Door closer

Abstract

To provide a door closer that can suppress changes in its operating state over time. [Solution] The door closer comprises an elastic body 7 that constantly generates a biasing force to one side in the longitudinal direction, a trigger part 8 connected to the other side in the longitudinal direction of the elastic body 7 that engages with a guide pin formed in the door when it moves to one side and disengages from the guide pin at a predetermined position when it moves to the other side, a damper 9 having a rod 11 that retracts when it moves to one side together with the trigger part 8 and extends when it moves to the other side, an engagement / disengagement control unit 10 that controls the engagement and disengagement of the trigger part 8 and the guide pin when the trigger part 8 moves, and an opening forming part that forms an opening for the guide pin to enter and exit, and is configured so that the opening forming part and the trigger part 8 do not engage with each other. The opening forming part and the trigger part 8 do not slide against each other, and it is possible to suppress changes in the shape of the trigger part 8 and the opening forming part over time.

Description

Technical Field

[0001] The present invention relates to a door closer, and more particularly to a door closer capable of suppressing changes in operating state over time.

Background Art

[0002] Conventionally, various configurations have been proposed as door closers for sliding doors. For example, in Patent Document 1, a locking body provided to be locked to a locked body of a traveling body and movable together with the locked body, a damper in which a protruding end of an operating rod abuts against the locking body, a coil spring arranged in the same direction as the damper and tension-biasing the locking body at one end side, and an adjusting body for the biasing force of the coil spring are provided, the adjusting body includes an operating screw having one end connected to the other end of the coil spring and a first gear in the form of a bevel gear screwed to a middle portion thereof, and an operating portion including a second gear in the form of a bevel gear meshing with the first gear, a traveling control device is disclosed in which an operating surface of the operating portion is exposed on an outer surface of the device.

[0003] In the same document, since the operation of the operating portion can be performed from the outside by an operating surface exposed on the outer surface of the cover, it is described that adjustment can be made while confirming the closing operation of the sliding door. However, in the traveling control device described in Patent Document 1, the locking body is configured to be used as a guide for engaging and disengaging the cover with the locked body. Therefore, the engagement and disengagement between the locking body and the locked body are performed in a state where the locking body and the cover are always engaged. In other words, the opening forming portion of the cover and the locking body are in a sliding state when the locking body moves.

[0004] Therefore, in the traveling control device (door closer) of Patent Document 1, the opening forming portion and the locking body (trigger) are configured such that their shapes change over time due to sliding, and there is a risk that the engagement and disengagement positions between the locking body and the locked body (guide pin) change over time. Furthermore, depending on the wear condition of the locking body, there is a concern that the locking body may detach from the opening and become stuck inside the travel control device. Furthermore, powder generated by the sliding motion between the opening-forming part and the locking body may adhere to the rod or other parts, potentially hindering the opening and closing operation of the door. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 7231897 [Overview of the project] [Problems that the invention aims to solve]

[0006] This invention was made to solve the above-mentioned problems and aims to provide a door closer that can suppress changes in its operating state over time. [Means for solving the problem]

[0007] According to this invention, the door closer comprises an elastic body, a trigger section, a damper, a locking / unlocking control section, and an opening forming section, as described below. An elastic body constantly generates a biasing force toward one side in the longitudinal direction. The trigger is connected to the other side of the elastic body in the longitudinal direction, engages with a guide pin formed in the door when moving to one side, and disengages from the guide pin at a predetermined position when moving to the other side.

[0008] The damper has a rod that compresses when moving to one side along with the trigger and extends when moving to the other side. The engagement / disengagement control unit controls the engagement and disengagement of the trigger unit and the guide pin when the trigger unit moves. The opening-forming section forms an opening through which the guide pin enters and exits. In this configuration, the door closer is designed so that the opening forming portion and the trigger portion do not engage with each other. [Effects of the Invention]

[0009] The door closer is designed so that the opening forming portion and the trigger portion do not engage with each other. As a result, the opening-forming portion and the trigger portion do not slide against each other, and changes in the shape of the trigger portion and the opening-forming portion over time can be suppressed. As a result, changes in the operating state of the door closer can be suppressed. [Brief explanation of the drawing]

[0010] [Figure 1] (a) Plan view of the door closer, (b) Plan view of the main body, (c) Plan view of the cover, and (d) Plan explanatory diagram of the cover. [Figure 2] (a) A plan view diagram and (b) a left side view diagram illustrating the relationship between the cover and the guide section. [Figure 3] (a) A top view of the main body, (b) A front view of the main body, (c) A rear view of the main body, and (d) A bottom view of the main body, when the trigger is located furthest to one side.

[0011] [Figure 4] (a) A top view of the main body, (b) A front view of the main body, (c) A rear view of the main body, and (d) A bottom view of the main body, when the trigger is located furthest to the other side. [Figure 5] (a) A plan view of the main body when the trigger is located furthest to one side, (b) A plan view of the main body when the trigger is in an intermediate position, and (c) A plan view of the main body when the trigger is located furthest to the other side, showing the relationship between the trigger and the guide pin. [Figure 6] (a) Front view of the trigger section, (b) Front view of the connecting section that connects to the elastic body, (c) Plan view of the connecting section that connects to the elastic body, (d) Front view of the connecting section that connects to the rod, and (e) Front view of the connecting section that connects to the rod. [Figure 7] (a) Plan view of the main body, (b) Cross-sectional view as seen by arrow AA, and (c) Rear view of the elastic body in the biasing force adjustment state.

Best Mode for Carrying Out the Invention

[0012] Hereinafter, the mode for carrying out the invention will be described based on embodiments. Needless to say, the following embodiments disclose a specific example, and it is obvious that the present invention is not limited to the following embodiments.

[0013] [Configuration of Embodiment] The door closer 1 according to an embodiment of the present invention is shown in FIG. 1. The door closer 1 shown in FIG. 1a includes a main body 2 shown in FIG. 1b and a cover 3 that covers the main body 2 shown in FIG. 1c. In addition, a part of the cover 3 is detachable as shown in FIG. 1d, and it is possible to access a part of the main body 2 even when covered by the cover 3. The cover 3 may separately include a fixing portion for fixing to an object.

[0014] In addition, as shown in FIG. 2, the cover 3 includes an opening forming portion 6 that forms an opening O through which the guide pin 5a of the guide portion 5 fixed to the door enters and exits. Here, the opening O is formed in a rectangular shape.

[0015] In FIG. 2(b), since the guide portion 5 is usually provided at the upper part of the door, the arrangement relationship during normal use is generally upside down. In addition, the guide pin 5a is provided so as to be able to protrude and retract by a spring disposed inside the guide portion 5, and the protruding amount is adjusted according to the gap in the upper space.

[0016] As shown in FIGS. 3 to 5, the main body 2 includes an elastic body 7, a trigger portion 8, a damper 9, and a detaching control portion 10, which will be described below. Note that FIG. 3 is a view when the trigger portion 8 is located at the most one side, and FIG. 4 is a view when the trigger portion 8 is located at the most other side. In other words, the trigger portion 8 reciprocates between the positions shown in FIGS. 3 and 4.

[0017] The elastic body 7 constantly generates a biasing force toward one side in the longitudinal direction. As shown in Figures 3(c) and 4(c), the elastic body 7 is a so-called coil spring, with one end fixed and the other end connected to the trigger part 8, and is configured to expand and contract as the trigger part 8 moves.

[0018] The trigger portion 8 is connected to the other side of the elastic body 7 in the longitudinal direction, engages with the guide pin 5a when moving to one side, and disengages from the guide pin 5a at a predetermined position when moving to the other side.

[0019] The trigger portion 8 includes a claw portion 8a with a substantially J-shaped cross-section that can engage with and disengage from the guide pin 5a, and a pair of protruding portions consisting of a cylindrical protruding portion 8b on one side and a protruding portion 8c on the other side that protrudes from the opposite side of the claw portion 8a. Furthermore, the diameters of the protruding portion 8b and the protruding portion 8c are approximately equal. Then, as the protruding portions 8b and 8c move along the engagement / disengagement control unit 10, the claw portion 8a moves and rotates, and the engagement and disengagement with the guide pin 5a is controlled.

[0020] More specifically, when the trigger unit 8 moves to one side, it holds the guide pin 5a as shown in Figure 5(a), and when the trigger unit 8 moves to the other side, it releases the guide pin 5a to the other side at a predetermined position as shown in Figure 5(c).

[0021] The damper 9 is connected to the trigger unit 8 and has a rod 11 that retracts when moving to one side with the trigger unit 8 and extends when moving to the other side. Here, the damper 9 is a so-called hydraulic damper, and the extension and retraction of the rod 11 is performed against the viscous resistance of the oil.

[0022] The engagement / disengagement control unit 10 controls the engagement and disengagement of the trigger unit 8 and the guide pin 5a when the trigger unit 8 moves. Here, the engagement / disengagement control unit 10 forms a crank-shaped slot S whose width is approximately equal to the diameter of the protruding parts 8b and 8c.

[0023] The slot S comprises a side slot Sa that extends linearly along the length on one side, and a other side slot Sb that extends linearly in a direction that forms an angle with the length on the other side. Therefore, the engagement / disengagement control unit 10 has a one-side forming section 10a that forms one-side slot Sa, and a other-side forming section 10b that forms the other-side slot Sb.

[0024] As a result, when the protruding portion 8c of the trigger portion 8 is engaged with the one-sided forming portion 10a, the claw portion 8a holds the guide pin 5a as shown in Figure 5(a). When the guide pin 5a moves to the other side from the state shown in Figure 5(a), the claw portion 8a moves the one-sided forming portion 10a to the other side against the biasing force of the elastic body 7 while remaining engaged with the guide pin 5a, as shown in Figure 5(b).

[0025] Then, the protruding portion 8c enters the other slot Sb, which is at an angle to the length direction, resulting in the state shown in Figure 5(c). In this case, the claw portion 8a rotates around the protruding portion 8b as the pivot point, utilizing the biasing force of the elastic body 7, thereby pushing the guide pin 5a to the other side and disengaging the claw portion 8a from the guide pin 5a. Then, the guide pin 5a, having been disengaged from the claw portion 8a, moves from the opening O to the other side.

[0026] On the other hand, when the guide pin 5a enters the opening O from the other side toward the one side, the claw portion 8a and the guide pin 5a first come into contact, as shown in Figure 5(c). In this case, the claw portion 8a receives a pressing force to one side from the guide pin 5a, causing it to rotate around the protruding portion 8b as the pivot point against the biasing force of the elastic body 7, thereby holding the guide pin 5a. Then, as the protruding portion 8c moves to the slot Sa on one side, the claw portion 8a moves from the other side to the one side using the biasing force of the elastic body 7, as shown in Figure 5(b), resulting in the state shown in Figure 5(a).

[0027] Here, the connection configuration of the elastic body 7, the trigger section 8, and the damper 9 will be explained using Figure 6. As shown in Figure 6, the trigger portion 8 further comprises a connecting portion 8d connected to the other end of the rod 11 of the damper 9, and a connecting portion 8e connected to the other end of the elastic body 7. The connecting portion 8d is fixed to the other end of the rod 11 on one side, and a through hole Td is formed on the other side through which the protruding portion 8b is inserted.

[0028] Furthermore, the connecting portion 8e has a through hole Te formed on one side through which the protruding portion 8b is inserted, and a through hole Tc formed on the other side through which the protruding portion 8c is inserted. The connecting portion 8e is further connected to the other end of the elastic body 7 at a protruding portion Oe that extends on the opposite side from the damper 9. As a result, the claw portion 8a can rotate around the protruding portion 8b as its pivot point, and the connecting portion 8e can also rotate integrally with the claw portion 8a around the protruding portion 8b as its pivot point.

[0029] Here, since the engagement and disengagement state of the trigger portion 8 with respect to the guide pin 5a is controlled solely by the engagement / disengagement control portion 10, there is no need to slide the trigger portion 8 against the opening forming portion 6. Therefore, the opening forming portion 6 and the trigger portion 8 are not engaged.

[0030] The main body 2 further includes an adjustment unit 13 for adjusting the biasing force provided by the elastic body 7, as shown in Figure 7. Specifically, as shown in Figure 7(c), the adjustment unit 13 adjusts the biasing force by changing the fixing position of one end of the elastic body 7, which is a coil spring, thereby adjusting the amount of extension of the elastic body 7. The fixing position of one end of the elastic body 7 is changed using a so-called ratchet mechanism consisting of a ratchet pawl 13a and ratchet teeth 13b, as shown in Figure 7(b).

[0031] More specifically, the ratchet pawl 13a is moved to one side against the biasing force of the elastic body 7 and engages with the ratchet teeth 13b, thereby stretching the elastic body 7 and increasing the biasing force. On the other hand, by flipping up the ratchet pawl 13a, the engagement with the ratchet teeth 13b is released, and the biasing force of the elastic body 7 is used to move the pole 13a to the other side, thereby compressing the elastic body 7 and reducing the biasing force.

[0032] [Effects of the Example] The door closer 1 is designed so that the inner circumference of the opening forming portion 6 and the trigger portion 8 do not engage with each other. As a result, the opening forming portion 6 and the trigger portion 8 do not slide against each other, and changes in the shape of the trigger portion 8 and the opening forming portion 6 over time can be suppressed. As a result, changes in the operating state of the door closer 1 can be suppressed.

[0033] In the door closer 1, the opening O is formed in a rectangular shape. Therefore, it becomes unnecessary to make the opening O a complex shape, making processing easier. Furthermore, since the opening O only needs to be the size necessary for the guide pin 5a to pass through, it is not necessary to make the opening O larger than necessary. This makes it possible to prevent an excessive decrease in the strength of the cover 3 by increasing the size of the opening O.

[0034] Furthermore, the door closer 1 includes an adjustment unit 13 for adjusting the biasing force. This makes it possible to adjust the biasing force provided by the elastic body 7, allowing it to accommodate various dampers 9.

[0035] [Differentiation] This invention can be modified in various ways without departing from its essence. In this embodiment, the adjustment unit 13 is of the ratchet type, but the invention is not limited to this configuration. For example, the configuration can be such that the screw shaft is moved back and forth using a screw threading mechanism, thereby adjusting the amount of extension of the elastic body 7 connected to the shaft. This allows for free selection of the elongation amount of the elastic body 7, unlike the ratchet type which only allows for digital elongation amount selection.

[0036] In this embodiment, the engagement / disengagement control unit 10 is used as the slot formation unit for the slot S, but the engagement / disengagement control unit 10 can also be used as the groove formation unit. This reduces the number of through holes formed in the main body 2, thereby suppressing a decrease in the strength of the main body 2. [Explanation of symbols]

[0037] 1 Door closer 5a Guide pin 6 Opening forming part 7 Elastic body 8 Trigger part 9 Damper 10 Engagement / disengagement control part 11 Rod O Opening

Claims

1. An elastic body that constantly generates a biasing force to one side in the longitudinal direction, A trigger portion is connected to the other side of the elastic body in the longitudinal direction, engages with a guide pin formed in the door when moving to the one side, and disengages from the guide pin at a predetermined position when moving to the other side. A damper having a rod that retracts when moving to one side and extends when moving to the other side together with the trigger portion, A control unit controls the engagement and disengagement of the trigger portion and the guide pin when the trigger portion moves, It comprises an opening forming section that forms an opening through which the guide pin enters and exits, A door closer configured such that the opening forming portion and the trigger portion do not engage with each other.

2. The door closer according to claim 1, wherein the opening is formed in a rectangular shape.

3. The door closer according to claim 1 or 2, further comprising an adjustment unit for adjusting the biasing force.

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