JPH0596355U - Door latch device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a door latch device with a small turning angle of a handle and capable of easily opening a door. [Structure] An upper end of a drive lever 5 for advancing and retracting a door latch 21 is rotatably supported, and an intermediate portion of the drive lever is operated by a front convex plate 43 of a sliding plate 4 operated by a handle. By utilizing the fact that the lower end of the drive lever moves with a stroke larger than that of the middle portion, the door latch is actuated to a greater extent than the amount of movement of the handle. [Effect] When the handle is rotated, this amount of rotation is amplified and the door latch can be greatly operated to open the door.
The door can be easily opened for people with disabilities.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a door latch device having a small turning angle of a handle.

[0002]

[Prior Art]

 As a general door latch device, there are an opening type that rotates a door knob and a pushing type that pushes a lever. The latter type is said to be desirable for persons with disabilities or children.

As shown in FIG. 8, the structure of a conventional pressing type door latch device has a tubular shape as a whole, and a tubular case S attached to the recessed hole portion of the door R and a case. S has a door latch L provided inside. To operate the 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]

[Problems to be solved by the device]

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

The present invention has been made in view of the above situation, and eliminates the drawbacks and inconveniences of the prior art, and enables a door to be opened easily even if the turning angle of the handle is small. The purpose is to provide a device.

[0006]

[Means for Solving the Problems]

 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 a spring-biased case shaft that penetrates through the fixing plate and projects to the outside. A door latch provided so as to be movable back and forth in a direction, a front end plate connected to the door latch and a rear end plate provided inside the case, and a follower provided to slide axially along the bottom of the case. A door latch having a plate, a lower end abutting against the rear end plate, and a drive lever whose upper end is rotatably supported with respect to the case by a pivot, and a handle pivotally supported by the rear of the case to hold the handle inside. Drive shaft through which the shaft of the handle is inserted, a cam provided on the opposite side of the handle around this drive shaft, and a handle drive having a spring provided at the rear end of the case for constantly repelling the handle horizontally. The device and the axial direction at the top of the case A forward convex plate that is provided so as to slide along and that abuts between the lower end and the upper end of the drive lever, a rear convex plate that receives a pressing force that is pressed forward by a spring, a front convex plate and a rear An intermediate convex plate which is provided between the convex plate and the cam and is pressed by the cam, and a sliding plate which is provided between the front convex plate and the rear convex plate and has a long groove through which the cam can be inserted. The door latch device is characterized in that a sliding plate presses between upper and lower ends of a drive lever via a cam by turning a handle. It is preferable that the handle driving device has a stopper at a center of the case for limiting a rotational position of the cam when the handle is returned. It is preferable that an upper end portion of the drive lever is rotatably supported on an upper portion of the case by a bracket. It is preferable that the door latch has a latch rod screwed at a front end thereof and inserted at a rear end thereof so as to be able to advance and retreat into a through hole formed in a spring receiving member for supporting the spring. It is preferable that in the drive lever, a portion with which the front convex plate contacts is an arc surface, and the lower end portion is a spherical surface or an arc surface.

[0007]

[Action]

 In the door latch device configured as described above, when the handle is rotated, the cam of the handle driving device is rotated to linearly move the intermediate convex plate of the sliding plate, and the front convex plate of the sliding plate is moved to the front convex plate of the driving lever. The intermediate portion is pushed, and this pushing causes the drive lever to rotate about the pivot axis by a predetermined amount. 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]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. 1 shows an embodiment of the present invention. FIG. 1 is a sectional view seen from the front, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a plan view of a handle driving device of the same embodiment, and FIG. 5 is a plan view of the drive plate of the example, FIG. 5 is a perspective view of the drive lever of the same embodiment, FIG. 6 is a cross-sectional view seen from the front showing the operating state of the same embodiment, and FIG. FIG.

In this embodiment, as shown in FIGS. 1 to 6, the door 6 is fixedly attached to the door 6, and mainly includes a case 1, a door latch portion 2 provided at a front end of the case 1, and a case 1. It has a handle driving device 3 provided at the rear end thereof, a sliding plate 4 provided between the door latch portion 2 and the handle driving device 3, and a drive lever 5 for driving the sliding plate 4. There is.

First, the case 1 is composed of two casing pieces 11, 11 as shown in FIG. 2, and is formed into 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 the 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. Has been. The rear opening 13 is a portion where a cam 33 described later projects, and the front opening 14 is a portion where the drive lever 5 is inserted.

The door latch portion 2 includes a latch 21 fitted in a latch hole 121 of the front end fixing plate 12 so as to be able to move forward and backward, a latch rod 22 having a tip screwed into a screw hole 221 of the latch 21, and a latch rod 22. The latch rod 22 is attached to the rear end, and the latch rod 22 is inserted into the hole 241. The spring bearing member 24 is fitted between the spring bearing member 24 and a front end vertical plate 251, which will be described later, and the latch 21 is projected outward. As described above, a spring 23 that rebounds and a driven plate 25 that is slidably mounted on the lower casing piece 11 of the case 1 and has a front vertical plate 251 at the front and a rear vertical plate 252 at the rear are provided. is doing.

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, and a bar 34 provided at the rear end of the case 1 for constantly repelling the handle 30 in the horizontal direction in the figure. A stopper 35 is provided in the center of the case 1 so as to extend horizontally and specifies a 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 a long hole 44 formed at the center and a rear end (the right end in the drawing). ), An intermediate convex plate 41 protruding upward at the right end of the long hole 44, and a front convex plate 43 hanging downward at the left end of the long hole 44. I have. The sliding plate 4 projects a protrusion (not shown) from, for example, a part of the case 1 so that the sliding plate 4 slides along the upper surface 16 of the case 1 between the spring bearing member 24 and the drive shaft 31. And the rear convex plate 42 is pressed by the spring 34, and this force causes the intermediate convex plate 41 to press the cam 33 partially protruding from the elongated hole 44 and the front opening 13 to move forward. The convex plate 43 comes into contact with the vicinity of the central portion of the drive lever 5 to drive the drive lever 5.

The drive lever 5 is hung down through the rear opening 14 of the case 1, and has a pivot shaft 51 rotatably supported by a bracket 52 on the upper surface 16 of the case 1. A lever intermediate protrusion 53 pressed by the front convex plate 43 is formed near the central portion of the drive lever 5, and a lower end portion 54 has a spherical surface or an arc to which the driving force is transmitted by the rear end vertical plate 252 of the driven plate 25. It is regarded as a face.

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 43 of the sliding plate 4 pushes the intermediate protrusion 53 of the drive lever 5, and as shown in FIG. 7, the intermediate protrusion 53 is operated by an arc-shaped L1 stroke. However, the lower end portion 54 is amplified and operates for L2 strokes. 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, which causes the door latch 21 to be retracted and the door 6 to be opened. 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. However, you will be able to open the door. In this embodiment, as shown in FIG. 9, the turning angle A1 of the handle 30 may be 30 degrees, which is much smaller than the turning angle A (70 degrees) of the conventional door latch device. You will be able to open it.

[0016]

[Effect of the device]

 As described above, according to the present invention, when the handle is rotated, the amount of this rotation is amplified and the door latch can be operated to open the door, so that a person with disabilities, a child or both hands can carry an object. For those who are doing this, the door can be easily opened.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a sectional view as 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 cross-sectional view seen from the front showing the 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 cylindrical case (1) having a bottom 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 (2) having a rear end plate (252) provided inside the case and having a driven plate (25) provided so as to slide in the axial direction along the bottom of the case (1) ( 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 repelling (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 long groove (4) 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 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 driving 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 bar (22) screwed by the rear end and inserted so as to be able to advance and retract into a through hole (241) opened 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.