CN109367294A - Pencil compass safety needle feet - Google Patents

Abstract

The invention discloses pencil compass safety needle feets, including safety needle, clamping close device, compasses determine head and compasses rotary head, it includes that compasses determine head shell that the compasses, which determine head, the compasses are determined to be equipped with storage belt wheel chamber in head shell, storage belt wheel hollow shaft is fixedly mounted on rear side of the storage belt wheel chamber on inner wall, syringe needle button pedestal is fixedly mounted in the storage belt wheel hollow shaft front end face, the syringe needle button lock chamber through the syringe needle button pedestal front end face is equipped in the syringe needle button pedestal, the fixed cavity wall of the syringe needle button is equipped with screw thread, the compasses determine head shell back end surface and determine head shell back end surface equipped with the compasses are run through, the syringe needle chamber of the storage belt wheel hollow shaft front/rear end and the syringe needle button pedestal back end surface, the syringe needle chamber extends forward to be connected to the syringe needle button lock chamber.

Description

Pencil compass safety needle feet

Technical field

The present invention relates to drafting instrument technical fields, specially pencil compass safety needle feet.

Background technique

Current compasses are very important drafting instrument, are active in mathematics and cartography, for drawing round or string, In addition to this also there are many more high-end skills and application method, but compasses possess the special tectonic of sharp needle due to it, with And the characteristic usually used in various teaching scenes, so that it has some potential safety problems, the same compasses of small lance can It can scratch or stab at unnecessary to artificial, it is therefore desirable to a kind of safer compasses for possessing safety needle feet.

Summary of the invention

The purpose of the present invention is to provide pencil compass safety needle feets, for overcoming drawbacks described above in the prior art.

The pencil compass safety needle feet of embodiment according to the present invention, including safety needle, clamping close device, compasses determine head and compasses Rotary head, it includes that compasses determine head shell that the compasses, which determine head, and the compasses are determined to be equipped with storage belt wheel chamber, the storage belt wheel chamber in head shell Storage belt wheel hollow shaft is fixedly mounted on rear side inner wall, syringe needle button pedestal is fixedly mounted in the storage belt wheel hollow shaft front end face, The syringe needle button lock chamber through the syringe needle button pedestal front end face, the syringe needle button are equipped in the syringe needle button pedestal Fixed cavity wall is equipped with screw thread, and the compasses determine head shell back end surface and determine head shell back end surface equipped with the compasses are run through, The syringe needle chamber of the storage belt wheel hollow shaft front/rear end and the syringe needle button pedestal back end surface, the syringe needle chamber prolong forward It stretches and is connected to the syringe needle button lock chamber, between the storage belt wheel chamber front inner wall and the syringe needle button pedestal back end surface Be rotatably assorted installation storage belt wheel, and the storage pulley power chamber through the storage belt wheel front/rear end is equipped in the storage belt wheel, described It stores up and storage belt wheel return spring, the storage belt wheel is fixedly mounted between pulley power cavity wall and the storage belt wheel hollow shaft end face outside End face outside is fixedly connected with tape, and the storage belt wheel end face outside is fixedly connected with storage band ratchet, the storage band ratchet and the circle Inner wall is slidably matched on rear side of regulation head shell, and connection is equipped with storage belt wheel limit chamber, the storage belt wheel limit on the left of the storage belt wheel chamber It is rotatably assorted on inner wall on rear side of the chamber of position and limiting card tooth shaft is installed, limiting card ring gear is fixedly connected in the limiting card tooth shaft, it is described Limiting card ring gear end face outside is fixedly connected with limit latch, and the limit latch is engaged with the storage band ratchet, the limiting card Bottom of the tooth end surface is fixedly connected with limit latch link, and the limit latch link bottom end face is fixedly connected with limit latch ball, the storage Connection is equipped with latch reseting cavity, the latch reseting cavity inner left wall and the limit latch ball in belt wheel limit chamber inner left wall Latch return spring is fixedly connected between left end face, the storage belt wheel limit chamber bottom wall, which is equipped with, determines head shell bottom through the compasses The latch of end surface resets mouth, and the latch resets the latch reset switch that is slidably installed in mouth, the latch reset switch Top end surface is fixedly connected with latch and resets gasket, and the latch resets gasket top end surface and latch resetting shaft is fixedly mounted, described Latch resetting shaft left end face is contacted with the limit latch ball right end face, and latch is fixedly mounted at the top of the latch resetting shaft Ball is resetted, the latch resets ball left end face and contacts with the limit latch link right end face, on the right side of the latch resetting shaft The latch restoring board of triangle is fixedly mounted, the latch restoring board resets gasket top end surface with the latch and is fixedly connected, The latch restoring board top end surface resets ball bottom end face with the latch and is fixedly connected, and connection is set above the storage belt wheel chamber There is tape turn mouth, connection is equipped with the tape first that head shell left end face is determined through the compasses on the left of the tape turn mouth Outlet is rotatably assorted before and after the tape turn mouth between inner wall and installs tape turn axis, the tape up extend with it is described Tape turn axis is slidably matched, and the tape is pierced by after the tape turn mouth from the tape first outlet.

Further technical solution, the safety needle include being threadedly engaged the syringe needle being mounted in the syringe needle button lock chamber Button module, the interior syringe needle button module chamber being equipped with through the syringe needle button module front/rear end of the syringe needle button module, Bilateral symmetry is equipped with the syringe needle button sliding cavity for being connected to the syringe needle button module chamber, institute in the syringe needle button module cavity wall The intracavitary syringe needle button that is slidably installed of syringe needle button module is stated, left and right pair is fixedly mounted in end face at left and right sides of the syringe needle button The syringe needle button limited block of title, the syringe needle button limited block are slidably matched with the syringe needle button sliding cavity, the syringe needle chamber Inside be slidably installed safe shank, and backshank gasket, the backshank gasket front side is fixedly mounted in the safe shank front end face End face is contacted with the syringe needle button front end face, and the syringe needle installation of opening backward is equipped in the safe shank back end surface Chamber, the syringe needle installation cavity is interior to be equipped with internal screw thread, and the syringe needle installation cavity screw-internal thread fit installs safe needle body, the safty pin Safety needle is fixedly mounted in body back end surface, and syringe needle limited block, the syringe needle limit is fixedly mounted in the syringe needle chamber inner left wall Syringe needle is fixedly mounted between block front end face and the safe shank back end surface and limits spring, equipped with the on the right side of the storage belt wheel chamber One switch cavity, first switch chamber right side connection is equipped with the switch mouth that head shell right end face is determined through the compasses, described Be slidably installed syringe needle switch in switch mouth, is equipped with second switch chamber, the second switch chamber on rear side of the first switch chamber Rear side connection is equipped with the syringe needle folding chamber through the syringe needle chamber right end face, and the syringe needle opens and closes the intracavitary needle that is slidably installed Head folding lid, intracavitary be slidably installed of the second switch switch drive block, and the switch drive block is hingedly coupled the Two drive rods, second drive rod and the syringe needle folding lid are articulated and connected, and the switch drive block is hingedly coupled the One drive rod, first drive rod and syringe needle switch are articulated and connected.

Further technical solution, the compasses rotary head include compasses rotary head shell, are equipped in the compasses rotary head shell The tape compensated cavity of annular is rotatably assorted before and after the tape compensated cavity between inner wall and installs tape auxiliary wheel, and the tape is auxiliary It helps and is equipped with penholder limit chamber on the right side of chamber, the penholder limit chamber front inner wall, which is equipped with, runs through the compasses rotary head shell front end face Penholder adjusting cavity, be connected between the penholder limit chamber and the penholder clamping chamber and be equipped with penholder limit module symmetrical above and below Mouthful, it is equipped with penholder in the penholder limit chamber and limits module, the penholder limit module left end face is fixedly connected symmetrical above and below Penholder limit plate, the penholder limit plate and the penholder limit module mouth are slidably matched, on the right side of the penholder limit module It is fixedly connected with penholder limit ramp, the penholder limit ramp back end surface is slidably matched with the penholder limit chamber antetheca, institute It states and penholder limit magnet is fixedly mounted in penholder limit ramp inclined-plane, inner wall, which is rotatably assorted, on rear side of the penholder limit chamber installs pen Bar limit shaft, the penholder limit shaft extend through forward the penholder adjusting cavity, the penholder limit shaft and the penholder tune Section chamber is slidably matched, and the penholder limit shaft front end face is fixedly connected with penholder and adjusts end, screw thread on the penholder limit shaft Mating connection penholder adjusting block, the penholder adjusting block right end face are slidably matched with the penholder limit chamber right end face, institute It states and penholder adjustment magnet is fixedly mounted in penholder adjusting block left end face, connection is equipped with symmetrical above and below on the right side of the tape compensated cavity And opening the first tape inlet port to the right, the outlet of the second tape, the tape pass through the first tape inlet port with it is described Tape auxiliary wheel is slidably matched, and the tape is pierced by by tape auxiliary wheel from second tape outlet, and the compasses determine head The second tape fixed block is fixedly mounted in shell left end face, the tape is fixedly connected with the second tape fixed block.

Further technical solution, the clamping close device include the card being installed in the compasses rotary head shell right end face It closing and operates chamber, connection operates mouth equipped with the engaging through the compasses rotary head shell right end face on the right side of the engaging running chamber, The engaging operates the intracavitary clamping block symmetrical above and below that is slidably installed, and the opposite side of the clamping block is equipped with symmetrical above and below Clamping block opening, engaging movement spring is fixedly connected between clamping block opening up and down, the compasses determine head shell left-hand end The first engaging chamber is equipped in face, connection is equipped with the second snap openings on the left of the first engaging chamber.

The beneficial effects of the present invention are: using the beneficial effects of the present invention are: the configuration of the present invention is simple, easy to operate When, device is firmly unpluged, clamping block is skidded off from the first engaging chamber by the second snap openings, pen is then packed into penholder dress In clip cavity, rotation adjusts penholder and adjusts end, and penholder adjusts end and penholder adjusting block is pushed to move up and down, and on penholder adjusting block Penholder adjustment magnet and penholder limit ramp on penholder limit magnet be tightly attracted, so that penholder be driven to limit module and pen Bar limit plate moves left and right, and penholder is tightly clamped, and stretches tape according to required radius length later, goes out from the second tape The scale of tape surface marking can be read at mouthful right-side outlet, limit latch passes through the limit that is limited by latch return spring when stretching Position latch ball and limit latch link tightly push down storage band ratchet, make its can not backwards rotation, up pull at this time syringe needle switch, Syringe needle switch will switch drive block by the first drive rod and drive, and switch drive block is past by syringe needle folding lid by the second drive rod The right side retracts, and syringe needle is open and is opened, pins syringe needle button at this time, pushes backshank gasket and safe shank, peace with syringe needle button Full shank pushes safety needle down, stretches out it and lives the center of circle depending on, and then a hand pins syringe needle button, and another is held The pen being firmly fixed on compasses rotary head shell, draws complete circle, and when withdrawing, release of needle button, syringe needle limit spring first It pushes safety needle to return in syringe needle chamber, then pulls syringe needle switch down, drive switch drive block past by the first drive rod Front slide, switch drive block push syringe needle folding lid to be closed toward front slide by the second drive rod, push card of turning left at this time Tooth reset switch, latch reset switch, which by latch resets gasket latch resetting shaft and latch is driven to reset ball, turns left sliding, blocks Tooth resetting shaft and latch reset ball, which are turned left, to be pushed limit latch ball open and limits latch link and limit the limit that latch link is connected Latch, at this time by the elastic force of storage belt wheel return spring, tape is withdrawn, then rotates backward penholder adjustable side by storage belt wheel revolution Head, which is turned right, drives penholder limit plate to withdraw pen, and the mechanism being open using clamping block, clamping block is plunged into the second snap openings and the In one engaging chamber, the configuration of the present invention is simple is easy to operate, substantially reduces security risk, plane by the push type syringe needle that stretches Space needed for the unitary design of type reduces storage, makes to carry more convenient, and invention is novel, and market prospects are good, are worth pushing away Extensively.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of compasses rotary head of the present invention；

Fig. 2 is the structural schematic diagram that compasses of the present invention determine head；

Fig. 3 is the schematic cross-sectional view in Fig. 1 at A；

Fig. 4 is the schematic cross-sectional view in Fig. 2 at B.

Specific embodiment

Below with reference to Fig. 1-4, the present invention is described in detail, for sake of convenience, now such as to hereafter described orientation regulation Under: hereafter described front-rear direction up and down is consistent with the front-rear direction up and down of Fig. 1 projection relation itself.

Referring to Fig.1-4, the pencil compass safety needle feet of embodiment according to the present invention, including safety needle, clamping close device, compasses Determine head and compasses rotary head, it includes that compasses determine head shell 40 that the compasses, which determine head, and the compasses are determined to be equipped with storage belt wheel in head shell 40 Storage belt wheel hollow shaft 63,63 front side end of storage belt wheel hollow shaft are fixedly mounted on the 44 rear side inner wall of storage belt wheel chamber for chamber 44 Syringe needle button pedestal 70 is fixedly mounted in face, is equipped in the syringe needle button pedestal 70 and runs through 70 front end face of syringe needle button pedestal Syringe needle button lock chamber 71,71 inner wall of syringe needle button lock chamber is equipped with screw thread, and the compasses determine 40 rear side end of head shell Face, which is equipped with, determines 40 back end surface of head shell through the compasses, and 63 front/rear end of storage belt wheel hollow shaft and the syringe needle are pressed The syringe needle chamber 64 of 70 back end surface of button pedestal, the syringe needle chamber 64 extends forward to be connected to the syringe needle button lock chamber 71, institute The installation storage belt wheel 61 that is rotatably assorted between storage 44 front inner wall of belt wheel chamber and 70 back end surface of syringe needle button pedestal is stated, it is described Store up the storage pulley power chamber 92 being equipped in belt wheel 61 through storage 61 front/rear end of belt wheel, 92 inner wall of storage pulley power chamber Storage belt wheel return spring 62 is fixedly mounted between 63 end face outside of storage belt wheel hollow shaft, 61 end face outside of storage belt wheel is solid Surely tape 60 is connected, 61 end face outside of storage belt wheel is fixedly connected with storage band ratchet 45, the storage band ratchet 45 and the compasses Determine 40 rear side inner wall of head shell to be slidably matched, connection is equipped with storage belt wheel limit chamber 52, the storage band on the left of the storage belt wheel chamber 44 It is rotatably assorted on wheel 52 rear side inner wall of limit chamber and limiting card tooth shaft 53 is installed, be fixedly connected with limiting card in the limiting card tooth shaft 53 Ring gear 54,54 end face outside of limiting card ring gear are fixedly connected with limit latch 59, the limit latch 59 and the storage band spine 45 engagement of wheel, 59 bottom end face of limit latch are fixedly connected with limit latch link 58,58 bottom end face of limit latch link It is fixedly connected with limit latch ball 57, connection is equipped with latch reseting cavity 55, the card in 52 inner left wall of storage belt wheel limit chamber Latch return spring 56, the storage band are fixedly connected between 55 inner left wall of tooth reseting cavity and 57 left end face of limit latch ball Wheel 52 bottom wall of limit chamber, which is equipped with, resets mouth 47 through the latch that the compasses determine 40 bottom end face of head shell, and the latch resets mouth Be slidably installed latch reset switch 50 in 47, and 50 top end surface of latch reset switch is fixedly connected with latch and resets gasket 51, the latch resets 51 top end surface of gasket and is fixedly mounted latch resetting shaft 49,49 left end face of latch resetting shaft with 57 right end face of limit latch ball contacts, and latch is fixedly mounted at the top of the latch resetting shaft 49 and resets ball 46, the card Tooth resets 46 left end face of ball and contacts with 58 right end face of limit latch link, is fixedly mounted on the right side of the latch resetting shaft 49 The latch restoring board 48 of triangle, the latch restoring board 48 reset 51 top end surface of gasket with the latch and are fixedly connected, institute It states 48 top end surface of latch restoring board to be fixedly connected with latch reset 46 bottom end face of ball, connect above the storage belt wheel chamber 44 Logical to be equipped with tape turn mouth 43, connection, which is equipped with, on the left of the tape turn mouth 43 determines 40 left end face of head shell through the compasses Tape first outlet 41, be rotatably assorted between the 43 front and back inner wall of tape turn mouth and tape turn axis 42, the ruler be installed Band 60 up extends to be slidably matched with the tape turn axis 42, and the tape 60 is after the tape turn mouth 43 from described Tape first outlet 41 is pierced by.

Valuably or illustratively, the safety needle includes being threadedly engaged the needle being mounted in the syringe needle button lock chamber 71 Head button module 93, the interior syringe needle button being equipped with through 93 front/rear end of syringe needle button module of the syringe needle button module 93 Cavity block 73, the interior bilateral symmetry of 73 inner wall of syringe needle button module chamber are equipped with the syringe needle for being connected to the syringe needle button module chamber 73 Button sliding cavity 74, be slidably installed in the syringe needle button module chamber 73 syringe needle button 72, the syringe needle button 72 or so Symmetrical syringe needle button limited block 75, the syringe needle button limited block 75 and the syringe needle button is fixedly mounted in both sides of the face Sliding cavity 74 is slidably matched, and be slidably installed safe shank 77 in the syringe needle chamber 64, safe 77 front end face of shank Backshank gasket 76 is fixedly mounted, 76 front end face of backshank gasket is contacted with 72 front end face of syringe needle button, the peace It is equipped with the syringe needle installation cavity 94 of opening backward in 77 back end surface of full shank, is equipped with internal screw thread, institute in the syringe needle installation cavity 94 It states 94 screw-internal thread fit of syringe needle installation cavity and safe needle body 78 is installed, safety needle is fixedly mounted in safe 78 back end surface of needle body 88, syringe needle limited block 90,90 front end face of syringe needle limited block and the peace is fixedly mounted in 64 inner left wall of syringe needle chamber Syringe needle is fixedly mounted between 77 back end surface of full shank and limits spring 89, is equipped with first switch chamber 79 on the right side of the storage belt wheel chamber 44, Connection is equipped with the switch mouth 81 that 40 right end face of head shell is determined through the compasses, the switch on the right side of the first switch chamber 79 Be slidably installed syringe needle switch 80 in mouth 81, is equipped with second switch chamber 86 on rear side of the first switch chamber 79, described second opens Connection is equipped with the syringe needle folding chamber 85 through 64 right end face of syringe needle chamber on rear side of close cavity 86, and the syringe needle opens and closes sliding in chamber 85 It is dynamic to be coupled syringe needle folding lid 87, it is slidably installed in the second switch chamber 86 and switchs drive block 83, the switch passes Motion block 83 is hingedly coupled the second drive rod 84, and second drive rod 84 is articulated and connected with the syringe needle folding lid 87, institute It states switch drive block 83 and is hingedly coupled the first drive rod 82, first drive rod 82 hingedly connects with the syringe needle switch 80 It connects, so that syringe needle stretching is functioned by pressing indentor point button 72 when using compasses, needle when not in use Head limit spring 89 retracts safety needle 88 automatically, can open and close syringe needle folding lid 87 by syringe needle switch 80, reduce safety Hidden danger.

Valuably or illustratively, the compasses rotary head includes compasses rotary head shell 10, in the compasses rotary head shell 10 Equipped with annular tape compensated cavity 13, it is rotatably assorted between the 13 front and back inner wall of tape compensated cavity and tape auxiliary wheel 12 is installed, Penholder limit chamber 26 is equipped on the right side of the tape compensated cavity 13,26 front inner wall of penholder limit chamber, which is equipped with, runs through the compasses The penholder adjusting cavity 95 of 10 front end face of rotary head shell is connected between the penholder limit chamber 26 and the penholder clamping chamber 14 and sets There is penholder limit module mouth 24 symmetrical above and below, penholder is equipped in the penholder limit chamber 26 and limits module 25, the penholder limit Position 25 left end face of module is fixedly connected with penholder limit plate 15 symmetrical above and below, and the penholder limit plate 15 is limited with the penholder Module mouth 24 is slidably matched, and penholder limit ramp 27 is fixedly connected on the right side of the penholder limit module 25, and the penholder limits slope 27 back end surface of plate is slidably matched with 26 antetheca of penholder limit chamber, and pen is fixedly mounted in 27 inclined-plane of ramp in the penholder limit Bar limits magnet 28, and the 26 rear side inner wall of penholder limit chamber, which is rotatably assorted, installs penholder limit shaft 29, the penholder limit shaft 29 extend through forward the penholder adjusting cavity 95, and the penholder limit shaft 29 is slidably matched with the penholder adjusting cavity 95, institute It states 29 front end face of penholder limit shaft and is fixedly connected with penholder adjusting end 32, be threadedly engaged connecting pen on the penholder limit shaft 29 Bar adjusting block 30,30 right end face of penholder adjusting block are slidably matched with 26 right end face of penholder limit chamber, the pen Penholder is fixedly mounted in 30 left end face of bar adjusting block and adjusts magnet 31, connection is equipped with right up and down on the right side of the tape compensated cavity 13 Claim and opening the first tape inlet port 11 to the right, the second tape outlet 17, the tape 60 pass through first tape entrance Mouth 11 is slidably matched with the tape auxiliary wheel 12, and the tape 60 exports 17 from second tape by tape auxiliary wheel 12 It is pierced by, the compasses determine that the second tape fixed block 91 is fixedly mounted in 40 left end face of head shell, the tape 60 and described the Two tape fixed blocks 91 are fixedly connected, and are worked to clamp penholder by penholder limit plate 15.

Valuably or illustratively, the clamping close device includes being installed in 10 right end face of compasses rotary head shell Engaging running chamber 19, the engaging operate connection on the right side of chamber 19 and are equipped with the engaging through 10 right end face of compasses rotary head shell Mouth 20 is operated, the engaging operates the clamping block 21 for being slidably installed symmetrical above and below in chamber 19, and the clamping block 21 is opposite Side is equipped with clamping block opening 22 symmetrical above and below, is fixedly connected with engaging movement spring 23 between the clamping block opening 22 up and down, The compasses are determined to be equipped with the first engaging chamber 36 in 40 left end face of head shell, and connection is equipped with second on the left of the first engaging chamber 36 Snap openings 35, so as to facilitate preservation can be fastened togather device when not used.

When use, device is firmly unpluged, keeps clamping block 21 sliding from the first engaging chamber 36 by the second snap openings 35 Out, then pen is fitted into penholder clamping chamber 14, rotation adjusts penholder and adjusts end 32, and penholder adjusts end 32 and pushes penholder tune Locking nub 30 moves up and down, and the penholder on the penholder adjustment magnet 31 and penholder limit ramp 27 on penholder adjusting block 30 limits magnetic Iron 28 is tightly attracted, so that penholder limit module 25 and penholder limit plate 15 be driven to move left and right, penholder is tightly clamped, later Tape 60 is stretched according to required radius length, 60 surface of tape can be read from 17 right-side outlets of the second tape outlet and carved The scale of print, limit latch 59 is tight by the limit latch ball 57 and limit latch link 58 limited by latch return spring 56 when stretching It is tight to push down storage band ratchet 45, make its can not backwards rotation, up pull syringe needle switch 80 at this time, syringe needle switch 80 passes through first Drive rod 82 drives drive block 83 is switched, and switch drive block 83 is turned right syringe needle folding lid 87 drawing by the second drive rod 84 It returns, syringe needle is open and is opened, pins syringe needle button 72 at this time, push backshank gasket 76 and safe shank with syringe needle button 72 77, safe shank 77 pushes safety needle 88 down, stretches out it and lives the center of circle depending on, then a hand pins syringe needle button 72, another hand holds the pen being fixed on compasses rotary head shell 10, draws complete circle, when withdrawing, release of needle first Button 72, syringe needle limit spring 89 push safety needle 88 to return in syringe needle chamber 64, syringe needle switch 80 are then pulled down, by the One drive rod 82 drives switch drive block 83 toward front slide, switchs drive block 83 by the second drive rod 84 and pushes syringe needle folding lid 87 are closed toward front slide, turn left push latch reset switch 50 at this time, and latch reset switch 50 resets gasket by latch 51 drive latch resetting shafts 49 and latch reset ball 46 and turn left sliding, and latch resetting shaft 49 and latch reset ball 46 turn left and push limit open The limit latch 59 that position latch ball 57 and limit latch link 58 and limit latch link 58 are connected, resets by storage belt wheel at this time The elastic force of spring 62, storage belt wheel 61 turn round, tape 60 are withdrawn, and then rotate backward penholder and adjust end 32 and turn right penholder is driven to limit Position plate 15 withdraws pen, using clamping block 21, the mechanism of clamping block opening 22, is plunged into the second snap openings 35 and the first engaging chamber In 36.

The beneficial effects of the present invention are: the configuration of the present invention is simple, easy to operate, when use, device firmly unpluged, is made Clamping block is skidded off from the first engaging chamber by the second snap openings, then pen is fitted into penholder clamping chamber, rotation adjusts penholder End is adjusted, penholder adjusts end and penholder adjusting block is pushed to move up and down, and penholder adjustment magnet and pen on penholder adjusting block Penholder limit magnet on bar limit ramp is tightly attracted, so that penholder limit module and penholder limit plate is driven to move left and right, Penholder is tightly clamped, tape is stretched according to required radius length later, it can be with from the second tape outlet right-side outlet The scale for reading the marking of tape surface, limit latch passes through the limit latch ball and limiting card that are limited by latch return spring when stretching Ratch tightly push down storage band ratchet, make its can not backwards rotation, up pull at this time syringe needle switch, syringe needle switch pass through first Drive rod will switch drive block and drive, and switch drive block, which is turned right syringe needle folding lid by the second drive rod, to be retracted, and syringe needle is opened Mouth is opened, and pins syringe needle button at this time, pushes backshank gasket and safe shank, safe shank to push peace down with syringe needle button Full syringe needle stretches out it and lives the center of circle depending on, and then a hand pins syringe needle button, and another hand, which is held, is fixed on compasses rotary head Pen on shell draws complete circle, and when withdrawing, release of needle button, syringe needle limit spring push safety needle to return to first In syringe needle chamber, syringe needle switch is then pulled down, is driven switch drive block toward front slide by the first drive rod, is switched drive block It pushes syringe needle folding lid to be closed toward front slide by the second drive rod, turns left push latch reset switch at this time, latch is multiple Bit switch, which by latch resets gasket latch resetting shaft and latch is driven to reset ball, turns left sliding, latch resetting shaft and latch reset Ball, which is turned left, to be pushed limit latch ball open and limits latch link and limit the limit latch that latch link is connected, at this time by storage belt wheel The elastic force of return spring, storage belt wheel revolution, tape is withdrawn, and is then rotated backward penholder and is adjusted end and turns right and drive penholder limit plate Pen is withdrawn, the mechanism being open using clamping block, clamping block is plunged into the second snap openings and the first engaging chamber, knot of the present invention Structure is simple, easy to operate, substantially reduces security risk by the push type syringe needle that stretches, the unitary design of plane reduces Space needed for storage, makes to carry more convenient, and invention is novel, and market prospects are good, are worthy to be popularized.

Those skilled in the art can define, can in the case of not departing from overall spirit of the invention and design To make the various modifications for above embodiments.It falls within the scope of protection of the present invention.Protection scheme of the invention It is subject to claims appended hereto.

Claims (4)

1. pencil compass safety needle feet, including safety needle, clamping close device, compasses determine head and compasses rotary head, it is characterised in that: the circle Regulation head includes that compasses determine head shell, and the compasses are determined to be equipped with storage belt wheel chamber in head shell, on rear side of the storage belt wheel chamber on inner wall Storage belt wheel hollow shaft is fixedly mounted, syringe needle button pedestal is fixedly mounted in the storage belt wheel hollow shaft front end face, and the syringe needle is pressed The syringe needle button lock chamber through the syringe needle button pedestal front end face, the fixed cavity wall of the syringe needle button are equipped in button pedestal Equipped with screw thread, the compasses determine head shell back end surface and determine head shell back end surface, the storage belt wheel equipped with the compasses are run through The syringe needle chamber of hollow shaft front/rear end and the syringe needle button pedestal back end surface, the syringe needle chamber extend forward and the needle Head button lock chamber connection, be rotatably assorted peace between the storage belt wheel chamber front inner wall and the syringe needle button pedestal back end surface Dress storage belt wheel, the storage belt wheel is interior to be equipped with the storage pulley power chamber through the storage belt wheel front/rear end, the storage pulley power Storage belt wheel return spring is fixedly mounted between cavity wall and the storage belt wheel hollow shaft end face outside, the storage belt wheel end face outside is solid Surely tape is connected, the storage belt wheel end face outside is fixedly connected with storage band ratchet, and the storage band ratchet and the compasses determine head shell Rear side inner wall is slidably matched, and connection, which is equipped with, on the left of the storage belt wheel chamber stores up belt wheel limit chamber, in the storage belt wheel limit chamber rear side It is rotatably assorted on wall and limiting card tooth shaft is installed, limiting card ring gear, the limiting card ring gear are fixedly connected in the limiting card tooth shaft End face outside is fixedly connected with limit latch, and the limit latch is engaged with the storage band ratchet, the limiting card bottom of the tooth end surface It is fixedly connected with limit latch link, the limit latch link bottom end face is fixedly connected with limit latch ball, the storage belt wheel limit chamber Connection is equipped with latch reseting cavity in inner left wall, the latch reseting cavity inner left wall and the limit latch ball left end face it Between be fixedly connected with latch return spring, the storage belt wheel limit chamber bottom wall is equipped with the card that head outer casing bottom end face is determined through the compasses Tooth resets mouth, and the latch resets the latch reset switch that is slidably installed in mouth, and the latch reset switch top end surface is solid Surely latch reset pad piece is connected, the latch resets gasket top end surface and latch resetting shaft, the latch resetting shaft is fixedly mounted Left end face is contacted with the limit latch ball right end face, and latch is fixedly mounted at the top of the latch resetting shaft and resets ball, institute It states latch reset ball left end face to contact with the limit latch link right end face, three is fixedly mounted on the right side of the latch resetting shaft Angular latch restoring board, the latch restoring board reset gasket top end surface with the latch and are fixedly connected, and the latch is multiple Position plate top end surface resets ball bottom end face with the latch and is fixedly connected, and connection is equipped with tape and turns round above the storage belt wheel chamber Mouthful, connection is equipped with the tape first outlet that head shell left end face is determined through the compasses on the left of the tape turn mouth, described It is rotatably assorted between inner wall before and after tape turn mouth and tape turn axis is installed, the tape up extends and the tape turn axis It is slidably matched, the tape is pierced by after the tape turn mouth from the tape first outlet.

2. pencil compass safety needle feet according to claim 1, it is characterised in that: the safety needle includes being threadedly engaged installation Syringe needle button module in the syringe needle button lock chamber, interior be equipped with of the syringe needle button module run through the syringe needle button mould The syringe needle button module chamber of block front/rear end, the interior bilateral symmetry of the syringe needle button module cavity wall are equipped with the connection syringe needle and press The syringe needle button sliding cavity of button cavity block, the intracavitary syringe needle button that is slidably installed of the syringe needle button module, the syringe needle are pressed Symmetrical syringe needle button limited block is fixedly mounted in end face at left and right sides of button, and the syringe needle button limited block is pressed with the syringe needle Button sliding cavity is slidably matched, the intracavitary safe shank that is slidably installed of the syringe needle, the fixed peace of safe shank front end face Backshank gasket is filled, the backshank gasket front end face is contacted with the syringe needle button front end face, the safe shank rear side end It is equipped with the syringe needle installation cavity of opening backward in face, is equipped with internal screw thread, the syringe needle installation cavity internal screw thread in the syringe needle installation cavity It is coupled safe needle body, safety needle is fixedly mounted in the safe needle body back end surface, and the syringe needle chamber inner left wall is fixed Syringe needle limited block is installed, syringe needle limit is fixedly mounted between the syringe needle limited block front end face and the safe shank back end surface Position spring is equipped with first switch chamber on the right side of the storage belt wheel chamber, and connection is equipped on the right side of the first switch chamber determines through the compasses The switch mouth of head shell right end face, be slidably installed in the switch mouth syringe needle switch, and the first switch chamber rear side is set There is second switch chamber, connection is equipped with the syringe needle folding chamber through the syringe needle chamber right end face, institute on rear side of the second switch chamber It states syringe needle and opens and closes the intracavitary syringe needle folding lid that is slidably installed, intracavitary be slidably installed of the second switch switchs drive block, The switch drive block is hingedly coupled the second drive rod, and second drive rod and the syringe needle folding lid are articulated and connected, The switch drive block is hingedly coupled the first drive rod, and first drive rod and syringe needle switch are articulated and connected.

3. pencil compass safety needle feet according to claim 1, it is characterised in that: the compasses rotary head includes compasses rotary head shell Body, the compasses rotary head shell is interior to be equipped with annular tape compensated cavity, is rotatably assorted between inner wall before and after the tape compensated cavity Tape auxiliary wheel is installed, penholder limit chamber is equipped on the right side of the tape compensated cavity, the penholder limit chamber front inner wall is equipped with and passes through The penholder adjusting cavity for wearing the compasses rotary head shell front end face, is connected between the penholder limit chamber and the penholder clamping chamber Module mouth is limited equipped with penholder symmetrical above and below, penholder is equipped in the penholder limit chamber and limits module, the penholder limits mould Block left end face is fixedly connected with penholder limit plate symmetrical above and below, the penholder limit plate and penholder limit module mouth sliding Cooperation, is fixedly connected with penholder limit ramp on the right side of penholder limit module, the penholder limit ramp back end surface with it is described Penholder limit chamber antetheca is slidably matched, and penholder is fixedly mounted in penholder limit ramp inclined-plane and limits magnet, the penholder limit Inner wall, which is rotatably assorted, on rear side of the chamber of position installs penholder limit shaft, and the penholder limit shaft extends through forward the penholder adjusting cavity, The penholder limit shaft is slidably matched with the penholder adjusting cavity, and the penholder limit shaft front end face is fixedly connected with penholder adjusting End is threadedly engaged connection penholder adjusting block, the penholder adjusting block right end face and the penholder on the penholder limit shaft Limit chamber right end face is slidably matched, and penholder is fixedly mounted in the penholder adjusting block left end face and adjusts magnet, the tape The first tape inlet port being equipped with symmetrical above and below and opening to the right, the outlet of the second tape are connected on the right side of compensated cavity, the tape is worn It crosses the first tape inlet port to be slidably matched with the tape auxiliary wheel, the tape passes through tape auxiliary wheel from described second Tape outlet is pierced by, and the compasses determine the second tape fixed block of fixed installation in head shell left end face, the tape with it is described Second tape fixed block is fixedly connected.

4. pencil compass safety needle feet according to claim 1, it is characterised in that: the clamping close device includes being installed in the circle It advises the engaging in rotary head shell right end face and operates chamber, connection, which is equipped with, on the right side of the engaging running chamber runs through the compasses rotary head shell The engaging of body right end face operates mouth, and the engaging operates the intracavitary clamping block symmetrical above and below that is slidably installed, the engaging The opposite side of block is equipped with clamping block symmetrical above and below and is open, and is fixedly connected with engaging movement between the clamping block opening up and down Spring, the compasses are determined to be equipped with the first engaging chamber in head shell left end face, and connection is equipped with the second card on the left of the first engaging chamber It heals up.