Door closer cover and door closer

Abstract

To achieve both fire resistance and aesthetics.SOLUTION: A cover 12 covering a driving device of a door closer includes: a fall part, at least partly made of resin, including an underside, falling from the driving device in the event of a fire; and a metal residual part left on the driving device in the event of a fire. The residual part occupies at least the majority of a door surface side of an upper surface part. The fall part is made entirely of resin and further includes a front part and left and right side parts. The fall part has a screw boss projecting toward the residual part side, and the fall part is screwed to the residual part by screwing a screw 17 into the screw boss.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a door closer cover and a door closer. [Background technology]

[0002] The present applicant has proposed a door closer equipped with a cover that covers a drive unit, as in Patent Document 1 below.

[0003] If the cover is made of resin, it can have a good appearance. However, there is a possibility that the cover will burn in the event of a fire. On the other hand, if the cover is made of metal, it will not burn, but it is difficult to have a good appearance and the cost is likely to increase. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-183534 A Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a door closer cover and a door closer that can achieve both fire resistance and aesthetic appearance. [Means for solving the problem]

[0006] The door closer cover of the present invention is a cover that covers the drive unit of the door closer, includes a bottom surface portion, at least a portion of which is made of resin, and has a drop portion that falls from the drive unit in the event of a fire, and a metal remaining portion that remains on the drive unit in the event of a fire.

[0007] According to this configuration, the cover has a falling portion that falls from the drive device in the event of a fire and a remaining portion that remains on the drive device. The falling portion includes the underside of the cover. Therefore, when the falling portion falls in the event of a fire, the resin portion of the falling portion does not ignite early. Furthermore, when the falling portion falls in the event of a fire, the underside of the cover is opened. Since the underside of the cover is opened, even if a part of the drive device melts in the event of a fire, it does not remain inside the underside of the cover and ignite. Furthermore, the remaining portion is made of metal, and the remaining portion will not ignite in the event of a fire.

[0008] In particular, it is preferable that the remaining portion occupies at least a large portion of the door surface side of the upper surface portion, and the falling portion is made entirely of resin and further includes a front portion and left and right side portions. With this configuration, the main portions of the cover, namely the lower surface portion, front portion, and left and right side portions of the cover, can be easily manufactured from resin. The main portions of the cover are portions that are easily visible when viewed from below. Because the main portions of the cover are made of resin, a good aesthetic appearance is easily achieved. In addition, the cover can be easily made lighter. Meanwhile, because the remaining portion occupies a large portion of the door surface side of the upper surface portion of the cover, it is possible to prevent the resin falling portion from remaining on the upper surface of the drive device in the event of a fire.

[0009] Furthermore, it is preferable that the dropped portion has a screw boss protruding toward the remaining portion, and the dropped portion is screwed into the screw boss so that the dropped portion is fixed to the remaining portion by a screw. With this configuration, since the resin screw boss protrudes toward the remaining portion, the temperature of the screw boss is likely to rise. Therefore, in the event of a fire, the screw boss melts quickly and the dropped portion separates from the remaining portion and drops.

[0010] Furthermore, the door closer of the present invention is a door closer comprising a drive unit for driving a door and a cover for covering the drive unit, the cover including a lower surface portion, at least a portion of which is made of resin, and has a drop portion that falls from the drive unit in the event of a fire, and a metal remaining portion that remains on the drive unit in the event of a fire. Effect of the Invention

[0011] As described above, the cover has a hybrid structure of resin and metal, which makes it possible to achieve both fire resistance and aesthetic appeal. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic diagram showing a state in which a door closer in one embodiment of the present invention is attached to a right-opening door. [Diagram 2] 1 is a schematic diagram showing the door closer installed on a left-opening door. [Diagram 3] FIG. 4 is a perspective view showing the right-opening version of the door closer. [Figure 4] FIG. [Diagram 5] FIG. 4 is a perspective view showing the main body with the cover removed. [Figure 6] 6 is a cross-sectional view of a portion of the main body corresponding to line AA in FIG. 5. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 4 is a perspective view showing a main body cover of the body cover. [Figure 10] FIG. 4 is a plan view showing a sub-body cover of the body cover. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] A hypothetical diagram of what would happen if the unit were to catch fire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A door closer and its cover according to one embodiment of the present invention will be described below with reference to Figs. 1 to 13. The door closer in this embodiment is an electric door closer that opens and closes a door electrically. Fig. 1 shows a right-opening (right-handed) door 1, and Fig. 2 shows a left-opening (left-handed) door 1. The door 1 is rotatably attached to a door frame 2 via a hinge (not shown), and rotates around an axis in the vertical direction.

[0014] <Overall composition> The door closer in this embodiment is compatible with both left and right opening doors, but the right-opening version will be mainly described. Fig. 3 shows the overall configuration of a right-opening door closer. The door closer comprises a main body 3 and a link mechanism. The main body 3 is attached to the door 1. The main body 3 is attached to the upper part of the front surface of the door 1, near the hinge. The link mechanism connects the main body 3 and the door frame 2. The link mechanism comprises an arm 4, a link 5, and a bracket 6.

[0015] The main body 3 is equipped with a drive shaft 20 that rotates about an axis in the vertical direction, and one end of an arm 4 is connected to the upper end of the drive shaft 20. The arm 4 rotates integrally with the drive shaft 20 around the drive shaft 20. The other end of the arm 4 is rotatably connected to one end of a link 5, and the other end of the link 5 is rotatably connected to a bracket 6. The bracket 6 is attached to the door frame 2 (upper frame).

[0016] 4 to 6 show the main body 3 that opens from the right. The main body 3 has a rectangular parallelepiped shape that is long in the left-right direction. The left-right direction is the radial direction with respect to the rotation axis of the door 1. The main body 3 includes an attachment plate 10 for attaching the main body 3 to the door 1, a main body unit 11 that is attached to the attachment plate 10, and a cover 12 that covers the main body unit 11 from the front side (front side).

[0017] <Mounting plate 10> The mounting plate 10, together with the cover 12, constitutes the outer shell (casing) of the main body 3. The outer shell of the main body 3 is composed of six walls, and the mounting plate 10 constitutes the wall on the back side (rear side) of the six walls of the outer shell. The mounting plate 10 covers the back side of the main unit 11. The mounting plate 10 is rectangular in shape that is long in the left-right direction. The mounting plate 10 is formed with screw insertion holes (not shown) for screwing to the door 1, and can be attached to both the left-opening door 1 and the right-opening door 1. The mounting plate 10 is formed with screw holes (not shown) for attaching the main unit 11. The main unit 11 is attached to the mounting plate 10 from the main unit 11 side with a total of four screws 13.

[0018] <Main unit 11> The main unit 11 has a rectangular parallelepiped shape that is long in the left-right direction. The main unit 11 includes a drive unit 14 (drive device) that opens and closes the door 1 by driving a drive shaft 20, and a control unit 15 (control device) that controls the drive unit 14. The drive unit 14 and the control unit 15 are attached to the front surface (front face) of the mounting plate 10. The drive unit 14 and the control unit 15 are arranged side by side in the left-right direction. In a right-opening specification, the drive unit 14 is located on the right side as viewed from the front (the hinge side, the door end side), and the control unit 15 is located on the left side as viewed from the front (the anti-hinge side, the door front side).

[0019] <Drive unit 14> The drive unit 14 occupies most of the main unit 11. The drive unit 14 is rectangular and elongated in the left-right direction. The drive unit 14 includes a drive shaft 20 and a motor (not shown) for driving the drive shaft 20. The drive shaft 20 is provided on the right side of the drive unit 14. The motor is located between the drive shaft 20 and the control unit 15. The motor is, for example, a brushless DC motor. Cover mounting holes 21 are provided on the front and back of the drive unit 14. The number and arrangement of the cover mounting holes 21 are arbitrary, but in this embodiment, a pair of cover mounting holes 21 are provided on the front and back, separated from each other in the left-right direction. The front cover mounting holes 21 and the back cover mounting holes 21 are arranged symmetrically to each other. The cover 12 can be attached to either the front or back of the main unit 11.

[0020] <Control Unit 15> The control unit 15 drives and controls the motor. The control unit 15 is located on the left side of the drive unit 14. In other words, the control unit 15 is located on the opposite side to the drive shaft 20. The length of the control unit 15 in the left-right direction is shorter than that of the drive unit 14. The control unit 15 is approximately cubic. The control unit 15 is attached to the drive unit 14. However, the control unit 15 may be attached to the mounting plate 10 instead of the drive unit 14.

[0021] <Cover 12> FIG. 7 shows the overall configuration of the cover 12. The cover 12 covers the main unit 11, which is attached to the front of the mounting plate 10, from its front side (front side). The cover 12 has a front portion, an upper portion, a lower portion, and left and right side portions, and the rear portion is open. The cover 12 forms the remaining five walls of the outer casing of the main body 3 except for the wall on the rear side. The cover 12 covers the front, upper surface, lower surface, and both left and right side surfaces of the main unit 11. The cover 12 includes a main body cover 30, a left side cover 31, and a right side cover 32.

[0022] <Main body cover 30> FIG. 8 shows the body cover 30. The body cover 30 constitutes the front, top, and bottom of the cover 12. A first end and a second end in the left-right direction of the body cover 30 are both open. That is, both the left and right ends of the body cover 30 are open. In this embodiment, the left end of the body cover 30 is the first end, and the right end is the second end. The body cover 30 covers a total of three sides of the main unit 11, which are the front, top, and bottom.

[0023] The main body cover 30 includes a main body cover 33 and a sub-body cover 34. The main body cover 33 and the sub-body cover 34 are detachable from each other. The main body cover 33 is made of resin and melts in the event of a fire. The main body cover 33 is a resin molded product. The sub-body cover 34 is made of metal and does not melt in the event of a fire. The main body cover 33 covers the front and bottom of the main unit 11, and further covers only a part of the front side of the upper surface of the main unit 11 in a strip shape that is slightly long in the left-right direction. The main body cover 33 constitutes the front and bottom parts of the cover 12, and also constitutes a narrow strip-shaped part on the front side of the upper surface of the cover 12. The sub-body cover 34 covers most of the rear side (door side) of the upper surface of the main unit 11. The sub-body cover 34 constitutes a main part that occupies most of the rear side of the upper surface of the cover 12.

[0024] <Main body cover 33> 9 shows the main body cover 33. The main body cover 33 has a main body front piece 40 that faces the front of the main body unit 11, a main body bottom piece 41 that extends from the lower end of the main body front piece 40 toward the rear side and faces the lower surface of the main body unit 11, and a narrow main body strip piece 42 that protrudes from the upper end of the main body front piece 40 toward the rear side. A clamping portion for clamping the sub-main body cover 34 is provided at the rear side end of the main body strip piece 42. The clamping portion clamps the front side end of the sub-main body cover 34 from above and below. The sub-main body cover 34 is inserted into the clamping portion from the rear side toward the front side and is held by frictional resistance between the clamping portion.

[0025] In detail, the clamping portion has an upper support portion 43 that supports the sub-main body cover 34 from above, and a lower support portion 44 that supports the sub-main body cover 34 from below. As shown in FIG. 6, the upper support portion 43 and the lower support portion 44 clamp the sub-main body cover 34 vertically. The size of the upper support portion 43 is preferably smaller than the size of the lower support portion 44, so that the main main body cover 33 can be easily removed from the sub-main body cover 34 in the event of a fire. The configuration, i.e., the shape and arrangement of the upper support portion 43 and the lower support portion 44 are arbitrary, but for example, a plurality of upper support portions 43, specifically three, are provided at intervals in the left-right direction, and more specifically, the upper support portion 43 is semicircular and protrudes from the end portion on the rear side of the main body strip 42 toward the rear side. The lower support portion 44 is provided in an area where the upper support portion 43 is not provided, of the entire left-right length of the main body strip 42. That is, the upper support portions 43 and the lower support portions 44 are provided alternately in the left-right direction. The lower support portion 44 protrudes from the rear end of the main body strip 42 in a flange-like shape toward the rear side, and is in the form of a strip that is long in the left-right direction.

[0026] As shown in Fig. 6, a mating pin 45 is attached to the inner surface of the main body front piece 40 of the main body cover 33. The mating pin 45 may be formed integrally with the main body cover 33 rather than being a separate member. The mating pin 45 is made of resin and is adhesively fixed to the inner surface of the main body front piece 40. The mating pin 45 can be fitted into the cover mounting hole 21 of the main unit 11. The arrangement of the mating pins 45 corresponds to the cover mounting holes 21, and a pair of mating pins are provided spaced apart in the left-right direction.

[0027] The main body cover 33 has locking projections 46 at both left and right ends for locking the left side cover 31 and the right side cover 32. The locking projections 46 are provided on the inner surface of the main body cover 33. The locking projections 46 are provided on the main body bottom piece 41 and the main body front piece 40. Note that the locking projection 46 on the main body front piece 40 is not shown in the figure. The number of locking projections 46 is arbitrary, but in this embodiment, one locking projection is provided on each of the left and right ends of the main body front piece 40, and two locking projections are provided on each of the left and right ends of the main body bottom piece 41.

[0028] <Sub-body cover 34> The state of the sub-body cover 34 alone is shown in Figure 10. The sub-body cover 34 is made of a single thin metal plate and is flat. The sub-body cover 34 has no distinction between the front and back and can be used on both sides. Figure 10 shows a plan view of the sub-body cover 34 that opens from the right. The sub-body cover 34 has a rectangular shape that is long in the left-right direction. Screw through holes 47 are formed at both the left and right ends of the sub-body cover 34. The left side cover 31 and the right side cover 32 are screwed to the sub-body cover 34 via the screw through holes 47.

[0029] The sub-main body cover 34 has a relatively large first notch 48 and a relatively small second notch 49 at one end in the left-right direction, which are cut out and opened on the back side. The drive shaft 20 of the main unit 11 is exposed on the upper side from the first notch 48, and the connector 16 for connecting a cord in the main unit 11 (see FIG. 5) can be exposed on the upper side from the second notch 49. The end of a cord (not shown) is detachably connected to the connector 16 for connecting a cord. The cord is preferably a curled cord. Power is supplied to the main unit 11 through the cord, and a signal from the outside may be sent together with the power. In FIG. 10, the first notch 48 and the second notch 49 are located on the right side, but when the sub-main body cover 34 is turned over from the state shown in FIG. 10, the sub-main body cover 34 becomes a left-opening type, and the first notch 48 and the second notch 49 are located on the left side.

[0030] <Left side cover 31 and right side cover 32> Fig. 11 shows the left side cover 31 alone, and Fig. 12 shows the right side cover 32 alone. The left side cover 31 and the right side cover 32 are bilaterally symmetrical to each other. Both the left side cover 31 and the right side cover 32 are made of resin, are resin molded products, and will melt in the event of a fire.

[0031] The left side cover 31 is removably attached to the left end of the main body cover 30 and closes the left end opening of the main body cover 30. The right side cover 32 is removably attached to the right end of the main body cover 30 and closes the right end opening of the main body cover 30. The left side cover 31 forms the left side surface of the cover 12, and the right side cover 32 forms the right side surface of the cover 12. The left side cover 31 covers the left side surface of the main unit 11, and the right side cover 32 covers the right side surface of the main body unit 11.

[0032] A locking piece 51 having a locking recess 50 (locking portion) is provided on the inner surface of the left side cover 31 so as to protrude inward, i.e., toward the right side. The locking piece 51 is provided in three locations in total: two locations on the lower part and one location on the front part of the left side cover 31. The locking recess 50 may be a through hole.

[0033] A pair of screw bosses 52 are provided on the upper part of the inner surface of the left side cover 31, one at the front and one at the rear. The screw bosses 52 protrude inward, i.e., toward the right side. In other words, when the left side cover 31 is attached to the main body cover 33, the screw bosses 52 protrude toward the main body cover 33. The screw bosses 52 are formed with screw holes 53 along the vertical direction. The screw holes 53 may be pre-formed with female threads, or may be formed with female threads by screwing the screws 17 into them. That is, the screws 17 may be tapping screws. The screw holes 53 correspond to the screw through holes 47 of the sub-body cover 34, and as shown in FIG. 7, the screws 17 are inserted from above through the screw through holes 47 and screwed into the screw holes 53, thereby screwing the left side cover 31 to the sub-body cover 34, i.e., the main body cover 30.

[0034] The right side cover 32 is similar to the left side cover 31, and the three locking projections 46 of the main body cover 33 are locked into the locking recesses 50 of the three locking pieces 51. Then, the screws 17 are inserted from above through the screw through holes 47 and screwed into the screw holes 53, thereby screwing the right side cover 32 to the sub-body cover 34, i.e., the body cover 30. The screws 17 for screwing the left side cover 31 and the right side cover 32 to the body cover 30 may be made of resin, but are preferably made of metal.

[0035] <Assembling the cover 12> Next, the procedure for assembling the cover 12 will be described. However, the following procedure is an example and may be modified in various ways. First, the sub-body cover 34 is clamped by the clamping portion of the main body cover 33. This causes the main body cover 33 and the sub-body cover 34 to be combined, completing the body cover 30.

[0036] The right side cover 32 is attached to the main body cover 30. The locking piece 51 and the screw boss 52 of the right side cover 32 are inserted into the inside of the right end part of the main body cover 30, and the locking recess 50 of the locking piece 51 of the right side cover 32 is locked with the locking protrusion 46 of the main body cover 33. Then, the screw 17 is screwed into the screw boss 52 of the right side cover 32 from above through the screw through hole 47 of the sub-main body cover 34, and the right side cover 32 is screwed to the main body cover 30. By attaching the right side cover 32 to the main body cover 30, the opening at the right end part of the main body cover 30 is closed.

[0037] Similarly, the left side cover 31 is attached to the left end of the main body cover 30. The locking piece 51 and screw boss 52 of the left side cover 31 are inserted into the inside of the left end of the main body cover 30, and the locking recess 50 of the locking piece 51 of the left side cover 31 is locked with the locking protrusion 46 of the main body cover 33. Then, the screw 17 is screwed into the screw boss 52 of the left side cover 31 from above through the screw through hole 47 of the sub-main body cover 34, and the left side cover 31 is screwed to the main body cover 30. By attaching the left side cover 31 to the main body cover 30, the opening at the left end of the main body cover 30 is closed.

[0038] <Installation of cover 12> The cover 12 is attached from the front side to the main unit 11 attached to the mounting plate 10. The cover 12 can be attached to the main unit 11 by fitting the fitting pins 45 of the main body cover 30 into the cover mounting holes 21 of the main unit 11.

[0039] <Change to left-hand opening> The main unit 11 can be easily changed to a left-hand opening type by simply rotating it 180 degrees around the vertical axis from the state shown in FIG. 5, reversing the front and rear, and attaching it to the mounting plate 10.

[0040] The main body cover 30 can be changed to a left-opening type simply by turning the sub-main body cover 34 upside down. The sub-main body cover 34 can be easily changed to a left-opening type cover 12 by simply turning it upside down (front and back) by rotating it 180 degrees around the axis in the front-rear direction.

[0041] As described above, the cover 12 has a resin portion and a metal portion. The resin portion is a melting portion that melts in the event of a fire, and the metal portion is a non-melting portion that does not melt in the event of a fire. In this embodiment, of the cover 12, the sub-main body cover 34 is made of metal and is a non-melting portion, and the other portions, i.e., the main body cover 33, the right side cover 32, and the left side cover 31, are made of resin and are melting portions.

[0042] In the event of a fire occurring when the main body 3 is attached to the door 1, the main body cover 33, the right side cover 32, and the left side cover 31 of the cover 12 melt due to the heat of the fire, come off the main body unit 11, and fall to the floor. On the other hand, the sub-main body cover 34 does not melt and remains on the main body unit 11 as it is. FIG. 13 shows an assumed view of a fire. In this embodiment, the main body cover 33, the right side cover 32, and the left side cover 31 are the falling parts that fall from the main body unit 11 in the event of a fire, and the sub-main body cover 34 is the remaining part that remains on the main body unit 11 in the event of a fire. Note that if the screws 17 for fastening the right side cover 32 and the left side cover 31 are made of metal, the screws also become the remaining parts that remain together with the sub-main body cover 34.

[0043] The main body cover 33, right side cover 32, and left side cover 31, which are made of resin, melt due to heat in the event of a fire, but do not remain on the main unit 11 but fall to the floor, so they are unlikely to become any hotter. In addition, the lower surface of the cover 12 is opened when the main body cover 33 falls. Therefore, even if the resin parts of the main unit 11 melt, they fall to the floor. On the other hand, the sub-main body cover 34 remains on the upper surface of the main unit 11, but is made of metal and does not melt. In this way, the molten parts of the cover 12 fall without remaining on the main unit 11 in the event of a fire, and only the non-molten parts of the cover 12 remain on the main unit 11, ensuring fire resistance.

[0044] Since the right side cover 32 and the left side cover 31 also fall, not only the bottom surface of the cover 12 but also the left and right side surfaces are opened, which makes it possible to further prevent any molten parts from remaining on the main unit 11.

[0045] The sub-main body cover 34 occupies most of the rear side (door side) of the upper surface of the cover 12, and the only molten part of the upper surface of the cover 12 is the thin main body strip piece 42 on the front side, so that it is easy to prevent any molten part from remaining on the upper surface of the main unit 11.

[0046] The right side cover 32 and the left side cover 31 are screwed to the sub-main body cover 34 by screw bosses 52 that protrude toward the sub-main body cover 34. Therefore, the screw bosses 52 will increase in temperature relatively quickly due to the metal sub-main body cover 34. Therefore, in the event of a fire, the right side cover 32 and the left side cover 31 can be easily separated from the sub-main body cover 34 and dropped.

[0047] Since the connection between the main body cover 33 and the sub-body cover 34 is by the clamping portion, the main body cover 33 can easily separate and fall forward from the sub-body cover 34 in the event of a fire. In particular, since the upper support portion 43 is smaller than the lower support portion 44, the upper support portion 43 melts before the lower support portion 44. Therefore, the main body cover 33 can easily separate and fall forward in the event of a fire. Since a plurality of the upper support portions 43 are provided at intervals in the left-right direction, the upper support portions 43 can easily melt. In addition, since the upper support portions 43 are provided in an island or spot shape at one or several points on the entire length of the main body strip 42 in the left-right direction, the upper support portions 43 can easily melt. Note that, instead of or together with the clamping portion, a screw boss 52 may be provided on the main body strip 42 of the main body cover 33 to protrude toward the back side, and the main body cover 33 may be screwed to the sub-body cover 34.

[0048] Meanwhile, the main body cover 33, right side cover 32, and left side cover 31 are the most visible parts of the cover 12, but by making these visible parts out of resin, a good aesthetic look can be easily ensured. Furthermore, since the main body cover 33 is provided with a narrow body strip 42, the metallic sub-body cover 34 is obscured by the body strip 42, further improving the aesthetic look. Also, since the sub-body cover 34 is one step lower than the body strip 42, the sub-body cover 34 is obscured.

[0049] In this embodiment, the left side cover 31 and the right side cover 32 are separate members from the main body cover 33, but the left side cover 31 or the right side cover 32 may be integrally formed with the main body cover 33 as a single member, or the left side cover 31, the right side cover 32 and the main body cover 33 may be integrally formed as a single member.

[0050] In addition, the entire falling part is a molten part, i.e., made of resin, but, for example, only the connecting part between the falling part and the remaining part of the falling part may be made of resin, and the other parts of the falling part may be made of metal. The side part of the cover 12 may remain without falling. The door closer does not have to be electric. [Explanation of symbols]

[0051] 1 Door 2 Door Frame 3. Main unit 4 Arm 5 Links 6 Bracket 10 Mounting plate 11 Main unit 12 Cover 13 Screws 14 Drive unit (drive device) 15 Control Unit 16 Connectors 17 Screws 20 Drive shaft 21 Cover mounting hole 30 Main unit cover 31 Left side cover (drop part) 32 Right side cover (drop part) 33 Main body cover (drop section) 34 Sub-body cover (remaining part) 40 Main body front piece 41 Lower body piece 42 Main body strip 43 Upper support part 44 Lower support part 45 Mating Pin 46 Locking protrusion 47 Screw through hole 48 First notch 49 Second notch 50 Locking recess 51 Locking piece 52 Screw boss 53 Screw hole

Claims

1. A cover having a front portion, an upper portion, and a lower portion, which respectively cover the front, upper surface, and lower surface of a drive mechanism of a door closer that is attached to a door surface and positioned in front of the door surface, a resin drop portion that constitutes a part of the front side of the front portion, the lower portion, and the upper portion and that falls from the drive device in the event of a fire; a metal remaining portion that constitutes a majority of the rear side of the upper surface portion and that remains in the drive device in the event of a fire; A door closer cover in which the upper surface is partitioned into a front side and a rear side by a drop portion and a remaining portion, and the rear side end of the drop portion and the front side end of the remaining portion are connected in the upper surface.

2. The drop section includes a front section, a lower section, and a main body cover that constitutes a part of the front side of the upper section; the remaining portion includes a sub-main body cover that constitutes a large portion of the rear side of the upper surface portion; A door closer cover as described in claim 1, wherein the upper surface portion is partitioned into a front side and a rear side by a main body cover and a sub-body cover, and the rear side end of the main body cover and the front side end of the sub-body cover are connected at the upper surface portion.

3. A cover for a door closer as described in claim 2, wherein the main body cover has a main body strip that constitutes a part of the front side of the upper surface, and an upper support portion and a lower support portion are provided at the rear end of the main body strip to hold the front end of the sub-main body cover above and below.

4. A door closer comprising: a drive unit attached to a door surface and positioned in front of the door surface to drive the door; and a cover having a front portion, an upper portion, and a lower portion that respectively cover the front, upper, and lower surfaces of the drive unit, the cover includes a resin drop portion that constitutes a part of the front side of the front surface portion, the bottom surface portion, and the top surface portion and that falls from the drive device in the event of a fire, and a metal remaining portion that constitutes a majority of the back side of the top surface portion and that remains on the drive device in the event of a fire; A door closer in which the upper surface is partitioned into a front side and a rear side by a drop portion and a remaining portion, and the rear side end of the drop portion and the front side end of the remaining portion are connected at the upper surface.

Images