Scale For A Grain Screen, Adjustable Grain Screen And Method For Adjusting Scales For A Grain Screen

Abstract

Adjustable screen comprising scales (1) consisting of teeth (1.1) interspersed with bases (1.2), an inclined tab (1.3) on the rear portion and a channel (1.4) between the inclined tab (1.3) and teeth (1.1) for the introduction of the shafts (3.1) for moving the scales, the teeth (1.1) being fluted and the bases (1.2) being flat. It also comprises partitions (2.1) fastened at the ends (2.2) between the sides (2.3) of the structure of the screen (2) and a mechanism for adjusting the scales (3) made up of shafts (3.1) rotating in orifices (2.6) of the sides (2.3) of the structure of the screen (2). After the orifices (2.6), the shafts (3.1) have an S-shaped bend (3.2) for introduction into the orifices (3.4) of the ruler (3.3) in the outer face of the side of the screen (2.3). The end (2.2) has an orifice (2.7) on which a spindle (3.5) with a rotating lever (3.6) is mounted. An elastic part (3.8) flanked by protective elements (3.7) is mounted on the spindle (3.5).

Claims

1-5. (canceled)

6. A adjustable grain screen comprising: a grain screen presenting angular movement for setting the passage aperture of the grains endowed with teeth, an inclined tab and a channel between said inclined tab and said teeth for introduction of shafts for moving the scales, said teeth being interspersed with flat bases, characterized by said teeth being fluted.

7. An adjustable grain screen comprising: partitions fixed at the ends between the sides of the screen structure and a mechanism for adjusting the scales in said screen structure further comprising shafts rotating in orifices positioned at said sides of said screen structure, said scales being fixed on said shafts by way of channels, and after the orifices of said side of the screen said shafts have an S-shaped bend for introduction into said orifices of a ruler positioned on the outer face of the side of said screen, in whose orifices the bent ends of said shafts of said scales are mounted, said adjustable grain screen further comprising at one of the ends of the structure an orifice where a spindle with an eyelet is mounted for commanding its rotary movement, an elastic part flanked by protective elements being mounted on said spindle by the opposite side of the end of the structure of the screen, followed by a nut and said spindle having a second nut on which said ruler is fastened.

8. The adjustable grain screen according to claim 7, further comprising reinforcement elements installed on the lower part of said screen structure.

9. The adjustable grain screen according to claim 7, wherein said screen structure has supports for assembly on conventional harvesters.

Description

DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0017] For the present invention to be fully understood and put into practice by any person skilled in this field of technology, it is now clearly and fully described based on the accompanying drawings listed below:

[0018] FIG. 1—perspective view of the screen;

[0019] FIG. 2—perspective view of detail A of FIG. 1;

[0020] FIG. 3—perspective view of the scale in isolation;

[0021] FIG. 4—side view of the scale in isolation;

[0022] FIG. 5—perspective view of the structure of the screen;

[0023] FIG. 6—perspective view of detail B of FIG. 1;

[0024] FIG. 7—blown-up perspective view of the adjustment mechanism of the scales;

[0025] FIG. 8—perspective view of detail C of FIG. 7;

[0026] FIG. 9—perspective view of the scales adjustment mechanism;

[0027] FIG. 10—blown-up perspective view of the scales adjustment mechanism.

[0028] FIG. 11—perspective view of a constructive option of the structure of the screen.

DETAILED DESCRIPTION OF THE INVENTION

[0029] FIGS. 1 and 2 illustrate the screen for harvesters of the invention comprising scales (1) that adapts to any grain type and size commonly reaped by the harvesters. The scales (1) are installed on the structure of the screen (2), comprising at least one adjustment mechanism (3).

Scales for a Grain Screen

[0030] To be able to cover the largest possible number of grain types, the scales (1), illustrated in FIGS. 3 and 4, consist of teeth (1.1), separated by bases (1.2). In order to facilitate adaptation to the different grain types, the teeth (1.1) are fluted, favoring the flow of the grains and hampering the passage of impurities, whereas the bases (1.2) are flat and intersperse the teeth (1.1). Additionally, the teeth (1.1) have greater resistance to deformity, meaning the screen has a longer useful life and lower maintenance cost. The scales (1) further present an inclined tab (1.3) on the rear portion which is overlapped by the front portion consisting of teeth (1.1) and base (1.2) that are designed for the passage of air from the ventilators contained in the harvester, guaranteeing the best circulation on the screen. The purpose of the ventilators is to help clean the grains, and the inclined tab (1.3) directs the airflow, improving the yield of the ventilators, being responsible for the improved results in grain cleaning. The scale (1) presents a channel (1.4) between an inclined tab (1.3) and the teeth (1.1) for the introduction of the shaft (3.1) to fasten and move each one of the scales (1).

[0031] For example, the sizes of the teeth (1.1) are 13 to 20 mm wide and 19 to 26 mm long. More preferably, the teeth (1.1) are 16.94 mm wide and 22.64 mm long. The bases (1.2) are 25 to 40 mm wide, preferably 33.1 mm. The inclined tab (1.3) has an inclination of 146 to 174°, preferably 160°.

Adjustable Grain Screen

[0032] FIG. 5 illustrates the structure of the screen (2) that comprises partitions (2.1) fastened at the ends (2.2) between the sides (2.3) of the structure (2), having reinforcement elements (2.4) installed on the lower part to enhance the firmness of the structure (2). The structure of the screen (2) also has supports (2.3) for mounting on conventional harvesters. The purpose of the partitions (2.1) is to divide the mass of grains to be screened by the scales (1), better distributing the grains over the screen and preventing the build-up thereof. Additionally, the partitions (2.1) conduct the air, preventing displacement of the grains towards the sides of the screen, when on sloping terrain. The lower (2.1′) of the partitions (2.1) channel the airflow coming from the ventilators for improved performance.

[0033] FIGS. 6 to 8 detail the adjustment mechanism of the scales (3) in the structure of the screen (2) comprising shafts (3.1) that rotate in orifices (2.6) positioned on the sides (2.3.) of the structure of the screen (2). The scales (1) are fastened on the shafts (3.1) by way of the channels (1.4), enabling the rotation command for setting the aperture of passage of the grains through the screen. After the orifices (2.6) of the side of the screen (2.3) the shafts (3.1) are S-shaped (3.2) for introduction into the orifices (3.4) of the ruler (3.3) positioned on the outer face of the side of the screen (2.3).

[0034] In one constructive option, the lateral (2.3) of the structure of the screen (2) may have orifices (2.6) measuring 2 to 6 mm in diameter, preferably 4 mm, being disposed every 18 to 22 mm, preferably every 20 mm. Additionally, the orifices (2.6) of the side (2.3) of the structure of the screen (2) may have the same constructive configuration of the orifices (3.4) of the ruler (3.3), to penetrate the free end of the shaft (3.1) without interference. Therefore, in this constructive option the orifices (3.4) are 2 to 6 mm in diameter, preferably 4 mm. Should more than one orifice (3.4) be used, they may be arranged every 18 to 22 mm, preferably every 20 mm.

[0035] FIG. 7 details the assembly of the adjustment mechanism (3) of the scales mounted on the structure of the screen (2), and one of its ends (2.2) has an orifice (2.7) where a spindle (3.5) endowed with a rotating lever (3.6) is mounted for commanding the rotary movement that enables the setting of the aperture of the scales (1) for different grain types and sizes.

[0036] As complemented in FIGS. 9 and 10, to prevent wear and tear between the rotating lever (3.6) of the spindle (3.5) and the end (2.2) of the structure of the screen (2) a protective element (3.7) is installed. An elastic part (3.8), flanked by protective elements (3.7), is mounted on the spindle (3.5) by the opposite side of the end (2.2) of the structure of the screen (2), followed by a nut (3.9).

[0037] The rotating lever (3.6) also commands the locking of the rotary movement of the spindle (3.5) of the adjustment mechanism (3). Accordingly, the rotating lever (3.6) can be positioned horizontally or vertically, as represented in FIGS. 9 and 10, respectively. When in the horizontal position, the rotating lever (3.6) exerts pressure and expands the elastic part (3.8) locked by the nut (3.9), whereby the attrition is increased between adjustment mechanism (3) and structure of the screen (2), locking the rotary movement of the spindle (2). When the rotating lever (3.6) is in the vertical position, the pressure relief makes the elastic part (3.8) return to its original status, releasing the spindle (3.5) for rotating and setting the position of the scales (1).

[0038] Another nut (3.10) is threaded on the spindle (3.5) on which the ruler (3.3) is fastened, in whose orifices (3.4) the bent ends (3.2) of the shafts (3.1) of the scales (1) are mounted. For the adjustment mechanism (3) to be able to act on the scales (1), the ruler (3.3) is moved axially by the advance or retreat of the nut (3.10) obtained by the rotation of the spindle (3.5). Accordingly, through the rotation of the spindle (3.5), which is threaded, the nut (3.10) moves forward or backward, dragging the ruler (3.3) which produces the angular movement of the shafts (3.1) taking the scales (1) with them.

Method for Adjusting Scales for a Grain Screen

[0039] The method for adjusting the angular position of the scales (1) of the screen for harvesters comprises the following operations: [0040] Execution of rotary movement of a spindle (3.5) supported in the structure of the screen (2); [0041] Axial displacement of a nut (10) by rotary action of the spindle (3.5); [0042] Drag of a ruler (3.3) endowed with orifices (3.4) that is connected to a nut (10), the orifices (3.4) being penetrated by the bent ends (3.2) of the shafts (3.1) of the scales; [0043] Inclination control of the scales (1) that is responsible for the aperture of the screen by way of the angular movement of the shafts (3.1) generated by the axial movement of the ruler (3.3).

[0044] It is important to emphasize that the drawings and description are not intended to limit the embodiments of the inventive concept now proposed, but rather to illustrate and make the conceptual innovations disclosed in this solution comprehensible. Therefore, the descriptions and images should be interpreted in an illustrative—not limitative—manner, and there may be other equivalent or analog ways of implementing the inventive concept now disclosed and that do not stray from the scope of protection delineated in the solution proposed.

[0045] This specification depicts a scale for a grain screen, a grain screen with adjustment mechanism and method for adjusting scales for grain harvester screen, which are endowed with novelty, inventive activity, industrial application and are fully disclosed, whereby complying with the requirements for the grant of the privilege sought.