KR200331586Y1 - door opening and shutting device - Google Patents

Abstract

The present invention relates to a door opening and closing device, the purpose of which is that the torque of the damper gear is always constant by forming radial oil grooves that do not overlap each other on the bottom of the inner surface of the holder and the bottom of the spur gear so that the opening and closing operation of the door is made smoothly. Torque adjustment is possible by selecting grease of suitable viscosity according to the door weight, and the combination of the holder and the cap is coupled to each other by the fixing pin and the hook to provide a reliable door opening and closing device.

In the door opening and closing device of the present invention, a holder (10) in which a gear groove (13a) in the center of the housing (11) and an oil groove (13b) are formed radially around the gear shaft (13a). ); It is installed in the gear seating groove 13 of the holder 10 and a plurality of gear teeth 21 are formed on the outer surface, and a flange 22 having a diameter larger than this end circle is formed at the lower end of the gear teeth 21. A spur gear 20 having a shaft hole 22a for accommodating the gear shaft 13a at the center of the lower surface of the flange 22 and a radial oil groove 22b formed around the shaft hole 22a; It is characterized by consisting of a cap 30 is fixed to the holder 10 is covered with a rotatable state wrapped around the flange 22 of the spur gear 20 installed in the gear seating groove 13 of the holder 10.

Description

Door opening and closing device

The present invention relates to a door opening and closing device of most home appliances including an acoustic device, and more particularly, the opening and closing operation of the door is made smoothly by a small damper gear and the torque of the damper gear is always constant. The present invention relates to a door opening / closing device which is capable of adjusting torque by selecting grease of suitable viscosity according to weight, and securing holder and cap securely.

In general, most home appliances, including various audio equipment is provided with a door for inserting and taking out a tape or disk, the door is elastically installed by a spring to open and close while rotating around the axis (hinge). have.

As the door is elastically installed as described above, a rapid movement occurs when the door is opened, and such rapid movement is caused by an impact on the product and the door, and noise is generated. In particular, when the impact is repeated, the structurally weak shaft is broken. There was this.

In order to solve the above problems, the door is proposed to open slowly and smoothly, which is disclosed in the 'door opening and closing device' of Korean Utility Model Publication No. 1991-0009268 (Registration No. 20-0064909). In a known gear having a sector gear formed therein and a spur gear of a damper engaged with the sector gear, the damper is filled with a viscous silicone oil in the case and a rotary rod is inserted therein to cover the two oil rings together. After fixing the spur gear to the end of the fixed insertion rod of the rotating rod protruding through the top of the cover.

In the Utility Model Publication configured as described above, since the door is slowly and smoothly opened at a low speed, there is an advantage that the impact does not occur and thus does not adversely affect other parts, but the case, the rotating rod, the spur gear, etc. Including 6 parts, the number of parts and 4 or more injection molds are needed to increase the cost. Especially, the silicon oil filled inside the case and the lower surface of the rotating rod are simply contacted and rotated, so the damper gear There was a problem in that constant torque of the in- spur gear could not be obtained and torque adjustment (adjustment of damper amount) was impossible.

In addition, the Korean Utility Model Publication No. 94-4215 is a housing having a central axis and a damper gear shaft in the center is integrally formed in the bracket and a housing cap having a damper gear in the damper gear shaft of the housing is assembled.

In the above-mentioned Utility Model Publication, it is possible to simplify the assembly and manufacturing process and reduce the cost and improve productivity due to the two component parts, the housing cap having the bracket and the housing cap having the damper gear. There was a problem in that it was not provided at all in the adjustable means (constitution) and thus could not function as a damper gear.

The purpose of the present invention is to research and develop in order to solve the conventional problems as described above, by forming radial oil grooves do not overlap each other on the bottom of the inner surface of the holder and the bottom of the spur gear so that the opening and closing operation of the door is made smoothly. The torque of the damper gear is always constant, torque can be adjusted by selecting grease of suitable viscosity according to the door weight, and the combination of holder and cap is combined with each other by the fixing pin and hook to provide a secure door opening and closing device. have.

1 is a structural diagram of a device body to which a door opening and closing device according to the present invention is applied,

Figure 2 is a plan view showing a door opening and closing device that is the main part of the present invention,

3 is an exploded perspective view of the door opening and closing apparatus according to the present invention,

4A is a cross-sectional view taken along the line A-A of FIG. 2;

4B is a cross-sectional view taken along line B-B of FIG. 2;

Figure 5a is a plan view showing only the holder in the door opening and closing device of the present invention,

Figure 5b is a bottom view showing only the spur gear in the door opening and closing device of the present invention,

Figure 6a is a bottom perspective view of another embodiment of the cap of the present invention,

6B is a cross-sectional view of the state assembled to the holder using the cap of FIG. 6A.

<Explanation of symbols for main parts of drawing>

10: holder 11: housing

12: Bracket 13: Gear seating groove

13a: gear shaft 13b, 22b: oil groove

14: locking groove 15: fixing pin hole

20: spur gear 21: gear teeth

22: flange 22a: shaft hole

30: Cap 31: Bracket receiving groove

32: fixing pin 33: hook

40: Greece

The door opening and closing device of the present invention for achieving the object as described above, the bracket is formed on both sides of the housing having a gear seating groove and the oil groove is radially centered around the gear shaft and the gear shaft in the gear seating groove. A holder formed in the locking groove at an outer lower end of the housing; It is installed in the gear seating groove of the holder, and a number of gear teeth are formed on the outer surface, a flange having a diameter larger than this end circle is formed at the bottom of the gear teeth, and a shaft hole accommodating the gear shaft in the center of the lower surface of the flange and around the shaft hole Spur gears with radial oil grooves formed therein; It is characterized in that the cover is formed in a rotatable state wrapped around the flange portion of the spur gear installed in the gear seating groove of the holder is fixed to the holder and formed with a hook that is coupled to the hook groove of the housing on the lower inner surface.

The oil groove formed in the gear seat groove of the holder and the lower surface of the spur gear is arranged in a radial shape (for example, four on the holder side and three on the spur gear side) in which the oil grooves are not coincident all at the same time so that a constant torque is always applied. shall.

In addition, the holder has a fixing pin hole formed at the edge of the bracket in contact with the housing, and the cap has a fixing pin protruding at a position corresponding to the fixing pin hole, respectively, and the fixing pin is forcibly fitted in the fixing pin hole and is smaller than the lower surface of the holder. It can also protrude about -1 mm and fuse.

Hereinafter, the door opening and closing device of the present invention will be described in detail with reference to the accompanying drawings.

1 is a structural diagram of a device body to which the door opening and closing device according to the present invention is applied, and the door opening and closing device, which is a damper of the present invention, is installed in the device body (7), which is a household appliance, and the door (8) in the spur gear 20 of the damper. The door 8 is provided to be opened and closed in engagement with the sector gear 8a.

Figure 2 is a plan view of a door opening and closing device that is the main part of the present invention, Figure 3 is an exploded perspective view of the door opening and closing device according to the present invention, Figure 4a is a cross-sectional view of the line AA of Figure 2, Figure 4b is 5B and 5B are diagrams illustrating oil grooves of a holder and a spur gear, which are the main parts of the present invention.

The holder 10 has brackets 12 formed on both sides of the housing 11 having the gear seating grooves 13, and the gear seating grooves 13 have a central gear shaft 13a formed therein. Four oil grooves 13b are formed radially around 13a. Two hook grooves 14 are formed on a lower surface of the housing 11, and a plurality of fixing pin holes 15 are formed at edges of the bracket 12 contacting the housing 11, and the bracket 12 is formed. The fixing hole 12a and the fixing groove 12b for fixing the holder 10 are formed therein.

The spur gear 20 is seated in the gear seating groove 13 of the holder 10 and is rotatably covered by the cap 30, which is formed with a plurality of gear teeth 21 on the outer surface thereof and the gear teeth 21. A flange 22 having a diameter larger than this end circle is formed at the lower end of the circumference, and a shaft hole 22a is formed in the center of the lower surface of the flange 22 to accommodate the gear shaft 13a and around the shaft hole 22a. Three oil grooves 22b are formed radially in the grooves.

The reason why the four and three radial oil grooves 13b and 22b formed on the lower surface of the gear seating groove 13 and the spur gear 20 of the holder 10 is formed in the plane, the gear seating groove 13 This is to prevent the entirety of the three oil grooves 22b of the spur gears 20 from among the four oil grooves 13b of (). The reason why the entire oil grooves 13b and 22b do not coincide is to maintain a constant torque applied to the spur gear 20 at all times.

The torque may be adjusted by changing the viscosity of the grease 40 or the width of the oil grooves 13b and 22b according to the weight of the door. First, the torque adjustment is adjusted to the viscosity of the grease 40, and the grease If the viscosity of (40) is difficult to adjust, it is adjusted by changing the width of the oil grooves 13b and 22b, and the change of the oil grooves 13b and 22b is performed by the core method in the injection mold of the holder 10 and the spur gear 20. It can be adjusted easily.

The cap 30 is covered with a rotatable state by wrapping the flange 22 of the spur gear 20 installed in the gear seating groove 13 of the holder 10 and fixed to the holder 10. The cap 30 has a bracket accommodating groove 31 for accommodating the bracket 12 to surround the upper end to the lower end of the housing 11 at both lower ends, and the cap near the bracket accommodating groove 31 is formed. (30) The fixing pins 32 are formed to protrude at positions corresponding to the fixing pin holes 15 of the bracket 12 at the bottom thereof, and the hook grooves of the housing 11 are formed on the lower inner surface of the cap 30. A hook 33 is caught and locked by 14).

The fixing pin 33 of the cap 30 is preferably made by interference fit in the fixing pin hole 15, the reason is that the holder 10 is securely fixed to the holder 10 to the device body (not shown) This is because force is transmitted from the door 8 when the door is opened by installation. 6A and 6B, the fixing pin 33 protrudes from the lower end of the cap 30 so as to protrude about 0.5 to 1 mm from the lower surface of the holder 10 when assembled to the holder. Of course, the fixing pin 33 protruding from the lower surface may be fused to the holder 10.

The door opening and closing device of the present invention configured as described above is filled with a predetermined amount of grease 40 with an oil groove 13b formed at the bottom of the gear seating groove 13 of the housing 11, and an oil groove at the bottom of the spur gear 20. (22b) Also, the sputter gear 20 is inserted into the gear seating groove 13 of the holder 10 in a state where a predetermined amount of grease 40 is filled, and then the cap 30 in the fixing pin hole 15 of the holder 10. The fixing pin 33 is inserted into the cap 30 to be assembled by pressing.

At this time, the cap 30 is fixed to the fixing pin 33 is inserted into the fixing pin hole 15 of the holder 10 in the fitted state, while surrounding the outer surface of the housing 11, so the cap 30 bottom The lower portion of the cap 30 is inserted into the expanded state by the hook 33 on the inner surface, and then contracts to reach the hook groove 14 so that the hook 33 is locked and locked. When the assembly of the cap 30 is completed as described above, the gear teeth 21 of the spur gear 20 protrude through the cap 30.

The door opening and closing device of the present invention, which is assembled as described above, is installed in the device body 7 using a screw or the like in the fixing hole 12a and the fixing groove 12b formed in the bracket 12 of the holder 10, and The gear teeth 21 of the spur gear 20 rotatably installed in the housing 11 of the holder 10 and the set gear 8a of the door 8 are engaged with each other.

In this state, the door 8 starts to rotate about the axis, and the sector gear 8a of the door 8 rotates, so that the door is opened while rotating the spur gear 20 engaged with the sector gear 8a. do. At this time, the door 8 is gradually opened by the weight of the door to the elastic force of the spring, but the grease (filled in the oil seat (13b, 22b) of the gear seating groove 13 and the lower surface of the spur gear 20 of the housing 11 ( The viscosity of 40 causes the door 8 to open while the spur gear 20 rotates slowly from beginning to end.

In other words, after the force for opening / closing the door 8 is relieved to some extent by the viscosity of the grease 40 filled between the housing 11 of the holder 10 and the spur gear 20, the self-weight of the door to the elastic force of the spring. Only by the weight of the door to the elastic force of the spring will be opened slowly.

As discussed above, the door opening and closing device of the present invention has a radial oil groove that does not overlap each other on the bottom of the inner surface of the holder and the bottom of the spur gear so that the opening and closing operation of the door is smoothly performed. It is always useful to maintain a constant, torque adjustment is possible by selecting a grease of the appropriate viscosity according to the door weight, and the combination of the holder and the cap is a useful design that the fixing is secured by mutually coupled by the fixing pin and the hook.

Claims (3)

Brackets 12 are formed on both sides of the housing 11 having the gear seating grooves 13, and the gear seating grooves 13 are radially centered around the gear shaft 13a and the gear shaft 13a. An oil groove (13b) is formed and the holder (10) formed in the locking groove (14) on the outer bottom of the housing (11); It is installed in the gear seating groove 13 of the holder 10, and a plurality of gear teeth 21 are formed on the outer surface, and a flange 22 having a diameter larger than this end circle is formed at the lower end of the gear teeth 210. A spur gear 20 having a shaft hole 22a for accommodating the gear shaft 13a at the center of the lower surface of the 22 and a radial oil groove 22b around the shaft hole 22a; The flange 22 of the spur gear 20 installed in the gear seating groove 13 of the holder 10 is covered in a rotatable state to be fixed to the holder 10, and a hook groove of the housing 11 on the lower inner surface thereof. Door opening and closing device, characterized in that consisting of a cap 30 is formed with a hook (33) coupled correspondingly. According to claim 1, wherein the holder 10 has a fixing pin hole 15 is formed in the edge of the bracket 12 in contact with the housing 11 and the cap 30 in the position corresponding to the fixing pin hole 15, respectively Door opening and closing device characterized in that the fixing pin 32 is formed protruding. The spur gear according to claim 1, wherein the oil grooves 13b and 22b are viewed in a plane such that the oil grooves 13b and 22b are maintained in a state where constant torque is applied to the spur gear 20 at all times. Door opening and closing device, characterized in that all the oil grooves (22b) of 20 is arranged and formed in a non-matching radial number.