TW201329332A - Piston for a door closing device - Google Patents

Abstract

The invention relates to a piston (10) for a door closing device, comprising a cavity (20) surrounded by an enclosure (30), and having at least one opening (32), wherein a pressure relief valve (40) is movably arranged between at least two positions inside the opening (32), characterized in that the valve (40) is provided with valve means (42) and a surrounding housing (44) having sealing means (46) for sealing the opening (32) in a first position of the valve (40). A holding device (50) is arranged on the enclosure (30) for fixing the second position of the valve (40).

Description

Piston for door closer

The present invention relates to a piston for a door closer, and a pressure relief valve and a method of damping a door closer piston.

In the prior art, the door closer and the piston for the door closer are well known. The piston typically includes an internal cavity surrounded by an outer casing. The inner cavity is used for damping in that it receives the oil body from the outside when the piston moves in a first direction. If the piston moves in the second direction, the oil body is discharged out of the inner cavity, thereby generating damping of the piston movement. Conventional pistons use a pressure relief valve located in an opening and movable between at least two positions. One of the positions of the pressure relief valve is for the oil body to flow into the interior of the casing, and the other position is for the oil body to flow in the opposite direction. Thus, the valve is movable between two positions, and the pressure relief valve opens in a first position against a spring force. In the second position, the spring force is ineffective and the oil body can flow through the valve body.

One of the disadvantages of conventional pistons for door closers is that they require very strict manufacturing tolerances. A conventional piston includes a pressure relief valve that is surrounded by a sleeve. The sleeve must be pressed into the opening of the piston housing in a press fit. The press fit itself requires tight tolerances in the manufacture of the piston housing. In addition, this press fit is highly likely to change due to the high temperatures of the subsequent steps in the manufacturing process. In particular, in terms of housing geometry, and in terms of housing geometry, it can vary due to different thermal conditions. Thus, there is a risk of failure of the press fit, and the sleeve does not have the seat force that securely sits inside the opening of the housing. In addition, the use of a sleeve and a pressure relief valve increases the complexity of the overall system and increases the number of parts, thereby increasing the manufacturing cost of the piston.

It is an object of the present invention to at least partially solve the above problems. In particular, the invention The object is to propose a piston for a door closer, a pressure relief valve and a method of damping a door closer piston, wherein the tolerances for manufacturing the parts can be kept low.

The foregoing object is damped by a piston having the first feature of the patent application scope, and by a pressure relief valve having the features of the independent patent application claim 12, and one of the features of the third application of the independent patent application. The method of the piston is achieved. Other features and details of the invention are set forth in the dependent claims, the description and the drawings. The description of the features and details of the piston for a door closer also applies to the method of the present invention and the pressure relief valve of the present invention.

The piston for a door closer of the present invention includes a cavity having a surrounding outer casing and at least one opening, and the pressure relief valve is located within the opening for movement between at least two positions. The two positions are defined as a first position and a second position. Thus, in the first position, the pressure relief valve is opened to overcome the sealing force of the pressure relief valve. In the second position, the pressure relief valve opens a bypass, such as a surrounding hole around the valve body, allowing liquid, particularly oil, to flow along the valve body of the pressure relief valve. The piston of the present invention is characterized in that the valve has a valve means and a surrounding casing, the casing having a sealing means for sealing the opening in the first position of the valve. In addition, a retainer is provided in the outer casing defining the second position of the valve. By using the retainer, the sleeve that positions the pressure relief valve within the opening can be eliminated. This sleeve is no longer used in the present invention. At the same time, the geometry can be maintained at a low tolerance that is easily achieved because no press fit is used in the piston of the present invention. The pressure relief valve itself includes conventional valve devices. For example, the valve device comprises a spring element and a valve element, the valve element being pressed into the valve seat by the spring element. To open the valve assembly, the force of the spring element must be overcome by a fluid pressure to push the valve element to a position that does not conflict with the flow of the oil body.

The piston of the present invention can be manufactured inexpensively and easily. Since no additional and complicated parts such as sleeves are required and no press fit is required, the valve can be inserted into the opening without any temperature difference. In addition, in the subsequent manufacturing process, even if there is a terminal error, it does not affect the pressure relief. The function of the valve.

In the present invention the retainer defines a second position that is particularly spaced from the first position. The two positions define a path of travel along which the entire pressure relief valve can move. The valve includes a sealing device that is held in its position, for example by the valve head itself. When moving between the two positions, the valve head and the sealing device can serve as a contact area, contact the retainer and/or the inner wall of the opening, so that the position of the two ends defines the path of movement of the valve.

Advantageously, the piston of the present invention is designed such that the housing includes guiding means for guiding movement of the valve between at least two positions. This guiding device is used to optimize the movement of the valve between at least two positions. In particular, the guiding means are, for example, enlarged bands, such as surfaces, which are closely related to the surrounding inner wall of the opening. The abnormal movement of the piston is thus generally limited by the guiding device. If there is no guiding device, re-homing to the sealing position, ie moving from the second position to the first position, may become random rather than predetermined. By defining the geometry of the guiding device, this rehoming motion into the sealing position becomes predetermined and the movement between the two positions can be fully functionally repeated.

Further, it is advantageous that the guiding device of the piston of the present invention includes at least a surface area of the casing having a diameter larger than a surface area in the vicinity of the casing and located near the opening surface. This is an inexpensive and easy way to implement the geometry of the guiding device. This surface area is generally and particularly parallel to the surrounding surface of the opening, that is, the open inner wall portion. The guiding device is formed by simply changing the diameter of the valve body.

The piston of the present invention can be further developed in that the length of the guiding device is greater than 1/15 of the axial length of the valve. For example, the guiding device can have a geometry of 1 mm in the axial direction. Furthermore, the valve itself may have a length of between 10 and 15 mm. The length of the guiding device has a minimum length, so that the guiding device can be implemented in a highly stable and functionally safe manner.

Likewise, the pilot of the piston of the present invention can be located adjacent a fixed pin of the valve device and/or maintain a distance from the sealing device. One of the valve devices is a fixed pin for the valve itself Internally, the valve device is positioned within the valve. The geometry of the retaining pin is typically longer than the diameter of the valve itself. Thus, the fixing pin is visible from outside the valve. Positioning the guide near the fixed pin makes the entire valve construction very compact. The tightness of the valve reduces the overall piston diameter and thus provides the opportunity to reduce the size of the entire door closer.

It is likewise possible that the guiding device of the piston of the invention is located away from the sealing device, in particular from a maximum distance. Positioning the guiding device at the maximum distance maximizes the leverage between the sealing device and the guiding device. Thus the force exerted by the guiding device on the valve is greatest, which forces the valve back to the first position during the homing movement. This produces greater stability in the valve return movement and enhances the functional integrity of the piston of the present invention.

It is also possible in the invention for the piston to be characterized in that the holder comprises at least one spring element, in particular a spring clip. The use of a spring element in the holder reduces the complexity of the manufacturing process. Such a spring element only needs to be compressed and placed in the desired position. After the compression is cancelled, the holder is fixed at the final position.

For this embodiment, it is possible that the retainer is designed to be located in one or more grooves of the outer casing. This results in better alignment and an easier installation process to mount the retainer in the desired position.

It is also possible that the piston of the invention has at least one groove, in particular all grooves, located on the inner wall of the opening. The position of the groove inside the opening allows the exterior of the casing to be designed as a functional surface for other purposes. Providing the grooves on the inside of the inner wall of the opening additionally prevents the holder from colliding with any other parts of the door closer to which the present invention is applied.

Alternatively, in the present invention the retainer is designed to be placed in a crimped position within the outer casing. For example, the retainer can be fixed with different crimping plates. The manufacture of this embodiment is thus optimized. In particular, no additional steps are required to machine the grooves. An extra workstation in the machine can be eliminated. Another advantage of this embodiment is that a shoulder can be made instead of a groove when drilling in the outer casing. The shoulder can form a flat surface against which the retainer is pressed when the crimping plate is pressed. In other words, the shoulder and the rolled plate form an alternative manufacturing of the groove. Using crimp The plate is particularly preferably implemented in two or more, and more preferably three or more. The plates are, for example, symmetrical to the central axis of the pressure relief valve and/or star-shaped to the central axis. In this way, the retainer tilt can be avoided and/or reduced. The crimping of the crimping plate can be done by hand or by hand tools. It is advantageous to use the machine in the crimping step, depending on the material or geometry of the board. The crimping plate can be integrally formed with the outer casing. However, the rolled plate can also be manufactured separately and fixed afterwards. Such fixing can be carried out, for example, by welding or press fitting.

It is also possible that in the present invention, the valve of the piston of the present invention has at least one through hole on each side of the guiding device with respect to the main axis of the valve. This provides the possibility of oil return. In the second position, the valve seal is outside the sealed position. The oil body can flow to the through holes on both sides of the guiding device and bypass the guiding device. In addition, the oil body can follow this path to the outside from the inside of the outer casing of the piston, in particular the valve means bypassing the valve.

It is also possible that the piston and the opening valve of the present invention have a rotationally symmetrical structure, and the valve has a head having a diameter larger than the diameter of the valve shaft portion. Such a head is designed to block movement of the valve in the second direction and define a second position of the valve. In addition, it can hold the sealing device at a predetermined position on the head. A rotationally symmetrical structure makes the valve body itself easy to manufacture and additionally reduces the complexity of manufacture, i.e., the valve is inserted into the opening.

Another object of the present invention is to provide a pressure relief valve having a valve device and a surrounding housing having a sealing device designed for use in a piston of the present invention. Thus, the pressure relief valve of the present invention has the same advantages, which have been described in detail above for the piston of the present invention.

It is still another object of the present invention to provide a method of damping a piston of a door closer by using the piston of the present invention. Thus, such a method has the same advantages as described above for the piston of the present invention.

Figure 1 shows a piston 10 of the present invention. It has a cavity in a housing 30 20. The outer casing 30 additionally has an opening 32 through which oil can flow in both directions. A pressure relief valve 40 is built into the opening 32 to pre-define the flow of oil through the opening 32. A retainer 50 is located within one of the grooves of the outer casing 30 to maintain the pressure relief valve 40 in its position.

The pressure relief valve 40 is depicted in detail in FIG. It has a valve device 42 located within the body of the valve 40. A spring element is visible through a through hole 41 which presses the valve body into a sealed position. Further, a fixing pin 43 is located at the valve 40 to hold the spring member and the valve body of the valve device 42 at predetermined positions.

The function of the pressure relief valve will be described below with reference to Figs. In one case, when the pressure outside the outer casing 30 is higher than the cavity 20 in the outer casing 30, the head 40a of the valve 40 housing 44 is pressed into the first position, as shown in FIG. In this first position, the sealing device 46 located adjacent the head 40a is held in a sealed position. Thus, the valve 40 seals the cavity 20 within the outer casing 30. If there is an oil body, the oil body is allowed to flow only when the oil pressure outside the outer casing 30 exceeds a certain pressure value, which is determined by the valve device 42 of the valve 40. If the pressure exceeds the pressure value, valve device 42 of valve 40 opens against the spring force and oil can flow into chamber 20. It must be stated that, in this case, the pressure relief valve 40 is stopped at the position shown in FIG. If the pressure difference is in the opposite direction, i.e., if the pressure in the outer casing 30 is high, the valve means 42 is closed and the entire valve 40 is moved along the path of travel. This movement is blocked by the holder 50 in the second position. This second position is shown in Figure 3. As can be seen in Figure 3, the sealing device 46 does not contact the outer casing 30. The valve 40 is thus no longer sealed to the outer casing 30. To ensure that oil can flow from the chamber to the exterior of the outer casing 30, the through holes 41 are located on either side of a guide 48. Thus, the oil can exit the chamber 20 through all of the blocking elements, particularly the sealing device 46.

As can be seen from Figures 2 and 3, a guiding device 48 is provided. It is designed to be wide and wide, surrounded by the surface of the inner wall of the opening 32. If the valve 40 is in the second position shown in Figure 3 and is intended to be moved back to the first position, the guide 48 ensures that the valve 40 does not tilt. Thus the guiding device 48 assists the valve 40 in returning to the first position, in particular re-tightening The sealing device 46 is positioned at a predetermined sealing position.

Figures 4a and 4b show one possible embodiment of the holder 50. This embodiment is designed as a spring element. This spring element has two legs that can be elastically compressed and enter the position shown in Figure 4b. For example, it can be placed in one of the grooves in the inner wall of the opening 32. Figure 4b shows a view from the left side of Figures 2 and 3, in which valve 40 and valve means 42 are visible. The retainer 50 is located within the opening 32, thus defining a second position of the valve 40.

Another method of positioning and securing the retainer 50 is shown in Figure 4c. The three plates 49 are rolled toward the holder 50. The retainer 50 is held in its position without the need for additional grooves. To achieve the fixation of the retainer 50, the crimping plate 49 is formed on the outer side of the outer casing 30 after the opening 32 is drilled. In the next step, the pressure relief valve 40 is inserted into the opening 32. After the pressure relief valve 40 is positioned, the retainer 50 can be positioned beside the pressure relief valve 40. After the positioning step, the plate 49 is rolled inwardly to the position shown in Figure 4c. The crimping step can be carried out by hand or using a tool or a machine. This is based on the geometry of the plate 49 and/or its material. Plate 49 may be formed from the material of outer casing 30. For example, a milling step can be used as the processing step. Obviously, the plates 49 can also be manufactured separately and rolled from the outside during use. The fixing of the crimping plate 49 can be determined, for example, by welding or press fitting, and the geometric relationship between the viewing plate 49 and the outer casing 30.

It must be noted that the retainer 50 of Figure 4c can be fully secured between the plate 49 and a shoulder (not shown) inside the opening 32. In addition, it must be pointed out that one shoulder can be easily machined in the first drilling step, and no additional steps are required, and additional steps are required for the groove. It is obvious that an embodiment may not have such a shoulder. The number of crimping plates 49 is not limited to three crimping plates 49. However, three or more plates 49 are advantageous because the tilting movement of the retainer 50 can be prevented. The different plates 49 are, for example, symmetrical and/or star-shaped for the centerline of the pressure relief valve. Its direction further prevents the tilt of the retainer 50.

The foregoing description of the embodiments of the invention are intended to illustrate the invention Obviously, any of the different features of technical significance can be combined without departing from the scope of the invention. Domain.

10‧‧‧Piston

20‧‧‧ cavity

30‧‧‧Shell

32‧‧‧ openings

40‧‧‧pressure relief valve

40a‧‧‧ head

40b‧‧‧Axis

41‧‧‧through hole

42‧‧‧ valve device

43‧‧‧fixed pin

44‧‧‧ housing

46‧‧‧ Sealing device

48‧‧‧Guide

49‧‧‧ boards

50‧‧‧ Keeper

The invention will be described in detail below based on the drawings. The so-called "left", "right" and "lower" are generally readable reference symbols according to the drawing. 1 shows an embodiment of a piston of the present invention, and FIG. 2 shows an embodiment of a pressure relief valve. In the first position of the piston of the present invention, the pressure relief valve of FIG. 3 and FIG. 2 is located at the second position. In the case of Figure 4a, one embodiment of the retainer, the embodiment of the retainer of Figures 4b and 4a is in the installed position, and the embodiment of the retainer of Figures 4c and 4a is in the other mounting position.

10‧‧‧Piston

20‧‧‧ cavity

30‧‧‧Shell

32‧‧‧ openings

40‧‧‧pressure relief valve

50‧‧‧ Keeper

Claims (14)

A piston (10) for a door closer includes a cavity (20) having a surrounding outer casing (30), and at least one opening (32), and a pressure relief valve (40) is located in the opening (32) Moving between at least two positions, characterized in that the valve (40) has a valve device (42) and a surrounding casing (44) having a sealing device (46), and the opening (32) is at the valve (40) Sealed in one direction, a retainer (50) is provided in the outer casing (30) for defining the second position of the valve (40). A piston (10) according to the first aspect of the invention, characterized in that the housing (44) comprises guiding means (48) for guiding the movement of the valve (40) between at least two positions. The piston (10) according to claim 2, wherein the guiding device (48) comprises at least one surface area of the housing (44), the diameter of the area being larger than the surface area of the nearby housing (44) The diameter is close to the surface of the opening (32). The piston (10) according to any one of claims 2 to 3, wherein the length of the guiding device (48) is greater than 1/15 of the axial length of the valve (40). The piston (10) according to any one of claims 2 to 4, wherein the guiding device (48) is located adjacent to the fixing pin (43) of the valve device (42) and/or is sealed. The device (46) maintains the distance. The piston (10) according to any one of the claims 2 to 5, characterized in that the guiding device (48) is kept at a distance from the sealing device (46), in particular to maintain a maximum distance. A piston (10) according to any one of the preceding claims, characterized in that The holder (50) has at least one spring element, in particular a spring clip. The piston (10) according to item 7 of the aforementioned patent application, characterized in that the holder (50) is designed to be located in one or more grooves of the outer casing (30). The piston (10) according to item 8 of the aforementioned patent application, characterized in that at least one groove, in particular all grooves, is located on the inner wall of the opening (32). The piston (10) according to item 7 of the aforementioned patent application, characterized in that the retainer (50) is located at a crimping position of the outer casing (30). A piston (10) according to any one of the preceding claims, wherein the valve (40) has at least one through hole (41) on both sides of the guiding device (48) with respect to the main axis of the valve (40). . A piston (10) according to any one of the preceding claims, wherein the valve (40) and the opening (32) have a rotationally symmetrical structure, and the valve (40) has a head (40a) having a diameter It is larger than the diameter of the shaft portion (40b) of the valve (40). A pressure relief valve (40) comprising a valve device (42) and a surrounding housing (44) having a sealing device (46) designed for use in claims 1 to 12 The piston (10) of any of the above. A method of damping a piston (10) of a door closer by using a piston (10) as described in claims 1 to 12.