US3480987A

US3480987A - Cleaner assembly

Info

Publication number: US3480987A
Application number: US683435A
Authority: US
Inventors: Harold W Schaefer
Original assignee: National Union Electric Corp
Current assignee: White Consolidated Industries Inc
Priority date: 1967-11-13
Filing date: 1967-11-13
Publication date: 1969-12-02
Anticipated expiration: 1986-12-02
Also published as: DE1703797C3; DE1703797B2; BE718611A; NO124905B; DE1703797A1; GB1177920A; NL6810677A; FR1575161A; DK122102B; SE340343B; NL137388C

Description

Dec. 2, 1969 HQW. SCHAEFER 3,430,937 v CLEANER ASSEMBLY Filed Nov. 13, 1967 5 Sheets-Sheet l Dec. 2, 1969 H. w. SCHAEFER 3,480,987

CLEANER ASSEMBLY Filed Nov. 13, 1967 5 Sheets-Sheet 5 Dec. 2, 1969 H. w. SCHAEFER CLEANER ASSEMBLY 5 Sheets-Sheet 4 Filed Nov. 13, 1967 Dec. 2, 1969 w SCHAEFER 3,480,987

CLEANER AS SEMBLY Filed Nov. 15, 1967 5 Sheets-Sheet 5 United States Patent T 3,480,987 CLEANER ASSEMBLY Harold W. Schaefer, Bloomington, Ill., assignor to National Union Electric Corporation, Stamford, Conn., a corporation of Delaware Filed Nov. 13, 1967, Ser. No. 683,435

Int. Cl. A471 9/24 US. Cl. -323 6 Claims ABSTRACT OF THE DISCLOSURE Canister type vacuum or suction cleaners commonly include a fan or suction assembly mounted in a casing for drawing air entrained dirt and other particles through an elongated flexible hose into a filter in the casing. The hose is normally detached from the casing for storage and reattached to the casing before subsequently using the vacuum cleaner. The long light hose is usually stored by hanging the hose over a hook extending from a wall of a closet. These prior art canister type vacuum cleaners also include a relatively heavy compact casing and fan assembly which is commonly stored on the floor of the closet. This combination of a heavy casing and elongated hose requires extensive storage space on both a wall and floor of a closet. This storage space is often unavailable or at a premium in apartments, small houses, and other buildings.

In addition to requiring extensive storage space, prior art canister type vacuum cleaners are often heavy and difficult to handle. The heavy weight of these vacuum cleaners results from the relatively expensive casing which is usually fabricated from a plurality of steel members. While a steel casing is strong and durable, it is also expensive and difficult to move up and down stairs between floors of a residence.

In view of the preceding remarks it is apparent that prior art vacuum cleaners are both difficult to store and to use. Therefore, it is an object of this invention to provide a suction type cleaner assembly which overcomes the aforementioned shortcomings of prior art constructions. Specifically, it is an object of this invention to provide a canister type suction cleaner assembly having a hose which can be stored in a casing or housing for the cleaner assembly without opening the casing.

Another object of this invention is to provide a novel canister type suction cleaner assembly having a hose which can be stored in the housing with the hose connected to a filter and a suction assembly within the hous- Another object of this invention is to provide a novel and improved canister type suction cleaner assembly having a strong, inexpensive and light weight casing which is readily assembled.

Another object of this invention is to provide a novel and improved canister type suction cleaner assembly of circular configuration having a com-pact light weight casing for holding a fan or suction assembly and for storing a hose.

Another object of this invention is to provide a suction cleaner assembly having integrally formed base and cover sections to provide a motor-fan housing, a hose compartment, a filter compartment, and a storage compartment for replacement filter bags.

3,480,987. Patented Dec. 2, 1969 These and other objects and features of the invention will become more apparent upon consideration of the following detailed description taken in connection with the accompanying drawings wherein:

FIG. 1 is a perspective View of a suction cleaner assembly forming a preferred embodiment of the invention, the cleaner assembly being shown in an operating position;

FIG. 2 is an enlarged perspective view of the suction cleaner assembly of FIG. 1, the cleaner assembly being shown in a storage position with a cover section raised to expose the interior of the cleaner assembly;

FIG. 3 is an enlarged sectional view of the suction cleaner assembly of FIG. 2, the suction cleaner assembly being shown in a storage position with the cover section in a normal or closed relationship with a base section of the cleaner assembly;

FIG. 4 is a plan view, on a reduced scale, of the suction cleaner assembly of FIGS. 2 and 3, the cover section of the cleaner assembly being partially broken away ,to. expose a connector assembly for a filter bag;

FIG. 5 is an enlarged partially disassembled perspective view of the filter bag connector assembly of FIG. 4;

FIG. 6 is an enlarged sectional view, taken along the line 6-6 of FIG. 4, further illustrating the structure of the filter bag connector assembly;

FIG. 7 is a bottom perspective view of a housing for the cleaner assembly, a base plate assembly having been removed to expose a plurality of guards which project axially outwardly from the base section of the cleaner assembly;

FIG. 8 is an enlarged plan view of the base plate assembly, the guards of FIG. 7 being shown in section in FIG. 8 to illustrate their relationship to the base plate assembly;

FIG. 9 is an enlarged perspective view of the cleaner assembly in the storage position, the cleaner assembly being shown with a carrier frame mounted on the cover section for holding a plurality of cleaning tools;

FIG. 10 is a plan view of the too]. carrier frame of FIG. 9, the cleaning tools having been removed to better reveal the structure of the carrier frame;

FIG. 11 is a sectional view, taken along the line 1111 of FIG. 10, further illustrating the structure of the tool carrier frame; and

FIG. 12 is an enlarged sectional view, taken along the line 12-12 of FIG. 10, illustrating latch or retaining elements which provide a connection between the carrier frame of FIGS. 9 and 10 and a raised. control panel on the cover section of the housing.

Referring now to the drawings in greater detail, a suction cleaner assembly 20 is illustrated in FIG. 1 in an operating position with a flexible hose or conduit 22 extending outwardly from a generally circular housing or casing 24. The hose 22 is connected at an outer end portion 26 to a cleaning tool assembly 28. The hose 22 is connected at an inner end portion 30 to a connector assembly for a filter bag 38 which is arcuately disposed within the housing 24, and a fan and motor assembly or suction unit 32 (see FIG. 2) is centrally mounted in the housing or casing 24. During use, dirt and other foreign materials, from a floor or other surface 34, are entrained in air drawn through the cleaning tool assembly 28 and the flexible hose 22 by the suction unit 32. The air entrained dirt and other materials are trapped in a primary filter comprising the bag 38, of known construction, as the air is drawn through the bag by the suction unit 32. The relatively clean filtered air is then drawn through a secondary filter sheet 40 which is disposed over an air intake to the suction unit 32. The clean, twice filtered air is then exhausted from the bottom of the casing or housing 24 by the suction unit.

The flexible hose 22 is stored in an annular chamber or cavity formed between a generally circular radially outwardly extending end or base wall section 46 and a generally circular radially outwardly extending end or cover section 48 of the housing 24. The cover section 48 is pivotally connected to the base section 46 for movement from a normal or closed position, shown in FIG. 1, to an open position, shown in FIG. 2. When the cover section 48 is in the open position, an interior arcuate filter bag chamber 50 is exposed to enable the filter bag 38 to be readily replaced.

The flexible hose 22 is moved from the operating position of FIG. 1 to the storage position of FIG. 2 by wrapping the hose around an axially extending intermediate or medial section 52 of the housing 24 while the cover 48 is closed and the hose 22 is still connected at its inner end portion 30 to the filter bag connector assembly. A clamp 56 extends outwardly from the medial section 52 to engage the outermost end portion of the hose and hold the hose in the storage position, Although the hose 22 has been illustrated as having a length which provides approximately two windings around the medial section 52, it will be apparent to those skilled in the art that the cavity 44 can be sized to take a hose 22 of any desired length. Of course, the number of windings of the hose around the medial section 52 when the hose is in the storage position will vary as a direct function of the length of the hose. It is contemplated that the suction cleaner assembly will be stored in an upright position resting on legs 53 (FIG. 4) which are integrally formed with the base section 46.

The structure of the housing or casing 24 is shown in considerable detail in FIG. 3. The cover section 48 of the housing 24 is integrally molded of a suitable polymeric material, such as polystyrene, and is connected by a hinge 60 to the base section 46 which is also integrally molded of a suitable polymeric material, such as ABS plastic. A resilient combination stop and spring member 62 interconnects the base section 46 and the cover section 48 to limit the upward movement of the cover section 48 relative to the base section as the cover section 48 is pivoted to the open position. A manually releasable latch assembly 64, of known construction, is provided at a front portion of the suction cleaner to hold the cover section 48 in the closed position. When the over section is in the closed position, an annular upper rim or lip portion 66 extends axially downwardly toward the base section 46 which includes an annular lower rim or lip 68 which extends axially upwardly toward the cover section 48. When the hose 22 is in the storage position, as illlustrated in dashed lines in FIG. 3, the upper and

lower rims

66 and 68 partially enclose the hose 22 to protect the hose and to hold the hose in the cavity 44. An annular mouth or circumferential opening 72 is defined by the opposed innermost edge portions of the

rims

66 and 68. The mouth 72 is somewhat larger than an outermost diameter of the hose 22 to enable the hose to be readily moved between the operating and storage positions when the cover section 48 is in the closed position.

An annular gasket or seal 76 is mounted on an inner side of the cover 48. The gasket 76 engages an upper or outer end portion of a generally cylindrical axially extending side wall 78 of the base section 46 to seal the filter bag or air intake chamber 50. Of course, the side wall 78 substantially forms the medial section 52 of the housing 24. The suction unit 32 is mounted on a flange or rim 80 which projects radially inwardly from an axially extending generally cylindrical wall 82 of the base section 46. The

walls

78 and 82 are concentric and define an annular space to receive the arcuately disposed filter bag 32. Air and dirt and other foreign particles are drawn through the hose 22 by the suction unit 32 into the arcuately disposed filter bag 38 in the intake chamber 50. The air is then drawn through porous walls of the filter bag 38 and through the filter sheet 40 and is blown under pressure into an exhaust or plenum chamber 86 formed by a base plate assembly 88 and a lower or outer surface of the integrally molded base section 46. The air flows under pressure through exhaust apertures 89 and 90 (see FIG. 8) in the base plate assembly 88 to the surrounding atmosphere. A selector slide or member 91 is movably mounted on a raised control panel or section 92 located at the front portion of the cover 48. By moving the selector slide 91, a port or opening (not shown) is selectively opened or closed to control a flow of air directly into the intake chamber 50 and to thereby regulate the quantity of air drawn through the hose 22. Thus, the suction unit 32 draws air through the hose 22 and filter bag 38 into an intake chamber 50. The air is then drawn through a secondary filter 40 and exhausted to the chamber 86. The clean, twice filtered air then flows to the

surrounding atmosphere apertures

89 and 98 in the base plate assembly 88.

The suction unit 32 is energized by electrical energy conducted through a cord 93. The operation or energization of the suction unit 32 is controlled by a switch 94 in the base plate assembly 88. The switch 94 is actuated by rocking or pivoting a handle 95 about a pivot pin 96. This pivoting action moves a downwardly or outwardly extending lever or plate section 98 inwardly against a biasing or return spring to engage and actuate the switch 94. The switch 94 is connected to the cord 93 and suction unit 32 by suitable leads, indicated at 102 in FIG. 3. Of course, the control switch 94 for the suction unit 32 could, if desired, be mounted on the control panel 92 rather than the base plate assembly 88. The combination handle and switch actuator 9598 is further described and claimed in the copending application of Robert C. Lagerstrom, Ser. No. 685,532, filed Nov. 24, 1967.

In view of the preceding remarks it can be seen that the suction cleaner assembly 20 is made up of four basic coaxial components, that is the base section 46, the cover section 48, the suction unit 32 and the base assembly 88. This construction of the suction cleaner 20 greatly facilitates assembling the cleaner since it is merely necessary to mount the suction unit 32 on the base section 46, and mount the base plate assembly 88 on the base section 46 after having electrically interconnected the suction unit 32 and the base plate assembly. The assembly of the suction cleaner 20 is completed by connecting the cover section 48 to the base section 46 with the hinge 60. The use of an integrally molded base section 46 and integrally molded cover section 48 minimizes the number of pieces required to form the housing or casing 24 for the cleaner assembly 20. It will also be apparent to those skilled in the art that the use of the molded polymeric base and cover

sections

46 and 48 substantially reducesthe weight of the cleaner assembly 20 while providing the necessary strength and rigidity required to withstand the severe treatment to which cleaner assemblies are frequently subjected by their users. The provision of a peripheral hose storage chamber of cavity 44, so that the hose 22 can be stored and protected within the casing or housing 24, increases the ability of the cleaner assembly 20 to withstand such treatment. It should also be noted that the provision of the hose storage chamber or cavity 44 eliminates the necessity of providing separate storage locations for the hose 22 and the housing or casing 24 while insuring that the hose does not become lost or misplaced.

As is perhaps best seen in FIG. 4, an arcuate partition or retaining wall 114 extends upwardly from the base section 46 toward the cover section 48 to hold a supply of auxiliary or extra filter bags 116 formed in a compact roll. The auxiliary filter bags 116 function as replacements for the filter bag 38 when the filter bag 38 becomes full of dirt or otherwise inefiective to act as a filter. By storing the replacement filter bags 116 in the intake chamber 50, the replacement filter bags are protected by the casing or housing 24 and are readily accessible when the cover section 48 is raised to change the original filter bag 38.

A connector or coupling assembly 120 is provided for interconnecting the filter bag 38 and the innermost end portion 30 of the hose 22 (see FIG. 2). The end portion 30 of the hose 22 is releasably coupled to the connector assembly 120 at a generally Wedge shaped recess or indentation 122 formed in the side wall 78. The recess 122 is partially defined by an end wall 124 which is integrally formed with and extends generally radially inwardly from the side wall 78. The recess 122 enables the flexible hose 22 to be attached to the connector assembly 120 with a minimum of bending of the hose since the end wall 124 extends generally radially inwardly from the side wall 78 to enable the hose to be positioned with its longitudinal axis displaced a minimum amount from a tangential relationship with the side wall 78. This relatively straight hose connection minimizes the resistance to flow of fluid entrained materials from the hose 22 to the filter bag 38.

Continuing with reference to FIGS. 5 and 6, it can be seen that the connector assembly 120 includes a resilient spring clamp 130 which extends outwardly from an inner side of the end wall 124 to engage an upper edge portion of a base or plate section 132 of a tubular filter bag coupling member 134. The filter bag 38 is attached to the coupling member 134 in a well known manner, as shown in FIG. 4. A lower edge portion of the base plate 132 is disposed behind and engages a mounting flange or protuberance 138 extending upwardly from the base section 46 at a location opposite from the clamp 130. A resilient seal or gasket 140 is mounted on the end wall 124 and is engaged by a flat transversely extending end surface of the base plate 132 to seal a joint between the coupling 134 and the end wall 124. When the coupling member 134 is moved from a spaced apart relationship with the gasket 140, as shown in FIG. 5, to a sealing relationship with the gasket 140, as shown in FIG. 6, the base plate 132 is positioned in engagement with the flange 138 and pivoted into engagement with the clamp 130 to compress the resilient seal 140. The resilient seal 140 then urges or presses the coupling member 134 outwardly into engagement with both the clamp 130 and the flange 138. An outer hose connector or coupling fitting 144 of known construction is positioned on an outer side of the end wall 124 to detachably connect the innermost end portion 30 of the hose 22 to the end wall 124 to form a continuous fluid passage, extending through an aperture 146 in the end wall 124, between the hose 22 and the filter bag 38.

In view of the foregoing remarks it is apparent that r by utilization of a flange or protuberance 138 which is integrally formed with the base section 46, the connector assembly 120 requires a minimum of components to securely interconnect the hose 22 and the bag 38. The connector assembly 120 provides this connection by substantially aligning a longitudinally extending axis of the filter bag and a longitudinally extending axis of the hose 22 to form a relatively smooth continuous connection between the hose 22 and the filter bag 38. The relatively smooth continuous connection minimizes depositing or entrapment of dirt and other materials entrained in air conducted through the connector assembly 120 so that the dirt is deposited in the filter bag 38. It should also be noted that the connector assembly 120 can be readily released, by merely lifting the spring clamp 130 upwardly, to facilitate replacement of the original filter bag 38 with one of the filter bags 116.

The housing 24 is shown in FIG. 7 with the suction unit 32 and base plate assembly 88 removed to expose a plurality of guards or deflectors 150 which extend downwardly from a generally annular bottom wall 152 of the base section 46. The guards 150 are integrally molded with the base section 46 and extend downwardly adjacent to apertures in the base plate assembly 88 (see FIG.

8) to block the insertion of fingers and foreign objects into the exhaust chamber 86. In addition, the guards hold the cord 93 in position on a cord reel assembly 156 which is mounted on the base assembly 88. Accordingly, a first positioning or deflector guard 158 (see FIG. 8) is mounted adjacent to the exhaust aperture 89 and extends into a generally tangential relationship with the cord reel assembly 156 to block the insertion of objects through the exhaust aperture 89 and, at the same time, to hold the cord 93 in place on the cord reel assembly 156. A second set of guard partitions or

deflectors

160 and 162 are mounted adjacent to the exhaust aperture 90 to prevent the insertion of articles through the aperture 90. It should be noted that the guard or deflector 162 also cooperates with the cord reel assembly 156 in much the same manner as does the guard or deflector 158. A fourth guard 164 is provided for holding the cord 93 in place on the cord reel assembly 156. The guards 158 through 162 also serve to soften or reduce the blast or pressure of exhaust air flowing through the

apertures

89 and 90.

Continuing with reference to FIG. 8, the base plate assembly 88 also includes a cord reel actuator lever or pedal which is pivotally mounted on a base plate portion 171 to operate the cord reel assembly to retract the extended cord 93 in a well known manner. In addition, a plurality of mounting recesses or sections 172 are formed in the base plate portion 171 for rollers or casters 174 (see FIGS. 2 and 3). It should be noted that the base plate assembly 88 is assembled as a separate unit prior to connection to the base section 46 to facilitate the assembly of the suction cleaner 20.

A tool carrier frame or mounting assembly is illustrated in FIG. 9 mounted on the cover section 48 of the suction cleaner 20. The tool carrier frame 180 is detachably connected to the cover section 48 to support a plurality of cleaning tools 182 on the cover section 48 where the cleaning tools are readily accessible during use of the cleaner assembly. As is perhaps best seen in FIG. 10 taken in connection with FIG. 11, the carrier frame 180 includes a plurality of spaced apart upwardly projecting tool engaging sections or turrets 184 which support the cleaning tools 182 as shown in FIG. 9. The carrier frame 180 also includes at one end thereof a plurality of downwardly extending resilient mounting tabs or

tangs

188 and 190 which engage the depending annular rim or lip portion 66 of the cover section 48 to hold a first end section of the tool carrier frame 180 in secure abutting engagement with the cover section 46. A second end section of the tool carrier frame 180 includes an aperture 194 through which the control panel 92 extends. A pair of resilient mounting elements or

fingers

196 and 198 extend inwardly from the sides of the tool carrier frame 180 to engage recesses formed on opposite sides of the upwardly extending control panel 92 (see FIG. 12).

The carrier frame 180 is readily mounted on the cover section 46 by hooking the downwardly extending

tabs

188 and 190 over the rim portion 66 of the cover section 46 and swinging the carrier frame 180 downwardly to position the control panel 92 in the aperture 194. The

resilient fingers

196 and 198 are then moved into engagement with the control panel by merely pressing downward on a front portion of the carrier frame 180. Of course, the carrier frame can be disconnected from the cover section 48 by lifting upwardly on the front end portion of the carrier frame to snap the

resilient fingers

196 and 198 out of engagement with the control panel 92. When the carrier frame 180 is disconnected from the casing, the aperture 194 facilitates manually gripping the frame and hanging the frame on a support member.

It is believed to be advantageous at this time to provide a functional description of the mode in which the component parts of the suction cleaner assembly cooperate. It is contemplated that the suction cleaner assembly 20 will be stored as shown in FIG. 9 with the hose 22 wound or wrapped around the medial section 52 of the base 46 (see FIG. 2 also). When the suction cleaner 20 is to be used, the cleaner will be moved out of storage and the outermost end portion 26 of the hose will be disengaged from the clamp 56. The hose will then be unwound from the housing or casing 24 and one of the cleaning tools 182 will be removed from the carrier 180 and attached to the outermost end portion 26 of the hose 22. The fan and motor assembly or suction unit 32 will then be started by depressing the handle 95 to actuate the switch 94. Air will be drawn by the suction unit 32 through the hose 22 into the filter bag 38 where dirt and other particles entrained in the air will be filtered out of the air as the air passes through the porous side walls of the filter bag into the intake chamber 50. The air will then flow through the secondary filter sheet 40 and be exhausted from the suction unit 32 to the chamber 86 and through

apertures

89 and 90 in the base plate assembly 88 to the surrounding atmosphere. It should be noted that the relatively light weight integrally molded base section 46 and cover section 48 will facilitate movement of the suction assembly to various locations during the cleaning operation.

After the cleaning operation has been completed, the cleaning tool will be removed from the outer end of the hose 22 and repositioned on the carrier frame 180. The hose 22 will then be stored by merely wrapping or winding the hose around the medial portion or section 52 of the housing or casing 24 without opening the cover 48. After the hose has been wound around the casing and engaged by the clamp 56, the suction cleaner assembly can be moved to a storage location. It should be noted that the innermost end 30 of the hose 22 will remain attached to the connector assembly 120 to facilitate subsequent use of the suction cleaner assembly.

When a filter bag 38 becomes loaded with dirt and other foreign materials, the filter bag can be readily replaced by merely raising the cover section 48 and disengaging the coupling 134 from the clamp 130 to disconnect the filter bag from the housing 24. It will be noted that the cover section 48 can be moved to open position for access to the intake chamber 50 without disturbing the connection between the hose 22 and the chamber 50. The original filter bag 38 can then be disconnected from the coupling 134 and one of the replacement filter bags 116 can be removed from its storage position in the intake chamber 50 which is now open due to the previous opening of the cover section 48. After the replacement filter bag has been attached to the Coupling 134, the replacement filter bag will be mounted in the arcuate intake chamber 50 by positioning the base section of the coupling 134 in engagement with the upwardly extending flange 138 and pivoting the coupling 134 into engagement with the clamp 130 (see FIG. 6).

What is claimed is:

1. A body structure for a canister type cleaner, comprising:

a first generally circular end section comprising a base portion of the body structure, said first end section having a generally cylindrical wall portion aifixed at one end thereof to said first end section and extending axially therefrom;

a second generally circular end section comprising a cover portion of the body structure hingedly connected to said wall portion and having a sealing engagement with the opposite end of said wall portion when said cover portion is closed, an air intake chamber being defined within said wall portion between said end sections for housing a suction means and a filter bag; and

connector means on said wall portion for connecting one end of an elongated suction hose to said chamber in fluid communication with the filter bag disposed therein;

said generally circular end sections extending transversely of said wall portion at the opposite axial ends thereof when said cover portion is closed, said end sections projecting radially outwardly beyond said wall portion in axially spaced relation and defining therebetween a circumferentially opening hose storage cavity adapted to receive and retain the hose in wound relation around the outside of said wall portion, and said cover portion being movable to open position for access to said chamber without disturbing the connection between the hose and said chamher.

2. The structure of claim 1 further characterized in that said first end section has inner and outer coaxial generally cylindrical wall portions each aflixed at one axial end thereof to said first end section, said connector means being provided on said outer wall portion and said cover portion having sealing engagement with the opposite axial end of said outer wall portion, said inner wall portion bein g provided with means for supporting the suction means, and said wall portions defining a generally concentric space therebetween within said chamber for receiving the filter bag in arcuately disposed relation therein.

3. The structure of claim 2 further characterized in that an inwardly extending indentation is formed in said outer wall portion for accommodating said one end of the hose, and said connector means is provided in said indentation.

4. The structure of claim 3 further characterized in that said indentation is formed by a pair of angularly related partitions extending between said outer wall portion and said inner wall portion, said connector means being mounted on one of said partitions, and holder means is provided adjacent the other of said partitions for storing a supply of replacement filter bags.

5. The structure of claim 2 further characterized in that said outer wall portion has an inwardly extending recess including an end wall extending generally radially between said inner and outer wall portions, and said connector means is mounted on said end wall, whereby said one end of the hose is adapted to extend into said recess to said connector means with minimum bending of the hose from its tangential wound relation around said outer wall portion.

6. The structure of claim 5 further characterized in that said first end section includes a protuberance extending adjacent to said end wall, and said connector means includes a coupling having a first end portion positioned in abutting engagement with said protuberance, a clamp engaging a second end portion of said coupling, and a seal engaging an intermediate portion of said coupling, said seal resiliently engaging said coupling to urge said coupling into engagement with both said protuberance and said clamp to form a substantially fluid-tight connection between the filter bag and the hose.

References Cited UNITED STATES PATENTS 2,233,167 2/1941 Holm-Hansen 15-323 X 2,716,465 8/1955 Meyerhoefer 15-323 X 2,731,103 1/1956 Ortega 15-323 X 2,734,594 2/1956 Meeker 15-327 X 2,918,692 12/1959 Martinec 15-323 2,959,804 11/1960 Faber 15-323 X 2,997,728 8/1961 Gaudry 15-323 3,132,932 5/1964 Pauler et al.

3,344,588 10/1967 Szabo 15-327 X ROBERT W. MICHELL, Primary Examiner US. Cl. X.R. 15-327