Drain cleaning apparatus

Background of the Invention

This invention relates to the art of drain cleaning apparatus and, more particularly, to improvements in connection with directing and feeding a cable into a drain or waste line to be cleaned.

Drain cleaning apparatus of the character to which the present invention is directed is generally comprised of a motor driven snake or drain cleaning cable drum in which the drain cleaning cable is wound about the axis of the drum and is rotatable therewith. The drum has an open front end through which a free or outer end of the cable extends for entrance into a drain to be cleaned

The snake or drain cleaning cable in such apparatus, as is conventional, is an elongate, flexible member made of tightly wound spring wire, and the free or outer end thereof is adapted to be pulled from or pushed back into the drum in which the cable is stored during periods of non-use. In many such apparatus, the drum, or a cable cartridge within the drum, can be removed to facilitate connecting successive lengths of cable for feeding into a waste line, or for using different diameter drain cleaning cables with the apparatus. Often, drain cleaners of the foregoing character not only require that the cable be manually pulled or pushed relative to the cable drum housing, but also require the operator to manually bend or flex the cable in order to direct it into the entrance of a drain or waste line to be cleaned. Even though an operator may wear gloves, whereby his or her hands are protected from dirt and/or abrasive contact with the drain cleaning cable, such protection is not obtained in the absence of gloves and, in any event, pulling, pushing and flexing the cable into position is inconvenient for the operator.

In US-A-3,370,599, which discloses a drain cleaning apparatus as defined in the precharacterizing portion of independent claim 1, there is provided a rigid elbow tube for guiding the cable to the entrance of a sewer conduit to be cleaned. A cable feed device is located between a cable guide nozzle of the drum and the elbow tube.

Summary of the Invention

In accordance with the present invention, improvements are provided by which the foregoing problems encountered with motor driven drain cleaning apparatus are minimized or overcome.

In accordance with the invention, as defined in the independent claim 1, the outer or free end of a drain cleaning cable extends through a flexible guide tube which is provided on its outer end with a manually operable device for feeding the cable from and to the storage drum, thus to preclude an operator having to manually pull or push the cable relative to the drum. Moreover, the flexibility of the guide tube advantageously enables the operator to direct the free end of the cable into a drain or waste line to be cleaned, whereby both the entrance of the cable into the drain opening and the advancement thereof during the cleaning operation can be achieved without the operator having to touch the cable. Accordingly, the drain cleaning apparatus is more convenient to use than apparatus heretofore available, and the cleaning operation is achieved more quickly and more efficiently than heretofore possible as a result of the flexible guide tube and cable feeding components. Preferably, the flexible guide tube and cable feed device, or the cable feed device alone, are selectively mountable on the apparatus for use with the drain cleaning cable thereof, thereby providing versatility with respect to the options available to an operator in connection with use of the apparatus.

It is accordingly an outstanding object of the present invention to provide improvements in connection with drain cleaning apparatus of the character comprising a motor driven storage drurn in which a drain cleaning cable is coiled about the axis of the drum and has a free or outer end extending outwardly of the drum for entry into a drain or waste line to be cleaned.

Still another object is the provision of apparatus of the foregoing character in which the outer or free end of the drain cleaning cable can be displaced relative to the storage drum and into the entrance of a drain or waste line to be cleaned without hand contact of the cable by the operator.

A further object is the provision of drain cleaning apparatus of the foregoing character in which a manually operable drain cleaning cable feed device is selectively attachable to the apparatus through the use of a flexible guide tube, thus promoting versatility with respect to use of the apparatus by an operator and enabling the extension and retraction of the cable relative to the storage drum and direction of the cable into the inlet end of a drain to be cleaned without hand contact of the cable by the operator.

The apparatus of the foregoing character is more convenient to use than similar apparatus heretofore available and is more efficient in connection with achieving a drain or waste line cleaning operation.

Advantageous features of the invention are recitted in the dependent claims 2 to 14.

Brief Description of the Drawings

The drain cleaning apparatus will be described more fully hereinafter in conjunction with the written description of preferred embodiments of the invention illustrated in the accompanying drawings in which: <ul id="ul0001" list-style="none" compact="compact"><li>FIGURE 1 is a perspective view of drain cleaning apparatus which does not have the flexible cable guide tube and manually operable cable feed device of the invention;</li><li>FIGURE 2 is an exploded perspective view of the apparatus shown in Figure 1;</li><li>FIGURE 3 is a sectional elevation view through the cable cartridge component of the drum assembly and showing a torque arm on the inner end of the cable;</li><li>FIGURE 4 is a perspective view of the torque arm illustrated in Figure 3;</li><li>FIGURE 5 is an end elevation view showing a manually operable cable feed device mounted on a frame component of the apparatus illustrated in Figure 1;</li><li>FIGURE 6 is a sectional elevation view of the cable feed device taken along lines 6-6 in Figure 5;</li><li>FIGURE 7 is a perspective view of one embodiment of a flexible guide tube and cable feed attachment for the drain cleaning apparatus according to the invention;</li><li>FIGURE 8 is a sectional elevation view of the attachment in Figure 7; and,</li><li>FIGURE 9 is a sectional elevation view showing a modification of the flexible guide tube attachment.</li></ul>

Description of Preferred Embodiments

Referring now in greater detail to the drawings, wherein the showings are for the purpose of illustrating preferred embodiments of the invention only and not for the purpose of limiting the invention. Figures 1 and 2 illustrate drain cleaning apparatus 10 comprising a frame 12 which supports a cable drum assembly 14 for rotation about a cable drum axis A. Frame 12 comprises a tubular metal base portion having laterally spaced apart legs 16 interconnected at their forward ends by a U-shaped bridging portion 18 which inclines upwardly and forwardly relative to legs 16. The frame further includes an inverted U-shaped tubular metal frame member having laterally spaced apart legs 20 welded to and extending upwardly from legs 16 of the base portion of the frame and having a bridging portion 22 between the upper ends of the legs, and a mounting and support plate 24 which extends between and is welded or otherwise secured to legs 20. Cable drum assembly 14 is supported on plate 24 for rotation about axis A by a bearing support member 26 which is welded on plate 24, bearing sleeves 28 and 30 received in axially opposite ends of member 26, and a drum shaft 32 rotatably supported by the bearing sleeves and interconnected with the drum assembly as set forth hereinafter. Drum shaft 32 is adapted to be driven by a reversible motor 34 through a pulley and endless belt unit including a pulley 36 mounted on and driven by motor shaft 38, a pulley 40 mounted on the inner end of drum shaft 32 and interconnected therewith such as by a flat so as to rotate the drum shaft, and an endless belt 42 trained about pulleys 36 and 40. Motor 34 is attached to a motor mounting plate 44 by means of a plurality of button head screws 46, and mounting plate 44 is secured to mounting and support plate 24 of the frame by carriage bolts 48 and nuts 50. The drive motor, pulleys and drive belt are enclosed in a housing 52 which is attached to support plate 24 by a plurality of threaded fasteners 54, and housing 52 supports a toggle switch unit 56 for controlling motor 34 and a flexible protective sleeve 58 through which motor power cord 60 extends for connection to a source of AC current. Preferably, frame 12 includes a handle 62 which extends rearwardly over housing 52 and by which the apparatus can be carried.

Cable drum assembly 14 comprises front and rear cable drum housing members 64 and 66, respectively, and an intermediate cable cartridge 68 in which, as will be appreciated from Figure 3, a drain cleaning snake or cable 70 is coiled about axis A. Rear housing member 66 includes a hub 72 which is internally threaded on the inner or rear end thereof to interengage with threaded axially outer end 32a of drum shaft 32 so as to mount the cable drum assembly on shaft 32 for rotation therewith. Rear housing 66 is further secured to drum shaft 32 by a flat head screw 73 which extends through an opening therefor in hub 72 and into a threaded bore in end 32a of the drum shaft. Rear housing member 66 further includes radially inwardly extending ribs 74 which axially slidably interengage with recesses 76 in the outer periphery of cartridge 68 so as to engage the latter with housing member 66 for rotation therewith. Cartridge 68 is axially retained in rear housing member 66 by front housing member 64 which is secured to housing member 66 by a plurality of headed fasteners 78 in the outer ends of ribs 74 and drum clips 79 mounted on front housing member 64 and providing bayonet slots for fasteners 78. Front housing member 64 has a forwardly extending hub 80 to which an exit collar 82 is secured by means of a set screw, not designated numerically, and cable 70 extends through the hub and exit collar drum from cartridge 68 and has a free or outer end 84 for entry into a drain or waste line to be cleaned. Accordingly, it will be appreciated that the hub and exit collar provide an opening at the front of cable drum assembly 14 through which the free end of the drain cleaning cable extends for entry into a drain to be cleaned.

In the embodiment illustrated in the drawings, and as best seen in Figure 3, cable drum cartridge 68 includes an outer peripheral wall 86, a closed inner or rear end defined by a peripheral wall 88 extending radially inwardly from wall 86 and an axially forwardly extending peripheral wall 90 spaced radially inwardly from outer wall 86 and terminating in a cone-shaped forward end wall 92, and a front end defined by a peripheral wall 94 extending radially inwardly from outer wall 86. The radially inner end of wall 94 is spaced radially outwardly from cone-shaped wall 92 and provides a peripheral opening 96 therewith through which cable 70 extends for passage through hub 80 and exit collar 82 of the drum assembly. As will be further appreciated from Figure 3, cable 70 is wound in the cartridge about axis A between the front and rear ends of the cartridge and, as a result of the bias of the spring metal from which the cable is constructed, is biased radially outwardly against wall 86 of the cartridge.

As best seen in Figures 3 and 4 of the drawing, cable 70 has an inner end 98 disposed adjacent the juncture between outer wall 86 and rear wall 88 of the cartridge housing and provided with a torque arm 100 which operates as set forth hereinafter to increase the torque applied to cable 70 in response to rotation of the drum assembly during operation of the drain cleaning apparatus. In the embodiment illustrated, torque arm 100 is constructed from a strip of cold rolled steel and has a mounting end 102 by which the torque arm is attached to end 98 of the cable. More particularly, the torque arm comprises an elongate, planar first leg 104 extending from mounting end 102, and the latter is defined by a pair of second legs 106 each of which is parallel to leg 104 and integrally interconnected therewith by a corresponding U-shaped bridging portion 108. Bridging portions 108 provide mounting end 102 of the torque arm with an axis 110 with respect to which legs 106 are spaced apart from one another and, preferably, the torque arm further includes a finger 112 axially between legs 106 and bridging portions 108 and which is integral with first leg 104 and extends perpendicular thereto and tangential to bridging portions 108. A nut or other block member 114 extends between first leg 104 and the free ends of second legs 106 and is securely fastened thereto such as by weldments 116. Block 114 is provided with a threaded opening 118 therethrough extending radially of axis 110 for receiving a threaded fastener 120, such as a set screw, by which the torque arm is removably mounted on end 98 of the drain cleaning cable. It will be appreciated that legs 106, bridging portions 108 and block 114 define a collar on mounting end 102 of the torque arm which snugly receives and surrounds end 98 of the cable and provides axis 110.

As will be appreciated from Figure 3, leg 104 of the torque arm is adjacent outer wall 86 of the cartridge housing and extends from the juncture between outer wall 86 and rear wall 88 to a point adjacent the juncture between the outer wall and front wall 94. The torque arm is biased radially outwardly by the resiliency and coiled condition of cable 70 in the cartridge housing and frictionally engages outer wall 86 along the length of leg 104 to front edge 104a thereof and into the bridging portions 108 at mounting end 102 of the torque arm. Finger 112 extends radially inwardly from mounting end 102 and engages rear wall 88 of the cartridge housing along upper or radially inner edge 112a of the finger. Accordingly, it will be appreciated that in response to rotation of the cable drum assembly and thus cartridge housing 68 in connection with a drain cleaning operation, torque arm 100 resists sliding of cable 70 relative to the cartridge housing when an obstruction or the like is encountered by the leading end of the snake which is disposed in the drain or waste line being cleaned. While finger 112 contributes to the resistance to sliding, its primary purpose is to stabilize the torque against pivotal movement clockwise in Figure 3 about axis 110 when the radially outward bias on leg 104 by the cable is reduced, such as when the cable is nearly fully extended from the cartridge housing.

In the embodiment illustrated, the cold rolled steel strip of which the torque arm is constructed has a thickness of 1.52 mm (0.06 inch), a width of 19.05 mm (0.75 inch) and a length of 63.5 mm (2.50 inches) from axis 110 to edge 104a of leg 104. Further, the curvature of bridging portions 106 has a radius of 5.58 mm (0.22 inch) with respect to axis 110, and finger 112 has a length of 17.52 mm (0.69 inch) from axis 110 to edge 112a of the finger. Each of the legs 106 and finger 112 have a width of 6.35 mm (0.25 inch) in the direction of axis 110. In a cable drum having the structure described hereinabove and in which the inner end of the drain cleaning cable corresponding to end 98 is not attached to the cartridge housing and does not have a torque arm attached thereto, slippage between the drain cleaning cable and cartridge housing with the free end of the cable held against rotation adjacent exit collar 82 occurs at a torque of between 0.56 and 1.12 Nm (5 and 10 in.-lbs.). In comparison, with a torque arm of the foregoing structure attached to the inner end of the cable, slippage does not occur until a torque of about 3.95 Nm (35 in.-lbs) is applied to the cable by a cartridge housing.

As shown in Figures 5 and 6 of the drawing, U-shaped portion 18 of the base of frame 12 includes a portion 18a extending horizontally across the front end of drum assembly 14 below exit collar 82 thereof, and a manually operable cable feed device 122 is mounted on frame portion 18a by means of a mounting bracket 124 to facilitate the selective feeding of drain cleaning cable 70 outwardly and inwardly relative to drum assembly 14. Cable feed device 122 corresponds structurally and functionally to the cable feed device disclosed in EP-A-0 894 906. Figures 5 and 6 in the present specification correspond respectively to Figures 2 and 4 in EP-A-0 894 906.

As shown in Figures 5 and 6, cable feed device 122 comprises a tubular housing 126 having an axis coinciding with axis A of the apparatus and axially opposite front and rear ends 128 and 130, respectively. Housing 126 includes a wall 132 therein transverse to axis A and having a passage 134 for receiving cable 70. Wall 132 includes roll mounting nodes 136 on the front side thereof, and the feed device includes a pair of cable driving rolls 138 and 140 mounted on nodes 136 by socket head cap screws 142 and 144, respectively. The cap screws provide axes for rotation of the respective driving rolls, and each driving roll axis is skewed both horizontally and vertically relative to the housing axis. Driving rolls 138 and 140 have smooth outer surfaces 146 and 148, respectively, and the skewed mounting thereof provides for driving drain cleaning cable 70 in a well known manner when the cable is rotated and displaced against the driving rolls. Housing 126 further includes a radially extending bore 150 having an inner end which opens into cable passage 134 and which slidably and removably receives a cable drive actuating unit including a drive actuating roll support member 152. Support member 152 has a radially inner end on which a drive actuating roll 154 is mounted by means of a socket head cap screw 156 which provides an axis for the drive actuating roll, and an axially outer end on which an operating knob member 158 is mounted by way of a threaded stem 160 received in a threaded recess therefor in roll support member 152, not designated numerically. Operating knob member 158 is axially adjustable relative to roll support member 152 for adjusting the axial length of the drive actuating unit, and a compression spring 162 surrounds the roll support member between the radially outer end of bore 150 and the underside of operating knob member 158 to bias the drive actuating unit radially outwardly of the housing. Drive actuating roll 154 has a smooth outer surface 164 and, as will be appreciated from Figure 5, the driving rolls and actuator drive roll are equally spaced apart circumferentially about axis A. Further, drive actuating roll support member 152 supports drive actuating roll 154 in housing 12 for the axis of the drive actuating roll to be skewed horizontally with respect to axis A, preferably at the same angle as that of driving rolls 138 and 140 which, preferably, is 30° with respect to both the horizontal and vertical directions of the skew thereof.

The drive actuating unit of feed device 122 is adapted to be displaced radially inwardly of housing 126 against the bias of spring 162 by means of an operating lever 166 which includes a mounting leg 168 and a handle portion 170 extending perpendicular thereto. The front end of housing 126 is provided with a pair of lever mounting ears 172, and mounting leg 168 of the lever is received between ears 172 and has a rolled tubular lower end 174 receiving a pivot pin 176 extending through openings therefor in cars 172 to provide a lever pivot axis transverse to and laterally spaced from axis A. Handle portion 170 extends across the outer surface of operating knob member 158 and is provided with a finger 178 which frictionally engages with the peripheral outer surface of the knob member to releasably hold the drive actuating unit in bore 150 and to restrain rotation of the operating knob member relative to drive actuating roll support member 152.

As mentioned above, cable feed device 122 is adapted to be mounted on frame portion 18a by means of a mounting bracket 124. As seen in Figures 5 and 6, mounting bracket 124 includes an L-shaped bracket plate having a vertical leg 180 and a horizontal leg 182 extending forwardly from the lower end thereof and secured to frame portion 18a such as by a pair of bolts 184 extending upwardly through openings therefor in frame portion 18a and into threaded engagement with nuts 185 welded on leg 182 of the bracket plate. Leg 180 is provided with an opening 186 coaxial with axis A, and the mounting bracket further includes an annular adaptor sleeve 188 mounted on the front side of leg 180 such as by welding and so as to be coaxial with axis A. Inner end 130 of housing 126 of the cable feed device axially receives adaptor sleeve 188 therein, and the housing is provided with diametrically opposed pairs of openings 190 adapted to be aligned with corresponding bores 192 in the radially outer side of adaptor sleeve 188. Openings 190 arc internally threaded to receive the threaded shanks of bolts 194 by which housing 126 and thus feed device 122 is removably mountable on the drain cleaning apparatus.

In operation of the feed device, the component parts thereof are initially in the positions shown in Figure 6, whereby cable 70 rotates relative to housing 126 in response to rotation of the cable drum assembly. There is no axial displacement of the cable at this time in that actuating drive roll 154 is disengaged from the cable. When handle 170 of lever 166 is displaced clockwise from the position shown in Figure 6, drive actuator roll 154 is displaced radially inwardly against cable 70 to displace the latter against drive rolls 138 and 140 as shown in Figure 5. As a result of the skewed disposition of the rolls, they interengage with the rotating cable to cause the latter to advance axially of housing 126 in the direction relative to the housing which depends on the direction of rotation of the cable. In this respect, rotation of the cable in one direction advances the latter axially outwardly from front end 128 of the housing while rotation of the cable in the opposite direction draws the cable axially inwardly of the housing. When it is desired to stop axial displacement of the cable in either direction, handle 170 is released for spring 162 to return the drive actuating unit to the position thereof shown in Figure 6 and in which roll 152 disengages the cable.

In accordance with the invention, as shown in Figures 7 and 8 of the drawing, drain cleaning cable feed device 122 is mounted on the outer end of a flexible guide tube assembly 196 having its inner end detachably connected to adaptor 188 of mounting bracket 124. More particularly, guide tube 196 comprises a flexible hose 198 having coupling arrangements 200 and 202 on the opposite ends of the hose and which respectively provide the axially outer and axially inner ends of the flexible guide tube. Coupling arrangement 200 comprises a ferrule axially received on the outer end of hose 198 and including an inner sleeve 206 extending axially inwardly of the hose, and a connector member 208 having a central flange 209, a recess 210 on one side thereof receiving ferrule 204, and an externally threaded sleeve 212 on the other side thereof. Coupling arrangement 200 further includes a gland ring 214 and a compression nut 216 by which ferrule 204 and thus the corresponding end of hose 198 is attached to connector member 208, and a tubular mounting collar 218 which is internally threaded at one end for threaded interengagement with externally threaded sleeve 212 of connector member 208. Mounting collar 218 is axially received in inner end 130 of housing 126 of the cable feed device and is provided with an outwardly open annular recess 220 which is adapted to receive the inner ends of fasteners 194 provided on housing 126 in diametrically opposed pairs. The inner ends of fasteners 194 and recess 220 are dimensioned for the fasteners to slide circumferentially in the recess, whereby an operator can rotate cable feed device 122 about the axis of the flexible guide tube.

Coupling arrangement 202 comprises a mounting collar having an axially outer end 224 for receiving adaptor 188 of mounting bracket 124 and having an axially inner end which is necked in to provide a cradle 226 underlying the corresponding end of hose 198. A hose clamp 228 and fasteners 229 secure hose 198 to cradle 226 and thus the mounting collar. Collar 224 supports a spring biased mounting plunger 230 which includes a post 232 extending radially through an opening therefor in collar 224 and into one of the bores 192 in adaptor 188. The plunger includes an operating member 234 on the radially outer end of post 232, and a spring unit 236 normally biases post 232 radially inwardly of bore 192. Accordingly, it will be appreciated that the guide tube and cable feed device can readily be detached from the drain cleaning apparatus by pulling outwardly on operating member 234 to withdraw post 232 from bore 192 so as to free the mounting collar 224 for axial separation from adaptor 188. As will be appreciated from Figure 8, when the guide tube is mounted on the drain cleaning apparatus, drain cleaning cable 70 is adapted to extend through the flexible hose and coupling arrangements and outwardly through feed device 122 which is operable in the manner described hereinabove to displace the cable axially in response to rotation of the cable drum assembly. Hose 198 can be of any desired length and, preferably, has a length of about 0.9 m (three feet) which advantageously enables the operator to hold feed device 122 in one hand and to flex the guide tube as is necessary to direct outer end 84 of the cable into a drain or waste line to be cleaned. Accordingly, the operator can perform a drain cleaning operation without having to physically touch the drain cleaning cable.

Figure 9 illustrates a modification of the flexible guide tube shown in Figures 7 and 8 and, in this respect, illustrates a hand grip component 238 which replaces mounting collar 218 of the guide tube assembly shown in the latter figures. Hand grip 238 is a tubular metal member having an axial length and outer diameter to accommodate an operator's hand and is provided at one of the opposite ends thereof with internal threads 240 for threaded interengagement with externally threaded collar 212 of connector member 208. The other end of the hand grip is provided with a radially outwardly open circumferential recess 242 which receives and cooperates with fasteners 194 on the feed device housing to support the feed device for rotation about the axis of the guide tube as described hereinabove in connection with the embodiment of Figures 7 and 8.

While considerable emphasis has been placed herein on the structures and structural interrelationships between the component parts of the preferred embodiments of the invention, it will be appreciated that other embodiments as well as modifications of the embodiments disclosed herein can be made without departing from the invention as defined in the claims.