JPS6321122B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tape measure.

Conventionally, this type of tape measure has a reference line (zero point) of the tape measure.
Two people are required to measure the distance, one who aligns the distance with the starting point of the object to be measured and the other who aligns the distance with the end point of the object and reads the measured distance. In addition, since the reference line is measured by grasping it with your fingers and aligning it with the starting point of the object to be measured, the measured values tend to be inaccurate, and this drawback is even more noticeable at measurement points where it is difficult to align the reference line with the starting point of the object to be measured. Ta.

The present invention connects a plurality of bendable link members and a magnet to the tip of a cutting body, and bends the link members appropriately to attract the reference line of the magnet to the starting point of the object to be measured. , which eliminates the above-mentioned drawbacks.

An embodiment of the present invention will be described below based on FIGS. 1 to 3.

Reference numeral 1 denotes a tape measure storage case, and a tape measure main body 2 having a scale attached thereto is housed in the case 1 so that it can be pulled out. A plurality of link members M ₁ , M ₂ , M ₃ having the same length are connected to the tip of the stub body 2 in a chain shape so that they can be bent freely by connecting members 3 such as rivets or pins. The mounting portion 7 of the magnet body 4 is connected to the front end of the most advanced link member _M1 by a connecting member 3a such as a pin or bolt. The magnet body 4 integrally forms a housing part 6 in which a permanent magnet 5 is embedded in the front part of the above-mentioned mounting part 7. The housing part 6 of the magnet body 4 and the front end surface of the permanent magnet 5 are the same smooth surface, and this smooth surface is used as a reference line 8. Therefore, this reference line 8 is attached to the object to be measured by the attraction force of the permanent magnet 5. It is attracted to the starting point _S1 of S.

If the centers of the link members M ₁ , M ₂ , M ₃ and the connecting members 3, 3, 3, 3a of the magnet body 4 are connection points D, C, B, A, each link member M ₁ ,
Connection distance of M ₂ and M ₃ = L ₄ , = L ₃ , = L ₂ ,
A8=L ₁ are all the same length. In this embodiment, L ₁ , L ₂ , L ₃ , and L ₄ are set to 15 mm, but they are not limited to these values and can be adopted as appropriate.

A protrusion 9 is formed at one end of the front end connection point A of the most extreme link member _M1 , while the protrusion 9 is formed at the rear end connection point D of the rearmost link member _M3 .
A fitting hole 10 is formed into which the holder is removably fitted.

In this way, by bending any of the link members M ₁ , M ₂ , M ₃ or the magnet 4, the reference line 8 of the magnet 4 is attracted to the starting point S ₁ of the object to be measured S, and measurement can be performed from any direction. It is something that becomes possible.

The operation of this invention will be explained. As shown in the first diagram,
From the state where the link members M ₁ , M ₂ , M ₃ and the magnet body 4 are in a straight line, as shown in the second figure, the link members M ₂ , M ₃ are made to be in a straight line with the insert body 2, The link member _M1 is bent perpendicularly to this straight line, and further bent so that the reference line 8 of the magnet body 4 faces the side of the insert body 2 (that is, into a figure 7 shape). When the magnet 4 is attracted to the back surface of the object S, the measurement can be performed using the same back surface as the starting point _S1 . That is, in this case, the reference line 8 is on the same straight line as the connection point C, and therefore, the distance (L ₄ ) from the connection point D to C is added to the point D.
Since the scale at point D on the main body 2 is marked by adding the distance (L ₄ ), the scale at the measurement end point of the object to be measured S becomes the actual distance.

Further, as shown in the third figure, the protrusion 9 of the connection point A is fitted into the fitting hole 10 formed at the connection point D, so that each link member M ₁ , M ₂ , M ₃ forms a triangle. By bending and adhering the magnet 4 to the front or plane of the object to be measured S, measurement can be performed using the same front or plane as the starting point _S1 . In this case, connection point D is connection point A
Since the distance from the reference line 8 to the connection point D is the same as (L ₁ )=8, the actual distance can be read in the same manner as described above.

In the above embodiment, the protrusion 9 is shown as a round bar-shaped pin, but the tip is vertically split at a plurality of equally spaced positions so that it can be expanded and contracted, and the protrusion 9 is inserted into the fitting hole 10. It is also possible to make it expand when it is press-fitted by its restoring force and be prevented from coming off.

In the magnet body 4, the housing portion 6 and the attachment portion 7 may be formed separately. If the storage part 6 is covered with a cap, the permanent magnet 5 will be protected from dust such as iron powder.
has the advantage of being protected.

Furthermore, although three link members are formed in this embodiment, the number can be selected as appropriate.

The present invention has the above-described configuration, and includes connecting a plurality of link members M ₁ , M ₂ , M _{3 .} . . of the same length to the tip of the main body 2, and
A permanent magnet 5 is installed at the front end of the most advanced link member _M1 .
The connecting distance of each link member and the connecting distance between the front end connecting point of the most advanced link member _M1 and the reference line 8 of the magnet body 4 are made equal lengths, while the maximum A protrusion 9 is formed at one end of the front end connection point of the tip link member _M1 , and the protrusion 9 is removably fitted to the rear end connection point of the rearmost link member _M3 . A fitting hole 10 is formed, and the link members M ₁ , M ₂ , M _{3 .} It is made to be adsorbed to.

Therefore, since the reference line 8 of the magnet body 4 is attracted to the starting point _S1 of the object to be measured S by the magnetic attraction force, it is difficult for a person to align the reference line of the tape measure to the starting point _S1 of the object to be measured S as in the past. It has the advantage that it can be measured by one person without the need for

In addition, a reference line 8 is formed on the tip surface of the magnet body 4, and as a result of this reference line 8 being directly attracted to the starting point _S1 of the object to be measured S, there is no room for measurement errors to occur at the starting point _S1 position. From this, accurate measurements can be made.

Further, since the reference line 8 of the magnet 4 can be attracted to the starting point _S1 of the object S by bending any of the link members and the magnet 4, the measurement can be performed from any direction.

[Brief explanation of the drawing]

Each figure shows an embodiment of this invention.
FIG. 1 is a plan view, FIG. 2 is a side view showing a first usage, and FIG. 3 is a side view showing a second usage. 2... Sashimi main body, 3, 3a... Connecting member, 4...
...Magnet body, 5...Permanent magnet, 8...Reference line, 9...
...Protrusion, 10... Fitting hole, M ₁ , M ₂ , M ₃ ...
Link member, S...Object to be measured, _S1 ...Start point.

Claims (1)

[Claims] 1 Connect multiple link members of equal length to the tip of the sashimi body, connect a magnet body with a permanent magnet to the front end of the most advanced link member, and calculate the connection distance of each link member. , the connection distance between the front end connection point of the most extreme link member and the reference line of the magnet body is made equal in length, while a protrusion is formed at one end of the front end connection point of the most extreme link member, and a protrusion is formed at one end of the front end connection point of the most extreme link member, and A fitting hole into which the protruding portion is removably fitted is formed at the connecting point of the rear end of the link member, and an arbitrary one of the link member and the magnet body is bent to align the reference line of the magnet body. A tape measure characterized by being able to be attached to the starting point of an object to be measured so that it can be measured from any direction.