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[ EN ]


1. Field of the Invention
The present invention provides a method for fabricating an improved board anchor, the board anchor affixing an object to a wall or board.

2. Description of the Prior Art
Conventional prior art board anchors consist of a shaft section, an anchor section affixed to one edge of the shaft and a screw section formed at the other end of the shaft. When affixing an object to a board, the shaft section is inserted through a hole bored through one side of a wall, while the anchor section is in flush contact with the wall. On the other side of the wall, the board is placed against the wall so that the shaft is inserted into the screw hole in the board, and the board is pressed and anchored to the wall by tightening a nut attached to the screw section.
Although various techniques have been available to fabricate the prior art board anchors, the fabrication techniques tend to be labor intensive and thus relatively costly.
What is desired is to provide a technique for fabricating a unique board anchor which is less costly than the techniques currently available.

The present invention provides a method for fabricating an improved anchor board. The anchor board comprises an anchor section having a screw section, an attachment, or reverse, ring and a plate spring. The anchor section, preferably formed by stamping, is U-shaped and comprises two vertically extending leg members and a base member having an opening formed therein. Each vertically extending arm member has adjustment holes formed therein. The ring member, formed by stamping, is, in the preferred embodiment, curved and has two protrusions formed along its circumference. The formed anchor section is positioned on a mold, the protrusions on the ring inserted into the adjustment holes in the anchor section arms and a force is applied to the ring. The force substantially flattens the ring, securing the ring to the anchor section. Threads are then tapped through the aligned holes in the ring member and the screw section of the anchor section . A formed plate spring is then attached to the anchor section.
In a second fabrication technique, one leg member of the anchor section is formed at an angle to the longitudinal axis of the section, one of the ring member protrusions being inserted into a corresponding adjustment hole formed on the anchor section arm member. The angled arm member is then forced towards the longitudinal axis in a manner such that the other ring member protrusion is inserted into the corresponding adjustment hole of the leg member, securing the ring member to the anchor section. The tapped openings are formed as set forth hereinabove and the plate spring then attached to the anchor section.
The present invention thus provides a efficient and relatively inexpensive technique for fabricating a board anchor.

For a better understanding of the present invention as well as other objects and further features thereof, reference is made to the following description which is to be read in conjunction with the accompanying drawing wherein:

Figure 1 is a front elevation view of the board anchor fabricated by the method of the present invention;
Figure 2 is a bottom perspective view of the anchor section portion of the board anchor shown in Figure 1 ;
Figure 3 is a perspective view of a formed anchor section;
Figure 4 is a perspective view of a formed ring member;
Figure 5 is a perspective view of a formed plate spring;
Figure 6 illustrates the insertion of the anchor section of Figure 1 into a mold machine and the insertion of the ring member into the anchor section holes;
Figure 7 illustrates the machine upper mold in position to act on the lower mold;
Figure 8 illustrates the lower mold after the stamping process is completed;
Figure 9 illustrates the process of tapping threads in the ring member and the hole in the anchor section protrusion;
Figure 10 illustrates the step of adding the plate spring to the anchor section; and
Figures 11(a) and 11(b) illustrate a second embodiment for securing the ring member to the anchor section.

Referring now to Figures 1 and 2, the basic components of the anchor board 13 of the present invention comprise anchor section 2, attachment ring 8 and spring 3. The details of the board anchor fabricated in accordance with the teachings of the present invention is disclosed in Japanese Patent Application No. 2000-238503, filed August 7, 2000.
Anchor board 13 is equipped with screw shaft 1, freely movable, U, or rectangularly, shaped anchor section 2 connected via attachment ring 8 to screw shaft 1, plate spring 3, (a pressure device that re-positions anchor section 2 to a 90 degree crosswise position to screw shaft 1 from a position parallel with the shaft), and a mechanism 4 which stops the anchor section 2 at the cross position. Attachment ring 8 is screwed onto end section la of screw shaft 1.
Anchor section 2 has a screw section 2a, scew section 2a extending from the upper surface of anchor section 2, where screw shaft 1 is inserted. As shown in Figure 2, screw section 2a of anchor section 2 incorporates a screw hole 9 that fits screw shaft 1 in an open position. Also, end section 2b of anchor section 2 has plate spring 3 clamped on with the force of the spring strength. Anchor section 2 has leg, or flange, sections 2c, 2c with trapezoid shaped extensions 6, 6 to fit in the inner circumference of a wall insertion hole (not shown). Flat plate protrusions, or trunnions, 8a, 8a are formed on attachment ring 8 and adjustment holes 7, 7 are formed on extensions 6, 6 of anchor section 2. Protrusions formed within adjustment holes 7,7 are shaped to restrict the rotation of attachment ring 8 against anchor section 2 and cause trunnions 8a, 8a to stop anchor section 2 in a correct position. The stopper mechanism 4 (Fig. 1) is comprised of the trunnions 8a, 8a of attachment ring 8 and adjustment holes 7, 7 of anchor section 2.
Plate spring 3 is clamped onto edge section 2b of anchor section 2 by the force of the spring.
The following sets forth the technique for fabricating the improved board anchor of the present invention.
Anchor section 2 (Figure 3) and attachment ring 8 (Figure 4) are fabricated by a stamping process; spring 3 (Figure 5) is fabricated by forming. The stamping and forming processes are conventional. Attachment ring 8, in a first embodiment, is stamped in a curved shaped as illustrated in order to enable the protrusions around its circumference to be inserted into the openings formed in the legs of the anchor section 2 as will be set forth hereinafter.
A machine which can be operated manually and has an upper mold 20 and a lower mold 22 exemplifies a fabrication device that can be used in the fabrication of anchor section 2. In particular, and as shown in Figure 6 and 1, anchor section 2, after fabrication, is inserted into lower mold 22. The curved attachment ring 8, after fabrication, is inserted into the adjustment holes 7,7 formed in the anchor section arms 2c. The upper mold 20 is then lowered in the direction of the arrow into contact with ring 8, the resultant force flattening ring 8 and securing ring 8 to the anchor section 2 as shown in Figure 8.
The assembled anchor part 28 is then positioned on tapping installation mold 30 as shown in Figure 9 in a manner such that the opening 32 formed in attachment ring 8 is aligned with the opening in anchor screw section 2. A tapping device 34 is used to form aligned and continuous threads in anchor screw section 2 and attachment ring 8 (a support device, not shown, is utilized to hold the ring 8 in place during the tapping process so that the thread formed therein is aligned with the thread formed in anchor part 28; this enables shaft 1 (fixing bolt) to smoothly screw in through ring 8 and anchor part 28 and function as required). After the tapping step, spring 3 is then mounted to anchor section 2 as shown in Figure 10, resulting in the basic components of the board anchor 13 of the present invention.

In a second embodiment as shown representatively in Figures 11(a) and 11(b), one of the leg members T of anchor section 2 has been formed at an angle to the longitudinal axis 40 of the anchor section 2. The ring member 8 is then positioned such that the protrusion on one side of the ring member 8 is inserted into the adjustment hole on leg member 7. A force is then applied to leg member T such that the other protrusion on the ring member 8 is inserted through the adjustment hole in leg member T as shown in Figure 11 (b). This process secures the ring member 8 to the anchor section 2. The thread tapping process and the plate spring addition is identical to the process described hereinabove.
The present invention thus provides a relatively simple and cost efficient anchor board fabrication technique and in particular, wherein aligned threads in the ring and anchor part are formed easily with a minimum of process steps.
While the invention has been described with reference to its preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its essential teachings.