JP2022143993A - Marking prism - Google Patents

Abstract

To provide a marking prism which is easy to handle and facilitates scribing work.SOLUTION: A prism 2 provided herein can be removably attached to a rear end of a writing tool 3 via an attachment 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a marking prism used for marking work at a construction site.

In general surveying, a prism used as a target is attached to a pole, an operator holds the pole vertically at a measurement point, and the prism is measured by a surveying instrument. Furthermore, when marking out, the point (measurement point) indicated by the lower end of the pole is marked with a marking tool such as a writing instrument.

Also, in marking work indoors at a construction site, measurement and scribing at a short distance are frequently performed. In the conventional pole with a prism, both the prism and the pole are difficult to handle in frequent work in a large narrow space, and the workability is also poor because it is necessary to switch to a scribing tool each time a scribe is written.

JP-A-60-225102 JP 2020-3324 A

An object of the present invention is to provide a marking prism which is easy to handle and facilitates the marking work.

The present invention relates to a marking prism that can be detachably attached to a pen tip of a writing instrument through an attachment.

Further, according to the present invention, the attachment is constituted by a bolt provided on the prism and a screw hole additionally processed on the shaft end of the writing instrument, and when the prism is attached to the writing instrument, the axis of the writing instrument The present invention relates to a marking prism that passes through or substantially passes through the optical center of the prism.

Further, according to the present invention, the attachment has a holder that can be fitted to and removed from the shaft bottom of the writing instrument, the prism is provided on the shaft bottom end side of the holder, and the holder is attached to the writing instrument. The present invention relates to a marking prism in which the axis of a writing instrument passes through or substantially passes through the optical center of the prism.

Further, according to the present invention, the holder has a holder main body and a cylinder nut, a screw is formed on the pen tip side portion, a plurality of slits are formed along the axis, and the cylinder nut is screwed onto the screw. Thus, the present invention relates to a marking prism which can be attached to the shaft of a writing instrument by reducing the diameter of the pen tip side portion.

Further, according to the present invention, the holder that can be fitted to and detached from the shaft butt portion of the writing instrument is a cap of the writing instrument, a screw hole is additionally processed at the tip of the cap, and a bolt is attached to the tip of the cap, and the prism is inserted through the screw hole. is affixed to a marking prism.

Further, according to the present invention, a holder that can be fitted to and removed from the shaft bottom portion of a writing instrument has an arc-shaped cross section obtained by cutting a part of the cylindrical body, the holder is made of an elastic material, and the shaft bottom portion is made of a material having elasticity. (1) relates to a marking prism which is mounted by being pushed in from the notched portion of the holder, and the holder is constructed so that an elastic force acts on the holder in the diameter contracting direction in the mounted state.

Further, according to the present invention, the holder can be inserted between the shaft of the writing instrument and the clip by rotating about the shaft, and the engagement between the base of the clip and the holder allows the holder to move. The present invention relates to a marking prism which is prevented from coming off.

Further, according to the present invention, a rotation-preventing projection is formed on the upper edge of the tip of the holder, and the rotation-preventing projection engages with the base of the clip when the holder is inserted between the shaft of the writing instrument and the clip. and a marking prism in which rotation of the holder is suppressed.

Further, according to the present invention, the upper edge of the holder is slanted, and when the holder rotates, the upper edge comes into contact with the base of the clip, thereby suppressing rattling between the holder and the shaft by a wedging action. It relates to a prism for extraction.

Further, according to the present invention, the holder that can be fitted to and detached from the shaft end of the writing instrument has three strip-shaped holder plates extending downward, and the holder plates are curved so as to protrude toward the center, The radius of the minimum circle inscribed in the three holder plates is smaller than the outer diameter of the shaft bottom portion by a predetermined amount, and the shaft bottom portion is attached to the shaft bottom portion from the axial direction, and the holder is contracted in the attached state. The present invention relates to a marking prism constructed so that radial elastic force acts thereon.

Further, according to the present invention, the holder that can be fitted to and detached from the shaft end of the writing instrument has three strip-shaped holder plates extending downward, and the tip of the holder plate is curved toward the center, and the tip is centered. This invention relates to a marking prism which has a convex portion formed on the side, is attached to the shaft butt portion from the axial direction, and is constructed such that elastic force acts on the holder in the diameter contracting direction in the attached state.

Further, according to the present invention, the holder includes a pair of openable and closable holder plates, a spring is provided between the holder plates to urge the holder plates in the closing direction, and the shaft bottom portion is held between the holder plates. 1. A marking prism in which the holder plate is fitted to the bottom of the shaft.

The present invention also relates to a marking prism having a circular vial on the upper surface of the prism.

The present invention also relates to a marking prism having a circular vial on the side of the holder.

Further, according to the present invention, the container of the circular bubble tube is transparent, and the upper and lower surfaces of the chamber in which the liquid is enclosed are spherical surfaces having the same curvature, so that the writing instrument can be positioned vertically regardless of whether the writing instrument is upright or inverted. The present invention relates to a marking prism that can be confirmed.

Furthermore, the present invention is directed to a marking prism further comprising a prism guard configured to surround the prism with a wire and forming a gap between the prism and the plane in all directions with respect to adjacent planes. It is related.

According to the present invention, the prism can be detachably attached to the butt end of the writing instrument through the attachment.

1 is a perspective view showing a first embodiment of the present invention; FIG. FIG. 11 is a perspective view showing a second embodiment of the present invention; It is a figure which shows the 3rd Example of this invention, (A) is the figure which mounted|worn the cap to the pen point part, (B) is the figure which mounted the cap to the barrel-end part. It is explanatory drawing which shows the 4th Example of this invention, (A) is a front view, (B) (C) is a top view. The 1st modification of the 4th Example of this invention is shown, (A) is a front view, (B) is a side view. A second modification of the fourth embodiment of the present invention is shown, (A) is a front view, and (B) is a side view. The 3rd modification of the 4th Example of this invention is shown, (A) is a front view, (B) is a side view. It is explanatory drawing which shows the 5th Example of this invention, (A) is a front view, (B) is a top view. It is explanatory drawing which shows the 5th Example of this invention, (A) has shown before mounting|wearing of an attachment, (B) has shown after mounting|wearing. It is a front view which shows the modification of the 5th Example of this invention. It is an explanatory view showing a sixth embodiment of the present invention, and is a front view. It is explanatory drawing which shows the 7th Example of this invention, (A) is a front view, (B) is an A arrow directional view of (A). It is explanatory drawing of the circular bubble tube provided in an attachment, (A) has shown the writing instrument in an upright state, (B) has shown the writing instrument in an inverted state. It is explanatory drawing which shows the 8th Example of this invention, (A) is a general view, (B) is explanatory drawing of a prism part. FIG. 20 is an explanatory diagram showing a modification of the eighth embodiment, and is a perspective view of a prism portion; (A) is a plan view of the prism portion of the modification, and (B) is a side view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment.

In FIG. 1, 1 is a marking prism, and the marking prism 1 has a prism 2 and an attachment 4 that allows the prism 2 to be attached to a writing instrument 3 for scribing, preferably detachable. ing.

The prism 2 is composed of a plurality of prism elements, and is capable of retroreflecting incident light in all circumferential directions. Furthermore, the prism 2 is constructed to be small so that it can be attached to the writing instrument 3 . Since a large amount of reflected light is not required for short-distance measurement, such as indoors, the size of the prism 2 can be reduced. Also, a reflective sheet may be used instead of the prism.

The attachment 4 has a bolt 5 provided on the prism 2 so as to extend downward from the lower surface thereof and a holder 7 mounted on the shaft 6 of the writing instrument 3 .

The axial center of the bolt 5 is set so as to pass through the optical center of the prism 2 .

The holder 7 is a cylindrical body that can be fitted to and removed from the shaft 6 on the side opposite to the pen point (hereinafter referred to as the shaft bottom side), and the shaft bottom side end is a closed end.

Frictional force is generated between the holder 7 and the shaft body 6 when the holder 7 is fitted to the shaft butt end side of the shaft body 6 and mounted. The frictional force maintains the mounting state of the holder 7 on the shaft 6 .

A screw hole 8 is formed in the end of the holder 7 on the butt end side, and the bolt 5 is screwed into the screw hole 8 . Therefore, the prism 2 is attached to the holder 7 through the bolt 5 so as to be integrated with the holder 7, and can be removed from the holder 7. As shown in FIG.

Further, when the prism 2 is attached to the holder 7 and the holder 7 is attached to the shaft 6, the axis of the bolt 5 and the axis of the shaft 6 (a line passing through the pen tip) are different. parallel or nearly parallel.

When performing a marking operation using the marking prism 1 , a cap (not shown) is removed from the writing instrument 3 and the holder 7 is mounted on the shaft 6 . By mounting the holder 7 on the shaft 6 , the writing instrument 3 and the prism 2 are integrated, and the axis of the writing instrument 3 passes through or substantially passes through the optical center of the prism 2 .

An operator holds the shaft 6 (that is, the writing instrument 3) vertically on the measuring point, and measures the prism 2 with a measuring machine (not shown). When the measurement is completed, the tip of the writing instrument 3 is grounded on the floor or the ground, and the measurement points are marked.

In this embodiment, the prism 2 and the writing instrument 3 are integrated, and the prism 2 is miniaturized, so that it is easy to handle. Therefore, the workability is good, and an error can be prevented at the time of scoring.

Since the prism 2 is detachable from the holder 7, a plurality of holders 7 having different inner diameters are prepared so that the holder 7 corresponds to the type of writing instrument to be used. A prism 2 may be attached.

In the above embodiment, the holder 7 is provided separately from the cap of the writing instrument, but the holder 7 may be used as the cap of the writing instrument.

A second embodiment will be described with reference to FIG.

In the second embodiment, the marking prism 1 can be attached to the shafts 6 having different outer diameters by means of one holder 11 .

The holder 11 has a holder body 12 and a tubular nut 13 . A screw 14 is formed on the pen point side portion of the holder body 12, and a plurality of slits 15 are formed along the axis.

The cylinder nut 13 can be screwed onto the screw 14, and by tightening the cylinder nut 13 onto the screw 14, the diameter of the pen point side portion is reduced.

Therefore, even if the outer diameter of the shaft 6 inserted into the holder 11 changes, the marking prism 1 can be attached to the shaft 6 (writing instrument 3) by adjusting the tightening of the cylinder nut 13. is possible.

In the second embodiment, the bolt 5 may be omitted and the prism 2 may be directly bonded to the holder 11. FIG.

A third embodiment will be described with reference to FIGS. 3(A) and 3(B).

In the third embodiment, the marking prism 1 is directly attached to a writing instrument 3 available on the market.

A screw hole 8 is formed in the top of the cap 17 of the writing instrument 3, and the prism 2 is attached to the cap 17 by screwing the bolt 5 (see FIG. 1) of the prism 2 into the screw hole 8. can be done. Since the prism 2 is attached to the cap 17 via the bolt 5, it can be removed. When the writing instrument 3 is to be renewed, the prism 2 can be removed and replaced with a new writing instrument 3. good.

The cap 17 is used as the holder 7 in the third embodiment. Therefore, the attachment 4 (see FIG. 1) can be configured by simply additionally processing the screw hole 8 in the cap 17 without manufacturing the holder 7 . Therefore, the attachment 4 can be configured simply and inexpensively. Furthermore, when renewing the writing instrument 3, the prism 2 may remain attached to the cap 17 and only the shaft 6 may be replaced.

In some writing instruments 3, a clip is attached to the cap 17 by a screw. In this case, the prism 2 may be attached using a threaded hole for the screw.

When the prism 2 is attached to the commercially available writing instrument 3, a screw hole may be bored in the bottom end of the shaft body 6 and the prism 2 may be attached to the bottom end of the shaft. In this case, the bolt 5 and the additionally processed screw function as an attachment.

A fourth embodiment will be described with reference to FIGS. 4(A), 4(B), and 4(C).

In the fourth embodiment, a marking prism 1 detachable from a commercially available writing instrument 3 is shown. The marking prism 1 has a prism 2 and an attachment 21 .

In the writing instrument 3 shown in FIG. 4, there is no distinction between the cap and the barrel, and a clip 27 is provided at the bottom of the shaft, and the attachment is directly attached to the bottom of the shaft. . Needless to say, the attachment described below can also be applied to the writing instrument 3 having a cap.

The attachment 21 is detachable from the side of the writing instrument 3 .

The attachment 21 comprises a holder 22 fitted to the writing instrument 3 and a shelf portion 23 for supporting the prism 2. The holder 22 and the shelf portion 23 are formed integrally.

The holder 22 has an arcuate cross section obtained by cutting a part of the cylindrical body, and the arc length (peripheral length) has a central angle exceeding 180°. For the attachment 21, a material having elasticity such as metal or synthetic resin is used.

The shelf portion 23 is connected to the holder 22 through the neck portion 24 and supported so as to be horizontal (perpendicular to the axis of the writing instrument 3).

A prism 2 is attached to the shelf portion 23 . The prism 2 is attached to the ledge 23 by an appropriate method such as bolts (see FIG. 1) or adhesion.

Also, in this embodiment, a circular bubble tube 25 is provided on the upper surface of the prism 2 .

In the fourth embodiment, attachment of the attachment 21 to the writing instrument 3 is accomplished by pushing the holder 22 into the writing instrument 3 through the notch, and the notch expands due to elastic deformation of the holder 22. Then, the attachment 21 is fitted into the writing instrument 3 (FIGS. 4(B) and 4(C)). The shape of the holder 22 is set so that the holder 22 exerts an elastic force on the writing instrument 3 in the diameter contracting direction while the attachment 21 holds the writing instrument 3 . Further, since the holder 22 is an elastic body, it deforms according to the outer diameter of the writing instrument 3, so that the attachment 21 can be attached to writing instruments 3 having different outer diameters.

Furthermore, by bringing the upper end of the writing instrument 3 into contact with the lower surface of the shelf portion 23, positioning relative to the writing instrument 3 is achieved, and the attachment of the holder 22 to the writing instrument 3 is completed.

Here, the shape of the attachment 21 is set so that the axis of the writing instrument 3 passes through or substantially passes through the optical center of the prism 2 when the attachment 21 is attached to the writing instrument 3 . Further, the shelf portion 23, that is, the circular bubble tube 25 is set so as to be perpendicular to the axis of the writing instrument 3. As shown in FIG.

Also in the fourth embodiment, it can be attached to a commercially available writing instrument 3, and the marking prism 1 is constructed integrally with the writing instrument 3. FIG. Furthermore, in the case of this embodiment, since the circular bubble tube 25 is provided, the marking work can be performed while confirming the vertical state of the writing instrument 3, so that the accuracy of the marking work is improved.

The circular bubble tube 25 is not limited to the upper surface of the prism 2, and may be provided on the side of the holder 7 as described later.

A first modification of the fourth embodiment will be described with reference to FIGS. 5(A) and 5(B). 5(A), 5(B), 4(A), 4(B), and 4(C) are denoted by the same reference numerals. Description is omitted.

In the first modified example, after the attachment 21 is attached to the writing instrument 3, it is rotated around the writing instrument 3 so that the attached state is more reliable.

The upper end position of the holder 22 of the attachment 21 is lowered, the lower end position is raised, and the holder 22 is inserted into the gap between the shaft 6 and the clip 27 by rotating the attachment 21, Furthermore, the upper end of the holder 22 abuts on the base portion 27a of the clip 27, and the upward displacement of the attachment 21 is restricted. In the fourth embodiment, the holder 22 is engaged with the base portion 27a to obtain the effect of retaining.

A second modification of the fourth embodiment will be described with reference to FIGS. 6(A) and 6(B). In FIGS. 6A and 6B, the same reference numerals are given to the same parts as those shown in FIGS.

In the second modified example, after the attachment 21 is attached to the writing instrument 3, the writing instrument 3 is rotated around the writing instrument 3 so that the upward displacement of the attachment 21 is restricted and the rotation of the attachment 21 is restricted, The attachment 21 is designed to be retained in a more reliable state.

In the first modified example described above, a detent projection 22a is provided on the upper edge of the holder 22 of the attachment 21 (the end on the side of the clip 27 in FIG. 6A). In this case, the holder 22 is made of an elastically deformable material, and the anti-rotation protrusion 22a is made vertically displaceable.

6A, the attachment 21 is rotated to insert the holder 22 into the gap between the shaft 6 and the clip 27. As shown in FIG. At this time, when the anti-rotation projection 22a passes through the base portion 27a, it is elastically displaced downward and returns to its original position after passing.

FIG. 6(B) shows a state in which the holder 22 is completely inserted into the gap between the shaft 6 and the clip 27. When the attachment 21 is reversely rotated, the anti-rotation protrusion 22a Since it interferes with the base portion 27a and acts as a resistance against reverse rotation, the insertion state of the holder 22 into the gap is maintained, and the removal prevention state of the attachment 21 is more reliably maintained.

The anti-rotation projection 22a may be made of a soft synthetic resin that is easily deformed, or a slit may be formed in the lower side of the anti-rotation projection 22a in the horizontal direction to facilitate displacement.

A third modification of the fourth embodiment will be described with reference to FIGS. 7A and 7B. 7(A), 7(B), 5(A), and 5(B) are given the same reference numerals, and the description thereof will be omitted.

In the third modification, the rotation of the attachment 21 reliably prevents the attachment 21 from axially displacing with respect to the writing instrument 3 .

The upper edge 22b of the holder 22 is inclined downward from the neck portion 24 toward the tip. Further, the state position of the tip of the holder 22 is lower than the base 27a of the clip 27, and when the attachment 21 is rotated and the holder 22 is inserted between the clip 27 and the shaft 6, , the holder 22 and the base portion 27a do not interfere with each other, and when the holder 22 is further rotated, the upper edge 22b of the holder 22 contacts the base portion 27a. It restrains between the upper edge 22b.

In the third modification, even if there are individual differences in the attachment 21 and the writing instrument 3, the attachment 21 can be attached to the writing instrument 3 reliably and without rattling.

A fifth embodiment will be described with reference to FIGS. 8(A), 8(B), 9(A) and 9(B). 8(A), 8(B), 9(A), 9(B), 5(A) and 5(B) are identical to those shown in FIGS. Reference numerals are attached and descriptions thereof are omitted.

In the fifth embodiment, the attachment 31 is inserted into the writing instrument 3 from the shaft rear end thereof.

The attachment 31 will be explained.

The prism 2 is attached to the upper surface of the circular crown portion 32 by an appropriate method such as bolting or adhesion, and set so that the optical center of the prism 2 is positioned on the axis of the crown portion 32 . The crown portion 32 is provided with a support portion 33 extending in a horizontal direction perpendicular to the axis of the crown portion 32 , and a circular vial 25 is provided on the side of the crown portion 32 via the support portion 33 . .

Also, when the circular vial 25 is provided on the side of the crown 32 , the upper surface of the circular vial 25 may be arranged to be the same as or lower than the lower end of the prism 2 . preferable. By positioning the upper surface of the circular bubble tube 25 below the lower end of the prism 2, a field of view is ensured when the prism 2 is measured by a measuring machine.

Three strip-shaped holder plates 34 are provided on the crown portion 32, and the holder plates 34 extend downward and have a predetermined elastic force. The holder plate 34 is curved so as to protrude toward the center, and the radius of the minimum circle inscribed in the three holder plates 34 is smaller than the outer diameter of the writing instrument 3 by a predetermined amount. .

Three holder plates 34 extending from the crown portion 32 constitute a holder attached to the shaft 6 .

The attachment 31 has an attachment clip 35 , and the attachment clip 35 is provided on the side surface of the crown portion 32 at a position where it does not interfere with the clip 27 .

A conical or spherical concave portion 36 is formed in the lower surface of the crown portion 32 , and the axis of the concave portion 36 coincides with the axis of the crown portion 32 .

When the attachment 31 is attached to the writing instrument 3, the writing instrument 3 is inserted into the attachment 31 from the shaft rear side as shown in FIGS. 9A and 9B.

The holder plate 34 is pushed open by the insertion of the writing instrument 3 , and the writing instrument 3 is held by the holder plate 34 due to the elastic force of the holder plate 34 . It is designed to match the axis. The holding force of the holder plate 34 prevents the writing instrument 3 from falling, and the inserted state of the writing instrument 3 is maintained.

Further, when the writing instrument 3 is pushed in and the shaft tail end is fitted into the recess 36 , the center of the shaft tail end is aligned with the center of the crown portion 32 by the recess 36 .

The attachment 31 is attached to the writing instrument 3 so that the optical center of the prism 2 is positioned on the axis of the writing instrument 3 .

The attachment 31 can hold writing instruments 3 having different outer diameters within the elastic deformation range of the holder plate 34, and can be attached to writing instruments 3 having different diameters. In the above description, three holder plates 34 are provided, but the number of holder plates 34 may be two or four or more as long as they can hold the writing instruments 3 .

Also, in a fifth embodiment, the attachment 31 is rotatable with respect to the writing instrument 3, and the holder 22 as shown in FIGS. may be formed.

In the fifth embodiment, the three holder plates 34 function as holders.

Also in the fifth embodiment, it can be attached to a commercially available writing instrument 3, and the marking prism 1 is constructed integrally with the writing instrument 3. FIG. Furthermore, it can be confirmed whether the circular bubble tube 25 and the writing instrument 3 are in a vertical state. Thus, the marking operation can be performed while confirming the vertical state of the writing instrument 3 .

In addition, in the fifth embodiment, the circular bubble tube 25 may be provided on the upper surface of the prism 2 .

FIG. 10 shows a modification of the fifth embodiment. In FIG. 10, parts equivalent to those shown in FIGS. 8 and 9 are denoted by the same reference numerals, and descriptions thereof are omitted.

In this modified example, the tip portion (lower end portion in the figure) of the holder plate 34 is curved toward the center, and a convex portion 34a is formed on the tip center side. In this modified example as well, when the writing instrument 3 is inserted into the attachment 31 , the holder plate 34 is spread, and the writing instrument 3 is held by the attachment 31 by the elastic force of the holder plate 34 .

An attachment 44 according to a sixth embodiment will be described with reference to FIG. In FIG. 11, the same reference numerals are given to the same parts as those shown in FIGS. 8A and 8B, and the explanation thereof will be omitted.

The attachment 44 has a pair of openable and closable holder plates, and by holding the shaft 6 between the holder plates, the attachment 44 can be attached to and detached from the shaft 6 .

A holder plate 45 extending downward is provided on the crown portion 32 , and a movable holder plate 47 is rotatably provided on the holder plate 45 via a pin 46 . Between the movable holder plate 47 and the holder plate 45, the lower end portion 47b of the movable holder plate 47 is brought close to the holder plate 45, that is, the holder plate 45 and the movable holder plate 47 are attached in the closing direction. A biasing spring (not shown) is provided.

An upper end portion 47 a of the movable holder plate 47 serves as a knob for opening and closing a lower end portion 47 b of the movable holder plate 47 with respect to the holder plate 45 .

The holder plate 45 and the movable holder plate 47 function as holders in the sixth embodiment.

When the attachment 44 is attached to the writing instrument 3, the upper end portion 47a is pinched, the lower end portion 47b is opened, and the shaft butt portion of the writing instrument 3 is sandwiched between the holder plate 45 and the lower end portion 47b. The plate 45 and the movable holder plate 47 are fitted to the shaft end portion of the writing instrument 3 . The attachment 44 is attached to the writing instrument 3 through the holder plate 45 and the movable holder plate 47, and the spring holds the writing instrument 3 between the holder plate 45 and the movable holder plate 47. It acts as a holding force for

When the attachment 44 is attached to the writing instrument 3, the axis of the writing instrument 3 passes through the optical center or approximately the center of the prism 2, and the axis of the writing instrument 3 is vertical. , or when it is substantially vertical, the circular vial 25 is horizontal.

In addition, in order to ensure holding, rubber sheets are provided on the inner surfaces of the holder plate 45 and the movable holder plate 47, or the inner surfaces of the holder plate 45 and the movable holder plate 47 are formed in a V-groove shape or a cylindrical shape. It may be shaped or the like.

An attachment 50 according to a seventh embodiment will be described with reference to FIGS. 12(A) and 12(B). In FIG. 12, the same reference numerals are given to the same parts as those shown in FIGS. 8A and 8B, and the explanation thereof will be omitted.

A support column 51 extending downward is provided on the crown portion 32 or the support portion 33 . A lower end of the support column 51 is a pin 52, and a holder plate 53 and a holder plate 54 are attached to the pin 52 so as to be horizontally rotatable (openable and closable). A spring (not shown) is provided between the holder plate 53 and the holder plate 54 to close the ends 53a and 54a.

The writing instrument 3 is sandwiched between the holder plates 53 and 54 from the sides, and the attachment 50 is attached to the writing instrument 3 .

A conical or spherical concave portion 36 is formed in the lower surface of the crown portion 32 , and the axis of the concave portion 36 coincides with the axis of the crown portion 32 .

When the attachment 50 is attached to the writing instrument 3 , the bottom end of the shaft is fitted into the recess 36 . Aligned to the center. Further, the attachment 31 is constructed such that the optical center of the prism 2 is positioned on the axis of the writing instrument 3 .

In addition, a rubber sheet may be provided on the inner surfaces of the holder plates 53 and 54, or a V-groove shape or a cylindrical shape that fits the shaft body 6 may be provided on the inner surfaces of the holder plates 53 and 54. (See FIG. 12(B)).

FIGS. 13(A) and 13(B) show modifications of the circular vials provided in the attachment.

13(A) shows the writing instrument 3 in an upright state, and FIG. 13(B) shows the writing instrument 3 in an inverted state. showing.

The circular bubble tube 38 is formed by sealing a liquid 41 together with bubbles 40 in a transparent container 39 made of a transparent material such as transparent resin or transparent glass.

The upper surface 42a and the lower surface 42b of the chamber in which the liquid 41 is enclosed are spherical surfaces having the same curvature, and the axis of the spherical surface coincides with or is parallel to the axis of the writing instrument 3.

Therefore, when the writing instrument 3 is in an upright state, it can be confirmed from above the circular vial 38 whether the air bubble 40 is positioned at the center of the upper surface 42a, that is, whether the writing instrument 3 is in a vertical state. . Also, when the measurement point is the ceiling, the writing instrument 3 is in an inverted state. You can check whether it is vertical or not.

FIG. 14 shows an eighth embodiment.

If a prism is used as a retroreflector, the prism may be damaged when dropped.

In the eighth embodiment, the attachment has a prism guard 56 that protects the prism 2 . In addition, in FIG. 14, illustration is abbreviate|omitted about the detail of an attachment.

The prism guard 56 forms a gap between the prism 2 and the plane in all directions with respect to adjacent planes, and is shaped so that the prism 2 does not come into contact with the plane. The prism guard 56 is constructed so as to surround the prism 2 with a straight line or a curved line with a wire 57 so as not to block the light as much as possible. The wire 57 is made of metal, resin, rubber, or the like.

The prism guard 56 shown in the eighth embodiment has a configuration in which two upper and lower rings are connected by three vertical wires.

In order to reduce the measurement error due to the optical vignetting of the prism guard 56, the position of the wire 57 should not be on the line 58 extending from the center of the prism to the vertex where the prism ridge lines converge. The connecting portion 59 of the plurality of wire rods 57 may be arranged on the normal line 60 of the center of the prism surface. Alternatively, the wire rod 57 may pass along the normal to the center of the prism surface.

FIG. 15 shows another prism guard 61. FIG.

In the prism guard 61, an example is shown in which the wire rod 62 is formed into a circle, an ellipse, or the like, and the prism guard 61 is composed of a curved line.

In the prism guard 61, each wire 62 is positioned at the center or approximately the center of each plane of the prism 2, and the connecting portion 63 of the wire 62 is normal to the center of the prism surface (FIG. 16(A), See FIG. 16(B)).

1 Inking Prism 2 Prism 3 Writing Tool 4 Attachment 5 Bolt 6 Shaft 7 Holder 8 Screw Hole 11 Holder 17 Cap 21 Attachment 22 Holder 25 Circular Vial 27 Clip 31 Attachment 34 Holder Plate 38 Circular Vial 44 Attachment 45 Holder Plate 47 Movable holder plate 50 attachment 56 prism guard 57 wire rod 61 prism guard 62 wire rod

Claims (16)

A marking prism that can be detachably attached to the shaft end of a writing instrument through an attachment. The attachment is composed of a bolt provided on the prism and a screw hole additionally machined in the shaft end of the writing instrument. With the prism attached to the writing instrument, the axis of the writing instrument 2. The marking prism according to claim 1, which passes through or substantially passes through the . The attachment has a holder that can be fitted to and removed from the shaft bottom portion of the writing instrument, the prism is provided on the shaft bottom end side of the holder, and in a state in which the holder is attached to the writing instrument, the shaft center of the writing instrument 2. A marking prism according to claim 1, which passes through or substantially passes through the optical center of said prism. The holder has a holder body and a cylinder nut, a screw is formed on the pen tip side portion, and a plurality of slits are further formed along the axis. By tightening the cylinder nut onto the screw, the pen can be 4. The marking prism according to claim 3, wherein the diameter of the front side portion is reduced so that the prism can be attached to the shaft of a writing instrument. The holder that can be fitted to and detached from the shaft butt portion of the writing instrument is a cap of the writing instrument, a screw hole is additionally processed at the tip of the cap, and the prism is fixed to the tip of the cap through a bolt and a screw hole. Item 3. A marking prism according to item 3. A holder that can be fitted to and detached from the shaft bottom portion of the writing instrument has an arc-shaped cross section obtained by cutting a part of the cylindrical body, and the holder is made of an elastic material. 4. The marking prism according to claim 3, wherein the holder is mounted by being pushed in from the notched portion of the holder, and the holder is constructed so that an elastic force acts on the holder in a radially contracting direction in the mounted state. The holder can be inserted between the shaft of the writing instrument and the clip by rotating about the shaft, and the holder is prevented from coming off by engagement between the base of the clip and the holder. 7. A marking prism according to Item 6. A rotation-preventing protrusion is formed on the upper edge of the tip of the holder, and when the holder is inserted between the shaft of the writing instrument and the clip, the rotation-preventing protrusion engages with the base of the clip to rotate the holder. 8. The marking prism according to claim 7, wherein is suppressed. 8. The structure according to claim 7, wherein the upper edge of the holder is inclined, and when the holder rotates, the upper edge comes into contact with the base of the clip, and a wedging action prevents rattling between the holder and the shaft. Prism for ink drawing. A holder that can be fitted to and detached from the shaft end portion of the writing instrument has a plurality of strip-shaped holder plates that extend downward, and the holder plates are curved so as to project toward the center. The radius of the minimum inscribed circle is smaller than the outer diameter of the shaft butt portion by a predetermined amount. 4. The marking prism according to claim 3, which is configured to A holder that can be fitted to and detached from the shaft end of the writing instrument has a plurality of strip-shaped holder plates extending downward. 4. A marking prism according to claim 3, wherein said holder is attached to said shaft butt portion from the axial direction, and said holder is constructed so that elastic force acts on said holder in the direction of diameter reduction in the attached state. The holder includes a pair of holder plates that can be opened and closed. A spring is provided between the holder plates to bias the holder plates in a closing direction. 4. The marking prism according to claim 3, which is constructed so as to be fitted to the shaft bottom portion. The marking prism according to any one of claims 1 to 12, wherein a circular vial is provided on the upper surface of the prism. The marking prism according to any one of claims 3 to 12, wherein a circular vial is provided on the side of said holder. The container of the circular vial is transparent, and the upper and lower surfaces of the chamber in which the liquid is enclosed are spherical surfaces having the same curvature, so that the verticality of the writing instrument can be checked whether the writing instrument is upright or inverted. The marking prism according to claim 13 or 14. 13. Further comprising a prism guard configured to surround the prism with a wire and forming a gap between the prism and the plane in all directions with respect to adjacent planes. The marking prism according to item 1.

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