JP3656786B2 - Extension tube of vacuum cleaner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an invention of an extension tube of a vacuum cleaner, and more particularly to an extension tube of an electric vacuum cleaner with improved lengthening feeling of the extension tube that enables length adjustment.
[0002]
[Prior art]
Conventionally, as a vacuum cleaner, a hose is detachably connected to a vacuum cleaner main body including a suction drive source for sucking air and a dust collecting bag, and the amount of rotation of a suction motor, etc. on the free end side of this hose It is known to provide a hand operating part for selecting and operating, and to provide a suction port body on the hand operating part via an extension tube.
[0003]
Recently, an extension pipe in which the rear end portion of the first extension pipe on the suction port side is held in the second extension pipe on the hand operating portion side so as to be able to be adjusted in and out has come to be marketed.
[0004]
Such a telescopic extension pipe is configured such that the end of the first extension pipe on the second extension pipe side is inserted into the end of the second extension pipe. A plurality of locking recesses for adjusting the length are formed in a row on the outer peripheral surface of the first extension tube, and a locking button that enters and exits the locking recess on the inner peripheral surface of the second extension tube can swing. Is provided.
[0005]
A seal ring is disposed on the inner wall surface of the second extension pipe, and air enters from the gap between the outer peripheral surface of the first extension pipe and the inner peripheral surface of the second extension pipe by the seal ring. The negative pressure is prevented from weakening.
[0006]
[Problems to be solved by the invention]
However, in the prior art, there is a problem that there is a concern that the backlash between the first extension pipe and the second extension pipe is greatly increased when the first extension pipe protrudes greatly from the second extension pipe for the following reason.
[0007]
First, in a state where the first extension pipe protrudes greatly from the second extension pipe, the length of overlap between the outer peripheral surface of the first extension pipe and the inner peripheral surface of the second extension pipe is short, and rattling is increased. Is.
[0008]
Secondly, when the second extension pipe is formed, a draft is formed, and the inner peripheral surface of the second extension pipe becomes larger in diameter on the first extension pipe side. Accordingly, the end of the first extension pipe is at a position where the inner diameter of the second extension pipe is small when the amount of protrusion of the first extension pipe from the second extension pipe is small. The end of the extension tube is at a position where the inner diameter of the second extension tube is large.
[0009]
For this reason, in the state where the first extension pipe is protruded greatly from the second extension pipe, the gap between the two becomes large, and the backlash is also increased.
[0010]
If the draft angle of the second extension pipe is reversed, it is difficult to insert the first extension pipe into the second extension pipe when assembling.
[0011]
The present invention has been made paying attention to such a problem. In the extension pipe of the vacuum cleaner in which the first extension pipe and the second extension pipe are connected so as to be adjustable in length, the first extension pipe and the second extension pipe are provided. (2) An object is to provide an extension tube of a vacuum cleaner that prevents the extension tube from coming off.
[0012]
[Means for Solving the Problems]
In order to solve the above problem, the extension pipe of the vacuum cleaner according to claim 1 of the present application includes a first extension pipe connected to the suction port body and a second extension pipe connected to the cleaner body side, The first extension pipe is configured to be inserted and connected into the second extension pipe, the outer diameter of the first extension pipe is equal in the longitudinal direction, and the first extension pipe is connected to the suction pipe. thickness of toward the cleaner body from the mouth side is formed to consist of a thick walled, engagement recess is arranged in the longitudinal direction on the outer peripheral surface is formed with a plurality of the first extension pipe, wherein the 2 The extension tube is formed with a locking projection hooked on one of the locking recesses, and the second extension is formed by selectively locking the locking projection with the locking recess. the protruding length of the first extension pipe from the pipe an extension tube of the variable and the vacuum cleaner, the plurality shaped In accordance with the change in the thickness of the first extension tube, the depth of the locking recess is deep at the front end when the first extension tube is inserted, and the locking recess at the rear end It is characterized by being formed so as to become shallower as it goes.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an extension pipe of a vacuum cleaner according to a preferred embodiment of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 shows a connection state of a connection pipe and a second extension pipe of a first extension pipe of a vacuum cleaner according to an embodiment of the present invention.
[0015]
In FIG. 1, 1 is a first extension pipe having a connection pipe portion 3, 2 is a second extension pipe, 4 A to 4 F are locking recesses formed in the connection pipe section 3, and 5 is a lock of the second extension pipe 2. It is a convex part.
[0016]
The first extension pipe 1 has a cylindrical cross-sectional shape extending to the right side in FIG. 1, and a suction port (not shown) is connected to the left end of the first extension pipe 1. A locking portion 6 is attached to the left end of the first extension tube 1, and the suction port body can be extracted from the first extension tube 1 by pressing a button 7 of the locking portion 6.
[0017]
As shown in FIG. 3, the connecting pipe part 3 is formed with the same diameter on the outer peripheral surface, and the left end part 3B on the suction port side is thin due to the draft of the die at the time of molding. Yes, the right end 3A on the second extension tube 2 side is formed thick.
[0018]
Locking recesses 4 </ b> A, 4 </ b> B, 4 </ b> C, 4 </ b> D, 4 </ b> E, and 4 </ b> F are arranged side by side in the longitudinal direction of the connection pipe part 3 on the outer peripheral surface of the connection pipe part 3. The locking recess 4A is the shallowest, and is formed such that the depth gradually increases in accordance with the thickness of the draft as it goes to 4B, 4C, 4D, 4E, and 4F. As the overlapping portion when the first extension pipe 1 is inserted becomes shorter, the difficulty of pulling out the locking convex portion 5 and the locking concave portions 4A to 4F increases. In the vicinity of the left end of the connecting pipe portion 3, a hook portion 9 that is inserted into the locking hole of the vacuum cleaner main body is protruded, and the wall portion in the vicinity of the hook portion 9 is formed thick so that the strength is improved.
[0019]
A hose connected to the cleaner main body is detachably connected to a right end (not shown) of the second extension pipe 2. At the rear end portion of the second extension tube 2, the distal end portion 3 </ b> A of the connection tube portion 3 is inserted. A holding cylinder 10 that holds the distal end portion 3 </ b> A of the connection tube portion 3 is fixed to the inner surface of the rear end portion of the first extension tube 1.
[0020]
A locking portion 11 that holds the cylindrical locking projection 5 is attached to the left end of the second extension pipe 2. The locking part 11 includes a detachable button 12 that raises the locking projection 5. The detachable button 12 is mounted on the base 13 of the locking portion 11, and a pair of convex portions 14 serving as fulcrums are projected from the lower edge portion close to the locking convex portion 5. Further, in the vicinity of the locking projection 12 of the detachable button 12, a locking piece 15 for raising the flange 5A of the locking projection 5 is projected. Between the convex portion 12A on the inner surface of the ceiling portion of the detachable button 12 and the convex portion 13A of the base 13, a spring 16 that elastically biases the rear portion of the detachable button 12 is compressed and disposed. Is held by the pair of convex portions 14 and the edge 18 of the opening of the cover 17.
[0021]
A spring 19 is provided between the flange 5A and the inner surface of the ceiling portion of the cover 17 at the upper end of the locking projection 5 to elastically bias the locking projection 5 downward. The base 13 and the holding cylinder 10 below the locking projection 5 are formed with openings through which the locking projection 12 can be inserted and retracted. The base 13 and the holding cylinder 10 are integrally fastened to the rear end portion of the cover 17 by screws 20, and the front end portion of the cover 17 is inserted into the groove 21 of the mounting opening portion of the first extension pipe 1. Reference numeral 22 denotes a seal ring, reference numeral 23 denotes a screw opening, and reference numeral 24 denotes a protrusion for supporting the base 13 for receiving a force applied from the detachable button 12.
[0022]
According to the extension pipe of the vacuum cleaner of this embodiment, when the connection pipe portion 3 is extended from the second extension pipe 2, the engagement of the second extension pipe 2 to the locking recesses 4 </ b> A and 4 </ b> B of the connection pipe portion 3 is achieved. The retaining protrusion 5 is shallowly locked. At this time, since the region where the connecting pipe part 3 is held on the inner surface of the first extension pipe 1 is long and the backlash is small, the locking convex part 5 does not come off the locking concave part 4A or 4B.
[0023]
On the other hand, when the connection pipe part 3 is extended from the second extension pipe 2 for a long time, the region where the connection pipe part 3 is held on the inner surface of the second extension pipe 2 is short, and the rattling is increased. However, since the locking projection 5 of the second extension pipe 2 is deeply locked in the locking recesses 4E and 4F of the connecting pipe portion 3, the locking projection 5 does not come off from the locking recesses 4E and 4F. .
[0024]
If a large number of locking recesses 4A to 4F formed on the outer peripheral surface of the connecting pipe part 3 are formed, the first extension pipe 1 is adjusted in multiple stages, and the second extension pipe 2 is connected to the connecting pipe part. As the length of the region holding 3 becomes shorter, the depth when the locking projection 5 enters the locking recesses 4A to 4F becomes deeper, so that the first extension pipe 1 is prevented from coming off. Moreover, the thickness of the connecting pipe portion 3 can be formed so that the second extension pipe 2 side is thick and the suction port side is thin due to the draft, and the depth of the locking recesses 4A to 4F is changed. In addition, the rigidity of the connecting pipe portion 3 can be ensured.
[0025]
【The invention's effect】
According to the extension pipe of the vacuum cleaner of claim 1 of the present invention, when the first extension pipe is extended short from the second extension pipe, the locking projection of the second extension pipe is formed in the locking recess of the first extension pipe. Even if it is locked shallowly, the area where the first extension pipe is held on the inner surface of the second extension pipe is long and the backlash is small, so that the locking projection does not come off the locking recess. When the first extension pipe is extended longer than the second extension pipe, the area in which the connecting pipe portion is held on the inner surface of the second extension pipe is shortened, but the engagement of the second extension pipe with the locking recess of the first extension pipe is shortened. Since the locking projection is locked deeply, the locking projection does not come off the locking recess.
[Brief description of the drawings]
1 is a cross-sectional view of a connecting portion of an extension pipe of a vacuum cleaner according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a connection state of a first extension pipe, a connecting pipe portion, and a second extension pipe of FIG. Fig. 3 is a cross-sectional view of a state in which the locking projection is pulled out of the locking recess by pressing the detachable button. Fig. 3 is a cross-sectional view of the connecting pipe portion of the first extension pipe in Fig. 1
DESCRIPTION OF SYMBOLS 1 1st extension pipe 2 2nd extension pipe 3 Connection pipe part 4A-4F Locking recessed part 5 Locking convex part

Claims (1)

The first extension pipe connected to the suction port body and the second extension pipe connected to the cleaner body side are configured to be inserted and connected to the first extension pipe into the second extension pipe, The diameter of the outer peripheral surface of the first extension pipe is formed to be equal in the longitudinal direction, and the first extension pipe is formed so that the thickness from the suction port body side to the cleaner body side changes from thick to thin. the the first extension pipe engagement recess arranged in the longitudinal direction on the outer peripheral surface formed with a plurality, wherein the second extension pipe, the engaging projections to be hooked to one of the locking recess An extension tube of an electric vacuum cleaner formed, wherein the locking projection is selectively locked to the locking recess, so that the protruding length of the first extension tube is variable from the second extension tube. the depth of the plurality formed locking recess, in accordance with the change in the thickness of the first extension pipe, wherein the Locking recess of the insert at the distal end of the extension tube is deep, the extension pipe of the vacuum cleaner, characterized in that it is formed so as to be successively shallower with increasing the engagement recess of the rear end portion.

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