JPS632310Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tightening tool such as a board anchor.

Board anchors are used as a means of attaching various devices to hollow walls and ceilings where screws or nails cannot be used directly. As a tool for fixing this board anchor to a wall or ceiling, a lever is pivoted to the frame body, an outer cylinder is attached to the tip of the frame body, and a tension case is pivoted to the tip of the lever. This tension case is inserted into the outer cylinder, and by reciprocating the lever relative to the frame body, the tension case is reciprocated in the outer cylinder in a linear direction. A device with a retractable head is used. However, in this known tensioning tool, when the lever is rotated relative to the frame body, the pivot shaft of the tension case moves on an arc centered on the pivot shaft between the frame body and the lever. Therefore, the tension case inserted into the outer cylinder does not move along the axis of the outer cylinder, but reciprocates in the axial direction at an angle to the axis of the outer cylinder. Therefore, in order to avoid interference between the two, a gap must be provided between the outer cylinder and the tension case according to the inclination of the tension case, but this gap should be made larger as the stroke of the tension case becomes larger. There is a need. When the gap is increased in this way, the tension case can reciprocate smoothly, but when the head of the board anchor tightening screw is engaged with the tip of the tension case, the tension case shakes and work efficiency becomes worse. Disadvantages arise, and when the lever is rotated to pull the board anchor tensioning screw, the tension case may move in its radial direction, causing the screw head to disengage from the tip of the tension case.

This invention was made in order to eliminate the above-mentioned drawbacks of the known tensioning tools, and is designed to allow the tensioning case disposed inside the outer cylinder to move in a straight state along its axial direction. The present invention aims to provide a tensioning tool such as a board anchor that has good workability by reducing the gap between the outer cylinder and the tensioning case and reducing looseness between the outer cylinder and the tensioning case.

Embodiments of the present invention will be specifically described below with reference to the drawings.

First, a first embodiment of the present invention shown in FIGS. 1 to 9 will be described. In the figure, reference numeral 1 denotes a frame body having a U-shaped cross-sectional shape, and is made up of a pair of side walls 3, 3 extending upward in parallel from both longitudinal edges of a bottom portion 2 having a rectangular planar shape. . The side walls 3, 3 are formed low at the base end of the frame body 1, and high at the distal end. A grip 4 made of synthetic resin is attached to the base end of the frame body 1, and serves as a gripping portion. Further, a pair of guide elongated holes 5, 5 extending in the vertical direction are formed at opposing positions of the side walls 3, 3 at the tip, and these guide elongated holes 5, 5 are connected to the tension case 31, which will be described later. Pivot pin 33
It is for guiding both ends of the. A circular hole 6 is further bored in the bottom 2 of the leading end of the frame body 1, and an outer cylinder 7 extending downward is fixed to the periphery of the circular hole 6 on the lower surface of the bottom 2. The outer cylinder 7 has a side opening 8 formed by cutting a portion of the circumferential side in the axial direction at its lower end, through which the head of the board anchor tightening screw can pass. There is. Further, a flange 9 extends radially inward from the lower end of the outer cylinder 7. Note that reference numerals 10 and 10 are through holes bored in the side walls 3 and 3 closer to the front end than the center of the frame body 1, and a spring fixing pin 11 is inserted into these through holes 10 and 10.
The spring 12 is held by inserting the spring 12 therethrough.

Reference numeral 21 denotes a lever having an inverted U-shaped cross section, the base end of which is a lever to which a grip 22 similar to that of the frame body 1 is attached, and a side wall extending in the vertical direction at the distal end thereof. 2
3 and 23 are provided with insertion holes 24 and 24 for a pivot pin 33 of a tension case 31, which will be described later. Further, on the lower edges of the side walls 23, 23 near the tips, there are first protrusions 25, 25 and second protrusions 26, which are arranged at a predetermined interval.
26 are formed, but these protrusions 25, 2
Reference numerals 5, 26, and 26 are portions that become the first fulcrum and the second fulcrum, respectively, when the lever 21 rotates relative to the arm body 1 and pulls up the tension case. Further, relatively large diameter stop holes 27, 27 are provided in the portions of the side walls 23, 23 closer to the tips than the center, and by inserting the spring fixing pin 11 into the stop holes 27, 27, the frame can be fixed. This prevents the lever 21 from separating from the main body 1, and also allows the maximum range in which the lever 1 can be expanded to be determined.

Reference numeral 31 denotes a cylindrical tension case, which has an insertion hole 32 for a pivot pin 33 at its upper end. By inserting the attachment pin 33 into each of the insertion holes 24, 24, 32, and 32, it is pivotally attached to the tip of the lever 21. A flange-shaped engagement jaw 34 extends radially inward from the lower end of the tension case 31, and a flange-shaped engagement jaw 34 is formed at the lower end of the tension case 31 by cutting a portion of its peripheral side in the axial direction. A lateral opening 35 is formed through which the head of the board anchor tensioning screw passes and the underside of the screw head engages with the engaging jaw 34.

41 is a retaining device for the pivot pin 33;
It has a cylindrical main body 42 that fits into the head of the tension case 31 and has a flange 43 extending radially outward from its upper end. This flange 43 pulls the main body 42 onto the case 3.
This is a part that comes into contact with the upper edge of the tension case 31 when it is inserted into the tension case 1 and acts as a stopper. Subject 4
2 is formed with a through hole 44 that penetrates in the radial direction, and when the retaining device 41 is fitted into the head of the tension case 31, the through hole 44 is inserted into the tension case 31.
It is formed at a position communicating with the insertion hole 32 provided in the. An engaging member holding hole 45 extending in the axial direction is bored from the lower surface of the main body 42, and this engaging member holding hole 45 communicates with the through hole 44, and the peripheral side wall thereof is connected to the through hole 44. protrudes radially inward in the form of a flange, and its diameter becomes slightly smaller. An engaging member made of a steel ball 46 and a spring 47 are sequentially inserted into the engaging member holding hole 45 , and then a bolt 48 is screwed into the lower part of the holding hole 45 . As a result, the steel ball 46 is urged upward by the spring 47 and is held in the holding hole 45 with its tip protruding into the through hole 44 . On the other hand, a groove 49 having an arcuate cross section is provided around the center of the pivot pin 35 .

Next, the procedure for assembling a tensioning tool such as the board anchor described above will be explained. First, the retaining device 41 is fitted into the head of the tensioning case 31. Next, the tension case 31 is inserted halfway into the outer cylinder 7 of the frame body 1, and the side wall 2 at the tip of the lever 21 is inserted.
3 and 23 are arranged on both sides of the head of the tension case 31,
Insert the pivot pin 33 into the elongated guide holes 5, 5 of the frame body 1, the insertion holes 24, 24 of the lever 21, the insertion holes 32, 32 of the tension case 31, and the through hole 44 of the retaining device 41, respectively. The tension case 31 is pivotally attached to the tip of the lever 21 by the lever 21.
Note that the pivot pin 33 is inserted into the through hole 44 of the retaining device 41.
When the steel ball 46 is inserted into the holding hole 45, the tip of the steel ball 46 is pressed against the circumferential wall of the pivot pin 33 and sinks into the holding hole 45, but the groove 49 of the pivot pin 33 is located at the location where the steel ball 46 is disposed. When it reaches this point, it protrudes upward due to the force of the spring 47, makes a fitting sound, and fits into the groove 49. As a result, the pivot pin 33 is prevented from slipping out in any axial direction. In this state, both ends of the pivot pin 33 are fitted into the guide slots 5, 5, and are guided to move only in the vertical direction by the guide slots 5, 5. Become.

Then, the spring fixing pin 11 is inserted into the through holes 10, 10 of the frame body 1 and the stop holes 27, 27 of the lever 21, respectively, and the spring 12 is supported by the spring fixing pin 11, and the frame body 1 and the lever 21 are The tightening tool is assembled by interposing it between the

Next, a procedure for attaching the board anchor to the board using the above-mentioned tightening tool will be explained. First, before the board anchor is attached to the tension case 31, the lever 21 is pushed up entirely by the spring 12 as shown in FIG. , 5, and a spring fixing pin 11
are in contact with the lower portions of the stop holes 27, 27, respectively. When the head of the anchor board tightening screw is to be engaged with the tension case 31, the lever 21 is slightly expanded as shown in FIG. Lower the tension case 31 using the contact part as a fulcrum, and with the tension case 31 pulled down the most, insert the head B of the anchor board tightening screw A into each opening of the outer cylinder 7 and the tension case 31, as shown in FIG. 8 and 35 to engage the engagement jaws 34 of the tension case 31. In this state, the protrusions 25, 25, 26, 26 provided on the lever 21 are not in contact with the bottom 2 of the frame body 1. Next, hold the frame body 1 and the lever 21, and
Rotate 1. Lever 21 is initially attached to pivot pin 3
3, but as shown in FIG.
5 and 25 serve as fulcrums, and the rotation of the lever 21 allows the tension case 31 to be pulled up via the pivot pin 33. Note that in this state, the protrusion 2
The contact portion between 5 and 25 and the bottom portion 2, that is, the fulcrum, is not kept in a fixed position, but slides toward the front as the lever 21 rotates. When the tension case 31 is pulled up and the legs D of the board anchor C are bent to some extent, the front and rear protrusions 25, 25, 2 as shown in FIG.
6 and 26 are both in contact with the bottom part 2.
After this, as shown in Fig. 9, the protrusions 26, 26 on the rear side
serves as a branch to further pull up the tension case 31 and further bend the leg portions D of the board anchor C to complete the installation.

The first embodiment of the present invention has been described above, and as described above, the guide elongated holes 5, 5 are formed in the side walls 3, 3 of the frame main body 1.
By fitting the end of the pivot pin 33 of the tension case 31 into the inside of the tension case 31 and making the fulcrum of the rotating lever 21 movable with respect to the frame body 1, the tension case 31 can be moved along the axial direction of the outer cylinder 7. Since it can be pulled up in a straight state, the gap between the outer cylinder 7 and the tension case 31 can be reduced. Therefore, workability becomes extremely good. Furthermore, when tightening a board anchor, the stroke may be small until the leg D is bent, but a large pulling force is required; on the other hand, once the leg D is bent, the pulling force may be small. However, in the tightening tool of the above embodiment, the protrusions 25, 2 on the front side are initially
5 serves as a fulcrum, a large tensile force can be obtained even if the stroke is small, and after the leg D has been bent to a certain extent, the protrusions 26 and 26 on the rear side serve as fulcrums, so a large stroke can be obtained even if the tensile force is small. It is more preferable because the pulling force and stroke change ideally during the tightening operation as obtained.

Next, a second embodiment of the present invention is shown in FIGS. 10 to 13, which differs from the front protrusions 25, 25 and the rear protrusion 26 in the first embodiment. 26 and each end thereof is continuous in a smooth curved shape, and the other parts are constructed in the same manner as in the first embodiment. This tightening tool has exactly the same effect as the previous embodiment, but in addition, as shown in FIGS. 11 to 13, the fulcrum moves continuously during the tightening operation, so it is more efficient in terms of workability. It becomes something.

Although the two embodiments have been described above, in these embodiments, the frame body of the lever 21 is moved by rotating the lever 21 in a lever manner without pivotally connecting the frame body 1 and the lever 21. Although the fulcrum for the lever 21 is provided movably, the means for making the fulcrum of the lever 21 movable is not limited to the above. That is, as shown in FIGS. 14 to 17, the frame body 1 and the lever 21 are pivotally connected, and the pivot hole 51 of the lever 21 is connected to the lever pivot pin 5.
By forming the lever 2 to have a larger diameter than that of the lever 2,
The fulcrum can be moved along with the rotation of 1. This is because, as shown in FIGS. 15 to 17, the contact area between the lever pivot pin 52 serving as a fulcrum and the pivot hole 51 of the lever 21 changes sequentially during the tightening operation.

As described in detail above, the tensioning tool such as a board anchor of the present invention has guide elongated holes 5, 5 formed in the side walls 3, 3 of the frame body 1, and a tension case 31 formed in the guide elongated holes 5, 5. The tension case 3 is characterized in that the end of the pivot pin 33 of the lever 21 is fitted so that the fulcrum of the lever 21 relative to the frame body 1 can be moved as the lever 21 rotates.
1 can be pulled up while keeping it in a straight position along the axial direction of the outer cylinder 7, so the gap between the outer cylinder 7 and the tension case 31 can be reduced.
Therefore, it is possible to provide a tightening tool such as a board anchor that has less rattling between the two and has good workability.

[Brief explanation of the drawing]

1 to 9 are diagrams showing a first embodiment of the present invention, FIG. 1 is an exploded perspective view thereof, FIG. 2 is a side view, and FIG. 3 is an enlarged cross section taken along the line - in FIG. 2. Figures 4 to 9 are central vertical cross-sectional views of essential parts showing the operating state of the tightening tool when installing a board anchor, and Figures 10 to 13 are views showing a second embodiment of the present invention. Fig. 10 is an exploded perspective view, Figs. 11 to 13 are central longitudinal cross-sectional views of the main parts showing the operating state of the tightening tool when installing a board anchor, and Figs. FIG. 14 is an exploded perspective view, and FIGS. 15 to 17 are views showing the operating state of the tightening tool when installing the board anchor. Explanation of symbols, 1...Frame body, 3...Side wall, 5...Elongated hole for guide, 7...Outer cylinder, 21...
Lever, 31... tension case, 33... pivot pin.

Claims (1)

[Scope of utility model registration request] A frame body 1, an outer cylinder 7 attached to the tip of the frame body 1, a lever 21 rotatably arranged with respect to the frame body 1, and a pivot pin 33 attached to the tip of the lever 21. It consists of a tension case 31 which is pivotally connected and inserted into the outer cylinder 7,
In a tensioning tool such as a board anchor that reciprocates a tension case 31 in a linear direction by reciprocating the lever 21, a side wall 3 extending in the axial direction of the outer cylinder 7 is formed at the tip of the frame body 1, and this side wall 3 is A long guide hole 5 is formed extending in the axial direction of the outer cylinder 7, and the end of the pivot pin 33 of the tension case 31 is inserted into the long guide hole 5, and the fulcrum of the lever 21 relative to the frame body 1 is connected to the lever. A tightening tool such as a board anchor, characterized in that it is movable as the board rotates.