CN101430181A

CN101430181A - Tape braking mechanism

Info

Publication number: CN101430181A
Application number: CNA2007101565752A
Authority: CN
Inventors: 黄忠华; 田叶青
Original assignee: CHANGCHENG JINGGONG INDUSTRY Co Ltd NINGBO
Current assignee: CHANGCHENG JINGGONG INDUSTRY Co Ltd NINGBO
Priority date: 2007-11-08
Filing date: 2007-11-08
Publication date: 2009-05-13
Anticipated expiration: 2027-11-08
Also published as: CN101430181B

Abstract

A tape measure damping mechanism comprises a push button, a pawl, a tape measure shell, a center tape measure shell, and a tap measure core tray and is characterized in that the periphery of the center tape measure shell is rotatably connected with the pawl which can move right and left by a pawl axis. A torsional spring is arranged between the pawl and the center tape measure shell. One end of the pawl is matched with ratchets which are molded on the side surface of the tape measure core tray and distributed in a toroidal way. The other end of the pawl is matched with the contradiction position of the push button arranged in a push button hole at the side surface of the shell body. A spring is arranged between the push button and the shell body nearby the push button. The tape measure damping mechanism realizes automatic braking function of the long tape measure; and the push button is light and flexible; the braking and locking is reliable and stable, and is difficult to be broken.

Description

A kind of brake mechanism for tape measures

Technical field

The present invention relates to a kind of brake mechanism for tape measures.

Background technology

The braking of tape measure has multiple mode, the elastic deformation of the braking general using plastics of short chi (chi strip length 10M is following) is stopped the chi band, also have by stopping the chi core and reach the braking purpose, but these modes of braking generally all are manual, and long chi (more than the chi strip length 10M) is owing to the length reason of its chi band, do not realize reclaiming chi band function automatically by spring force, a lot of long chis can only design with hand and shake back the chi band, to my company's automatically recovery long ruler technological breakthrough, solve long chi and can not reclaim this difficult problem automatically, but also formed new problem simultaneously, that long exactly chi reclaims the chi band automatically by spring force, because the chi band of long chi is generally all more than 10M, want big so need the elastic force of spring, if still adopt short chi mode of braking that just do not reach effect same, the patent No. is: 02250914.3 discloses a kind of Braking mode tape measure, it is characterized in that: by the chi box, runner, clockwork spring, the chi band, button, constitute with reed, runner and button have gearing mesh. by the clutch of spring leaf control knob and runner, thereby reach the effect of Braking mode, its structure is suitable for short chi, and runner is installed on the mandrel, if this structure is used on the long chi, because the spring force of long chi is bigger, the power that consequently reacts on button is also quite big, causes button stressed also big, so button easily interrupts and uses inconvenience., also need better structure at long chi and realize the Braking mode effect.

Summary of the invention

Technical matters to be solved by this invention provides a kind of reliable firm, brake mechanism for tape measures of being not easy to break of long chi Braking mode function and button easy and flexible, braking and locking of having realized.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of brake mechanism for tape measures, it includes button and ratchet, the chi shell, middle chi shell, chi core dish, it is characterized in that: on the circumference of middle chi shell with pawl axis be connected with rotationally can about the action ratchet, between ratchet and the middle chi shell torsion spring is installed, one end of ratchet cooperates with the ratchet that annular distributes that is on being molded over chi core dish side, the other end of ratchet and button in being installed in housing side button hole contact the position and conflict and cooperate, and are provided with spring between the housing near button and the button hole.

As improvement, the button hole both sides are provided with back up pad, and two springs are supported on respectively between the back up pad of button and button hole side, make button actions more reliable and more stable.

Further improve, housing is divided into left and right installation cavity by middle shell with the cavity of housing, and wherein the chi spring is distributed in one and installs in the cavity, and chi core dish is distributed in another and installs in cavity, one end of driving mechanism is connected with an end of chi spring, and the other end of driving mechanism is connected with chi core dish.Employing chi spring and chi core dish separate the structure of design side by side, and be simple and reasonable, is fit to the chi band of long chi more, dwindles the diameter of chi shell greatly, is convenient to hold use, and, also assemble easily and produce.

Further improve, driving mechanism has comprised chi spring dish, transition gear and the gear that is fixed on chi core dish side, central shaft is set on the housing, chi spring dish is enclosed within on the central shaft, and be distributed in the installation cavity of chi spring, the side of chi spring dish is connected with an end of chi spring, the step-shaped transition gear is arranged on the middle chi shell-side face, and in the installation cavity of chi spring, the internal tooth of first gear of transition gear and chi spring dish is connected with a joggle, second gear of transition gear is connected with a joggle with the gear that extend in the chi spring installation cavity, and gear is installed on the central shaft in company with chi core dish.Adopt compact practical driving mechanism, both convenient ruler was taken back receipts, simultaneously can reduce recovery speed, avoid the incised wound finger, and adopt chi spring dish and transition gear fit structure, adapt with middle chi shell, both made things convenient for transition gear to install and use, simultaneously, can significantly reduce the wearing and tearing that the engagement of the annular wheel of transition gear and chi spring dish causes, compact conformation is reasonable.

At last, chi spring one end is to be plugged in the slot of the inboard face holder of chi shell, and the other end is to be plugged in the slot of chi spring dish side, is convenient to the assembling of chi spring like this and uses.

Compared with prior art, the invention has the advantages that: the annular distribution ratchet is molded over the side of chi core dish, and ratchet and ratchet are positioned on the circumference of central shaft, and diameter is bigger, and it is less that ratchet is accepted the torsion of chi core dish like this, is difficult for hurting ratchet; Another advantage of the present invention is that button does not contact ratchet under ratchet and the meshing state of ratchet, and ratchet power requirement to torsion spring under meshing state is very little like this, and the ratchet own wt is also very light, so the noise that ratchet and ratchet produced is very little; So obtained the effect that button easy and flexible, braking and locking are reliably firm, be not easy to break, one-piece construction is fairly simple, assembling is implemented easily, and cost is low.

Description of drawings

Fig. 1 is a whole explosive view of the present invention;

Fig. 2 is the meshing sectional view of clutch of the present invention;

Fig. 3 separates sectional view for clutch of the present invention;

Fig. 4 is a clutch front elevation of the present invention.

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Anticipate as shown in the figure, numbering is among the figure, 1. preceding chi shell, 2. back chi shell, 3. button, 4. chi core dish, 5. ratchet, 6. middle chi shell, 7. chi spring, 8 torsion springs, 9. chi spring dish, 10. transition gear, 11. central shafts, 12. the ratchet of annular distribution, 13. springs, 14. pawl axis, 15. button holes, I. gap

In present embodiment, during arrestment mechanism has adopted and has been fit to be installed on the Che shell arrestment mechanism, see Fig. 1, it is on the circumference of middle chi shell 6, normally near position, button hole 15 position, connect ratchet 5 rotationally with pawl axis 14, ratchet 5 is made the branch body structure with pawl axis 14, is fixed together then, be with torsion spring 8 on the pawl axis 14, one end of torsion spring 8 is supported in middle shell 6 sidewalls, and the other end is supported on ratchet 5 the insides, makes the ratchet 5 can left-right rotation.And the side of chi core dish 4 is distributed with unidirectional ratchet 12, and ratchet 12 presents annular distribution, utilizes plastics molding process and chi core dish 4 to be made of one.The ratchet 12 that annular distributes that is on one end of ratchet 5 and chi core dish 4 sides cooperates, the other end of ratchet 5 and button 3 in being installed in housing side button hole contact the position and conflict and cooperate, be provided with spring 13 between the housing near button 3 and the button hole, present embodiment, two springs 13 have been adopted, be supported on respectively between the back up pad 15a of button 3 and button hole side, and button 3 is limited in the button hole 15 by flange 3a, can not eject.

In order to use on long chi, housing is divided into left and right installation cavity by middle chi shell 6 with the cavity of housing, certainly, here and in not requiring chi shell 6 with about cavity be installed kept apart utterly, about cavity be installed be communicated with.In present embodiment, housing has adopted preceding chi shell 1 to cut apart installing plate with back chi shell 2 and with the centre and sidewall is made middle shell 6, chi shell 6 and forward and backward housing 1 like this, 2 involutory after, connect with screw, formed housing, chi shell 6 during wherein central shaft 11 crosses, two ends are fastened on the centre of procapsid 1 and back casing 2.The chi spring 7 of long chi is distributed in one and installs in the cavity, chi core dish 4 is distributed in another by central shaft 11 and installs in the cavity, because chi band and chi spring 7 are separately positioned in two chambers arranged side by side, rather than be wound on the inside chamber and the outside of chi core dish, so, can reduce the diameter of chi core dish greatly, also just dwindle the housing diameter of long chi, be convenient to people and hold use.Rotate for the action that makes the chi spring can drive chi core disc spins, so a driving mechanism must be arranged, an end of driving mechanism is connected with an end of chi spring 7, and the other end of driving mechanism is connected with chi core dish 4, sees Fig. 1.

In present embodiment, driving mechanism has adopted compact simple driving mechanism, see Fig. 1, it has comprised chi spring dish 9, transition gear 10 and the gear 12a that is fixed on chi core dish 12 sides, central shaft 11 is set on the housing, chi spring dish 9 is distributed in the installation cavity of chi spring, and be enclosed within on the central shaft 11 and can rotate rotation, chi spring dish 9 forms annular internal tooth (the figure meta draws), the side of chi spring dish 9 has slot 9a, it is fixedly connected that discoid chi spring 7 one ends are inserted among the slot 9a, as drive end, fix motionlessly before chi spring 7 other ends just are plugged in the slot of chi shell 1 inboard face holder, see Fig. 1, the side of chi shell 6 during step-shaped transition gear 10 is arranged on rotationally by pivot pin, and in the installation cavity of chi spring 7, the internal tooth of first gear of transition gear 10 and chi spring dish 9 is connected with a joggle, and second gear of transition gear 10 is connected with a joggle with the chi core dish 12 side gear 12a that extend in the chi spring installation cavity, and gear is installed on the central shaft 11 in company with chi core dish 12.Like this, when going out the chi band, chi core disc spins just can be passed through driving mechanism, the chi spring is tightened up carry out storage power, and the chi spring just can drive chi core dish to reverse when scattering owing to elastic reaction, and the chi band is recovered on the chi core dish automatically.

Its principle of work is such, as shown in the figure: when we will use tape measure, the chi band was drawn out, 4 rotations of chi core dish, ratchet 5 under torsion spring 8 effect with chi core dish 4 on annular distribution ratchet 12 meshing, ratchet 5 forms a unidirectional mechanism with chi core dish 4, when the chi band is drawn out, and the tight focused energy of chi spring 7 dishes, in this course, button 3 is not done any action, and button 3 does not contact with ratchet 5, and certain interval is arranged.When we will regain band tape, we press the button 3, make the annular distribution ratchet 12 on the ratchet 5 disengaging chi core dishes 4, chi core dish 4 is regained the chi band under the drive of transition gear 10, our release button 3, and ratchet 5 is under torsion spring 8 effects, depress once more, meshing with the annular distribution ratchet 12 on the chi core dish 4, stop chi core dish 4, so just reached the effect of Braking mode.

Claims

1, a kind of brake mechanism for tape measures, it includes button and ratchet, chi shell, middle chi shell, chi core dish, it is characterized in that: on the circumference of middle chi shell with pawl axis be connected with rotationally can about the action ratchet, between ratchet and the middle chi shell torsion spring is installed, one end of ratchet cooperates with the ratchet that annular distributes that is on being molded over chi core dish side, the other end of ratchet and button in being installed in housing side button hole contact the position and conflict and cooperate, and are provided with spring between the housing near button and the button hole.

2, brake mechanism for tape measures according to claim 1 is characterized in that the button hole both sides are provided with back up pad, and two springs are supported on respectively between the back up pad of button and button hole side.

3, brake mechanism for tape measures according to claim 1 and 2, it is characterized in that housing is divided into left and right installation cavity by middle shell with the cavity of housing, wherein the chi spring is distributed in the installation cavity, chi core dish is distributed in another and installs in the cavity, one end of driving mechanism is connected with an end of chi spring, and the other end of driving mechanism is connected with chi core dish.

4, brake mechanism for tape measures according to claim 3, it is characterized in that driving mechanism has comprised chi spring dish, transition gear and the gear that is fixed on chi core dish side, central shaft is set on the housing, chi spring dish is enclosed within on the central shaft, and be distributed in the installation cavity of chi spring, the side of chi spring dish is connected with an end of chi spring, the step-shaped transition gear is arranged on the middle chi shell-side face, and in the installation cavity of chi spring, the internal tooth of first gear of transition gear and chi spring dish is connected with a joggle, second gear of transition gear is connected with a joggle with the gear that extend in the chi spring installation cavity, and gear is installed on the central shaft in company with chi core dish.

5, brake mechanism for tape measures according to claim 4 is characterized in that chi spring one end is to be plugged in the slot of the inboard face holder of chi shell, and the other end is to be plugged in the slot of chi spring dish side.