Patent Application
20050188671
Not Applicable.
Not Applicable
Not Applicable
The present invention generally relates to rakes and, more particularly, to lawn rakes having resiliently flexible tines.
Rakes are typically suitable for a particular purpose depending on the length, spacing and/or flexibility of its tines or teeth. For example, it is desirable to have a leaf rake with relatively flexible teeth to provide light raking when removing leaves or other yard debris from flower beds or young grassy areas to avoid injuring flowers, young grass, and the like. Additionally, it is desirable to have a leaf rake with somewhat stiffer teeth to provide medium raking when removing dry leaves or other yard debris from lawns. Furthermore, it is desirable to have a leaf rake with relatively stiff teeth to provide heavy raking when removing wet leaves and other yard debris from lawns. This requires a homeowner to have several different types of rakes just to remove leaves in additional to the different types of rakes required to perform other tasks.
Prior attempts have been made to reduce the number of rakes needed to perform various tasks. For example, U.S. Pat. Nos. 1,785,320, 1,904,843, and 4,150,528 disclose rakes having teeth with adjustable lengths, the disclosures of which is expressly incorporated herein in its entirety by reference. The teeth of the '320 patent are secured to a plate and move in unison relative to a header of the rake to adjust the active length of the teeth. The length is adjusted to change the effective flexibility of the teeth so that the rake can be used in light duty applications in a flower bed or heavy duty application like raking gravel. The small length of the teeth when the teeth are relatively stiff, however, is not desirable for applications like raking wet leaves on a lawn.
U.S. Pat. No. 5,626,009 discloses a rake having tines with adjustable spacing, the disclosure of which is expressly incorporated herein in its entirety by reference. A sliding head is moved along the tines adjust the spacing between the tines. The spacing is adjusted so that the rake can be used to rake large items like leaves or small items like gravel or dirt. The reduced spacing between the tines when the tines are relatively stiff, however, is not desirable for applications like raking wet leaves on a lawn.
Thus, while these prior attempts to provide multi-purpose rakes have provided adjustable rakes which are adequate to rake various kinds of items or materials, no adjustable rake has been provided which adequately rakes leaves under all kinds of conditions regardless of whether they are wet or dry. Accordingly, there is a need in the art for an improved leaf rake.
The present invention provides a rake which overcomes at least some of the above-noted problems of the related art. According to the present invention, a rake comprises, in combination, a head, an elongate handle extending from the head, and a plurality of parallel, spaced-apart, flexible tines extending from the head opposite the handle. A brace is movable along the tines between first and second positions to change the effective stiffness of the flexible tines. A locking device releasably secures the brace to the head in the first and second positions. Spacing between the tines remains unchanged as the brace moves between the first and second positions.
According to another aspect of the present invention, a rake comprises, in combination a head, an elongate handle extending from the head, and a plurality of spaced-apart, flexible tines extending from the head opposite the handle. The handle extends to the tines.
According to yet another aspect of the present invention, a rake comprises, in combination, a head, an elongate handle extending from the head, and a plurality of parallel, spaced-apart, flexible tines extending from the head opposite the handle. A brace is movable along the tines between first and second positions to change the effective stiffness of the flexible tines. A locking device releasably secures the brace to the head in the first and second positions and at locations between the first and second positions. Spacing between the tines remains unchanged as the brace moves between the first and second positions. The handle extends to the tines.
From the foregoing disclosure and the following more detailed description of various preferred embodiments it will be apparent to those skilled in the art that the present invention provides a significant advance in the technology of adjustable rakes. Particularly significant in this regard is the potential the invention affords for providing a high quality, reliable, simple, and easily adjusted assembly with improved operational performance. Additional features and advantages of various preferred embodiments will be better understood in view of the detailed description provided below.
These and further features of the present invention will be apparent with reference to the following description and drawings, wherein:
It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various preferred features illustrative of the basic principles of the invention. The specific design features of the rakes as disclosed herein, including, for example, specific dimensions, orientations, and shapes of the various components will be determined in part by the particular intended application and use environment. Certain features of the illustrated embodiments have been enlarged or distorted relative to others to facilitate visualization and clear understanding. In particular, thin features may be thickened, for example, for clarity or illustration. All references to direction and position, unless otherwise indicated, refer to the orientation of the rake illustrated in the drawings. In general, up or upward refers to an upward direction in
It will be apparent to those skilled in the art, that is, to those who have knowledge or experience in this area of technology, that many uses and design variations are possible for the improved rakes disclosed herein. The following detailed discussion of various alternative and preferred embodiments will illustrate the general principles of the invention with reference to a leaf rake for applications in residential or commercial environments. Other embodiments suitable for other applications will be apparent to those skilled in the art given the benefit of this disclosure.
Referring now to the drawings, FIGS. 1 to 5 illustrate an adjustable-tine leaf rake 10 according to a preferred embodiment of the present invention which can be easily adjusted between a relatively flexible configuration for raking dry leaves, a relatively stiff configuration for raking wet leaves, and a plurality of configurations therebetween. The illustrated leaf rake 10 includes a head 12, an elongate handle 14 extending from the head 12, a plurality of flexible tines 16 extending from the head 12 opposite the handle 14, a movable brace 18 movable along the tines 16 to effective change stiffness of the flexible tines 16, and a locking device 20 releasably securing the movable brace 18 to the head 12 in desired positions along the tines 16.
The illustrated head 12 has a cylindrically shaped support 22 at its upper end and laterally expands in an arcuate manner. The support 22 has a vertically extending passage therethrough that forms a central axis 24 for the rake 10. The lower end of the head 12 forms a concave edge 26 from which the flexible tines 16 extend. Located below the concave edge 26 an at the tines 16 is a vertically extending socket 28 having an open upper end and a closed lower end. The socket 28 is spaced below the support 22 and coaxial therewith. The support 22 and the socket 28 are sized and shaped to cooperate with and receive the handle 14 as described in more detail hereinbelow.
A central portion of the illustrated head 12 forms a generally planar portion or surface 30 having a vertically extending slot 32 for cooperation with the locking device 20 as described in more detail hereinbelow. As best shown in
The central portion of the lower edge 26, at the planar surface 30, is also provided with a slot or opening 36 sized and shaped to cooperate with the movable brace 18 as described in more detail hereinbelow. The illustrated head 12 also includes a plurality of ribs 38 for stiffening the head 12 so that it can be of light weight and low profile construction. The illustrated ribs 38 are located on each lateral side of the planar surface 30 of the central portion and are generally horizontal, vertically spaced apart and laterally extending. Openings 40 are preferably provided between the ribs 38 to reduce the weight of the head.
The head 12 is preferably molded of a suitable plastic material so that it is of unitary construction. It is noted, however, that the head 12 can alternatively be formed of other suitable materials and/or can be formed of separate components secured together.
The handle 14 is suitable sized and shaped for a user to manually operate the rake 10. The handle 14 can be shaped in any desired manner such as for example, straight or curved in an ergonomic manner. The handle 14 is preferably elongate and rigid. The illustrated handle 14 is circular in cross section but any other suitable shape alternatively can be utilized. The handle 14 can be formed of any suitable material such as, for example, wood, plastic, fiberglass, or metal.
The illustrated handle 14 downwardly extends through the support 22 and into the socket 28 along the central axis 24. The handle 14 is preferably secured to the head 12 in a suitable manner such as the illustrated mechanical fasteners 42 at the support 22 and the socket 28. It is noted that other suitable means for fastening can alternatively be utilized such as, for example, welding, adhesives, locks and clips. The handle 14 preferably extends entirely past the head 12 to the tines 16 so that the handle 14 provides rigidity to the head 12. Constructed in this manner, the head 12 can be advantageously formed in a lightweight and low profile manner.
The plurality flexible tines 16 downwardly extend from the concave lower edge 26 of the head 12 in a cantilever manner so that they have free lower ends and secured upper ends. The plurality of tines 16 are elongate, parallel and laterally spaced apart. The illustrated tines 16 each have a generally planar front surface 44 and a rearwardly disposed rib 46 that extends along the length of the tines 16 so that the tines 16 are generally T-shaped in cross section. The ribs 46 of the outer most tines 16, however, are located at the outer lateral edge of the tines 16 so that the tines are generally L-shaped in cross-section. It is noted that the tines 16 can alternatively have any suitable shape within the scope of the present invention. The rake 10 can be provided with any suitable quantity of the tines 16. The illustrated tines are provided with a laterally extending fixed brace spaced below the edge 26 and along the length of the tines 16. It is noted that the fixed brace 48 can be eliminated in embodiments where the head 12 and/or the tines 16 have desired stiffness/flexibility.
The tines 16 are preferably molded of plastic but alternatively can be formed of any other suitable material such as, for example, metal. The tines 16 are also preferably molded of unitary construction with the head 12 but alternatively can be separate and secured to the head 12. Therefore, for example, the tines 16 can be plastic and molded unitary with the plastic head 12 or the tines 16 can be metal and secured to the plastic head 12.
The movable brace 18 has a lower portion sized and shaped to interface with the tines 16 and an upper portion sized and shaped to interface with the head 12 and the locking device 20 as described in more detail hereinbelow. The lower portion laterally extends generally perpendicular to the tines 16 and is provided with a plurality of openings 50 therein for passage of the tines 16 through the lower portion. The illustrated movable brace 18 includes a separate one of the openings 50 for each of the tines 16. The openings 50 are preferably sized and shaped to cooperate with the tines 16. The illustrated openings 50 are generally T-shaped.
The upper portion extends upwardly from the lower portion of the movable brace 18 and has a generally planar portion 52 which extends through the opening 36 in the head 12 and is disposed between the planar portion 30 of the head 12 and the handle 14. The illustrated planar portion 52 is provided with an opening 54 for cooperation with the locking device 20. As best shown in
The locking device 20 is provided to selectively and releasably secure the movable brace 18 in a desired position by securely engaging the protrusions 34, 56. The locking device 20 can be of any suitable type within the scope of the present invention. The illustrated locking device 20 includes a knob 58 located forward of the head slot 32 and extends through the head slot 32 and the brace opening 54 to a cam lock. Constructed in this manner, rotation of the knob 58 brings the protrusions 34, 56 into and out of engagement to lock and unlock the movable brace 18 to the head 12. Preferably, the locking device 20 is locked and unlocked by about ninety degree rotation of the knob 58. It is noted that any suitable type of locking device can be utilized within the scope of the present invention. It is also noted that the locking device can alternatively lock the movable brace 18 directly to the tines 16.
In use, the movable brace 18 can be selectively moved between a first or full up position, near the fixed brace 48, and a second or full down position, near the free end of the tines 16, to adjust the effective length of the tines 16 to limit the range of motion of the tines 16 and therefore the effective stiffness an/or flexibility of the tines 16. The movable brace 18 ties the tines 16 together so that movement of the movable brace 18 along the tines 16 changes the effective length of the tines 16. It should be appreciated that the tines 16 become effectively more stiff or less flexible as the movable brace 18 is located closer to the lower or free ends of the tines 16 and become effectively more flexible or less stiff as the movable brace 18 is located closed to the upper or secured ends of the tines 16. As the movable brace 18 moves along the length of the tines 16, the lateral-spacing of the tines 16 is not changed so that the tines 16 remain in a desired or optimized spaced for raking leaves. To make an adjustment, the user turns the knob 58 to unlock the locking device 20 such that the protrusions 34, 56 are not interlocked. Once unlocked, the user slides the movable brace 18 to the desired new position and the user turns the knob 58 to again lock the locking device 20 and interlock the protrusions 34, 56. The illustrated movable brace 18 can be locked at a plurality of positions between the full up and down positions. It is noted that the number of “lockable” positions can be increased or decreased depending on the construction of the protrusions 34, 56. It is also noted that the movable brace 18 can be constructed with infinite adjustment if desired.
From the foregoing disclosure and detailed description of certain preferred embodiments, it will be apparent that various modifications, additions and other alternative embodiments are possible without departing from the true scope and spirit of the present invention. The embodiments discussed were chosen and described to provide the best illustration of the principles of the present invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the present invention as determined by the appended claims when interpreted in accordance with the benefit to which they are fairly, legally, and equitably entitled.
