DE1245060B - Winding device for electrical cables on a vacuum cleaner - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

245 060 Int. Cl .:

A471

German class: 34 c -5/70

Number: 1 245 060

File number: A 316721 c / 34 c

Filing date: March 25, 1959

Opened on: July 20, 1967

The invention relates to a winding device for electrical cables on a vacuum cleaner, its one end of the housing through a cover with an axially inwardly extending air outlet stub can be closed, the air outlet nozzle counteracting the action of a spiral spring rotatable cable drum interspersed.

A winding device of the aforementioned type is already known in which an electrical cable with the help of a spiral spring is wound onto a rotating reel, which has a hollow, hub-like Has part through which the air passage of the vacuum cleaner extends, the spiral spring being concentric to the reel. With this type of arrangement, the cross-section of the air passage determines the Minimum diameter of this spring. This is undesirable because a coil spring with a central opening must be considerably longer for the air passage and a greater number of turns for Achieving the necessary torque required as a coil spring, which is tight around a shaft of proportionately small diameter is wound.

The object of the invention is to avoid this disadvantage and a winding device of the initially to train said type so that with the smallest possible spiral spring without expensive gear means a torque fully sufficient to rewind the cable while maintaining it a sufficiently large outflow cross-section for the blown air is ensured. According to the invention, this object is achieved by an eccentric to the cable drum in the Space between the air outlet nozzle and one extending in the axial direction of the housing Edge part of the cover arranged support member around which the spiral spring is wrapped, and through Means by which the torque of the spiral spring can be transmitted to the cable drum.

A first advantageous embodiment of the invention results from the fact that the support member through one rotatably mounted in the cover and non-rotatably connected to the inner ends of the spiral spring Pin is formed and that the means for transmitting the spring torque by two interlocking Gears are formed, one of which sits non-rotatably on the pin and the other on the end face of the cable drum remote from the vacuum cleaner housing and rotatably fixed with it is connected, the spiral spring from a fixed against the inside of the housing cover Enclosed capsule and is fixed with its outer end on the shell part of the capsule.

Take-up device for electrical cables
a vacuum cleaner

Applicant:

Aktiebolaget Electrolux, Stockholm

Representative:

Dipl.-Ing. E. Jourdan, patent attorney,

Frankfurt / M., Freiherr-vom-Stein-Str. 18th

Named as inventor:

Raymond Descarries, Montreal (Canada)

Claimed priority:

Canada April 1, 1958 (748 681)

Another advantageous embodiment of the invention is characterized in that the support member by a rotatably mounted on the cover and tight by a part of the spiral spring due to internal tension wrapped coil is formed and that the means for transmitting the spring torque by a arranged coaxially to the cable drum and connected to it in a rotationally fixed manner, with the first coil in a radial direction Direction aligned second coil are formed on which the outer end of the spiral spring is fixed and which is wrapped around by the following spring part in the same direction as the first-mentioned coil. The inner end of the spiral spring is expediently free in the circumferential direction relative to the former Movable coil.

According to a special feature of the invention, the front cover part is with the in the axial direction of the housing extending edge part of the cover and the air outlet nozzle in one piece formed, and the annular space enclosed by these parts is against the vacuum cleaner housing completed by a detachable partition with connecting elements, which are against both Place the edge part of the lid tightly against the air outlet nozzle.

The invention is described below with reference to two embodiments shown in the drawings explained in more detail. It shows

F i g. 1 shows the side view of a vacuum cleaner with a winding device according to the invention,

FIG. 2 shows the rear view of the vacuum cleaner according to FIG. 1,

709 617/79

F i g. 3 shows an enlarged longitudinal section through the rear end of the vacuum cleaner according to FIG. 1 and 2,

Fig. 4 is a longitudinal section of individual parts of the F i g. 3 to illustrate details,

F i g. 5 shows a cross section along line 5-5 in FIG. 1,

F i g. 6 is a transverse view, partly in an open representation and in section along line 6-6 in FIG. 3,

F i g. 7 shows a section along line 7-7 in FIG. 6,

F i g. 8 is a broken away partial view of the vacuum cleaner according to FIG. 1, 2 and 3 with opened Lid,

F i g. 9 shows a simplified transverse view of the last winding of the winding device completely from the cable reel removed cable,

FIG. 10 shows a longitudinal section corresponding to FIG. 3 by a further embodiment of the invention,

11 shows a cross section along line 11-11 in FIG. 10,

FIG. 12 shows a cross section along line 12-12 in FIG. 10 and

F i g. 13 shows a partial section along line 13-13 in FIG. 12.

The drawings show the invention in connection with a horizontal, mobile, cylindrical Vacuum cleaner 10, with a housing 11, a front cover 12 and a rear cover 14. The front cover 12, which is detachably attached in any way to the housing 11, has an inlet 13 to which a suction hose (not shown) can be connected. In the front end A dust bag 15 is attached to the vacuum cleaner, in which the dust is collected.

The air flow through the housing 11 is generated by a motor fan unit 16, which is essentially composed of a centrifugal fan 17 and an electric motor 18, the inside of the housing 11 is elastically attached. The fan 17 sucks the air through the dust bag 15, where it is essentially cleaned of dust and debris, and then blows it through the motor 18, a perforated transverse wall 19, a filter 20 and finally through an outlet opening 21 in the rear Cover 14 to the outside.

The rear cover 14, which is around the wheel axles of the rear wheels of the vacuum cleaner 10 for replacement of the filter 20 can be opened (cf. FIG. 8), has an outer, bowl-shaped, arched edge part 22, which merges in the middle into a sleeve-shaped part 23, which the air outlet of the Vacuum cleaner 10 forms and extends in the axial direction to the outlet opening 21. The through the The annular space formed by the cover 14 is sealed to the front by a detachable partition 24, in that these are fixed both against the edge part 22 of the cover 14 and against the air outlet nozzle 23 creates. The partition 24 engages below with lugs 25 in matching holes or Grooves in the cover 14, so that a hinge-like connection is made, and is above by means Screws 26 attached to the cover 14. The cover 14 and the partition wall 24 are in turn by means of a captive wing bolt 27 attached to the transverse wall 19 screwed to the housing 11. This bolt 27 is from behind by a in the air outlet nozzle 23 with radial ribs held Rohi-shaped part 28 out and is supported when tightening in a thread in the transverse wall 19 on an annular part 29 connected to the intermediate wall 24 via radial ribs. Of the Bolt 27 can be screwed tight by hand and does not obstruct any hoses or devices, which may be connected to the outlet opening 21 in order to use the blown air.

According to the present invention, a cable reel 30 is rotatable on the air outlet nozzle 23 attached and there through the partition wall 24 in

ίο Position held. As it F i g. 4 shows best the cable drum 30 consists of two assembled parts 31 and 32, the part 31 being made of any insulation material can be made if it is relatively hard. Each of the parts 31 and 32 forms a side wall of the cable drum 49 and also part of its hub, the Hub parts are held together by a hollow sleeve 33, the outwardly bent edges and held axially between a shoulder on the air outlet nozzle 23 and the partition wall 24 is (see Fig. 3).

An insulated electrical cable 34 is intended to be wound onto the cable drum 30 and has a normal plug 35 at its outer end by means of which it is connected to an electrical power source. In a side wall of the rear cover 14 is an opening 36 through which the cable 34 is passed, this opening being designed in size and shape so that the plug 35 is held at the opening and cannot slip through it when the Cable is released and wound onto the cable drum. The hub part of the insulated drum part 31 has a round groove 37 which receives the inner end part of the electric cable 34. As best shown in FIG. 9, this lies in the groove 37 in an arc of about 180 °, it being inserted through an opening 38 in the outer wall of the groove and the insulated line ends 34 a, 34 b of the cable 34 through a further opening 39 are led out of the cable drum 30 to the front in the drum part 31. Because of this arrangement, the part of the cable 34 lying in the groove 37 always remains firmly in this groove, even if the cable is completely unwound from the cable drum 30. If the cable is subjected to an extraordinarily strong pull, the full force of this pull cannot be transmitted to the line ends 34 a, 34 b , but is instead passed through the curved part of the cable 34, which thus serves to relieve the strain, in the groove 37 recorded.

The lines 34 a, 34 b to cause α 31 fixed slip rings 40 on the front side of the drum portion, ό 40 from which abrasive contacts 41 a, 41b pick up the current and forward them to the engine.

To wind the electrical cable 34 on the

Cable drum 30 is a spring motor 42 with a spiral spring 43, the spring being eccentric to Cable drum is arranged. The spiral spring 43 lies in a capsule 44, the shell part 45 of which with the rear cover 14 consists of one piece and is parallel to the air outlet nozzle 23 axially extends forward.

The inner end of the spring 43 is attached at 46 to a rotatable pin 47, which with one end in a blind hole 48 in the rear cover 14 and with its opposite end in the central one Bore of a cover plate 49 of the capsule 44 mounted

is. The cover plate is releasably fastened to the casing part 45 by screws 50. As best seen in Fig. 6, the latter is seen with an opening

51 , through which the bent-back outer end of the spring 43 extends and is hooked there.

A gear 52 is seated on the pin 47 outside the cover plate 49 and engages a second gear 53 which rotates with the cable drum 30 and forms a part with it (see FIG. 4). As in Fig. 6 and 7, the end of the pin 47 can be designed as a square in order to produce a non-rotatable connection with the gear 52 . According to FIG. 3, the gears 52 and 53 lie axially between the cable drum 30 and the front of the spring motor 42.

If the parts described so far in the FIG. 3, 5, 6 and 7, the cable 34 lies coiled on the cable drum 30 , and the plug 35 is held at the opening 36 in the rear cover 14 by the action of the spring 43 . As soon as the plug 35 is pulled out in order to pull the cable 34 from the cable drum 30, the tension of the spring 43 increases because the rotating movement of the cable drum is transmitted to the gears 52 and 53 and the pin 47. The cable drum 30 and the pin 47 therefore rotate together when the cable 34 is pulled off, while the spring 43 is tensioned at the same time. As soon as the plug 35 is released again, the cable drum 30 is rotated back by the spring 43, which is under considerable tension, this rotational movement from the spring 43 via the gears

52 and 53 is transferred to the cable drum. The released cable 34 is wound onto the cable drum 30 until the plug 35 rests on the rear cover 14 directly in the opening 36 through which the cable runs.

A locking mechanism is attached to lock the cable reel 30 as desired as soon as all or any part of the cable 34 has been unwound, that is to say the spring 43 is under tension. As FIG. 5 shows, this mechanism consists of a number of locking pawls 54 which are pivotably attached to the outer surface of the drum part 31 by means of pins 55 and which are carried along when the cable drum 30 rotates. The pawls 54, which are located just above, of the pawls 54, which are only effective on one side, endeavor to intervene in the one of several locking grooves 56 , which are also located just above, depending on the position of the vacuum cleaner, which are incorporated into the central axial extension of the partition wall 24 , which rests against the air outlet nozzle 23 (see Fig. 3). However, the upper pawl 54 can only engage in a latching groove 56 when the cable drum 30 rotates slowly backwards, since it is pressed outwards under centrifugal action when the cable drum 30 rotates rapidly. Since the operator slacks off the cable more or less quickly, it is up to him whether the return of the cable drum is stopped or not. After stopping, a short, jerky pull on the cable 34 and letting go is sufficient for the cable to continue winding. In order not to direct all of the force required for the backstop through the thin pins 55, a relatively large amount of play is provided between these and the pawls 54 and the contact of the pawl 54 itself against the upper boundary wall of the recess in the drum part 31 in which it is fastened ( see Fig. 3).

The further embodiment of the invention shown in FIGS. 10 to 13 differs from the first described essentially in that an electrical cable 134, when released, is wound onto a cable drum 130 with the aid of a modified spring motor 142 under constant tension. F i g. 10, FIG. 3 is similar to the embodiment described first, shows the accommodation of the cable drum 130 and the spring motor 142 in the rear cover 114. This in turn consists of an outer edge part 122 and a sleeve-shaped part 123 forming the air outlet nozzle, the annular chamber formed between the two forward through a Partition 124 is completed. The fastening of the partition 124 to the cover 114 is carried out in the same way as in the first embodiment. The attachment of the cover 114 to the vacuum cleaner housing is also the same.

In contrast to the cable drum 30 described above, the cable drum 130 is made in one piece. The slip rings 140 a, 140 b are attached to a special insulating part 131 which is firmly connected to the cable drum 30 and in which the groove 137 corresponding to the round groove 37 is also incorporated. The current consumption is the same as described above. In a further deviation from the first embodiment, a coil 153 is provided at the rear end of the cable drum 130 - preferably formed in one piece with it - instead of a gear 53. Like F i g. 10 shows, the cable reel 130 is mounted on the air outlet connection 123 by means of bushes 157 a and 1576 provided with a rim, the intermediate wall 124 serving to hold these parts in their axial position. A flange 158 at the rear end of the coil 153 carries a number of pawls 154, the mode of operation of which corresponds to that of the pawls 54 described above, but which engage in locking grooves on the outer surface of the air outlet connector 123 .

Parallel to the air outlet connection 123 , within the annular space formed in the cover 114 , a hollow projection 159 provided with an internal thread is formed in one piece with the cover and receives a bolt 147 on which a spool 152 rotates. A spring 143 with constant tension is spirally wound around the coil 152 , the outer end of which protrudes and is fastened at 160 on the coil 153.

As soon as the cable drum 130 is rotated to unwind the cable 134 , the spring 143 is also gradually transferred from the reel 152 to the reel 153 . In doing so, the spring first moves on a substantially straight path to point 161 and then bends backwards around the spool 153 . The spring 143 is pretensioned in such a way that the parts already wound onto the spool 153 do not suffer a change in their tension, while the part of the spring 143 located on the spool 152 is essentially without tension. Each case only that part of the spring 143, which just is in transition from one reel to the other, is subject to a voltage change, it therefore successive longitudinal portions of the spring are clamped 143 during winding and unwinding in succession without stresses accumulate, and when the spring with

approximately the same radius of curvature was produced over its entire length, the tensioning force generated by the spring motor 142 is essentially constant from the beginning to the end of a winding or unwinding process and is composed of the part of the spring 143 located between the coils on the periphery of the Coil 152 exerted tension and the further tension that arises when the straight spring part between the coils is bent into the curvature of the coil 153 .

As soon as the cable 134 is pulled in order to unwind it from the cable drum 130 , the spool 153 rotates with it and the winding of the spring 143 onto the spool 153 begins, the spring being continuously tensioned in sections. As soon as the cable 134 is released, the spring 143 is transferred back from the reel 153 to the reel 152 , the tensioning force developed by the spring likewise remaining essentially constant during the entire process of winding the cable 134 onto the cable drum 130.

As can be seen, the diameter of the spool 152 is smaller than that of the spool 153. While the outer end of the spring 143 is attached at 160 to the larger spool 153 , on the other hand, the spring need not also be attached to the spool 152 , which is preferably made of should consist of a suitable plastic material and rotate freely on the extension 159.

Both described embodiments have in common, as can be seen from the above, a very compact design, a relatively light weight and the advantage of simple assembly.

35

Claims (5)

Patent claims: 1. Winding device for electrical cables on a vacuum cleaner, one end of the housing of which can be closed by a cover with an axially inwardly extending air outlet nozzle, the air outlet nozzle passing through a cable drum rotatable against the action of a spiral spring, characterized by an eccentric to the cable drum (30, 130 ) in the space between the air outlet stub (23, 123) and an edge part of the cover (14, 114) extending in the axial direction of the housing, around which the spiral spring (43, 143) is wrapped, and by means through which the Torque of the spiral spring can be transmitted to the cable drum (30, 130) . 2. Winding device according to claim 1, characterized in that the support member is formed by a in the cover (14) rotatably mounted and with the inner ends of the spiral spring (43) non-rotatably connected pin (47) and that the means for transmitting the spring torque by two Interlocking gears (52, 53) are formed, one of which (52) sits non-rotatably on the pin (47) and the other (53) is arranged on the end of the cable drum (30) remote from the vacuum cleaner housing (11) and rotates with it is connected, the spiral spring (43) being enclosed by a capsule (44) fixed against the inside of the housing cover (14) and fixed with its outer end on the casing part (45) of the capsule (44). 3. Winding device according to claim 1, characterized in that the support member is formed by a on the cover (114) rotatably mounted and from a part of the spiral spring (143) tightly wrapped by internal tension coil (152) and that the means for transmitting the spring torque through a second coil (153), which is arranged coaxially to the cable drum (130) and connected to it in a rotationally fixed manner and is aligned with the first coil (152) in the radial direction, on which the outer end of the spiral spring (143) is fixed and which of the following one The spring part is wrapped in the same direction as the first-mentioned coil (152) . 4. Take-up device according to claim 3, characterized in that the inner end of the spiral spring (143) is freely movable in the circumferential direction relative to the first-mentioned coil (152). 5. Winding device according to one or more of the preceding claims, characterized in that the front cover part is integrally formed with the edge part (22, 122) of the cover (14, 114) and the air outlet nozzle (23, 123) extending in the axial direction of the housing and the annular space enclosed by these parts is closed off against the vacuum cleaner housing (11) by a detachable intermediate wall (24, 124) with connecting elements which extend both against the edge part (22, 122) of the cover (14, 114) and against the air outlet nozzle Apply (23, 123) tightly. Considered publications: German Patent No. 880,475;
U.S. Patent No. 2,323,275. For this purpose 2 sheets of drawings 709 617/79 7. 67 © Bundesdruckerei Berlin