Patent ID: 12228380

Example embodiments are shown and described in sufficient detail to enable those of ordinary skill in the art to embody and implement the systems and processes herein described. It is important to understand that embodiments can be provided in many alternate forms and should not be construed as limited to the examples set forth herein.

Accordingly, while embodiments can be modified in various ways and take on various alternative forms, specific embodiments thereof are shown in the drawings and described in detail below as examples. There is no intent to limit to the particular forms disclosed. On the contrary, all modifications, equivalents, and alternatives falling within the scope of the appended claims should be included. Elements of the example embodiments are consistently denoted by the same reference numerals throughout the drawings and detailed description where appropriate. The invention is not limited in the design and shape of the structure shown in the drawings.

The terminology used herein to describe embodiments is not intended to limit the scope. The articles “a,” “an,” and “the” are singular in that they have a single referent, however the use of the singular form in the present document should not preclude the presence of more than one referent. In other words, elements referred to in the singular can number one or more, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises,” “comprising,” “includes,” and/or “including,” when used herein, specify the presence of stated features, items, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, items, steps, operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein are to be interpreted as is customary in the art. It will be further understood that terms in common usage should also be interpreted as is customary in the relevant art and not in an idealized or overly formal sense unless expressly so defined herein.

The working component of the clearance device members comprises three elements: the front plate (1), the top link (2), and the bottom link (3). This is also a latch (4) which locks the mechanism. These are mounted in a row, to a chassis (5). In this embodiment the chassis is common to all members in a row; in other embodiments separate chassis plates could be provided for each member. In some embodiments the chassis could also be considered as an element.

Each element of a member is connected to its neighbour by a hinge, creating, together with the chassis, a 4-bar linkage which can fold away into a small package against the chassis or fold out into its working configuration when required. One or more of these row assemblies form a straight or V shaped clearance blade which is attached to a host vehicle by a suitable support structure. This structure is able to move the blade assembly between a stowed and a deployed position and when deployed the support structure allows some movement of the blade assembly relative to the vehicle to enable it to contour the ground.

In this embodiment the linkage is arranged so that the front plate path (locus) is able to contour sharp steps, uneven ground, and changes in ground level.

The linkage is designed for compact packaging, where the stowed package is <10% of the deployed volume.

The linkage will, when released from its stowed position, by release of a cover or other means, fall under gravity to open itself and remain in an operational position. When fully open a latch will be actuated and lock the top link to the chassis.

During opening a latch striker (4) is pushed rearward by a latch hook plate, which is integrated into the top link (3).

When deployed, the latch striker is clear to return to the closed position.

When the mechanism is loaded into the ground, the latch hook engages on the striker and locks the top link in position.

The front plate has a specific stiffness, to improve the tendency to collect and remove mines. If the front plate is too stiff the impact forces are increased, requiring a stronger and heavier structure. If the front plate is too flexible it will tend to sweep over the mines without clearing them.

The bottom link acts as a break-back, to prevent overload and damage to the blade, for example, when a rigid obstacle is encountered. By acting through a buckling mechanism, the bottom link is rigid up until an overload force is reached, whereupon it will deflect.

The top link acts as a leaf-spring, to apply a push-down force on to the ground. This keeps the bottom edge of the front plate in contact with the ground.

The cross-sectional area, defined as depth multiplied by height (D×H as illustrated inFIG.9) of the working member in the stowed position, is 25% or less than the cross-sectional area in the deployed position. In this embodiment, for example, stowed position is approximately I8% of the area of the deployed position.

Although illustrative embodiments of the invention have been disclosed in detail herein, with reference to the accompanying drawings, it is understood that the invention is not limited to the precise embodiments shown and that various changes and modifications can be effected therein by one skilled in the art without departing from the scope of the invention as defined by the appended claims and their equivalents.