JPH0735070Y2 - Door latch device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door latch device having a small turning angle of a handle.

[0002]

2. Description of the Related Art As a general door latch device, there are an open type device which rotates a door knob, a push type device which pushes a lever, and the like, and the latter type is said to be desirable for persons with disabilities or children.

The structure of the conventional pressing type door latch device is as follows.
As shown in FIG. 8, the overall shape is cylindrical, and has a cylindrical case S attached to the recessed hole portion of the door R, and a door latch L provided in the case S. . To operate this door latch device, the handle H is operated in the R1 direction and the cam C is rotated in the R2 direction. Since the drive plate D is engaged with the cam C, the drive plate D moves to the right by the rotating operation. When the drive plate D moves to the right, the door latch L attached thereto is retracted in the direction R3 by a predetermined stroke L2, and the door R is opened.

[0004]

However, when the handle R is rotated to open the door R, the door latch L is retracted in the direction R3. In this case, the stroke of the door latch L is the length of the arc of the cam C. Angle of the handle H is equal to
Is large, for example, about 70 degrees, which is inconvenient for persons with disabilities or those who carry luggage in both hands because the handle H has to be operated greatly.

The present invention has been made in view of the above situation, and solves the drawbacks and inconveniences of the prior art, and provides a door latch device capable of easily opening a door even if the turning angle of the handle is small. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a bottomed cylindrical case whose one end opening is closed by a fixing plate, and which penetrates through the fixing plate and projects to the outside. A door latch that is biased by a spring and is movable back and forth in the axial direction of the case, and has a front end plate connected to the door latch and a rear end plate inside the case, and slides axially along the bottom of the case. A door latch portion having a driven plate provided so that a lower end portion abuts on the rear end plate, and an upper end portion is rotatably supported by the pivot with respect to the case, and a rear portion of the case. A drive shaft that is pivotally supported and has a handle shaft inserted through it, a cam that is provided on the opposite side of the handle centering on this drive shaft, and that is provided at the rear end of the case for constantly repelling the handle horizontally. A handle driving device having a spring, A front convex plate that is provided so as to slide along the axial direction on the upper part of the case and abuts between the lower end and the upper end of the drive lever, and a rear convex that receives a pressing force that is pressed forward by a spring. Plate, an intermediate convex plate provided between the front convex plate and the rear convex plate and pressed by the cam, and a slide having a long groove provided between the front convex plate and the rear convex plate and through which the cam can be inserted. A door latch device comprising a plate, and a sliding plate presses between upper and lower end portions of a drive lever via a cam by rotation of the handle. It is preferable that the handle driving device has a stopper at the center of the case for limiting the rotational position of the cam when the handle is returned. It is preferable that an upper end portion of the drive lever is pivotally supported on an upper portion of the case by a bracket. It is preferable that the door latch has a latch rod that is screwed at a front end and is inserted at a rear end so as to be able to advance and retract into a through hole formed in a spring receiving member that supports the spring. In the drive lever, it is preferable that a portion with which the front convex plate abuts has an arc surface and the lower end portion has a spherical surface or an arc surface.

[0007]

In the door latch device constructed as described above, when the handle is rotated, the cam of the handle driving device is rotated, the intermediate convex plate of the sliding plate is linearly moved, and the front convex plate of the sliding plate is moved. The intermediate portion of the drive lever is pushed, and this push causes the drive lever to rotate a predetermined amount about the pivot. This rotation amount is amplified at the lower end, and the trailing vertical plate of the driven plate, which is in contact with the lower end, can be largely moved to retract the door latch portion and open the door.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention.
2 is a plan view of FIG. 1, FIG. 3 is a plan view of a handle driving device of the same embodiment, FIG. 4 is a plan view of a drive plate of the same embodiment, and FIG. 5 is the same embodiment. FIG. 6 is a perspective view of the drive lever of FIG. 6, FIG. 6 is a cross-sectional view as seen from the front showing the operating state of the embodiment, and FIG. 7 is an explanatory diagram showing the operating state of the embodiment.

In this embodiment, as shown in FIGS.
It is fixed and attached to the
And a door latch portion 2 provided at the front end of the case 1.
A handle driving device 3 provided at the rear end of the case 1, a slide plate 4 provided between the door latch portion 2 and the handle driving device 3, and a drive lever 5 for driving the slide plate 4. have.

First, the case 1 is composed of two casing pieces 11, 11 as shown in FIG. 2, and is formed in a bottomed tubular shape by aligning the two casing pieces 11, 11 in the middle. The front end of the case 1 is fixed by welding or the like so that a front end fixing plate 12 attached to the door 6 with a screw closes the end opening, and a rear opening 13 and a front opening 14 are provided at the center of the upper part. There is. The rear opening 13 is a portion where a cam 33, which will be described later, projects.
The front opening 14 is a portion through which the drive lever 5 is inserted.

The door latch portion 2 has a latch 21 fitted in a latch hole 121 of a front end fixing plate 12 so as to be able to move forward and backward, and a latch rod 22 having a tip screwed into a screw hole 221 of the latch 21.
And is attached to the rear end of the latch rod 22,
A spring receiving member 24 inserted into the hole 241; a spring 23 fitted and inserted between the spring receiving member 24 and a front end vertical plate 251 to be described later to repel the latch 21 outwardly; 1 has a driven plate 25 slidably mounted on the lower casing piece 11 and having a front end vertical plate 251 at the front and a rear end vertical plate 252 at the rear.

The handle driving device 3 is rotatably attached to the case 1 as shown in FIG. 6, and has a drive shaft having a through hole 32 formed in the center through which the square shaft 30a of the handle 30 of the door 6 is inserted. 31, a fan-shaped cam 33 provided on the opposite side of the drive shaft 31, a spring 34 provided at the rear end of the case 1 for constantly repelling the handle 30 in the horizontal direction in the figure, The case 1 has a stopper 35 which is provided in the center of the case 1 so as to extend horizontally and which specifies the return position of the cam 33 when the handle 30 is released.

As shown in FIG. 4, the sliding plate 4 is press-molded and has a rectangular shape as a whole, and has an elongated hole 44 formed at the center and a rear end (the right end in the drawing). ), The rear convex plate 42, the intermediate convex plate 41 projecting upward at the right end of the long hole 44, and the front convex plate 43 hanging downward at the left end of the long hole 44. Have The sliding plate 4 projects a protrusion (not shown) from, for example, a part of the case 1 with respect to the case 1 so as to slide along the upper surface 16 of the case 1 between the spring receiving member 24 and the drive shaft 31. Supported by a method such as
The intermediate convex plate 41 presses the cam 33 partially pushed out of the elongated hole 44 and the front opening 13 by this force, and the front convex plate 43 comes into contact with the vicinity of the central portion of the drive lever 5. The drive lever 5 is driven.

The drive lever 5 includes a rear opening 14 of the case 1.
Has a pivot 51 rotatably supported by a bracket 52 on the upper surface 16 of the case 1. The front convex plate 43 is provided near the center of the drive lever 5.
The lever intermediate projection 53 is formed to be pressed by, and the lower end portion 54 is a spherical surface or an arc surface to which the driving force is transmitted by the rear end vertical plate 252 of the driven plate 25.

Next, the operation will be described. When the door 6 is opened, the handle 30 is rotated at a rotation angle A1 as shown in FIG. As a result, the cam 33 of the handle driving device 3 rotates in the R2 direction and linearly moves the intermediate convex plate 41 of the sliding plate 4 in the L1 direction. Along with this, the front convex plate 4 of the sliding plate 4
3 pushes the intermediate projection 53 of the drive lever 5 to actuate the arc-shaped L1 stroke with respect to the intermediate projection 53 as shown in FIG. 7, but the lower end portion 54 is amplified and L2 stroke is performed. It will work only for minutes. Therefore, the rear end vertical plate 252 of the driven plate 25, which is in contact with the lower end portion 54, is actuated by the amplified L2 stroke, thereby retracting the door latch 21 and opening the door 6. In other words, in this embodiment, even if the movement stroke of the drive lever 5 is initially as small as the L1 stroke, this is amplified and the driven plate 25 is actuated, so the rotation angle A1 of the handle 30 is small. But you will be able to open the door. In this embodiment, FIG.
As shown in, the rotation angle A1 of the handle 30 may be 30 degrees,
As compared with the rotation angle A (70 degrees) of the conventional door latch device, the door can be opened at a much smaller angle.

[0016]

As described above, according to the present invention, when the handle is rotated, the amount of rotation is amplified and the door latch portion is actuated to open the door. The door can be easily opened for those who have an object in both hands.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a sectional view seen from the front.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view of the handle driving device of the embodiment.

FIG. 4 is a plan view of a drive plate of the same embodiment.

FIG. 5 is a perspective view of a drive lever of the same embodiment.

FIG. 6 is a sectional view seen from the front, showing an operating state of the embodiment.

FIG. 7 is an explanatory diagram showing an operating state of the embodiment.

FIG. 8 is a cross-sectional view showing a conventional door latch device.

FIG. 9 is an explanatory view comparing the rotation angles of the present invention and the conventional one.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Door latch part, 3 ... Handle drive device, 4 ... Sliding plate, 5 ... Drive lever, 12 ... Fixed plate, 21 ... Door latch, 211 ... Screw, 22 ... Latch bar, 23 ... Spring, 24 ... Spring receiving member, 241 ... Through hole, 25 ... Follower plate, 251 ... Front end plate, 252 ... Rear end plate, 30 ... Handle, 30a ... Handle shaft, 31 ... Drive shaft, 33 ... Cam, 34 ... Spring, 35 ... Stopper, 41 ... Intermediate convex plate, 42 ... Rear convex plate, 43 ... Front convex plate, 44 ... Long groove, 52 ...
Bracket, 54 ... Lower end.

Claims (5)

[Scope of utility model registration request] 1. A bottomed cylindrical case (1) whose one end opening is closed by a fixing plate (12), and a spring (23) penetrating the fixing plate (12) and projecting to the outside.
A door latch (21) that is urged to move forward and backward in the axial direction of the case (1), and a front end plate connected to the door latch (21)
(251) and a door latch part having a driven plate (25) provided so as to axially slide along the bottom of the case (1) and having a rear end plate (252) provided inside the case ( 2), the lower end portion (54) contacts the rear end plate (252), and the upper end portion is pivoted.
A drive lever (5) rotatably supported by the case (52) and a shaft (3) of the handle (30) pivotally supported by the rear part of the case (1).
Drive shaft (31) through which (0a) is inserted, a cam (33) provided on the opposite side of the handle (30) centering on the drive shaft (31), and a handle (3) provided at the rear end of the case (1) and A handle driving device (3) having a spring (34) for horizontally repulsing the (30), and a driving lever (3) provided so as to slide along the axial direction at the upper part of the case (1). The front convex plate (43) that abuts between the lower end portion (54) and the upper end portion of (5), the rear convex plate (42) that receives the pressing force pressed forward by the spring (34), the front convex plate (43)
Intermediate convex plate (41) provided between the front convex plate (43) and the rear convex plate (42) and pressed by the cam (33).
The long groove (4 provided between the (42) and the cam (33) can be inserted.
A sliding plate (4) having a sliding plate (4) and a sliding plate (4) via a cam (33) by the rotation of the handle (30).
The door latch device is characterized in that the drive lever (5) presses between the upper and lower ends of the drive lever (5). 2. The handle drive device (3) has a stopper (35) for limiting the rotational position of the cam (33) when the handle (30) is returned to the center of the case (1). The door latch device described in 1. 3. The door latch device according to claim 1, wherein an upper end of the drive lever (5) is pivotally supported on an upper portion of the case (1) by a bracket (52). . 4. The door latch (21) has a front end screwed (21).
1) has a latch rod (22) screwed by the rear end and inserted so as to be able to move back and forth into a through hole (241) formed in a spring receiving member (24) for supporting the spring (23). The door latch device according to claim 1. 5. The drive lever (5) includes the front convex plate (4).
The door latch device according to claim 1, wherein a portion with which 3) contacts is an arc surface, and the lower end portion (54) is a spherical surface or an arc surface.