JP3160761B2 - Drafting compass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing compass mainly provided for school children.

[0002]

2. Description of the Related Art Conventionally, a protection tube has been conventionally fitted to a needle tip so as to be able to be inserted and removed so as to protect it from a puncture or the like, but safety has been ensured. There is a problem that not only is it troublesome to store it so that it is not lost, but it must be continued in a dangerous state after it has been inadvertently lost.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel drafting compass devised to solve the above problems.

[0004]

SUMMARY OF THE INVENTION To achieve the above object, a drawing compass according to the present invention is a protective compass for covering a needle tip 3 with a center leg 2 having a needle 1 at a tip. Fitting the cover to the projecting shaft and the shaft hole provided in the bearing of the projecting shaft.
Apart from the above when returning turning the state hidden covered by the engagement or disengagement of the engaging projection and the engaging hole also upward when the protective cover began turning downward while the shaft applied by deposition
The engagement or disengagement of the engaging projection and the engaging hole are those comprising as a state of maintaining a non-covered hidden state.

[0005]

The compass for drafting according to the present invention has the above-described configuration. When not used for drafting, the protective cover 4 is turned downward and the needle 1 is inserted into the protective cover 4. The tip portion 3 of the needle 1 is completely retracted, and when used, the protective cover 4 is turned back up to remove the tip portion 3 of the needle 1.
Of course, it is used in such a way as to bring out the surface, and it has convenient and remarkable effects such as good usability. However, in particular, in the present invention, the protective cover does not need to be removed even when used or not used. Therefore, there is an advantage that there is no fear of losing this and there is no need to manage it, and it can be used in a safe state with a protective cover until the end.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIG.
And a drawing compass having a holder 8 for a writing instrument (pencil) 7 at the tip of the rotating leg 6, which is made of a transparent hard plastic, and is made of a transparent hard plastic. The connecting portion 11 provided between the front ends of the left and right side wall portions 9 and 10, the bearing portions 12 and 13 provided at the base end of the left and right side wall portions 9 and 10, and the inside of the connecting portion 11 are recessed. And a storage recess 14 of the needle tip portion 3 as described above.
Is turned downward by fitting a pair of left and right protruding shafts 15 and 16 provided in advance on the left and right sides of the front end with shaft holes 17 and 18 provided in the bearings 12 and 13. When the cover is concealed when it comes out, it is supported so as to exhibit a non-covered state when it is turned up again, and left and right engagement holes 19, 20 are provided at the center of the semicircular walls 9, 10. ,
The left and right engagement holes 19 and 20 are freely engageable with a pair of upper and lower engagement protrusions 21 and 22 provided in advance on the left and right sides of the distal end portion of the center leg 2. Projection 2
2, when the protective cover 4 is covered and hidden,
Further, the non-covered state is maintained when locked to the upper engaging projection 21.

The holder 8 of the writing implement 7 is
Are formed integrally with each other at the lower portion of the U-shaped portion, hexagonal fixed side holes 27 and 28 are opened in the upper surface wall 25 and the lower surface wall 26 of the U-shaped portion 24, and the U-shaped portion 24 is formed. The rear wall 29 is provided with a long hole 30 communicating left and right, and the operation wheel 31 is inserted into the long hole 30, and the screw rod 33 for advance and retreat is screwed into the center screw hole 32 of the operation wheel 31. The outer end and the inner end of the screw rod 33 are connected to the inner and outer walls 34 of the slot 30,
35, through the through holes 36, 37, advancing / retreating member 39 having a hexagonal movable side hole 38 is fixed to the inner projecting end, and the advancing / retreating screw rod 33 and the advancing / retreating member 39 are integrated, The weight of the movable side hole 38 and the fixed side holes 27 and 28 changes when the advance / retreat member 39 is moved inward or outward by rotating the operation wheel 31 with fingers. Equal movable side hole 38, fixed side hole 27,
After the writing implement 7 is inserted through the pen 28, the operating wheel 31 is rotated to increase the weight, so that the writing implement 7 is pressed against the cutting lines of the movable side hole 38 and the fixed side holes 27 and 28.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention in an open leg state.

FIG. 2 is a perspective view showing the same leg in a closed state.

FIG. 3 is a perspective view showing the cover in a hidden state.

FIG. 4 is a partially cutaway front view showing a main part.

FIG. 5 is a partially cutaway side view showing a mounting portion of a cover.

FIG. 6 is a longitudinal sectional view of a holder.

FIG. 7 is a cross-sectional view of the holder.

FIG. 8 is an exploded perspective view of a holder.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 needle 2 center leg 3 tip 4 protection cover 6 rotating leg 7 writing implement 8 holder 9, left and right side walls 11 connecting portion 12, 13 bearing 14 storage recess 15, 16 projecting shaft 17, 18 shaft hole 19 , 20 left and right engaging holes 21, 22 vertical engaging projections 24 U-shaped portion 25 upper surface wall 26 lower surface wall 27, 28 fixed side hole 29 back wall 30 long hole 31 operating wheel 32 center screw hole 33 advance / retreat screw rod 34 , 35 inner and outer walls 36, 37 through hole 38 movable side hole 39 advance / retreat member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B43L 9/02 B43L 9/08 B43L 9/12-9/16

Claims (1)

(57) [Claims] 1. A projecting shaft a protective cover for obscure tip portion 3 of the needle with respect to the center leg 2 with the needle 1 to the distal end and the
When the shaft is attached by fitting the shaft hole provided in the bearing part of the projecting shaft
Engagement when both out turning the protective cover downward
When the concealed state is turned up again by the engagement and disengagement of the projection and the engagement hole, the engagement projection and the engagement hole are different from the above.
Deliberately Jo to maintain the non-covered hidden state by engagement and disengagement of
A compass for drafting, comprising: