as a portion for storing the spring coil 35.

  The coil spring 35 is engaged with the outer peripheral surface of the outer pipe 20 while being sandwiched between the locking step 24 and the intermediate wall 37. The coil spring 35 acts to forcibly return the slide cap 30 to its original position when the slide cap 30 is slid.

  The step locking mechanism 21 is configured to act in a locked state or a released state by fitting the locking protrusions 22 into the lock grooves 41 or removing the locking protrusions 22 from the lock grooves 41.

  As shown in FIGS. 2 to 3, the specific structure of the step lock mechanism 21 is such that the slide cap 30 is slid in the length direction so that the locking protrusions are located within the locking protrusion gap 34 region. While the inner diameter portion of the piece 22 is in contact with the outer peripheral surface of the inner pipe 40 and the lock groove 41 and the outer diameter portion of the locking projection piece 22 is in contact with the inner peripheral surface of the slide cap 30, the outer pipe 20 and the inner pipe It floats in a direction substantially orthogonal to the longitudinal axis direction of 40.

Specifically, the small-diameter gap 32 constituting the locking projection piece gap 34 acts to push the locking projection piece 22 into the lock groove 41 to be in a locked state.
Conversely, the large-diameter gap 33 that constitutes the locking protrusion piece gap 34 acts to release the locking protrusion piece 22 from the lock groove 41 and to release the locking protrusion piece 22.

  With respect to the double locking device 10 in the pipe structure according to the present invention having the above configuration, the operating states of the step locking mechanism 21 and the stepless locking mechanism 50 will be described in more detail below.

  2 and 3 are cross-sectional explanatory views showing the operation state of the step lock mechanism 21 of the double lock device 10 in the pipe structure of the present invention. FIG. 2 shows a case where the lock state is changed to the release state, and FIG. It shows the case of changing from the released state to the locked state.

When the step lock mechanism 21 is changed from the locked state to the released state, first, as shown in FIG. 2, the slide cap 30 is slid until the outer diameter portion of the locking protrusion 22 is positioned in the large-diameter gap 33 region. Let
Next, the inner pipe 40 is forcibly slid in the longitudinal axis direction so that the inner diameter portion of the locking protrusion 22 is naturally removed from the lock groove 41 and the locked state between the outer pipe 20 and the inner pipe 40 is completely released. Is done.
At this time, the locking projection piece 22 is in a state where the inner diameter portion is in sliding contact with the outer peripheral surface of the inner pipe 40 and the outer diameter portion is in the large diameter gap 33 of the slide cap 30.

  When the step lock mechanism 21 is changed from the released state to the locked state, the slide cap 30 is first released as shown in FIG. As a result, the slide cap 30 tries to return to the original state by the force of the coil spring 35, but when the inner diameter portion of the locking projection piece 22 is in contact with the outer peripheral surface of the inner pipe 40, the outer diameter of the locking projection piece 22 Since the portion cannot move from the large-diameter gap 33 into the small-diameter gap 32, the outer-diameter portion of the locking projection piece 22 remains in the region of the inclined portion that connects the small-diameter gap 32 and the large-diameter gap 33. The slide cap 30 is also returned to that position.

  Next, by sliding the inner pipe 40 in the longitudinal axis direction, the inner diameter portion of the locking projection piece 22 is naturally fitted into the lock groove 41 where the locking projection piece 22 first encounters, so The pipe 40 is locked. At this time, the outer diameter portion of the locking projection piece 22 is pushed by the inclined portion connecting the small diameter gap 32 and the large diameter gap 33 by the force of the slide cap 30 to return to the original position, and the inner diameter portion of the locking projection piece 22 Is naturally fitted into the lock groove 41. Then, the outer diameter portion of the locking protrusion 22 finally moves into the small diameter gap 32 region, and the slide cap 30 is completely returned to the original position.

  FIG. 4 is a cross-sectional explanatory view showing the operating state of the stepless locking mechanism 50 of the double locking device 10 in the pipe structure according to the present invention, and FIG. FIG. 4B shows a case where the unlocked state is set to the locked state.

In order to change the stepless locking mechanism 50 from the locked state to the released state, it is sufficient to rotate the inner pipe 40 counterclockwise as shown in FIG.
That is, by rotating the inner pipe 40 counterclockwise, the push screw 43 at the tip of the inner pipe 40 screwed into the push screw hole 53 of the expansion piece 51 is returned, and thereby the taper that has pushed the expansion piece 51 widened. The portion 42 is returned from the tapered hole portion 52 of the expansion piece 51 and the expansion piece 51 is reduced, and the pressing state of the inner peripheral surface of the outer pipe 20 by the outer peripheral surface of the expansion piece 51 is released.

When the stepless locking mechanism 50 is changed from the released state to the locked state, the inner pipe 40 is rotated clockwise as shown in FIG.
That is, when the inner pipe 40 is rotated clockwise, the pushing screw 43 at the tip of the inner pipe 40 that is screwed into the pushing screw hole 53 of the expansion piece 51 enters, thereby tapering to the tapered hole portion 52 of the expansion piece 51. The part 42 enters and pushes and expands the expansion piece 51, and the outer peripheral surface of the expansion piece 51 presses the inner peripheral surface of the outer pipe 20.

  In the stepless locking mechanism 50, the outer peripheral surface of the extension piece 51 is not expanded by the tapered portion 42 so that the extension piece 51 does not rotate at the same time when the inner pipe 40 is rotated. Even in the state, it is configured so as to be in sliding contact with the inner peripheral surface of the outer pipe 20 at all times.

FIG. 5 is an explanatory view showing an embodiment of the double lock device 10 in the pipe structure according to the present invention.
In other words, FIG. 5 (a) is an overall perspective view when the walking cane 60 is adopted as the pipe structure, and FIG. 5 (b) is an exploded perspective view thereof. A handle 61 is provided at one end of the pipe 20, and a rubber foot 62 is provided at the other end of the inner pipe 40, and the step locking mechanism 21 provided at the boundary between the outer pipe 20 provided with the handle 61 and the inner pipe 40, By providing the two locking mechanisms of the stepless locking mechanism 50 provided at the tip of the inner pipe 40 in the pipe 20, it functions as a walking cane 60 employing the double locking mechanism according to the present invention.

  The present invention is not limited to the walking cane 60 described above, and can be applied to any pipe structure such as a walking cane, a stick, a pole, an umbrella, a scaffold, a hand tool for farm work, or a tobiguchi. By adopting the present invention, Since the dual effect of the safety of the pipe structure and the simplification of the installation / removal operation is achieved, the industrial applicability of the double lock device 10 in the pipe structure according to the present invention is considered extremely high. To do.

DESCRIPTION OF SYMBOLS 10 Double lock apparatus 20 Outer pipe 21 Step locking mechanism 22 Locking protrusion 23 Insertion hole 24 Locking step 30 Slide cap 31 Gap space 32 Small diameter gap 33 Large diameter gap 34 Locking protrusion piece gap 35 Coil spring 36 Coil spring Gap 37 Intermediate wall 38 Inclined portion 40 Inner pipe 41 Lock groove 42 Taper portion 43 Push screw 50 Stepless lock mechanism 51 Expansion piece 52 Taper hole 53 Push screw hole 54 Holding screw 55 Washer 60 Walking stick 61 Handle 62 Rubber foot

Claims (2)

A double locking device in a pipe structure having two locking mechanisms, a step locking mechanism and a stepless locking mechanism,
Covering the boundary between the outer pipe and the inner pipe, the outer pipe having a larger shaft diameter of a predetermined length, the inner pipe slidingly inserted into the outer pipe with the smaller shaft diameter of the predetermined length A slide cap,
The outer pipe has a plurality of insertion holes for inserting the locking protrusions around the predetermined interval, and a locking step is provided at a predetermined position on the outer peripheral surface.
The inner pipe is provided with a stepless locking mechanism at a tip portion inserted into the outer pipe, and a plurality of annular lock grooves are provided around the outer peripheral surface at arbitrary intervals.
The slide cap is provided with a gap space between an inner peripheral surface thereof and the outer pipe or the outer peripheral surface of the inner pipe, and an intermediate wall that is in sliding contact with the outer peripheral surface of the outer pipe is provided at a predetermined position on the inner peripheral surface. The gap space is divided into a locking projection piece gap formed by connecting a small diameter gap and a large diameter gap via an inclined portion across the intermediate wall, and a spring coil gap for storing the spring coil,
In the spring coil gap, the step lock mechanism is engaged with the outer peripheral surface of the outer pipe while the spring coil is sandwiched between the locking step and the intermediate wall, and in the locking protrusion gap. When the locking projection piece is in the small-diameter gap region, the locking projection piece is fitted into the lock groove via the fitting insertion hole, and when the locking projection piece is in the large-diameter clearance region, the insertion insertion hole Is configured to be out of the lock groove via,
The stepless locking mechanism has a taper portion with a small diameter at the tip of the inner pipe and a push screw formed at the tip, and engages the taper at the tip. A tapered hole having a slit and a push-in screw hole are formed, and an expansion piece whose outer peripheral surface is in sliding contact with the inner peripheral surface of the outer pipe is connected. The taper hole is expanded or rotated by rotating the inner pipe in one direction. A double locking device in a pipe structure, characterized in that it is configured to shrink.   2. The double lock device according to claim 1, wherein the pipe structure is any one selected from a walking stick, a stick, a pole, an umbrella, a scaffold, a hand tool for farm work, and a tobiguchi. Double locking device in the described pipe structure.

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