JP3637409B2 - Sensor base - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sensor base for detachably mounting a sensor head of a sensor for detecting smoke and heat.
[0002]
[Prior art]
The sensor is composed of a sensor base that is fixed to the ceiling surface and a sensor head that is detachably attached to the sensor base. The sensor base is fixed to the ceiling surface in advance, and the sensor head is fixed according to the sensor base. Turn in the direction to connect the two.
[0003]
In addition, the sensor connects a wire connected to a fire receiver or the like to a blade-shaped connection terminal of the sensor base, but conventionally, a wire connection terminal is manufactured separately from the blade-shaped connection terminal. The electric wires were connected via the electric wire connecting terminals.
[0004]
In such a case, two types of parts, a blade-shaped connecting terminal and a separate electric wire connecting terminal, must be manufactured as current-carrying members, and can be assembled to the sensor base. However, there is a problem that it takes time.
[0005]
In order to improve this point, the present inventor first bent this with a single metal plate, and integrally formed the blade-like connecting terminal portion and the wire connecting terminal portion, and connected with the wire connecting terminal. The sensor which solved the above-mentioned problem was devised by using the connecting terminal as a terminal.
[0006]
The sensor is as disclosed in Japanese Patent Laid-Open No. 9-153188, and this will be briefly described with reference to FIGS.
[0007]
13 is a bottom view of the sensor base, FIG. 14 is a cross-sectional view taken along the line DD in FIG. 13, FIG. 15 is a bottom view of the connecting terminal with wire connection terminals, and FIG. 16 is a front view of the sensor head.
[0008]
In the figure, 100 is a sensor base, 101 is a wire lead-in hole, 102 is a mounting screw insertion hole formed by connecting a circumferential long hole 103, and 104 is inserted when the connection terminal of the sensor head described later is engaged. A circumferentially elongated elongate concave portion 105 is a concave portion for accommodating a wire connecting terminal portion of a connecting terminal with a wire connecting terminal described later. Reference numeral 106 denotes a small hole for screwing the set screw 107.
[0009]
108 and 109 are connecting terminals with electric wire connecting terminals. The former is the one in which the protruding direction of the connecting terminal and the inserting direction of the electric wire into the electric wire connecting terminal coincide with each other, and the latter is the right angle. .
[0010]
Here, the former connection terminal 108 with a wire connection terminal is demonstrated. The connecting terminal is formed by bending a single metal plate to form a U-shaped portion 108a and a blade-like portion 108b extending perpendicularly from the bottom 108a 'of the U-shaped portion 108a. The wire connection terminal is used, and the blade-shaped portion 108b is used as a connection terminal.
[0011]
Further, a screw insertion hole 108b 'is formed in the blade-like portion 108b near the base, and a hole 108b "into which a small protrusion in the connecting terminal of the sensor head, which will be described later, is inserted in the substantially central portion. A terminal spring 110 is housed in the U-shaped section 108a, and the terminal spring 110 is formed by bending one spring plate into a letter shape at one end and into an S shape at the other end. In addition, 110a is a C-shaped part and 110b is an S-shaped part.
[0012]
The U-shaped section 108a is covered with a terminal plate 112 so that the wire insertion hole 111 is in the same direction as the blade-shaped section 108b. Reference numeral 113 denotes a sensor head, and 114 denotes a connection terminal of the sensor head. Reference numeral 115 denotes a small protrusion of the connecting terminal 114. The small projections 115 are fitted into the holes of the blade-like portions of the connection terminals of the sensor base and locked.
[0013]
Thus, when inserting the core _{L 1} of the electric wire L from the wire insertion hole 111 of the terminal plate 112, the core wire _{L 1} is as electric wire connection terminal by the action of the pin spring 110 into contact with the portion 108a of the U-shaped cross section of the connecting terminals 108 The blade-like portion 108b that is pressed and thereby constitutes the connecting terminal is electrically connected to the electric wire via the portion 108a having a U-shaped cross section.
[0014]
[Problems to be solved by the invention]
A sensor configured in this way can sufficiently achieve the original purpose. However, it has also been found that there are some points that need to be improved in use. The first point is that two types (108, 109) of connecting terminals with wire connecting terminals are required as described above. It will lead to up.
[0015]
That is, in the case of a sensor base based on the sensor, if it is configured only by the same connection terminal 108 as shown by a chain line in FIG. 13, adjacent connection terminals collide with each other, which is impossible in space. For this reason, two types are necessarily required, one in which the protruding direction of the connecting terminal and the direction in which the electric wire is inserted into the electric wire connecting terminal coincide with each other.
[0016]
The second point is that the connecting terminal with the wire connecting terminal is fastened with one of the set screws 107, so that the fixing is not sufficient. Since it is stable, the blade-like part is easily bent in the direction in which the sensor head is inserted and removed during the connecting operation.
[0017]
The third point is that the connecting terminal is manufactured by die-cutting with a mold, so that burrs are generated on the entire edge and folded from the tip of the blade-like part. For this reason, the burrs on the side edges of the blade-like part are obstacles when connecting the sensor head from the side.
[0018]
That is, when the sensor head 113 is connected to the sensor base 100, a small protrusion 115 at the connection terminal 114 of the sensor head 113 is generated at the edge of the blade-like portion of the connection terminals 108 and 109 of the sensor base 100. It is caught in a burr (not shown) and cannot be connected smoothly, and in the worst case, the connecting terminal may be damaged.
[0019]
The present invention improves such a point, further reduces the cost and increases the overall strength of the connection terminal to prevent the bending of the blade-like portion, and further smoothly connects the sensor head to the sensor base. It is intended to provide a sensor base that can be used.
[0020]
[Means for Solving the Problems]
Therefore, the gist of the present invention is that a sensor base to which a sensor head is detachably attached is bent by a single metal plate as a current-carrying member fixed to the sensor base. A terminal having a wire connection terminal, which is integrally formed with a box-shaped part that is open to one end serving as a wire connection terminal, and a blade-shaped part that is a connection terminal extending therefrom. the use, the connecting terminals with electric wires connecting terminals, the tip of the blade-like portion, one to affix the sensitive knowledge unit base and secured by means of screws or the like, the parts of the box-shaped, it wires Protrusions or recesses are provided on both sides of the terminal cover so that the insertion hole is in the same direction as the blade-shaped part, and the sensor base is elastic and has opposing surfaces on both sides of the terminal cover. Protrusion or recess provided The locking piece provided with a recess or projection for engagement conflict set, that no such fixed sensitive knowledge unit base by fitting the projection or recess of the terminal cover in a recess or projection of said engaging piece It is in the featured sensor base.
[ 0021 ]
Further, the blade-like portion of the connecting terminal with electric wire connecting terminal may be folded and overlapped from the portion of the sensor head that contacts the connecting terminal during the connecting operation.
[ 0022 ]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a bottom view of a sensor base according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a plan view of the sensor base, and FIG. FIG. 5 is a cross-sectional view taken along line BB in FIG. 4, FIG. 6 is a front view of a connecting terminal with a wire connection terminal, FIG. 7 is a left side view thereof, FIG. FIG. 10 is a cross-sectional view taken along the line CC in FIG. 9, FIG. 11 is a bottom view thereof, and FIG. 12 is a plan view of the developed state.
[ 0023 ]
1 is a sensor base, 2 is an electric wire drawing hole, 3 is an insertion hole of a mounting screw formed by connecting a circumferential long hole 4, and 5 is a connection terminal of a sensor head (not shown). It is the elongate recessed part of the circumferential direction which penetrates.
[ 0024 ]
Reference numerals 6 and 6 denote locking pieces which are provided opposite to each other inside the concave portion 5 in the sensor base 1. The locking pieces 6 and 6 and protrusions or recesses provided on both side portions on the wire connection terminal side of the connection terminal with wire connection terminal to be described later constitute a fitting locking means, and the wire connection terminal in the connection terminal with wire connection terminal The side is fixed to the sensor base. Further, the locking pieces 6 and 6 have elasticity, and are provided with concave portions 6a for fitting projections provided on both side portions on the side of the wire connection terminal in the connecting terminal with wire connection terminal described later on the opposing surface. Further, a portion 1a for fixing a connecting terminal with a wire connecting terminal, which will be described later, sandwiched between the locking pieces 6, 6 of the sensor base 1 is inclined so that the inner side becomes higher.
[ 0025 ]
Moreover, although this embodiment shows the case where the recesses 6a are provided in the locking pieces 6 and 6 and the protrusions are provided on the wire connection terminal side, this may be reversed.
[ 0026 ]
7 is a small hole which does not form a female screw provided on the outer side than the recess 5 in the sensor base 1, by screwing the screw 8 fixed to the small hole 7 and forms a screwed state. Further, the set screw 8 is used to fix the tip of the blade-like portion of the connecting terminal with a wire connecting terminal, which will be described later. In this embodiment, the fixing means using the set screw is shown, but other appropriate fixing means may be used.
[ 0027 ]
9 is a connection terminal with a wire connection terminal. The connecting terminal 9 with electric wire connecting terminal is a blade-shaped part that bends a single metal plate and extends from the bottom part 9a ′ of the box-shaped part 9a, one of which is opened at a slight angle from a right angle. The portion 9b is formed, the box-shaped portion 9a is used as a wire connection terminal, and the blade-shaped portion 9b is used as a connection terminal. In addition, the blade-like portion 9b is folded and overlapped from a portion on the side in contact with the connection terminal of the sensor head during the connection operation.
[ 0028 ]
Further, the blade-like portion 9b is provided with a screw insertion hole 9b 'through which the set screw 8 is inserted in the portion closer to the tip, and a hole into which a small protrusion in the connection terminal of the sensor head is fitted at a substantially central portion. 9b ″, and a box-shaped portion 9a has a terminal spring 10. The terminal spring 10 has a single spring plate, one end of which is shaped like a letter, and the other end. 10a is a C-shaped part, 10b is an S-shaped part, and the shape of the terminal spring 10 is limited to that of this embodiment. There is no need.
[ 0029 ]
The box-shaped portion 9a is covered with a terminal cover 12 so that the wire insertion hole 11 is in the same direction as the blade-shaped portion 9b. Further, the terminal cover 12 is provided with projections 12a and 12a that constitute fitting locking means with the locking pieces 6 and 6 on both sides. Furthermore, the lower end portion of the terminal cover 12 opposite to the blade-like portion 9b of the connecting terminal is notched obliquely.
[ 0030 ]
Thus, when inserting the core L ₁ of the electric wire L from wire insertion holes 11 of the terminal cover 12, the core wire L ₁ is pressed into contact with the box-shaped portion 9a of the wire connection with the terminal connection terminal 9 by the action of the pin spring 10 Thus, the blade-shaped portion 9b constituting the connecting terminal is electrically connected to the electric wire via the box-shaped portion 9a.
[ 0031 ]
And also a connecting terminal attached wire connection terminal, is fixed to the sensor base 1 by screws 8 to stop the tip of the blade-like portion 9b constituting the connecting terminals, the portion 9a of the box-shaped constituting the wire connecting terminal Since it is fixed to the sensor base 1 by being fixed by fitting locking means constituted by the locking pieces 6 and 6 provided on the sensor base 1 and the protrusions 12a and 12a of the terminal cover 12 , While improving the workability at the time of assembling the sensor base, it is possible to reduce the size of the connecting terminal to secure the space for arrangement, and to secure the necessary strength for the connecting operation of the sensor head.
[ 0032 ]
Further, since the blade-like portion 9b is folded and overlapped from the portion that contacts the connecting terminal of the sensor head during the connecting operation, when the connecting terminal of the sensor head is engaged with the blade-like portion 9b, In addition, it can be carried out smoothly without any problems caused by burrs.
[ 0033 ]
【The invention's effect】
Since the present invention has the configuration and operation as described above, it is possible to reduce the size of the connecting terminal with a wire connecting terminal with less protrusion to the rear portion, and to secure a space for arrangement. Therefore, even the same connection terminal can be installed adjacently, and it is sufficient to manufacture only one type of connection terminal.
[ 0034 ]
In addition, the connection terminal with the wire connection terminal is fixed to the sensor base by fixing the tip of the blade-shaped part to the sensor base and by fixing the box-shaped part side with the fitting locking means provided on the sensor base. Since it is fixed to the base, the strength is increased by double fixing, and the blade-like portion is not easily bent during the connecting operation.
[ 0035 ]
Also, if the blade-like portion of the connection terminal is folded and overlapped from the portion that contacts the connection terminal of the sensor head during the connection operation, the connection terminal of the sensor head is engaged with the blade-like portion. When doing so, it is possible to carry out smoothly without any trouble caused by burr.
[Brief description of the drawings]
FIG. 1 is a bottom view of a sensor base according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a plan view of a sensor base.
FIG. 4 is a bottom view of the sensor base in a state where a connecting terminal with a wire connecting terminal is mounted.
FIG. 5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a front view of a connecting terminal with a wire connecting terminal.
FIG. 7 is a left side view of a connecting terminal with a wire connecting terminal.
FIG. 8 is a right side view of a connecting terminal with a wire connecting terminal.
FIG. 9 is a plan view of a connecting terminal with a wire connecting terminal.
10 is a cross-sectional view taken along line CC in FIG. 9. FIG.
FIG. 11 is a bottom view of a connecting terminal with a wire connecting terminal.
FIG. 12 is a plan view of a developed state of a connecting terminal with a wire connecting terminal.
FIG. 13 is a bottom view of a sensor base in the sensor previously devised by the inventor.
14 is a cross-sectional view taken along line DD in FIG.
FIG. 15 is a bottom view of a connecting terminal with a wire connecting terminal.
FIG. 16 is a front view of a sensor head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sensor base 2 Wire drawing hole 5 Recessed part 6, 6 Locking piece as fitting means 8 Set screw 9 Connection terminal with wire connection terminal 9a Box-shaped portion 9b Blade-shaped portion 10 Terminal spring 11 Wire insertion hole 12 Terminal cover

Claims (2)

In the sensor base to which the sensor head is detachably attached, as a current-carrying member to be fixed to the sensor base, this is bent by a single metal plate and a terminal spring for pressing and fixing is provided, and a wire connection Using a connection terminal with a wire connection terminal formed integrally with a box-shaped part that opens one side as a terminal and a blade-like part that becomes a connection terminal extending therefrom, the connection terminal with a wire connection terminal is connected to a blade the distal portion shaped for partial, one to affix the sensitive knowledge unit base and secured by means of screws or the like, the parts of the box-shaped, it so that the wire insertion hole is blade-like portion in the same direction Protrusions or recesses are provided on both sides of the covered terminal cover, and the sensor base is provided with a recess or projection that has elasticity and is opposed to the projections or recesses provided on both sides of the terminal cover. The provided locking piece Detector base upright, characterized in that without such securing sensitive knowledge unit base by fitting the projection or recess of the terminal cover in a recess or projection of the engaging piece. 2. The sensor base according to claim 1 , wherein a blade-like portion of the connecting terminal with electric wire connecting terminal is folded and overlapped from a portion on the side contacting the connecting terminal of the sensor head during the connecting operation .

Images