Suction head for sediment dredge

Dredge heads, for use with a dredging system, include one or more movable members, e.g. grate members, adapted and configured to selectively extend across the opening of the dredge head. The movable member(s) enables a user to clear the dredge head of plugging masses or blockages without having to de-energize the dredge system pump. Also, the movable member(s) enable a user to clear the dredge head of plugging masses or blockages without requiring the user to manually, by using his or her hand, withdraw the plugging masses or blockages from the opening of the suction/dredge heads.

BACKGROUND

The present invention relates generally to sediment removal systems which are used in environmental clean-up of sediment in bodies of water such as lakes, ponds, rivers, etc. In particular, the present invention relates to apparatus located at terminal ends of such sediment removal systems, e.g. suction heads or dredge heads.

In general, sediment removal systems use suction pumps connected to suction heads or dredge heads by pipes, which are typically flexible hoses or other flexible, hollow, conduit-type members. SCUBA or other underwater divers can go underwater and manually move the suction/dredge heads about the bottom of the body of water, visually determining what material needs to be removed.

In order to remove sediment, the suction head is placed close enough to the sediment that the vacuum or suction force of the system draws the sediment into the and through the suction/dredge head, and into and through the connecting lines of hose.

As the sediment is drawn into the sediment removal system, the system vacuum force is not selective in drawing material into the suction/dredge head, and thence through the hoses. Thus, a certain amount of unwanted material is drawn into the sediment removal system along with the sediment which is desiredly being removed. The unwanted material can include stones and rocks, as well as a certain amount of organic vegetation.

Sediment removal systems are typically designed to remove smaller-size particles, such as sand, silt, sludge, muck, and the like, and so the equipment is designed to handle such smaller size particles. In the interest of efficiency of the system in handling such smaller size particles, the system is not designed primarily to handle larger stones and rocks. Thus, when a larger stone or rock gets into the system, the system can be damaged by the larger stone or rock. For example, a stone or rock can damage the impellers in a pump so that the efficacy of the pump is negated or severely degraded. Accordingly, certain steps have been taken to protect the moving parts of the system.

As one example, various filtering mechanisms have been employed, which are placed between the suction/dredge head and the pump. However, on occasion, various stones, rocks, and other relatively larger non-desired pieces of debris become lodged elsewhere in the system, such as in the hose between the filter and the suction/dredge head or at the dredge head opening.

Accordingly, efforts have been made to provide a filter mechanism at the suction/dredge head. Typical suction/dredge head filter mechanisms include one or more bars or a screen which is fixedly attached to the suction/dredge head. And one known suction/dredge head uses a hinged bar that covers part of the opening into the suction/dredge head.

However, all such previous filter mechanisms at the suction/dredge head have proved inadequate. The filter mechanisms, which include fixed bars or screens, plug with various particles and objects, whereby the user has to, with his or her hand, pull such particles and objects out of or away from the fixed bars or screens. Since the suction power generated by the pump can be substantial, the user, for safety and/or other reasons, must first de-energize the pump prior to removing the plugged particles and objects from the suction/dredge head.

The filter mechanisms which include a hinged bar have proven inadequate for the intended purpose of use for numerous reasons. As one example, the bar hingedly travels only a relatively short distance, whereby when hinged fully open, portions of the bar are relatively further from the opening of the suction/dredge head, yet the bar continues to extend over a column projected from the opening. Accordingly, when the bar is hingedly opened, and particles or objects communicating with the bar remain substantially in-line with the pull of the vacuum, whereby when the bar is hingedly opened, the particles or objects can of roll, slide, or otherwise deflect off the bar, into the path of vacuum pull, thence non-desiredly into and through the suction/dredge head.

As another example, filter mechanisms which include a hinged bar have proven inadequate because the hinged connection between the bar and the suction/dredge head is substantially loose which provides a substantial amount of free-play at the bar. Accordingly, the bar easily flops, droops, sags, hangs down, wobbles, and or otherwise non-desiredly freely moves. Because of this loose connection, the bar is easily displaced from the desired location across the opening of the suction/dredge head.

When the bar is at an extreme positions of displacement, the bar extend across a minor portion or very little of the opening, whereby the effective size of the opening, e.g. the largest unobstructed portion of the opening, remains sufficiently close to that of the opening without the bar extending there across, such that various non-desired particles and objects can still pass through the opening, into and through the suction/dredge head, and non-desiredly into various other portions of the system. In other words, when the bar is at an extreme position of displacement, the integrity of the filtering function provided by the bar is largely, and sometimes wholly, compromised, whereby the hinged bar substantially fails to provide the desired mechanical protection for the system.

Accordingly, it might prove desirable and/or beneficial to provide suction/dredge heads which can be cleared of plugging masses or blockages without having to de-energize the corresponding system pump.

It might prove beneficial to provide suction/dredge heads which include one or more movable members adapted and configured to clear plugging masses or blockages from the opening of the suction/dredge heads, without requiring the user to manually withdraw the plugging masses or blockages from the opening of the suction/dredge heads by using his or her hand.

It might prove beneficial to provide suction/dredge heads which include one or more movable members adapted and configured to clear plugging masses or blockages from the opening of the suction/dredge heads which are sufficiently stable so as to remain substantially static when the one or more movably members extends across the opening of the suction/dredge head, during use.

SUMMARY

The invention generally provides dredge heads, for use with a dredging system, which include one or more movable members, e.g. grate members, adapted and configured to selectively extend across the opening of the dredge head, as desired by a user. The movable member(s) enables a user to clear the dredge head of plugging masses or blockages without having to de-energize the dredge system pump. Also, the movable member(s) enable a user to clear the dredge head of plugging masses or blockages without requiring the user to manually withdraw the plugging masses or blockages from the opening of the suction/dredge heads by using his or her hand.

In a first family of embodiments, the invention comprehends a dredge head comprising: (a) a blade having a forward facing surface, a rearward facing surface, a thickness dimension, and an opening which extends through the thickness of the blade and defines a blade opening width dimension; (b) a header tube having a forward facing end, a rearward facing end, and an opening which extends axially between the forward and reward facing ends, through the header tube, the forward facing end of the header tube interfacing with the rearward facing end of the blade and the header tube opening and the blade opening generally coaxially aligned with each other; (c) a grate selectably extending across the blade opening and having an upper grate prong and a lower grate prong, the upper and lower grate prongs spaced from each other and defining an elongate slot therebetween, the grate movable between first and second positions, the grate in such first grate position extending across and communicating with the blade opening and the grate in such second grate position not extending across and communicating with the blade opening; and (d) an articulatable member movable between first and second positions and operably connected to the grate, the articulatable member in such first position corresponding to the grate in such first grate position and the articulatable member is such second position corresponding to the grate in such second grate position.

In some embodiments, the grate elongate slot defines a slot opening width dimension corresponding to the distance between the upper grate prong and a lower grate prong and a slot opening length dimension corresponding to the length dimension of ones of the upper grate prong and a lower grate prong, the magnitude of such slot length dimension greater than the magnitude of such slot width dimension.

In some embodiments, the grate is removably attached to ones of the blade and the head tube.

In some embodiments, the grate is generally planar.

In some embodiments, the grate is generally arcuate.

In some embodiments, the grate in such first grate position generally defines at least three openings which extend into the header tube opening.

In some embodiments, two of the at least three openings are generally hemispherical shaped openings and one of the at least three openings is a generally rectangular shaped opening.

In some embodiments, two of the at least three openings are generally crescent shaped openings and one of the at least three openings is a generally elliptical shaped opening.

In some embodiments, the dredge head is part of a dredging system.

In a second family of embodiments, the invention comprehends a dredge head comprising: (a) a blade having a forward facing surface a rearward facing surface, a thickness dimension, and an opening which extends through the thickness of the blade and defines a blade opening width dimension; (b) a header tube having a forward facing end, a rearward facing end, and an opening which extends axially between the forward and reward facing ends, through the header tube, the forward facing end of the header tube interfacing with the rearward facing end of the blade and the header tube opening and the blade opening generally coaxially aligned with each other; and (c) a grate pivotably attached to ones of the blade and the header tube, the grate pivotably movable between first and second positions, the grate in such first grate position extending across the blade opening and the grate in such second grate position not extending across the blade opening, the grate pivotable about an axis of pivotation which is generally displaced from the blade.

In some embodiments, the axis of pivotation is displaced outwardly from the blade forward facing surface, with the blade forward facing surface facing the axis of pivotation.

In some embodiments, the axis of pivotation displaced outwardly from the blade, with the blade rearward facing surface facing the axis of pivotation.

In some embodiments, the axis of pivotation is a generally vertical axis of pivotation.

In some embodiments, the axis of pivotation is generally perpendicular to an axis which extends through the length of the header tube bore.

In a third family of embodiments, the invention comprehends a dredge head comprising: (a) a blade having a forward facing surface a rearward facing surface, a thickness dimension, and an opening which extends through the thickness of the blade and defines a blade opening width dimension; (b) a header tube having a forward facing end, a rearward facing end, and an opening which extends. axially through the header tube, the header tube forward facing end interfacing the rearward facing surface of the blade, the header tube having a first lateral surface and a second lateral surface; and (c) an elongate grate having an end and pivotably attached to ones of the blade and the header tube, adjacent the first header tube lateral surface, the grate pivotably movable between first and second positions wherein when the grate is in such first grate position, the end of the grate positioned laterally beyond a straight-line projected from the second header tube lateral surface; and when the grate is in such second grate position, the end of the grate positioned generally between a straight-line projected from the first header tube lateral surface and a straight-line projected from the second header tube lateral surface.

In some embodiments, when the grate is in such second grate position, the end of the grate positioned generally between a straight-line projected from the first header tube lateral surface and a straight-line projected from the second header tube lateral surface and proximate the first header tube lateral surface.

In a fourth family of embodiments the invention comprehends a dredge head comprising: (a) a blade having a forward facing surface a rearward facing surface, a thickness dimension, and an opening which extends through the thickness of the blade; (b) a header tube attached to the blade and having a forward facing end, a rearward facing end, and an opening which extends axially through the header tube, the forward facing end of the header tube proximate the blade and the rearward facing end of the header tube distal the blade; and (c) a grate pivotably attached to ones of the blade and the header tube, the grate pivotably movable between first and second positions, the grate in such first grate position proximate the blade opening and the grate in such second grate distal the blade opening, the grate pivotable about an axis of pivotation and along an angle of pivotation having a magnitude of greater than about 50 degrees of pivoting travel.

In some embodiments, the grate is pivotable about an axis of pivotation and along an angle of pivotation having a magnitude of greater than about 60 degrees of pivoting travel.

In some embodiments, the grate is pivotable about an axis of pivotation and along an angle of pivotation having a magnitude of greater than about 70 degrees of pivoting travel.

In some embodiments, the grate is pivotable about an axis of pivotation and along an angle of pivotation having a magnitude of greater than about 80 degrees of pivoting travel.

In some embodiments, the grate comprising a first elongate prong and a second elongate prong, the first and second prongs defining a void therebetween.

In some embodiments, the grate is removably attached to ones of the blade and the header tube.

The invention is not limited in its application to the details of construction or the arrangement of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments or of being practiced or carried out in other various ways. Also, it is to be understood that the terminology and phraseology employed herein is for purpose of description and illustration and should not be regarded as limiting. Like reference numerals are used to indicate like components.

DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

FIG. 1shows a dredging system, i.e. dredging system10, which includes pump12, gravity filter14, Y-connector16, one or more dredge heads18, and various hoses such as hoses20,22,24A,24B. Dredging system10is adapted and configured to remove various materials e.g. muck, sludge, sediment, biomass, mud, and/or other non-desired materials, from the bottom surface of ponds, streams, lakes and/or other bodies of water.

Pump12includes a prime mover such an internal combustion engine or an electric motor, and a suction generating mechanism. The prime mover provides power to the suction generating mechanism which correspondingly creates suction power, whereby pump12provides the suction energy utilized by dredging system10.

Preferably, pump12is adapted and configured to move a volume of at least about 36-thousand gallons of liquid per hour. Although the particular pump12is selected so as to provide suitable suction or vacuum and move a sufficient volume of liquid, be it more or less, based on the intended use environment of dredging system10.

Gravity filter14functions to remove larger pieces of material from the stream of material being removed from the sediment bed of the body of water. The water-borne sediment stream enters filter14at the bottom of the filter canister, and effluent exits the filter at the top of the canister. The design is such that the heavier sediment particles/stones, rocks, fall out of the sediment stream and settle to the bottom of the canister. AlthoughFIG. 1illustrates a gravity filter, those skilled in the art are well aware of other suitable filtration mechanisms, such as, but not limited to, various other flow-through filters and/or others.

Pump12is connected to filter14by hose20. Gravity filter14is connected to Y-connector16by hose22. Y-connector16has one connector inlet member and two connector outlet members. In other words, Y-connector16splits the system suction power into two separate divergent paths, generally defined by and transmitted through the two connector outlet members and correspondingly through hoses24A and24B.

Hoses24A,24B extend between and connect ones of the two outlets of Y-connector16and respective ones of dredge head18. In embodiments which utilize two dredge heads18, such as that illustrated inFIG. 1, dredge system10enables two users to simultaneously work together, each using a separate dredge head18, at locations proximate each other, whereby the divers can watch out for each other, and can both be gainfully employed in sediment removal.

Referring now toFIG. 2, in general, suction heads, e.g. dredge heads18of the invention each includes blade100, header tube150, actuation mechanism180, and actuatable arm200. The entire assemblage of dredge head18is adapted and configured for relatively easy manipulation by a user, and to provide a means of attenuating the rate of entrance of non-desired debris into dredging system10through dredge head18. Dredge head18further enables a user to, as desired, remove, clear, eliminate, and/or otherwise purge debris from the dredge head, generally without requiring the user to remove such debris with his or her hand.

Blade100is a plow or clip which generally defines the front portion of dredge head18which, as illustrated, has a length dimension which generally defines the overall width of dredge head18, and is generally arcuate in profile. In other words, blade100defines a generally arcuate wall, first and second generally open end or side portions and a generally open front-most portion. The blade100is adapted and configured to contact and traverse surfaces such as bottom surfaces of bodies of water, and/or to contact, push, drag, cut through, agitate, and/or otherwise communicate or interface with substances and particles which are to be removed by dredging system10.

Blade100includes inner and outer surfaces, namely, surfaces102and105, respectfully. If the arcuate wall of blade100was arcingly projected to define a cylinder having generally the same radius as the radius of blade100, inner surface102would generally define the inner circumferential surface of such cylinder and outer surface105would generally define the outer circumferential surface of such cylinder. Namely, inner surface102faces generally forward, away from the remainder of dredge head18whilst outer surface105, at least a rearwardly facing portion thereof, faces generally rearward, toward the remainder of dredge head18.

Referring now toFIG. 4, at least one opening or aperture extends generally medially through blade100, e.g. though the entire thickness thereof. The particular shape e.g. outside perimeter shape is selected so as to provide an aperture of desired opening dimensions and overall configuration. Exemplary of such suitable shapes, dimensions, and configurations, are round and oval which correspond to round aperture “RA” and oval aperture “OA” which are illustrated in dashed and solid lines, respectively.

Channel opening “CO” also extends through the entire thickness of blade100, proximate round aperture “RA” or oval aperture “OA.” One end of channel opening “CO” opens and extends into the round or oval aperture “RA,” “OA.” In other words, the round or oval aperture “RA,” “OA” and channel opening “CO,” in combination, define an opening with at least first and second portions, one opening portion which generally defines an oval or circle and another portion which is generally elongate and extends from such oval or circular e.g. round opening.

Referring now toFIGS. 2,3,4, and5, upper and lower leading edges110and115, respectively, define the terminal edge surfaces at the forward-most portion of blade100, whereby the wall which extends between upper leading edge110and lower leading edge115arcingly extends therebetween and generally defines a C-shaped profile when viewed from the side.

Referring now specifically toFIG. 5, when viewed in side elevation, from the left side of dredge head18, the contour and profile of blade100defines a generally reverse-C profile configuration. Axis “A”, viewed in end view inFIG. 5, extends axially through the cavity within blade100, along the length thereof. In embodiments with a generally constant radius of blade100, axis A is generally radially displaced the same distance from ones of any given points along the inner circumferential surface of blade100e.g. inner surface102.

Upper edge110and lower edge115extend generally parallel to each other and are each displaced from an imaginary straight-line which extends through axis “A”, generally perpendicular to header tube150. Namely, upper edge110and lower edge115lie on generally different sides of such imaginary straight line, whereby the distance between such line and upper edge110defines a first, upper distance “UD” and the distance between such line and lower edge115defines a second, lower distance “LD.”

The magnitude of upper distance “UD” is at least about twice the magnitude of the lower distance “LD”. The overall distance between upper edge110and lower edge115, as measured generally parallel to header tube150, corresponds to the sum of the upper and lower distances “UD” and “LD” and generally defines the upper-lower distance “ULD.”

Although blade100is illustrated as defining an arcuate wall with a generally uniform radius and generally straight lines leading edges, other suitable configurations are contemplated and well within the scope of the invention. Such other suitable configurations include, but are not limited to, blades which are generally angular in profile, blades which have generally non-planar appearances when viewed from above e.g. V-shaped as viewed from above, and/or others.

Upper edge110and lower edge115each has a length dimension which corresponds to the overall width dimension of blade100. The magnitude of the length dimension of blade100is selected based at least in part on the particular intended use environment of dredge head18, and/or based on other factors. Exemplary of suitably width dimensions of blade100include width dimensions having magnitudes of at least about 4 inches, at least about 4½ inches, at least about 5 inches, at least about 5½ inches, at least about 6 inches, at least about 6½ inches, at least about 7 inches, at least about 7½ inches, at least about 8 inches, and others.

The magnitude of the overall height dimension of blade100, which corresponds to the distance between upper and lower edges110,115, includes any of a variety of suitable height dimensions, e.g. height dimensions having magnitudes of at least about 3 inches, at least about 3½ inches, at least about 4 inches, at least about 4½ inches, at least about 5 inches, at least about 5½ inches, at least about 6 inches, at least about 6½ inches, at least about 7 inches, and others.

The generally arcuate wall of blade100has a radius, or one or more radiused portions thereof, which provide blade100with a profile and thus scooping, pushing, plowing, digging, and/or other characteristics and functions which are suitable for the intended use environment. Namely, the generally arcuate wall of blade100defines a radius, or radiused portions thereof, of at least about 1½ inch, 2 inches, 2½ inches, 3 inches, and others.

Referring now toFIGS. 2 and 3, thumb tab “T” is an elongate projection with a length, a width, and a thickness dimension, and further defines an upper and lower surface thereof. Thumb tab “T” is adapted and configured to support, interface with, and/or otherwise cooperate with, a thumb or finger of a user, as desired.

The lower surface of thumb tab “T” communicates with an upper portion of outer surface105, whereby the remainder of thumb tab “T” extends upwardly therefrom. Accordingly, the thickness dimension of thumb tab “T” corresponds generally to the distance which thumb tab “T” extends from outer surface105, e.g. the magnitude of the distance between outer surface105and the upper surface of thumb tab “T.”

Thumb tab “T” is preferably positioned angularly and generally non-perpendicularly to e.g. upper and lower edges110,115, and angularly and generally non-parallel to e.g. header tube150. Nevertheless, thumb tab “T” can be mounted anywhere upon dredge head18, in any position and orientation, and have other characteristics and configurations which enable a user to grasp, hold, and/or otherwise manipulate dredge head18relatively more easily or comfortably as compared to dredge heads without such thumb tab “T.” Optionally, dredge head18includes a plurality of thumb tabs “T,” spaced from each other, which enable a user to grasp, hold, and/or otherwise manipulate dredge head18relatively more easily or comfortably as compared to dredge heads without ones of such thumb tabs “T.”

Header tube150is an elongate, cylindrical member which extends generally perpendicularly from blade100. In addition, an opening extends generally axially through header tube150, whereby the header tube is a generally hollow member.

Header tube150generally defines various portions thereof, namely blade interface portion155, front header portion165, medial header portion170, and rear header portion175. The header tube150is adapted and configured to connect, and generally span between, blade100and various tubes, hoses, or other conduits, of dredge system10, such as ones of hoses24A,24B.

Blade interface portion155defines a first end of header tube150, proximate blade100and connected thereto. The particular shape and characteristics of the terminal end of blade interface portion155corresponds to e.g. contours, radii, outer circumferential surface characteristics of at least part of blade100. In other words, the end of blade interface portion155is notched, machined, formed, cut, grinded, and/or otherwise adapted and configured to suitably interface with the respective portion of outer blade surface105.

As one example, referring toFIGS. 4 and 7, in embodiments which include oval blade apertures e.g. oval apertures “OA,” blade interface portion155can include an oval crimp. Such oval crimp can be imparted to blade interface portion155by applying a vertically directed compressive force, sufficiently great in magnitude to squeeze the upper and lower surfaces of blade interface portion155relatively nearer each other, whereby the outer wall of blade interface portion155retains a generally oval shaped configuration.

In such embodiments, which have oval crimped blade interface portion ends, the lateral surfaces are flared laterally outwardly from the remainder of header tube150. Accordingly, when viewed from above, each of the lateral sides of an oval crimped blade interface portion155appears to arcuately transition between blade100and the remainder of header tube150, as illustrated inFIG. 7.

As another example, referring toFIGS. 4 and 6, in embodiments which include round blade apertures e.g. round apertures “RA,” blade interface portion155, the end surfaces of the blade interface portion155defines a generally round shape, as viewed in an end view. In such embodiments, blade interface portion155extends generally perpendicularly from blade100, as illustrated inFIG. 6. The end of blade interface portion155which is distal blade100is attached to front header portion165.

Front header portion165is a generally cylindrical member which is adjacent and extends away from blade interface portion155, namely away from blade100. The opening, which extends axially through blade interface portion155, opens and extends into an opening which extends axially through front header portion165. In some embodiments, the end of front header portion165which is distal blade100is connected to medial header portion170.

Medial header portion170is a generally cylindrical member, adjacent and extending away from, front header portion165, namely away from blade100. The opening which extends axially through blade interface portion155and front header portion165opens and extends into an opening which extends axially through medial portion170.

As illustrated inFIGS. 2 and 3, as desired, medial header portion170can include one or more coupling mechanisms, which connect e.g. separable, distinct, portions of medial header portion170. Such coupling mechanisms, illustrated as generally annular rings which concentrically surround parts of medial header portion170, include, but are not limited to, threaded coupling mechanisms, snap-lock mechanisms, friction fit mechanisms, various adhesives and weldments, and/or other suitable coupling mechanisms.

In yet other embodiments, such as those illustrated inFIGS. 5,6, and7, the medial portion of header tube150is generally devoid of coupling mechanisms, whereby medial header portion170is generally not required in the assemblage of header tube150. In such embodiments, front header portion165is connected generally -directly to rear header portion175. By contrast, in embodiments which include medial header portion170, front header portion165is connected generally indirectly to rear header portion175, through the medial header portion170.

Rear header portion175is a generally cylindrical member, adjacent and extending away from, medial header portion170and/or front header portion165, namely away from blade100. The opening which extends axially through blade interface portion155, front header portion165, optionally through medial portion170, opens and extends into an opening which extends axially through rear header portion175. In other words, a cavity extends through the aperture of blade100and axially through the entire length of header tube150.

Accordingly, the opening which extends through blade interface portion155is generally coaxially aligned with the opening which extends through blade100, be it round aperture “RA,” oval aperture “OA,” or others. Accordingly, as suction energy provided by pump12draws material e.g. muck, sediment, articles, materials, sludge, biomass, debris mud, and/or other substances, through the blade aperture “RA,” “OA,” such material is also drawn through the opening which extends through blade interface portion155and axially through the remainder of header tube150.

Rear header portion175is adapted and configured to be removably attached to various tubes, hoses, or other conduits, of dredge system10, such as ones of hoses24A,24B. Exemplary of such removable attachment structure and configuration are various threaded coupler devices, parts of which are illustrated inFIGS. 2,3,5,6, and7. In embodiments which include threaded coupler devices and/or configurations, rear header portion175includes a threaded outer circumferential surface.

The characteristics of the threaded outer circumferential surface, of rear header portion175, corresponds to the characteristics of a threaded inner circumferential surface of a cooperating threaded coupling sleeve, attached to ones of the ends of e.g. hoses24A,24B. Namely, the cooperating threaded coupling sleeve and threaded outer circumferential surface of rear header portion175have threads with thread pitches and thread depths which correspond to each other, enabling a user to threadedly removably attach dredge head18to e.g. hoses24A,24B.

Nevertheless, rear header portion175can be otherwise adapted and configured to suitably, removably, attach dredge head18to hoses24A,24B. Such other suitable configurations include, but are not limited to, various snap-lock mechanisms, friction fit mechanisms, and/or others.

Upper pivot plate182is a generally planar member with an upper surface, a lower surface, forward and rearward facing edge surfaces, and first and second lateral surfaces. Upper pivot plate182spans generally between and is connected to ones of blade100and header tube155. Namely, the first lateral edge surface of upper pivot plate182interfaces with and is attached to an outer side surface of blade interface portion155, whereby the second lateral edge surface faces generally outwardly away from header tube150.

The forward facing edge surface of upper pivot plate182interfaces with and is attached to a rearwardly facing portion of plow outer surface105, above channel opening “CO.” Bore “B1” extends through the entire thickness of upper pivot plate182, illustrated in e.g.FIG. 3as proximate the rearward facing edge surface and generally between the first and second lateral edge surfaces.

Lower pivot plate183is a generally planar member with an upper surface, a lower surface, forward and rearward facing edge surfaces, and first and second lateral surfaces. Lower pivot plate183spans generally between and is connected to ones of blade100and header tube155. Namely, the first lateral edge surface of lower pivot plate183interfaces with and is attached to an outer side surface of blade interface portion155, whereby the second lateral edge surface faces generally outwardly away from header tube150.

The forward facing edge surface of lower pivot plate183interfaces with and is attached to a rearwardly facing portion of plow outer surface105, below channel opening “CO.” Bore “B2” extends through the entire thickness of lower pivot plate183, illustrated in e.g.FIG. 3as proximate the rearward facing edge surface and generally between the first and second lateral edge surfaces. Bore “B1” of upper pivot plate182and bore “B2” of lower pivot plate183are generally coaxially aligned with each other, enable e.g. pivot pin184to pass therethrough.

The lower surface of upper pivot plate182and the upper surface of lower pivot plate183generally define a void i.e. cavity “C” therebetween. The opening of cavity “C,” which is proximate blade100, is aligned with and opens and extends into cavity opening “CO” of blade100. In other words, the void of cavity opening “CO” extends through blade100, between upper and lower pivot plates182,183, and thus through cavity “C.”

Pivot pin184is an elongate generally cylindrical structure adapted and configured to e.g. guide actuatable arm200in pivotal movement or travel. As illustrated inFIG. 5, pivot pin184is a bolt with a bolt heads a bolt shaft, and a threaded end. Nut “N” is sized, adapted, and configured to cooperatively interface with the threads of the pivot pin threaded end. Accordingly, pivot pin184extends axially through bores “B1” and “B2” and is generally retained therein by the bolt head of pivot pin184and nut “N.”

Namely, the downwardly facing surface, e.g. the shoulder, of the bolt head of pivot pin184interfaces with the upper surface of upper pivot plate182and mechanically resists forces which tend to urge pivot pin184downwardly through bores “B1,” “B2.” And the upper surface of nut “N” interfaces with the lower surface of lower pivot plate183and mechanically resists forces which tend to urge pivot pin184upwardly through bores “B1,” “B2.” Pivot pin184includes other configurations which may or may not utilize a nut “N.” Exemplary of such other suitable pivot pins include, but are not limited to, various other bolts, rolled pins, forged pins, cast pins, extruded pins, and/or other pins, various securing devices e.g. cotter pins, and keys, captured pins, clevis pins, split cotters, and/or others.

Accordingly, in the complete assemblage of dredge head18, pivot pin184generally defines an axis of pivotation which is generally displaced from blade100, about which actuatable arm20pivots.

Actuatable arm200is adapted and configured to attenuate the rate at which non-desired debris and/or other non-desired materials enter and pass through dredge head18, optionally to generally prevent entrance of such non-desired materials into dredge head18. Accordingly, actuatable arm200is adapted and configured to generally slow the rate, minimize the likelihood, or prevent passage, of such non-desired materials into dredge system10.

Actuatable arm200further enables a user to, as desired, remove, clear, eliminate, and/or otherwise purge debris and/or other non-desired materials from the dredge head, generally without requiring the user to remove such debris with his or her hand. In other words, a user of dredge head18can remove, clear, eliminate, and/or otherwise purge debris and/or other non-desired materials from the dredge head while generally maintaining his or her hand(s), positionally, behind blade100.

Referring now toFIGS. 9A, and9B, handle end portion205is a generally elongate rigid member with first and second ends, forward and rearward facing surfaces, and upper and lower e.g. edge surfaces. The first end of handle end portion205faces generally away from the remainder of actuatable arm200and the second end of handle end portion205generally faces and is proximate the remainder of actuatable arm200, and intersects handle medial portion207.

Handle medial portion207includes first and second ends, a forward facing surface, a rearward facing surface, and upper and lower generally tapered surfaces. The forward and rearward facing surfaces of handle medial portion207are generally coplanar with respective ones of forward and rearward facing surfaces of handle end portion205.

The first end of medial portion207connects to handle end portion205and defines a first width dimension. The second end of medial portion207connects to e.g. the remainder to actuatable arm200and defines a second width dimension. The magnitude of the second width dimension is greater than the magnitude of the first width dimension.

The upper tapered surface extends generally angularly upwardly between the uppermost point of intersection of handle end portion205and medial portion207, and the uppermost point of intersection of medial portion207and handle base portion210. The lower tapered surface extends generally angularly downwardly between the lowermost point of intersection of handle end portion205and medial portion207, and the lowermost point of intersection of medial portion207and handle base portion210. In other words, in some embodiments, handle end portion205is generally narrower than handle base portion210and medial portion207taperingly transitions between and connects handle end portion205and base portion210.

Handle base portion210is a generally elongate rigid member with first and second ends, forward and rearward facing surfaces, and upper and lower e.g. edge surfaces. The first end of hand base portion210interfaces and is connected to handle medial portion207and the second end of hand base portion210interfaces and is connected to first arcuate transition portion212.

Ones of the forward and rearward facing surfaces of handle base portion210are generally coplanar with respective ones of the forward and rearward facing surfaces of handle medial portion207and/or handle end portion205. The upper and lower surfaces of handle base portion210extend generally parallel to each other, whereby handle base portion defines a generally constant width dimension along the length thereof.

First arcuate transition portion212includes forward and rearward facing surfaces, and upper and lower e.g. edge surfaces. First arcuate transition portion212is connected at a first end to handle base portion210and at a second end to connecting portion215. Transition portion212extends generally arcuately, optionally straight-line angularly or otherwise, between such base portion210and connecting portion215. Namely, first arcuate transition portion212extends generally arcuately away from the base portion210, generally in the direction which the forward facing surface of base portion210faces.

Connecting portion215includes forward and rearward facing surfaces, and upper and lower e.g. edge surfaces. A first end of connecting portion215is connected to first arcuate transition portion212and a second end of connecting portion215is connected to second arcuate transition portion217. Namely, connecting portion215generally defines an e.g. planar member which extends between and connects the first and second arcuate transition portions212and217.

Second arcuate transition portion217includes forward and rearward facing surfaces, and upper and lower e.g. edge surfaces. Second arcuate transition portion217is connected at a first end to connecting portion215and at a second end to grate220. Transition portion217extends generally arcuately, optionally straight-line angularly or otherwise, between such base connecting portion215and at a second end to grate220. Namely, second arcuate transition portion217extends generally arcuately away from base connecting portion215, whereby the end of second arcuate transition portion217which connects to grate220extends generally parallel to the direction in which handle base portion210extends.

In other words, first arcuate transition portion212and second arcuate transition portion217curvingly extend in generally opposite directions. Accordingly, in the entire assemblage of actuatable arm200, first arcuate transition portion212, connecting portion215, and second arcuate transition portion217, in combination, generally define a sigmoidal shape, outline, or perimeter, when viewed from above.

However, in some embodiments, actuatable arm200is generally devoid of first and second arcuate transition portions212,217, and base connecting portion215, whereby the actuatable arm200is generally straight-line linear between e.g. ones of end portion205, handle base portion210, and grate220.

Grate220includes at least one prong, preferably first and second prongs, namely upper prong225and lower prong230, optionally other prongs e.g. in addition to upper and lower prongs225,230, such as three or more prongs, as desired. The assemblage of grate200generally defines a second end portion of actuatable arm200, distal handle end portion205. Grate220is movable and adapted and configured to selectively extend across at least part of the aperture which extends through blade100.

Grate220is adapted and configured to prevent non-desired debris and materials, such as, but not limited to, rocks, sticks, other objects of certain minimum sizes, and/or others, from entering and traveling through dredge head18and thus into the remainder of dredging system10. At the same time, grate220permits passage of certain materials which are desiredly removed from e.g. the water body bottom. Accordingly, grate220is adapted and configured to balance the amount of obstruction which is employed to beneficially protect the system equipment, while still enabling passage of the desired sediments.

Upper prong225is an elongate generally rigid member with first and second ends, upper and lower surfaces, forward facing and rearward facing surfaces, and an end surface. The first end of upper prong225communicates with and is attached to second arcuate transition portion217

The forward facing surface of upper prong225generally faces the same direction as the forward facing surfaces of e.g. handle end portion205, handle medial portion207, and handle end portion210. Correspondingly, the rearward facing surface of upper prong225generally faces the same direction as the rearward facing surfaces of e.g. handle end portion205, handle medial portion207, and handle end portion210.

The upper surface of upper prong225generally faces the same direction as the upper surfaces of e.g. handle end portion205and handle end portion210. The lower facing surface of upper prong225generally faces the same direction as the lower surfaces of e.g. handle end portion205, handle medial portion207, and handle end portion210. And the end surface of upper prong225faces a generally opposite direction than the direction that the end surface of handle end portion205faces.

Referring now toFIGS. 6 and 8, when actuatable arm200is in a first position, designated as position “P1” inFIG. 6, upper prong225extends beyond the outer lateral perimeter of the blade aperture, and beyond e.g. the header tube/blade interface155. Namely, upper prong225extends beyond the header tube/blade interface155by at least about 1/64 inch, at least about 1/32 inch, at least about 1/16 inch, at least about ⅛ inch, at least about ¼ inch, at least about ½ inch, at least about ⅝ inch, at least about ⅞ inch, optionally at least about 1 inch, optionally others.

Accordingly, in first position “P1,” the rearward facing surface of upper prong225, at or adjacent the end of upper prong225, interfaces with the inner e.g. forward facing surface102of blade100. However, in other embodiments, upper prong225extends less than the entire distance across the blade aperture, whereby when actuatable arm200is in first position “P1,” generally no part of the rearward facing surface upper prong225interfaces with the inner e.g. forward facing surface102of blade100.

In some embodiments, such as that illustrated inFIG. 9B, upper prong225is generally arcuate, when viewed in a front elevation. In such embodiments, upper prong225extends arcuately, optionally straight-line linearly, upwardly from the point of intersection between upper prong225and second arcuate transition portion217to a maximum height or uppermost portion. From the maximum height or uppermost portion, upper prong225extends arcuately, optionally straight-line linearly, downwardly toward the terminal end thereof.

In some embodiments, such as that illustrated inFIG. 7, upper prong225is generally arcuate, when viewed from above. In such embodiments, upper prong225extends arcuately, optionally straight-line linearly, outwardly from the point of intersection between upper prong225and second arcuate transition portion217, e.g. outwardly away from blade100, to a point of maximum extension or outermost portion. From the maximum extension or outermost portion, upper prong225extends arcuately, optionally straight-line linearly, inwardly toward blade100and toward the terminal end of the upper prong225.

Referring now toFIGS. 9A and 9B, lower prong230is an elongate generally rigid member with first and second ends, upper and lower surfaces, forward facing and rearward facing surfaces, and an end surface. The first end of lower prong230communicates with and is attached to second arcuate transition portion217

The forward facing surface lower prong230generally faces the same direction as the forward facing surfaces of e.g. handle end portion205, handle medial portion207, handle end portion210, and upper prong225. Correspondingly, the rearward facing surface of lower prong230generally faces the same direction as the rearward facing surfaces of e.g. handle end portion205, handle medial portion207, handle end portion210, and upper prong225.

The upper surface of lower prong230generally faces the same direction as the upper surfaces of e.g. handle end portion205and handle end portion210, and faces the lower surface of upper prong225. The lower facing surface of lower prong230generally faces the same direction as the lower surfaces of e.g. handle end portion205, handle medial portion207, handle end portion210, and upper prong225. The end surface of lower prong230faces a generally opposite direction than the direction that the end surface of handle end portion205faces.

The magnitude of the length dimension of ones of upper prong225, lower prong230, or other prong(s) is optionally less than about 3 inches but preferably at least about 3 inches, at least about 3.5 inches, at least about 4 inches, at least about 4.5 inches, and others.

The magnitude of the width dimension of ones of upper prong225, lower prong230, or other prong(s) is optionally less than about ⅛ inch but preferably at least about ⅛ inch, at least about ¼ inch, at least about ⅜ inch, and others.

The distance between e.g. upper prong225and lower prong230has a magnitude of, for example, at least about ⅛ inch, at least about ¼ inch, at least about ⅜ inch, at least about ½ inch, at least about ⅝ inch, at least about ¾ inch, at least about ⅞ inch, at least about 1 inch, and others.

The distance between the upper surface of upper prong225and the lower surface of lower prong230, e.g. the overall width dimension of grate220, has a magnitude of, for example, at least about ½ inch, at least about ⅝ inch, at least about ¾ inch, at least about ⅞ inch, at least about 1 inch, at least about 1⅛ inch, at least about 1¼ inch, at least about 1⅜ inch, at least about 1½ inch, at least about 1⅝ inch, at least about 1¾ inch, at least about 1⅞ inch, at least about 2 inches, and others.

Referring now toFIGS. 6 and 9A, a first angle e.g. the angle defined between handle ones of handle end portion205, handle medial portion207, handle base portion210and connecting portion215, and a second angle e.g. the angle defined between connecting portion215and grate220, generally correspond to each other. Namely, such first and second angles correspond in magnitude to each other, whereby ones of handle end portion205, handle medial portion207, handle base portion210and the grate220are parallel to each other, yet offset or stepped from each other e.g. are not coplanar with each other.

The distance measured perpendicularly between a straight-line projected from the rearward facing surface of grate220and the forward facing surfaces of ones of handle end portion205, handle medial portion207, and handle base portion210corresponds in magnitude to the magnitude of the thickness dimension of blade100. Accordingly, when actuatable arm200is in the first position “P1,” the rearward facing surface of grate220closely communicates with and faces the inner e.g. forward facing surface102of blade100. Also, the forward facing surfaces of ones of handle end portion205, handle medial portion207, and handle base portion210closely communicate with and face the outer e.g. rearward facing surface105of blade100.

Referring now toFIGS. 6 and 8, when actuatable arm200is in first position “P1” (FIG. 6), lower prong230extends beyond the outer lateral perimeter of the blade aperture, and beyond e.g. the header tube/blade interface155. Namely, lower prong230extends beyond the header tube/blade interface155by at least about 1/64 inch, at least about 1/32 inch, at least about 1/16 inch, at least about ⅛ inch, at least about ¼ inch, at least about ½ inch, at least about ⅝ inch, at least about ⅞ inch, optionally at least about 1 inch, optionally others.

Accordingly, in first position “P1,” the rearward facing surface of lower prong230, at or adjacent the end of lower prong230, interfaces with the inner e.g. forward facing surface102of blade100. However, in other embodiments, lower prong230extends less than the entire distance across the blade aperture, whereby when actuatable arm200is in first position “P1,” generally no part of the rearward facing surface lower prong230interfaces with the inner e.g. forward facing surface102of blade100.

In some embodiments, such as that illustrated inFIG. 9B, lower prong230is generally arcuate, when viewed in a front elevation. In such embodiments, lower prong230extends arcuately, optionally straight-line linearly, downwardly from the point of intersection between lower prong230and second arcuate transition portion217to a minimum height or lowermost portion thereof. From the minimum height or lowermost portion, lower prong230extends arcuately, optionally straight-line linearly, upwardly toward the terminal end thereof.

In some embodiments, such as that illustrated inFIG. 7, lower prong230is generally arcuate, when viewed from above. In such embodiments, lower prong230extends arcuately, optionally straight-line linearly, outwardly from the point of intersection between lower prong230and second arcuate transition portion217, e.g. outwardly away from blade100, to a point of maximum extension or outermost portion. From the maximum extension or outermost portion, lower prong230extends arcuately, optionally straight-line linearly, inwardly toward blade100and toward the terminal end of the lower prong230.

Referring now toFIGS. 3,9A, and9B, actuatable arm200includes a connecting mechanism e.g. hinge barrel “HB,” which is adapted and configured to, alone or in combination with other components, connect arm200to the remainder of dredge head18. Hinge barrel “HB” is an elongate, cylindrical member with an upper end, a lower end, and an outer circumferential surface. A through bore, namely bore “B3,” extends axially through hinge barrel “HB.”

Hinge barrel “HB” extends generally upright and vertically and is fixedly attached the remainder of actuatable arm200. In other words, a portion of the outer circumferential surface of hinge barrel “HB” is attached to the rearward facing surface, optionally the forward facing surface, of handle base portion210, adjacent the intersection of base portion210and first arcuate transition portion212, optionally elsewhere along the length of actuatable arm200.

In the entire assemblage of dredge head18, hinge barrel “HB” is generally housed within the actuation mechanism180, e.g. between upper pivot plate182and lower pivot plate183, whereby actuatable arm200is pivotably connected to the remainder of dredge head18. In other words, hinge barrel “HB” occupies part of the void within channel “C.”

The magnitude of the length dimension of hinge barrel “HB” corresponds to the distance between the lower surface of upper pivot plate182and the upper surface of pivot plate183. Namely, hinge barrel “HB” fits snugly between the upper and lower pivot plates182,183, yet freely enough to sufficiently enable a user to, using one hand, pivotably actuate actuatable arm200as desired.

Referring now toFIG. 3, when actuatable arm200is pivotably connected to the remainder of dredge head18, bore “B1” of upper pivot plate182, bore “B3” of actuatable arm200, and bore “B2” of lower pivot plate183, are generally coaxially aligned with each other. Pivot pin184extends axially through bores “B1,” “B2,” and “B3” thereby pivotably attaching actuatable arm200to e.g. upper and lower pivot plates182,183. The particular spatial, dimensional, frictional, and/or other characteristics and relationships realized and/or defined between respective ones of upper and lower pivot plates182,183, pivot pin184, hinge barrel “HB,” and others, are selected to suitably provide the desired use characteristics of dredge head18e.g. desired amount of free-play between actuatable arm200and the remainder of dredge head18, and/or others.

In the complete assemblage of dredge head18, the actuatable arm200is generally free of freely or loosely wobbling characteristics or otherwise generally free from movement in non-desired manners, with respect to the other components of dredge head18. In other words, when a user applies a force, upwardly or downwardly upon handle end portion205, actuatable arm200generally does not wobble upon pivot pin184, whereby the shape, dimensions, and overall perimeter characteristics of the blade apertures remain generally or substantially the same as the shape, dimensions, and overall perimeter characteristics of the blade apertures when handle end portion205is generally not under such user applied force.

The clearance between e.g. (i) the upper surface of hinge barrel “HB” and/or other upper surfaces of actuatable arm200and the lower surface of upper pivot plate182, and/or (ii) the lower surface of hinge barrel “HB” and/or other lower surfaces of actuatable arm200and the upper surface of lower pivot plate183, and/or (iii) other portions of actuatable arm200which interface or communicate with respective portions of actuation mechanism180, is less than about ¼ inch, less than about 3/16 inch, less than about ⅛ inch, less than about 1/16 inch, less than about 1/32 inch, and others, as desired.

Accordingly, in the complete assemblage of dredge head18, hinge barrel “HB” and/or other portions of actuatable arm200which interface or communicate with respective portions of actuation mechanism180, extend along and e.g. cover more than about ½ of the length of pivot pin184, at least about ⅔ of the length of pivot pin184, at least about ¾ of the length of pivot pin184, at least about ⅞ of the length of pivot pin184, and others, as desired.

In some embodiments of the complete assemblage of dredge head18, hinge barrel “HB” and/or other portions of actuatable arm200which interface or communicate with respective portions of actuation mechanism180, extend along and e.g. cover more than about ½ of the portion of the length of pivot pin184which extends between upper and lower pivot plates182,183, at least about ⅔ of the portion of the length of pivot pin184which extends between upper and lower pivot plates182,183, at least about ¾ the portion of the length of pivot pin184which extends between upper and lower pivot plates182,183, at least about ⅞ of the portion of the length of pivot pin184which extends between upper and lower pivot plates182,183, and others, as desired.

Referring now toFIGS. 6 and 8, when actuatable arm200is in first position “P1,” grate220and/or the prong(s) which at least partially define grate220, extend across the blade aperture and thereby define separate, distinct portions of the blade aperture. The number, shapes, profiles, and other configurations of the distinct aperture portions are based, at least in part, on e.g. the number, shapes, and configurations, of the prongs of actuatable arm200.

As one example, in embodiments of dredge head18which include a single prong, when actuatable arm200is in first position “P1,” the single prong generally separates the opening of the blade aperture into first and second portions, the first opening above the single prong and the second opening below the single prong.

As another example, in embodiments of dredge head18which include upper and lower prongs225and230, such as the embodiment illustrated inFIG. 8, the actuatable arm200, in the first position “P1,” generally defines first second and third opening which extend into the blade aperture.

Namely, the portion of oval aperture “OA” which is generally between the upper surface of upper prong225and the upper portion of the perimeter of oval aperture “OA” generally defines upper opening “UO.” The portion of oval aperture “OA” which is generally between the lower surface of upper prong225and the upper surface of lower prong230generally defines medial opening “MO.” And the portion of oval aperture “OA which is generally between the lower surface of lower prong230and the lower portion of the perimeter of oval aperture “OA” generally defines lower opening “LO.”

Accordingly, upper opening “UO” has a generally planar lower perimeter edge and a generally arcuate upper perimeter edge. Medial opening “MO” has generally planar upper and lower perimeter edges, generally parallel to each other, and generally arcuate side perimeter edges. Lower opening “LO” has a generally planar upper perimeter edge and a generally arcuate lower perimeter edge.

In embodiments of dredge head18which include arcuate upper and lower prongs225,230, such as that illustrated inFIG. 9B, upper and lower openings “UO” and “LO” have generally crescent shaped perimeter edges. Also in such embodiments, medial opening “MO” defines a generally elliptical perimeter.

In embodiments in which actuatable arm200includes three or more prongs, the actuatable arm200generally defines four or more openings which extend into the blade aperture. The particular shape, profile, and/or other configuration of ones of the openings correspond to the particular shape, profile, and/or other configuration, of ones of the prongs of actuatable arm200.

Referring now toFIGS. 2,3,5,6, and7, and more particularly to e.g. actuatable interactions between various components of dredge head18, in the complete assemblage of dredge head18, actuatable arm200is pivotably attached to the remainder of the dredge head. In other words, actuatable arm200is adapted and configured to pivotably move between first position “P1” and a second position “P2” (FIG. 6).

Regarding the complete assemblage of dredge head18, a first portion of actuatable arm200lies generally movably in front of the inner e.g. forward facing surface102of blade100whilst a second portion of actuatable arm200lies generally movably rearward of the outer e.g. rearward facing surface105of blade100. Namely, grate220and/or other parts of actuatable arm200are pivotably and/or otherwise movably positioned in front of or forward of blade inner surface102, generally within the cavity or void defined within inner surface102of the arcuate wall of blade100. Handle end portion205and/or other parts of actuatable arm200are pivotably and/or otherwise movably positioned behind the rearward facing outer surface105of blade100.

When actuatable arm200is in position “P1” (FIG. 6), as discussed in greater detail elsewhere herein, portions of the actuatable arm200, such as grate220, movably and selectably extend across portions of the aperture of blade100, e.g. oval or round aperture “OA,” “RA.” And when actuatable arm200is in position “P2,” portions of the arm200such as grate220generally do not extend across, cover, or communicate with, the blade aperture. The user pivots actuatable arm200to infinitely vary the position of the arm200, in real-time, between first position “P1” and second position “P2” as desired.

Referring now toFIG. 6, the pivotable travel of actuatable arm200can be generally defined with respect to the arcuate or pivotable travel of handle end portion205. Namely, angle α generally defines the pivotably distance traveled as actuatable arm200pivots from first position “P1” to second position “P2,” about an axis of pivotation generally defined by pivot pin184.

Since grate220is fixedly attached to handle end portion205, directly or by way of various intermediary structures such as, but not limited to, various ones of handle medial portion207, handle base portion210, first arcuate transition portion212, connecting portion215, and second arcuate transition portion217, as handle end portion205pivotably travels in a first direction, grate220correspondingly pivotably travels in a second, generally opposite, direction. Accordingly, the angular distance traveled by handle end portion205and grate220correspond to each other.

The magnitude of angle α is selected to provide suitable use characteristics of dredge head18. In other words, the magnitude of angle α is sufficiently great so that as handle end portion205is pivoted toward position “P2,” the non-desired debris and/or other non-desired materials which accumulate at, on, and/or otherwise adjacent, grate220, slides from, falls from, or is e.g. otherwise, eliminated, ridded, and/or otherwise removed from grate220, without decreasing the suction power provided by pump12.

The magnitude of angle α can be any of a variety of suitable magnitudes of angles, which include, but are not limited to, e.g. at least about 45 degrees, at least about 50 degrees, at least about 55 degrees, at least about 60 degrees, at least about 65 degrees, at least about 70 degrees, at least about 75 degrees, at least about 80 degrees, at least about 85 degrees, and others.

When actuatable arm200is in first position “P1,” the end of the grate220is positioned laterally beyond a straight-line projected from the second header tube lateral surface which is most proximate the end of grate220(FIG. 6). And when the actuatable arm200is in the second position “P2,” the end of grate220is positioned generally between a straight-line projected from a first header tube lateral surface and a straight-line projected from a second header tube lateral surface, optionally laterally outwardly beyond such straight-line projected from the second header tube lateral surface.

To use dredge head18, the user connects, e.g. threadedly or otherwise couples, rear header portion175to a suitable hose such as ones of hoses24A,24B. The user then energizes pump12and thereby activates the dredging system10, and dives or submerges to the bottom of the body of water to be cleaned.

The user grippingly holds dredge head18by way of grasping various portions thereof and preferably by also clutching thumb tab “T” with his or her thumb. Once the user secures dredge head18in his or her hand, the user manipulates dredge head18so that blade100interfaces the bottom surface of the body of water and thus interfaces the various materials to be removed e.g. muck, sludge, sediment, biomass, mud, and/or other non-desired materials.

The non-desired materials are then suctioningly forced upwardly through dredge head18, the hose or series of hoses, into and/or through gravity filter14, whereby the materials which pass through gravity filter14ultimately pass through and are discharged from pump12, hence removed from the bottom surface of the body of water.

As certain materials and/or objects accumulate at grate220, the user clears such debris e.g. material accumulation and/or material obstruction of dredge head18by pivoting actuatable arm200. Namely, as the user desires to clear the debris from dredge head18, the user applies a force to handle end portion205which urges handle end portion205arcuately back, generally toward e.g. rear header portion175and the hose connected to the dredge head18, whereby actuatable arm pivots from first position “P1” toward second position “P2.”

As handle end portion205pivots arcuately backwardly, grate220pivots generally arcuately forward and laterally, about a common axis of pivotation defined by pivot pin184. When grate220is pivoted sufficiently far, in other words when actuatable arm is pivoted sufficiently close to second position “P2,” the materials and/or objects which are accumulated upon grate220are generally out of the suction line or suction column which extends outwardly from the blade apertures, e.g. round or oval aperture “RA,” “OA,” so that the materials and/or objects which are accumulated upon grate220are under relatively less influence of the suction force of dredge head18. Accordingly, when the suction force applied to such materials and/or objects which are accumulated upon grate220is sufficiently low, the materials and/or objects which are accumulated upon grate220, slide from, fall from, or are e.g. otherwise, eliminated, ridded, and/or otherwise removed, gravitationally or otherwise, from grate220.

Then, once dredge head18is sufficiently cleared, the user pivots actuatable arm200back toward first position “P1,” whereby grate220extends generally across the blade aperture, thereby providing a mechanical interface which protects dredge system10from having at least some non-desired objects/materials entering thereinto.

In some embodiments, the surface area defined by the rearwardly facing surfaces of prongs225,230is sufficiently great so that the suction force of dredge head18suctioningly urges grate220against blade100. In other words, in some embodiments, the suction generated by pump12pulls and holds the grate220back against blade100, whereby the resting condition of actuatable arm200, when pump12is energized, is the first position “P1.” Nevertheless, in such embodiments, grate220is adapted and configured, e.g. the surface area of grate220is sufficiently small, so that the user can overcome such suctioningly biasing force, which enables a user to pivotably move actuatable arm200between the first and second positions “P1,” “P2,” as desired.

Although dredge head18has been described with respect to embodiments having actuation mechanism180and thus pivot pin184located on a first side of the dredge head device, and accordingly having actuatable arm200extending generally in a first direction, it is fully appreciated and well within the scope of the invention that dredge head18can include e.g. actuation mechanism180and thus pivot pin184located on a second, opposite side of the dredge head device, and accordingly have actuatable arm200extending in a generally second, opposite direction. In such embodiments, the dredge head18is generally a mirror image of the illustrated embodiments, as reflected about a line which extends medially through the dredge head18.

In some embodiments, dredge head18includes first and second actuatable arms200. The actuatable arms200can be located on and/or pivot from generally the same side of the dredge head whereby, for example, the arms200are vertically or otherwise stacked with respect to each other. Optionally, ones of the plurality of actuatable arms200are located on and/or pivot from different sides of the dredge head18, whereby, for example, the arms200are stacked with respect to each other or have e.g. intertwining or otherwise interfacing components such as various cooperating prongs.

In yet other embodiments, actuatable arm(s)200can pivot generally upwardly, downwardly, or otherwise, besides laterally as illustrated. For example, in embodiments in which an actuatable arm pivots generally upwardly or downwardly, various components of dredge head18are located at e.g. upper or lower portions thereof. In other words, in embodiments in which an actuatable arm200is pivotably movable generally arcuately upwardly or downwardly, actuation mechanism180, pivot pin184, cavity “C,” cavity opening “CO,” and/or other components, are e.g. rotated about 90 degrees and adapted and configured to the dredge head18, whereby gate220is adapted and configured to pivot generally or generally downwardly, as desired.

Preferably, dredge head18is made of materials which resist corrosion, and are suitably strong and durable for normal extended use. Those skilled in the art are well aware of certain metallic and non-metallic materials which possess such desirable qualities, and appropriate methods of forming such materials.

Non-metallic materials suitable for components of dredge head18are various polymeric compounds, such as for example and without limitation, various of the polyolefins, such as a variety of the polyethylenes, e.g. high density polyethylene, or polypropylenes. There can also be mentioned as examples such polymers as polyvinyl chloride and chlorinated polyvinyl chloride copolymers, various of the polyamides, polycarbonates, and others.

For any polymeric material employed in structures of the invention, any conventional additive package can be included such as, for example and without limitation, slip agents, anti-block agents, release agents, anti-oxidants, fillers, and plasticizers, to control e.g. processing of the polymeric material as well as to stabilize and/or otherwise control the properties of the finished processed product, also to control hardness, bending resistance, and the like.

Common industry methods of forming such polymeric compounds will suffice to form non-metallic components of dredge head18. Exemplary, but not limiting, of such processes are the various commonly-known plastics converting processes.

Dredge head18is preferably manufactured as individual components, and the individual components assembled as sub-assemblies, including but not limited to, blade100, header tube150, actuation mechanism180, pivot pin184, nut “N,” actuatable grate200, and/or others. Each of the aforementioned sub-assemblies is then assembled to respective other ones of the sub-assemblies to develop dredge head18.

Those skilled in the art will now see that certain modifications can be made to the apparatus and methods herein disclosed with respect to the illustrated embodiments, without departing from the spirit of the instant invention. And while the invention has been described above with respect to the preferred embodiments, it will be understood that the invention is adapted to numerous rearrangements, modifications, and alterations, and all such arrangements, modifications, and alterations are intended to be within the scope of the appended claims.

To the extent the following claims use means plus function language, it is not meant to include there, or in the instant specification, anything not structurally equivalent to what is shown in the embodiments disclosed in the specification.