JPH0728506Y2 - Duct corner fittings - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corner connecting fitting for a duct used for building air conditioning, exhaust, smoke exhaust and the like.

[0002]

2. Description of the Related Art When connecting and connecting a plurality of ducts of this kind in a communicating state, connecting flanges that continuously and integrally project from the rectangular opening edge portions of the adjacent ducts,
It is known that not only are they joined through airtight packing, but also one corner bolt is pierced through the corner connection fittings attached to the four corners of both joint flanges, and these are fixed by tightening the corner nuts. Is.

In this case, instead of the above-mentioned joining flange of the integral body continuously protruding from the opening edge portion of the duct, a joining flange of another body is inserted into the opening edge portion of the duct so as to be freely detachable and insertable. Joining flanges,
In addition, by joining a joint flange of the integral body and a joint flange of a separate body, the corner portions of the adjacent ducts are connected and fixed by the same means as described above. Also, as the above-mentioned corner connecting metal fittings, products such as those shown in FIGS.

That is, the conventional corner connecting fitting is made of a relatively thin tin plate having a thickness of about 0.8 to 1.0 mm and is extended while maintaining a crossing angle of about 90 degrees from the corner plate piece (1). It is pressed into an overall L-shape including a pair of blade plate pieces (2) that are formed, and especially the protruding corner edge and the entering corner edge are strip-shaped ribs (3) (4) for reinforcement, Only a fixed amount (w) is bent and raised continuously and integrally to the front side, and a through hole (5) for receiving a bolt is burred in almost the center of the corner plate piece (1).

[0005]

However, in such a structure, the square bolt (6) penetrating the through hole (5) is formed.
When tightening the fastening nut (7) with a tool such as an electric wrench, the square bolt (6) will rotate together with the nut (7), so that the nut can be tightened quickly and firmly. Can not. Therefore, insufficient tightening often occurs.

Therefore, the operator holds the head of the square bolt (6) with a fingertip of one hand wearing gloves so as not to idle, and operates the electric wrench held by the remaining one hand to operate the corner nut. Although (7) is actually tightened up, this is not only extremely troublesome in terms of work, but also very dangerous.

Particularly, in the above corner connecting fitting, the head side of the square bolt (6) and the square nut (7) are formed on the ribs (3) and (4) due to the fact that the generally flat back side is fitted to the joint flange. Therefore, the one hand that holds the head of the bolt (6) above does not necessarily touch the bent and raised edges of the ribs (3) and (4). It becomes a crossing insertion state. Therefore, if the head of the bolt (6) is rotated even a little, one hand of the bolt (6) inevitably comes into contact with the bent and raised edges of the ribs (3) and (4) and is injured by the cut edge. It may happen that the gloves you wear are bitten.

Further, in the case of connecting a long duct having a large opening diameter, the bolt receiving through holes (5) of the adjacent corner connecting fittings are easily misaligned with each other. Since it is difficult, the bolt (6) cannot be easily penetrated into the through hole (5). This is because the configuration that serves as a clue for the centering adjustment operation is not provided to the corner connecting fitting itself.

[0009]

SUMMARY OF THE INVENTION The present invention is intended to improve such a problem, and for that purpose, the adjacent corner portions of a duct having a quadrangular structure are provided with one square bolt and its fastening nut. As a flat metal plate-made connecting fitting used for connection and fixing by means of a connecting plate, firstly, a corner plate piece facing a notched corner portion of a joint flange integrally projected from an opening edge portion of the duct, and a joint flange of the joint flange. A pair of vane plate pieces extending from the corner plate piece at an intersecting angle of about 90 degrees so that the corner plate piece can be fitted to the rear side, and a through hole for receiving a bolt is provided at a substantially central portion of the corner plate piece. An opening is formed, and at least a pair of anti-rotation projections that can engage with the head of the square bolt or the square nut are provided in the peripheral portion of the through hole so as to project, and the duck adjacent to the peripheral portion of the convex portion. The bolt should match the receiving through hole comrades, characterized in that the through hole for operation tool receiving an opening formed in,

Secondly, a corner plate piece facing the adjacent open corner portion of the joining flange inserted into the opening edge portion of the duct so as to be freely inserted and removed, and the corner so as to be inserted into the hollow inside of the joining flange. 9 from the plate piece
A pair of vane plate pieces extended while maintaining a crossing angle of 0 degree, a through hole for receiving a bolt is formed in an approximately central portion of the corner plate piece, and the square bolt is formed around the through hole. At least a pair of anti-rotation projections that can engage with the heads or corner nuts of the same are projected, and the above-mentioned bolt receiving through holes of the ducts adjacent to the periphery of the projections should be aligned. It is characterized in that a through hole for receiving a tool is formed.

[0011]

According to the above-mentioned structure of the present invention, in any case, the corner connecting fitting is stamped and formed from a flat steel plate into a generally L-shape having a corner plate piece and a pair of blade plate pieces. In the peripheral portion of the bolt receiving through hole that is opened at the substantially central portion of the corner plate piece, at least a pair of anti-rotation projections that can engage with the head portion or the square nut of the square bolt are provided in a protruding manner. Since it has been
There is no risk of the square bolt and the square nut spinning around when connecting and fixing the adjacent corners of the duct by tightening the square nut for fastening and tightening the square nut for fastening. The connection work can be done quickly and safely, and the connection state will be extremely firm and stable.

A through hole for receiving an operating tool, which should be aligned with the through hole for receiving the bolt of the adjacent duct, is also formed in the periphery of the protrusion for preventing rotation which protrudes from the corner plate piece. Therefore, for example, when connecting a long duct with a large opening diameter, the bolt receiving through holes of the corner connecting metal fittings do not match, and it may be difficult to penetrate the square bolts. Even if so, by inserting an appropriate rod or other operation tool into the through hole for receiving the operation tool and correcting the movement of adjacent ducts by relatively twisting them, the through holes for receiving the bolts can be easily combined. Since they can be matched, the workability in adjusting the centering is also excellent.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described in detail below with reference to the drawings. First, FIGS. 1 to 9 show a corner connecting fitting (A) according to the first embodiment. As will be described later, this is a product that is used by fitting it to a joint flange that projects continuously from the opening edge of a rectangular duct so that it can be fitted from behind, and is more rigid than the conventional products of FIGS. Using a hardened flat steel sheet having a constant thickness of about 2.6 to 3.0 mm as a raw material, it is punched into a substantially L-shape or an angle shape as a whole.

That is, in FIGS. 1 to 6 in which the above-mentioned corner connection fitting (A) is extracted, (11) is a corner plate piece thereof, which has a square shape of, for example, about 34.2 × 34.2 mm, and A pair of blade plates (12) from two sides
Is a relational state in which the crossing angle (α) is approximately 90 degrees,
It is continuously dispatched for a length of about 70 mm. The width of both blade plate pieces (12) is dimensioned to about 32 mm, which is slightly smaller than one side of the corner plate piece (11).
Therefore, the corner plate piece (11) and both blade plate pieces (12)
The boundary part between and is set as a stopper step part (13) of about 2.2 mm located at the corner of the corner connecting fitting (A) itself. Further, the flat plate surface of the corner plate piece (11) is projected more than that of both blade plate pieces (12) so as to be recessed to the back side by a constant depth (t) of about 1 mm.

Further, a through hole (14) for receiving a bolt is punched and opened at a substantially central portion of the corner plate piece (11). (15) is a pair of anti-rotation protrusions that are located at the periphery of the through hole (14) and are also protruded from the flat plate surface of the corner plate piece (11) to the front side by a constant height (h). It is a child, centering on the bisector (Y-Y) of the intersection angle (α) in both blade plate pieces (12),
The bolts are distributed in a symmetrical manner with the through holes (14) for receiving the bolts sandwiched therebetween.

Further, the both convexes (15) are formed in a cylindrical shape, and engage with the head of the square bolt or the square nut which will be described later, so that the square bolt and the square nut rotate together. You can prevent that. In that case,
The protruding height (h) of the two convex elements (15) is preferably sized to be about 1 mm, which corresponds to the above-mentioned depression depth (t) of the corner plate piece (11).

Further, (16) is a pair of operating tool receiving through holes punched and opened in the corner plate piece (11) in the peripheral portion of the biconvex (15), and also the crossing angle (α). ) Is distributed and arranged in a symmetrical form centering on the bisector (Y-Y). This is because, for example, when connecting and fixing adjacent ones of a long duct having a large opening diameter, the bolt receiving through holes (14) of the corner connecting fittings (A) are misaligned. In this case, an appropriate rod or other operating tool (not shown) is inserted into the operating tool receiving through hole (16), and the adjacent ducts are moved and straightened so as to be so-called, so that the bolt receiving through hole is inserted. The holes (14) are aligned with each other to ensure that the bolt can pass through.

On the other hand, the extension tips of both vane plate pieces (12) are bent out to the front side by a height of about 2.4 mm as a bent piece portion (17) for preventing rattling that closely adheres to the joint flange of the duct. There is. (18) is also a blade plate piece (12)
It is a plurality of ribs that are located in the middle part of the flat plate and are also protruded from the flat plate surface to the front side by a height of about 2.4 mm. It also has a rattling prevention function.

In this respect, in the figure, a pair of ribs (18) located at the projecting edges of both blade plates (12) and a pair of ribs (18) also located at the entering corner edges are arranged in a staggered arrangement. Although it is scattered in the state, a plurality of them are both blade plate pieces (1
Bisection line (Y-Y) of the intersection angle (α) in 2)
Any number other than those shown in the figure may be adopted as long as they are distributed symmetrically with respect to the center, and a fixed width is maintained on the longitudinal center line (XX) of both blade plate pieces (12). It does not matter even if it is protruded and processed as the length of.

Next, FIGS. 10 to 18 show a corner connecting fitting (B) according to a second embodiment of the present invention, which is separately inserted into the opening edge of the duct as will be described later. It is a product that is used by inserting it into the joint flange of the body from the lateral direction, and has the following configuration that is slightly different from the corner connecting fitting (A) of the first embodiment from that meaning.

That is, in the corner connecting fitting (B) of the second embodiment, as is clear from FIGS. 10 to 15, the corner plate piece (11a) is slightly larger than that of the first embodiment and is about 50.2 ×. It is in the form of a 50.2 mm square, and its entering corner edge is cut out as an arc concave curved surface portion (19). Moreover, the flat plate surface of the corner plate piece (11a) is L-shaped with a constant band width and has a depth (t) of about 1 mm.
It is projected so that it will sink to the back side only.

A pair of blade plate pieces (12a) are continuously extended from the corner plate piece (11a) for a length of about 50 mm while maintaining a crossing angle (β) of about 90 degrees. At the boundary between the blade plate pieces (12a) and the corner plate pieces (11a), the corner connecting fittings (B) are provided.
Although the stopper step (13a) facing the edge of the projecting corner of itself is also provided, in relation to the large size of the corner plate piece (11a) as described above, the entering corner of the corner connecting fitting (B) is provided. Another stop step on the edge (13
b), the corner plate piece (11a) and both blade plate pieces (1
It is provided at the boundary with 2a).

Further, the extension tips of both blade plate pieces (12a) are formed in a tapered state so that they can be smoothly inserted into the hollow groove of the joining flange. (18
a) is a rib for reinforcing and preventing rattling that is protruded from the middle part of both blade plate pieces (12a) to the front side, but this is different from that of the first embodiment, both blade plate pieces (12a).
Along the longitudinal center line (XX) of the.

Similarly, (20) is a punch hole punched and opened at the base ends of both vane plate pieces (12a), and there is a retaining projection protruding from a corresponding portion of a joint flange described later. It will be locked. Due to the locking action, the joining flange and the corner connecting fitting (B) inserted into the joining flange are integrated so as not to be detachable.

Since the other structure of the second embodiment is substantially the same as that of the first embodiment, the structure shown in FIG.
Although only the corresponding symbols in FIGS. 1 to 9 are described in 0 to 18 and their detailed description is omitted, any corner connecting fittings (A) and (B) have zinc flats or other Is subjected to an appropriate surface treatment. Further, the two types of corner connecting fittings (A) and (B) are both the above-mentioned bisector (Y-
It is also clear from the figure that the sheet is pressed symmetrically around Y).

The above-mentioned corner connecting fitting (A) of the first embodiment is fitted to the joint flange (21) which integrally projects from the opening edge of the rectangular duct (D) in a state of fitting from behind. Will be used.

That is, the joint flange (21), which is integral with the duct (D), continuously extends outward from the opening edge of the duct (D) as suggested from FIGS. It is folded back into a channel-shaped cross section, and its corner position is opened as an L-shaped notched corner portion (22).

Therefore, as is clear from FIGS.
Both blade plate pieces (12) of the corner connection fitting (A) are inserted into the channel groove (23) of the joint flange (21) that intersects at a substantially right angle through the cutout corner portion (22).
It is operated from the back by elastically fitting. Then, the stopper step portion (13) facing the projected corner edge of the corner connecting fitting (A) is locked and restricted by the notched end edge portion of the joining flange (21), and as a result, the connecting fitting (A). Only the corner plate piece (11) in () is kept in a state of being properly exposed to the cutout corner portion (22).

At this time, the extended tips of both blade plate pieces (12) are bent out as bent piece portions (17), and ribs (18) are also provided in the middle of both blade plate pieces (12). Because it is protruded, it is only that corner connection fitting (A)
As it were, it became thicker and consequently the joint flange (21)
In combination with the elasticity, the connecting metal fitting (A) firmly and closely fits into the channel groove (23), and a stable state where the rattling does not occur can be achieved.

On the other hand, the corner connecting fitting (B) of the second embodiment described above has a hollow inside of the joint flange (21a) which is detachably inserted and fixed to the opening edge of the rectangular duct (D). It will be used by inserting from the side.

That is, as apparent from FIGS. 16 to 18, the joint flange (21a) which is a separate member from the duct (D) is folded and polymerized from a single metal plate into an angled cross section, The right side is used as a beak (24) for insertion into the duct (D), and is fixed so that the opening edge of the duct (D) can be clamped, while the remaining other side is a corner connecting fitting (B). Hollow groove (23a) for receiving
And the other side forming the hollow groove (23a) is in the duct (D) in the fixed state of being inserted into the duct (D).
It is designed to project from the outside.

In the case of the second embodiment, as suggested from FIG. 16, the joint flange (21a) is the duct (D).
Since they are independent from each other, when they are inserted and fixed in the duct (D), an L-shape corresponding to the corner position of the duct (D) is provided between the joint flanges (21a) intersecting at substantially right angles. This results in the definition of open corners (22a) of the mould, which corresponds to the notched corners (22) of the first embodiment.

Therefore, as is clear from FIGS. 19 to 26, the hollow grooves (23) of the two joint flanges (21a) intersecting with each other are formed.
The two blade plate pieces (12a) of the corner connection fitting (B) are slid into the inside of a) so as to be elastically inserted from the lateral direction. Then, the stopper step portions (13a) (13b) located at the projecting edge and the entering corner edge of the corner connecting fitting (B) are both joined flange (21).
The punch hole (20) opened in both blade plate pieces (12a) of the connecting metal fitting (B) is locked from the separated edge portion of a) from the corresponding position of the joint flange (21a). As a result, the protrusions (25) for retaining inwardly protruding are also self-locked, and as a result, only the corner plate piece (11a) in the connection fitting (B) is attached to the open corner portion (22a). After all, it is kept properly exposed.

In this case, since the extended tip portions of both blade plate pieces (12a) are formed in a tapered state, the inserting operation of the joint flange (21a) into the hollow groove (23a) can be carried out smoothly, and in spite of that. Without both blades (12
Since the rib (18a) is also protruded from the middle portion of a), the joint flange (21a) has elasticity, and thus the connecting metal fitting (B) is provided in the hollow groove (23a). The result is a tight fit and a stable storage without rattling.

In FIGS. 19 to 26 mentioned above, two types of the corner connecting fittings (A) of the first embodiment and the corner connecting fittings (B) of the second embodiment are described for the sake of convenience. The combined use shows that the adjacent corner portions of the duct (D) are connected and fixed to each other, but the corner connecting fitting (A) of the first embodiment is connected to one of the joint flanges (21).
And the other joint flange (21
When the corner connecting fitting (B) of the second embodiment is inserted into a) as described above, the bolt receiving through holes opened in the corner plate pieces (11) (11a) of both connecting fittings (A) and (B). Since (14) and (14a) are in self-conformity communication with each other, the through holes (14) and (14)
One square bolt (26) may be passed through a), and the fastening nut (27) may be tightened with a tool such as an electric wrench. Then, the mutually adjacent ducts (D) are instantly connected and fixed.

In this case, as also suggested by FIGS. 19 to 26, in any of the corner connecting fittings (A) and (B), the detents (15) (15a) for preventing the rotation thereof are in a state of protruding to the front side. There is a head (2) of the square bolt (26) on the non-rotating protrusion (15) protruding from one of the two types.
8) is also a protrusion (15)
Since the square nuts (27) are engaged with each other in (a), there is no fear that the square bolts (26) and the square nuts (27) will idle together, and the tightening work will be quick and light. The workability and safety are remarkably excellent.

In this respect, just in case, the square bolt (2
Since the head (28) and the corner nut (27) of 6) are both engaged with the convex element (15) (15a), it may theoretically seem that it cannot be operated by tightening the convex element. If the projecting height (h) of the child (15) (15a) is set to a low value of about 1 mm as described above, or if it is formed into a columnar shape, it is considered that the instantaneous operation is completed by the electric wrench. Together, the head of the square bolt (26) (2
8) or the corner nuts (27) ensure that the projections (15) (15)
As it goes over a), it will be sunk and fixed.

Further, for example, when the duct (D) is a long product having a large opening diameter, its corner connection fitting (A).
Although the through holes (14), (14a) for receiving bolts, which open in the corner plate pieces (11), (11a) of (B), are easily displaced, it is difficult to penetrate the bolts (26) therethrough. The corner plate piece (11) of any of the above-mentioned corner connecting fittings (A) and (B)
A through hole (16) for receiving an operation tool is provided in (11a).
Since (16a) is formed with an opening, by inserting an appropriate rod or other operating tool here and correcting the movement of adjacent ducts (D) by relatively twisting them,
The bolt receiving through holes (14) (14a) can be centered and adjusted.

At this time, if at least a pair of the operation tool receiving through holes (16) (16a) is distributed to the peripheral portion sandwiching the bolt receiving through holes (14) (14a) as shown in the figure, the above operation is performed. It can be said that it is effective in the sense that the through holes (16) and (16a) that are easier to insert can be selectively used in the work of straightening with a tool, and the workability can be further improved.

FIGS. 27 and 28 show various modifications of the connection and fixing state corresponding to FIG. 22, but as is apparent from both figures, only the corner connecting fitting (A) of the first embodiment is used. , The adjacent corners of the duct (D) are connected and fixed, or the corners of the duct (D) are connected and fixed by using only the corner connecting fitting (B) of the second embodiment. Of course, it is possible. The other reference numeral (29) is an airtight packing.

[0041]

As described above, according to the present invention, the adjacent corner portions of the rectangular duct (D) are connected and fixed by one square bolt (26) and the fastening nut (27). A corner plate piece (11) facing the notched corner portion (22) of the joint flange (21) integrally projected from the opening edge portion of the duct (D) as the flat metal plate connection fitting (A) to be used. And its corner plate piece (11) so that it can be fitted behind the joining flange (21).
And a pair of vane plate pieces (12) extended while maintaining a crossing angle (α) of about 90 degrees from the corner plate piece (1
A through hole (14) for receiving a bolt is provided at approximately the center of 1).
At least one pair of anti-rotation protrusions (15) that can engage with the head (28) or the corner nut (27) of the square bolt (26) at the periphery of the through hole (14). And a through hole (16) for receiving an operation tool, through which the above-mentioned bolt receiving through hole (14) of the duct (D) adjacent to the peripheral portion of the projection (15) should be aligned. 29-31 because it has been formed
Based on the above, there is an effect that all the problems of the prior art described can be improved.

That is, in the substantially central portion of the corner plate piece (11) forming the corner connection fitting (A) of the present invention, a through hole (14) for receiving a square bolt (26) similar to the conventional product is formed.
Although an opening is formed, a square bolt (2
Since at least one pair of protrusions (15) for preventing rotation which can be engaged with the head (28) or the corner nut (27) of 6) are projected, the corner nut (27) is used as an electric wrench or the like. Tighten with the tool of the adjacent duct (D)
When connecting and fixing the corners of each other, it is not necessary to hold down the head (28) of the bolt (26) so that it does not run idle, therefore it is possible to perform a safe, reliable, and quick connection work, and to prevent its tightening from becoming insufficient. Since there is no possibility of occurrence, an extremely stable and robust connection and fixed state can be obtained.

Further, when connecting a long duct (D) having a large opening diameter, the through hole (14) for receiving the bolt is often provided between adjacent ducts (D). Although it is easy to shift the position and it is difficult to penetrate the bolt (26) through this, the corner connecting fitting (A) of the present invention has the above-mentioned anti-rotation protrusion (15).
A through hole (1) for receiving an operation tool, which is to be matched with a through hole (14) for receiving the bolt, around the periphery of the
Since 6) is also formed as an opening, a rod or other appropriate operating tool is inserted into this to straighten and move the adjacent ducts (D) so that the adjacent ducts (D) are relatively straightened. 14) can be easily matched, and the connection work of the duct (D) can be performed easily and efficiently.

The above-mentioned various effects can be achieved in the same manner even in the corner connecting fitting (B) having the structure of claim 3. The connection fitting (B) is a product which is used by inserting it laterally into the hollow groove (23a) corresponding to the joint flange (21a) which is a separate body from the duct (D). This is because the structure of the main part of the and the 雖 is substantially the same as that of the corner connecting fitting (A).

In particular, if the configuration of claim 2 is adopted,
Not only the corner connecting metal fitting (A) itself can be strengthened more and more, but also the bent piece parts (17) and ribs (18) of both vane plate pieces (12) project from the duct (D). Rattling with the flange (21) is effectively prevented, and there is an effect that the degree of adhesion and stability of the fitted state with respect to the channel (23) can be further enhanced.

Further, if the configuration of claim 4 is adopted,
Both vane plate pieces (12a) of the above-mentioned corner connection fitting (B) can be more smoothly inserted into the hollow groove (23a) of the joining flange (21a), and nevertheless, once inserted, , Both blades (12a)
The ribs (18a) effectively prevent rattling with the joint flange (21a), and the retaining projections (25) of the joint flange (21) open on both blade plate pieces (12a). The punch (20) is self-locking, so there is no danger of separation, so the duct (D)
The connection state of can be more firmly and stably maintained.

[Brief description of drawings]

FIG. 1 is a perspective view of a corner connection fitting according to a first embodiment of the present invention as viewed from the front side.

FIG. 2 is a perspective view seen from the back side of FIG.

FIG. 3 is a front view of the corner connecting fitting.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

6 is a sectional view taken along line 6-6 of FIG.

FIG. 7 is an exploded front view showing an arrangement relationship of a corner connecting fitting with respect to a joint flange of a duct.

FIG. 8 is a front view showing the fitting state of the corner connecting fitting to the joint flange.

FIG. 9 is a rear view seen from the back side of FIG.

FIG. 10 is a perspective view of a corner connecting fitting according to a second embodiment of the present invention as viewed from the front side.

11 is a perspective view seen from the back side of FIG.

FIG. 12 is a front view of the corner connecting fitting.

13 is a sectional view taken along line 13-13 of FIG.

14 is a sectional view taken along line 14-14 of FIG.

FIG. 15 is a sectional view taken along line 15-15 of FIG.

FIG. 16 is an exploded front view showing the positional relationship of the corner connecting fittings with respect to the joint flange of the duct.

FIG. 17 is a front view showing a state where the corner connecting fitting is also inserted into the joint flange.

18 is a rear view seen from the back side of FIG.

FIG. 19 is a perspective view of the corner connecting fitting of the first embodiment and the corner connecting fitting of the second embodiment used in combination, with the ducts connected, viewed from the front side.

20 is a perspective view seen from the back side of FIG.

FIG. 21 is a front view of FIG.

22 is a sectional view taken along line 22-22 of FIG.

23 is a sectional view taken along line 23-23 of FIG.

24 is a sectional view taken along line 24-24 of FIG.

FIG. 25 is a front view of FIG. 20.

26 is a sectional view taken along line 26-26 of FIG. 25.

FIG. 27 is a cross-sectional view showing a modified usage state corresponding to FIG. 22.

FIG. 28 is a cross-sectional view showing another modified example of the usage state corresponding to FIG. 22.

29 is a perspective view of the conventional product viewed from the front side corresponding to FIG. 1. FIG.

30 is a perspective view seen from the back side of FIG. 29. FIG.

FIG. 31 is a sectional view showing a fastening state of a conventional product corresponding to FIG. 23.

[Explanation of reference signs] (11) · · Corner plate piece (11a) · Corner plate piece (12) · · Blade plate piece (12a) · Blade plate piece (14) · · Bolt receiving through hole (14a) · Bolt Receiving through-hole (15) · · Detent for preventing rotation (15a) · Detent for preventing rotation (16) · · Through hole for receiving operation tool (16a) · Through hole for receiving operation tool (17) · · Folding Bent piece (18) ・ ・ Rib (18a) ・ Rib (20) ・ ・ Punch hole (21) ・ ・ Joint flange (21a) ・ Joint flange (22) ・ ・ Notched corner (22a) ・ Open corner (23) ··· Channel groove (23a) · Hollow groove (25) · · Locking protrusion (26) · · Square bolt (27) · · Square nut (28) · · Head (A) ... Corner connection fitting (B) ・ ・ ・ Corner connection Ingredients (D) · · · duct (alpha) · · · intersection angle (beta) · · · intersection angle (Y-Y) · bisector

Claims (4)

[Scope of utility model registration request] 1. A flat metal plate fitting for use in connecting and fixing adjacent corners of a rectangular duct (D) with one square bolt (26) and its fastening nut (27). As A), a corner plate piece (11) facing the notched corner portion (22) of the joint flange (21) integrally projected from the opening edge portion of the duct (D), and the joint flange (21). And a pair of blade plate pieces (12) extended from the corner plate piece (11) at an intersection angle (α) of about 90 degrees so that the corner plate piece (11) can be fitted to the back of the corner plate piece (11). ), A through hole (14) for receiving a bolt is formed in an approximately central portion of the square bolt, and the square bolt (26) is formed around the through hole (14).
At least a pair of anti-rotation projections (15) that can engage with the head (28) or the corner nut (27) of the projection are provided so as to project, and adjacent ducts () are formed around the projections (15). A duct corner connection fitting characterized in that an operation tool receiving through hole (16) for matching the bolt receiving through hole (14) of D) is formed. 2. A bent piece portion (17) for preventing rattling of extension ends of both blade plate pieces (12) with a joint flange (21).
A corner connecting fitting for a duct according to claim 1, characterized in that a rib (18) for preventing rattling and for reinforcing is provided in a protruding manner in the middle of both vane plate pieces (12). 3. A flat metal plate fitting used for connecting and fixing adjacent corner portions of a rectangular duct (D) with one square bolt (26) and its fastening nut (27). As B), the corner plate piece (11a) facing the adjacent open corner portion (22a) of the joint flange (21a) inserted into the opening edge of the duct (D) so as to be freely inserted and removed, and the joint flange (21a). A pair of blade plate pieces (12) extended from the corner plate pieces (11a) at an intersecting angle (β) of about 90 degrees so that they can be inserted into the hollow inside of the blade plate pieces (12).
a), a through hole (14a) for receiving a bolt is formed at an approximately central portion of the corner plate piece (11a), and the square bolt (2) is formed around the through hole (14a).
6) At least a pair of anti-rotation projections (15a) that can engage with the head (28) or the corner nut (27) of the projection (6) are provided in a protruding manner, and adjacent to the periphery of the projection (15a). Duct (D)
The above-mentioned bolt receiving through hole (14a) is formed with an operation tool receiving through hole (16a) for matching the same with each other. 4. An extended front end portion of both blade plate pieces (12a) is formed in a tapered state, and a punch hole (20) with a joint flange (21a) is also formed at a base end portion of both blade plate pieces (12a). And a rib (18) for preventing rattling and reinforcement with the joint flange (21a) in the middle of both blade plate pieces (12a).
The corner connecting fitting for a duct according to claim 3, wherein a) is provided so as to project.