Background technology
Past has been taked all countermeasures for drafting instruments such as compasses for preventing the accident that causes owing to pin, and is for example, well-known at the real compasses that have the pin cap of opening record in the flat 3-62897 communique etc.
Open the compasses of recording and narrating in the flat 3-62897 communique and have following structure real: around this center of circle pin of the shank that has the center of circle pin that stretches out, designed a pin cap, this pin cap can slide at the above-below direction parallel with the axle of this center of circle pin under artificial power of enforcement effect freely, and on the surface of the inner surface of this pin cap and described shank, also be respectively equipped with elongated slot and small embossment, this elongated slot and small embossment have to separate and stop function and guiding function, wherein said separation stops function to prevent coming off of pin cap, and described guiding function is directed to bottom dead center position that covers center of circle pin and the top dead center position that center of circle pin is exposed with the pin cap.
In other words, when compasses when not using, make small embossment slide into the bottom dead center position of its pin cap that is meshed with the elongated slot lower end, center of circle pin is capped, thereby the accident that prevents to stab and so on.On the other hand, when using compasses, make small embossment slide into the top dead center position of its pin cap that is meshed with the elongated slot upper end, center of circle pin can stretch out from the gateway of pin cap lower end.
Yet, why above-mentioned compasses always can locate the pin cap respectively at the top dead centre place that lower dead center place that center of circle pin is capped and center of circle pin expose, and what lean on is the frictional force of the inner surface of the cross section of holding shank tightly the pin cap that is コ font roughly with respect to the outer surface of shank.
Like this, in the past, must add the large needle cap to the mantle friction of shank and the frictional force that produces, so the slip of pin cap is sent out puckery.So the pin cap is slided, often need with a hand-tight pin cap that holds on, with the hand-tight shank that holds on of another, otherwise occurring the pin cap easily can not slide into, the problem of the operating difficulties of bottom dead center position and so on, especially for the pupil not only the pin cap be difficult to slide, but also exist because notice concentrates on the danger that sliding of promotion pin cap brought the needlestick injury that hand is extended.
And, the compasses in past are because the abutment surface friction realizes that the pin cap is following, the location at top dead centre place, the operation that in addition makes the pin cap that pin is covered and pin is stretched out, foregoing such, the slip of just parallel with the axle of pin above-below direction is so must design the gateway of coming in and going out for pin that is U font roughly from upward view at the leading section (needle point covering portion) of pin cap.
So when compasses land etc. accidentally, cause the pin cap loosening owing to impact, cause the pin that should be housed in the pin cap to stretch out, stretch out one's hand and do not notice again when picking up that pin stretches out from the gateway, therefore the danger that existence is stabbed etc. be necessary to develop the Security Countermeasures when using.
Summary of the invention
The present invention carries out in view of situation in the past, and its purpose is to provide drafting instruments such as the compasses that improved Security Countermeasures and serviceability and divider, can be simply by one hand the pin cap is moved between the top dead centre that lower dead center that pin is capped and pin expose; And can keep at upper and lower stop place pin cap lockedly; Even just in case when situations such as careless instrument lands occurring, can prevent conscientiously that also pin from stretching out.
For reaching above purpose, the present invention is directed to the drafting instrument that has pin of compasses and divider and so on, the described shank that has a pin and can swinging plane at shank in swing and between the pin cap that above-below direction slides, be provided with retainer, this retainer at the bottom dead center position that pin is covered of pin cap and make bottom dead center position that pin exposes this up and down 2 locate alternately and clutch stops the slip of pin cap freely.
In addition, the present invention is directed to the drafting instrument that has pin of compasses and divider and so on, be in the described shank that has a pin and the cross section that covers pin between the pin cap of コ font roughly and be provided with maintaining part, this maintaining part the pin cap can be swung in the swinging plane of shank and at above-below direction slidably with its maintenance, and, between above-mentioned shank and pin cap, also be provided with down, the top dead centre sticking department, wherein said lower dead center is after the pin cap slides down to the bottom dead center position that pin is capped with the effect of sticking department, first half one side by the oscillation center of pressing cap makes its swing, takes this clutch of pin cap is locked freely; Described top dead centre is to make its swing when the latter half of side by the described oscillation center of pressing cap with the effect of sticking department, when making the pin cap upwards slide into the top dead center position that pin exposes then, the clutch of pin cap is locked freely.
In addition, two sticking departments that above-mentioned upper and lower stop is used, constitute by mutual chimeric protuberance and recess, be located at pin cap one side by one of them, another part is located at the bottom dead center position and the top dead center position of shank one side, thereby the top dead centre place that lower dead center that the pin cap is capped at pin and pin expose is locked under protuberance and recess interlocking state reliably.
Moreover, above-mentioned pin cap selects for use material not only flexible but also that have an appropriate rigidity to make, its cross section is processed to コ font roughly, on the two sides of the first half of its oscillation center, be provided with upper and lower stop sticking department, and begin to be provided with the otch of being divided right and left in two sides from the lower end of above-mentioned first half, purpose is to guarantee the reliability of snap-in force of described sticking department and long-term stability (raising durability).
The specific embodiment
Practical example of the present invention will be illustrated in conjunction with figure:
As using a typical case that has the drafting instrument of pin of the present invention, Fig. 1 has showed a kind of front view of compasses, is made of following well-known parts: the shank 2 that has pin 1; Drawing bar 3; The compasses head 4 of this shank 2 of folding and drawing bar 3; Be contained in the handle 5 at the upper face center position of this compasses head 4, and be provided with the pin cap 6 that to swing and can slide up and down in the lower end that is extended with pin 1 of shank 2.
In addition, can refer to polytype compasses as compasses, such as the propelling pencil type that is equipped with propelling pencil 3-1 on the drawing bar 3 shown in the figure, have the pencil-type of the pencil keeper that is used to install pencil and have pencil core pattern of the pencil-lead keeper that is used to install pencil-lead etc.
Form to the cross section that slides up and down the end portion of corresponding shank 2 in the scope of pin cap 6 from the lower end that is extended with pin 1 as shown in Figure 2 by wide 2-1 and narrow the roughly shape of projection that 2-2 constitutes, on the two sides of the upper section of wide 2-1, be provided with make pin cap 6 can above-below direction slide and in the swinging plane of shank 2 swingingly with the maintaining part 7 of its maintenance, on the two sides of narrow 2-2 lower end, be provided with simultaneously the upper and lower stop sticking department 8,9 that the pin cap slides.
Pin cap 6 rely in the swinging plane of shank 2 swing and at the dual operation of the slip of above-below direction, finish and cover pin 1 and make its action of stretching out (with reference to Fig. 4 (a), (c)), this pin cap 6 is selected the synthetic resin material of have favorable elasticity (restorability) and suitable rigidity (abrasion resistance and keep flexible endurance) for use, for example moulding material moulding such as thermoplastic resin material such as polypropylene, Merlon, cross section in the length range of appointment forms with コ font roughly, and its front end (lower end) has the case type needle point covering 6-1 of portion.
The thickness of the facial 6-2 in the both sides of the first half by making the pin cap 6 that is connected with the needle point covering 6-1 of portion is formation to the inside with thickening, be provided with for the thin 2-2 of the portion embedding of shank 2 and the narrow groove 10 that slides in this leading end side inner, the inside dimensions of this narrow groove 10 is equivalent to the width of narrow 2-2 of shank 2, be provided with upper and lower stop at upper and lower two places of two sides of this narrow groove 10 with sticking department 8,9.
The open shape edge of the facial 6-2 in the both sides of pin cap 6 is with the front end from being connected with the needle point covering 6-1 of portion in side view, longitudinally the part of extending to the back-end is the formation of approximate ヘ font ground, the sweeping crooked edge 6-21 of portion roughly is set towards the rear end of face portion 6-3 then, rear at the length direction central part that is positioned at pin cap 6, the inner surface of the facial 6-2 in two sides that connects the angle position of described crooked edge 6-21 of portion and the ヘ font edge 6-20 of portion is provided with maintaining part 7, and this maintaining part 7 makes pin cap 6 slide and swingingly pin cap 6 is kept in the swinging plane of shank 2 at above-below direction.
11 parts among the figure are otch, as shown in the figure, this otch is from the front end with needle point covering 6-1 of portion of pin cap 6, be arranged at first half one side of pin cap 6 along the lateral center line of face portion 6-3, by this otch 11 is set, guarantee the recess 8-1 of the upper and lower stop of the pin cap 6 that the back will illustrate with sticking department 8,9,9-1 and protuberance 8-2, the latching force freely of the clutch between the 9-2 have reliable life and long-term stability (raising durability).
Among the figure 12 expression is arranged at the anti-skidding portion of the face portion 6-3 of pin cap 6, place this anti-skidding 12 at finger abdomen with thumb, then by first half one side of pressing cap 6 and a latter half of side so that it is a fulcrum with oscillation center P, in the swinging plane of shank 2, swing, when it was slided up and down, this anti-skidding 12 can make aforesaid operations carry out (with reference to Fig. 4) smoothly.
The effect of maintaining part 7 is to guarantee under the state that pin cap 6 does not come off from shank 2, pin cap 6 can be slided along the vertical direction and in the swinging plane of shank 2 swingingly with its maintenance, this maintaining part 7 is made of elongated slot 7-1 and protuberance 7-2, wherein said elongated slot 7-1 is located at the position, rear of wide 2-1 of shank 2, and its length is corresponding to the scope that slides up and down of pin cap 6; Described protuberance 7-2 be located at pin cap 6 first half and latter half of between the inner surface of the facial 6-2 in aforesaid both sides, its external diameter is corresponding with the width and the degree of depth of elongated slot 7-1 with height, can be that swing in the swinging plane of shank 2 at the center with this protuberance 7-2 behind the first half of pin cap 6 and the latter half of pressurized.
That is to say, when make pin cap 6 slide down to protuberance 7-2 by the bottom dead center position of the lower end of the elongated slot 7-1 of stop after, making it by first half one side by pressing cap 6 is oscillation center P swing with protuberance 7-2, the pin 1 that stretches out shank 2 lower ends can be covered, and, in this state, make its swing by a latter half of side of ordering by the aforementioned oscillation center P of pressing cap 6, pin 1 is exposed, and can make pin cap 6 retreat to the top dead center position that pin 1 is exposed fully.
Lower dead center has following function with sticking department 8: after pin cap 6 is pushed to its bottom dead center position that covers pin 1, pushes first half one side of described oscillation center P and make its swing, make the chimeric mutually and locking of sticking department, thereby guarantee that pin cap 6 is locked.
This sticking department 8 is made of recess 8-1 and protuberance 8-2, and its center dant 8-1 is located at the two sides of front end of narrow 2-2 of shank 2; Protuberance 8-2 is located at two surfaces, inboard of the rear end of the narrow groove 10 on the pin cap 6.After pin cap 6 is released forward from top dead center position, by first half one side (front of face portion 6-3) that is positioned at oscillation center P (protuberance 7-2) its swinging plane at shank 2 is swung by pressing cap 6, make the chimeric mutually and locking of protuberance 8-2 and recess 8-1, the pin cap 6 that covers pin 1 is locked (state of Fig. 4 (c)) effectively.
At this moment, float from shank 2 and it is swung in the swinging plane of shank 2, can remove this lock-out state (state of Fig. 4 (b)) with the latter half of side (rear end one side of face portion 6-3) of the pin cap 6 of its released state by pushing to be in.
Top dead centre has following function with sticking department 9: it is shaken and remove lower dead center with behind the lock-out state of sticking department 8 for pin cap 6 pushing a described latter half of side of shaking center P, pin 1 is pushed into the top dead center position that it is exposed fully, make its chimeric mutually and locking then, keep thereby pin 1 is locked in top dead center position ground.
Sticking department 9 is made of recess 9-1 and protuberance 9-2, and its center dant 9-1 is located at the two sides of front end of narrow 2-2 of shank 2; Protuberance 9-2 is located at two surfaces, inboard of the front end of the narrow groove 10 on the pin cap 6, by pin cap 6 upwards is pushed into after top dead center from bottom dead center position, makes protuberance 9-2 and recess 9-1 embed the merging locking mutually pin cap 6 is locked in top dead center position ground maintenance (state of Fig. 4 (a)) effectively.
At this moment, slide to bottom dead center position downwards from top dead center position, can remove this lock-out state (Fig. 4 (a) slides into the state of double dot dash line position by solid line position) by making pin cap 6.。
Below, explanation has the using method of the compasses that describe in detail in the present embodiment of aforementioned structure simply.
After compasses are finished using, with forefinger, middle finger with nameless shank 2 is held, the finger abdomen of thumb is placed anti-skidding 12 of face portion 6-3 of pin cap 6 (Fig. 4 (a) slides into the state of double dot dash line position by solid line position).Under this state, pin cap 6 is pushed into bottom dead center position (state shown in the solid line of Fig. 4 (a)) then, be fulcrum with oscillation center P (protuberance 7-2) again, make it in the swinging plane of shank 2, swing (state of the double dot dash line of Fig. 4 (b)) by first half one side of pressing cap 6.
Like this, the lower dead center of pin cap 6 embeds recess 8-1 and the locking of the lower dead center of shank 2 with sticking department 8 with the protuberance 8-2 of sticking department 8, and the pin cap 6 that covers pin 1 is whereby kept reliably because protuberance 8-2 is locked in the recess 8-1.
On the other hand, when using these compasses, foregoing such, hold shank 2, the finger abdomen of thumb is placed the latter half of side of the face portion 6-3 of the pin cap 6 that floats from shank 2, and making it is that fulcrum is swung (state that becomes (b) from the state of Fig. 4 (c)) in the swinging plane of shank 2 with oscillation center P (protuberance 7-2).
Like this, the lower dead center of pin cap 6 is deviate from from the recess 8-1 of lower dead center with sticking department 8 of shank 2 with the protuberance 8-2 of sticking department 8, thereby removes this lock-out state (Fig. 4 (b) becomes the solid line state by the double dot dash line state) of pin cap 6.
Next, under the state of the face portion 6-3 that thumb is placed pin cap 6, make pin cap 6 is pushed into top dead center position (becoming the state of (a) from the state of Fig. 4 (b)).
Like this, the top dead centre of pin cap 6 embeds recess 9-1 and the locking of the top dead centre of shank 2 with sticking department 9 with the protuberance 9-2 of sticking department 9, pin cap 6 is kept reliably because protuberance 8-2 is locked in the recess 8-1 whereby, and pin 1 is kept under the user mode that pin exposes.
In addition, as a reference, the present invention also can be designed to shown in Figure 5: offer a window 13 that roughly is inverted U-shaped on the needle point covering 6-1 of portion of pin cap 6 front ends, in this case, preferably make its such formation: when pin cap 6 is pushed to when making the top dead center position that pin 1 stretches out, window 13 can be with the narrow groove 10 of pin cap 6 the samely with narrow 2-2 tabling of shank 2 and make the lower surface of this narrow 2-2 mutually concordant with the lower surface of the shank 2 that has pin 1.
Different with the compasses that describe in detail in the foregoing description, Fig. 6 has showed the application examples of drafting instrument of the present invention in divider.Because its basic structure is identical with aforementioned structure, and same parts have used identical notes number, are not described in detail in this.
The drafting instrument of the compasses that have a pin of the present invention or divider and so on is formed with previous constructions, can produce following effect: among the present invention, owing to will stretch out that the pin of shank lower end covers and the operation of stretching out is by being the swing in the swinging plane of shank of fulcrum with oscillation center P and finishing in the such dual structure of the slip of above-below direction, thereby the gateway of coming in and going out for pin needn't must be set in the needle point covering portion of pin cap leading section as before.
Even producing the pin cap, the impact when instrument lands etc. accidentally motion, the also danger that does not exist pin from the pin cap, to stretch out such as retreats.
In addition, at the bottom dead center position of the pin cap that covers pin and the top dead center position that pin is stretched out, the pin cap is by such structure shank to be kept: mutual chimeric ground is provided with betwixt at upper and lower dead-centre position place to make pin cap and shank, the lower dead center locking mechanism, thereby the pin cap is natural and good to the state of holding tightly of shank.
In other words, because present embodiment does not adopt the rubbing surface structure in the conventional method, promptly, frictionally keeps on the pin cap, the position of lower dead center and cause the slip of above-below direction to send out puckery, just the pin cap can be assembled on the shank, so strength that need not be big, one-handed performance just can make the pin cap slide to bottom dead center position that pin is covered and the bottom dead center position that pin is exposed.
This shows, the present invention can improve the security and the usability of the drafting instrument that has pin of compasses or divider and so on, the adult certainly needless to say, even children such as pupil also can be simply and the pin cap is slided and pin are covered or it is exposed, even the fortuitous event that the generation instrument lands etc. accidentally can guarantee that also pin can not stretch out from the pin cap.