JP2005321099A - Articulated structure of rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a first rod and a second rod to be coupled to each other without backlash when coupling them with male and female engagement. <P>SOLUTION: An articulated structure is constituted by the male and female engagement of the first rod 10 and the second rod 20. A rib 23 for preventing rotation is provided on one side of the second rod 20, and a notch 12 for preventing rotation is provided on one side of the first rod 10. The instant when an engagement protrusion 33 of the first rod 10 is engaged with an engagement hole 21 of the second rod 20, the rib 23 for preventing rotation of the second rod 20 and the notch 12 for preventing rotation of the first rod 10 are made possible to be engaged with each other at least in the circumference of both of the rods 10, 20. Then at the time of the engagement of the rib 23 for preventing rotation and the notch 12 for preventing rotation, at least an edge on one side of the rib 23 for preventing rotation is brought into collision with an opening edge of the notch 12 for preventing rotation. Then the collision surfaces of the rib 23 and the notch 12 are constituted by being deformed and/or cut away by each other, thus they can be engaged with each other without clearance in the circumference. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a connecting structure of rods.

When connecting the first rod and the second rod by male-female connection as described in Patent Documents 1 and 2, as the connecting structure of the rod of the cleaning tool handle, the handle handle, etc., the radial direction of the first rod An engagement protrusion that is repelled by the first rod is provided on the peripheral surface of the first rod, and an engagement hole that engages and locks the engagement protrusion of the first rod on the peripheral surface of the second rod; Some of them are provided with a guide groove extending from the front edge portion to the engagement hole so as to be guided. Both rods are connected by guiding the engaging protrusion of the first rod while pushing it up by the guide groove of the second rod and elastically engaging and locking it in the engaging hole of the second rod.
JP2001-317513 JP2003-102664

The conventional techniques of Patent Documents 1 and 2 have the following problems.
(1) The first rod and the second rod are maintained in the connected state by the engagement locking of the engagement protrusions and the engagement holes, but between the protrusions and the holes in the engagement relationship. Inevitably with a gap. For this reason, the 1st rod and the 2nd rod produce the play of the axial direction and the circumferential direction based on those gaps in the connected state.

  (2) The engaging protrusion of the first rod is pushed up by the guide groove of the second rod and accumulates an elastic force, and then is elastically fitted and locked into the engaging hole of the second rod. For this reason, the engagement depth of the engagement protrusion with respect to the engagement hole cannot be made larger than the height at which the engagement protrusion pushes up the guide groove and gets over the guide groove, and is relatively small. Also by this, the 1st rod and the 2nd rod are easy to produce backlash in those axial directions and the peripheral direction in a connection state.

  An object of the present invention is to connect both rods without play when the first rod and the second rod are connected by male-female connection.

  According to the first aspect of the present invention, when the first rod and the second rod are connected to each other by male-female connection, an engagement protrusion that is repelled in the radial direction of the first rod is provided on the peripheral surface of the first rod. An engaging hole in which the engaging protrusion of the first rod is fitted and locked on the peripheral surface of the second rod, and a guide groove extending from the tip edge portion to the engaging hole so as to guide the engaging protrusion. The rod connecting structure is provided with a notch for preventing rotation of the first rod, a rib for preventing rotation on the second rod, and the engaging protrusion of the first rod engaging with the engaging hole of the second rod. At the same time as stopping, when the non-rotating rib of the second rod and the non-rotating notch of the first rod can be engaged with each other at least in the circumferential direction, the non-rotating rib and the non-rotating notch are engaged. The at least one edge of the anti-rotation rib is set to collide with the opening edge of the anti-rotation notch. And it is obtained by the engageable without clearance with modified their abutment surfaces and / or scraping each other in the circumferential direction.

(Example 1)
FIG. 1 shows that a first rod 10 and a second rod 20 constituting a part of a handle of a cleaning tool are inserted into each other through a coupling tool 30 provided on the first rod 10, and are connected by male and female fitting. To do. In addition, the 2nd rod 20 comprises the front-end | tip part of a handle | pattern, and is provided with the cleaning head attaching part 20A.

  The first rod 10 is made of a pipe material, and as shown in FIG. 2A, the first rod 10 is provided with a peripheral wall on one end side of the pipe material penetrating the attachment hole 11 for the connector 30, and on the one end side of the pipe material. Non-rotating cutouts 12 are provided at a plurality of circumferential positions on the front end edge (in this embodiment, two positions spaced apart by 180 degrees, but a single position is also acceptable). The non-rotating notch 12 has a U-shape that opens outward in the axial direction.

  As shown in FIG. 2 (B), the connector 30 assembled to the first rod 10 has a generally straight shape (straight portion 30A) and is directed outward in the axial direction to a substantially half-circumferential portion on the base end side. It consists of a short cylinder material provided with the expansion part 31 expanded in a taper shape. The connector 30 is provided with an engagement protrusion 33 on the inner surface of the straight portion 30 </ b> A that is the inner periphery on the proximal end side and that faces the spread portion 31. The connector 30 includes a slit 34 that passes through the opposing portion of the engaging protrusion 33 in the circumferential direction of the straight portion 30A and extends over the entire length of the straight portion 30A. The connector 30 is assembled to the outer periphery on the one end side of the first rod 10 in a state where the engagement protrusion 33 is fitted in the attachment hole 11. The connector 30 is engaged with the outer periphery of the first rod 10 in a free state assembled to the first rod 10 by the elastic diameter reduction behavior of both side walls divided by the slits 34 with almost no gap. The protrusion 33 protrudes inward in the radial direction of the first rod 10 from the mounting hole 11, and the widened portion 31 is separated from the outer peripheral surface of the first rod 10 (FIG. 3).

  When the expanding portion 31 is drawn to the outer peripheral surface of the first rod 10 in the state of being assembled to the first rod 10, the connecting tool 30 holds both side walls sandwiching the slit 34 to the outer periphery of the first rod 10. It is elastically widened and deformed as it is, and the amount of protrusion of the engaging protrusion 33 from the mounting hole 11 inward in the radial direction of the first rod 10 is reduced. At the same time, the engaging protrusion 33 is moved from the mounting hole 11 to the first rod. The elastic force to be projected again inward in the radial direction of 10 is temporarily stored (FIG. 5). In other words, the first rod 10 is provided with the engagement protrusion 33 that is elastically urged inward in the radial direction on the inner peripheral surface of the first rod 10 in a state where the connector 30 is assembled.

  The second rod 20 is made of a pipe material, and, as shown in FIG. 2C, penetrates the engagement hole 21 into which the engagement protrusion 33 of the first rod 10 is fitted and locked into the peripheral wall on one end side of the pipe material. And a guide groove 22 extending from the tip edge portion to the engagement hole 21 so as to guide the engagement protrusion 33 is provided on the outer peripheral surface. The groove width of the guide groove 22 is set to a size that allows the lateral width of the engagement protrusion 33 (the width along the circumferential direction of the first rod 10) to be fitted without play. The guide groove 22 can gradually displace the engaging protrusion 33 outward in the radial direction during the insertion process of the first rod 10 and the second rod 20 (the expanding portion 31 is gradually formed on the outer peripheral surface of the first rod 10. A tapered groove bottom surface (FIG. 5).

  The second rod 20 has a plurality of circumferential positions on the outer peripheral surface (side away from the tip edge in the axial direction) from the engagement hole 21 on one end side of the pipe material (two positions spaced 180 degrees in this embodiment). However, a rib 23 for preventing rotation of the ridge is provided at a single position). The anti-rotation rib 23 has a U-shape that fits in the U-shaped anti-rotation notch 12 of the first rod 10 without a gap. As a result, the engagement protrusion 33 of the first rod 10 is fitted and locked in the engagement hole 21 of the second rod 20, and at the same time, the non-rotation notch 12 and the rotation prevention rib 23 of both the rods 10, 20 are both The rods 10 and 20 are set so as to be able to engage with each other in the axial direction and the circumferential direction.

  The anti-rotation rib 23 may have any shape that engages with the anti-rotation notch 12 at least in the circumferential direction. However, as shown in FIG. It can be arcuate, or the lateral width can be narrowed (tapered) toward the tip. Further, as shown in FIG. 7B, the rotation-preventing rib 23 can have a bottom surface wider than the top surface in a cross-sectional view.

  As the anti-rotation rib 23, the fitting surfaces of the both may or may not be in close contact as long as the fitting surfaces of the both are fitted at least in the circumferential direction with no gap. Further, the rotation-preventing rib 23 can be fitted with no gap in the circumferential direction even if there is a slight error in the processing accuracy of the fitting surfaces of both. Further, as the rotation preventing rib 23, the fitting surfaces of the two are rubbed together and scraped together or elastically deformed to fit together without any gap in the circumferential direction.

Therefore, the 1st rod 10 and the 2nd rod 20 are connected in the following procedures.
(1) Insert the first rod 10 to which the connector 30 is assembled into the second rod 20 (FIGS. 3 and 4). When the tip inclined surface 33A of the engaging protrusion 33 of the first rod 10 and the tip inclined surface 22A of the groove bottom of the guide groove 22 of the second rod 20 come into contact with each other (FIG. 4), the engaging protrusion 33 starts guiding to the guide groove 22. Then, the first rod 10 and the second rod 20 are aligned in the circumferential direction.

  (2) When the first rod 10 and the second rod 20 are pushed in the axial direction, the engagement protrusion 33 of the first rod 10 is gradually pushed up on the tapered groove bottom surface of the guide groove 22 of the second rod 20. Then, after accumulating the elastic force, it climbs over the groove bottom surface and elastically falls into the engagement hole 21 of the second rod 20 and is engaged and locked (FIGS. 5 and 6).

  (3) When the engaging protrusion 33 of the first rod 10 is elastically dropped into the engaging hole 21 of the second rod 20 in the above (2), the anti-rotation is provided in the axial direction of the rods 10 and 20. The notch 12 is abutted so as to collide with the rotation-preventing rib 23. As a result, the rib width of the rotation prevention rib 23 is set to be larger than the lateral width of the rotation prevention notch 12 (the width along the circumferential direction of the first rod 10), or the rotation prevention rib 23 and the rotation prevention notch 12 are set. Are set so that one side edge of the detent rib 23 collides with the opening edge of the detent notch 12 (two sets of detents on the first rod 10 and the second rod 20). When the notch 12 and the anti-rotation rib 23 are provided, the first rod 10 and the second rod 20 are shifted to either the left or right side in the axial direction, and one set of detents is provided to the first rod 10 and the second rod 20. When the notch 12 for rotation and the rib 23 for rotation prevention are provided, they are shifted largely from the gap between the engagement hole 21 and the engagement projection 33), and the notch 12 for rotation prevention and the rib 23 for rotation prevention have their abutting surfaces deformed to each other. Or sharpen And the like fit, mutually engage without a gap in the axial direction and the circumferential direction. When the anti-rotation notch 12 and the anti-rotation rib 23 are made of the same material, they are deformed, and when they are made of different materials, the hard material scrapes the soft material.

  (4) When the first rod 10 and the second rod 20 are separated, the expanding portion 31 of the connector 30 is pulled toward the outer peripheral surface of the first rod 10 by the operator's finger, and the engaging protrusion 33 is moved to the second rod 20. And the second rod 20 is pulled out. When the fingers are released, the connector 30 is re-attached to the first rod 10 due to the elastic diameter-reducing behavior.

According to the present embodiment, the following operational effects can be obtained.
(a) At the insertion end of the first rod 10 and the second rod 20, the engagement protrusion 33 of the first rod 10 is fitted and locked in the engagement hole 21 of the second rod 20, and at the same time both the rods 10, 20. The anti-rotation rib 23 and the anti-rotation notch 12 are engaged with each other in the circumferential direction of the rods 10 and 20. In other words, the anti-rotation rib 23 and the anti-rotation mechanism are in a retaining state where the rods 10 and 20 are pulled in the axial direction with each other due to the engaging force with which the engaging protrusion 33 is elastically engaged with the engaging hole 21. The notches 12 engage with each other without gaps in the axial direction and also with no gaps in the circumferential direction. Thereby, both the rods 10 and 20 will be connected without play in the axial direction and the circumferential direction.

  (b) During the insertion process of the first rod 10 and the second rod 20, the engaging protrusion 33 of the first rod 10 is gradually pushed up on the tapered groove bottom surface of the guide groove 22 of the second rod 20. After accumulating the elastic force, it is elastically fitted and locked into the engagement hole 21 of the second rod 20. As a result, the elastic locking force acting in the axial direction of the rods 10 and 20 makes the anti-rotation rib 23 and the anti-rotation notch 12 collide with each other. The anti-rotation rib 23 and the anti-rotation notch 12 are engaged with each other without any gap in the axial direction and the circumferential direction by deforming or scraping their abutting surfaces.

  (c) Since the anti-rotation rib 23 has an arcuate front end surface that engages with the anti-rotation notch 12 or a width that decreases toward the front end, the anti-rotation rib 23 and the anti-rotation rib The engagement of the notch 12 is made smooth.

FIG. 1 is a perspective view showing a rod coupling structure of the first embodiment. 2A and 2B show a rod and a connecting part, where FIG. 2A is a sectional view showing a first rod, FIG. 2B is a sectional view showing a connecting tool, and FIG. 2C is a sectional view showing a second rod. FIG. 3 shows a state before connection of the first rod and the second rod, (A) is a sectional view, and (B) is a plan view. 4A and 4B show an initial connection process of the first rod and the second rod, where FIG. 4A is a sectional view and FIG. 4B is a plan view. 5A and 5B show an intermediate process of connecting the first rod and the second rod, where FIG. 5A is a sectional view and FIG. 5B is a plan view. 6A and 6B show a connected state of the first rod and the second rod, where FIG. 6A is a sectional view and FIG. 6B is a plan view. FIG. 7 is a schematic view showing a modified example of the rotation prevention rib and the rotation prevention notch.

Explanation of symbols

10 First rod 12 Non-rotating notch 20 Second rod 21 Engaging hole 22 Guide groove 23 Anti-rotating rib 33 Engaging protrusion

Claims (4)

When connecting the first rod and the second rod by male-female connection,
While providing an engagement protrusion that is elastic in the radial direction of the first rod on the peripheral surface of the first rod,
An engagement hole for engaging and locking the engagement protrusion of the first rod is provided on the peripheral surface of the second rod, and a guide groove extending from the edge of the tip to the engagement hole is provided so as to guide the engagement protrusion. A rod connecting structure,
The first rod is provided with a non-rotating notch, the second rod is provided with a non-rotating rib, and the engaging projection of the first rod is fitted and locked in the engaging hole of the second rod, The locking rib and the rotation preventing notch of the first rod can be engaged with each other at least in the circumferential direction;
When engaging the non-rotating rib and the non-rotating notch,
Set so that at least one edge of the rotation prevention rib collides with the opening edge of the rotation prevention notch,
A connecting structure of rods that deforms and / or scrapes their abutting surfaces so that they can be engaged in the circumferential direction without gaps.   The rod connecting structure according to claim 1, wherein the guide groove has a tapered shape capable of gradually displacing the engaging protrusion in the radial direction during the insertion process of the first rod and the second rod. The bottom surface of the guide groove provided on the peripheral surface of the second rod has a tapered shape that gradually pushes the engagement protrusion of the first rod toward the engagement hole of the second rod,
The rod connection structure according to claim 1 or 2, wherein the abutment surface is deformed and / or scraped by causing the rotation-stop notch to collide with the rotation-stop rib by the elastic force pushed up and accumulated.   The rod connection structure according to any one of claims 1 to 3, wherein the rotation-preventing rib has an arcuate tip surface that engages with the rotation-stop notch, or a width that decreases toward the tip.

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