Low-profile compression hatch door for air cart tanks

Abstract

Disclosed examples generally relate to a low-profile compression hatch door for air cart tanks. In at least one example, the low-profile compression hatch door for an air cart tank, comprises at least one rotatable linkage; a covering member for covering an opening of the air cart tank, the covering member being coupled to the at least one rotatable linkage through a first rotatable coupling; at least one translation assembly for translating the covering member, and coupled to the at least one rotatable linkage through a second rotatable coupling; an actuator mechanism being coupled to the at least one rotatable linkage, through a third rotatable coupling, wherein the actuator mechanism is configured to apply a linear axial force, along a translation axis, to the at least one rotatable linkage, in order to translate the covering member between: an open position, an intermediate closed, un-compressed position, and a closed, compressed position.

Description

TITLE: LOW-PROFILE COMPRESSION HATCH DOOR FOR AIR CART TANKSCROSS-REFERENCE TO RELATED APPLICATION(S)

[0001] This application claims priority to and the benefit of U.S. Provisional Patent Application No. 63 / 662,525, filed on June 21, 2024, the entire contents of which are incorporated herein by reference.FIELD

[0002] Various embodiments are described herein that generally relate to hatch doors used for opening and closing tanks on air carts, and in particular, to a low-profile compression hatch door for air cart tanks.BACKGROUND

[0003] Air carts are used for dispensing granular agricultural product (e.g., seeds, fertilizers, micro-nutrients, inoculants, etc.) over fields. An air cart typically includes one or more tanks for retaining the agricultural product, and hatch doors for accessing each tank.SUMMARY

[0004] According to one broad aspect, there is disclosed a low-profile compression hatch door for an air cart tank, comprising: at least one rotatable linkage; a covering member for covering an opening of the air cart tank, the covering member being coupled to the at least one rotatable linkage through a first rotatable coupling; at least one translation assembly for translating the covering member, and coupled to the at least one rotatable linkage through a second rotatable coupling; an actuator mechanism being coupled to the at least one rotatable linkage, through a third rotatable coupling, wherein the actuator mechanism is configured to apply a linear axial force, along a translation axis, to the at least one rotatable linkage, in order to translate the covering member between: (i) an open position, (ii) an intermediate closed, un-compressed position, and (iii) a closed, compressed position.

[0005] According to another broad aspect, there is disclosed an air cart comprising: an air cart tank having a tank opening for accessing an inner volume of the tank; and a low-profile compression hatch door for opening and closing the tank opening, wherein the low-profile compression hatch door comprises: at least one rotatable linkage; a covering member for covering an opening of the air cart tank, the covering member being coupled to the at least one rotatable linkage through a first rotatable coupling; at least one translation assembly for translating the covering member, and coupled to the at least one rotatable linkage through a second rotatable coupling; an actuator mechanism being coupled to the at least one rotatable linkage, through a third rotatable coupling, wherein the actuator mechanism is configured to apply a linear axial force, along a translation axis, to the at least one rotatable linkage, in order to translate the covering member between: (i) an open position, (ii) an intermediate closed, un-compressed position, and (iii) a closed, compressed position.

[0006] According to another broad aspect, there is disclosed an air cart tank comprising: a tank opening to access an inner volume of the tank; and a low-profile compression hatch door for opening and closing the tank opening, wherein the low-profile compression hatch door comprises: at least one rotatable linkage; a covering member for covering an opening of the air cart tank, the covering member being coupled to the at least one rotatable linkage through a first rotatable coupling; at least one translation assembly for translating the covering member, and coupled to the at least one rotatable linkage through a second rotatable coupling; an actuator mechanism being coupled to the at least one rotatable linkage, through a third rotatable coupling, wherein the actuator mechanism is configured to apply a linear axial force, along a translation axis, to the at least one rotatable linkage, in order to translate the covering member between: (i) an open position, (ii) an intermediate closed, uncompressed position, and (iii) a closed, compressed position.

[0007] According to another broad aspect, there is provided a method for operating a low- profile compression hatch door for an air cart tank, comprising: operating an actuator mechanism to apply a linear axial force, along a translation axis, to at least one rotatable linkage in order to translate a covering member of the hatch door between: (i) an open position, (ii) an intermediate closed, uncompressed position, and (iii) a closed, compressed position, wherein the actuator mechanism is coupled to the at least one rotatable linkage through a first rotatable coupling, and the covering member is coupled to the at least one rotatable linkage through a second rotatable coupling.

[0008] Other features and advantages of the present application will become apparent from the following detailed description taken together with the accompanying drawings. It should be understood, however, that the detailed description and the specific examples, while indicating preferred embodiments of the application, are given by way of illustration only, since various changes and modifications within the spirit and scope of the application will become apparent to those skilled in the art from this detailed description.BRIEF DESCRIPTION OF THE DRAWINGS

[0009] For a better understanding of the various embodiments described herein, and to show more clearly how these various embodiments may be carried into effect, reference will be made, by way of example, to the accompanying drawings which show at least one example embodiment, and which are now described. The drawings are not intended to limit the scope of the teachings described herein.

[0010] FIG. 1 A is an image of an example air cart;

[0011] FIGs. IB - ID illustrate a compression hatch door, in accordance with at least one disclosed example, located under a catwalk and in various positions including a closed position (FIG. IB) and an open position (FIGs. 1C and ID);

[0012] FIGs. 2A and 2B are perspective views of an example air cart compression hatch door, according to at least one example, and in an open position;

[0013] FIG. 3 A and 3B are perspective views of the compression hatch door, of FIGs. 2A and 2B, and in a closed and un-compressed position;

[0014] FIGs. 4A and 4B are perspective views of the compression hatch door, of FIGs. 2A and 2B, and in a closed and compressed position;

[0015] FIGs. 5A and 5B illustrate side views of a covering member, of a compression hatch door, in a closed and uncompressed position (FIG. 5A) and a closed and compressed position (FIG. 5B);

[0016] FIGs. 5C - 5D illustrate a rotatable linkage in an unrotated position (FIG. 5C) and a rotated position (FIG. 5D), according to an example;

[0017] FIGs. 5E - 5F illustrate a rotatable linkage in an unrotated position (FIG. 5E) and a rotated position (FIG. 5F), according to another example;

[0018] FIG. 6A illustrates a compression hatch door, in accordance with another example, in an open position;

[0019] FIGs. 6B and 6C illustrate the compression hatch door, of FIG. 6A, in perspective view (FIG. 6B) and side elevation view (FIG. 6C), and showing the door in a partially open position;

[0020] FIGs. 7A and 7B illustrate the compression hatch door, of FIG. 6A, in perspective view (FIG. 7A) and side elevation view (FIG. 7B), and showing the door in a closed and uncompressed position;

[0021] FIGs. 8A and 8B illustrate the compression hatch door, of FIG. 6A, in perspective view (FIG. 8A) and side elevation view (FIG. 8B), and showing the door in a closed and compressed position;

[0022] FIG. 9A and 9B illustrate side elevation views of the compression hatch door, of FIG. 6A, in the open position (FIG. 9A) and the closed and compressed position (FIG. 9B);

[0023] FIG. 10A illustrates a top perspective view of an isolated covering member, with translation assemblies;

[0024] FIG. 10B illustrates a cross-sectional view of a translation assembly, along the section line 10B-10B’ of FIG. 10A;

[0025] FIG. 11 is a perspective view of a tank opening frame; and

[0026] FIG. 12 is a bottom-up perspective view of a mounted door assembly.

[0027] Further aspects and features of the example embodiments described herein will appear from the following description taken together with the accompanying drawings.DETAILED DESCRIPTION

[0028] Embodiments herein generally relate to a low-profile compression hatch door for air cart tanks, and a method of operating thereof.I. GENERAL OVERVIEW

[0029] FIG. 1A illustrates an example air cart 102, for retaining agricultural product. The air cart 102 is used for dispensing granular product (e.g., seeds, fertilizers, micro-nutrients, inoculants, etc.) over a field.

[0030] As illustrated, the air cart 102 includes one or more tanks 104a - 104c (also referred to herein as “tank bins”). Tanks 104 are adapted to retain agricultural product dispensed over a field.

[0031] Each tank 104 includes one or more associated hatch doors 106a - 106d, enabling access to an inner volume of the tank 104. For example, tank 104a includes two hatch door 106a, 106b, while tanks 104b, 104c each include a single respective hatch door 106c, 106d. Hatch doors 106 may be positioned along an upper surface 110 of the air cart to allow for ease of access.

[0032] To this end, conventional designs of hatch doors 106 use a “swinging door” design. The hatch 106 comprises a lid that “swings” back to open, and forward to close. Conventional “swinging door” designs of this nature, however, suffer from a number of distinct drawbacks.

[0033] First, a swinging door design requires ample surrounding space to accommodate the swing back. In turn, it is difficult to install these types of doors in constricted spaces, such as underneath structures, e.g., catwalks, that limit the swinging space (see e.g., catwalk 150 in FIGs. IB - ID).

[0034] Second, when opened, the swinging lid often acts as an obstruction. For example, the swinging door obstructs, or inhibits, maneuvering of the fill systems (e.g., conveyor 108), and can also prevent manual operation of the fill system around that area.

[0035] Third, a significant amount of force is required to compress the hatch 106 into the closed position. Hatches 106 provide an important sealing function to tanks 104, and require the hatches 106 to be sealed closed. The sealing is necessary to maintain an internal pressurization within the tank 104 that enables a pressurized air flow to dispense product from within the tank 104 onto a field. In many cases, the compressed sealing is effected through a large linkage. The linkage is attached to the swinging door, and provides enough force to secure the hatch 106 in closed sealed compression, thereby maintaining internal tank pressurization. However, because the linkage is large in size, it also consumes additional space (i.e., in addition to the space consumed by the swinging hatch lid itself), and can also act as an obstruction to the fill system.

[0036] To at least partially mitigate these drawbacks, examples herein provide for a low- profile compression hatch door (also referred to herein interchangeably as a “compression hatch door”, “compression hatch”, “hatch door”, or simply a “hatch”).

[0037] The hatch door is considered to be “low profile” because it is movable along the full range of motion - between the closed and open position - while maintaining a relatively low and consistent “elevation” above the tank opening. This allows the door to be installed in narrow or constricted spaces, without requiring ample surrounding spaced to open or close.

[0038] Additionally, as contrasted to swinging door designs, the exemplified hatch door can be opened without obstructing surrounding systems. For example, the hatch door can be opened without substantially obstructing the motion path of the fill system 108. As explained herein, this is also owing to the “low profile” design of the hatch door.

[0039] The disclosed design also uses smaller linkages to effect compression. This also allows the hatch door to occupy less space overall, and prevents the linkages from also acting as an obstruction to other systems (e.g., the fill system).II. LOW-PROFILE COMPRESSION HATCH DOOR

[0040] FIGs. 2 - 9 exemplify designs for a compression hatch door 202, in accordance with the teachings herein, including: (i) a first example configuration for the hatch door 202 (FIGs. 2 - 4), and (ii) a second example configuration of the hatch door 202 (FIGs. 6 - 9). The second example configuration may be adapted for larger door designs that are required, for example, to open and close larger tank openings.

[0041] Concurrent reference is now made herein to each of FIGs. 2 - 4 (first example configuration), and FIGs. 6 - 9 (second example configuration).

[0042] At a broad level, the compression hatch door 202 operates by translating between three (3) positions: (i) an initial open position (FIGs. 2A - 2B and FIGs. 6A - 6C); (ii) an intermediate closed and “uncompressed” position (FIGs. 3 A - 3B and FIGs. 7A - 7B), and (iii) a final closed and “compressed” position (FIGs. 4A - 4B and FIGs. 8 A - 8B). The positional order is reversed when the hatch door 202 is being opened, rather than closed.

[0043] In the open position (FIGs. 2A - 2B and FIGs. 6A - 6C), the hatch door 202 is retracted such that the tank opening 250 is substantially accessible. This allows, for example, filling the associated tank 104 with agricultural product.

[0044] From the initial open position, the hatch door 202 is translated into the intermediate closed and “uncompressed” position (FIGs. 3 A - 3B and FIGs. 7A - 7B). This translation can occur along a translation axis 252a (FIG. 2B and FIG. 6A). In an upright orientation, translation axis 252a may be substantially parallel to the horizontal plane. It is understood, however, that the hatch door 202 is not limited to any particular position and / or orientation.

[0045] In the intermediate closed and “uncompressed” position (FIGs. 3 A - 3B and FIGs. 7A - 7B), the tank opening 250 is substantially covered over by the hatch door 202. This effectively blocks access to the associated tank 104.

[0046] The hatch door 202 is then translated from the intermediate closed and “uncompressed position”, into the final closed and “compressed” position (FIGs. 4A - 4B and FIGs. 8A - 8B). This occurs by translating the hatch door 202, or a portion thereof, along a compression axis 252b (FIGs. 4A and 8A). Compression axis 252b may be generally orthogonal to the translation axis 252a. In this final closed and “compressed” position, the tank opening 250 is effectively sealed-off from the ambient surrounding, thereby pressurizing the associated tank 104.

[0047] As noted, when it is desired to open and access the tank opening 250, the described process is applied in reverse.

[0048] FIGs. 5 A and 5B comparatively exemplify a side profile of the first example hatch door 202 design, of FIGs. 2 - 4, as between: (i) the initial open position (FIG. 5 A), and (ii) the final closed and “compressed” position (FIG. 5B).

[0049] As shown, in the initial open position (FIG. 5A), the hatch door 202 has an overall elevation profile 580a, above the air cart tank opening 250, as defined along compression axis 252b. The elevation profile 580a is substantially maintained while the hatch door 202 is being translated between the open position (FIGs. 2A - 2B), and the intermediate closed and “uncompressed” position (FIGs. 3A - 3B), and vice-versa. When the hatch door 202 is compressed into the final closed, “compressed” position (FIG. 5B), the hatch door 202 has a reduced elevation profile 580b.

[0050] In view of this, through-out its entire motion profile (e.g., opened to closed, and vice- versa), hatch door 202 maintains a relatively constant and “low” profile above the tank opening 250, defined along compression axis 252b.

[0051] Similarly, FIGs. 9A and 9B comparatively exemplify a side profile of the second example hatch door 202 design, of FIGs. 6 - 8, and between: (i) the initial open position (FIG. 9A), and (ii) the final closed and “compressed” position (FIG. 9B).

[0052] Again, it is observed that the hatch door 202 maintains a relatively constant and low- profile elevation throughout the entire motion trajectory. In the open position (FIG. 9A), the hatch door 202 has an elevation 580a, which is maintained as the hatch door 202 is translated between the open position (FIGs. 6A - 6C) into the intermediate closed, uncompressed position (FIGs. 7A - 7B). The hatch door 202 has a marginally increased elevation 580b in the closed, compressed position (FIG. 9B).

[0053] In view of the foregoing, as compared to conventional swinging door designs, the exemplified low profile hatch 202 is opened and closed without occupying excessive surrounding space, especially in the open position. In turn, this allows the hatch door 202 to open and close in tight and confined spaces. This is best exemplified in FIGs. IB - ID, which illustrates the hatch door 202 design, of FIGs. 6 - 8, installed under a catwalk 150. Despite being installed in a confined area, hatch door 202 can translate between the closed, “compressed” position (FIG. IB), and the open position (FIGs. 1C and ID), and vice-versa.

[0054] Further, the low-profile design of the hatch door 202 allows it to be opened and closed without impeding the motion of the surrounding systems, e.g., the fill system 108. This is because the hatch door 202 does not include a swinging door that acts as an obstruction in the open position.

[0055] As still further described herein, hatch door 202 is translatable into, and out of, the closed and compressed position, without necessitating the use of large linkages to secure the hatch door in the closed, compressed position. Rather, the hatch door 202 relies on uniquely configured linkages that occupy relatively minimal space around the hatch door 202.

[0056] In more detail, as best shown in FIG. 2A, the disclosed compression hatch door 202 broadly includes four (4) components: (i) a moveable covering member 204, for opening and closing the tank opening 250; (ii) one or more translation assemblies 504, for effecting translation of thecovering member 204 between the various open and closed positions; (iii) at least one actuator 210, for actuating the translation; and (iv) at least one rotatable linkage 560, coupling together each of these three components, e.g., the covering member 204, translation assembly 504, and the actuator(s) 210. The hatch door 202 can also include one or more catch members 590, which limit axial movement of the door, and trigger rotation of the rotatable linkage(s) 560.III. MOVEABLE COVERING MEMBER

[0057] Covering member 204 is used to cover and un-cover the tank opening 250, in the closed and open positions, respectively, as well as to seal over the tank opening 250 in the closed, “compressed” position.

[0058] Reference is made to FIG. 5A - 5B, exemplifying the covering member 204 used in the hatch design 202 of FIGs. 2 - 4.

[0059] Concurrent reference is also made to FIG. 10 A, exemplifying the covering member 204 used in the hatch design of FIGs. 6 - 8.

[0060] As best exemplified in FIGs. 5A and 5B, the covering member 204 includes an upper end 404a and a lower end 404b (see also FIG. 10 A). In some examples, the ends are axially spaced apart along an axis parallel to compression axis 252b. When the covering member 204 is in the closed position, the lower end 404b (e.g., lower surface) is directed towards, and covers over, the tank opening 250 (FIG. 12).

[0061] Covering member 204 also extends between a forward end 550a and a rear end 550b (FIGs. 5A - 5B and 10A). In some examples, the forward and rear ends 550a, 550b extend parallel to the translation axis 252a. When the covering member 204 is in the open position (FIGs. 2A - 2B and 6A - 6C), the forward end 550a is directed towards the tank opening 250.

[0062] As used herein throughout, the “forward” direction refers, along translation axis 252a, to a direction facing towards the tank opening 250. In contrast, the “rearward” direction refers, along translation axis 252a, to a direction facing away from the tank opening 250. Accordingly, coveringmember 204 is translated forwardly to close the tank opening 250, and rearwardly to open the tank opening 250.

[0063] Covering member 204 can also have any size, shape or configuration known in the art.

[0064] In at least one example, the covering member 204 has an overall cross-sectional surface area - at least along its lower surface 404b - that is at least as equal to the area of tank opening 250. In this manner, the covering member 204 is able to fully cover over the tank opening 250 in the closed position.

[0065] The covering member 204 may also have a general cross-sectional shape (e.g., rectangular) - again, at least along its lower surface 404b - that complements the cross-sectional design of the tank opening 250, e.g., to ensure a closing fit.

[0066] In some examples, the lower surface 404b, of covering member 204, may include a seal 412 (FIG. 2A), e.g., a rubber seal. In the closed and “compressed” position (FIGs. 4A - 4B), the seal allows an airtight pressurization of the tank 104. Alternatively, or in addition, a seal 412 can be provided directly on the tank frame 206 (FIG. 11), e.g., surrounding the tank opening 250.

[0067] While the covering member 204 is exemplified as being a single component, it is appreciated that covering member 204 can also comprise multiple sub-components that are coupled together to form a single integrated covering member.IV. EXAMPLE TRANSLATION ASSEMBLY

[0068] At a broad level, the translation assembly 504 translates the covering member 204 forwardly and rearwardly, along translation axis 252a, as between: (i) the open position (FIGs. 2A - 2B and FIGs. 6A - 6C); and (ii) the intermediate closed, “uncompressed” position (FIGs. 3 A - 3B and FIGs. 7A - 7B).

[0069] As best exemplified in FIG. 2A, the translation assembly 504 couples in-directly, to the covering member 204, via at least one rotatable linkage 560. The interaction between the covering member 204, rotatable linkage(s) 560 and translation assembly 504, is explained in greater detail, below.

[0070] To this end, any number of translation assemblies 504 may be provided in the hatch 202. For instance, the example hatch 202 of FIGs. 2 - 4 uses only a single translation assembly 504, which is coupled (via rotatable linkage 560) to covering member 204 (see e.g., FIG. 2A).

[0071] In contrast, FIGs. 6 - 8 exemplify a hatch 202 that includes two translation assemblies 504 (see e.g., FIG. 10A). In some cases, using more than one translation assembly 504 facilitates translating larger sized and / or heavier covering members 204.

[0072] The translation assembly 504 may also comprise any suitable mechanism that facilitates linear translatory motion, e.g., along translation axis 252a. In the illustrated examples, each translation assembly 504 comprises a wheel s-on-track design.

[0073] For instance, in the exemplified hatch 202 of FIGs. 2 - 4, the translation assembly 504 includes a wheel 510 (e.g., a V-wheel) (FIG. 2B) that rolls (and / or slides) over a track 212 (e.g., V- groove track or rod). Track 212 may extend substantially parallel to the translation axis 252a, and adjacent the tank opening 250, such as to enable axial translation of covering member 204 between the open position (FIGs. 2A and 2B), and the intermediate closed, “uncompressed” positions (FIGs. 3A and 3B).

[0074] An appreciated advantage of using V-wheels on a V-groove track is that the V-wheels mate with the track 212. This, in turn, results in a more robust engagement between the two elements, which minimizes the likelihood that the wheel 510 dislocates from the track 212. A V-groove track also has sloped / angled sides (e.g., sides angling downwardly, in the direction of the tank opening 250). This sloped design helps minimize product build-up over the track 212. Product (e.g., fertilizer) is prone to slide-off the sloped sides, ensuring that build-up does not impede motion of the wheel 510.

[0075] As used herein throughout, the “downward” direction refers to a direction, along compression axis 252b, facing towards the tank opening 250. Further, an “upward” direction refers to a direction facing away from the tank opening 250. It is understood, however, that these terms are used only for ease of explanation, and that the hatch 202 is not limited to any particular orientation.

[0076] In examples where the translation assembly 504 uses the wheel-on-track design, each assembly 504 can include any number of wheels 510. For example, in FIGs. 2 - 4, the translation assembly 504 includes a single wheel 510. In contrast, in FIGs. 6 - 8 (and as best exemplified in FIG. 10B), the translation assembly 504 can include two wheels 510. If more than one wheel 510 isprovided, the wheels 510 may be axially spaced apart (e.g., along an axis parallel to translation axis 252a). It is also possible that each wheel 510 can run on a separate track 212. In some cases, using more than wheel 510 may, again, facilitate translation of larger sized and / or heaving covering members 204.

[0077] As best shown in FIGs 10A and 10B, if more than one wheel 510 is provided in translation assembly 504, the wheels 510 may be rotatably coupled, and retained, to a wheel frame 514 (FIGs. 10A - 10B). Frame 514 may extend, for instance, between a forward end 514a and a rearward end 514b (FIG. 10A), and may extend substantially parallel to a lateral side 502a, 502b of covering member 204.

[0078] While the illustrated embodiments exemplify translation assemblies 504 that use a wheel s-on-track design, it will be understood that any other translation mechanism known in the art may be employed. For example, this can include any sliding and / or rolling mechanism known to the skilled artesian (e.g., a sliding track design).

[0079] Irrespective of the design of the translation assembly 504, each assembly 504 may include at least a moveable portion 520 and a static portion 522.

[0080] The moveable portion 520 defines the portion of the assembly 504, that translates axially, and thereby moves the covering member 204. For instance, in FIGs. 2 - 4, the movable portion 520 comprises the wheel 510 (FIG. 2B). In FIGs. 6 - 10, the moveable portion 520 comprises the entirety of the wheels 510 rotatably fixed onto the wheel frame 514 (FIG. 10B), as it is the entirety of the wheel frame 514 that is being axially moved.

[0081] In contrast, the static portion 522 is the portion of the translation assembly 504 which remains immoveable, e.g., track 212 (FIGs. 2B and 10B). In some examples, the static portion 522 is integrated with the air cart tank, itself.

[0082] As noted previously, each translation assembly 504 couples in-directly to the covering member 204, via one or more rotatable linkages 560. More generally, the rotatable linkage(s) 560 couple to the movable portion 520 - rather than the static portion 522 (e.g., track 212) - of each translation assembly 504. This allows the linkage(s) 560 to axially translate (e.g., move) the movable portion 520 of the assembly 504, and thereby move the covering member 204. As explained further below, there may be any number of rotatable linkages 560.

[0083] By way of example, in FIGs. 2 - 4, translation assembly 504 couples to rotating linkage 560, via the rotating wheel 510 (i.e., the movable portion 520). In FIGs. 6 - 10, each translation assembly 504 couples to rotatable linkage(s) 560, via the wheel frame 514 (i.e., the movable portion 520). The rotatable linkage(s) 560 are then, in turn, coupled to the covering member 204, as explained herein.V. ROTATABLE LINKAGE(S)

[0084] One or more rotatable linkages 560 (FIGs. 2A and 6C) are used for coupling the covering member 204 to translation assembly 504.

[0085] In use, each rotatable linkage 560 operates to provide two general functions:

[0086] First, the linkages 560 are used to axially translate the covering member 204, along translation axis 252a, between the opened and closed positions.

[0087] For example, in FIGs. 2 - 3, an actuator 210 is attached to the linkage 560, and applies an axial force to the linkage 560. Because linkage 560 is coupled to both the translation assembly 504 and covering member 204 - the axial force applied to linkage 560 allows the wheel 510 to slide, and thereby moves the covering member 204 between: (i) the initial open position (FIGs. 2A - 2B and 6A- 6C), and (ii) the intermediate closed, “un-compressed” position (FIGs. 3A - 3B and 7A - 7B). During this translation process, the rotatable linkage 560 does not substantially rotate.

[0088] Second, once the covering member 204 is axially translated into the intermediate closed, “un-compressed” position (FIGs. 3 A - 3B and 7A - 7B) - the rotatable linkage(s) 560 are used for further “compressing” the covering member 204 into the final closed, “compressed” position (FIGs. 4A - 4B and FIGs. 8A - 8B). Alternatively, if the covering member 204 is being opened, the rotating linkage(s) 560 are used for “uncompressing” the covering member 204, and moving the member from the closed “compressed” position, into the closed “uncompressed” position.

[0089] Any number of rotatable linkage(s) 560 may be provided in the hatch 202. In FIGs. 2- 4, only a single rotatable linkage 560 is provided (FIG. 2A). In other instances, more than one (e.g., a plurality) of rotatable linkages 560 are provided. For instance, in FIGs. 6 - 10, four linkages 560 areprovided, and couple to each comer of the covering member 204 (e.g., FIG. 10B). The use of more than one linkage 560 may be advantageous for larger sized or heavier door designs.

[0090] As best exemplified in FIGs. 5C - 5D, each rotating linkage 560 includes at least three (3) couplings: (i) a first rotatable coupling 560a, for the translation assembly 504 (also referred to herein as the “translation and pivoting coupling”); (ii) a second rotatable coupling 560b, for the actuator 210 (also referred to herein as the “actuator coupling”); and (iii) a third rotatable coupling 560c, for the covering member 204 (also referred to herein as the “covering member coupling”).

[0091] Translation and pivoting coupling 560a rotatably couples linkage 560 to the movable portion 520 of the translation assembly 504. For example, in FIG. 2B, linkage 560 is rotatably coupled to the wheel 510 (i.e., the movable portion 520), via the coupling 560a. In FIG. 10B, one or more linkages 560 are rotatably coupled to the wheel frame 514 (i.e., the movable portion 520), via the coupling 560a. In this manner, the linkage 560 as a whole translates with the translation assembly 504.

[0092] Actuator coupling 560b rotatably couples the linkage 560 to the actuator 210. This enables the actuator 210 to apply an axial force (e.g., rearwardly or forwardly, in the direction of translation axis 252a) to the linkage 560. In turn, the linkage 560 can move the translation assembly 504 and covering member 204. Actuator coupling 560b may allow the actuator 210 to rotate, about rotation axis 572a, relative to linkage 560 (FIG. 2A).

[0093] Actuator 210 may be coupled directly or in-directly to the linkage 560. For example, in FIGs. 2 - 4, the linkage 560 is coupled directly to actuator 210. In other examples, the actuator 210 is coupled in-directly to the linkage 560 (FIGs. 6 - 10). For instance, as shown in FIG. 8B, an actuator coupling element 410 is used to concurrently and in-directly couple the actuator 210 to one or more linkages 560.

[0094] Covering member coupling 560c rotatably couples linkage 560 to covering member 204. As explained below, this allows linkage 560 to translate the covering member 204 between various open and closed positions. More generally, covering member 204 rotates, about rotation axis 572b (FIGs. 2A), relative to linkage 560.

[0095] To this end, linkage 560 can rotatably couple to any area of, or in any manner to, the covering member 204. For example, in FIGs. 2A and 10B, an extended portion 574, extends from one or both lateral sides 502a, 502b of the covering member 204, and rotatable engages linkage 560.

[0096] In use, the rotatable linkage 560 pivots - about the pivoting coupling 560a - between an unrotated position (FIG. 5C) and a rotated position (FIG. 5D). As exemplified in FIG. 4A, this pivoting occurs along a pivoting axis 562, intersecting pivoting coupling 560a. In some examples, pivoting axis 562 (as well as rotation axes 572a, 572b) are generally orthogonal to both translation and compression axes 252a, 252b.

[0097] In the rotated position (FIG. 5D), the linkage 560 pushes the covering member 204 downwardly (i.e., along compression axis 252b) into the closed, “compressed” position (see FIGs. 4A - 4B, 8A - 8B, 5B and 9B).

[0098] Alternatively, in the unrotated position (FIG. 5C), linkage 560 rotates to “lift” the covering member 204 above tank opening 250, such that it is no longer compressed (FIGs. 3 A - 3B, 7A - 7B, 5A and 9A).

[0099] The linkage 560 is maintained in the unrotated position (FIG. 5C) while the covering member 204 is translated axially between the open position (FIGs. 2A - 2B and 6A - 6C) and the closed, “uncompressed” position (FIGs. 3 A - 3B and 7A - 7B). This allows the covering member 204 to be lifted-up, and to “hover” over the tank opening 250, such that it can slide over and off the tank opening 250. Linkage 560 is then pivoted into the rotated position (FIG. 5D) when it is then desired to push or compress the covering member 204 into the closed, “compressed” position, thereby sealing the tank opening 250 (FIGs. 4A - 4B and 8A - 8B).

[0100] To better explain operation of the rotating linkage 560, reference is made to FIGs. 5C and 5D, which illustrates a side view of the linkage 560.

[0101] As exemplified in these figures, the rotatable couplings 560a - 560c are aligned along two separate axes 566a, 566b. The first and second couplings 560a, 560b are aligned along a first coupling axis 566a, while the first and third couplings 560a, 560c are aligned along a second coupling axis 566b. Coupling axes 566a, 566b may be defined in a plane orthogonal to translation axis 252a (FIG. 2A).

[0102] The first and second coupling axis 566a, 566b are angularly offset by angle (9) 568, e.g., to form a “V-shape” configuration. In at least one example, the offset angle 568 is defined in a range of 0°< 9 <180°, and in some examples, 45 °< 9 < 90°.

[0103] The advantage of this angular offset is that, when the linkage 560 is pivoted about pivot560c into the rotated position (FIG. 5D), the covering member coupling 560c translates downwardly (see dotted arrow in FIG. 5D), e.g., along an axis parallel to compression axis 252b.

[0104] As a result, and as best shown in FIGs. 4A - 4B and FIGs. 8A - 8B, in the rotated position (FIG. 5D), the covering member coupling 560c is able to push the covering member 204 downwardly into the closed, “compressed” position.

[0105] In the reverse case, when linkage 560 is unrotated (FIG. 5C), then the covering member coupling 560c translates upwardly (see dotted arrow in FIG. 5C), thereby “lifting” the covering member 204 back into the closed, “uncompressed” position. In this position, the covering member 204 is hovering over the tank opening 250 (e.g., see hovering elevation 582 in FIG. 5A).

[0106] As described below, an important appreciated advantage of the exemplified linkage design is that it does not require separate actuator mechanisms to affect: (i) the linear, and (ii) compressive motions of covering member 204. Rather, a single actuator 210 is used to linearly translate covering member 204 between the open and closed positions, while also compressing / uncompressing the covering member 204 using rotatable linkage(s) 560.

[0107] While FIGs. 5C - 5D exemplifies the three couplings 560a - 560c as forming an upwardly directed “V-configuration” - in other examples, the same principle is accomplished using a downwardly directed “V-configuration”. That is, offset angle 568 is directed downwardly, rather than upwardly.

[0108] Linkage 560 may also have any suitable design, while accomplishing the same function. For instance, in FIGs. 5C and 5D, the linkage 560 itself is V-shaped, which accommodates the three rotatable couplings 560a - 560c. However, FIGs. 5E - 5F exemplify a different design, using a circular plate, which still includes the three rotatable couplings 560a - 560c along different axis. In still other examples, the linkage 560 can have a semi-circular or quarter-plate design, as desired.VI. CATCH STRUCTURES

[0109] Referring to FIG. 2A, the compression hatch 202 may further include a catch structure590.

[0110] The purpose of the catch 590 is two-fold: (i) first, to limit further axial movement of the covering member 204, along translation axis 252a. That is, to prevent further movement from the open position (FIGs. 2A - 2B) to the closed, “un-compressed” position (FIGs. 3A - 3B); and (ii) second, to trigger the rotatable linkage 560 to pivot (as explained above) between the unrotated position (FIG. 5C) and the rotated position (FIG. 5D). In turn, this translates the covering member 204 between the closed, “uncompressed” position and the closed, “compressed” position.

[0111] To this end, catch 590 is positioned to prevent (e.g., block) further axial movement of the movable assembly portion 520. In the exemplified embodiments, catch 590 is positioned in-line with the translation assembly 504. In this manner, the catch 590 is positioned to engage the movable portion 520 of the translation assembly 504 (e.g., wheel 510 in FIG. 3B).

[0112] As used herein, the element which engages the catch 590 is termed the “limiting element” 1004. Accordingly, the movable assembly portion 520 comprises the limiting element 1004 in FIGs. 3 A, 3B.

[0113] In FIGs. 3A - 3B, the catch 590 is positioned along the static assembly portion 522 (e.g., track 212), and in the path of movable assembly portion (e.g., rotating wheel 510). In this position, the movable assembly portion 520 (e.g., wheel 510) engages catch 590 when covering member 204 is fully translated into the closed, “un-compressed” position (FIGs. 3A, 3B). This prevents further axial movement of wheel 510, and by extension, the covering member 204 (FIGs. 4A - 4B) when it is hovering over tank opening 250.

[0114] FIGs. 6 - 11 exemplify another configuration for the interaction between the catch 590 and the translation assembly 504. This design may be better adapted for larger hatch doors 202.

[0115] As shown in FIG. 11, one or more catches 590 are provided in the hatch 202. Each catch 590 is, again, positioned in-line with the translation assembly 504. For example, two opposing pairs of catches 590 (e.g., four catches 590) are provided along each track 212, and on either side of the track 212. In other examples, any number of catches 590 are provided along each track 212 (e.g., one, two, three, etc.), and in any arrangement. Catches 590 can be mounted, for example, to the tank opening frame 206.

[0116] As illustrated in FIG. 10A, the translation assemblies 504 include one or more stopping tabs 512. Similar to FIGs. 3 A and 3B, these stopping tabs 512 also form part of the moveable assemblyportion 520 (e.g., wheel frame 514 with wheels 510), of translation assembly 504. The stopping tabs 512 may be disposed, for example, along an outer lateral surface of the wheel frame 514 (FIG. 10A).

[0117] Stopping tabs 512 are positioned to engage corresponding catches 590 (FIG. 11). In this manner, the stopping tabs 512 function as the limiting elements 1004 in the example of FIGs. 6 - 11. This is best exemplified in FIGs. 7A and 7B: as shown, when the compression hatch 202 is axially translated into the closed, “uncompressed” position, the stopping tabs 512 engage the corresponding catches 590 (see also FIG. 8B). In turn, this prevents further axial movement of covering member 204 (along translation axis 252a).

[0118] In at least one example, the wheel frame 514 - of translation assembly 504 - can include indented guiding elements 1002 (e.g., tabs or the like) (FIG. 10A). In the illustrated example, guiding elements 1002 extend from a forward portion 514a of the translation assembly 504. In use, the guiding elements 1002 operate to guide the translation assembly 504 to slide between the forward pair of catches 590 (FIG. 11). This allows the stopping tabs 512 to properly engage the catches 590.

[0119] It will be appreciated that, in FIGs. 6 - 11, any other portion of the movable portion 520, of translation assembly 504, can also be used as the limiting element 1004 to prevent further translation.

[0120] For instance, in addition or alternatively to using the stopping tabs 512 - the rotating wheels 510 (FIG. 10B) may also directly engage the catches 590. For example, the front wheels 510, on each translation assembly 504, can engage a respective catch 590. This is similar to the design of FIGs. 2 - 4. In this case, the wheels 510 would form the limiting element 1004, which engages the catches 590.

[0121] In other examples, it is not necessary that the catch 590 is positioned along the path of the translation assembly 504, and / or that the limiting elements 1004 forms part of the movable translation assembly 504, as exemplified.

[0122] For example, the catch 590 can be positioned at any other location to prevent further axial motion of the covering member 204. For instance, any other portion of hatch 202 may form the limiting element 1004 that engages the catch 590. For example, the covering member 204 may be the limiting element 1004, and the catch 590 can be installed on the tank frame 206 to engage the covering member 204.

[0123] Irrespective of how the catch(es) 590 engages with the limiting element(s) 1004, once the catch 590 is engaged - any further axial force applied by actuator 210 does not move the covering member 204 forward, but rather, triggers (e.g., causes) pivoting of the rotating linkages 560 (FIGs. 4A - 4B and FIGs. 8A - 8B) into the rotated position (FIG. 5D). In turn, the covering member 204 is translated from closed, “uncompressed” potion (FIG. 5 A), and into the closed, “compressed” position (FIG. 5B).

[0124] As shown in FIG. 3B, in some examples, the catch structure 590 may include two portions: (i) a limiting portion 592; and (ii) a retaining overhang portion 594 (see also FIG. 8B).

[0125] Limiting portion 592 functions to prevent (e.g., limit) further axial motion of the covering member 204, along translation axis 252a. For example, the limiting portion 592 can include a surface that extends along an axis, generally parallel to compression axis 252b (FIG. 3B), to thereby prevent further axial translation. The limiting portion 592 engages the limiting element 1004 (e.g., wheel 510 and / or stopping tabs 512) to prevent further axial motion.

[0126] In contrast, the retaining overhang portion 594 functions to further minimize (e.g., prevent) displacement of the covering member 204, when the hatch 202 is in the closed, “compressed” position.

[0127] For example, in FIG. 4A, in the closed and “compressed” position, the overhang portion 594 extends over the wheel 510. Similarly, in FIG. 8B, overhang portion 594 extends over the stopping tab 512.

[0128] To this end, overhang portion 594 may extend generally parallel to translation axis 252a. In turn, overhang portion 594 minimizes movement of the covering member 204 and / or limiting element 1004 along an axis, parallel to compression axis 252b (see e.g., FIGs. 4A, 4B).

[0129] At a general level, there are a few appreciated advantages to including the overhang portion 594.

[0130] First, it retains the hatch door 202 in the closed, “compressed” position. That is, it counteracts the upward force that the compressed seal 412 (e.g., the seal surrounding covering member 204 and / or tank opening 250), applies while the hatch 202 is in the closed, “compressed” position. More generally, the overhang portion 594 may ensure that the covering member 204 does not openinadvertently due to the higher pressure inside the pressurized tank, as compared to the lower ambient pressure.

[0131] Second, overhang portion 594 also ensures that the hatch door 202 is locked into the closed, “compressed” position, despite the normal bouncing and oscillation the air cart experiences, e.g., while working on rough terrain. Vibrations of this type may be unpredictable, and therefore, the retaining overhang 512 ensures no unintended movements of the hatch door 202.

[0132] Third, it facilitates the covering member 204 transitioning from the closed, “compressed” position, to the closed, “uncompressed” position (e.g., during opening when the door is being uncompressed).

[0133] During this opening / uncompressing transition, the translational assembly 504 cannot move axially along translation axis 252a. If the covering member 204 is axially moved, the seal 412 may be damage due to the shearing force, and may consequently tear. Accordingly, the overhang portion 594 ensures that the translational assembly 504 remains fixed until the seal 412 is fully decompressed, at which point the translational assembly 504 shifts downward slightly and disengages. Then it is free to translate to the open state.

[0134] While the exemplified design illustrates the limiting portion 592 and the overhang portion 594, of catch 590, as forming a single integrated continuous member - it is also possible that these portions form separate and distinct parts of catch 590. Further, in examples where more than one catch 590 is provided, it is not necessary that each catch 590 include both the limiting and overhang portions 592, 594. In some examples, only the limiting portion 592 is provided in each catch 590, without the overhang portion 594.VII. LINEAR ACTUATOR MECHANISM

[0135] As detailed above, the covering member 204 may be in-directly coupled to at least one actuator 210. The actuator 210 operates to translate the covering member 204 between: (i) the openposition (FIG. 2A - 2B and 6A - 6C); (ii) closed, “uncompressed” position (FIGs. 3 A - 3B and 7A - 7B); and (iii) closed, “compressed” position (FIGs. 4A - 4B and 8A - 8B).

[0136] Actuator 210 couples (directly, or in-directly) to the one or more rotatable linkages 560, at the actuator coupling 560b (FIGs. 5C and 5D).

[0137] For instance, in FIGs. 2 - 4, the actuator mechanism 210 couples directly to the linkage 560. In FIGs. 6 - 11, actuator 210 is coupled in-directly to at least one coupling element 410 (FIGs. 8 A - 8B), which allows the actuator 210 to couple concurrently to the plurality of rotatable linkages 560. This design may be better adapted for hatches 202 that include more than one rotatable linkage 560 that need to be coupled to the same actuator 210.

[0138] In use, when it is desired to close the hatch 202, actuator 210 applies a forward axial force, along translation axis 252a, to move the covering member 204 between: (i) the open position (FIG. 2A - 2B and 6A - 6C); and (ii) the closed, “uncompressed” position (FIGs. 3 A - 3B and 7A - 7B). This axial force is applied to the one or more rotatable linkages 560, which in turn, are coupled to the movable portion 520 of the translation assemblies 504 (e.g., wheels 510 and / or wheel frame 514).

[0139] Once in the closed, “uncompressed” position - the covering member 204 is prevented from further axial movement owing to the catches 590. In this position, the actuator 210 can continue to apply an axial force, in the same direction along translation axis 252a, which causes the rotating linkages 560 to pivot into the rotated position (FIG. 5D). In turn, this causes the covering member 204 to further translate along compression axis 252b from: (i) the closed, “uncompressed” position (FIGs. 3 A - 3B and 7A - 7B); to (ii) the closed, “compressed” position (FIGs. 4A - 4B and 8A - 8B).

[0140] When it is desired to open the tank opening 250, the process is reversed and the actuator 210 applies a reverse (e.g., rearward) axial force in the opposite direction, along translation axis 252a.

[0141] To this effect, there are at least three advantages to the disclosed hatch door with actuator design:

[0142] First, only a single actuator 210 is required to both translate the hatch 202 to the closed position, along translation axis 252a; and further, compress the hatch 202 along the orthogonal compression axis 252b. This is contrasted to other designs, where two or more actuators are needed for each of the translation and compressive movements.

[0143] Second, the actuator 210 can operate in a single continuous motion to affect both the translative and compressive motions. That is, the motion path of the actuator 210 does not need to be disrupted to transition from a translative, to a compressive force.

[0144] Third, the single actuator 210 can apply an axial force in a single axial direction (e.g., along translation axis 252a), and along a single movement plane, to affect both the translative and compressive movements, and vice-versa. This is contrasted to other designs, where at least two actuators are needed to effect forward translative motion, followed by downward compressive motion (or vice-versa).

[0145] Any suitable actuator mechanism can be employed in the hatch door 202. In the illustrated example, the actuator 210 comprises an extending piston assembly. As shown in FIGs. 6B and 6C, the piston assembly 210 includes a piston housing 220, which retains an extendable piston rod 222. As known the art, the piston rod 222 extends from the housing 220 to exert forward axial force.

[0146] In this example, a distal end 222a of the piston rod 222 is rotatably coupled to the actuator coupling element 410. Further, an opposing end 220a of the piston housing 220 is rotatably coupled to a securing structure 602. As shown in FIG. 12, securing structure 602 can couple, for example, to the tank opening frame 206.

[0147] As noted above, in use, the piston rod 222 extends to push the covering member 204 into the closed, “un-compressed” position. Once in the closed and un-compressed position, the door assembly 204 is prevented from further axial movement by the catches 590. However, the piston rod 222 is dimensioned to continue to extend axially forward (e.g., continue its stroke) such as to rotate the linkages 560, and compress tank seal 412.

[0148] In other examples, any other design for an actuator 210 can be used to apply the axial force. For example, rather than a pushing piston design, a pulling piston design can be used. In other examples, the actuator 210 can have a gear and ratchet design. In still other examples, the actuator 210 may simply be an extended rod (FIGs. 2 - 4), which is mechanically pushed and pulled (e.g., by a user).

[0149] While a single actuator 210 is exemplified, it is also possible to include multiple actuators 210. For example, multiple actuators can be provided to apply the necessary axial force.VIII. INTERPRETATION

[0150] Various systems or methods have been described to provide an example of an embodiment of the claimed subject matter. No embodiment described limits any claimed subject matter and any claimed subject matter may cover methods or systems that differ from those described below. The claimed subject matter is not limited to systems or methods having all of the features of any one system or method described below or to features common to multiple or all of the apparatuses or methods described below. It is possible that a system or method described is not an embodiment that is recited in any claimed subject matter. Any subject matter disclosed in a system or method described that is not claimed in this document may be the subject matter of another protective instrument, for example, a continuing patent application, and the applicants, inventors or owners do not intend to abandon, disclaim or dedicate to the public any such subject matter by its disclosure in this document.

[0151] Furthermore, it will be appreciated that for simplicity and clarity of illustration, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein may be practiced without these specific details. In other instances, well-known methods, procedures and components have not been described in detail so as not to obscure the embodiments described herein. Also, the description is not to be considered as limiting the scope of the embodiments described herein.

[0152] It should also be noted that the terms “coupled” or “coupling” as used herein can have several different meanings depending in the context in which these terms are used. For example, the terms coupled or coupling may be used to indicate that an element or device can electrically, optically, or wirelessly send data to another element or device as well as receive data from another element or device. As used herein, two or more components are said to be “coupled”, or “connected” where the parts are joined or operate together either directly or indirectly (i.e., through one or more intermediate components), so long as a link occurs. As used herein and in the claims, two or more parts are said to be “directly coupled”, or “directly connected”, where the parts are joined or operate together without intervening intermediate components.

[0153] It should be noted that terms of degree such as "substantially", "about" and "approximately" as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. These terms of degree may also be construed as including a deviation of the modified term if this deviation would not negate the meaning of the term it modifies.

[0154] Furthermore, any recitation of numerical ranges by endpoints herein includes all numbers and fractions subsumed within that range (e.g. 1 to 5 includes 1, 1.5, 2, 2.75, 3, 3.90, 4, and 5). It is also to be understood that all numbers and fractions thereof are presumed to be modified by the term "about" which means a variation of up to a certain amount of the number to which reference is being made if the end result is not significantly changed.

[0155] The present invention has been described here by way of example only, while numerous specific details are set forth herein in order to provide a thorough understanding of the exemplary embodiments described herein. However, it will be understood by those of ordinary skill in the art that these embodiments may, in some cases, be practiced without these specific details. In other instances, well-known methods, procedures and components have not been described in detail so as not to obscure the description of the embodiments. Various modification and variations may be made to these exemplary embodiments without departing from the spirit and scope of the invention, which is limited only by the appended claims.

Claims

CLAIMS:

1. A low-profile compression hatch door for an air cart tank, comprising: at least one rotatable linkage; a covering member for covering an opening of the air cart tank, the covering member being coupled to the at least one rotatable linkage through a first rotatable coupling; at least one translation assembly for translating the covering member, and coupled to the at least one rotatable linkage through a second rotatable coupling; an actuator mechanism being coupled to the at least one rotatable linkage, through a third rotatable coupling, wherein the actuator mechanism is configured to apply a linear axial force, along a translation axis, to the at least one rotatable linkage, in order to translate the covering member between: (i) an open position, (ii) an intermediate closed, un-compressed position, and (iii) a closed, compressed position.

2. The hatch door of claim 1, wherein upon applying the linear axial force to the at least one rotatable linkage using the actuator mechanism, the at least one translation assembly moves along the translation axis to translate the covering member between (i) the open position, and (ii) the intermediate closed, un-compressed position.

3. The hatch door of claims 1 or 2, further comprising one or more catch members positioned to prevent forward axial movement of the covering member, along the translation axis, when the covering member is in a closed position.

4. The hatch door of claim 3, wherein the one or more catch members engage one or more corresponding limiting elements of the hatch door when the covering member is translated forwardly into the intermediate closed, un-compressed position.

5. The hatch door of claim 4, wherein at least one, of the one or more catch members, comprises a retaining overhang portion, that hangs over the limiting element when the limiting element is engaged with the catch member.

6. The hatch door of any one of claims 4 or 5, wherein when the limiting elements are engaged with the catch members, further forward linear axial force applied by the actuator mechanism, along the translation axis, triggers the at least one rotatable linkage to pivot, about a rotation axis intersecting the second coupling, from an unrotated position to a rotated position, wherein, in the rotated position, the at least one rotatable linkage translates the covering member, along a compression axis from, (i) the intermediate closed, un-compressed position, to (ii) the closed, compressed position.

7. The hatch door of claim 6, wherein the at least one rotatable linkage is in the unrotated position while the covering member is being translated between, (i) the open position, and (ii) the intermediate closed, un-compressed position, wherein, in the unrotated position, the at least one rotatable linkage raises or lifts the covering member over the tank opening, along the compression axis.

8. The hatch door of any one of claims 1 to 7, wherein the first and second rotatable couplings are aligned along a first coupling axis, and the second and third rotatable couplings are aligned along a second coupling axis, wherein the first and second coupling axis are offset by an angle, and the second rotatable coupling is located at the intersection of the two axis.

9. The hatch door of anyone of claims 1 to 8, wherein the at least one translation assembly comprises a moveable assembly portion and a static assembly portion, wherein the at least one rotatable linkage is rotatably coupled, via the second rotatable coupling, to the moveable assembly portion.

10. The hatch door of claim 9, wherein the moveable assembly portion comprises one or more rotatable wheels, and the static assembly portion comprises a track, and the one or more wheels rotate or slide over the track.

11. The hatch door of claims 9 or 10, wherein the moveable assembly portion comprises a wheel frame that retains the one or more wheels.

12. The hatch door of claim 11, as it depends on claims 4 or 5, wherein the one or more catch members are positioned along the track, and the limiting element comprises at least one wheel, of the one or more wheels.

13. The hatch door of claim 10, as it depends on claims 4 or 5, wherein one or more catch members are positioned adjacent the track, and the limiting element comprises stopping tabs disposed on one or more lateral surfaces of the wheel frame.

14. The hatch door of any one of claims 1 to 13, wherein the actuator mechanism is configured to move the covering member between the positions (i) and (iii), in a single continuous linear motion along the translation axis.

15. The hatch door of any one of claims 1 to 14, wherein in the closed and compressed position, the covering member seals the tank opening such that the air inside the tank volume is pressurized.

16. An air cart comprising: an air cart tank having a tank opening for accessing an inner volume of the tank; and- the low-profile compression hatch door, according to any one of claims 1 to 15, for opening and closing the tank opening.

17. An air cart tank comprising: a tank opening to access an inner volume of the tank; and- the low-profile compression hatch door, according to any one of claims 1 to 15, for opening and closing the tank opening.

18. A method for operating a low-profile compression hatch door for an air cart tank, comprising:operating an actuator mechanism to apply a linear axial force, along a translation axis, to at least one rotatable linkage in order to translate a covering member of the hatch door between: (i) an open position, (ii) an intermediate closed, un-compressed position, and (iii) a closed, compressed position, wherein the actuator mechanism is coupled to the at least one rotatable linkage through a first rotatable coupling, and the covering member is coupled to the at least one rotatable linkage through a second rotatable coupling.

19. The method of claim 18, wherein upon applying the linear axial force to the at least one rotatable linkage using the actuator mechanism, an at least one translation assembly moves along the translation axis to translate the covering member between (i) the open position, and (ii) the intermediate closed, un-compressed position, wherein a third rotatable coupling is formed between the at least one translation assembly and the at least one rotatable linkage.

20. The method of claim 19, wherein upon applying the linear axial force to the at least one rotatable linkage using the actuator mechanism, the at least one rotatable linkage pivots, about a rotation axis intersecting the third rotatable coupling, between an unrotated position and a rotated position,

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