EP0192943B1

EP0192943B1 - Spring retainer for vacuum cleaner nozzle brush

Info

Publication number: EP0192943B1
Application number: EP86100534A
Authority: EP
Inventors: Robert C. Berfield
Original assignee: Shop Vac Corp
Current assignee: Shop Vac Corp
Priority date: 1985-02-25
Filing date: 1986-01-17
Publication date: 1988-12-28
Also published as: EP0192943A1; ATE39409T1; DE3661499D1

Abstract

A nozzle (10) for a vacuum suction cleaner (14) has a suction inlet (24) on its bottom surface, and behind the inlet, the nozzle has a brush receiving chamber (30). The brush (50) comprises a support bar (52) in the brush chamber (20) and the support bar supports depending bristles (54). A respective combined spring and retainer (60) at both lateral ends of the brush chamber presses against the bristle support bar and urges the brush out of the housing (20). A retainer (70) which is integral with each spring (62) is clipped to each of two projections (40) at the lateral ends of the brush chamber and that retainer (70) is removable from its projection to facilitate removal of the brush from the brush chamber.

Description

Background of the invention

The present invention relates to the nozzle on the hose of a vacuum cleaner, and particularly to the brush on that nozzle and more particularly to a spring retainer for that brush.
Vacuum cleaners typically have an intake suction hose to which a nozzle is attached. The nozzle includes a housing with an intake or suction inlet opening at its bottom side. A brush may be supported in the nozzle housing to the rear of the inlet and the brush moves dirt to the inlet passageway. A brush having bristles which project out of the bottom of the nozzle housing to an extent adequate for brushing a flat floor may project out too farwhen the same nozzle is moved over a carpet, and bristtes that are the correct length for a carpet may be too short to brush a floor. In practice, the original nozzle may be replaced when the texture of the surface changes . significantly, or a floor brush may be removed to permit use of the same nozzle on a carpeted surface. It is also known to retract a brush in a nozzle by various retraction mechanisms. The retraction mechanisms often include various complicated linkages, swivels for the brush, etc.
It is also known to mold brushes for vacuum cleaner nozzles from plastic material, wherein the brush bristles are integrally molded on a support and the support is held in the vacuum cleaner housing. It is desirable for the brush to be able to "float" in the housing, so that the degree of extension of the bristles will automatically adjust depending upon the nature of the surface over which the nozzle is moved. Various spring arrangements for the brush of the nozzle of an electric vacuum cleaner are known. See, for example, U.S. Patents 2,972,771, 3,329,989 and 2,570,759. Again, known spring arrangements are typically complex and the nozzle includes an excessive number of parts.
US-PS 2 570 759 shows a nozzle according to the preamble of claim 1, comprising amongst other components a spring supported brush, the brush comprising a supporting element and brushing means, the whole device further comprising a retaining means for preventing-that the brush is forced out of the housing. With this structure, the brush retaining means is of complicated design as well as of poor reliability in performance.
US-PS 2 972 771 shows a structure which permits the brush to move into the housing and to be urged out of the housing to a predetermined extent. However, there are two different parts for the two functions, i.e. for retaining the brush supporting element on the one hand, and for biasing the brush out of the bottom side of the housing, on the other hand. Therefore, also this structure is complicated with regard to both, manufacture and assembling.
It is the object of the invention to provide a nozzle for a vacuum cleaner as per the preamble of claim 1 which is simple in design, has a minimum of parts, is easy to manufacture and to assemble and is relaible in its operation.
This object is achieved by the characterizing features of claim 1.

Brief description of the drawings

Fig. 1 is a view of an electric vacuum cleaner in which the invention is incorporated;
Fig. 2 is a front view of a nozzle provided with the invention and partially broken away;
Fig. 3 is a side cross-sectional view of the nozzle along the line of arrows 3;
Fig. 4 is an enlarged fragmentary view of the nozzle showing the spring and the retainer for the spring;
Fig. 5 is a perspective view of the combined spring and retainer;
Fig. 6 is a front view of the brush for use in the nozzle; and
Fig. 7 is an end view of the brush.

Detailed description of the invention

Referring to Fig. 1, a vacuum cleaner nozzle 10 is provided with a brush 50 that is held by the spring and retainer 60 according to the present invention. The nozzle is attached to a hose 12 which is in turn attached to the air inlet 13 to a conventional canister type electric vacuum cleaner 14. The vacuum cleaner has a material collecting tank 16 and an air outlet, as is conventional.
The nozzle 10 comprises a housing 20 with an outlet fitting 22 that is connected to the hose 12. As is conventional, the housing 20 is narrow front to back and is quite wide from side to side, as can be seen in Figs. 2 and 3. The outlet fitting 22 communicates into a suction inlet 24 of the housing which opens beneath the housing 20. The suction inlet is wide between the lateral sides of the housing and short from front to back. To the front of the inlet opening 24, there is a front, ground riding surface 26. At the rear of the housing there is a rear, ground riding surface 28. The surfaces 26 and 28 orient the inlet opening for suction.
It is conventional to dispose a brush to the rear of a nozzle inlet so that as the vacuum cleaner is moved forward, the bristles of the brush push dirt toward the inlet. The molded housing 20 has a cavity 30 molded into it to the rear of the inlet opening 24 for receiving the brush, as described below. The cavity 30 is open at the bottom. The upper wall 32 of the housing at the cavity 30 defines the upper wall of the brush cavity. The height of the upper wall 32 is great enough with respect to the height of the brush 50 that there is sufficient. space for the brush to shift into the cavity as the brush is moved over different surfaces, as described further below. The upper wall 32 in the brush cavity further includes a short molded projection 33 which extends to engage the retainer 70, as described below. The nozzle housing 20 includes a cavity defining front wall 34_' and rear wall 36 which are spaced apart the front to back width of the brush support bar 52, described below, which prevents the brush 50 from shifting forwardly and rearwardly in the housing 20 as the nozzle is moved back and forth in normal use.
Toward the opposite lateral ends of the cavity 30, respective brush carriers in the form of spring retaining projections 40 are molded to and project down from the top wall 32. The projection 40 has a flat laterally outwardly facing surface 42 over which the leg 78 of the spring retainer 70 can slide as the brush 50 moves into and out of the housing. The inwardly facing side 44 of the projection 40 includes a short shelf 46 defined on it which helps retain the spring in the cavity 30, as further described below. The bottom end 48 of the projection 40 does not extend down to the bottom of the housing 20, and thereby leaves sufficient space in the cavity beneath the bottom 48 of the projection for the brush retainer to be inside the housing.
The brush 50 comprises a rigid supporting bar 52 of molded plastic from the bottom of which project a plurality of integrally molded bristles 54. The bristles 54 are flexible enough to brush dirt towarde housing suction inlet 24 and are stiff enough that as pressure is applied to the bristles from below, the bristles transmit the force to the bar 52 and shift it into the cavity 30 and against the bias of the spring 62. The bar 52 is of relatively short height, providing a large clearance space in the cavity 30 above the bar 52 for the spring 62. The bar 52 includes end portions 56 beyond the ends of the rows of bristles. The end portions 56 are engaged by shelves 80 on the retainer clips 70, described below.
At each lateral end of the housing 20 a respective combined spring and retainer 60 is provided. The spring and retainer 60 is a single integral piece, preferably of molded plastic so that it will not corrode in the presence of suctioned liquid or wet particulate materials. The spring 62 of the combined spring and retainer 60 is illustrated as "S"-shaped, but it may be "U"-shaped. It includes a curved spring portion 64 which is normally biased against the top of the bar 52. It includes an end portion 66, which is shown as curved, but may end short of the curvature, and which is movable up into contact with the top wall 32 of the cavity 30. The spring is so shaped and is sufficiently resilient to normally bias the bar 52 and thereby the brush 50 out of the cavity 30.
The brush and retainer 60 integrally includes a retainer clip 70 which has a guide leg 72 that extends down the inwardly facing side 44 of the projection 40. The projection 74 at the top of the leg 72 rests atop the shelf 46 and retains the clip in the cavity 30.
The retainer 70 includes a shelf 76 which rests against the bottom of the projection 33 and helps orient the retainer.
At the opposite side of the projection 40 from the leg 72 is the leg 78 of the retainer clip 70, and the leg 78 is straight to mate with the straight, outward wall 42 of the projection 40. The legs 78 and 72 of the retainer clip 70 are spaced apart approximately the width of the projection 40, and this maintains the proper orientation for the spring 62 even as the bar 52 shifts.
The bottom ends of the legs 72 and 78 are joined- by the brush support shelf 80 which is rigidly connected to the legs 72, 78 and also extends beneath the undersides 82 of the end portions 56 of the bar 52. As the spring 62 biases the bar 52 out of the cavity 30, it presses the undersides 82 of the bar 52, 56 against the opposed support shelves 80, which holds the bar 52 of the brush in the cavity at the position of furthest projection out of the cavity.
As force is applied to the bristles 54 to push them into the cavity, this pushes up on the bar 52 and the bar, in turn, deforms the spring 62, which permits the bar 52 and the bristles 54to move into the cavity. Note the broken line positions of the spring 62 and the bar 52 in Fig. 2. As the force upon the bristles 54 is released, the spring 62 urges the bar 52 and the bristles 54 outwardly, until the end portions 56 of the bar 52 again come to rest on the shelf 80 of the retainer clip 70. Note the solid line positions of these elements in Fig. 2.
The retainer clip 70 can be easily pried out of its position in the housing cavity 30 by first pushing up on an end of the bar 52 and then pulling upon the shelf 80 until the retainer clip 70 is sufficiently deformed to free it from the projection 40. After removing the clips 70 from their projections 40, the retainers and springs 60 can be removed to permit replacement of the brush. The retainer clips 70 are then disposed over the bars 52 as previously and are simply snapped into place on the projections 40, returning the brush to use.
Although the present invention has been described in connection with a preferred embodiment thereof, many variations and modifications will now become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims.

Claims

1. A nossle (10) with a retractable brush (50) for the intake of a vacuum cleaner (14), wherein the nozzle (10) comprises:

a nozzle housing (20) having a bottom side and having lateral ends; a suction inlet (24) which opens to the bottom side of the housing (20); the inlet (24) having a first side with respect to motion of the nozzle housing (20); the first side of the inlet (24) being defined in the housing (20);

a respective brush carrier (40) in the housing (20) and located toward each lateral end of the housing (20) and also located outside of and at the first side of the inlet (24);

a brush (50) extending along the first side of the inlet (24); the brush (50) including a supporting element (52) for being supported in the housing (20) and including brushing means (54) supported beneath the supporting element (52) and projecting beneath the bottom side of the housing (20) for brushing material before the brush (50) as the

nozzle housing (20) is moved; characterized by further comprising:

a respective integral brush spring (62) and spring retainer (70) for each brush carrier (40);

a respective stationary retaining means (70) for nonmovingly engaging the respective brush carrier (40) in the housing (20); each retaining means (70) also being for holding the brush supporting element (52) removably in the housing (20),

a spring (62) attached to and extending from the stationary retaining means (70) into contact with the brush supporting element (52) and normally urging the brush supporting element (52) out of the bottom side of the housing (20), and

a stationary shelf (80) formed on the stationary retaining means (70) and projecting beneath a part of the brush supporting element (52) engageable by the brush supporting element (52) after the brush (50) has moved a distance out of the housing (20) for preventing the brush supporting element (52) from moving fully out of the housing (20) while permitting the brush supporting element (52) to shift into the housing (20) off the shelf (80) against the bias of the spring (62).

2. The nozzle of claim 1, wherein the spring (62) also extends from the brush supporting element (52) toward the housing' (20), without engaging the housing and the spring (62) is placed and shaped to be movable against the housing (20) as the brush supporting element (52) is moved into the housing (20) against the bias of the spring (62).

3. The nozzle of claim 1, wherein the spring (62) and spring retainer (70) are both of plastic.

4. The nozzle of claim 3, wherein the spring (62) and spring retainer (70) are an integral one piece unit.

5. The nozzle of claim 1, further comprising the nozzle housing (20) defining a brush cavity (30) that is located outside the inlet (24) and at the first side of the inlet (24); the brush carrier (40), the spring (62) and the retaining means (70) being disposed in the brush cavity (30); the brush cavity (30) having a first wall (34) at the first side of the inlet (24) and having a second wall (36) which is spaced from the first wall (34) for defining the brush cavity (30) between the first and second walls (34, 36);

the brush supporting element (52) being of a front to back width to contact the first (34) and second (36) walls of the brush cavity (30) for preventing the brush supporting element (52) and the brush (50) from shifting toward either of the first (34) and second (36) walls as the nozzle housing (20) is moved in either of the directions toward the first (34) and second (36) walls.

6. The nozzle of claim 1, wherein the spring (62) is a leaf spring, including a rounded section (64) which extends from the retaining means (70) and rests upon the brush supporting element (52), and including an extension (66) from the rounded section (64) of the spring, which extension (66) is for pressing upon the housing (20) at the interior thereof as the brush supporting element (52) is pushed into the brush cavity (30).

7. The nozzle of claim 6, wherein the spring (62) and the retaining means (70) are an integral one piece structure.

8. The nozzle of claim 7, wherein the spring (62) and the retaining means (70) are both of plastic.

9. The nozzle of claim 1, wherein the brushing means (50) comprises bristles (54) projecting a length that with the brush supporting element (52) resting on the shelves (80) of both the retaining means (70), the bristles (54) project a distance beneath the bottom side of the housing (20) so that pressure applied to the bristles (54) urge the brush (50) and the brush supporting element (52) into the housing (20) against the bias of the spring (62).

10. The nozzle of claim 1, wherein the retaining means (70) is removably clipped to the respective brush carrier (40) therefor.

11. The nozzle of claim 10, wherein the brush carrier (40) is in the form of a projection supported in the nozzle housing and extending toward the bottom side of the housing (20), and the retaining means (70) includes a leg for engaging the brush carrier (40).

12. The nozzle of claim 11, wherein the retaining means (70) comprises a pair of legs (72, 78) which engage the brush carrier (40) along opposite sides thereof.

13. The nozzle of claim 12, further comprising the nozzle housing (20) defining a brush cavity (30) that is located outside the inlet (24) and at the first side of the inlet (24); the brush carrier (40), the spring (62) and the retaining means (70) being disposed in the brush cavity-(30); the brush cavity (30) having a first wall (34) at the first side of the inlet (24) and having a second wall (36) which is spaced from the first wall (34) for defining the brush cavity (30) between the first (34) and second (36) walls;

the brush supporting element (52) being of a front to back width to contact the first (34) and second (36) walls of the brush cavity (30) for preventing the brush supporting element (52) and the brush (50) from shifting toward either of the first (34) and second (36) walls as the nozzle housing (20) is moved in either of the directions towards the first (34) and second (36) walls.

14. The nozzle of claim 12, wherein the shelf (80) is attached to the legs (72, 78) of the respective retaining means (70) and extends a distance from the respective legs (72, 78) toward the other lateral end of the housing (20).

15. The nozzle of claim 14, wherein the brush carrier (40) includes a respective second shelf (46) thereon and the retaining means leg (72) facing the brush carrier (40) has a respective surface that is seated on the shelf (46) for latching the retaining means (70) to the brush carrier (40), and that leg (72) of the retaining means (70) being deformable for unlatching the retaining means (70) from the brush carrier (40).