JPH09207814A - Joist assembly metal fittings and joist assembly method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with machining such as hole drilling to that even an unskilled worker can perform the work easily and enable the common use in various trucks having different width of frame by mounting a horizontal joist which is put in such a manner that it crosses a longitudinal joist on the longitudinal joist. SOLUTION: A longitudinal joist 9 is put on two frames 11 in such a manner that its rising part 9a faces the inside of a car body. By fitting a recessed section 3a of a washer 3 into the rising part 9a of the longitudinal joist 9, a bolt 6 is tightened to crimp the washer 3 on a nut 2. At this time, since a slight clearance is produced between the nut 2 and the washer 3 due to a stepped part 3c, the recessed section 3a of the washer 3 is fitted into the rising part 9a of the longitudinal joist 9 securely in such a manner that it bites the rising part 9a thereof. Lastly, the longitudinal joist 9 and a frame 11 are fixed by a bolt in the shape of U character and a nut. Thus, since machining such as drilling many holes is unnecessary and the nut 2 is deviated and the bolt 6 is tightened merely so that the recessed section 3a of the washer 3 comes below the rising part 9a of the longitudinal joist 9, only one unskilled worker can perform the assembly work easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joist mounting bracket for fixing a joist at a lower portion of a carrier such as a truck, and a method of mounting the same.

[0002]

2. Description of the Related Art In a truck, in order to prevent a load from being directly applied to a truck and deformed, the truck is indirectly attached to a vehicle body via structural members called vertical joists and horizontal joists. In the general conventional example shown in FIG. 6, the carrier 10 is fixed to the frame 11 of the vehicle body in the following procedure. That is, the members with vertical joist and horizontal joist are loaded from the manufacturer. The spacer 12 is placed on the upper surface of the pair of left and right frames 11 of the vehicle body. A vertical joist 13 is placed on the upper surface of each spacer 12 in parallel with the frame 11. The horizontal joists 14 are placed at predetermined intervals so as to intersect the vertical joists 13. The vertical joist 13 and the joist mounting bracket and the horizontal joist 14 are punched. The vertical joist 13 and the horizontal joist 14 are connected by an L-shaped bracket 15 and bolts 16 and nuts 17. The vertical joist 13 is fixed to the frame 11 with U bolts and nuts (not shown).

[0003]

However, these operations cannot be performed by one person, and even a skilled person requires a certain amount of time. For example, in the case of the conventional example shown in FIG. 6, if a total of 16 horizontal joists are arranged on the vertical joist, a total of 128 holes of 16 × 4 × 2 are made in the vertical joist joist assembly and the horizontal joist. There must be. Moreover, it is necessary to take the double effort of first punching a punch to make a small temporary hole so that each hole does not shift, and then expanding to the main hole so as to match each hole of the L-shaped bracket. 25 in total
6 holes are required. In addition to this, the work of putting bolts with washers into all holes and tightening with nuts is added.

[0004] Although the number of parts is very large and the load carrier is fixed to the frame with great effort, the appearance of the bolt is exposed to the outside of the vehicle body, so that the appearance is extremely slim. . In addition, in the case of trucks of the same vehicle type, trucks made by other manufacturers have different widths of the two frames, so that the drilling locations must be changed. The present invention has been proposed in view of the above circumstances, and newly provides a joist mounting bracket that allows unskilled persons to easily perform work without the need for drilling and the like, and various trucks having different frame widths. It is an object of the present invention to provide a general purpose joist assembly metal fitting for each part and a joist assembly method that improves the mounting workability by making it possible to commonly use the fixture.

[0005]

In order to achieve this object, a joist mounting bracket according to the present invention attaches a horizontal joist placed so as to intersect a vertical joist to the vertical joist, and forms the joist on the bottom surface. The guide groove is hooked on the lip raised from the slit at the lower part of the horizontal joist, and the recess formed at the upper part of the side end is arranged below the nut so as to sandwich the lip of the horizontal joist. It is characterized by comprising a washer fitted to a raised portion formed on the upper inside of the vertical joist, and a bolt for crimping the washer to the nut. In addition, it is preferable to form a step on the contact surface on the side of the horizontal joist of the washer. In addition, in the joist assembling method using the joist assembling bracket according to the present invention, the guide groove of the nut is hung on the lip portion on at least a pair of vertical joists mounted on the frame such that the raised portions face inward. After the fixed horizontal joists are placed at predetermined intervals so that the slits face downward, the washers are crimped to the nuts with bolts while fitting the recesses of the washers into the protrusions of the vertical joists.

In the present invention, at first, the washer of the joist mounting bracket is loosened from the nut. In this state, the joist mounting bracket is moved along the slit to the intersection of the vertical joist and the horizontal joist according to the width of the frame of the vehicle body and the like. Then, by tightening the bolts of the joist mounting bracket at an appropriate position, the horizontal joist and the vertical joist are connected with one touch.

[0007]

FIG. 1 shows an embodiment of the present invention.
4 through FIG. This joist fitting 1
As shown in FIG. 1, a nut 2 movably hung in the longitudinal direction of the horizontal joist 8 so as not to fall off from the horizontal joist 8, and crimped to the nut 2 with a bolt 6 so as to fit with the vertical joist 9. The main configuration is a washer 3 to be used.

As shown in FIGS. 2A and 2B, the nut 2 has a flat rhombus shape in which two left and right surfaces 2c are narrower than two front and rear surfaces 2d. A female spiral 2a penetrating from the top surface to the bottom surface is formed at the center of the nut 2, and a pair of left and right guide grooves 2b are formed on the bottom surface in parallel with the female spiral 2a.

The washer 3 has a planar square shape as shown in FIGS. 3A and 3B, and a concave portion 3a to be fitted with a protruding portion 9a of a vertical joist 9 to be described later is provided on an upper side end of the washer 3. Are formed. A bolt hole 3b penetrating from the upper surface to the bottom surface is formed at the center of the washer 3, and a step 3c is formed at a position adjacent to the bolt hole 3b on the upper surface of the washer. In addition, it is preferable that the bottom surface of the washer 3 is configured to be substantially symmetrical with the upper surface of the washer 3. As shown in FIG. 1, the bolt 6 is screwed into the nut 2 from below the washer 3 via the washer 7, and the male spiral portion 6a is subjected to a locking process.

On the other hand, as shown in FIG.
A structural member (sub-frame) having an upper portion having a substantially T-shaped cross section and a lower portion having a substantially C-shaped cross section is used. A slit 8a for exposing the female spiral 2a of the nut 2 is formed at a lower portion of the lateral joist 8, and both ends of the slit 8a are slightly raised upward to form a lip portion 8b for positioning the nut 2.

As shown in FIG. 4, a structural member (sub-frame) having a U-shaped cross section is used for the vertical joist 9.
Protruding portions 9a facing each other are formed symmetrically on the inner upper part and the inner lower part of the vertical joist 9. The raised portion 9a
It may be partially raised at predetermined intervals, but in order to eliminate the concentrated stress applied to the washer 3, it is better that the area in contact with the washer 3 is large, and it is continuous from one end to the other end of the vertical joist 9. It is preferable to raise the protrusion. The shapes of the raised portion 9a and the concave portion 3a are substantially semicircular in cross section, but are not limited thereto, and may be designed in various shapes that can be fitted to each other.

Next, a method of attaching the vertical joist 9 and the lateral joist 8 to the vehicle body through the spacer 12 using the joist 1 will be described. Two frames 1
The vertical joists 9 are mounted on the respective components 1 so that the raised portions 9a face the inside of the vehicle body. The nut 2 is inserted into the lateral joist 8 from the lower surface, the guide groove 2b of the nut 2 is hooked on the lip portion 8b of the lateral joist 8, and the two left and right surfaces 2c are brought into contact with the inner wall of the lateral joist 8. A washer 3 is temporarily fixed to the nut 2 with a bolt 6 having a washer 7 to obtain a joist mounting bracket 1. Two of these joist mounting brackets 1 are attached to one horizontal joist 8, and are bridged at substantially equal intervals on the vertical joist 9 so that the slits 8 a of the horizontal joist 8 face downward.

In FIG. 4, as indicated by a two-dot chain line,
The bolt 6 is tightened and the washer 3 is crimped to the nut 2 while fitting the recess 3 a of the washer 3 into the raised portion 9 a of the vertical joist 9. At this time, a slight gap is formed between the nut 2 and the washer 3 by the step portion 3c.
a is securely fitted so as to bite into the raised portion 9 a of the vertical joist 9. Finally, the vertical joist 9 and the frame 11 are fixed with U-shaped bolts and nuts (not shown). As described above, according to the present embodiment, it is not necessary to form a large number of holes as in the conventional example, and the nut 2 is displaced so that the recess 3 a of the washer 3 is located below the raised portion 9 a of the vertical joist 9. Since it is only necessary to tighten the nut 6, even a non-skilled person can easily and quickly perform the joist assembling operation alone.

For example, in the case where 16 horizontal joists 8 are placed on the vertical joists 9 as in the prior art, the number of bolting steps is 16 × 2 = 32 as far as the connection between them is concerned.
Also, the number of parts used can be significantly reduced,
The weight of the vehicle can be reduced. Further, the nut 2 is hidden in the horizontal joist 8 and the washer 3 is hidden in the middle of the two vertical joists 9, so that the joist mounting bracket 1 cannot be seen from the outside, and the functional beauty is excellent.

Furthermore, since the upper surface and the lower surface of the washer 3 are formed substantially symmetrically, any surface can be used as the contact surface on the side of the horizontal joist 8, so that the mounting work can be quickly performed without considering the top and bottom of the parts. You can proceed. If the shape of one of the recesses 3a is configured to be fittable with the raised portion 9a of another shape, it can be dealt with only by turning over the washer 3 upside down, and there is no need to prepare another new washer 3. Further, if the bolts 6 are loosened, the vertical joist 9 and the horizontal joist 8 can be mounted very easily on other vehicles having different frame widths.

In addition, the nut 2 to be inserted into the lateral joist 8 is formed in a flat rhombus shape to increase the area of the nut 2 that comes into contact with the lateral joist 8, and no hole is formed in the joist mounting bracket and the lateral joist 8. As a result, the overall strength is greatly increased, and the horizontal joist 8 and the vertical joist 9 can be strongly connected. On the other hand, when the load exceeding the limit is applied to the vertical joist 9 joist mounting bracket and the horizontal joist 8, the distortion is more flexible than the conventional example (see FIG. 6) in which a large number of bolts 6 are fixed by the joist mounting bracket and the bracket. It is easy to be damaged because it can be accepted.

Although the guide groove 2b and the lip portion 8b are formed as a pair, they are not limited to this, and may be formed as a single piece. Further, the planar shape of the nut 2 and the joist and metal washer 3 are not limited to those in the above embodiment, and may be an elliptical shape or a triangular shape in addition to a square shape and a rectangular shape. As the vertical joist 9, an H-shaped vertical joist 19 shown in FIG. 5A, a square pipe type vertical joist 29 shown in FIG. 5B, or a substantially J-shaped vertical joist 39 shown in FIG. 5C can be used. . The protruding portions 9a may be formed only on the inner upper portions. Further, the locking may be performed not on the male screw of the bolt 6 but on the female screw 2 a of the nut 2.

[0018]

As described above, by using the joist mounting bracket according to the present invention, the number of bolts and nuts for fixing vertical joists, horizontal joists and the like can be greatly reduced. Since this joist mounting bracket is hidden inside the frame, it does not impair the appearance of the vehicle body. Further, by providing the step portion on the contact surface on the side of the horizontal joist of the washer, an effect is obtained that the concave portion is less likely to come off from the raised portion. Further, according to the joist assembling method using the joist assembling bracket, even when the body is mounted on a new chassis, that is, even when the frame width is different, the joist assembling bracket can be simply moved along the slit. . As a result, even non-skilled workers can easily and quickly attach the cargo bed to various vehicle bodies via the horizontal joist mounting bracket and vertical joist, greatly reducing the number of parts required for working labor. Thus, there is an effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partially enlarged perspective view of one embodiment of the present invention.

FIG. 2A is a front view of a nut used in the present embodiment,
(B) is the same bottom view.

FIG. 3A is a front view of a washer used in the present embodiment,
(B) is the same top view.

FIG. 4 is an enlarged cross-sectional view showing a method of assembling joists according to the present embodiment.

5 (a) to 5 (c) are cross-sectional views showing other embodiments of the vertical joist.

FIG. 6 is a perspective view showing an example of a conventional carrier mounting structure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 joist mounting bracket 2 nut 2 b guide groove 3 washer 3 a recess 3 c step 6 bolt 8 lateral joist 8 a slit 8 b lip 9 vertical joist 9 a ridge 10 carrier 11 frame

Claims (3)

[Claims] 1. A nut in which a vertical joist and a horizontal joist are arranged and assembled so as to intersect each other, and a guide groove formed on the bottom surface is hooked to a lip portion raised from a slit below the lateral joist. And, it is placed under the nut so as to sandwich the lip of the horizontal joist,
And a washer in which a concave portion formed on the upper side end is fitted to a raised portion formed on an inner upper portion of the vertical joist; and a bolt for crimping the washer to the nut. Mounting bracket. 2. The joist assembly according to claim 1, wherein a step is formed on the contact surface of the washer on the lateral joist side. 3. A horizontal joist in which a guide groove of a nut is hooked on a lip portion on at least a pair of vertical joists mounted on a frame such that the protruding portion faces inward so that the slit faces downward. The joist mounting method using the joist mounting bracket according to claim 1 or 2, wherein after mounting at predetermined intervals, the washer is crimped to the nut with a bolt while fitting the recess of the washer into the raised portion of the vertical joist.