CN210095192U

CN210095192U - Head-lowering prevention device

Info

Publication number: CN210095192U
Application number: CN201822007924.0U
Authority: CN
Inventors: 赵本博
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-23
Filing date: 2018-11-23
Publication date: 2020-02-21
Anticipated expiration: 2028-11-23

Abstract

A head-lowering prevention device for preventing head-lowering or correcting a head-lowering habit in learning. The telescopic rod comprises a shell, a main telescopic rod 5 and a chin rest 7, a height control device for the main telescopic rod 5 and a clamping device, wherein an upward-opening main guide groove 8 and a downward-opening lower guide groove 9 positioned behind the main guide groove are formed in the wall of the shell, the main telescopic rod 5 and the lower telescopic rod 6 are respectively accommodated in the upward-opening main guide groove and the downward-opening lower guide groove to slide up and down, and a partition plate is arranged between the main guide groove and the lower guide groove or no partition plate. The height control device is positioned at the upper part of the shell, and the main telescopic rod 5 is allowed to freely slide up and down or slide in a single direction through the clutch of the ratchet to the main telescopic rod rack 15. The clamping device is composed of a lower telescopic rod 6, a lower clamping plate 4 and an upper clamping plate 3 which is connected to the lower end of the shell, wherein the lower telescopic rod is vertically opposite to the upper clamping plate 3 and is forwards directed, and the lower rear part of the shell is provided with a structure which allows the lower telescopic rod 6 to slide up and down or further lifts and presses the lower telescopic rod upwards.

Description

Head-lowering prevention device

Technical Field

The utility model relates to a be fixed in desk border, be used for preventing or correct the device that the student too stooped when studying.

Background

The similar products in the prior art are mostly fixed by adopting a transverse U-shaped clamp, and have the problems of large volume and difficult operation; the lifting of the main telescopic rod of some products is also particularly difficult for children, so that the children abandon the use.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a little, the swift, the easy operation prevent the device of bowing of occupation space.

In order to achieve the purpose, the utility model comprises a shell, a main telescopic rod with a chin rest, a height control device and a clamping device, wherein the shell is formed by welding a front shell piece and a rear shell piece or fixing screws together, an upward opening main guide groove and a downward opening lower guide groove are formed by the inner walls of the front shell piece and the rear shell piece, the main telescopic rod and the lower telescopic rod are respectively accommodated to slide up and down in the shell, the lower guide groove is positioned at the lower part of the rear side of the main guide groove, a partition plate or no partition plate is arranged between the main guide groove and the rear shell piece, and the inner walls at two sides of the front shell piece or the inner shell of the shell piece support the two sides of the lower telescopic rod which is wider than the main telescopic rod backwards when no partition plate; a vertical surface of the main telescopic rod is provided with a sawtooth-shaped main telescopic rod rack with a triangular or inclined upper part and flat lower part; the height control device is a bar block positioned in the upper part of the shell, a ratchet bar or a ratchet is arranged on the vertical surface of the height control device, the height control device is meshed with the main telescopic rod rack on the main telescopic rod under the action of gravity or spring elasticity, and the ratchet bar or the ratchet can be separated from the main telescopic rod rack manually; the clamping device has the following structure: the lower telescopic rod can slide up and down in the lower guide groove, the lower end of the lower telescopic rod is connected with a lower clamping plate, the lower clamping plate and an upper clamping plate connected to the lower end of the shell in a forward mode are opposite up and down, a pressing structure arranged in the lower portion of the rear piece of the shell is used for separating or meshing a lower telescopic rod rack on the vertical surface of the lower telescopic rod through a pawl or a gear, the lower telescopic rod is allowed to slide up and down together with the lower clamping plate, and the lower telescopic rod and the lower clamping plate are further lifted and pressed when the lower clamping plate contacts with the lower surface of the table edge.

The height control device is: the lower end of the small plate is connected with one side of a semi-cylinder body positioned in the shell, which is positioned on the upper surface of a fixed shaft buckled on the lower edge of a transverse long hole on the upper part of the shell, the semi-cylinder body is matched with the fixed shaft as a bearing bush, and one side of the semi-cylinder body positioned outside the shell extends downwards to become thinner gradually and is warped outwards to form a button; the ratchet bar is meshed with the main telescopic rod rack on the main telescopic rod under the elastic force of the spring between the small plate and the shell, the button is pressed down, the ratchet bar is separated from the main telescopic rod rack, and the main telescopic rod can be retracted into the main guide groove.

The height control means may also be: the splitting surface is a splitting sliding block with a ratchet bar on a vertical surface, the other splitting surface is attached to the inner wall of an inclined plane positioned at the upper part of the rear piece of the shell, the splitting surface is connected with a shifting block outside the rear piece of the shell through a vertical bar hole on the rear piece of the shell, the ratchet bar is meshed with the upper rack of the main telescopic rod under the pushing force of the gravity or the shifting block of the splitting sliding block, and the main telescopic rod slides in a single direction; the poking block is poked upwards, the ratchet bar is separated from the rack of the main telescopic rod, and the main telescopic rod can be retracted into the shell.

The pressing structure is characterized in that a sliding block capable of being lifted by a bolt is arranged at the lower part in a shell rear piece at the rear side of a lower telescopic rod, a non-return pawl meshed with a lower telescopic rod rack on the lower telescopic rod is hinged on the sliding block, a support leg is downwards arranged between a hinge shaft of a non-return pawl block and pawl teeth or a boss is arranged at the bottom of the shell, when the sliding block falls down, the support leg below the non-return pawl block contacts the bottom of the shell in advance, the non-return pawl is lifted by an angle when the sliding block contacts the bottom, the pawl teeth are separated from the lower telescopic rod rack on the lower telescopic rod, and at the moment, the lower telescopic rod can slide up and down; when the sliding block is lifted from the bottom surface of the shell in a rotating mode, the non-return pawl falls back by an angle and is meshed with the upper telescopic rod rack and the lower telescopic rod rack of the lower telescopic rod, when the sliding block is lifted continuously, the lower portion of the non-return pawl block is blocked and does not fall back by the angle, and the ratchet is lifted synchronously and presses the lower telescopic rod upwards.

The pressing structure can also be that the rear sides of the upper and lower telescopic rods in the rear piece of the shell are provided with gear teeth which are meshed with a rack of the backward lower telescopic rod on the lower telescopic rod, a pinion can be meshed with or separated from the gear teeth, a large gear rotating shaft and a small gear rotating shaft of the rotating shafts are respectively arranged on a supporting seat connected with the shell or a shaft hole of the rear piece of the shell, a knob positioned outside the shaft hole on the rear piece of the shell is connected with a small gear rotating shaft of the pinion, the knob is pulled outwards or pushed back, and the pinion is separated from or meshed with the large gear.

The end parts of the gear teeth of the small gear and the large gear which are opposite to each other in the separation state are in a split shape.

The pinion rotating shaft is provided with a wheel disc, the surface of the wheel disc is contacted with the inner wall of the shell when the two gears are meshed, and the contact surface is provided with a non-return ratchet or is coated with damping oil.

After the structure is adopted, when a user fixes a product, the lower clamping plate connected with the lower telescopic rod can quickly reach the lower part of the edge of the clamped table, and the pressing structure presses and fixes the clamped table, so that the product is quick and labor-saving; when the product is used, the main telescopic rod and the chin rest can be directly lifted to the required height, and the telescopic rod is simpler to retract when not used; when the product is stored, the lower telescopic rod can be retracted into the shell, so that the space is greatly saved.

Drawings

The invention is described in further detail below with reference to the accompanying drawings.

Fig. 1 is a cross-sectional view of a first embodiment of the present invention.

Fig. 2 is a cross-sectional view of the lower part of a second embodiment of the present invention.

Fig. 3 is a schematic view of the height control device for the main telescopic rod of the present invention. The pushing shifting block 30 slides up and down, and can push away or press the ratchet bar 13 connected to the split sliding block 31 positioned in the shell rear piece 2 from or on the rack on the main telescopic rod so as to control the lifting of the main telescopic rod; the wedge-shaped sliding block 31 can automatically block and fall by means of self gravity.

In the figure, 1 is a front piece of the shell, 2 is a back piece of the shell, 3 is an upper clamping plate, 4 is a lower clamping plate, 5 is a main telescopic rod, 6 is a lower telescopic rod, 7 is a chin rest, 8 is a main guide groove, 9 is a lower guide groove, 10 is a fixed shaft, 11 is a button, 12 is a small plate, 13 is a ratchet rack, 14 is a spring, 15 is a main telescopic rod rack, 16 is a lower telescopic rod rack, 17 is a sliding block, 18 is a non-return pawl, 19 is a block bulge, 20 is a large gear, 21 is a large gear rotating shaft, 22 is a screw, 23 is a lifting knob, 24 is a partition plate, 25 is a small gear, 26 is a small gear rotating shaft, 27 is a supporting seat.

Detailed Description

As shown in fig. 1, the upper end of the main telescopic rod 5 is connected with a chin rest 7, a rear elevation of the main telescopic rod is provided with a main telescopic rod rack 15, the main telescopic rod rack can slide up and down in an upward opening main guide groove 8 formed by welding a front shell piece 1 and a rear shell piece 2 and formed by a shell, a downward opening lower guide groove 9 is positioned at the rear side of the lower part of the main guide groove 8, and a partition plate 24 is arranged between the two; the rear vertical surface of the lower telescopic rod 6 is provided with a lower telescopic rod rack 16, and the lower end of the lower telescopic rod is connected with a lower clamping plate 4 which is opposite to an upper clamping plate 3 which is connected to the lower end of the shell and faces forward; the height control device of the main telescopic rod 5 is positioned at the upper part of the rear side of the shell rear piece 2, a semi-cylindrical structure in the middle of the height control device is buckled on the lower edge (a fixed shaft 10) of a transverse square hole positioned at the upper part of the shell rear piece 2, one side of the semi-cylindrical structure in the shell is upwards connected with a small plate 12, the small plate 12 extends downwards at the outer side of the shell and becomes thinner gradually and is turned upwards to form a button 11, and the shape is also beneficial to enabling a semi-cylinder body and the button to penetrate through the transverse square hole from inside to outside and be buckled on; the top end of the small plate 12 extends, thins, bends backwards, becomes a sheet spring 14 and presses on the inner wall of the shell rear plate 2, the upper half part of the spring is provided with a ratchet bar 13 forwards and is meshed with a main telescopic rod rack 15 on the rear vertical surface of the lower main telescopic rod 5, and at the moment, the main telescopic rod 5 can slide upwards; when the button 11 is pressed down, the ratchet bar 13 rotates backwards around the fixed shaft 10 and is separated from the main telescopic bar rack 15, and the main telescopic bar 5 can freely slide up and down and is accommodated in the shell. The partition plate 24 is fixed on the lower part of the shell by the front shell piece 1 and the back shell piece 2, the lower guide groove 9 is separated from the main guide groove 8, a check pawl 18 is hinged on a slide block 17 positioned on the inner lower part of the back shell piece 2 of the lower telescopic rod 6, and a ratchet on the check pawl 18 is meshed with a lower telescopic rod rack 16 on the back vertical surface of the lower telescopic rod 6; a lifting knob 23 positioned outside the shell is connected with a screw 22 to control the lifting of the sliding block 17, the middle part of the non-return pawl 18 is downwards provided with a supporting leg which is contacted with a boss 19 at the bottom of the shell, when the sliding block 17 falls to the bottom, the non-return pawl 18 is lifted by the supporting leg for an angle to separate a ratchet from the lower telescopic rod 16 of the teeth, the lower telescopic rod 6 can freely slide upwards or downwards, and the lower clamping plate 4 can be quickly contacted with a desktop; the lifting knob 23 is rotated, the screw 22 lifts the sliding block 17 in a rotating manner, the non-return pawl 18 rotates downwards for an angle, and the ratchet extends forwards to be meshed with the lower telescopic rod rack 16; the sliding block 17 is lifted continuously, the lower part of the non-return pawl 18 is blocked, the non-return pawl cannot rotate downwards continuously and can only lift along with the sliding block 17, the lower telescopic rod 6 is lifted and compressed, and the lower clamping plate 4 and the upper clamping plate 3 can combine force to clamp the table edge.

The upper part of the housing, the main telescopic rod 5 with the chin bar 7, the height control means, and the upper jaw 3 attached to the lower end of the housing of the second embodiment are identical to those of the first embodiment. The lower telescopic rod 6 of the second embodiment is wider than the main telescopic rod 5, two widened sides of the lower telescopic rod are supported backwards by the inner walls of the two sides of the front shell piece 1, the lower telescopic rod and the rear shell piece 2 form a lower guide groove 9 together, and the main telescopic rod 5 and the lower telescopic rod 6 sliding in the main guide groove 8 and the lower guide groove 9 are not interfered with each other, so that the injection molding of products is facilitated; the lower end of the lower telescopic rod 6 is connected with a lower clamping plate 4 which is opposite to the upper clamping plate 3 up and down, a big gear 20 and a small gear 25 are arranged in a shell at the rear side of the lower telescopic rod respectively through a big gear rotating shaft 21 and a small gear rotating shaft 26 of the lower telescopic rod and are arranged on a supporting seat 27 connected to the shell rear piece 2 or a shaft hole at the lower part of the shell rear piece 2, and the gear number ratio of the two is 3 to 1; the teeth of the large gear 20 are meshed with the lower telescopic rod rack 16 on the backward vertical surface of the lower telescopic rod 6; the knob 32 positioned on the outer side of the rear piece 2 of the shell is connected with the rotating shaft 26 of the small gear, the knob 32 is pulled outwards, the small gear 25 is separated from the big gear 20, the lower telescopic rod 6 is only connected with the big gear 20 at the moment, the resistance is small, the lower telescopic rod can freely slide up and down, the lower clamping plate 4 can be quickly contacted with the lower surface of the edge of a clamped table, then the knob 32 is pressed, the small gear 25 is meshed with the big gear 20, and the lower telescopic rod 6 can be further pressed upwards by rotating the knob 32. In order to make the two gears mesh smoothly, the end parts of the opposite gear teeth are in a split shape when the gears are separated, so that the two gears can mesh smoothly no matter what angle the two gears are at. In order to prevent the pressed lower clamping plate 4 from slowly loosening, a wheel disc 28 is arranged on the pinion rotating shaft 26, the wheel disc 28 is in contact with the inner wall of the shell when the two gears are meshed, the contact surface is a toothed structure 33 (for convenience of injection molding, the toothed structure on the inner wall of the side surface of the shell can only keep a part of the toothed structure which is close to the rear bottom position in the shell and is higher than the large surface of the inner wall and can be injected), the teeth are ratchets for preventing the reverse rotation of the gears, the wheel disc 28 is pressed against the inner wall of the shell when the knob 32 is screwed down by hand, and the ratchets can be meshed together to play a role of preventing the reverse.

Claims

1. The utility model provides a prevent low head device, includes that casing, main telescopic link are held in the palm even, height control device and clamping device constitute characterized by: the shell is formed by welding or screwing a shell front piece (1) and a shell rear piece (2) together, an upward-opening main guide groove (8) and a downward-opening lower guide groove (9) are formed by the inner walls of the shell front piece and the shell rear piece, a main telescopic rod (5) and a lower telescopic rod (6) are respectively accommodated in the main guide groove and the lower guide groove to slide up and down, the lower guide groove (9) is positioned at the lower part of the rear side of the main guide groove (8), a partition plate (24) or no partition plate is arranged between the main guide groove and the lower guide groove, and when no partition plate exists, the inner walls or the inner shells at two sides of the shell front piece (1) support the two sides of the lower telescopic rod (6) which are wider than the main telescopic rod (5) backwards, so that the main telescopic rod (5) and the lower; a sawtooth-shaped main telescopic rod rack (15) with a triangular or inclined upper part and a flat lower part in the cross section shape is arranged on one vertical surface of the main telescopic rod (5); the height control device is a bar block positioned in the upper part of the shell, a ratchet bar (13) or a ratchet is arranged on the vertical surface of the height control device, the height control device is meshed with a main telescopic rod rack (15) on the main telescopic rod (5) under the action of gravity or spring force, and the ratchet bar (13) or the ratchet can be separated from the main telescopic rod rack (15) manually; the clamping device has the following structure: the lower telescopic rod (6) can slide up and down in the lower guide groove (9), the lower end of the lower telescopic rod is connected with a lower clamping plate (4), the lower clamping plate (4) is vertically opposite to a forward upper clamping plate (3) connected to the lower end of the shell, a pressing structure arranged in the lower part of the rear piece (2) of the shell is used for separating or meshing a lower telescopic rod rack (16) on the vertical surface of the lower telescopic rod (6) through a pawl or a gear, allowing the lower telescopic rod (6) and the lower clamping plate (4) to slide up and down, and further lifting and pressing the lower telescopic rod (6) and the lower clamping plate (4) when the lower clamping plate (4) contacts the lower surface of the desk edge.

2. The anti-heads-down device of claim 1, wherein: the height control device is: a small plate (12) with an upright ratchet bar (13) on the upper part, wherein the lower end of the small plate is connected with one side of a semi-cylinder body on a fixed shaft (10) buckled on the lower edge of a transverse long hole on the upper part of the shell body, which is positioned in the shell body, the semi-cylinder body is matched with the fixed shaft (10) as a bearing bush, and one side of the semi-cylinder body positioned outside the shell body extends downwards to become thinner gradually and is tilted outwards to form a button (11); the ratchet bar (13) is meshed with a main telescopic rod rack (15) on the main telescopic rod (5) under the elastic force of a spring (14) between the small plate (12) and the shell, the button (11) is pressed down, the ratchet bar (13) is separated from the main telescopic rod rack (15), and the main telescopic rod (5) can be put into the main guide groove (8).

3. The anti-heads-down device of claim 1, wherein: the height control device is: a split-shaped sliding block (31) with a ratchet bar (13) is arranged on a vertical face of one split surface, the other split surface is attached to the inner wall of a bevel surface positioned at the upper part of a shell rear piece (2), the other split surface is connected with a shifting block (30) outside the shell rear piece (2) through a vertical bar hole on the shell rear piece (2), the ratchet bar (13) is meshed with a rack (15) on the main telescopic rod (5) under the pushing force of the gravity of the split-shaped sliding block (31) or the shifting block (30), and the main telescopic rod (5) slides upwards in a single direction; the poking block (30) is poked upwards, the ratchet bar (13) is separated from the main telescopic rod rack (15), and the main telescopic rod (5) can be retracted into the shell.

4. The anti-heads-down device of claim 1, wherein: the pressing structure is characterized in that a sliding block (17) capable of being lifted by a bolt (22) is arranged at the lower part in a shell rear piece (2) at the rear side of a lower telescopic rod (6), a non-return pawl (18) meshed with a lower telescopic rod rack (16) on the lower telescopic rod (6) is hinged on the sliding block (17), a support leg is arranged downwards between a hinge shaft of a block body of the non-return pawl (18) and pawl teeth or a boss bulge (19) is arranged at the bottom of the shell, when the sliding block falls, the support leg below the block body of the non-return pawl (18) contacts the bottom of the shell in advance, the non-return pawl (18) is lifted by an angle when the sliding block (17) contacts the bottom, the pawl teeth are separated from the lower telescopic rod rack (16) on the lower telescopic rod (6), and the lower telescopic rod (6) can slide up and down; when the sliding block (17) is rotated from the bottom surface of the shell, the non-return pawl (18) falls back by an angle to be meshed with the upper and lower telescopic rod racks (16) of the lower telescopic rod (6), when the sliding block (17) is continuously lifted, the lower part of the block body of the non-return pawl (18) is blocked and does not fall back by the angle, and the ratchet is synchronously lifted and presses the lower telescopic rod (6) upwards.

5. The anti-heads-down device of claim 1, wherein: the compaction structure is that teeth of a large gear (20) are arranged in the rear piece (2) of the shell and at the rear side of the lower telescopic rod (6) and meshed with a rearward lower telescopic rod rack (16) on the lower telescopic rod (6), a small gear (25) can be meshed with or separated from the large gear (20), a large gear rotating shaft (21) and a small gear rotating shaft (26) of the rotating shafts are respectively arranged on a supporting seat (27) connected with the shell or a shaft hole of the rear piece (2) of the shell, a knob (32) positioned outside the shaft hole on the rear piece (2) of the shell is connected with a small gear rotating shaft (26) of the small gear (25), the knob (32) is pulled or pushed back outwards, and the small gear (25) is separated from or meshed with the large gear (20); and a wheel disc (28) is arranged on the pinion rotating shaft (26), the wheel disc surface of the wheel disc (28) is contacted with the inner wall of the shell when the two gears are meshed, and the contact surface is provided with a check ratchet or is coated with damping oil.

6. The anti-heads-down device of claim 5, wherein: the end parts of the gear teeth of the small gear (25) and the large gear (20) which are opposite to each other in the separation state are in a split shape.