CN2127353Y

CN2127353Y - Myopia-proof writing frame

Info

Publication number: CN2127353Y
Application number: CN 92205615
Authority: CN
Inventors: 罗学家
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-04-04
Filing date: 1992-04-04
Publication date: 1993-02-24
Anticipated expiration: 2002-04-04

Abstract

The utility model relates to a myopia-proof writing frame, which is a learning tool designed for primary and secondary school students. The myopia-proof writing frame is used for correcting the read-write postures of the children, keeping the reasonable writing distance, protecting the eyesight and preventing the spinal curvature. The myopia-proof writing frame is composed of a clamp plate clamped on the desktop and a door-shaped limit frame. The myopia-proof writing frame is characterized in that a clamping structure comprises a screw rod, a screw nut, a handgrip, a movable clamp piece connected to the end of the screw rod and a fixed clamp piece fixed on the clamp plate. The handgrip is turned by hands, via the relative rotation of the screw rod and the screw nut, the screw rod drives the movable clamp piece to move up to clamp the edge of the desktop by matching with the fixed clamp piece. The myopia-proof writing frame has firm installation, convenient disassembly and assembly, and portability.

Description

Myopia-proof writing frame

The utility model is a kind of learning tool.

For proper children's read-write posture, pre-myopia prevention, patent document GN CC88 2 05326.4 discloses the portable myopia prevention writing rack that is installed on the desktop edge.This writing rack has clamping plate 2, is drilled with the hole at the clamping plate two ends, with bolt and nut 3 two rubber blankets 4 is fixed on the clamping plate outsides respectively, two vertical rods of the position-limited rack 1 of door type is injected respectively in the emptying aperture of rubber blanket again.Clamping plate are made the L type, load onto pressure frame in the inboard of its vertical part, and a torsion spring is respectively adorned at the two ends of pressure frame, and at the middle part of pressure frame a flush ring are installed.During use, with pulling moving draw ring, pressure frame opens, and clamping plate are placed on the desktop edge, lets go and unclamps flush ring, and pressure frame utilizes the torsion of torsion spring to clamp the desktop edge and can use.But because the torsion of torsion spring can not be excessive, otherwise the child can not draw away, and design torsion is 3 kilograms to the maximum, facts have proved that this instrument presss from both sides on the table and not tight, uses the situation that instrument comes off from desktop takes place often, thereby influenced the effective utilization of instrument.

The purpose of this utility model provides and a kind ofly is easy to dismounting and carries, install firm myopia prevention writing rack.

The purpose of this utility model realizes by following proposal:

Scheme one: offer a hole 5 at the middle part of clamping plate 2; The screw rod 6 that is slightly less than the hole internal diameter with an external diameter is through in the hole; The part that screw rod is exposed at above the clamping plate puts a nut that matches with it 7, in order to use the hand rotating nut more easily, nut is embedded in one is looped around in the outer handle 8 of screw rod; The affixed moving intermediate plate 9 in screw rod lower end, moving intermediate plate and screw rod near normal; The length of screw rod is between the 30-50 millimeter.Use the hand turning handle, screw rod and moving intermediate plate can rise or descend.The desktop edge is placed under the clamping plate, moves on the intermediate plate, and turning handle rises intermediate plate, can be with the utility model clamping on the table.

Scheme two: clamping plate 2 below by be fixed on the clamping plate edge support 10 affixed one decide intermediate plate 11; Clamping plate, support and decide intermediate plate and form the n type.Decide intermediate plate and clamping plate spacing 30-50 millimeter, to adapt to the desktop of different-thickness.Offer a hole 12 at clamping plate middle parts, with the hole be stacked in mutually on the clamping plate an affixed nut 13 or directly on the hole tapping to form nut.The screw rod 14 that with nut be complementary of one length between the 30-55 millimeter revolved nut and hole; The screw rod upper end is embedded in the handle 15; The screw rod lower end connects one and the approximately perpendicular moving intermediate plate 16 of screw rod.Turning handle can make screw rod and moving intermediate plate rise or decline.The desktop edge is inserted in moving intermediate plate and decides between the intermediate plate, and turning handle makes the intermediate plate decline can be with the utility model clamping on the table.Moving intermediate plate also rotates simultaneously and damages desktop when avoiding rotating screw bolt, and screw rod links to each other in known bearing mode with moving intermediate plate.The circumferential lower convexity in limit below the moving simultaneously intermediate plate is so that screw rod and desktop disengage.

But the utility model utilizes spiral labour-saving principle to promote moving intermediate plate and clamps desktop, has increased clamping power, and the child also be fixedly mounted in it on the desktop so long.

Description of drawings: Fig. 1 is the structure chart of scheme one; Fig. 2 is the structure chart of scheme two.

Of the present utility modelly decide intermediate plate, support, moving intermediate plate, screw rod, nut and handle available metal or plastic production.

Claims

1, myopia prevention writing rack has clamping plate 2, is drilled with the hole at the clamping plate two ends, with bolt and nut 3 two rubber blankets 4 is fixed on the outside of clamping plate respectively, two vertical rods of the position-limited rack 1 of door type is compressed into the emptying aperture of rubber blanket respectively again; It is characterized in that offering a hole 5 at the middle part of clamping plate 2; The screw rod 6 that is slightly less than the hole internal diameter with an external diameter is through in the hole; The part that screw rod is exposed at above the clamping plate puts a nut that matches with it 7, and nut is embedded in one and is looped around in the outer handle 8 of screw rod; The affixed moving intermediate plate 9 in screw rod lower end, moving intermediate plate and screw rod near normal; Spiro rod length is between the 30-50 millimeter.

2, myopia prevention writing rack has clamping plate 2, is drilled with the hole at the clamping plate two ends, with bolt and nut 3 two rubber blankets 4 is fixed on the outside of clamping plate respectively, two vertical rods of the position-limited rack 1 of door type is compressed into the emptying aperture of rubber blanket respectively again; It is characterized in that clamping plate 2 below by be fixed on the clamping plate edge support 10 affixed one decide intermediate plate 11; Clamping plate, support and decide intermediate plate and form the n type; Decide intermediate plate and clamping plate spacing 30-50 millimeter; Offer a hole 12 at clamping plate middle parts, with the hole be stacked in mutually on the clamping plate an affixed nut 13 or directly on the hole tapping form nut 13; Screw rod 14 with nut matches revolved nut and hole; Spiro rod length is between the 30-50 millimeter, and the upper end is embedded in the handle 15, and the lower end connects one and the approximately perpendicular moving intermediate plate 16 of screw rod; Screw rod links to each other in known bearing mode with moving intermediate plate; The circumferential lower convexity in limit below the moving intermediate plate.

3, myopia prevention writing rack according to claim 1 and 2 is characterized in that said decide intermediate plate, support, moving intermediate plate, screw rod, nut and handle available metal or plastic production.