JP3979966B2 - Door hinge unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a door hinge unit suitable for use in a door that opens and closes an opening of a frame such as a copying machine or a printer.
[0002]
[Prior art]
In a copying machine, a printer, and the like, many doors that open and close the opening of a frame are configured such that the upper end falls to the user side with the lower end as a fulcrum.
For this type of door hinge unit, in order to prevent it from suddenly falling to the user side, one that generates resistance when falling to the user side is used. Conventionally, an oil or viscous body is used. Is used (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-34854
[Problems to be solved by the invention]
However, in a door hinge unit using this type of torque limiter, oil or viscous material leaks at high loads or when used repeatedly, which changes the torque characteristics, and soils surrounding areas and printing paper. There was a bug.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a door hinge unit in which there is no leakage of oil or viscous material and torque characteristics do not change.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a door hinge unit according to the present invention includes a case fixed to one of a door hinge mounting portion or a door for supporting a door, and an outer sleeve accommodated in the case so as to be rotatable relative to the case. And an inner sleeve accommodated in the outer sleeve concentrically with the outer sleeve so as to be relatively rotatable with respect to the outer sleeve, and a door hinge mounting portion for supporting the door or the other of the door. A shaft housed in the inner sleeve concentrically with the inner sleeve and rotatably relative to the inner sleeve, and the outer sleeve rotating in one direction relative to the case. One-way clutch means for preventing rotation in the other direction, and the inner sleeve includes the outer sleeve. A torque generating means for generating a predetermined torque that resists the relative rotation, and an angular range in which the inner sleeve can rotate relative to the case is limited within the first angular range. And a second rotation angle range limiting means for limiting an angle range within which the shaft can rotate relative to the inner sleeve within a second angle range. To do.
In the present invention, when the door is opened, only the shaft rotates in the second angle range, and the door can be opened without resistance. When the second angle range is exceeded, the one-way clutch means acts to fix the outer sleeve to the case. Then, the inner sleeve rotates together with the shaft, torque is generated by the torque generating means, and the door is gently opened without falling down. Eventually, the fully opened position of the door is regulated by the first rotation angle range limiting means, and the fully opened state of the door is maintained.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A is a side view of the hinge unit, FIG. 2B is a view as viewed from arrow B in FIG. 1A, FIG. 2 is a view as viewed from arrow C in FIG. 1A, and FIG. FIG. 4B is a sectional view taken along the line BB of FIG. 4A, FIG. 4A is a longitudinal sectional view of FIG. 1B, FIG. 5B is a sectional view taken along the line BB of FIG. Shows a perspective view of the shaft.
1 to 4 show a state where the door is fully opened.
[0007]
The door hinge unit 12 according to the embodiment includes a case 14, a shaft 16, an outer sleeve 18, an inner sleeve 20, a one-way clutch unit 22, a torque generating unit 24, and a first rotation angle range limiting unit 26. The second rotation angle range limiting means 28 is provided.
The case 14 is fixed to, for example, a door hinge mounting portion in the vicinity of an opening of a frame of a copying machine or a printer, the shaft 16 is fixed to a door that opens and closes the opening, and the shaft 16 constitutes a swing support shaft of the door. is doing.
[0008]
In the present embodiment, the case 14 includes a first divided body 32 and a second divided body 34 that can be divided in the longitudinal direction of the shaft 16. In the present embodiment, the case 16, the shaft 16, the first divided body 32, The second divided bodies 34 are all made of synthetic resin.
As shown in FIG. 2 and FIG. 4 (A), the first divided body 32 and the second divided body 34 are formed so that the arc-shaped engagement wall 3202 of the first divided body 32 is an engagement groove of the second divided body 34. By being engaged with 3402, it is non-rotatably coupled.
The first divided body 32 is provided with two attachment flanges 3204, and these attachment flanges 3204 are attached to the door hinge attachment portion. As shown in FIGS. 3 (B) and 4 (A), the first divided body 32 of the first divided body 32 is provided. Since the end and the end of the second divided body 34 are applied to the door hinge mounting portion, the first divided body 32 and the second divided body 34 are attached to the door hinge mounting portion so as not to move in the axial direction.
The second divided body 34 has a cylindrical wall 3403 located inside the first divided body 32, an outer peripheral cylindrical surface 3404 is formed on the outer periphery of the cylindrical wall 3403, and an inner peripheral cylinder is formed on the inner periphery of the cylindrical wall 3403. A surface 3406 is formed.
[0009]
The outer sleeve 18 is accommodated in the case 14 so as to be rotatable relative to the case 14.
The outer sleeve 18 has an outer peripheral cylindrical surface 1804, which is concentric with the outer peripheral cylindrical surface 3404 of the second divided body 34 and has the same diameter as the outer peripheral cylindrical surface 3404.
A coil spring (clutch spring) 2202 is wound around the outer circumferential cylindrical surface 1804 of the outer sleeve 18 and the outer circumferential cylindrical surface 3404 of the second divided body 34 inside the inner circumferential surface of the first divided body 32. Are in pressure contact with the outer peripheral cylindrical surfaces 1804 and 3404 by elastic force. The coil spring 2202 is wound in the direction in which the door is opened, and is further tightened when the door is opened, so that the outer peripheral cylindrical surface 1804 of the outer sleeve 18 and the outer peripheral cylindrical surface 3404 of the second divided body 34 are firmly fixed. In other words, the outer sleeve 18 and the case 14 are configured to be firmly fixed. In the present embodiment, the coil spring 2202 constitutes a one-way clutch means 22 that allows the outer sleeve 18 to rotate in one direction with respect to the case 14 and prevents the outer sleeve 18 from rotating in the other direction. .
[0010]
The inner sleeve 20 is rotatably supported by the inner peripheral cylindrical surface 3406 in the longitudinal half, and the remaining half in the longitudinal direction is concentric with the outer sleeve 18 in the outer sleeve 18. The outer sleeve 18 is accommodated so as to be rotatable relative to the outer sleeve 18.
In the present embodiment, a cylindrical bush 2402 is fitted and fixed to the inner peripheral surface of the outer sleeve 18, and the inner sleeve 20 is press-fitted into the inner peripheral surface of the bush 2402. The cross section of the bush 2402 has a U-shape that is open outward in the radial direction, and the outer sleeve 18 is fitted and fixed to the inner space of the U-shape. Friction torque generating means 24 is configured to generate a predetermined torque (40 Kgf-cm in the present embodiment) that resists the relative rotation when rotating relative to the outer sleeve 18.
In the present embodiment, the outer sleeve 18 and the inner sleeve 20 are both made of sintered metal made of stainless steel, and the bush 2402 is a commercially available product under the trade name “High Blast”, which is a sliding bearing of Oiles Industries Co., Ltd. ing. The bush 2402 is made of polyimide resin, tetrafluoroethylene resin, or these resins so that one side of a metal sheet (mesh metal sheet) made of expanded metal or wire mesh having a number of meshes is filled with the mesh of the metal sheet. After forming the sliding layer made of the mixed material, the metal sheet having the slipping layer formed on one side is cut into strips, and the strip-shaped metal sheet is placed on the inner peripheral side. By forming a cylindrical body having a slit extending from one end surface to the other end surface formed between the butted ends of the metal sheet, and then press molding the cylindrical body, An expanded metal or wire mesh as a base material of a mesh body arranged on the outer peripheral surface side in the radial direction and an expanded metal or wire mesh as a base material of this mesh body are filled. It is manufactured with a flange portion integrally formed at both ends of the cylindrical portion to and a said expanded metal or sliding layer made of one surface which is formed in the synthetic resin of the wire mesh and the cylindrical portion with.
[0011]
As shown in FIG. 4B, the outer peripheral portion of the inner sleeve 20 is formed on a cylindrical surface having a uniform outer diameter, and the outer peripheral portions at both ends in the longitudinal direction of the inner sleeve 20 are three as shown in FIG. About / 4 is cut off, leaving an arc-shaped engagement protrusion 2002.
As shown in FIG. 2, the end wall of each of the first divided body 32 and the second divided body 34 has a semi-cylindrical engagement that allows rotation of the engagement protrusion 2002 within the first angle range. A recess 40 is provided. In the present embodiment, the first angle range is 73.6 degrees.
Therefore, in the present embodiment, the first rotation angle that limits the angle range in which the inner sleeve 20 can rotate relative to the case 14 within the first angle range (a range of 73.6 degrees in the present embodiment). The range limiting means 26 includes an engaging protrusion 2002 and an engaging recess 40.
[0012]
As shown in a perspective view in FIG. 5, the shaft 16 is formed by cutting off both sides in the radial direction of two cylindrical members having different diameters by two planes parallel to each other. A first two-surface portion 1602 having two small cylindrical surfaces and a second two-surface portion 1604 having two large-diameter cylindrical surfaces are configured.
The second two-surface portion 1604 is accommodated in the inner sleeve 20, and the step surface at the boundary between the first two-surface portion 1602 and the second two-surface portion 1604 is at each end of the first divided body 32 and the second divided body 34. By hitting the face wall, it is incorporated so as not to move in the axial direction.
As shown in FIG. 1B, a hole 3212 through which the first two-surface portion 1602 is rotatably inserted is formed in the end face wall of the first divided body 32, and the end face wall of the second divided body 34 is As shown in FIG. 2, a semi-cylindrical groove 3412 that rotatably passes through the first two-surface portion 1602 is formed to communicate with the semi-cylindrical engaging recess 40.
[0013]
An engagement groove 50 is formed through the inner sleeve 20 along the axis thereof, the second two-surface portion 1604 is inserted through the engagement groove 50, and the shaft 16 is inserted into the inner sleeve 20. Concentrically with respect to the inner sleeve 20 is accommodated so as to be rotatable relative to the inner sleeve 20.
The shaft 16 is restricted so as to be able to rotate within the second angle range within the inner sleeve 20. In the present embodiment, the second angle range is 25 degrees.
Therefore, in the present embodiment, the second rotation angle range restriction that restricts the angle range in which the shaft 16 can rotate relative to the inner sleeve 20 within the second angle range (25 degrees in the present embodiment). The means 28 includes the engaging groove 50 and the second two-surface portion 1604.
[0014]
Next, functions and effects will be described.
First, the case where the opening of the frame is opened from the state closed by the door will be described.
For example, the user operates a knob or the like to unlock the locking means that holds the closed state of the door, and pulls the upper end of the door so as to fall forward.
In this case, until the second two-surface portion 1604 of the shaft 16 engages with the engaging groove 50, in the present embodiment, the door falls forward without resistance within a range of 25 degrees (second angle range). Therefore, the initial operation of the opening operation becomes easy and the operability is excellent.
When the angle exceeds 25 degrees, the inner sleeve 20 and the outer sleeve 18 try to rotate integrally with the shaft 16, and at this time, the coil spring 2202 is further tightened, and the outer peripheral cylindrical surface 1804 of the outer sleeve 18 is the second divided body 34. The outer peripheral cylindrical surface 3404 is firmly fixed.
Therefore, when the opening degree of the door exceeds 25 degrees, the inner sleeve 20 rotates integrally with the shaft 16, but resistance due to the bush 2402 (in this embodiment, 40 kgf-cm) is generated, and the user tilts the door forward. Then, the door will not fall down suddenly, but will be brought down gently. Therefore, since the door does not fall down rapidly, the opening operation is easy to perform and the operability is excellent.
When the door is tilted 73.6 degrees (first angle range), the engagement protrusion 2002 of the inner sleeve 20 abuts on the engagement recess 40 of the first divided body 32 and the second divided body 34, The door is finally closed from a state in which the opening is closed to a state in which the door is opened 98.6 degrees, which is the sum of 25 degrees and 73.6 degrees, and the fully opened state of the door is maintained.
[0015]
Next, a case where the door is closed from the opened state will be described.
When the user stands up to lift the door, first, until the second two-surface portion 1604 of the shaft 16 engages with the engaging groove 50, in the present embodiment, a range of 25 degrees (second angular range). Thus, the door is erected by rotating only the shaft 16.
When the second two-surface portion 1604 is engaged with the engagement groove 50, the inner sleeve 20 and the outer sleeve 18 are rotated together with the shaft 16. In this case, the coil spring 2202 is not tightened. Therefore, no resistance is generated by the coil spring 2202, and the door closing operation is smoothly performed.
When the door stands up 73.6 degrees (first angle range), the opening of the frame is closed by the door.
[0016]
According to the present embodiment, the door hinge unit 12 can be configured without using a type of torque limiter in which oil or a viscous material is enclosed.
Therefore, according to the door hinge unit 12 of the present embodiment, it is possible to solve the problem that the peripheral portion and the printing paper are soiled due to the leakage of the oil or the viscous body, and the problem that the torque characteristic changes.
In the present embodiment, the second angle range is set to 25 degrees. However, the second angle range is not limited to 25 degrees, and in order to facilitate the initial operation of the door opening operation, The second angle range is preferably 20 degrees or more and 30 degrees or less.
In the present embodiment, the first angle range is set to 73.6 degrees, but this angle range is changed according to the use of the door that opens and closes the opening, and the door is opened 90 degrees at the minimum and the maximum is set to the maximum. In consideration of opening 180 degrees and considering the second angle range described above, in many cases, the angle is set to 70 degrees or more and 150 degrees or less.
[0017]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a door hinge unit that does not have a problem of soiling peripheral portions and printing paper because there is no leakage of oil or viscous material, and in which torque characteristics do not change. it can.
[Brief description of the drawings]
FIG. 1A is a side view of a hinge unit, and FIG. 1B is a view taken in the direction of arrow B in FIG.
FIG. 2 is a view taken in the direction of arrow C in FIG.
3A is a half front view of the line BB in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line BB in FIG.
4A is a longitudinal sectional view of FIG. 1B, and FIG. 4B is a sectional view taken along line BB of FIG.
FIG. 5 is a perspective view of a shaft.
[Explanation of symbols]
12 Hinge unit 14 Case 16 Shaft 18 Outer sleeve 20 Inner sleeve 22 One-way clutch means 24 Torque generating means 26 First rotation angle range limiting means 28 Second rotation angle range limiting means

Claims (6)

A case fixed to one of the door hinge mounting part or door that supports the door;
An outer sleeve accommodated in the case so as to be rotatable relative to the case;
An inner sleeve accommodated in the outer sleeve concentrically with the outer sleeve and rotatably relative to the outer sleeve;
A shaft that is fixed to the other side of the door hinge mounting portion or the door that supports the door, and is accommodated in the inner sleeve so as to be concentric with the inner sleeve and rotatably relative to the inner sleeve;
One-way clutch means for allowing the outer sleeve to rotate in one direction with respect to the case and preventing the outer sleeve from rotating in the other direction;
Torque generating means for generating a predetermined torque that resists relative rotation when the inner sleeve rotates relative to the outer sleeve;
First rotation angle range limiting means for limiting an angle range in which the inner sleeve can rotate relative to the case within a first angle range;
A second rotation angle range limiting means for limiting an angle range in which the shaft can rotate relative to the inner sleeve within a second angle range;
A door hinge unit characterized by comprising: The outer sleeve has an outer peripheral cylindrical surface, and the case has an outer peripheral cylindrical surface that is concentric with the outer peripheral cylindrical surface of the outer sleeve and has the same diameter as the outer peripheral cylindrical surface of the outer sleeve, and the one-way clutch 2. The door hinge unit according to claim 1, wherein the means comprises a coil spring wound around the outer peripheral cylindrical surface of the outer sleeve and the outer peripheral cylindrical surface of the case and pressed against the outer peripheral cylindrical surface by a resilient force. . The torque generating means comprises a slide bearing disposed between an inner peripheral cylindrical surface of the outer sleeve and an outer peripheral cylindrical surface of the inner sleeve and press-fitted into the cylindrical surface. The door hinge unit according to 1. The first rotation angle range limiting means includes an engagement protrusion formed at at least one end in the axial direction of the inner sleeve, and the engagement protrusion rotates only within the first angle range. The door hinge unit according to claim 1, further comprising an engaging recess formed in the case to be allowed. The second rotation angle range limiting means includes a two-surface portion in which two parallel planes are formed on the shaft, and the inner sleeve that allows the two-surface portion to rotate only within the second angle range. The door hinge unit according to claim 1, wherein the door hinge unit is formed with an engagement groove formed. The door hinge unit according to claim 1, wherein the second angle range is 20 degrees or more and 30 degrees or less.

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