FIELD OF THE INVENTION
The present invention relates to devices used to spin items centrifugally, and more particularly, to a pivotally-leveraged manual centrifugal drive such as for use in drying items such as leafy vegetables and other food items.
BACKGROUND OF THE INVENTION
U.S. Pat. Nos. 5,865,109 to Bull and 5,904,090 to Lillelund et al. disclose manually-driven centrifugal drying devices that are hand-cranked by a handle that is integrated with the lid. assembly and oriented for a direction of movement in a plane parallel with the lid assembly. U.S. Pat. No. 6,018,883 to Mulhauser discloses a manually-driven centrifugal drying device with a handle that is oriented for movement perpendicular to the lid assembly, but the mechanism does not provide leverage attain rapid movement of the spinner. U.S. Patent Application Publication No. 2006/0144257 to Cheng et. al. discloses a manually-driven centrifugal drying device with a pull-cord drive that generates leverage but is oriented for movement not perpendicular to the lid assembly.
SUMMARY OF THE INVENTION
A pivotally-leveraged manual centrifugal drive according to a preferred embodiment of the invention for use with a bowl and a basket formed to nest within the bowl comprises: a) a housing formed to mate with the bowl; b) a rotation wheel rotatably connected to the housing, formed to mate with the basket, and having a plane of rotation; c) a handle pivotally attached to the housing and oriented to move in a plane that is substantially perpendicular to the plane of rotation of the rotation wheel; and d) gears connecting the handle to the rotation wheel. The device may also include an automatic clutch that engages the rotation wheel only when the handle is moved in one direction. A further optional feature is a mechanism for decelerating the rotation wheel, which includes a disk having a diameter substantially smaller than the rotation wheel.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1-8
b depict an embodiment of the present invention of a pivotally-leveraged manual centrifugal drive for use with a bowl and basket nested within the bowl, wherein:
FIG. 1 is a top perspective view showing the handle locked down;
FIG. 2 is a top perspective view showing the handle partly extended upwardly;
FIG. 3 is a top perspective exploded view;
FIG. 4 is a bottom perspective partial cutaway view, particularly showing the braking mechanism;
FIGS. 5A and 5B are sectional side views, respectively showing the handle in the locked-down position and in a partly-extended position;
FIG. 6 is a sectional side view, showing a bowl and a basket mated with the pivotally-leveraged manual centrifugal drive.
FIG. 7 is a top perspective exploded view (from a different angle than FIG. 3) of the “drive-train.”
FIGS. 8A and 8B are top perspective close-up views of the gears, respectively showing the clutch cog in an engaged position and an unengaged position.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
FIGS. 1-8
b depict an embodiment of the present invention of a pivotally leveraged manual centrifugal drive 20 for use with a bowl 86 and basket 92 nested within the bowl so as to form a manually-driven centrifugal drying device 10. As shown in FIG. 6, the pivotally-leveraged manual centrifugal drive 20 mates with a bowl 86 having solid walls and a conical protuberance 90 at its bottom, upon which the basket 92 (which is perforated and nests within the bowl 86) can spin during use. The bowl 86 may also include an annular high-friction footing 88 at its base. As manually-driven centrifugal drying devices generally including a spinning basket nested within a bowl are well-known, the present. drawings and description are directed to the inventive pivotally-leveraged manual centrifugal drive 20 that spins the basket 92.
FIGS. 1 and 2 show a top perspective view of the pivotally-leveraged manual centrifugal drive 20, which primarily consists of a generally flat housing 21 and a handle 24 pivotally attached to the pivotally-leveraged manual centrifugal drive 20. A locking button 30 slides forward and backward on the handle 24 and includes a protruding pin (not shown) that inserts (when the handle 24 is in the down position as shown in FIG. 1 and the button 30 is moved forward) in a corresponding notch in the abutment 94, so as to lock the handle in the down position shown in FIG. 1. In the preferred embodiment, the handle can pivot further upwardly than shown in FIG. 2, such as to approximately a 90 degree angle with the housing 21. The pivotally-leveraged manual centrifugal drive 20 also includes a brake button 26, further described below. As best seen in FIGS. 3 and 7, the handle 24 is biased toward the fully upwardly pivoted position by a spring 34. (The straight end of the spring 34 is engaged within a corresponding hole in the cylindrical opening in the end of the handle 24 while the longer, curved end is retained on a screw 40 along with a ring 42). The handle 24 pivots on a shaft 38 (which is affixed at each end within corresponding holes formed in stanchion 43 and dome 45, with a bushing 84 placed on the shaft 38 to bear the central portion of spring 34), and a spring 34 urges the handle 24 upwardly so that as soon as a user stops pushing the handle 24 downwardly towards the pivotally-leveraged manual centrifugal drive 20, the handle 24 pivots upwardly back to an extended position. Rotation wheel 58 is driver un-directionally by manual operation of the handle 24, and its fins 100 engage the basket 92 so that it rotates within the bowl 86. (Fins 102 are adapted to engage an optional, smaller-diameter “berry basket”—not shown—that can be nested within the basket. 92).
With particular reference to FIGS. 3-5B and 7, the transfer of force from manual operation of the handle 24 into the rotation wheel 58 is described. The teeth 25 at the pinion end 82 of the handle 24 (see FIGS. 5A and 5B), which are engaged with the teeth. 78 of a rack 72, drive the rack 72 (which is free to slide on tracks 77 until hitting an abutment 79) in the direction away from axle 51 when the handle 24 is pushed downwardly toward the position shown in FIG. 5A. As seen in FIGS. 3 and 7, teeth 73 of the rack 72 engage (through aperture 75 in dome 45) pinion 70, which is fixedly attached to a drive wheel 68 and is stabilized on an axle 62 (which is received. in a corresponding hole in the top interior of gear housing 74 such that the axle 62 can rotate within the hole). (Housing closure 60 is fixedly attached to housing 21 such as by locating pegs 106 in guide holes 96 and screws (not shown) in guides 98 and internally--threaded stanchions 104, and gear housing 74 is in turn fixedly attached to housing closure 60 such as by screws and stanchions). Thus downward and upward pivoting of the handle 24 produce forward and backward motion of the rack 72, producing resulting clockwise and counterclockwise rotation of the drive wheel 68. Clutch cog 44 clutches gear 50 only when drive wheel 68 is rotated clockwise as viewed in FIGS. 7-8B, however, because the ends of its axle are free to move within a slightly arcuate path 108 defined in housing closure 60 (and a corresponding slightly arcuate path defined in the opposing portion of the gear housing 74, the reverse outline of which is visible on the other side of gear housing 74 in FIGS. 3 and 7). Counterclockwise rotation of drive wheel 68 urges clutch cog 44 along slightly arcuate path 108 in the direction away from gear 50 and axle 51, and clockwise rotation urges it toward gear 50. As shown in FIG. 8B, when clutch cog 44 is clutching gear 50 (i.e., during clockwise rotation of the drive wheel 68 as viewed in FIGS. 7-8B), the “drive-train” shown in FIG. 7 is fully connected and produces leveraged revolution of gear 50 and rotation wheel 58 to which axle 51 is fixedly attached by endcap 56 (with a bushing 46 provided between the axle 51 and housing closure 60). As shown in FIG. 8A, when clutch cog 44 is not clutching gear 50 (i.e., during and after counterclockwise rotation of the drive wheel 68 as viewed in FIGS. 7-8B), the “drive-train” shown in FIG. 7 is not connected such that rotation wheel 58 (to which axle 51 is fixedly attached) is therefore free to spin irrespective of the motion of the rest of the drive-train and gears. Preferably for added stability (not shown), instead of a single drive gear 68, a symmetric, counter-rotating double-drive gear may be used, each having a pinion driven by teeth on opposing sides of a wider rack. One of ordinary skill also of course will recognize that a variety of other suitable mechanisms known in the art readily could be adapted as an alternative means of transferring the pivotal motion of the handle 24 into rotation of rotation wheel 58.
In a further optional feature, a brake means including a brake disk 54 can be employed to indirectly decelerate the rotation wheel 58. In the embodiment shown in the Figures, the brake disk 54 includes a high-friction tire 52 and is indirectly fixedly attached to the rotation wheel 58 (e.g., by endcap 56 screwed onto axle 51 or other suitable means such as a snap-lock). The tire 52 is slowed when the ram 64 impinges upon it. The ram 64 is biased against contact with the tire 52 by a spring 48, and is activated by manual pressure on the brake button 26. Manual pressure on the brake button 26 plunges a rod 36 downwardly against the bias of the spring 76, moving a wedge 66 downwardly. Downward movement of the wedge 66 forces the complementary wedge-shaped face on the ram 64 to drive the other end of the ram 64 into contact with the tire 52, slowing the disk 54, and thus the axle 51, and thus the rotation wheel 58.
It is noted that the majority of the parts of the described embodiment of a pivotally-leveraged manual centrifugal drive preferably can be made of plastics that are suitably hard, strong, and durable, with only limited parts (such as the axle 62, gear 50, teeth 73, screws, springs, etc.) being optionally or preferably made of metals such as steel and/or zinc.
Although the present invention has been described in detail in the context of a preferred embodiment of a pivotally-leveraged manual centrifugal drive for use with a nested basket and bowl so as to form a manually-driven centrifugal drying device, one skilled in the art will appreciate that numerous variations, modifications, and other applications are also within the scope of the present invention. Thus, the foregoing detailed description is not intended to limit the invention in any way, which is limited only by the following claims and the legal equivalents.
Patent Application
20140130364
