Structural arrangement applied to a school desk with simultaneous and proportional adjustment of the height of the desktop and the footrest

Abstract

The present utility patent relates to a school desk that, through a single simultaneous adjustment movement, allows for the vertical displacement of both a top panel (9) and a footrest platform (8), enabling the desk to adapt to users of different heights without modifying the chair structure. The constructive arrangement comprises two base sections (1), two top rack bars (2), two footrest rack bars (3), two spring-biased levers (4), a locking pin (5), two nuts (6), two double gears (7), a footrest platform (8), and a top panel (9). The double gears (7) have different numbers of teeth on each side, thereby ensuring proportional movement between the top panel (9) and the footrest platform (8). The locking mechanism requires simultaneous actuation of the spring-biased levers (4), preventing unintentional release. This configuration provides a simple, efficient, and ergonomic adjustment system suitable for educational environments.

Description

TECHNICAL FIELD

[0001] The present invention relates to a school desk configured to allow, through a single quick and simultaneous adjustment movement, the vertical displacement of both a top panel and a footrest platform. The adjustment enables the desk to accommodate users of different heights without the need to modify the chair structure.PRIOR ART

[0002] Prior art brazilian utility models MU6802602 and MU7102825 disclose desks whose height adjustment is achieved through pairs of profiled elements fitted telescopically into each other, including through-holes that receive screws or locking pins. The brazilian utility model MU8201191-5 discloses table columns formed by two concentric tubes, the height of which is adjustable by rotating wing nuts that drive screws through the metal tubes.

[0003] Currently available sets of school tables and chairs allow for the height adjustment of the top panel and seat individually, which requires multiple and time-consuming operations to achieve proper ergonomic fit for the user. This complexity makes adjustments between school shifts impractical, both due to the time required and the risk of incorrect assembly or misuse.

[0004] This configuration maintains the proportional distances between the seat and the top panel, and between the seat and the footrest platform. The mechanism can be actuated only by simultaneously pressing two levers positioned on opposite sides, thereby preventing inadvertent or accidental release of the locking system.

[0005] In order to overcome these drawbacks, the present invention provides a school desk in which the top panel and the footrest platform are interconnected through a single gear mechanism comprising double gears with different numbers of teeth on each side. This configuration maintains the proportional distances between the seat and the top panel, and between the seat and the footrest platform.BRIEF DESCRIPTION

[0006] The mechanism can be actuated only by simultaneously pressing two levers positioned on opposite sides, thereby preventing inadvertent or accidental release of the locking system. The constructive arrangement comprises a base, top rack bars, footrest rack bars, spring-biased levers, a locking pin, nuts, double gears, a footrest platform, and a top panel.BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The invention is further described with reference to the accompanying drawings, in which:

[0008] FIG. 1 illustrates an assembled perspective view of the desk, with and without the top panel, showing all structural elements including the two base sections, the two top rack bars, the two footrest rack bars, the two spring-biased levers, the locking pin, the footrest platform, and the top panel.

[0009] FIG. 2 illustrates an exploded view of the desk, showing the two base sections, the two top rack bars, the two footrest rack bars, the two spring-biased levers, the locking pin, the two nuts, the two double gears, the footrest platform, and the top panel.

[0010] FIG. 3 illustrates a side elevation view of the desk in three distinct adjustment positions, simulating users of different heights.DETAILED DESCRIPTION

[0011] The constructive arrangement comprises a base (1), top rack bars (2), footrest rack bars (3), spring-biased levers (4), a locking pin (5), nuts (6), double gears (7), a footrest platform (8), and a top panel (9).

[0012] As shown in the figures, the base (1) is coupled to the top rack bars (2), which are connected to the footrest rack bars (3) through the double gears (7), secured by the locking pin (5) and the nuts (6), and locked in the desired position by the spring-biased levers (4).

[0013] When the top rack bars (2) are released by the spring-biased levers (4), they can be pushed downward, causing the double gears (7) to rotate. Since the double gears (7) are also connected to the footrest rack bars (3), the footrest rack bars (3) move upward. To reverse the motion, the footrest platform (8), which is connected to the footrest rack bars (3), is pressed downward, thereby driving the top rack bars (2) upward.

[0014] The difference in the number of teeth on the two sections of the double gears (7) results in different travel distances for the top rack bars (2) and the footrest rack bars (3), maintaining a proportional relationship between the distance from the seat to the footrest platform (8) and from the seat to the top panel (9).

[0015] The configuration described herein provides a practical, efficient, economical, and innovative solution, meeting the criteria for protection as a utility patent by virtue of its technological novelty and industrial applicability.

Examples

Embodiment Construction

[0011]The constructive arrangement comprises a base (1), top rack bars (2), footrest rack bars (3), spring-biased levers (4), a locking pin (5), nuts (6), double gears (7), a footrest platform (8), and a top panel (9).

[0012]As shown in the figures, the base (1) is coupled to the top rack bars (2), which are connected to the footrest rack bars (3) through the double gears (7), secured by the locking pin (5) and the nuts (6), and locked in the desired position by the spring-biased levers (4).

[0013]When the top rack bars (2) are released by the spring-biased levers (4), they can be pushed downward, causing the double gears (7) to rotate. Since the double gears (7) are also connected to the footrest rack bars (3), the footrest rack bars (3) move upward. To reverse the motion, the footrest platform (8), which is connected to the footrest rack bars (3), is pressed downward, thereby driving the top rack bars (2) upward.

[0014]The difference in the number of teeth on the two sections of the ...

TECHNICAL FIELD

[0001] The present invention relates to a school desk configured to allow, through a single quick and simultaneous adjustment movement, the vertical displacement of both a top panel and a footrest platform. The adjustment enables the desk to accommodate users of different heights without the need to modify the chair structure.PRIOR ART

[0002] Prior art brazilian utility models MU6802602 and MU7102825 disclose desks whose height adjustment is achieved through pairs of profiled elements fitted telescopically into each other, including through-holes that receive screws or locking pins. The brazilian utility model MU8201191-5 discloses table columns formed by two concentric tubes, the height of which is adjustable by rotating wing nuts that drive screws through the metal tubes.

[0003] Currently available sets of school tables and chairs allow for the height adjustment of the top panel and seat individually, which requires multiple and time-consuming operations to achieve proper ergonomic fit for the user. This complexity makes adjustments between school shifts impractical, both due to the time required and the risk of incorrect assembly or misuse.

[0004] This configuration maintains the proportional distances between the seat and the top panel, and between the seat and the footrest platform. The mechanism can be actuated only by simultaneously pressing two levers positioned on opposite sides, thereby preventing inadvertent or accidental release of the locking system.

[0005] In order to overcome these drawbacks, the present invention provides a school desk in which the top panel and the footrest platform are interconnected through a single gear mechanism comprising double gears with different numbers of teeth on each side. This configuration maintains the proportional distances between the seat and the top panel, and between the seat and the footrest platform.BRIEF DESCRIPTION

[0006] The mechanism can be actuated only by simultaneously pressing two levers positioned on opposite sides, thereby preventing inadvertent or accidental release of the locking system. The constructive arrangement comprises a base, top rack bars, footrest rack bars, spring-biased levers, a locking pin, nuts, double gears, a footrest platform, and a top panel.BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The invention is further described with reference to the accompanying drawings, in which:

[0008] FIG. 1 illustrates an assembled perspective view of the desk, with and without the top panel, showing all structural elements including the two base sections, the two top rack bars, the two footrest rack bars, the two spring-biased levers, the locking pin, the footrest platform, and the top panel.

[0009] FIG. 2 illustrates an exploded view of the desk, showing the two base sections, the two top rack bars, the two footrest rack bars, the two spring-biased levers, the locking pin, the two nuts, the two double gears, the footrest platform, and the top panel.

[0010] FIG. 3 illustrates a side elevation view of the desk in three distinct adjustment positions, simulating users of different heights.DETAILED DESCRIPTION

[0011] The constructive arrangement comprises a base (1), top rack bars (2), footrest rack bars (3), spring-biased levers (4), a locking pin (5), nuts (6), double gears (7), a footrest platform (8), and a top panel (9).

[0012] As shown in the figures, the base (1) is coupled to the top rack bars (2), which are connected to the footrest rack bars (3) through the double gears (7), secured by the locking pin (5) and the nuts (6), and locked in the desired position by the spring-biased levers (4).

[0013] When the top rack bars (2) are released by the spring-biased levers (4), they can be pushed downward, causing the double gears (7) to rotate. Since the double gears (7) are also connected to the footrest rack bars (3), the footrest rack bars (3) move upward. To reverse the motion, the footrest platform (8), which is connected to the footrest rack bars (3), is pressed downward, thereby driving the top rack bars (2) upward.

[0014] The difference in the number of teeth on the two sections of the double gears (7) results in different travel distances for the top rack bars (2) and the footrest rack bars (3), maintaining a proportional relationship between the distance from the seat to the footrest platform (8) and from the seat to the top panel (9).

[0015] The configuration described herein provides a practical, efficient, economical, and innovative solution, meeting the criteria for protection as a utility patent by virtue of its technological novelty and industrial applicability.

Examples

Embodiment Construction

[0011]The constructive arrangement comprises a base (1), top rack bars (2), footrest rack bars (3), spring-biased levers (4), a locking pin (5), nuts (6), double gears (7), a footrest platform (8), and a top panel (9).

[0012]As shown in the figures, the base (1) is coupled to the top rack bars (2), which are connected to the footrest rack bars (3) through the double gears (7), secured by the locking pin (5) and the nuts (6), and locked in the desired position by the spring-biased levers (4).

[0013]When the top rack bars (2) are released by the spring-biased levers (4), they can be pushed downward, causing the double gears (7) to rotate. Since the double gears (7) are also connected to the footrest rack bars (3), the footrest rack bars (3) move upward. To reverse the motion, the footrest platform (8), which is connected to the footrest rack bars (3), is pressed downward, thereby driving the top rack bars (2) upward.

[0014]The difference in the number of teeth on the two sections of the ...

Claims

1. A constructive arrangement applied to a school desk with simultaneous and proportional adjustment of the height of the top panel and the footrest platform, comprising two base sections; two top rack bars; two footrest rack bars; two spring-biased levers a locking pin; two nuts; two double gears a footrest platform and a top panel.

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