Cam hydraulic door closer for narrow frame door

Abstract

To provide, in particular, a cam hydraulic door closer for narrow frame doors relating to a technical field of a door closer.SOLUTION: The cam hydraulic door closer for narrow frame doors is built-in designed, including a door closer body, a horizontal fixing member, and a vertical fixing member fixed inside a door body by embedding. While the door closer body is fixed so that its position in the horizontal direction is regulated by the horizontal fixing member, it is fixed so that its position in the vertical direction is regulated by the vertical fixing member. As a result, the outer surfaces of the door closer body, the horizontal fixing member, and the vertical fixing member are flush with the door body, so that it does not take up extra space, does not spoil the aesthetics of the door, and the door closer body is not exposed and is not easily damaged, which ensures the usage performance and extends the life of this cam hydraulic door closer for narrow frame doors.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of door closers, and particularly to a cam hydraulic door closer for a narrow-edge door.

Background Art

[0002] A door closer is a hydraulic device such as a spring provided at the upper part of a door. After the door is opened, it is compressed and released to automatically close the door, having the same function as a spring door. After the door is opened, it is ensured that the door can be accurately and timely closed to the initial position. During the process of the spring being released, the hydraulic oil in the left chamber of the door closer is compressed and the check valve is closed. The hydraulic oil flows out through the gap between the door closer housing and the plunger, and returns to the right chamber through two flow paths provided with small holes in the plunger and the throttle valve core. Therefore, the hydraulic oil becomes the resistance for the spring to be released, and the cushioning effect by throttling is obtained, and the closing speed of the door is controlled.

[0003] Currently, commercially available door closers are installed between the door and the door frame, and most of them are installed at the upper part of the door. This requires ensuring a space for installing the door closer when installing the door body. In addition, the door closer exposed to the outside is easily damaged by impacts, presses, and other damages, and the usability is impaired.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The object of the present invention is to provide a cam hydraulic door closer for a narrow-edge door, which is attached to the upper end of the door, solves the technical problem of the conventional door closer that requires ensuring an installation space and is easily damaged.

Means for Solving the Problems

[0005] In order to achieve the above object, a cam hydraulic door closer for a narrow-edge door according to an embodiment of the present invention is used for connecting a door body and a door frame, and includes a door closer body, a horizontal fixing member, a vertical fixing member, and an eccentric camshaft. The door closer body is embedded in a corner of the door body and is flush with the door body. One end of the horizontal fixing member is fixed to be flush with the upper surface of the door closer body, and the other end extends in the horizontal direction and is fixed to be flush with the horizontal side of the door body. One end of the vertical fixing member is fixed to be flush with the bottom surface of the door closer body, and the other end extends in the vertical direction and is flush with the left end surface of the door closer body and at the same time is fixed to be flush with the vertical side of the door body. The axial direction of the eccentric camshaft is perpendicular to the extending direction of the door closer body. One end is fixed and connected to the door frame, and the other end is rotatably connected to the inside of the door closer body.

[0006] Preferably, the horizontal fixing member is installed in a straight shape and includes a first door closer connection board and a first door body connection board which are integrally formed. The first door closer connection board is fixed to be flush with the upper surface of the door closer body by a plurality of fixing screws, and the first door body connection board is fixed to be flush with the horizontal side of the door body by a plurality of fixing screws.

[0007] Preferably, the vertical fixing member is installed in an L shape and includes a second door closer connection board and a second door body connection board which are integrally formed. The second door closer connection board is installed horizontally and is fixed to be flush with the bottom surface of the door closer body by a plurality of fixing screws. The second door body connection board is installed vertically, flush with the left end face of the door closer body, and is fixed by a plurality of fixing screws to be flush with the vertical side of the door body.

[0008] Preferably, the door closer body includes a door closer housing, an automatic compensation valve assembly, a damping compression assembly, and a driving spring member. The door closer housing is provided with an inner cavity filled with hydraulic oil along its axial direction inside the door closer housing, and the eccentric camshaft is rotatably supported in the door closer housing. The automatic compensation valve assembly is slidably provided in the inner cavity and is located on the left side of the eccentric camshaft. The damping compression assembly is slidably provided in the inner cavity and is located on the right side of the eccentric camshaft. The driving spring member is accommodated in the inner cavity, abuts against the damping compression assembly and the door closer housing respectively, and biases the damping compression assembly to softly abut against the outer peripheral surface of the eccentric camshaft.

[0009] Preferably, the inner cavity is partitioned by the automatic compensation valve assembly and the damping compression assembly, and a first oil passage located on the left side of the automatic compensation valve assembly, a second oil passage located on the right side of the damping compression assembly, and a third oil passage located between the automatic compensation valve assembly and the damping compression assembly are formed, and the second oil passage and the third oil passage are in communication. When the pressure in the first oil passage exceeds a predetermined threshold value, the automatic compensation valve assembly is configured to allow the flow of hydraulic oil between the first oil passage and the third oil passage.

[0010] Preferably, the automatic compensation valve assembly includes a valve piston, a valve body, a valve core member, and a core spring. The valve piston is slidably provided in the inner cavity body. The valve body is mounted in the valve piston, and a valve flow path communicating with the first oil path and the third oil path is provided therethrough. The valve core member is movably provided in the valve flow path and is used to realize the opening or blocking of the valve flow path. The core spring is accommodated in the valve flow path, one end is connected to the valve body, the other end is connected to the valve core member, and the valve core member is urged to block the valve flow path.

[0011] Preferably, the damping compression assembly includes a compression piston, a fixed pin, and a damping roller. The compression piston is slidably provided in the inner cavity body such that the driving spring member abuts against the compression piston and the door closer housing respectively, and piston flow paths communicating with the second oil path and the third oil path are provided therethrough. The fixed pin is fixed to an end of the compression piston close to the eccentric camshaft. The damping roller is rotatably provided on the fixed pin and softly abuts against the outer peripheral surface of the eccentric camshaft.

[0012] Preferably, the driving spring member includes an inner spring and an outer spring. The outer spring covers the outside of the inner spring. One end of the outer spring and the inner spring abuts against the door closer housing simultaneously, and the other end of the outer spring and the inner spring abuts against the damping compression assembly simultaneously.

[0013] One or more of the above-described means of the cam hydraulic door closer for a narrow-edge door according to the present invention have at least one of the following technical effects. This cam hydraulic door closer for a narrow-edge door has an embedded design, and the door closer body, the horizontal fixing member, and the vertical fixing member are fixed inside the door body by an embedded mounting method. The door closer body is fixed so that its position in the horizontal direction is restricted by the horizontal fixing member on the one hand, and its position in the vertical direction is restricted by the vertical fixing member on the other hand. As a result, the outer surfaces of the door closer body, the horizontal fixing member, and the vertical fixing member are flush with the door body, without taking up extra space and without damaging the aesthetics of the door. Since the door closer body is not exposed and is less likely to be damaged, the use performance of this cam hydraulic door closer for a narrow-edge door can be guaranteed and its lifespan can be extended.

[0014] To more clearly explain the technical aspects in the embodiments of the present invention, the drawings required in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings from these drawings without creative efforts.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0016] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings. Here, the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary for explaining the embodiments of the invention and should not be construed as limitations on the present invention.

[0017] In the description of the embodiments of the present invention, the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship shown based on the drawings, and is for the purpose of explaining the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or member needs to have a specific orientation, be constructed in a specific orientation, and operate, so it should not be construed as a limitation on the present invention.

[0018] Furthermore, the terms "first" and "second" are used for the purpose of description and should not be construed as indicating relative importance or implying the number of technical features. Therefore, the features defined as "first" and "second" explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically and clearly limited.

[0019] In the embodiments of the present invention, terms such as "attachment", "connected to each other", "connection", "fixation", etc. should be understood broadly unless specifically defined. For example, it may be fixedly connected, a removable connection, integrated, a mechanical connection or an electrical connection, a direct connection or an indirect connection via an intermediate medium, or a communication inside two members or an interaction between two members. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific situation.

[0020] (First Embodiment) In the first embodiment of the present invention, as shown in FIGS. 1 to 3, the cam hydraulic door closer for a narrow door frame is used for connecting the door body and the door frame, and includes a door closer body 100, a horizontal fixing member 200, a vertical fixing member 300, and an eccentric camshaft 400.

[0021] The door closer body 100 is embedded in a corner of the door body and is flush with the door body.

[0022] One end of the horizontal fixing member 200 is fixed to be flush with the upper surface of the door closer body 100, and the other end extends in the horizontal direction and is fixed to be flush with the horizontal side of the door body.

[0023] One end of the vertical fixing member 300 is fixed to be flush with the bottom surface of the door closer body 100, and the other end extends in the vertical direction and is flush with the left end surface of the door closer body 100 and at the same time is fixed to be flush with the vertical side of the door body.

[0024] The axial direction of the eccentric camshaft 400 is perpendicular to the extension direction of the door closer body 100. One end is fixed and connected to the door frame, and the other end is rotatably connected to the inside of the door closer body 100.

[0025] Specifically, in this embodiment, this cam hydraulic door closer for a narrow-edge door has an embedded design. The door closer body 100, the horizontal fixing member 200, and the vertical fixing member 300 are fixed inside the door body by an embedded mounting method. On the one hand, the horizontal fixing member 200 restricts and fixes the position of the door closer body 100 in the horizontal direction. On the other hand, the vertical fixing member 300 restricts and fixes the position of the door closer body 100 in the vertical direction. As a result, the outer surfaces of the door closer body 100, the horizontal fixing member 200, and the vertical fixing member 300 are flush with the door body, without taking up extra space and without damaging the aesthetics of the door. Since the door closer body is not exposed and is not easily damaged, the use performance of this cam hydraulic door closer for a narrow-edge door can be guaranteed and its lifespan can be extended.

[0026] (Second Embodiment) In the second embodiment of the present invention, as shown in FIG. 1, the horizontal fixing member 200 is installed in a straight shape and includes a first door closer connection board 210 and a first door body connection board 220 that are integrally formed. The first door closer connection board 210 is fixed to be flush with the upper surface of the door closer body 100 by a plurality of fixing screws. The first door body connection board 220 is fixed to be flush with the horizontal side of the door body by a plurality of fixing screws.

[0027] Specifically, in this embodiment, since the first door closer connection board 210 and the first door body connection board 220 are integrally formed, the overall structural strength of the horizontal fixing member 200 can be enhanced. In subsequent use, it has safety and reliability and can meet the need to firmly attach the door closer body 100 and the door body in the horizontal direction.

[0028] Other parts of this embodiment are the same as those of the first embodiment. For features not described in this embodiment, the interpretation of the first embodiment is applied and the description is omitted here.

[0029] (Third Embodiment) In the third embodiment of the present invention, as shown in FIG. 1, the vertical fixing member 300 is installed in an L shape and includes a second door closer connection board 310 and a second door body connection board 320 that are integrally formed. The second door closer connection board 310 is installed horizontally and is fixed by a plurality of fixing screws so as to be flush with the bottom surface of the door closer body 100. The second door body connection board 320 is installed vertically and is flush with the left end surface of the door closer body 100. Further, the second door body connection board 320 is fixed by a plurality of fixing screws so as to be flush with the vertical side of the door body.

[0030] Specifically, in this embodiment, since the second door closer connection board 310 and the second door body connection board 320 are integrally formed, the overall structural strength of the vertical fixing member 300 can be enhanced, and in subsequent use, it has safety and reliability and can meet the need to firmly attach the door closer body 100 and the door body horizontally aligned.

[0031] Other parts of this embodiment are the same as those of the first embodiment. For features not described in this embodiment, the interpretation of the first embodiment is applied and the description is omitted here.

[0032] (Fourth Embodiment) In the fourth embodiment of the present invention, as shown in FIG. 1, the door closer body 100 includes a door closer housing 110, an automatic compensation valve assembly 120, a damping compression assembly 130, and a driving spring member 140. Inside the door closer housing 110, a cavity 111 filled with hydraulic oil along its axial direction is provided. The eccentric camshaft 400 is rotatably supported in the door closer housing 110. The automatic compensation valve assembly 120 is slidably provided in the cavity 111 and is located on the left side of the eccentric camshaft 400. The damping compression assembly 130 is slidably provided in the cavity 111 and is located on the right side of the eccentric camshaft 400. The driving spring member 140 is housed in the cavity 111 and abuts against the damping compression assembly 130 and the door closer housing 110 respectively. The driving spring member 140 biases the damping compression assembly 130 to softly abut against the outer peripheral surface of the eccentric camshaft 400.

[0033] Specifically, in this embodiment, when the door closer body 100 operates, the damping compression assembly 130 always softly abuts against the outer peripheral surface of the eccentric camshaft 400 via the driving spring member 140. When the eccentric camshaft 400 rotates, the damping compression assembly 130 is interlocked, the driving spring member 140 is compressed, and the force of the driving spring member 140 is stored. At the same time, the hydraulic oil flows through the automatic compensation valve assembly 120. Therefore, during rotation, the eccentric camshaft 400 receives the damping action of the damping compression assembly 130 on the eccentric camshaft 400 and the damping action of the hydraulic oil. Thereby, the speed at the moment of closing the door is reduced, and sufficient buffering can be realized.

[0034] Other parts of this embodiment are the same as those of the first embodiment. For the features not described in this embodiment, the interpretation of the first embodiment is applied, and the description is omitted here.

[0035] (Fifth Embodiment) In the fifth embodiment of the present invention, as shown in FIG. 1, the inner cavity 111 is partitioned by an automatic compensation valve assembly 120 and a damping compression assembly 130, and a first oil passage 150 located on the left side of the automatic compensation valve assembly 120, a second oil passage 160 located on the right side of the damping compression assembly 130, and a third oil passage 170 located between the automatic compensation valve assembly 120 and the damping compression assembly 130 are formed. The second oil passage 160 and the third oil passage 170 are in communication. The automatic compensation valve assembly 120 is configured to allow the flow of hydraulic oil between the first oil passage 150 and the third oil passage 170 when the pressure in the first oil passage 150 exceeds a predetermined threshold value.

[0036] Specifically, in this embodiment, hydraulic oil is present in all of the first oil passage 150, the second oil passage 160, and the third oil passage 170. As the door closer housing 110 rotates with the rotation of the door body, the position of the damping compression assembly 130 in the eccentric camshaft 400 changes. As a result, the volume of the second oil passage 160 changes, the hydraulic oil in the second oil passage 160 and the third oil passage 170 flows, a pressure difference is generated between the first oil passage 150 and the third oil passage 170, and the state of the automatic compensation valve assembly 120 changes. Therefore, hydraulic oil flows between the first oil passage 150 and the third oil passage 170, and the balance of the pressure difference between the first oil passage 150 and the third oil passage 170 is maintained. That is, the flow of hydraulic oil in the first oil passage 150, the second oil passage 160, and the third oil passage 170 can be adjusted according to the movement of the door body.

[0037] Other parts of this embodiment are the same as those of the fourth embodiment. For features not described in this embodiment, the interpretation of the fourth embodiment is applied, and the description is omitted here.

[0038] (Sixth Embodiment) In the sixth embodiment of the present invention, as shown in FIG. 4, the automatic compensation valve assembly 120 includes a valve piston 121, a valve body 122, a valve core member 123, and a core spring 124. The valve piston 121 is slidably provided in the inner cavity 111. The valve body 122 is mounted in the valve piston 121, and a valve flow path 1221 communicating with the first oil path 150 and the third oil path 170 is provided therethrough. The valve core member 123 is movably provided in the valve flow path 1221 and is used to realize the opening or blocking of the valve flow path 1221. The core spring 124 is accommodated in the valve flow path 1221. One end of the core spring 124 is connected to the valve body 122. The other end of the core spring 124 is connected to the valve core member 123 and biases the valve core member 123 to block the valve flow path 1221.

[0039] Specifically, in this embodiment, the movement of the valve core member 123 realizes the opening or blocking of the valve flow path 1221. The installation of the core spring 124 ensures the accuracy of the movement of the valve core member 123. When a pressure difference occurs between the first oil path 150 and the third oil path 170, the valve core member 123 pushed by the hydraulic pressure moves in the valve flow path 1221 while overcoming the elastic force of the core spring 124, and opens the valve flow path 1221. When the pressure difference between the first oil path 150 and the third oil path 170 is balanced, the valve core member 123 is pushed by the elastic force of the core spring 124, moves in the valve flow path 1221, returns to its original position, and blocks the valve flow path 1221. The state of the automatic compensation valve assembly 120 changes automatically and has high reliability.

[0040] Other parts of this embodiment are the same as those of the fifth embodiment. For the features not described in this embodiment, the interpretation of the fifth embodiment shall apply, and the description thereof is omitted here.

[0041] (Seventh Embodiment) In the seventh embodiment of the present invention, as shown in FIG. 5, the damping compression assembly 130 includes a compression piston 131, a fixed pin 132, and a damping roller 133. The compression piston 131 is slidably provided in the inner cavity 111. The driving spring member 140 abuts against the compression piston 131 and the door closer housing 110 respectively. A piston flow path 1311 communicating with the second oil path 160 and the third oil path 170 respectively is provided through the compression piston 131. The fixed pin 132 is fixed to an end of the compression piston 131 close to the eccentric camshaft 400. The damping roller 133 is rotatably provided on the fixed pin 132 and softly abuts against the outer peripheral surface of the eccentric camshaft 400.

[0042] Specifically, in this embodiment, the compression piston 131 and the inner wall of the inner cavity 111 slide in unison, and the guide configuration for axially aligning the compression piston 131 is reduced. During use, the compression piston 131 is pushed by the driving spring member 140 and moves. The compression piston 131 moves in the longitudinal direction of the door closer housing 110 by the guiding function of the inner cavity 111. Therefore, the damping roller 133 accurately abuts against the eccentric camshaft 400, enhancing the reliability of operation.

[0043] Other parts of this embodiment are the same as those of the fifth embodiment. For features not described in this embodiment, the interpretation of the fifth embodiment is applied, and the description is omitted here.

[0044] (Eighth Embodiment) In the eighth embodiment of the present invention, as shown in FIG. 1, the driving spring member 140 includes an inner spring 141 and an outer spring 142. The outer spring 142 is sleeved outside the inner spring 141. One ends of the outer spring 142 and the inner spring 141 simultaneously abut against the door closer housing 110, and the other ends of the outer spring 142 and the inner spring 141 simultaneously abut against the damping compression assembly 130.

[0045] Specifically, in this embodiment, the drive spring member 140 has a simple structure and a reasonable design. When the drive spring member 140 receives a force and expands or contracts, both the inner spring 141 and the outer spring 142 expand or contract accordingly and do not interfere with each other. Therefore, when the inner spring 141 and the outer spring 142 are used in combination, deformation is less likely to occur, and the service life of the inner spring 141 and the outer spring 142 can be effectively increased. Due to the composite design, the elasticity of the drive spring member 140 is significantly improved, and the verticality and stability of the spring force are ensured. In addition, it can effectively prevent the inner spring 141 and the outer spring 142 from being damaged due to excessive load.

[0046] Other parts of this embodiment are the same as those of the fourth embodiment. For features not described in this embodiment, the interpretation of the fourth embodiment shall apply, and the description thereof is omitted here.

[0047] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle scope of the present invention shall all be included within the protection scope of the present invention.

Explanation of Reference Numerals

[0048] 100 Door closer body 110 Door closer housing 111 Inner cavity 120 Automatic compensation valve assembly 121 Valve piston 122 Valve body 1221 Valve flow path 123 Valve core member 124 Core spring 130 Damping compression assembly 131 Compression piston 1311 Piston flow path 132 Fixed pin 133 Damping roller 140 Drive spring member 141 Inner spring 142 Outer spring 150 First oil passage 160 Second oil passage 170 Third oil passage 200 Horizontal fixing member 210 First door closer connection board 220 First door body connection board 300 Vertical fixing member 310 Second door closer connection board 320 Second door body connection board 400 Eccentric camshaft

Claims

1. A cam hydraulic door closer for narrow frame doors used to connect a door body and a door frame, The door closer includes a door closer body, a horizontal fixing member, a vertical fixing member, and an eccentric camshaft. The door closer body is embedded in a corner of the door body and is flush with the door body, The horizontal fixing member has one end fixed to be flush with the upper surface of the door closer body, and the other end extends horizontally and is fixed to be flush with the horizontal side of the door body, The vertical fixing member has one end fixed to be flush with the bottom surface of the door closer body, and the other end extends vertically and is flush with the left end surface of the door closer body and is also fixed to be flush with the vertical side of the door body, The eccentric camshaft has an axial direction perpendicular to an extension direction of the door closer body, one end of which is fixed and connected to the door frame, and the other end of which is rotatably connected to the inside of the door closer body. This cam hydraulic door closer for narrow frame doors is characterized by:

2. 2. The cam hydraulic door closer for narrow frame doors according to claim 1, The horizontal fixing member is installed in the shape of a letter and includes a first door closer connection board and a first door body connection board which are integrally formed, the first door closer connection board is fixed to be flush with the upper surface of the door closer body by a plurality of fixing screws, and the first door body connection board is fixed to be flush with the horizontal side of the door body by a plurality of fixing screws. This cam hydraulic door closer for narrow frame doors is characterized by:

3. 2. The cam hydraulic door closer for narrow frame doors according to claim 1, The vertical fixing member is installed in an L-shape and includes a second door closer connection board and a second door body connection board which are integrally formed; The second door closer connection board is installed horizontally and fixed flush with the bottom surface of the door closer body by a plurality of fixing screws; The second door body connection board is installed vertically, flush with the left end surface of the door closer body, and fixed to the vertical side of the door body by a plurality of fixing screws. This cam hydraulic door closer for narrow frame doors is characterized by:

4. 2. The cam hydraulic door closer for narrow frame doors according to claim 1, The door closer body includes a door closer housing, an automatic compensation valve assembly, a damping compression assembly, and a drive spring member; The door closer housing has an inner cavity filled with hydraulic oil along its axial direction, and the eccentric camshaft is rotatably supported in the door closer housing. the automatic compensating valve assembly is slidably mounted within the bore body and is located to the left of the eccentric camshaft; the damped compression assembly is slidably disposed within the body and is located to the right of the eccentric camshaft; The drive spring member is housed in the inner cavity and abuts against the damping compression assembly and the door closer housing, respectively, and biases the damping compression assembly so as to flexibly abut against the outer circumferential surface of the eccentric camshaft. This cam hydraulic door closer for narrow frame doors is characterized by:

5. The cam hydraulic door closer for narrow frame doors according to claim 4, The bore body is partitioned into the automatic compensating valve assembly and the damping compression assembly, and a first oil passage located on the left side of the automatic compensating valve assembly, a second oil passage located on the right side of the damping compression assembly, and a third oil passage located between the automatic compensating valve assembly and the damping compression assembly are formed in the bore body, and the second oil passage and the third oil passage are communicated with each other; The automatic compensating valve assembly is configured such that when pressure in the first oil passage exceeds a predetermined threshold, the automatic compensating valve assembly allows hydraulic fluid flow between the first oil passage and the third oil passage. This cam hydraulic door closer for narrow frame doors is characterized by:

6. 6. The cam hydraulic door closer for narrow frame doors according to claim 5, The self-compensating valve assembly includes a valve piston, a valve body, a valve core member, and a core spring; The valve piston is slidably disposed within the bore body, the valve body is attached in the valve piston, and has valve flow passages extending therethrough, the valve flow passages communicating with the first oil passage and the third oil passage, respectively; The valve core member is movably disposed in the valve flow passage and is used to open or close the valve flow passage; The core spring is housed in the valve flow passage, has one end connected to the valve body, and the other end connected to the valve core member, and biases the valve core member to close the valve flow passage. This cam hydraulic door closer for narrow frame doors is characterized by:

7. 6. The cam hydraulic door closer for narrow frame doors according to claim 5, the damped compression assembly includes a compression piston, a fixed pin, and a damping roller; The compression piston is slidably provided in the inner cavity body so that the drive spring member abuts against the compression piston and the door closer housing, respectively, and a piston flow passage is provided through the inner cavity body, the piston flow passage communicating with the second oil passage and the third oil passage, respectively; the fixed pin is fixed to an end of the compression piston close to the eccentric camshaft, The damping roller is rotatably mounted on the fixed pin and flexibly abuts against the outer circumferential surface of the eccentric camshaft. This cam hydraulic door closer for narrow frame doors is characterized by:

8. The cam hydraulic door closer for narrow frame doors according to claim 4, The drive spring member includes an inner spring and an outer spring, the outer spring is placed on the outside of the inner spring, one ends of the outer spring and the inner spring simultaneously abut against the door closer housing, and the other ends of the outer spring and the inner spring simultaneously abut against the damping compression assembly. This cam hydraulic door closer for narrow frame doors is characterized by:

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