Cleaning device

Abstract

A cleaning device in the nature of a toilet brush has an external shaft with a gripping handle at one end and an array of bristles, forming a brush, at the opposite end. In internal shaft movable longitudinally within a space inside the external shaft has a chopping blade at one end, which can be made to protrude beyond the brush. The position of the internal shaft is controlled by manually gripping and moving an element that protrudes from the internal shaft though a longitudinal slot in the external shaft. The internal shaft can be locked in its retracted position or in its protruding position by a locking mechanism releasable by pushing inward on the protruding element.

Claims

1. A cleaning device for plumbing fixtures comprising: an elongated first shaft having a manually grippable handle at a proximal end thereof and an array of bristles protruding from a portion of the first shaft adjacent a distal end thereof opposite from said proximal end; and a second shaft elongated in the direction of elongation of the first shaft, said second shaft being mounted to said first shaft for longitudinal sliding movement along said direction of elongation, the second shaft having a manually engageable protrusion adjacent an end thereof nearest said proximal end of the first shaft and having a chopping blade formed at an opposite end thereof, the chopping blade being movable, by manual movement of said protrusion, from a first location adjacent said bristles to a second location spaced in a distal direction from said bristles; wherein said bristles include bristles positioned to come into contact with, and to clean, said chopping blade when the chopping blade is moved reciprocally to and from said first location, wherein said elongated first shaft is formed with a longitudinally extending internal channel having an slot extending longitudinally along at least a part of the length of said first shaft, wherein said elongated first shaft is formed with an opening in said distal end thereof, wherein said second shaft extends through said opening whereby a part of said second shaft is located within said internal channel and a part of said second shaft including said chopping blade extends in a distal direction beyond the distal end of said first shaft, wherein said manually engageable protrusion extends outward from said internal channel through said slot, whereby a user can move said second shaft longitudinally relative to said first shaft by manually engaging and moving said manually engageable protrusion, the cleaning device further including a releasable latch arranged to hold the second shaft in a fixed relationship to said first shaft such that said chopping blade is maintained in said first location; wherein said slot has proximal and distal ends; and wherein said releasable latch comprises: a shoulder formed as a part of said first shaft, said shoulder being located adjacent the proximal end of said slot; and a resilient, flexible part of said second shaft adjacent said end thereof nearest said proximal end of the first shaft, said resilient flexible part including a shoulder-engaging surface releasably engageable with said shoulder to lock said second shaft in a fixed relationship to said first shaft such that said chopping blade is maintained in said first location, said shoulder-engaging surface of said flexible part being urged by the resilience of said flexible part in a direction such that it is engageable with said shoulder; and wherein said manually engageable protrusion is fixed to said flexible part and movable manually to disengage said shoulder-engaging surface from said shoulder and to cause said chopping blade to move toward said second location.

2. A cleaning device for plumbing fixtures comprising: an elongated first shaft having a manually grippable handle at a proximal end thereof and an array of bristles protruding from a portion of the first shaft adjacent a distal end thereof opposite from said proximal end; and a second shaft elongated in the direction of elongation of the first shaft, said second shaft being mounted to said first shaft for longitudinal sliding movement along said direction of elongation, the second shaft having a manually engageable protrusion adjacent an end thereof nearest said proximal end of the first shaft and having a chopping blade formed at an opposite end thereof, the chopping blade being movable, by manual movement of said protrusion, from a first location adjacent said bristles to a second location spaced in a distal direction from said bristles; wherein said bristles include bristles positioned to come into contact with, and to clean, said chopping blade when the chopping blade is moved reciprocally to and from said first location, wherein said elongated first shaft is formed with a longitudinally extending internal channel having an slot extending longitudinally along at least a part of the length of said first shaft, wherein said elongated first shaft is formed with an opening in said distal end thereof, wherein said second shaft extends through said opening whereby a part of said second shaft is located within said internal channel and a part of said second shaft including said chopping blade extends in a distal direction beyond the distal end of said first shaft, wherein said manually engageable protrusion extends outward from said internal channel through said slot, whereby a user can move said second shaft longitudinally relative to said first shaft by manually engaging and moving said manually engageable protrusion; the cleaning device further including a releasable latch arranged to hold the second shaft in a fixed relationship to said first shaft such that said chopping blade is maintained in said second location; wherein said slot has proximal and distal ends; and wherein said releasable latch comprises: a shoulder formed as a part of said first shaft, said shoulder being located adjacent the distal end of said slot; and a resilient, flexible part of said second shaft adjacent said end thereof nearest said proximal end of the first shaft, said resilient flexible part including a shoulder-engaging surface releasably engageable with said shoulder to lock said second shaft in a fixed relationship to said first shaft such that said chopping blade is maintained in said second location, said shoulder-engaging surface of said flexible part being urged by the resilience of said flexible part in a direction such that it is engageable with said shoulder; and wherein said manually engageable protrusion is fixed to said flexible part and movable manually to disengage said shoulder-engaging surface from said shoulder and to cause said chopping blade to move toward said first location.

3. A cleaning device for plumbing fixtures comprising: an elongated first shaft having a manually grippable handle at a proximal end thereof and an array of bristles protruding from a portion of the first shaft adjacent a distal end thereof opposite from said proximal end; and a second shaft elongated in the direction of elongation of the first shaft, said second shaft being mounted to said first shaft for longitudinal sliding movement along said direction of elongation, the second shaft having a manually engageable protrusion adjacent an end thereof nearest said proximal end of the first shaft and having a chopping blade formed at an opposite end thereof, the chopping blade being movable, by manual movement of said protrusion, from a first location adjacent said bristles to a second location spaced in a distal direction from said bristles; wherein said bristles include bristles positioned to come into contact with, and to clean, said chopping blade when the chopping blade is moved reciprocally to and from said first location, wherein said elongated first shaft is formed with a longitudinally extending internal channel having an slot extending longitudinally along at least a part of the length of said first shaft, wherein said elongated first shaft is formed with an opening in said distal end thereof, wherein said second shaft extends through said opening whereby a part of said second shaft is located within said internal channel and a part of said second shaft including said chopping blade extends in a distal direction beyond the distal end of said first shaft, wherein said manually engageable protrusion extends outward from said internal channel through said slot, whereby a user can move said second shaft longitudinally relative to said first shaft by manually engaging and moving said manually engageable protrusion; the cleaning device further including a releasable latch mechanism arranged to hold the second shaft alternatively in a first fixed relationship to said first shaft such that said chopping blade is maintained in said first location and in a second fixed relationship to said first shaft such that said chopping blade is maintained in said second location; wherein said slot has proximal and distal ends; and wherein said releasable latch comprises: a first shoulder formed as a part of said first shaft, said first shoulder being located adjacent the proximal end of said slot; a second shoulder formed as part of said first shaft, said second shoulder being located adjacent the distal end of said slot; and a resilient, flexible part of said second shaft adjacent said end thereof nearest said proximal end of the first shaft, said resilient flexible part including a first shoulder-engaging surface releasably engageable with said first shoulder to lock said second shaft in a fixed relationship to said first shaft such that said chopping blade is maintained in said first location, and a second shoulder-engaging surface releasably engageable with said second shoulder to lock said second shaft in a fixed relationship to said first shaft such that said chopping blade is maintained in said second location, said first and second shoulder-engaging surfaces of said flexible part being urged by the resilience of said flexible part in a direction such that they are respectively engageable with said first and second shoulders; and wherein said manually engageable protrusion is fixed to said flexible part and movable manually to disengage said shoulder-engaging surfaces from said shoulders and to cause said chopping blade to move from one to the other of said first and second locations.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a front elevational view of a cleaning device in accordance with the invention;

(2) FIG. 2 is a cross-sectional view taken on section plane 2-2 in FIG. 1;

(3) FIG. 3 is a perspective view of the cleaning device with the inner shaft retracted;

(4) FIG. 4 is an exploded perspective view of the cleaning device, showing the external shaft in two parts, the internal shaft with the chopping blade at one end thereof, and the manually engageable protrusion for unlocking, and for extending and retracting, the internal shaft;

(5) FIG. 5 is an enlarged fragmentary sectional view illustrating details of the mechanism by which the internal shaft is locked in its retracted position;

(6) FIG. 6 is an enlarged fragmentary perspective view illustrating details of the manually engageable protrusion;

(7) FIG. 7 is an enlarged fragmentary perspective view illustrating further details of the manually engageable protrusion;

(8) FIG. 8 is an enlarged fragmentary perspective view showing details of a shoulder structure for retaining the inner shaft in the retracted condition;

(9) FIG. 9 is a perspective view of the cleaning device with the inner shaft extended; and

(10) FIG. 10 is an enlarged perspective view illustrating the shoulder structure for retaining the inner shaft in an extended condition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(11) As shown in FIG. 1, the cleaning device 12 includes an elongated shaft 14 having a manually grippable handle 16 at a proximal end of the shaft. The handle is preferably molded as a unitary part of the shaft 14, but as an alternative, the handle can be a separately formed element, attached to the shaft 14 by suitable means, e.g., an adhesive, mating threads on the handle element and shaft, or a separate fastener. The external surface of the handle can be formed with an array of bumps as shown, or with other surface features designed to prevent the handle from slipping in the user's hand.

(12) The exterior of the intermediate part 18 of the shaft 14 preferably has a circular cross-section. The opposite, i.e., distal, end portion 20 of the shaft is preferably also formed as a unit with the intermediate part 18 of the shaft, and has a circular exterior cross-sectional shape, with a diameter larger than that of the intermediate part 18. Groups 22 of flexible bristles protrude from the distal end 20 forming a brush 24. Ends of bristles in each group are embedded in the enlarged distal end of the shaft, preferably in such a way that the bristles of the groups nearest the handle protrude in a generally radial direction relative to a longitudinal axis of the shaft, and, proceeding toward the distal end of the shaft, the direction of the bristles gradually approaches the direction of the longitudinal axis.

(13) The intermediate part of shaft 14, between the handle 16 and the brush 24, is formed with a longitudinally elongated slot 26 that extends from a location adjacent the handle to an intermediate location between the handle the brush. The slot accommodates a manually engageable protrusion 28, which is used to control the movement of a second shaft located, and slidable longitudinally, in an internal channel inside the shaft 14. The second shaft has a chopping blade formed at one of its ends.

(14) As shown in FIG. 2, the protrusion 28 is fixed to the second shaft 30 at a location at or near the proximal end of the second shaft, and the chopping blade 32 is formed at the distal end of shaft 30. In FIG. 2, the chopping blade is shown in its retracted condition in the internal channel 34 in the shaft 14. The internal channel 34 has an opening 36 at its distal end, allowing the shaft 30 to be extended beyond the distal end of the shaft 14 so that the chopping blade 32 can be moved beyond the brush 24.

(15) As shown in FIG. 2, some of the bristles that extend from the enlarged distal end portion 20 of the shaft 14 are positioned to come into contact with, and to clean, the chopping blade 32 when the chopping blade is moved reciprocally between the location in which it is depicted in FIG. 2 and an extended location as shown in FIG. 9.

(16) FIG. 3 shows the cleaning device in an assembled condition, and FIG. 4 shows the principal components in the same orientation as in FIG. 4, but in an exploded view. The handle 16 and shaft 14 are composed of similar parts, namely handle parts 16 and 16 and shaft parts 14 and 14, which are secured to each other in an assembly process either by a fusion process or by the use of a suitable adhesive. The second shaft 30 preferably has a generally rectangular cross-section, and the parts 14 and 14 of the first shaft 14 are shaped so that when they are brought together the internal channel 34 conforms to the cross-sectional shape of shaft 30, allowing shaft 30 to slide longitudinally but preventing rotation and lateral translational movement of shaft 30.

(17) As shown in FIG. 4, the chopping blade 32 is wider than shaft 30. The enlarged distal end portion 20 of the shaft 14 is formed in such a way that longitudinal slot-shaped openings are provided on opposite sides to accommodate the width of the chopping blade. One such opening, opening 33, is shown in FIG. 3.

(18) As shown in FIG. 5, protrusion 28 is secured to an extension 35 formed on the proximal end of shaft 30. The extension 35 includes a portion 36 that can extend through, or part of the way through, slot 26, and the protrusion 28 is secured to portion 36 by suitable means such as fusion or a suitable adhesive, and the connection of the protrusion 28 to portion 36 is preferably reinforced by the engagement of a tab 38 on portion 36 with a conforming depression on protrusion 28.

(19) As shown in FIGS. 2, 4 and 5, the part of shaft 30 near the proximal end is formed with a recess 40 which extends from the proximal end to an intermediate location 42. Because of the recess, a portion 44 of the shaft 30 adjacent the recess is narrower and more flexible than the lower part of shaft 30, and can be bent into the space formed by the recess by manually pushing on protrusion 28. Resilience of the shaft material causes the portion 44 to resume the shape depicted in FIG. 5 when pressure on the protrusion is released. The shafts can be molded from a variety of materials such as polyamide resins, polypropylene, or various polyester resins.

(20) FIG. 6 shows that the slot 26 is a space between two opposed longitudinally extending ribs 46 and 48, which are unitary parts of shaft part 14. Flexible portion 44 of shaft 30, which is wider than slot 26, is formed with a forwardly projecting locking tab 50, shown in FIG. 7. This locking tab extends across the width of flexible portion 44, and end portions of the locking tab are located so that they can engage shoulders 52 and 54 formed at the proximal ends of ribs 46 and 48 as shown in FIG. 8, thereby locking shaft 30 in the retracted position as depicted in FIGS. 3, 6 and 7. Locking tab 50 does not need to be continuous across the full width of portion 44, and alternative locking mechanisms can be used. For example, the locking tab can be composed of two parts, one engageable with shoulder 52 and the other engageable with shoulder 54.

(21) The engagement of the locking tab 50 with shoulders 52 and 54 can be released by pushing inward on protrusion 28, and shaft 30 can then be moved longitudinally to cause the chopping blade 32 to protrude as shown in FIG. 9. When the shaft 30 is in its protruded condition, the resilience of portion 44 will cause locking tab 50 to move into notches 56 and 58, shown in FIG. 10. These notches are formed in ribs 46 and 48 respectively. These notches are laterally opposed to each other, and located adjacent the distal ends of ribs 46 and 48. Engagement of tab 50 with shoulders 60 and 62 in the notches maintains the shaft 30 in its protruding condition until it is released by pushing inward on protrusion 28.

(22) A user can operate the cleaning device as a conventional brush, with the chopping blade retracted, and when the chopping blade 32 is needed to dislodge debris, it can be extended by manually grasping and pressing inward on protrusion 28, and then moving protrusion 28 in the distal direction until the shaft 30 is locked in its protruding position by engagement of tab 50 (FIG. 7) with the shoulders 60 and 62 in notches 56 and 58 (FIG. 10). Upon completion of the dislodgment of debris, the user can grasp and press inward on protrusion 28, thereby releasing the shaft 30 for movement in the proximal direction. Then, by moving protrusion 28 back and forth longitudinally through the range between the locations in which locking engagement takes place, the user can cause the bristles that protrude form the distal end of the shaft 14 to clean the blade 32.

(23) The cleaning device described and shown in the drawings is a currently preferred embodiment. Many modifications can be made to the device, however. For example, the internal shaft in which the chopping blade is a part can have a cross-sectional shape other than rectangular. The latching mechanism for holding the internal shaft in its retracted and protruding positions can include flexible elements that are secured to, but not unitary with, the internal shaft. Moreover, in an alternative version, it is possible for the manually operable protrusion that controls the position of the chopping blade to be unitary with the internal shaft. Numerous other modifications can, of course be made without departing from the scope of the invention.