JP3501384B2 - Door closer speed controller - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a speed control device of a door closer. 2. Description of the Related Art As a conventional door closer speed control device, for example, the one disclosed in Japanese Utility Model Laid-Open No. 2-85780 can be mentioned. The device communicates the first chamber and the second chamber via an orifice with a cylinder filled with hydraulic oil, a piston partitioning the cylinder into a first chamber in the front and a second chamber in the rear. The oil guide path, a return spring for urging the piston toward the first chamber, a rack provided on the piston, a pinion that meshes with the rack, and are supported by the cylinder and fixed to the pinion and the link arm. A rotary shaft, a bypass arranged in parallel with the oil guide path, and communicating the first chamber and the second chamber through a piston, and a check valve having a spherical valve body provided in the bypass at a front end of the piston. Has a tool engaging portion provided at the front bottom portion of the cylinder so as to be adjustable in projecting length toward the valve body in order to remove the valve body of the check valve from above the valve seat near the end of the closing operation of the door. Release pin. According to this device, at a desired angular position near the end of the closing operation of the door, the check valve of the bypass provided in parallel with the oil guide path having the orifice is opened by the release pin. As a result, the buffering action of the hydraulic oil and the orifice can be eliminated, so that the door closing speed can be increased at an appropriate and safe angular position. [0006] Therefore, the closing force of the door is increased at the end stage, and the door is completely closed with a smooth latching action. However, in the above-mentioned conventional device, the release pin is mounted on the front bottom of the cylinder, and the valve seat of the valve body is provided on the piston. The abutment point where the pin collides with the spherical valve element occupies a position different from the center axis in a plane perpendicular to the sliding direction of the piston for each product. This phenomenon occurs when the front bottom (cylinder cap) of the cylinder, the cylinder body, and the piston are assembled, and makes it difficult to cause the release pin and the valve body to collide at a stable appropriate position. The speed control device of the door closer according to the present invention realizes a collision point between the release pin and the valve body at the start of the latching action of the closing operation of the door as expected in design, and can perform an accurate latching action for a long time. It has been proposed for the purpose of doing so. [0010] In order to achieve the above object, the present invention provides a cylinder filled with hydraulic oil, and a piston which divides the cylinder into a front first chamber and a rear second chamber. An oil guide path communicating the first chamber and the second chamber via the orifice, a return spring for urging the piston toward the first chamber, a rack provided on the piston, and a pinion meshing with the rack. A rotary shaft supported by the cylinder and fixed to the pinion and the link arm; a bypass juxtaposed to the oil guide passage and communicating the first chamber and the second chamber through the piston; and a front end of the piston. A check valve having a spherical valve body provided at a bypass in the section, and a piston at the front end of the piston for removing the valve body of the check valve from above the valve seat near the end of the closing operation of the door. Slidable parallel to the center axis A release pin provided in the piston, a projecting spring provided in the piston and biasing the release pin so that its tip projects toward the front bottom of the cylinder, and a release spring for appropriately determining the operation start position of the release pin. An adjusting screw having a tool engaging portion at an outer end thereof is screwed to a front bottom portion of the cylinder so that an end thereof is opposed to a tip end of the release pin. Referring to FIG. 1, adjustment of the latching action start position by the release pin 7 on the piston 2 is performed by inserting a tool such as a screwdriver into the tool engaging portion 81 of the adjusting screw 8 and then adjusting the right or left position. The rotation is performed by At that time, the adjusting screw 8 is displaced in the axial direction within a range of a distance l. As shown in FIG. 2, when the door closer according to the present invention reaches the closed state, the tip of the release pin 7 abuts on the inner end (tip) of the adjustment screw 8 adjusted to the optimum position. Is pushed inwardly of the piston 2 against the projecting spring 72, so that the abutting piece 71 of the pin 7
2. Remove the valve body 61 seated on top. Then, the buffering action of the hydraulic oil and the orifice is released, and the door is completely closed under the latching action. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. 1 and 2, reference numeral 1 denotes a cylinder filled with hydraulic oil, 13 denotes a cylinder cap forming a front bottom of the cylinder 1, 2 denotes a cylinder cap inserted into the cylinder 1, and the cylinder 1 And a piston 14 which is divided into a second chamber 12 at the rear and a second chamber 1 at the high pressure side and a second chamber 1 at the low pressure side via an orifice (not shown).
An oil guide path for communicating with the first chamber 11 and the piston 2 are connected to the first chamber 11.
2 shows a return spring biased toward. A rack 51 is provided in the piston 2 along the sliding direction, and a pinion 52 is engaged with the rack 51. The pinion 52 is fixedly provided with a rotating shaft 53 that rotates together.
Has been supported. Also, as is well known, the rotating shaft 5
One of the link arms (not shown) is fixedly provided at the outer end of 3. Reference numeral 21 denotes a bypass provided in the piston 2, which is provided in parallel with the oil guide 14, and communicates between the first chamber 11 and the second chamber 12 of the cylinder 1. Reference numeral 4 denotes a filter provided in the middle of the bypass 21, and reference numeral 41 denotes a sphere for preventing the filter 4 from falling off. A check valve 6 having a spherical valve element 61 is provided on the bypass 21 at the first chamber 11 side of the piston 2, that is, at the front end. As shown in FIG. 1, the valve body 61 has a hydraulic oil in the first chamber 11 on the high pressure side in almost all regions except a region at a front position in the stroke of the piston 2 (see FIG. 2). The piston 21 is pressed against and seated on the valve seat 62 on the piston 2 to prevent the flow of hydraulic oil by the bypass 21. In the drawing, reference numeral 63 denotes a falling-off prevention pin fixed to the piston 2 in order to prevent the valve body 61 of the check valve 6 from rolling out of the accommodating portion of the piston 2. Further, a release pin 7 is mounted near the check piece 6 at the front end of the piston 2 so as to be slidable along the central axis of the piston 2. The distal end of the release pin 7 is supported by a stop member 73 screwed to the front end of the piston 2 and also serving as a slide guide. It is fitted in the hole 74. In order to mount the stop member 73 on the front end surface of the piston 2, for example, as shown in FIGS. A stopper screw 73 is formed by drilling a female screw in the actual inner peripheral surface of the stopper member mounting hole 22.
Screw. In the embodiment shown, the release pin 7 is arranged along the central axis of the piston 2, in other words such that the central axis of the release pin is coaxial with that of the piston 2. It is not an essential component of the invention. In FIG. 4, reference numeral 75 denotes an eyehole for engaging with a tool screwed into the piston 2 by turning the set screw member 73. On the other hand, when the release pin 7 is retracted, the hydraulic oil in the sliding hole 74 is not compressed by the rear end of the release pin 7 as shown in FIG. A part of the outer peripheral surface has been stolen meat. When the pin 7 slides rearward, the flange-shaped abutting piece 71 provided at the central portion in the longitudinal direction of the release pin 7 abuts on the valve element 61 on the valve seat 62 to thereby disengage it. Although the release pin 7 is removed from the valve seat 62, the release pin 7 also serves as a retaining piece for preventing the entire release pin 7 from slipping forward. A projecting spring 72 is provided around the rear half of the release pin 7 so as to bias the release pin 7 toward the front bottom portion 13 of the cylinder 1. On the other hand, an adjusting screw 8 having a tool engaging portion 81 for engaging a driver or other tools at the outer end thereof is screwed into the cylinder cap, that is, the front bottom portion 13 of the cylinder 1. The inner end of the adjusting screw 8 is made to face the distal end of the release pin 7. By screwing this adjusting screw 8 to an appropriate depth in advance, the releasing pin 7 can be adjusted when the door is closed. The protrusion length from the piston 2 is properly determined by contact with the piston (see FIG. 2). Reference numeral 82 denotes an adjustment screw 8
0 ring attached to the annular groove of FIG. According to the door closer speed control apparatus of the present invention described above, the release pin for adjusting and setting the start timing of the latching action and the valve seat for seating the valve element are the same member. Because it is provided on the piston, assembly errors during assembly of this device can be minimized, the collision point between the release pin and the valve element is realized as expected in the design, and the latching action can be performed for a long time. To be able to do so.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial longitudinal plan view showing a main part of an embodiment of the present invention in a door closing operation process. FIG. 2 is a partial longitudinal plan view of the door after closing. FIG. 3 is a partially enlarged sectional view of a piston. FIG. 4 is an enlarged front view of a piston. FIG. 5 is an enlarged sectional view taken along line VV in FIG. 3; [Description of Signs] 1 Cylinder 11 First chamber 12 Second chamber 13 Front bottom part 14 Oil guide path 2 Piston 21 Bypass 3 Return spring 51 Rack 52 Pinion 53 Rotary shaft 6 Check valve 61 Valve body 62 Valve seat 7 Release pin 71 Tool engaging part 72 Projection spring 8 Adjusting screw 81 Tool engaging part

Claims (1)

(57) [Claim 1] A cylinder filled with hydraulic oil, a piston for dividing the cylinder into a front first chamber and a rear second chamber, and a first chamber via an orifice. An oil guide passage communicating with the second chamber, a return spring for urging the piston toward the first chamber, a rack provided on the piston, a pinion meshing with the rack, and a pinion and A rotary shaft fixed to the linking arm, a bypass arranged in parallel with the oil guide passage and communicating the first chamber and the second chamber through a piston, and a spherical valve provided at a bypass at a front end of the piston. A non-return valve having a body and slidable parallel to the central axis of the piston at the front end of the piston for removing the valve body of the check valve from above the valve seat near the end of the closing operation of the door And a release pin provided in the piston, A projecting spring that urges the tip of the release pin to project toward the front bottom of the cylinder, and a cylinder whose inner end faces the tip of the release pin to properly determine the operation start position of the release pin. And an adjusting screw having a tool engaging portion at an outer end screwed to a front bottom of the door closer.