JP4809323B2 - Hinge to prevent dust generation - Google Patents

Description

  The present invention relates to a hinge capable of preventing generation of dust due to wear or the like. The hinge of the present invention is suitable for use in a clean room or the like in a semiconductor manufacturing facility, a food sanitation environment facility, or the like, but it can of course be used in general.

  In general, a hinge is formed by connecting two metal blade members each having an axial tube portion at an end thereof, and penetrating a metal pivot through each shaft tube portion. One of the members is fixed to the door frame side of the doorway, and the other is fixed to the door side. Between the shaft tube portions of the two metal blade members, the weight of the door is applied. When the door is opened and closed, both the metal blade members are rubbed and worn to generate metal dust. Such metal dust floats in the air and causes a decrease in cleanliness in the clean room.

  In order to solve this problem, conventionally, metal hinges used in clean rooms are provided with synthetic resin bushes where metal members contact each other to prevent metal members from being worn and metal dust generated. Yes.

The metal hinges for the clean room using this synthetic resin bushing can be opened and closed smoothly by its weight, and the synthetic resin bushing is not worn due to friction with metal members. Have been devised. For example, the second bush or washer made of synthetic resin that is paired with the bush is provided on the surface where the bush directly rubs against the metal member, or the bush and the metal member are fixed by mounting the bush. The invention has been devised to reduce the friction of the material as much as possible (see Patent Documents 1 to 3 below).
JP 2000-204832 A JP 2001-152727 A JP 2004-183321 A

  It is said that metal dust is still generated by the hinges as described above. It is an object of the present invention to provide a hinge that is devised so as to reduce the generation of metal dust and not to scatter it even if it occurs.

  The hinge for preventing dust generation according to the present invention includes an upper blade shaft tube portion attached to the edge of the upper blade, a lower blade shaft tube portion attached to the edge of the lower blade, an upper blade shaft tube portion, and A hinge having a shaft portion that penetrates the lower blade shaft tube portion, and one of the upper blade shaft tube portion and the lower blade shaft tube portion is rotatable with respect to the shaft portion; The upper and lower ends of the blade shaft tube are sealed (Claim 1).

  The rotating blade shaft tube portion may have a double structure including a shaft tube portion obtained by curling the blade plate and a pipe accommodated in the tube portion (Claim 2). .

  In another aspect, the hinge for preventing dust generation according to the present invention is fixed to the upper blade shaft tube portion attached to the edge of the upper blade and the upper blade shaft tube portion, and downward from the upper blade shaft tube portion. And a lower blade shaft tube portion rotatably fitted to the protruded shaft portion, wherein the upper blade shaft tube portion and the lower blade shaft tube portion A gap is provided therebetween, and an upper end and a lower end of the lower blade shaft cylinder portion are hermetically sealed (Claim 3).

  The lower blade shaft tube portion may have a double structure including a shaft tube portion obtained by curling a blade plate and a pipe accommodated in the tube portion.

  In the first and second aspects of the present invention, the upper and lower ends of the shaft tube portion are sealed, so that metal dust is not scattered from above and below the shaft tube portion. In the case of the prior art, metal dust was scattered from the upper and lower portions of the shaft tube portion to the surroundings.

  Furthermore, according to the second and fourth aspects of the present invention, by using the pipe, a special effect is obtained in that the shaft cylinder portion is close to a perfect circle and the machining is facilitated, and the accuracy is improved.

  According to the third and fourth aspects of the present invention, metal dust is not scattered as the door is opened and closed by the following mechanism.

(1) Since the shaft portion is fixed inside the upper blade shaft tube portion, metal dust is not scattered downward from the upper blade shaft tube portion. In the case of the prior art, since the shaft portion protrudes upward from the male shaft tube portion and is covered with the female blade plate, the metal dust generated from this fitting portion has fallen downward.

(2) Since a gap is provided between the upper blade shaft tube portion and the lower blade shaft tube portion, metal dust generated by rubbing the both does not occur. If it was a prior art, the metal dust was scattered from the contact part of an upper blade shaft cylinder part and a lower blade shaft cylinder part to the circumference | surroundings.

(3) Since the upper end and the lower end of the lower blade shaft tube portion are sealed, metal dust is not scattered from above and below the lower blade shaft tube portion. In the case of the prior art, metal dust was scattered from the upper and lower portions of the lower blade shaft tube portion to the surroundings.

  Preferably, a thrust bearing and a needle bearing are provided between the lower blade shaft tube portion and the shaft portion. Thrust bearings can reduce wear and support vertical loads, and needle bearings can reduce wear and support horizontal loads (claim 5).

  When the lower blade shaft tube portion has a double tube structure consisting of a shaft tube portion obtained by curling the blade plate and a pipe accommodated inside the tube portion, between the pipe and the shaft portion, A thrust bearing and a needle bearing can be provided.

  Preferably, the upper end of the lower blade shaft cylinder is sealed with at least one of a steel ring, a felt ring, and an oil seal. The lower end of the lower blade shaft cylinder is sealed with a plug.

  When the lower blade shaft cylinder part has a double structure consisting of a shaft cylinder part obtained by curling the blade plate and a pipe accommodated inside the cylinder part, the upper end of the pipe is a steel ring, a felt ring, Sealed with at least one of an oil seal and a flange. The lower end of the pipe is sealed with at least one of a plug and a lower lid.

  More preferably, the gap between the lower blade shaft tube portion and the shaft portion is filled with grease (claim 9). Thereby, the generated dust is also confined in the grease.

  When the lower blade shaft tube portion has a double structure consisting of a shaft tube portion obtained by curling the blade plate and a pipe accommodated inside the tube portion, the gap between the pipe and the shaft portion is filled with grease. (Claim 10).

  Further, it is preferable that the narrowed portion where the curled curved surface of the lower blade shaft tube portion and the lower blade intersect is sealed by welding (claim 11). This is because the metal dust can be prevented from leaking out from the intersecting constriction.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view of the first embodiment. FIG. 2 is a plan view of the hinge of the present embodiment. FIG. 3 is a front view of the hinge of the present embodiment. 4 is a cross-sectional view taken along line 4-4 of FIG.

  As shown in FIG. 1, an upper blade shaft cylinder portion 11 is attached to an edge of the upper blade 10. A shaft portion 20 is fixed inside the upper blade shaft tube portion 11, and the shaft portion 20 projects downward from the upper blade shaft tube portion 11. The lower blade shaft cylinder portion 31 is rotatably fitted to the protruding shaft portion 20. The lower blade shaft cylinder portion 31 is attached to the edge of the lower blade 30. That is, the shaft portion 20 protrudes downward from the upper blade shaft cylinder portion 11 which is the male side, and is covered with the lower blade shaft tube portion 31 which is the female side.

  The protruding shaft portion 20 is provided with an upper step portion 21, a ring-shaped groove 22, a central step portion 23, and a lower step portion 24, and a short diameter tip 25 is formed.

    As shown in FIG. 4, the lower end of the lower blade shaft cylinder portion 31 is sealed by screwing a plug 40. In this state, a gap 41 is provided so that the upper blade shaft cylinder portion 11 and the lower blade shaft tube portion 31 are not in contact with each other to generate metal dust.

  An upper step 35, a center step 36, and a lower step 37 are provided on the inner surface of the lower blade shaft tube portion 31. An opening 49 is provided at the center of the surface of the lower blade shaft cylinder portion 31, and the set screw 50 inserted therein is engaged with the ring-shaped groove 22, thereby preventing the lower blade 30 from falling off. Further, the intersection narrowed portion (38 in FIG. 2) between the curled curved surface of the lower blade shaft tube portion 31 and the lower blade 30 is sealed by welding.

  A thrust bearing 42 is disposed on the plug 40, thereby reducing wear and supporting a vertical load. The thrust bearing 42 is set in a space formed by the lower step portion 37 in the shaft tube portion.

  The upper end of the lower blade shaft cylinder portion 31 is also sealed so as not to generate metal dust. From above, a steel ring 43, a felt ring 44, an oil seal 45, a needle bearing 46, and an upper lid 51 are provided. The steel ring 43, the felt ring 44, the oil seal 45, and the upper lid 51 are for sealing, and the needle bearing 46 reduces wear and supports a lateral load.

  The steel ring 43, the felt ring 44, and the oil seal 45 may be disposed in close contact with each other. These sealing means and the needle bearing 46 can be separated by an upper step portion 35 formed in the shaft tube portion. The needle bearing 46 is set in a space formed by the central step portion 36 in the shaft tube portion.

  A gap between the lower blade shaft cylinder portion 31 and the shaft portion 20 is filled with grease 48. This is because oil is supplied to the contact portion and the generated metal dust is confined.

  FIG. 5 is an exploded perspective view of the second embodiment. FIG. 6 is a plan view of the hinge of the present embodiment. FIG. 7 is a front view of the hinge of the present embodiment. 8 is a cross-sectional view taken along line 8-8 in FIG. In the second embodiment, “A” is added to the reference numerals of the components that perform the same operation as the first embodiment.

  The second embodiment differs from the first embodiment in the shaft tube portion 31A of the lower blade. The lower blade shaft cylindrical portion 31A has a double structure in which a pipe 32 is inserted into an outer cylindrical portion formed by curling the edge of the lower blade 30A. Accordingly, the lower blade shaft tube portion 31A is thicker and has a larger diameter than the upper blade shaft tube portion 11A (see FIG. 7).

  The structure of the inside of the pipe 32 and the shaft portion 20A is substantially the same as that of the first embodiment, and only different portions will be described. A lower lid 52 is welded to the lowermost end of the lower blade shaft cylinder portion 31A. There is no upper lid (51 in FIG. 1) at the uppermost end of the lower blade shaft cylinder portion 31A, and a flange 33 is provided at the uppermost end of the pipe 32. By screwing a male screw (not shown) into the female screw 34 provided on the flange 33, the pipe 32 and the shaft cylinder portion 31A are integrated in a sealed state.

  Needle bearings 46A and 46B are used in two places at the top and bottom. The lower needle bearing 46B is provided immediately above the thrust bearing 42A.

  In the second embodiment, by using the pipe 32, a special effect is obtained that the shaft cylinder portion is close to a perfect circle and the machining is facilitated, and the accuracy is improved.

It is a disassembled perspective view of the hinge of Example 1. FIG. It is a top view of the hinge of Example 1. It is a front view of the hinge of Example 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. 3. It is a disassembled perspective view of the hinge of Example 2. FIG. It is a top view of the hinge of Example 2. It is a front view of the hinge of Example 2. It is 8-8 sectional drawing of FIG.

Explanation of symbols

10, 10A Upper blade 11, 11A Upper blade shaft tube portion 20, 20A Shaft portion 21 Upper step portion 22 Groove 23 Central step portion 24 Lower step portion 25 Tip 30, 30A Lower blade 31, 31A Lower blade shaft tube portion 32 Pipe 33 Flange 34 Female thread 35 Upper step portion 36 Central step portion 37 Lower step portion 38 Cross constriction portion 40 Plug 41 Gap 42, 42A Thrust bearing 43, 43A Steel ring 44, 44A Felt ring 45, 45A Oil seal 46, 46A, 46B Needle bearing 48, 48A Grease 49 Opening 50 Set screw 51 Upper lid 52 Lower lid

Claims (2)

An upper blade shaft cylinder (11A) attached to the edge of the upper blade (10A);
A lower blade shaft tube portion (31A) attached to an edge of the lower blade (30A);
A shaft portion (20A) fixed inside the upper blade shaft tube portion (11A) and projecting downward from the upper blade shaft tube portion (11A);
A hinge comprising the lower blade shaft tube portion (31A) rotatably fitted to the protruding shaft portion (20A),
The upper and lower ends of the lower blade shaft tube portion (31A) excluding the shaft portion (20A) are sealed,
The lower blade shaft tube portion (31A) has a double structure comprising a shaft tube portion obtained by curling a blade plate and a pipe (32) accommodated inside the tube portion,
A gap (41A) is provided between the upper blade shaft tube portion (11A) and the lower blade shaft tube portion (31A), and between the pipe (32) and the shaft portion (20A). A thrust bearing (42A) and a needle bearing (46A) are provided ;
The gap between the lower blade shaft cylinder (31A) and the shaft (20A) is filled with grease (48);
A hinge for preventing generation of dust, characterized in that a cross-narrowed portion (38A) between the curled curved surface of the lower blade shaft tube portion (31A) and the lower blade (30A) is sealed by welding .   An upper end of the pipe (32A) excluding the shaft portion (20A) is sealed with at least one of a steel ring (43A), a felt ring (44A), an oil seal (45A), and a flange (33), and the pipe The hinge according to claim 1, wherein the lower end of (32A) is sealed with at least one of a plug (40A) and a lower lid (52).