JP2003347762A - Door spring retaining mechanism in box provided with door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring retaining mechanism for a door in a box provided with a door, having a function of holding the door in an open position with a predetermined angle using a single spring and a function of opening the door slightly when unlocked. <P>SOLUTION: An opening in a box body 1 can be opened when a door 2 is opened. This makes the box provided with a door. A spring receiver portion 13 is provided inside the box body 1. A bent flat spring 3 having a first bent spring portion 31 on an upper end thereof and a second bent spring portion 32 on a lower end thereof is assembled into the spring receiver portion 13. The side of the door 2 has the following arrangements. Specifically, there is provided an inwardly facing first spring contact portion 23 that holds the door 2 in an open position, as it is driven back by the first bent spring portion 31 of the bent flat spring 3 when the door 2 is opened to a predetermined opening angle. There is also provided a second spring contact portion 25 located slightly inwardly the first spring contact portion 23. The second spring contact portion 25 protrudes a lower edge of the door 2 from a lower edge of the opening in the box body 1, while being driven back at all times by the second bent spring portion 32 of the bent flat spring 3 to unlock the door 2 when the door 2 is locked. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box for storing electrical equipment and a box with various doors, wherein the door can be kept open at a predetermined opening angle. And a mechanism for holding the door open.

[0002]

2. Description of the Related Art In a box with a door, such as a box for storing electrical equipment for a distribution board, the opening of which is hinged to the upper side thereof and can be opened and closed by a door which opens horizontally, the box is horizontal or lower. It is preferable that the door that has been opened as described above can be kept in the open state. For this reason, a spring receiving portion is provided in the box body, and a spring is incorporated in the spring receiving portion so that the door can be held in a predetermined open state by the elastic force of the spring. In the above-described box with a door, when the lock is released to open the door, the tip of the door is projected to be slightly opened so that the door opening operation can be easily performed. In some cases, a weak spring that resiliently opens the door in the locked state is incorporated so that when the lock is released, the door is flipped up to a slightly open state. When the door can be held in a predetermined open state by the spring force of the spring as described above, if a weak spring that springs in the direction in which the door is always opened in the locked state is to be incorporated, two types of springs are used. Has to be incorporated in each of the spring receiving portions, and the number of spring points increases, resulting in some problems such as an increase in cost.

[0003]

The object of the present invention is to solve the above-mentioned conventional problems and to solve the problem that one kind of spring has a function of holding a door in a predetermined open state and a lock. A door spring holding mechanism in a box with a door, in which the number of parts is reduced by providing both a function of resiliently opening the door when opened and a single spring receiving portion. Is to provide.

[0004]

A door spring holding mechanism in a box with a door according to the present invention which solves the above-mentioned problem has a door in which an opening of a box body can be freely opened and closed by a hinged door on an upper side thereof. In the box, a spring receiving portion is provided at a rear portion of the hinge portion of the door in the box body, and the upper end of the spring receiving portion is formed in the first bending spring portion and the lower end is formed in the second bending spring portion. Incorporating the bent leaf spring, on the upper side of the door corresponding to the above-mentioned spring receiving portion,
When the door is opened at a predetermined opening angle, the first of the bent leaf springs
A first inward spring contact portion which is resiliently held by the bending spring portion and holds the door in an open state, and a second bending spring of a bent leaf spring which is located slightly inside and is in a closed state where the door is locked. And a second spring contact portion for projecting the lower edge of the door from the lower edge of the opening of the box at the same time as the lock is released by being constantly repelled by the portion.
In the above-described invention, compared to a spring force for holding a door opened at a predetermined door opening angle in this door opening state,
When the locked door is opened, the spring force for slightly popping it up may be small, so that the spring force of the second bending spring portion is made smaller than that of the first bending spring portion. According to the second aspect of the present invention, when the spring force of the second bending spring portion is smaller than that of the first bending spring portion,
The width of the effective spring portion of the bending spring portion may be narrower than the width of the effective spring portion of the first bending spring portion. To reduce the width of the effective spring portion, a slit provided in the leaf spring material is used. The width of the effective spring portion of the second bending spring portion is made narrower than the effective spring portion width of the first bending spring portion, thereby reducing the spring force of the second bending spring portion as compared with the first bending spring portion. Further, a positioning projection is provided on the spring receiving portion, and the extension of the slit of the leaf spring material is engaged with the positioning projection to position the bending spring. This is the invention of claim 4.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As a preferred embodiment of the present invention, an electric power supply for a distribution board as shown in the drawing, in which an opening of a box body is hinged to the upper side and can be opened and closed by a door which opens horizontally. The equipment storage box will be described. 1 is a box body composed of a box body 11 and a frame-shaped cover 12 fitted to the opening side thereof, and 2 is hinged to a bearing formed above the opening of the box body 1 with a pin 21. Door that can be opened and closed horizontally.
A spring receiving portion 13 having a U-shaped cross section is provided between the above-mentioned bearing portions on the rear inner surface of the hinge connecting portion.

On the other hand, an outer surface of the upper part of the door 2 corresponding to the above-mentioned spring receiving portion 13 is provided with a first spring contact surface 2.
2, an inward eaves edge as the first spring contact portion 23;
An inward eaves portion as a second spring contact portion 25, which is located slightly inside the first spring contact portion 23 and whose tip is a spring contact edge 24, is provided at a required interval therebetween. I have.

Reference numeral 3 denotes a bent leaf spring which is mounted and mounted on the spring receiving portion 13. The bent spring 3 is formed by bending a single leaf spring material into a substantially C shape and forming the same into a substantially C shape. ,
A first bend that abuts the upper end of the door 2 on a predetermined door opening angle, for example, when the door 2 is opened substantially horizontally, and abuts the first spring contact surface 22 to resiliently hold the door 2 in a substantially horizontal door open state; The door 2 is formed in the spring portion 31 and abuts against the above-mentioned second spring contact portion 24 of the door 2 in the closed state, the lower end of which is locked. At the same time, the lower edge of the door 2 is flipped up to form a second bent spring portion 32 which works so that the lower edge of the door 2 projects slightly forward from the lower edge of the opening of the cover 12 which is the opening of the box 1. It was done.

The spring force of the second bending spring portion 32 is as follows:
Since the spring force of the first bent spring portion 31 that holds the door 2 in the open state may be smaller than that of the first bent spring portion 31, the second bent spring portion 32 is provided with a wide slit 33 in the illustrated example, while the first bent portion is provided. The spring portion 31 is provided with a slit 34 narrower than the slit 33. In order to achieve this object, the width of the effective spring portion of the second bending spring portion 32 is set to the first bending spring. Since it is sufficient that the width of the effective spring portion of the portion 31 is smaller than the width of the effective spring portion of the first bent spring portion 31 by another means without providing a slit. It is also possible to adjust the magnitude of the spring force by changing the number of slits of equal width, but those in which slits are provided and the width of the effective spring portion is adjusted, The sliding surface of can be widely taken as a surface without slit. Runode, more preferable because the it can long life. Further, the slit 34 of the first bending spring portion 31 in the illustrated example extends this to the linear plate portion 35 between the first bending spring portion 31 and the second bending spring portion 32, and this is extended to the spring receiving portion 13 The bent leaf springs 3 can be positioned and firmly attached by engaging with the positioning projections 14 provided in the above.

In the drawing, reference numeral 26 denotes the first spring contact surface 2.
The spring stopper portion 36 formed on the outer surface of the end portion of the second 2
The tip portion of the bending spring portion 31 is a contact portion bent and formed in a shape corresponding to the stopper portion 26 described above.

With this configuration, the second bent spring portion at the lower end of the bent leaf spring 3 that is in contact with the second spring contact portion 25 of the door 2 when the door is locked and the door is closed. Although the door 32 is in a state of being opened in the direction of opening the door 2, the door 2 is unlocked to open the door 2 and at the same time, the lower edge of the door 2 is opened by the elastic force of the second bending spring portion 32. The lower edge of the door 2
Can be easily opened. When the door 2 is opened at a predetermined opening angle, the first bent spring portion formed at the upper end of the bent leaf spring 3 incorporated in the spring receiving portion 13 provided on the inner surface of the box 1. 31 comes into contact with the first spring contact surface 22 of the outer surface of the first spring contact portion 23 provided on the upper side of the opened door 2, and the spring force of the door 2 causes the door 2 to be opened while the door 2 is in the open state. Is kept open at a predetermined door opening angle.

In addition, as described above, the door 2 is resiliently held in the open state in which the door 2 is opened at a predetermined opening angle, and the locked door 2 is resiliently opened in the opening direction. The door 2 is unlocked and the lower edge of the door 2 is
The function of allowing the cover 12 to slightly protrude from the lower edge of the opening, which is the opening, of the cover 12 includes the first bent spring portions 31 at the upper and lower ends of one bent leaf spring 3 formed of one leaf spring material.
And the second bent spring portion 32. Since the bent leaf spring 3 is incorporated into one spring receiving portion 13, the number of spring points may be small and a plurality of spring receiving portions need to be provided. Therefore, the number of steps in manufacturing and parts management can be reduced.

[0012]

As apparent from the above description, the present invention provides:
One type of bent leaf spring having a first bent spring portion at the upper end and a second bent spring portion 32 at the lower end has a function of holding the door in a predetermined open state and a slight opening of the door when the lock is released. It has both functions of resilient so that it is open to the open state, so the number of parts is reduced, the number of spring receiving parts is reduced, the structure of the box can be simplified, and the cost can be reduced. . Therefore, the present invention greatly contributes to the industry as a solution to the problem of the conventional door spring holding mechanism in this type of box with a door.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a main part in a door closed state according to a preferred embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a main part showing a preferred embodiment of the present invention when a door is unlocked.

FIG. 3 is a partial cross-sectional view of a main part of the preferred embodiment of the present invention in an open state.

FIG. 4 is a front view showing another embodiment of the spring receiving portion according to the present invention.

FIG. 5 is a perspective view showing a preferred embodiment of a bent leaf spring used in the present invention.

FIG. 6 is a front view showing the entirety of a preferred embodiment of the present invention.

FIG. 7 is a side view showing the entirety of a preferred embodiment of the present invention.

[Explanation of symbols]

1 box 11 Cover 13 Spring support 2 door 21 pin 22 First spring contact surface 23 1st spring contact part 24 Spring rest 25 2nd spring contact part 3 Bending leaf spring 31 1st bending spring part 32 Second bending spring 33 Wide slit 34 Narrow slit

Claims (4)

[Claims] 1. A box with a door, wherein the opening of the box body can be freely opened and closed by a door hinged on the upper side thereof.
A spring receiving portion is provided in the box body. The spring receiving portion incorporates a bent leaf spring whose upper end is formed in the first bent spring portion and whose lower end is formed in the second bent spring portion, while the upper side of the door is mounted. At a position corresponding to the above-mentioned spring receiving portion, when the door is opened at a predetermined opening angle, the first inwardly bent spring portion of the bent leaf spring resiliently holds the door in the open state. When the door is locked, the first spring contact portion is slightly resilient and is always resiliently released by the second bent spring portion of the bent leaf spring when the door is locked. A door spring holding mechanism in a box with a door, further comprising a second spring contact portion projecting from a lower edge of an opening of the box. 2. A door spring holding mechanism in a box with a door according to claim 1, wherein the spring force of the second bending spring portion is smaller than that of the first bending spring portion. 3. The method according to claim 2, wherein the second width is determined by a slit width provided in the leaf spring material.
The width of the effective spring portion of the bending spring portion is smaller than the width of the effective spring portion of the first bending spring portion, and the spring force of the second bending spring portion is smaller than that of the first bending spring portion. 3. A door spring holding mechanism in the box with a door according to 2. 4. The door according to claim 3, wherein a positioning projection is provided on the spring receiving portion, and the extension of the slit of the leaf spring material is engaged with the positioning projection to position the bending spring. Spring retaining mechanism for the door in the box.