JPH0452829B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a door closer for automatically closing an opened sliding door.

[Conventional technology]

Conventionally, a door closer has been used to automatically close a sliding door after it has been opened.

This door closer is constructed as shown in FIG. That is, the first door is located outside the sliding door and has a lid 1a attached to a fixed part such as a wall.
a cylinder 1, a second cylinder 3 fitted into the first cylinder 1 and fixed to a piston 2 slidably provided in the first cylinder 1; A third cylinder 4 which is slidably fitted into the cylinder 3 and whose outer end is closed.
It is extendably provided within this third cylinder 4, with one end connected to the piston 2 and the other end connected to the third cylinder 4.
A tension spring 5 is attached to each end closing member of the cylinder, and a rope is attached to a flange 6 provided on the second cylinder 3 and passed through a lid 1b provided at one end of the first cylinder 1. 7, a tension spring 8 whose one end is attached to the lid 1a provided at the other end of the first cylinder 1, and whose other end is attached to the rope 7 via a member, and the lid 1a and the piston 2. It consists of an air chamber 9 formed between the two, and an orifice 10 that communicates the air chamber 9 with the outside. Note that oil for lubrication is sealed in the lower part of the air chamber 9. A part of the third cylinder 4 is connected to a sliding door, and when the sliding door is opened, the third cylinder 4 and the second cylinder 3 protrude from the first cylinder 1, and the tension spring 5, 8 is stretched. When the user releases the sliding door, the springs 5 and 8 contract, and the force of these springs pulls the sliding door back to its original position.

(Problem to be Solved by the Invention) However, in conventional door closers, a triple-structured cylinder and two springs are used to shorten the minimum length of the cylinder in the sliding direction. Therefore, the structure is complicated and the cost is high.

An object of the present invention is to provide a door closer that eliminates the above-mentioned drawbacks of conventional door closers.

[Means for solving problems]

In order to achieve the above object, the present invention has the following configuration. That is, a cylinder attached to a case, a piston rod whose one end protrudes telescopically from the cylinder and is always biased in the direction of extension, a pinion rotatably provided at one end of the piston rod, and a first rack that is fixed along the direction of expansion and contraction of the piston rod and meshes with the pinion; and a rack that is located on the opposite side of the first rack across the pinion and is movable in the direction of expansion and contraction of the piston rod. and a second rack that is supported in a state in which movement in other directions is restricted, and meshes with the pinion.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4. Reference numeral 11 in FIGS. 1 and 2 is a case embedded in the sliding door 12 shown in FIG. This case 11 is made of a square tube with a rectangular cross section, and has a pair of holding protrusions 13 projecting inward from the upper part of the case 11 shown in FIGS. 1 and 2. This holding protrusion 13 extends over the entire length of the case 11.

A gas spring 14 inserted into the case 11 is attached to the case 11 by brackets 15, 15. gas spring 14
The piston rod 14a is configured to urge the piston rod 14a in the direction of protruding from the cylinder along the axial direction of the cylinder by the pressure of the gas sealed in the cylinder.

The gas spring 14 has its expansion and contraction direction in case 1.
It is assumed that the length direction is the same as that of 1. A pinion 16 is rotatably attached to the tip of the piston rod 14a via a bracket 14b.

A first rack 17 is provided on one side of the pinion 16, and the first rack 17 is fixed to the other end of the case 11 in the direction of expansion and contraction of the gas spring 14. The first rack 17 is the pinion 1
6 is engaged.

A second rack 18 is provided on the other side of the pinion 16, facing the first rack 17. The second rack 18 has a pinion 16 interposed between it and the first rack 17, is meshed with the pinion 16, and is attached to the case 11 so as to be movable relative to the case 11. Grooves 19, 19 extending in the longitudinal direction of the second rack 18 are formed on both sides of the second rack 18, respectively, and these grooves 19, 19 are slidably attached to the holding protrusions 13, 13 of the case 11. The second rack 18 is held by these holding protrusions 13, 13. Therefore, the second
The rack 18 has grooves 19, 19 fitted in the protrusions 13, 13, thereby restricting movement of the piston rod 14a in the cylinder in directions other than the direction of expansion and contraction.

Therefore, when using the door closer configured as described above, the case 11 is embedded and fixed in the lower part of the sliding door 12 as shown in FIG. do what you can.

When the opening 21 shown in FIGS. 3 and 4 is closed by the sliding door 12,
The tip of the second rack 18 is kept in contact with the wall surface 22. In addition, 23 is a wall (fixed part).

Next, when the sliding door 12 is opened by sliding it in the direction of arrow A in FIG. 3, the second rack 18 is guided by the holding protrusion 13 and moves relative to the case 11. 2's luck 18 comes in. Then, the pinion 16 rotates and moves toward the cylinder of the gas spring 14, and a portion of the piston rod 14a retracts into the cylinder, compressing the gas within the gas spring 14. Release the sliding door 12 (release your hand)
Then, the compressed gas pressure in the gas spring 14 causes the piston rod 14a to protrude from the cylinder of the gas spring 14, and as a result, the second rack 18 protrudes from the case 11 via the first rack 17 and pinion 16, and the sliding door 12 is moved in the direction of arrow B in FIG. 3 to open the opening 21,
It is closed by this sliding door 12.

In the relative movement of the second rack 18 with respect to the case 11 described above, the pinion 16 rotates and moves in the same direction as the second rack 18, so that the second rack 18 moves against the stroke of the piston rod 14a of the gas spring 14. It has twice the stroke. Therefore, according to this embodiment, the door closer has a simple structure and can be embedded in the sliding door, and the sliding door can be automatically and reliably closed after being opened without damaging the appearance. be able to.

Next, another embodiment of the present invention will be described based on FIGS. 5 to 8. Reference numeral 31 in FIGS. 5 and 6 is a case body embedded within the sliding door 32 shown in FIG. The case body 31 is made of a rectangular tube with a longitudinal cross section, and has a pair of holding protrusions 33 projecting inward from the upper part of the case body 31 shown in FIGS. 5 and 6. This holding protrusion 33 extends over the entire length of the case body 31.

A gas spring 34 inserted into the case body 31 is attached to one end side of the case body 31 by brackets 35, 35. The gas spring 34 is configured to bias the piston rod 34a in the direction of protruding from the cylinder along the axial direction of the cylinder by the pressure of the gas sealed within the cylinder.

The gas spring 34 expands and contracts in the same direction as the length direction of the case body 31. A large diameter pinion 36 and a small diameter pinion 37 are rotatably attached to the tip of the piston rod 34a via a bracket 34b. Large diameter pinion 36
is located between the two same small diameter pinions 37, and is provided coaxially and integrally with the small diameter pinions 37.

On the other hand, a fixing rack (first rack) 38 is attached to the other end of the case body 31, located on the opposite side to the holding protrusions 33, 33, and oriented in the direction of expansion and contraction of the gas spring 34. ing. A groove 39 is formed in the widthwise center of the fixing rack 38 over the entire length of the fixing rack 38.
A part of the outer periphery of the large-diameter pinion 36 is fitted into the groove 39 of the fixing rack 38, and is meshed with the small-diameter pinions 37, 37.

On the other hand, on the opposite side of the large-diameter pinion 36 from the fixed rack 38, a moving rack (second rack) 40 is provided facing the fixed rack 38. The movable rack 40 is attached to the case body 31 so as to be movable relative to the case body 31 in a state in which the moving rack 40 is engaged with the large diameter pinion 36 and the fixed rack 38 is engaged with the small diameter pinions 37, 37. There are movable racks 40 on both sides of the movable rack 40, respectively.
Grooves 41, 41 extending in the longitudinal direction are formed, and these grooves 41, 41 are slidably fitted into the holding protrusions 33, 33 of the case body 31. is retained. Therefore, the mobile rack (second rack)
40 is a piston rod 34a in the cylinder by fitting the grooves 41, 41 into the protrusions 33, 33.
Movement in directions other than the direction of expansion and contraction is restricted.

Therefore, when using the door closer configured as described above, the case body 31 is embedded and fixed in the lower part of the sliding door 32 as shown in FIG. Try to get it.

When the opening 42 shown in FIGS. 7 and 8 is closed by the sliding door 32,
The tip of the moving rack 40 is kept in contact with the wall surface 43. In addition, 44 is a wall (fixed part).

Next, when the sliding door 32 is opened by sliding it in the direction of arrow A in FIG.
0 is guided by the holding protrusion 33 and attached to the case body 31.
The movable rack 40 enters into the case body 31. Then, large diameter pinion 3
6. The small diameter pinion 37 rotates and moves toward the cylinder side of the gas spring 34, and a part of the piston rod 34a retracts into this cylinder, compressing the gas inside the gas spring 34. sliding door 3
When you release 2 (let go of your hand), gas spring 3
Gas spring 3 due to compressed gas pressure in 4
A piston rod 34a protrudes from the cylinder No. 4, and thereby the fixing rack 38 and the small diameter pinion 3
7. The moving rack 40 protrudes from the case body 31 via the large-diameter pinion 36, moves the sliding door 32 in the direction of arrow B in FIG.
is closed by this sliding door 32.

Movable rack 40 for the case body 31 described above
In the relative movement, the large-diameter pinion 36, which has a larger diameter than the small-diameter pinion 37 that rotates while meshing with the fixed rack 38, moves in the length direction of the movable rack 40 while rotating coaxially and integrally with the small-diameter pinion 37. Piston rod 3 of gas spring 34
The moving rack 40 has a stroke more than twice that of the moving rack 4a. Therefore, according to this embodiment, the door closer has a simple structure and can be embedded in the sliding door, and the sliding door can be automatically and reliably closed after being opened without damaging the appearance. be able to.

In each of the above embodiments, a case has been described in which one sliding door is opened and closed; however, the case is not limited to this, and the case 11 or the case body 31 is embedded in one of two sliding doors, and the case 11 or the case main body 31 is embedded in the other. By appropriately connecting the two racks 18 or movable racks 40, any of the two overlapping sliding doors can be automatically closed after being opened.

Moreover, the buried location is not limited to the lower part of the sliding door, but may be buried anywhere on the sliding door depending on the situation.

〔Effect of the invention〕

According to the present invention, the structure is simple; the cylinder is installed in the case, the pinion is installed on the piston rod, and the first and second racks that mesh with the pinion are respectively fixed and movably attached to the case. When the second rack moves relative to the case, the pinion moves while rotating, so the stroke of the second rack is expanded relative to the stroke of the piston rod, so the length of the piston rod of the cylinder in the direction of expansion and contraction can be reduced. , Therefore, it can be miniaturized at low cost.

Furthermore, since the movement of the second rack in directions other than the direction of expansion and contraction of the piston rod is restricted, the movement of the second rack is restricted.
The rack will not come off the pinion.

Furthermore, since all the members are supported by the case, they can be attached to the top of the sliding door or other places, so there are no restrictions on where they can be attached.

Furthermore, when the door closer of the present invention is provided between two sliding doors, it is possible to automatically close either of the two sliding doors after opening one of the two sliding doors with one door closer. .

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view, FIG. 2 is a view taken in the direction of the arrows in FIG. Figure 4 shows the state in which it is attached to the
5 to 8 show other embodiments of the present invention, FIG. 5 is a longitudinal sectional view, FIG. FIG. 7 is a diagram showing the door closer of the present invention attached to a sliding door, FIG. 8 is a sectional view taken along the line - in FIG. 7, and FIG. 9 is a longitudinal sectional side view of the conventional door closer. 11...Case, 14...Gas spring, 1
6...pinion, 17...first rack, 18...
...Second rack, 31...Case body, 34...
Gas spring, 36...Large diameter pinion, 37...
...small diameter pinion, 38...fixed rack (first rack), 40...movable rack (second rack).

Claims (1)

[Scope of Claims] 1. A cylinder attached to a case, a piston rod whose one end protrudes telescopically from the cylinder and is always biased in the direction of extension, and a pinion rotatably provided at one end of the piston rod; a first member fixed to the case along the direction of expansion and contraction of the piston rod and meshing with the pinion;
a rack located on the opposite side of the first rack with the pinion in between, and supported by the case in a state where the piston rod is movable in the direction of expansion and contraction and is restricted from movement in other directions; A door closer comprising: a second rack meshing with the pinion. 2. The pinion consists of a first pinion that meshes with the first rack, and a second pinion that meshes with the second rack, and the first pinion and the second pinion mesh with each other.
2. The door closer according to claim 1, wherein the pinion has a diameter different from that of the pinion.