KR200332810Y1 - Control apparatus for length of leg - Google Patents

Abstract

Height adjusting apparatus according to the present invention, the handle portion having a circularly shaped receiving groove, and a tightening shaft protruding from the receiving groove; A through hole formed at a center thereof so that the tightening shaft is inserted and rotatable, and a plurality of locking protrusions protruding at a position spaced apart from the through hole, the locking means being seated in the receiving groove; A tubular lower leg communicating with the through hole, the flow hole into which the tightening shaft is inserted, the locking hole into which the locking projection is inserted, and the second ball seating groove formed at a position spaced apart from the flow hole in the longitudinal direction; It is partially inserted into the lower leg is drawn and received, and has a long guide groove formed in the longitudinal direction at a position corresponding to the flow hole, and a plurality of fixing holes arranged in a position corresponding to the engaging hole on both sides of the guide groove Upper leg; It is provided on the inside of the upper leg, the ball for preventing flow is assembled to have elasticity, the tightening hole is assembled to the tightening shaft through the flow hole and the guide groove, and is spaced on both sides of the tightening hole and locked to a predetermined depth A locking means in which grooves are formed; And, it characterized in that it comprises a departure prevention means assembled to the end of the tightening shaft. This height adjustment device, it is possible to firmly fix the height-adjusted upper leg and lower leg.

Description

Height control device {Control apparatus for length of leg}

The present invention relates to a height adjusting device, and more particularly, the desk and the chair can be changed to various heights by freely adjusting the length of the legs so as to suit the physical condition of the user's desk or chair used by students who are experiencing rapid growth. It relates to a height adjustment device configured to be.

In general, desks and chairs used in schools, academies, and the like are configured with pillar-shaped legs that maintain a constant height while supporting the bottom of a top plate or a seat plate. The legs are configured in plural so that they can be stably supported at the bottom surface. These legs are divided into upper and lower legs so that the length can be variously adjusted, and the height is generally adjusted according to the overlapping range of the upper and lower legs. At this time, in order to maintain the overlapping state of the upper leg and the lower leg is used a variety of height adjustment device.

FIG. 1 is a partial cross-sectional view showing a main portion of a leg formed on a student desk or a stool capable of adjusting the height in one embodiment of the height adjusting device. As shown, the main pipe 1 and the sub pipe 2 having different diameters are partially overlapped. The outer periphery of the main pipe (1) is provided with a plurality of through holes (3), and a single through hole is provided in the secondary pipe (2) having a smaller diameter than the main pipe (1). Then, the position of the through hole (3) is fastened to the pin (6) by pressing the pin (6) fastened to the U-shaped spring (4) provided inside the main pipe (1) and the sub pipe (2) from the outside. It is deformed and configured to adjust the height of the desk and the bench.

The height adjusting device having the above-described configuration includes one of a plurality of holes provided in the main pipe 1 with a pin 6 protruding into the through hole of the sub pipe 2 by the force of the spring 4. By protruding through (3), the auxiliary pipe 2 and the main pipe 2 are kept in a fixed state. As such, the legs consisting of the main pipe (1) and the secondary pipe (2) fixed by the pin (6), when you want to change the length, while pressing the pin (6) through the through hole (3) by applying a pin ( 6) Pull or press the main pipe (1) and the sub pipe (2) to adjust the length. The main pipe 1 and the sub pipe 2 are pulled or pressed until the pin 6 pressed by the inner wall of the main pipe 1 protrudes into the through hole of the desired main pipe 1.

According to the device for adjusting the height as described above, in the process of pressing the pin 6 through the small through-hole (3), it may cause injury to the finger.

In addition, since a plurality of through holes provided in the main pipe are exposed to the outside, contamination by dust or foreign matter is generated.

In addition, the deformation of the spring is caused by the weight of obese students, which are increasing day by day, causing a problem of safety.

An object of the present invention is to solve the various problems as described above, and to provide a height adjustment device configured to adjust the height of the desk or chair easily without a young student injured.

Another object of the present invention is to provide a height adjusting device capable of maintaining a stable posture by firmly fixing the upper leg and the lower leg even when an excessive force is applied from the upper side.

1 is a partial cross-sectional view for showing the main portion of the leg is configured on a conventional student desk or stool adjustable height.

Figure 2 is an exploded perspective view for showing the configuration of the height adjustment device according to the present invention.

3 is a cross-sectional view of the height adjusting device of the present invention.

Explanation of symbols on the main parts of the drawings

30 ..... Height adjustment 31 ..... Handle

31b ..... Tightening shaft 31c .....

33 ..... locking means 33b ..... through hole

33c ..... Locking projection 34 ..... Guide groove

34a ..... 1st ball seating groove 34b ..... end groove

35 ..... locking means 35a ..... ball flow groove

35b ..... Fasteners 35c ..... Locking groove

36, 38 ..... Passage 37 ..... Upper leg

37c ..... Fixing hole 37d ..... Assembly 1

39 ..... Lower leg 39a ..... 2nd ball seating groove

39b ..... Flow Ball 39c ..... Hang Hole

39d ..... 2nd Assembly B ..... Ball for preventing flow

S1, S2 ..... elastomer R ..... fixing bolt

W ..... Washers

Height-adjusting device of the present invention for achieving the object as described above, the handle portion having a circularly shaped receiving groove, and a tightening shaft extending from the receiving groove screwed; A through hole formed at a center thereof so that the tightening shaft is inserted and rotatable, and a pair of locking protrusions protruding horizontally from the tightening shaft at a position spaced apart from the through hole, the locking means being seated in the receiving groove of the handle part; It has a tubular shape, has a flow hole in communication with the through hole is inserted into the tightening shaft, the engaging hole into which the pair of locking projections are inserted, respectively, and the second ball seating groove formed in a position spaced in the longitudinal direction with the flow hole Lower leg; A long guide groove is partially inserted into the lower leg to be drawn out and received, and is formed in a longitudinal direction at a position corresponding to the flow hole, and a plurality of fixing holes arranged at positions corresponding to the engaging holes on both sides of the guide groove. Upper leg having; And, provided on the inside of the upper leg, the ball for preventing flow is assembled to have elasticity, the tightening hole screwed on the inner wall so that the tightening shaft through the flow hole and the guide groove can be tightened or loosened, and both sides of the tightening hole It is characterized in that it comprises a locking means spaced apart in the lock groove is formed to correspond to a predetermined depth.

And, it is preferable to further comprise a departure preventing means assembled to the end to limit the rotatable range of the tightening shaft.

In addition, an assembly groove corresponding to a predetermined depth is formed at the end of the tightening shaft of the handle part so that the separation preventing means can be fastened, and an inner wall of the assembly groove is screwed. The separation preventing means assembled in the assembling groove comprises a washer having a hole formed in the center thereof, and a fixing bolt inserted into the hole of the washer and fastened to the assembling groove. To this end, tightening holes and penetrating assembly holes should be formed in the rear walls of the upper leg and the lower leg, respectively.

On the other hand, it is also possible to form a non-slip projection on the outer wall of the handle portion.

In addition, it is preferable that the locking means partially embeds the elastic body in the through hole, and a stepped jaw is formed in the inner wall of the through hole in which the end portion of the elastic body is in contact. In addition, the protruding portion may be formed to prevent the locking means from being completely in contact with the inner wall of the receiving groove.

The first ball seating grooves are formed in the guide grooves of the upper leg at predetermined intervals, and the first ball seating grooves are arranged in parallel with the fixing holes.

In addition, a ball flow groove corresponding to a predetermined depth is formed in the locking means to protrude and accommodate the ball for preventing flow, and the ball flow groove includes an elastic body. In addition, the elastic body is molded to have an outer diameter gradually increasing toward the inside, and the inner wall of the ball flow groove in which the elastic body is built may be molded to form an inclined surface corresponding to the outer diameter of the elastic body.

In addition, the tightening hole of the locking means is formed on the inner wall of the separation prevention jaw, is screwed forward with respect to the separation prevention jaw, the rear is formed of a larger inner diameter than the front. Then, the assembly is made so that a part of the tightening shaft to be assembled to the tightening hole protrudes to the rear.

Next will be described in more detail the configuration and operation of the present invention based on the embodiment shown in the drawings.

Figure 2 shows a perspective view of the disassembled part of the leg in order to show the height adjustment device according to the present invention, Figure 3 is a partial cross-sectional view showing a cross-sectional view for showing a state where the height adjustment device is assembled according to the present invention. It is.

As shown in the figure, the height adjustment device 30 according to the present invention is configured by separating the legs used for the desk or chair into the upper leg 37 and the lower leg 39, the upper leg 37 is the lower leg The locking means 33 and the locking means 35 are configured to maintain the state accommodated or sunrise at the 39.

First, the lower leg 39 is formed in a tubular shape, and a passage 38 is formed therein, and a plurality of holes are formed in one wall surface. The hole includes a flow hole 39b formed at the center, a pair of engaging holes 39c formed at both sides of the flow hole 39b, and spaced apart by a predetermined interval, and the flow hole 39b and the length thereof. It consists of a second ball seating groove (39a) located on the same line in the direction. On the other hand, the second assembling hole (39d) is formed in the position corresponding to the flow hole (39b) on the other side wall surface formed with the plurality of holes.

Next, the configuration of the upper leg 37 which is partially inserted into the passage 38 of the lower leg 39 and withdrawn and received will be described. The upper leg 37 is formed in a tubular shape, the passage 36 is formed therein, and the guide groove 34 and the wall surface contacting the inner wall in which the flow hole 39b of the lower leg 39 is formed. A plurality of fixing holes 37c arranged on both sides of the guide groove 34 are formed. The guide groove 34 is formed in a long shape in the longitudinal direction of the upper leg 37, the first ball seating groove 34a and the end groove 34b arranged at a predetermined interval is a round groove. . The first ball seating groove 34a is arranged to be parallel to the fixing hole 37c. On the other hand, the first assembling hole (37d) that can communicate with the second assembling hole (39d) of the lower leg 39 is formed on the other side wall surface of the wall on which the guide groove 34 is formed.

The first ball seating groove 34a, the fixing hole 37c, and the first assembly hole 37d formed in the upper leg 37 are formed in the second leg seating groove 39a formed in the lower leg 39. Obviously, the locking holes 39c and the second assembling holes 39d should be configured at the same intervals and corresponding positions.

It will be described in detail the configuration of the locking means 33 and the locking means 35 that the upper leg 37 and the lower leg 39 configured as described above is assembled so that the height is adjustable.

First, the locking means 35 is embedded on the passage 36 of the upper leg 37. The locking means 35 is fastened with the ball flow groove 35a at a position corresponding to the second ball seating groove 39a, the flow hole 39b, and the locking hole 39c which are formed in the lower leg 39. The ball 35b and the locking groove 35c are respectively formed. The fastening hole 35b is formed to penetrate through the locking means 35, is screwed to a predetermined depth on the inner wall, and a release stop 35d is formed on the inner side, and the rear stop is based on the release stop 35d. The inner diameter is wide. In addition, the ball flow groove (35a) has a built-in elastic body (S2), the flow preventing ball (B) is configured to contact the end of the elastic body (S2).

On the other hand, the locking means (33) built in the handle portion 31, the through hole 33b is formed so that the tightening shaft 31b can be passed through the center, the tightening shaft (3) passed through the through hole (33b) A pair of locking projections 33c protruded to be horizontal with 31b) is configured. In addition, a stepped jaw is formed on an inner wall of the through hole 33b, and an elastic body S1 is embedded to contact the stepped jaw.

The locking hole 39c, the fixing hole 37c, and the locking groove 35c respectively configured in the lower leg 39, the upper leg 37, and the locking means 35 to insert the pair of locking protrusions 33c are , Corresponding to the number and position of the locking projection (33c). Therefore, it is natural that the locking hole 39c, the fixing hole 37c, and the locking groove 35c are formed in consideration of the position or number of the locking protrusions 33c. For example, when four locking projections 33c are arranged radially with respect to the through-hole 33b, the locking hole 39c, the fixing hole 37c and the locking groove 35c are respectively flow holes ( 39b), four of the guide grooves 34 and the fastening holes 35b should be radially configured.

Height adjustment device 30 according to the present invention is configured as described above, the passage means 36 of the upper leg 37, the locking means 35 so that the flow preventing ball (B) partially protrudes through the end groove (34b). ) Built in. Then, the upper leg 37 is partially inserted from the upper side through the passage 38 of the lower leg 39. At this time, the upper leg 37 is inserted into the lower leg 39 until the flow preventing ball (B) protruding through the end groove (34b) is seated in the second ball seating groove (39a). Let's do it. In this manner, when the upper leg 37 and the lower leg 39 overlap, the handle part 31 and the locking means 33 are fastened.

The elastic body (S1) is built in the through hole (33b) of the locking means 33, and is accommodated in the receiving groove (31c) of the handle portion (31). At this time, the tightening shaft 31b protrudes through the through hole 33b.

After passing through the protruding tightening shaft (31b) through the flow hole (39b) and the guide groove 34, and grasping the handle 31 and rotated clockwise to tighten along the inner wall of the screwed tightening hole (35b) Fix it.

At this time, the locking means 33 is in contact with the inner wall of the receiving groove 31c by the force pushed by the elastic body S1 in contact with the outer wall of the lower leg 39 while the handle part 31 is rotated. Will be maintained. In addition, the locking means 33 is in close contact with the outer wall of the lower leg 39 in the process of the handle portion 31 is rotated. As a result, the elastic body S1 is maintained in a contracted state, and the locking protrusion 33c is inserted into the locking groove 35c via the locking hole 39a and the fixing hole 37c.

As described above, the upper leg 37 and the lower leg 39 are firmly fixed while the handle part 31 and the locking means 33 are held at a constant length.

In the process of rotating the handle 31 in the counterclockwise direction in the assembled height adjustment device 30, the locking means 33 is spaced apart from the lower leg 39 by the restoring force of the elastic body (S1). Thus, the locking projection 33c of the locking means 33 is separated from the locking groove 35c and the fixing hole 37c. At this time, if the handle portion 31 is continuously rotated in the counterclockwise direction, the locking means 33 and the handle portion 31 may be completely separated from the legs (37, 39). Therefore, it is preferable to configure the separation preventing means in order to limit the rotatable range of the handle portion 31 to prevent the tightening shaft 31b from being loosened more than necessary in the tightening hole 35b.

The separation preventing means for fixing the washer (W) through the second assembly hole (39d) and the first assembly hole (37d) are formed to communicate with the rear side of the lower leg (39) and the upper leg (37). Pass the bolt (R). The fixing bolt R is inserted into the tightening hole 35b and fastened to the assembly groove 31d formed at the end of the tightening shaft 31b. In this way, when the fixing bolt R is assembled, the washer W comes into close contact with the end of the tightening shaft 31b. The washer W is formed to have a wider cross section than the tightening shaft 31b. When the handle 31 rotates counterclockwise, the washer W contacts the release stop 35d of the tightening hole 35b. It becomes impossible. That is, when the handle part 31 is rotated in the clockwise direction and the tightening shaft 31b is completely assembled to the tightening hole 35b, the washer W is spaced apart from the release stop 35d by a predetermined gap G. . In addition, in the process of rotating the handle part 31 in the counterclockwise direction, when the washer W is in close contact with the release stop 35d, the tightening shaft 31b is no longer released from the tightening hole 35b.

At this time, the gap (G) between the washer (W) and the separation prevention jaw (35d) corresponds to the length enough that the locking projection (33c) can be separated from the locking groove (35c) and the fixing hole (37c). desirable. This is to keep the locking projections 33c caught in the locking hole 39c when the upper leg 37 moves freely along the passage 38 of the lower leg 39.

When the knob portion 31 of the height adjustment device 30 according to the present invention is rotated in the counterclockwise direction, the pressed elastic body S1 is gradually restored while keeping the locking means 33 in contact with the receiving groove 31c. Push it to In this process, the locking protrusion 33c is separated from the locking groove 35c and the fixing hole 37c. When the locking protrusion 33c is separated from the locking groove 35c and the fixing hole 37c, it is possible to move the upper leg 37 up and down by the force of the user.

When the locking projection (33c) is out of the fixing hole (37c), the flow preventing ball (B) to prevent the downward flow by the weight of the upper leg (37). This, the flow preventing ball (B) of the lower leg (39) in the state protruding to the outer wall of the upper leg (37) through the end groove (34b) or the first ball seating groove (34a) by the elastic body (S2) It becomes possible by maintaining the state which contacted the inner wall or was pinched in the 2nd ball seating groove 39a.

Desk top plate (not shown) or chair seat (not shown) configured by the user on the upper side of the upper leg 37 in a state in which the handle part 31 of the height adjusting device 30 according to the present invention is rotated counterclockwise. ) Up or down to adjust the desired height. At this time, if the user does not apply a force, the flow preventing ball (B) to maintain the overlapping state of the upper leg 37 and the lower leg (39).

At this time, the guide groove 34 formed in the longitudinal direction is to enable the upper leg 37 to move up and down without being disturbed by the tightening shaft 31b coupled to the locking means 35. In addition, the first ball seating grooves 34a formed at regular intervals along the guide grooves 34 are intended to stably seat the flow preventing balls B protruding upward by the elastic body S2. .

When the upper leg 37 is adjusted to a desired height by a user's force, the handle 31 is tightened clockwise to close the locking means 33 to the outer wall of the lower leg 39. Due to this, the elastic body (S1) is contracted, the locking projection (33c) located in the locking hole (39c) is inserted into the fixing hole (37c) and the locking groove (35c) to the upper leg 37 and the lower leg (39) It will be fixed firmly. Of course, the upper leg 37 and the lower leg 39 may be fixed by inserting the locking protrusion 33c up to the fixing hole 37c, but when an excessive weight or excessive force is applied to the tightening shaft 31b. It is preferable to lock it completely so as to be inserted into the locking groove 35c in order to reduce the force applied excessively.

As described above, the height adjustment device 30 according to the present invention, the guide groove 34 and the plurality of fixing holes (37c) is formed in the upper leg 37 is built into the lower leg (39) It is constructed so that it does not appear outside. In this way, young students can be prevented from getting caught in the process of adjusting their height.

This invention is, of course, within the scope of the basic technical idea, for those of ordinary skill in the art, many other variations are possible, of course. And the present invention should be interpreted based on the appended claims.

The present invention as described above can be expected various effects as follows.

According to the present invention, it is possible to easily adjust the length of the upper leg and lower leg by rotating the handle portion has the advantage that the young student can easily and safely adjust the height of the desk or chair.

In addition, according to the present invention, even when an overweight student uses or momentarily excessive force is applied, the upper leg and the lower leg are firmly fixed by a plurality of locking protrusions, and thus, an advantage of being able to use safely is expected.

In addition, by rotating the handle portion of the height adjustment device attached to a plurality of legs on the desk or chair, even when the tightening shaft is loosened, it is supported by the ball for preventing flow can prevent the upper leg from falling down by its own weight. In addition, even before the tightening of the tightening shaft composed of each of the plurality of legs completely, the state to be adjusted to the desired height by the flow preventing ball can be adjusted easily without the help of other people alone You can expect the effect.

Claims (12)

A handle portion having a circularly shaped receiving groove and a tightening shaft extending from the receiving groove and screwed; A through hole formed at a center thereof so that the tightening shaft is inserted and rotatable, and a plurality of locking protrusions protruding horizontally from the tightening shaft in a position spaced apart from the through hole, the locking means being seated in the receiving groove of the handle part; The lower leg is formed in a tubular shape and has a flow hole in communication with the through hole, into which the tightening shaft is inserted, a catching hole into which the locking projection is inserted, and a second ball seating groove formed at a position spaced apart from the flow hole in the longitudinal direction. Wow; A long guide groove is partially inserted into the lower leg to be drawn out and received, and is formed in a longitudinal direction at a position corresponding to the flow hole, and a plurality of fixing holes arranged at positions corresponding to the engaging holes on both sides of the guide groove. Upper leg having; And, It is provided on the inside of the upper leg, the ball for preventing flow is assembled to have elasticity, the tightening hole screwed on the inner wall so that the tightening shaft through the flow hole and the guide groove can be tightened or loosened, spaced apart on both sides of the tightening hole And height adjustment device characterized in that it comprises a locking means that the locking groove is formed to correspond to a predetermined depth. The height adjusting apparatus according to claim 1, further comprising detachment preventing means assembled at an end of the tightening shaft to define a rotatable range. The height adjusting apparatus according to claim 2, wherein an assembly groove corresponding to a predetermined depth is formed at an end of the tightening shaft so that the separation preventing means can be fastened, and an inner wall of the assembly groove is screwed. 4. The height adjustment according to claim 2 or 3, wherein the separation preventing means comprises a washer having a hole formed in the center thereof, and a fixing bolt inserted into the hole of the washer and tightened in the assembly groove. Device. The height adjusting device according to claim 1, wherein the rear walls of the upper leg and the lower leg are respectively formed with fastening holes and penetrating assembly holes. The height adjusting apparatus according to claim 1, wherein the locking means partially embeds the elastic body in the through hole, and a step is formed in the inner wall of the through hole in which the end portion of the elastic body contacts. The height adjusting apparatus according to claim 1 or 6, wherein the locking means is further formed with a protrusion to prevent full contact with the inner wall of the receiving groove. The height adjusting device according to claim 1, wherein the first ball seating grooves are formed in the guide grooves of the upper leg at predetermined intervals, and the first ball seating grooves are arranged at the same intervals of the fixing holes. The height adjusting device according to claim 1, wherein a ball flow groove corresponding to a predetermined depth is formed in the locking means to protrude and receive the ball for preventing flow, and the ball flow groove has an elastic body embedded therein. 10. The height control of claim 9, wherein the elastic body is formed to gradually increase in outer diameter toward the inner side, and the inner wall of the ball flow groove in which the elastic body is built is formed to form an inclined surface corresponding to the outer diameter of the elastic body. Device. The height adjustment device according to claim 1, wherein the fastening hole of the locking means is formed with a separation prevention jaw on the inner wall, is screwed forward based on the separation prevention jaw, and the rear is formed with a larger inner diameter than the front. . 12. The height adjusting apparatus according to claim 1 or 11, wherein the tightening hole is assembled such that an end portion of the tightening shaft protrudes by a predetermined distance G from the release prevention jaw.