JPH1052388A - Extension tube and vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extension tube with, an improved manufacturing property, light weight, and reduced cost by reducing the number of part items. SOLUTION: In an extension tube 20, a cover body 36 to part a clamp chamber 39 at an outer circumferential part at one end of an outer tube 21, and part a connector chamber 38 at an outer circumferential part at the other end is installed on the outer tube 21 by a screw 41. A clamp 44 to hold a protruded condition of an inner tube 22 engaged and inserted into the outer tube 21 to freely advance/retract is disposed in the clamp chamber 39. A cylindrical removal stopping part 70 and a fixing part 71 are engaged and inserted into one end part of the outer tube 21 to hold a packing 72. A closed flange part 75 of the removal stopping part is applied to an end surface of the outer tube 21, and a tip of the screw 41 for installing the cover body 36 to cover the clamp 44 is engaged with the removal stopping part for composing a removal stopping means 73 to be fixed. A positioning protrusion to stop removal of the inner tube 22 is provided on an end part of the inner tube 22 to be applied to an end part of the removal stopping means 73. The cover body 36 and the removal stopping means 73 can thus be installed by the single screw 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extendable extension tube in which an inner tube is inserted into a tubular outer tube so as to be able to advance and retreat, and a vacuum cleaner.

[0002]

2. Description of the Related Art Conventionally, as an extension pipe which is detachably connected to a vacuum cleaner main body containing an electric blower through a hose and which detachably connects a suction port, a tubular inner pipe advances and retreats within a tubular outer pipe. Stretchable configurations that are fitted and inserted are known.

This extendable extension pipe has a plurality of recesses provided on the outer peripheral surface of the inner pipe along the direction in which the inner pipe advances and retreats, and an end of the outer pipe on the side on which the inner pipe advances and retreats. A clamp is provided for engaging and disengaging the concave portion of the inner tube, and a cover body is attached to the end of the outer tube by an attaching means such as a screw so as to cover the clamp. Also, in order to prevent the inner tube from falling off, a large-diameter engaging portion projecting from the outer peripheral surface of the end of the inner tube inserted into the outer tube is attached to the end of the outer tube on the side where the inner tube advances and retreats. The retaining part that comes into contact is attached.

[0004]

By the way, in the extendable extension tube, an engagement portion is provided on the inner tube and a retaining portion is provided to contact the engagement portion to prevent the inner tube from coming off.
It is necessary to prevent the workability from being complicated due to the falling off of the inner tube. And since the inner pipe is provided with a large-diameter engaging part that comes into contact with the retaining part as a retaining structure for the inner pipe, when attaching the retaining part to the end of the outer pipe, the retaining part first If the inner tube is attached to the outer tube, the inner tube cannot be inserted into the outer tube.Therefore, the stopper is fitted to the outer surface of the inner tube in advance, and after the inner tube is inserted into the outer tube, the stopper is Must be attached to outer tube.

Therefore, in the conventional extension pipe, a claw provided on the retaining portion is engaged with the inner peripheral surface of the outer tube, or the retaining portion is attached to the outer tube by a mounting means such as a screw. Also,
After attaching the inner tube to the outer tube, a clamp that holds the inner tube protruding from the outer tube is provided on the outer tube,
This clamp is covered with a cover body and attached with attachment means such as screws to form an extension tube.

For this reason, the extendable extension tube must be assembled and formed using a plurality of parts, and there is a problem that the assembly work is complicated and it is difficult to reduce the weight.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an extension pipe and a vacuum cleaner capable of improving the manufacturability, reducing the weight, and reducing the cost by reducing the number of parts. And

[0008]

According to a first aspect of the present invention, there is provided an extension pipe comprising: a substantially tubular outer pipe; a substantially tubular inner pipe inserted into the outer pipe so as to be able to advance and retreat substantially coaxially; Engaging means for engaging the inner pipe and holding the position of the inner pipe with respect to the outer pipe, a cover body for covering the engaging means, and an end of the outer pipe on the side where the inner pipe advances and retreats. And a mounting means for attaching the cover body and the locking means to the outer pipe.
A cover body that covers an engagement means that engages with the inner tube and holds the position of the inner tube with respect to the outer tube; In order to attach the retaining means for retaining the inner tube with the attaching means, the cover body and the retaining means are attached in common by the attaching means, thereby improving the assembly manufacturability by reducing the number of parts.
Weight reduction and cost reduction can be achieved.

According to a second aspect of the present invention, there is provided the extension pipe according to the first aspect, wherein the retaining means has a substantially cylindrical shape into which the inner pipe can be inserted, and is radially opposite to a position where the attaching means is attached. The outer tube is provided with a locking portion that can be engaged with and disengaged from the outer tube. Since the locking portion is provided so as to be able to be engaged with the outer tube, positioning of the locking device to the outer tube is easy, and assembling manufacturability is improved, and the locking device is securely attached to the outer tube.

According to a third aspect of the present invention, in the extension pipe according to the first or second aspect, the forward end of the inner tube is electrically connected to an end of the outer tube opposite to the side on which the inner tube advances or retracts. And a retaining means for holding the electric transmission means, the leading end of the inner pipe moving forward and backward, and the end of the outer pipe opposite to the side on which the inner pipe advances and retracts. The holding means for holding the electric transmission means for electrically connecting the parts is provided in the retaining means, so that the wiring of the electric transmission means is easy, the assembling manufacturability is improved, and the load due to the impact when the inner pipe is moved forward and backward is reduced. It is hard to catch on the electric transmission means held by and prevents damage to the electric transmission means.

A vacuum cleaner according to a fourth aspect includes the extension pipe according to any one of the first to third aspects and a vacuum cleaner main body to which the extension pipe is connected. 4. The extension pipe according to any one of claims 1 to 3, wherein the extension pipe is provided with improved assembly manufacturability, weight reduction and cost reduction, so that the extension pipe can be provided at a low cost and cleaning of the extension pipe during cleaning becomes easy. The performance is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vacuum cleaner having an extension pipe according to the present invention will be described below with reference to the drawings.

In FIG. 8, reference numeral 1 denotes a cleaner body, and the cleaner body 1 has a lower case 2a having an open upper surface;
Upper case 2b that closes the rear upper surface of this lower case 2a
Has a main body case 2 as a case body having a front upper surface portion opened by being sandwiched and joined to a peripheral edge including a front surface, and a lid for closing the opening of the front upper surface portion in the main body case 2 so as to be openable and closable. The body 4 is rotatably supported by a shaft.

The main body case 2 is provided with a non-illustrated swivel wheel on the front lower surface in the traveling direction, and large-diameter driven wheels 6 and 6 are rotatably provided on the rear side surface of the main body case 2. The cleaner body 1 can travel on the floor with the turning wheels and the driven wheels 6 and 6. Also, body case 2
A handle 7 slidable in the up-down direction is provided on the upper part.

Further, an electric blower (not shown) is disposed in the cleaner body 1 at the rear side, and an upper portion which communicates with the suction side of the electric blower and has a built-in dust collecting filter is open and has a lid. A dust collection chamber that is opened and closed at 4 is formed on the front side. A connection port 8 is formed at the front side of the cleaner body 1 so as to face the dust collection chamber. In the vicinity of the connection port 8 of the cleaner body 1, a connector portion (not shown) having a pair of electric contacts to which power is supplied is provided.

On the other hand, reference numeral 10 denotes a hose. The hose 10 is provided on a flexible hose main body 11 and one end of the hose main body 11, and is detachably inserted and connected to the connection port 8 of the cleaner main body 1. It comprises a connecting pipe 12 and a gripping pipe 13 provided at the other end of the hose body 11. The connection tube 12 is provided with a connector portion having a pair of pin terminals (not shown) that are detachably connected to the connector portion of the cleaner body 1. This connector is connected to the hose 10
And is electrically connected to an electric wire (not shown) built in the device. Further, this electric wire is connected to a terminal, which is a pair of electric contacts (not shown) provided at the distal end of the gripping tube 13, through an operating means 15 having a plurality of switches 14 and 14 provided on the gripping tube 13. It is electrically connected. In addition, grip tube 13
A clamp 16 is provided at the tip of the.

Reference numeral 18 denotes a suction port body. In the suction port body 18, a rotary cleaning body is rotatably supported facing a suction port (not shown) opened on the lower surface, and the rotary brush is rotated. A driving motor is provided. And
A connecting pipe 19 communicating with the suction port is provided at the rear of the suction port body 18.
The connecting tube 19 is provided with a connector portion having a pair of pin terminals (not shown) electrically connected to an electric motor.

On the other hand, 20 is a telescopic extension tube,
Reference numeral 20 denotes an approximately tubular outer tube 21 formed of an insulator such as a synthetic resin into a substantially cylindrical shape, and a substantially tubular inner tube 22 similarly formed of a synthetic resin into a substantially cylindrical shape. The inner tube 22 is capable of moving back and forth from the front side, which is one end side, into the outer tube 21, that is, is fitted slidably in the axial direction, and the outer tube 21 and the inner tube 22 are connected to be able to expand and contract.
The rear end of the outer tube 21 is detachably connected to the tip of the grip tube 13, and this connection is held by the clamp 16. Further, a front end, which is a forward end of the inner pipe 22 in the direction in which the inner pipe 22 moves forward and backward, is detachably connected to a distal end of the connection pipe 19 of the suction port body 18, and this connection is provided on the outer peripheral surface of the distal end of the inner pipe 22. Is held by the clamp 23.

In the vicinity of the tip of the inner tube of the extension tube 20,
A hook portion 26 having a hooking claw portion 25 which is detachably engaged with a concave hooking portion (not shown) provided at a rear portion of the cleaner body 1 is provided. The hook portion 26 has a grip tube 13
A hook 27 (not shown) provided on a side surface of the hook has a hook 27 to be engaged with and disengageable from the hook.

Next, the structure of the extension pipe 20 will be described in detail with reference to FIGS.

The grip tube 13 of the hose 10 is attached to one end of the outer tube 21.
A substantially tubular connecting tube portion 31 to be inserted into the shaft is integrally provided coaxially. The connecting pipe portion 31 is provided with a seal member 32 that is tightly attached to the inner peripheral surface of the gripping tube 13 on the outer periphery of the distal end portion to obtain airtightness, and the clamp 16 of the gripping tube 13 is detachably attached to the outer peripheral surface. An engaging hooking recess 33 is provided. Further, the inner peripheral surface of the end of the outer tube 21 opposite to the connecting tube portion 31 on the side where the inner tube 22 advances and retreats is formed slightly larger in diameter, and a positioning step 34 is formed.

Both ends of the outer tube 21 are formed on the outer peripheral surface of the outer tube 21.
A cover body 36 is attached along the axial direction over both ends of the cover body 36, and an outer tube wiring chamber 37 is defined and formed in the cover body 36. Further, a connector chamber 38 is provided at the base end of the connection pipe section 31 at the end of the outer pipe wiring chamber 37 on the side where the connection pipe section 31 protrudes, and a clamp is provided at the end on the side where the inner pipe 22 advances and retreats. A room 39 is provided. The cover body 36 has screw holes provided in the outer tube 21 located in the clamp chamber 39 and the connector chamber 38.
A screw 41 as an attachment means is screwed and attached to 40. In addition, a blindfold member 42 is detachably attached to the portion to which the screw 41 is attached with an adhesive or the like.

In the connector chamber 38, a pin terminal (not shown) which constitutes a pair of electric contacts, which is a pair of electric contacts, connected to the connector chamber 38 of the grip tube 13 is located above the base end of the connection pipe 31. And protrude coaxially.

In the clamp chamber 39, the outer tube 21 of the inner tube 22 is provided.
As an engagement means for maintaining the advance / retreat state with respect to
44 are arranged. The clamp 44 is provided in the clamp chamber 39
An operation unit 46 which is located above the window unit 45 and is provided so as to be able to advance and retreat toward a window 45 formed in the cover body 36.
With the operation described above, the protrusion engages with the outer peripheral surface of the inner tube 22 by freely protruding from the inner peripheral surface of the outer tube 21 through the insertion window 47 formed in the outer peripheral surface and communicating with the inner peripheral surface of the outer tube. A mating pin portion 48 is provided.

The operation section 46 is formed in a substantially box shape with an open lower surface, and a spherical operation concave portion 50 is provided on the upper surface. An engagement rib portion 51 that engages with the inner edge of the window portion 45 is formed on one edge of the lower surface of the operation portion 46 so as to protrude in a flange shape, and the opposite edge is circular so as to sandwich the engagement pin portion 48. Arc-shaped holding recess
An engagement piece 53 having 52 is projected. Further, a shaft portion 55 is provided on the lower surface side edge of the operation portion 46 so as to protrude in a substantially cylindrical shape toward the side.
A concave bearing portion provided on a rib 56 projecting in a wall shape inside
The shaft portion 55 is supported by the shaft 57, and when the operation concave portion 50 is pushed, the engagement piece 53 is rotated. In addition, on the inner surface side of the operation unit
A boss pin 62 for holding the other end of the operating urging means 61 such as a coil spring, one end of which is held by a boss 60 projecting from the outer peripheral surface of the 21, is provided. Then, the operation unit 46
By the urging of the operation urging means 61, the operation concave portion 50 always projects upward through the window 45.

The engaging pin portion 48 is disposed at the insertion window 47 provided in the outer tube 21, is formed in a substantially cylindrical shape with a bottom, and has a flange on the outer peripheral surface near the end on the opening side. An annular flange 64 projecting in a shape and abutting on the engagement piece 53 of the operation portion 46 is provided in a protruding manner. The engagement pin portion 48 is inserted into the rod-shaped guide portion 65 protruding downward on the lower surface of the cover body 36 on the inner peripheral side, and is inserted through the insertion window 47 along the radial direction of the outer tube 21. It is guided by the guide section 65 from the clamp chamber 39 so as to be movable forward and backward. Further, the engagement pin portion 48 includes an engagement urging means 66 such as a coil spring in which the guide portion 65 is inserted and one end of which is held at the base end of the guide portion 65. The distal end portion is interposed between the annular flange portions 64 of the portion 48 and always projects from the insertion window 47.

Further, at the end of the outer tube 21 on the side where the inner tube 22 advances and retreats, there is provided a retaining means 73 provided with a retaining portion 70, a fixing portion 71 and a packing 72 which is an airtight member. The retaining portion 70 is formed in a substantially cylindrical shape that can be inserted into the end of the outer tube 21 and the inner tube 22 can be inserted on the inner peripheral side, and has one end corresponding to the end of the outer tube 21. A flange-shaped closing flange 75 that comes into contact with and closes the end of the clamp chamber 39 is protrudingly provided.
Further, the retaining portion 70 has a notch formed in a crank shape along the axial direction on the opposite side to the portion that closes the clamp chamber 39 of the closing flange 75.
76 is notched. And the retaining portion 70 has a notch
By expanding the diameter of the retaining portion 70 so as to open the inner tube 76, the inner tube 22 can be inserted from the notch 76 on the inner peripheral side.

A pair of not-shown locking claws (not shown) are provided on the inner peripheral surface of the retaining portion 70 and project in a wall shape along the axial direction. Further, the outer tube 21 is provided on the outer peripheral surface of the retaining portion 70.
Groove-shaped holding portions for holding lead wires 78, 78 constituting electric transmission means respectively connected to pin terminals provided at one end of the
A pair of 79, 79 are formed substantially parallel along the radial direction.
An elastic tongue 80 having a free end is provided on the outer peripheral surface of the retaining portion 70 on the side opposite to the holding portions 79, 79.
An engagement projection 82 is provided at the end of the outer projection 21 to engage with an engagement hole 81 provided on the outer tube 21 on the side opposite to the insertion window 47 so as to be removably engaged. Further, the outer tube 21 is provided on the outer peripheral surface of the retaining portion 70.
An insertion hole 83 that guides the movement of the engagement pin portion 48 is formed in a substantially circular shape through which the engagement pin portion 48 can be inserted facing the insertion window 47.

The retaining portion 70 is provided on the outer peripheral surface of the cover body 36.
The cover body has an engagement concave portion 84 in which a screw 41 for attaching the screw is inserted into a screw hole 40 provided in the outer tube 21 and a distal end portion is engaged.
It is attached to the outer tube 21 with a screw 41 together with 36.

The fixing portion 71 is formed in an annular shape and has an annular packing 72 interposed between the retaining portion 70 and the positioning step 34 of the outer tube 21 to hermetically isolate the inside of the inner tube 22 from the outside air. It is arranged. Further, a pair of locking claws 86, 86 protruding in a wall shape along the axial direction like the retaining portion 70 are provided on the inner peripheral surface of the fixing portion 71. In addition, the fixing portion 71
A groove-shaped buffer groove 87 is provided on the outer peripheral surface along the circumferential direction, and the buffer groove 87 is formed in the outer peripheral surface in a groove shape in the axial direction corresponding to the holding portions 79, 79 of the retaining portion 70. Retaining part 70
The holding grooves 88 are connected to the holding portions 79. The outer peripheral surface of the packing 72 is also provided with holding groove-like portions 89, 89 which are formed in the axial direction and are notched in a groove shape corresponding to the holding groove portions 88, 88 provided in the fixing portion 71. Further, a cutout portion 90 is formed in the fixing portion 71 along the axial direction in the same manner as the retaining portion 70, and the diameter of the fixed portion 71 is increased so as to open the cutout portion 90 so that the inner circumferential side is formed. The inner tube 22 can be inserted from the cutout portion 90. A notch 92 having inclined surfaces 91, 91 is provided on an edge of the notch 90 opposite to the side sandwiching the packing 72 so as to expand in the axial direction.

On the other hand, the inner tube 22 has a flat portion 94 on the outer peripheral surface along the axial direction, and rib portions 95, 95 projecting in a wall shape along the axial direction are substantially parallel to the flat portion 94. A pair is provided. A lid 96 having a substantially arc-shaped cross section is attached to the ribs 95 and 95 so as to be substantially equivalent to the curvature of the inner peripheral surface of the outer tube 21, and an inner tube wiring chamber 97 is defined inside. ing. A gap having a wedge-shaped cross section is formed between the flat portion 94 and both sides of the lid portion 96, and the gap is formed by locking claws 86 provided on the inner peripheral surfaces of the retaining portion 70, the packing 72, and the fixing portion 71. The rails 99 are slidably engaged with the rails 86. The engagement between the locking claws 86, 86 and the rails 99, 99 prevents the retaining portion 70, the packing 72, and the fixed portion 71 from rotating.

The rails 99, 99 have an outer tube of the inner tube 22.
Positioning projections 100 which are located near the end on the side of insertion into 21 and continuously project on the outer peripheral surface of inner tube 22 and the outer surface of lid 96,
100 are provided. And the retaining part 70, packing 7
2 and the locking claw portions 86 provided on the inner peripheral surface of the fixed portion 71 contact the positioning protrusions 100 1
The retaining portion 70, the packing 72, and the fixing portion 71, which are integrally attached to the 21, are positioned, and the advancement of the inner tube 22 with respect to the outer tube 21 is restricted, so that the inner tube 22 is prevented from coming off.

Further, on the outer surface of the lid portion 96, a substantially circular concave locking concave portion 102 with which the engaging pin portion 48 of the clamp 44 provided on the outer tube 21 is removably engaged is substantially formed along the longitudinal direction. They are provided at equal intervals.

The outer peripheral surface of the distal end of the inner tube 22 which advances and retreats from the outer tube 21 is connected to the inner tube wiring chamber 97 so as to be connected to the clamp terminal chamber.
An end cover body 104 that defines and defines 103 is attached with screws 105 or the like. And this clamp terminal room 10
3 Inside the clamp, which engages with the outer peripheral surface of the connecting pipe 19 of the suction port body 18 inserted into the distal end of the inner pipe 22 to maintain the connection state
23, and a terminal to which a pin terminal of a connector portion provided in the connecting pipe 19 of the suction port body 18 is inserted and connected through a connection hole (not shown) opened on an end face of the clamp terminal chamber 103. Are arranged. Also, clamp terminal room 10
3 are connected to one ends of lead wires 78, 78 constituting an electric transmission means wired in the inner pipe wiring chamber 97 by soldering or the like. Note that the end of the end cover body 104 closes the clamp chamber 39 of the retaining portion 70.
The retraction of the inner tube 22 to the outer tube 21 is restricted by the closing flange portion 75 of the retaining portion 70 opposed to the outer tube 21 and integrally attached to the outer tube 21 abutting against the end surface of the end cover body 104. Is done.

Further, at the end of the inner tube 22 opposite to the side where the clamp terminal chamber 103 is provided, there is provided a circumferential groove-shaped wiring groove portion 107 which communicates with the inner tube wiring room 97, and is provided with a wiring. Groove
A substantially cylindrical cap body 108 that fits on the outer peripheral surface is provided so as to cover 107. Then, a pair of lead wires 78, 78 whose ends are connected to the terminals are connected to the inner pipe through an inner pipe wiring chamber 97.
22 is provided on the other end side. Note that the wiring groove 107
Also communicates with a groove-shaped gap between the flat portion 94 and the lid portion 96.

The inner tube 22 is provided on its outer peripheral surface with two coil wires 110, 110 which are located between the fixing portion 71 and the cap body 108 and constitute a coiled winding means. I have. The coil wire 110 is formed by coating an insulating member 112 having a small frictional resistance with respect to the outer tube and the inner tube around the copper wire 111. And these coil wires 11
One end of each of 0 and 110 is connected to a buffer groove 87 from a call-in portion 92 provided in a cutout portion 90 of the fixed portion 71 and is connected to a holding groove 8.
The lead wires 78, 88, which are located in the holding portions 79, 79 of the retaining portion 70 via the holding grooves of the packing 72 from the inside of the outer tube wiring room 37 via the holding grooves of the packing 72, and are routed to the inner peripheral side via the clamp chamber 39. 78 and solder, etc., and this connection part is the holding part 7 of the retaining part 70.
It is in the state of being held at 9, 79. The other ends of the coil wires 110, 110 are connected to the other ends of the lead wires 78, 78, which are wired in the inner tube wiring chamber 97 from the clamp terminal chamber 103 of the inner tube 22 to the wiring groove 107, by soldering or the like. , And this connection portion is located and held in the wiring groove 107.

Next, the operation of assembling the extension pipe of the above embodiment will be described.

The clamp 44 and the lead wires 78,
Inner tube 22 with clamp 78 and lid 96 attached and clamp
The outer tube 21 in which the wires 44 and the lead wires 78, 78 are wired is formed.
Then, the retaining means 73 is attached to the inner tube 22. That is,
The retaining portion 70 and the fixing portion 71 that constitute the retaining means 73 are formed by opening the notch portion 76 and the notch-shaped portion 90 to expand the diameter, and from the notch portion 76 and the notch-shaped portion 90 to the inner peripheral side of the retaining portion 70 and the fixing portion 71. Inner tube
22 is inserted, and the retaining portion 70 and the fixing portion 71 are fitted to the inner tube. The packing 72 constituting the retaining means 73 is an inner pipe.
From one end side of 22, the diameter is expanded against the elasticity and located between the retaining portion 70 and the fixing portion 71 and fitted to the inner tube 22. When attaching the retaining portion 70, the packing 72, and the fixing portion 71, the retaining claw portions 86, 86 provided on the rail portions 99, 99 of the inner tube 22 are provided. Is engaged.

Thereafter, the coil wires 110, 110 are wound around the outer peripheral surface of the inner tube 22, and both ends are connected to lead wires 78, 78 respectively wired to the outer tube 21 and the inner tube 22 by soldering or the like. The portions are held in the retaining portions 79, 79 of the retaining portion and the wiring grooves 107, 107 at the end of the inner tube 22, and a cap body 108 is attached to cover the wiring grooves 107, 107.

Next, the inner tube 22 is moved from the cap body 108 side to the outer tube.
21 from the clamp chamber 39 side,
Is inserted into the outer tube 21, that is, the fixing portion 71 is brought into contact with the positioning step 34 in the outer tube 21, and the closing flange 75 of the retaining portion 70 is brought into contact with the end surface of the outer tube 21. Note that this retaining portion 70
At the time of insertion, the engaging protrusion of the elastic tongue 80 provided on the stopper 70
The 82 is engaged with the engaging hole 81 provided in the outer tube 21. The engagement of the engagement protrusion 82 with the engagement hole 81 allows the insertion window 47 of the outer tube 21 and the insertion hole 83 of the stopper 70 to be engaged with the screw hole 40 of the outer tube 21 and the stopper 70. The recess 84 is aligned.

Then, the outer tube 21 is clamped in the clamp chamber 39.
The cover body 36 is fixed to the outer tube 21 with the screws 41 while arranging 44. At the time of fixing with the screw 41, the screw 41 attached to the clamp chamber 39 is inserted into the screw hole 40 of the outer tube 21, and the distal end portion engages with the engaging concave portion 84 of the retaining portion 70, so that the cover body is
36 is attached, and the retaining part 70 is also
The extension tube 20 is assembled by attaching the retaining member 73 to the outer tube 21.

Next, the operation of the above embodiment will be described.

At the time of cleaning, the cleaner body 1, the hose 10, the extension pipe 20, and the suction port 18 are connected to each other. In this state,
A pin terminal, which is an electrical contact of the connector of the connecting pipe 12 of the hose 10, contacts an electrical contact of a connector (not shown) of the cleaner body 1, and a rear end of the outer pipe 21 of the extension pipe 20 contacts an electrical contact of the gripping pipe 13. The terminal, which is the electric contact of the front end of the inner tube 22 of the extension tube 20, comes into contact with the pin terminal, which is the electric contact of the connecting tube 19 of the suction port body 18.

Then, the user holds the grip tube 13 and places the suction port body 18 on the floor surface to be cleaned.
The electric blower in the inside is driven to move the suction port body 18 on the floor. By driving the electric blower, dust sucked from the suction port of the suction port body 18 is transferred to the extension pipe 20 and the hose 10.
Through the dust collecting chamber of the cleaner body 1.

It should be noted that the height of the cleaning operator, the posture at the time of cleaning and the cleaning place, ie, for example, the suction port 18 for the floor surface is not used, and a suction port such as a furniture brush or a crane port is provided at the end of the extension pipe 20. Extend the extension tube 20 when connecting to clean high places such as the top of furniture or curtain rails, or when cleaning low places such as the floor, and when cleaning slightly higher places near the desk such as a desk. The length of the extension tube 20 is adjusted by appropriately expanding and contracting the extension tube 20 such as by contracting the extension tube 20.

The extension tube 20 expands and contracts by causing the operation concave portion 50 of the operation portion 46 of the clamp 44 provided on the outer tube 21 to move the operation concave portion 50 against the urging of the operation urging means 61. Operate to push it into 45. By operating the operation unit 46, the operation unit
46 rotates around the shaft portion 55, and the engaging pin portion 48 having the annular flange portion 64 with which the engaging piece portion 53 of the operating portion 46 abuts is integrally attached to the guide portion 65 and the outer tube 21. The extension tube 20 is moved outward along the radial direction while being guided by the insertion hole 83 of the retaining portion 70. Then, by movement of the engaging pin portion 48 engaging with the locking concave portion 102 provided on the lid portion 96 of the inner tube 22, the locking concave portion is moved.
The engagement pin 48 is disengaged from the outer tube 102 so that the inner tube 22 can slide with respect to the outer tube 21.

Thereafter, the inner tube 22 is slid with respect to the outer tube 21 so that the predetermined length is substantially equal to the predetermined length while pushing the operation portion 46, and the operation of the operation portion 46 is released. When the operation is released, the operation section 46 is rotated by the urging of the operation urging means 61 and the engagement urging means 66 so as to protrude outward from the window 45, and the engagement pin 48 is guided by the guide. Portion 65 and insertion hole
The guide pin 83 moves radially inward from the insertion hole 83 into the outer tube 21 along the radial direction, and the protruding distal end of the engaging pin portion 48 engages with the locking concave portion 102 again to move inside. The movement of the tube 22 is restricted, and the extension tube 20 is maintained at a substantially predetermined length. In addition,
If the distal end of the engaging pin 48 does not correspond to the locking recess 102, the inner tube 22 is advanced or retracted relative to the outer tube 21 with the operation of the operating portion 46 released. In this state, the urging of the operation urging means 61 and the engaging urging means 66 causes the engagement pin portion to move.
Since the distal end of the engaging pin 48 is in contact with the outer peripheral surface of the lid 96 so as to be pressed down, when the engaging concave portion 102 is located at the position of the distal end of the engaging pin 48, the engaging pin 48 The tip engages with the locking recess 102.

When the extension pipe 20 is contracted to the shortest state, the end of the end cover body 104 of the inner pipe 22 comes into contact with the end face of the closing flange 75 of the retaining portion 70 to restrict the movement. In this state, the engaging pin portion 48 is engaged with the locking concave portion 102.
When the extension pipe 20 is extended to the longest state, the positioning projections 100, 100 provided on the rail parts 99, 99 are locked by the fixing part 71 of the retaining means 73, which is integrally attached to the outer pipe 21. Claws
86, 86, the movement of the inner tube 22 is restricted, and the inner tube 22 does not fall out of the outer tube 21. In this state, the engaging pin portion 48 is engaged with the locking concave portion 102.

After cleaning, the cleaner body 1, the hose 10, the extension tube 20, and the suction port 18 are separated from each other and stored in an appropriate place. At this time, the extension tube 20 is contracted and stored in the shortest state. In this state, since the inner pipe 22 overlaps the inside of the outer pipe 21 and is housed in the outer pipe 21, the extension pipe 20 can be housed in a small space.

According to the above embodiment, the outer pipe 21 of the inner pipe 22 is engaged with the outer pipe 21 in which the inner pipe is inserted and retracted.
Cover body that covers the clamp 44 that keeps the projection against
Since the screw 36 and the retaining means 73 for preventing the inner tube 22 from coming off are attached with one screw 41, it is not necessary to use a plurality of members for attaching the cover body 36 and the retaining means 73, respectively, and the attachment is carried out with one member. Thus, the number of parts can be reduced, the assembling manufacturability can be improved, the weight can be reduced, and the cost can be reduced.

An engaging hole 81 formed in the outer tube 21 is provided on the outer side of the outer tube 21 at a position radially opposite to a position at which the inner tube 22 is fitted with the screw 41 of the retaining means 73 formed in a substantially cylindrical shape so that the inner tube 22 can be inserted. Since the engaging projection 82 of the elastic tongue 80 that can be disengaged is provided, the engaging recess 84 is engaged with the screw 41 for attaching to the outer tube 21 of the retaining means 73.
And the screw hole 40 of the outer tube 21 can be easily positioned, and assembling manufacturability can be improved, and the retaining means 73 is positioned and fixed in the radial direction by the screw 41 and the elastic tongue piece 80. Can be securely attached to the outer tube 21.

Further, lead wires 78, 78 and coil wires 110, which electrically connect the terminal at the distal end of the inner tube 22 and the pin terminals disposed in the connector chamber 38 of the outer tube 21, are provided to the retaining means 73.
Since the holding parts 79, 79 for holding the connection parts by soldering 110 are provided, the wiring of the lead wires 78, 78 and the coil wires 110, 110 can be easily performed, and the assembling manufacturability can be improved.
In particular, since the weak connection portions are held by the holding portions 79, 79, when the inner tube 22 advances and retreats with respect to the outer tube 21, loads such as tension, torsion, and impact of the expanding and contracting coil wires 110, 110 are applied. The connection portions are less likely to be caught, and damage to the weak connection portions between the lead wires 78, 78 and the coil wires 110, 110 constituting the transmission means can be particularly prevented.

Since the vacuum cleaner main body 1 is provided with the extension tube 20, which has a reduced number of parts, improves the assembly manufacturability, can reduce the weight, and reduces the cost, the vacuum cleaner can be provided at low cost and the weight of the extension tube 20 can be reduced. In the case of cleaning by the reduction, it is possible to easily perform the cleaning, and the cleaning workability can be improved.

Further, since the retaining means 73 for retaining the inner tube 22 with the retaining portion 70, the packing 72 and the fixing portion 71 is formed, the inner peripheral surface of the outer tube 21 and the inner tube 22 can be reliably connected with a simple configuration. Since the gap between the outer peripheral surface and the inner pipe 22 can be closed without any gap, and the inside of the inner tube 22 can be reliably airtightly isolated from the outside air, the suction efficiency can be improved,
Can be cleaned efficiently.

Further, since the call-in portion 92 is provided in the fixing portion 71 constituting the retaining means 73, the coil wires 110, 110 wound around the outer peripheral surface of the inner tube 22 constitute the electric transmission means and the holding portion of the retaining portion 70 is provided. 79, 79 can be easily wired.
Assembly in which the 22 is inserted into the outer tube 21 can be easily performed, and assembling workability can be improved.

Since the coil wires 110 are laid from the inlet 92 to the buffer groove 87 provided in the circumferential direction of the fixed portion 71, the coil wires 110, 110 correspond to the advance and retreat of the inner tube 22.
When the coil wires 110, 110 are connected to the lead wires 78, 78, the load is less likely to be applied to the coil wires 110, 110 wired to the holding portions 79, 79 in the axial direction from the buffer groove 87 in the circumferential direction even if the wire expands and contracts. Parts can be further protected.

On the other hand, as a clamp 44 for holding the projected state of the inner tube 22 with respect to the outer tube 21, an engagement piece 53 is provided at one edge of an operation portion 46 which is rotatable by a shaft portion 55. Since the engagement pin portion 48 having the annular flange portion 64 with which the piece-shaped portion 53 is engaged is provided so as to be movable in the radial direction of the extension tube 20, the engagement pin portion
The shape of the locking recesses 102, 102 provided in the inner tube 22 to which the 48 is disengaged is merely formed to be substantially the same as the shape of the tip of the engaging pin portion 48, and is simply integrated with the operating portion 46. The provided portion can be formed smaller than when it is engaged and disengaged by a rotation operation, that is, a large clearance is not required, and the engagement state between the engagement pin portion 48 and the locking concave portion 102 can be strengthened. For this reason, the engaging pin portion 48 and the locking concave portion 102 can be securely engaged with each other, and can be prevented from shrinking due to the load applied when the gripping tube 13 is pushed during cleaning, and the outer tube 21 can be reliably engaged with the outer tube 21. The projecting state of the inner tube 22 can be maintained. Further, even with the locking concave portion 102 having substantially the same shape as the shape of the distal end portion of the engaging pin portion 48, the engaging pin portion 48 does not easily come off from the locking concave portion 102, so that a smooth operation can be obtained and a simple operation can be obtained. With this configuration, it is difficult to apply force due to the fact that it is difficult for each part to come off, and damage can be prevented.

Further, the engaging pin 48 is provided with a guide 65
And it was configured to move by being guided by the insertion hole 83,
The engagement pin portion 48 can move smoothly, smooth operation can be obtained, and damage due to excessive force applied to each part can be prevented.

In the above embodiment, the retaining means
Although the retaining portion 70, the packing 72, and the fixing portion 71 have been described as 73, the packing 72 may be attached by, for example, integrally forming the retaining portion 70 and the fixing portion 71. According to this configuration, the number of components is reduced, and assembling workability is improved.

The retaining means 73 is not limited to a cylindrical shape, but may be any shape that engages with the inner tube 22, and the positioning projections 100 1 and 100 that come into contact with the retaining means 73 and prevent the removal may be any shape. it can.

The engagement means for holding the inner tube 22 in a protruding state with respect to the outer tube 21 is not limited to the clamp 44 but may be any structure.

Although the canister type vacuum cleaner has been described, the same effect can be obtained with any vacuum cleaner such as an upright type.

[0063]

According to the first aspect of the present invention, the outer pipe for inserting and retracting the inner pipe is provided with an engaging means for engaging the inner pipe to maintain the position of the inner pipe relative to the outer pipe. Since the cover body to be covered and the retaining means for retaining the inner tube are attached by the attaching means, the covering means and the retaining means can be attached in common by the attaching means, reducing the number of parts and improving the assembly manufacturability. It is possible to reduce the weight and cost.

According to the extension pipe of the second aspect, the first aspect.
In addition to the effects of the extension pipe described above, the inner pipe can be engaged and disengaged from the outer pipe by being positioned on the radially opposite side to the mounting means of the retaining means formed in a substantially cylindrical shape so that the inner pipe can be fitted and inserted. Since the locking portion is provided, the retaining means can be easily positioned when the retaining means is attached to the outer tube, the assembling manufacturability can be improved, and the retaining means can be securely attached to the outer tube.

According to the extension pipe of the third aspect, the first aspect is provided.
Or, in addition to the effect of the extension pipe described in 2, the holding section for holding the electric transmission means for electrically connecting the leading end portion of the inner pipe to the reciprocating end and the end of the outer pipe on the side opposite to the side on which the inner pipe retreats. Since the transmission means is provided in the retaining means, the electric transmission means can be easily wired, the assembling manufacturability can be improved, and the load caused by the impact at the time of moving the inner tube forward and backward is less likely to be applied to the electric transmission means, so that the electric transmission means can be prevented from being damaged.

According to the vacuum cleaner of the fourth aspect, since the number of parts is reduced, assembling manufacturability is improved, the weight is reduced, and the cost is reduced. In addition, it can be provided at low cost, and it is easy to handle the extension tube at the time of cleaning, and the cleaning workability can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side sectional view showing an embodiment of an extension pipe of the present invention.

FIG. 2 is a side sectional view, partially cut away, showing a state in which the clamp is operated.

FIG. 3 is a plan cross-sectional view of the extension tube with a part cut away.

FIG. 4 is an axial sectional view showing the inner tube.

FIG. 5 is an axial sectional view at a position where the retaining means of the inner tube is fitted.

FIG. 6 is a side sectional view showing the vicinity of a clamp chamber of the extension tube.

FIG. 7 is a side sectional view showing a state where the clamp is operated.

FIG. 8 is a perspective view showing an electric blower main body including the extension pipe of the present invention.

[Description of Signs] 1 Vacuum cleaner main body 20 Extension pipe 21 Outer pipe 22 Inner pipe 36 Cover body 41 Screw as attachment means 44 Clamp as engagement means 73 Detachment means 78 Lead wire constituting electric transmission means 79 Holder 80 Elastic tongue piece as stop 110 Coil wire constituting electric transmission means

Claims (4)

[Claims] 1. A substantially tubular outer tube, a substantially tubular inner tube substantially coaxially inserted and retractably inserted into the outer tube, and an inner tube provided on the outer tube and engaged with the inner tube. Engaging means for holding the position of the inner pipe relative to the outer pipe; a cover body covering the engaging means; and a stopper provided at an end of the outer pipe on the side where the inner pipe advances and retreats to prevent the inner pipe from coming off. And an attaching means for attaching the cover body and the retaining means to the outer pipe. 2. The retaining means has a substantially cylindrical shape into which an inner pipe can be fitted, and has a locking portion which can be engaged with and disengaged from the outer pipe on a radially opposite side to a position where the attaching means is attached. The extension pipe according to claim 1, wherein 3. An electric transmission means for electrically connecting a leading end portion of the inner tube to the reciprocating end and an end portion of the outer tube on a side opposite to the side on which the inner tube reciprocates, wherein the retaining means holds the electric transmission means. The extension tube according to claim 1 or 2, further comprising a holding portion that performs the operation. 4. An electric vacuum cleaner comprising: the extension pipe according to claim 1; and a cleaner main body to which the extension pipe is connected.