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JP-7857380-B2 - 360-degree rotatable cam hydraulic door closer for narrow frame doors

JP7857380B2JP 7857380 B2JP7857380 B2JP 7857380B2JP-7857380-B2

Inventors

  • 陳 宗慶

Assignees

  • 松之門控設備股▲分▼有限公司

Dates

Publication Date
20260512
Application Date
20241209
Priority Date
20231211

Claims (6)

  1. A 360-degree rotatable cam hydraulic door closer for narrow-frame doors, The door closer housing comprises a camshaft, a bidirectional piston , a drive spring , an automatic compensation valve assembly, a cylindrical member, and a spring member . Inside the door closer housing, an internal cavity is formed along its axial direction. The camshaft has an axial direction perpendicular to the extension direction of the door closer housing, is supported within the door closer housing so as to be 360 degrees rotatable, and has an eccentric cam installed in the center that is synchronously rotatable. The bidirectional piston is slidably mounted within the internal cavity, and a damping roller is rotatably mounted on the side of the eccentric cam closest to the eccentric cam, The drive spring is housed within the internal cavity and contacts the bidirectional piston and the door closer housing, respectively, and biases the damping roller to always flexibly contact the outer circumferential surface of the eccentric cam. The outer circumferential surface of the eccentric cam is provided with a first arc-shaped recess , a first damping protrusion, a second arc-shaped recess , and a second damping protrusion, wherein the first arc-shaped recess and the second arc-shaped recess are located on the same horizontal line, and the first damping protrusion and the second damping protrusion are located on the same vertical line. The automatic compensation valve assembly is slidably installed within the lumen and is located on the opposite side of the drive spring of the eccentric cam, The internal body is partitioned by the automatic compensating valve assembly and the bidirectional piston, and a first oil passage is formed on the side of the automatic compensating valve assembly opposite the eccentric cam, a second oil passage is formed on the drive spring side of the bidirectional piston, and a third oil passage is formed between the automatic compensating valve assembly and the bidirectional piston, and the first, second, and third oil passages are all filled with hydraulic fluid, and the hydraulic fluid in the second and third oil passages is in communication with the bidirectional piston. The automatic compensation valve assembly is configured such that when the pressure in the first oil passage exceeds a predetermined threshold, the automatic compensation valve assembly allows the flow of hydraulic fluid between the first oil passage and the third oil passage. The aforementioned automatic compensating valve assembly comprises a valve piston, a valve body, a valve core member, and a core spring. The valve piston is slidably mounted within the lumen, The valve body is mounted inside the valve piston, and valve passages are provided through it that communicate with the first oil passage and the third oil passage, respectively. The valve core member is movably provided within the valve passage and is used to open or close the valve passage. The core spring is housed within the valve passage, with one end connected to the valve body and the other end connected to the valve core member, and biases the valve core member to block the valve passage. The cylindrical member is installed inside the valve piston, the valve body is installed inside the cylindrical member, one end of the cylindrical member abuts against the camshaft, the other end of the cylindrical member abuts against the spring member, one end of the spring member abuts against the cylindrical member, and the other end of the spring member abuts against the door closer housing. A 360-degree rotatable cam-type hydraulic door closer for narrow-frame doors, characterized by the following features.
  2. A 360-degree rotatable cam hydraulic door closer for a narrow-frame door according to claim 1, The aforementioned bidirectional piston is provided with a fixing pin on the side closer to the eccentric cam. A 360-degree rotatable cam hydraulic door closer for narrow-frame doors, characterized in that the damping roller is rotatably attached to the fixing pin.
  3. A 360-degree rotatable cam hydraulic door closer for a narrow-frame door according to claim 1, A 360-degree rotatable cam hydraulic door closer for narrow-frame doors, characterized in that the drive spring comprises an inner spring and an outer spring, the outer spring is fitted over the outside of the inner spring, one end of the outer spring and the inner spring simultaneously contacts the door closer housing, and the other end of the outer spring and the inner spring simultaneously contacts the bidirectional piston.
  4. A 360-degree rotatable cam hydraulic door closer for a narrow-frame door according to claim 1, A 360-degree rotatable cam hydraulic door closer for narrow-frame doors, characterized in that the door closer housing has a first bearing cylinder installed at a position corresponding to one end of the camshaft, a position limiting mounting seat installed at a position corresponding to the other end of the camshaft, a second bearing cylinder installed on the limiting mounting seat, the midpoints of the first bearing cylinder and the second bearing cylinder are located on the same axis, and the camshaft is provided passing through the first bearing cylinder and the second bearing cylinder.
  5. A 360-degree rotatable cam hydraulic door closer for a narrow-frame door according to claim 4, A 360-degree rotatable cam hydraulic door closer for narrow-frame doors, characterized in that an outer peripheral sealing ring is installed between the outer end face of the position limiting mounting base and the door closer housing, and an inner peripheral sealing ring is installed between the inner end face of the position limiting mounting base and the camshaft.
  6. A 360-degree rotatable cam hydraulic door closer for a narrow-frame door according to claim 1, The door closer housing comprises a housing body and a sealed end cover. The housing body is hollow inside, open on both sides, and the camshaft is rotatably connected to the housing body. A 360-degree rotatable cam hydraulic door closer for narrow-frame doors, characterized in that the sealing end covers consist of two parts, each installed in an opening on both sides of the housing body, and by enclosing each other, form the inner cavity, and an end cover sealing ring is installed between the outer end surface of the sealing end cover and the housing body.

Description

This invention relates to the technical field of door closers, and more particularly to a 360-degree rotatable cam hydraulic door closer for narrow-frame doors. A door closer is a spring-like hydraulic device located at the top of a door. After the door is opened, it compresses and releases, automatically closing the door. It functions similarly to a spring-loaded door, ensuring that the door closes accurately and promptly to its initial position after being opened. In a door closer, during the spring release process, the hydraulic fluid in the left chamber is compressed, closing a check valve. The hydraulic fluid then flows out through the gap between the door closer housing and the plunger, and recirculates into the right chamber through two passages: a small hole in the plunger and a throttle valve core. Therefore, the hydraulic fluid acts as resistance to the spring release, creating a cushioning effect through throttling, and controlling the door's closing speed. Most standard door closers only allow doors to open up to 90 degrees. A few allow doors to open up to 180 degrees. Therefore, the aforementioned door closers cannot be used when doors need to open more than 180 degrees, resulting in a narrow range of application and limited use, as they cannot be applied to doors with entry/exit from both sides. This is a schematic diagram 1 showing the internal structure of a 360-degree rotatable cam hydraulic door closer for narrow-frame doors according to an embodiment of the present invention.This is a schematic diagram 2 showing the internal structure of a 360-degree rotatable cam hydraulic door closer for narrow-frame doors according to an embodiment of the present invention.This is a schematic diagram showing the structure of an eccentric cam according to an embodiment of the present invention.This is a schematic diagram showing the structure of a door closer housing according to an embodiment of the present invention.This is a schematic diagram showing the structure of an automatic compensating valve assembly according to an embodiment of the present invention. Embodiments of the present invention are described in detail below. Exemplary embodiments are shown in the drawings. Here, identical or similar reference numerals represent identical or similar elements or elements having identical or similar functions. The embodiments described below with reference to the drawings are illustrative for illustrating embodiments of the invention and should not be construed as limitations on the invention. In the description of embodiments of the present invention, directions or positional relationships indicated by terms such as "length," "width," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are directions or positional relationships shown based on the drawings. These are for the purpose of describing embodiments of the present invention and simplifying the explanation, and do not indicate or imply that the device or component has a specific orientation, or needs to be constructed and operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms “first” and “second” are used for descriptive purposes and should not be interpreted as indicating or implying relative importance or the number of technical features. Therefore, features defined as “first” and “second” explicitly or implicitly include one or more features. In the description of embodiments of the present invention, “multiple” means two or more unless specifically limited. In embodiments of the present invention, terms such as “attachment,” “connection,” “connection,” and “fixed” should be understood broadly unless otherwise explicitly defined. For example, a fixed connection may be a removable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection via an intermediate medium; it may be internal communication between two members or an interaction between two members. Those skilled in the art will be able to understand the specific meaning of these terms in embodiments of the present invention based on the specific circumstances. (First Embodiment) In the first embodiment of the present invention, as shown in Figures 1 to 3, a 360-degree rotatable cam hydraulic door closer for narrow-frame doors comprises a door closer housing 100, a camshaft 200, a bidirectional piston 300, and a drive spring 400. Inside the door closer housing 100, an internal cavity 110 is formed along its axial direction. The camshaft 200 has its axial direction perpendicular to the extension direction of the door closer housing 100, is supported within the door closer housing 100 so as to be 360 degrees rotatable, and has a synchronously rotatable eccentric cam 210 installed in the center. The bidirectional piston 300 is slidably mounted w