CN104139651A

CN104139651A - Gear compasses

Info

Publication number: CN104139651A
Application number: CN201410312185.XA
Authority: CN
Inventors: 郭南初; 李宝友; 高琨; 王浩然
Original assignee: Suzhou Vocational University
Current assignee: Suzhou Vocational University
Priority date: 2014-07-03
Filing date: 2014-07-03
Publication date: 2014-11-12
Anticipated expiration: 2034-07-03
Also published as: CN104139651B

Abstract

The invention discloses a pair of gear compasses. The pair of gear compasses comprises a tape box, a pen cap and a base, wherein the tape box is arranged on the base, and a tape is mounted in the tape box; the pen cap is connected with the tape, and the pen cap rotates around the center of the base under the constraint of the tape; the tape box comprises an upper shell, a lower shell, a rope rolling wheel, a volute spiral spring and a locking mechanism; the lower shell is arranged on the base, and the upper shell is connected and fixed with the lower shell; the volute spiral spring is respectively connected with the lower shell and the rope rolling wheel, and the tape is arranged on the rope rolling wheel; the locking mechanism comprises a shaft gear, a connecting rod gear, a limiting gear and a clamping piece; the shaft gear is fixed on the rope rolling wheel, and the limiting gear and the clamping piece are correspondingly arranged on the upper shell; the connecting rod gear is axially connected and fixed with the limiting gear, and the connecting rod gear is engaged with the shaft gear. Through the manner, the gear compasses can effectively set the semi-diameter, and is easy to operate, convenient for drawing a circle and easy to carry and store.

Description

A kind of gear compasses

Technical field

The present invention relates to drawing tools field, particularly relate to a kind of gear compasses.

Background technology

In existing compasses, mostly be chevron shaped, pin is fixed on blackboard as fulcrum, fixes chalk and justify on another pin, but make fulcrum with a pin, it easily slides in the process of drawing.A kind of rope compasses of announcing at present, application number: 201310185695.0, comprise fill suctorial base, there is the flexible rule box of stuck function, the pen cap of adjustable prolongation; Described flexible rule box is installed on base; On the described pen cap, be provided with roller, and described roller is connected with the tape measure in flexible rule box, and can be around base central rotation under the effect of tape measure, and then realized the function of drawing circle.But stuck device is by the pressure of spring, tape measure to be blocked, easy so loosening, radius in drawing course is changed, accuracy is poor.

Summary of the invention

The technical problem that the present invention mainly solves is to provide a kind of gear compasses, and effectively radii fixus, simple to operate, draws circle convenient, and compasses build is light and handy, is easy to carry and takes care of.

For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of gear compasses are provided, comprise: flexible rule box, the pen cap and base; Described flexible rule box is located on base, and tape measure is housed in flexible rule box; The described pen cap is connected with tape measure, and the pen cap under the constraint of tape measure around described base central rotation; Described flexible rule box comprises upper casing, lower casing, reel, scroll spring and lockable mechanism; Described lower casing is arranged on described base, and described upper casing and lower casing are connected and fixed; Described scroll spring is connected with described lower casing and reel respectively, and described tape measure is arranged on reel; Described lockable mechanism comprises shaft gear, link gear, position limited gear and fastener; Described shaft gear is fixed on described reel, and the mutual correspondence of described position limited gear and fastener is arranged on described upper casing; Described link gear and position limited gear are axially connected and fixed, and link gear engages with described shaft gear.

Preferably, described base is provided with central shaft; Described lower casing comprises lower house and the cylindrical sleeve that is fixed on lower house center, and described lower casing is enclosed within by cylindrical sleeve on the central shaft of described base; Described reel is enclosed within described cylindrical sleeve, and described scroll spring one end is fixed in cylindrical sleeve, and the other end is connected with described reel; Described tape measure is on described reel, and tape measure one end and reel are fixed, and tape measure can be by driving reel to shrink scroll spring; Described shaft gear is enclosed within described cylindrical sleeve, and shaft gear and described reel are fixed.

Preferably, described link gear is arranged on the below of described upper casing, and the connecting rod of link gear is through upper casing; Described position limited gear is arranged on upper casing top, and position limited gear is fixed on the connecting rod of described link gear; On described upper casing, on the position of corresponding described position limited gear, have chute, described fastener is arranged in chute; Described fastener is provided with projection, and fastener slides in chute and the projection of fastener can be against the between cog of described position limited gear.

Preferably, described base bottom is fixed with magnet, and the central shaft upper end of base has draw-in groove, is provided with check ring in draw-in groove; The central shaft of described base stretches out in described upper casing, and draw-in groove coordinates described flexible rule box is stuck on described central shaft with check ring.

The invention has the beneficial effects as follows: the present invention is radii fixus effectively, simple to operate, is easy to carry.

Brief description of the drawings

Fig. 1 is the main TV structure schematic diagram of a kind of gear compasses of the present invention;

Fig. 2 be shown in a kind of plan structure schematic diagram of gear compasses;

Fig. 3 be shown in a kind of gear compasses analyse and observe perspective view;

Fig. 4 be shown in a kind of exploded perspective view of gear compasses;

In accompanying drawing, the mark of each parts is as follows: 1, base; 2, upper casing; 3, lower casing; 4, central shaft; 5, check ring; 6, fastener; 7, position limited gear; 8, link gear; 9, shaft gear; 10, reel; 11, cylindrical sleeve; 12, tape measure; 13, scroll spring.

Detailed description of the invention

Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made to more explicit defining.

Refer to Fig. 1 to Fig. 4, the embodiment of the present invention comprises:

A kind of gear compasses, comprising: flexible rule box, the pen cap and the base 1 with magnet, and base is provided with central shaft 4, and central shaft 4 upper ends have draw-in groove, are provided with check ring 5 in draw-in groove; The central shaft 4 of described base 1 stretches out in described flexible rule box, and draw-in groove coordinates with check ring 5 described flexible rule box is stuck on described central shaft 4; Described flexible rule box is located on base 1, and tape measure 12 is housed in flexible rule box; The described pen cap is connected with tape measure 12, and the pen cap rotates around described central shaft 4 under the constraint of tape measure 12; Described flexible rule box comprises upper casing 2, lower casing 3, reel 10, scroll spring 13 and lockable mechanism; Described lower casing 3 comprises lower house and the cylindrical sleeve 11 that is fixed on lower house center, and described lower casing 3 is enclosed within by cylindrical sleeve 11 on the central shaft 4 of described base 1, and described upper casing 2 is connected and fixed with lower casing 3; Described reel 10 is enclosed within described cylindrical sleeve 11, and described scroll spring 13 one end are fixed in cylindrical sleeve 11, and the other end is connected with described reel 10; Described tape measure 12 is on described reel 10, and tape measure 12 one end and reel 10 are fixing, and tape measure 12 can be by driving reel 10 to shrink scroll spring 13; Described lockable mechanism comprises shaft gear 9, link gear 8, position limited gear 7 and fastener 6; Described shaft gear 9 is enclosed within described cylindrical sleeve 11, and shaft gear 9 is fixing with described reel 10; Described link gear 8 is arranged on the below of described upper casing 2, and the connecting rod of link gear 8 is through upper casing 2; Described position limited gear 7 is arranged on upper casing 2 tops, and position limited gear 7 is fixed on the connecting rod of described link gear 8; On described upper casing 2, on the position of corresponding described position limited gear 7, have chute, described fastener 6 is arranged in chute; Described fastener 6 is provided with projection, and fastener 6 slides in chute and the projection of fastener can be against the between cog of described position limited gear 7, and described link gear 8 engages with described shaft gear 9.

When the present invention uses, fastener 6 first slides, the stuck fastener 6 at position limited gear 7 between cog is unclamped, pull-out tape measure 12 arrives Len req, then the projection of fastener 6 is slided into the between cog of position limited gear 7, and position limited gear 7 is fixed, the link gear 8 being connected and fixed with position limited gear 7 is fixed thereupon, thereby shaft gear 9 is fixed, reel 10 lockings are motionless, thereby pin the length that tape measure 12 stretches out; Pen is fixed on the pen cap, adjusts pen height, by base 1 by magnet adsorption to blackboard, pen drives flexible rule box to rotate around base central shaft 4 under the constraint of tape measure 12, just can carry out picture sired results work; Picture unclamps fastener 6 after having justified, and under the convergent force of scroll spring 13, reel 10 drives tape measure 12 to shrink back in flexible rule box.The present invention is radii fixus effectively, simple to operate, draws circle convenient, and compasses build is light and handy, is easy to carry and takes care of.

The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims

1. gear compasses, is characterized in that, comprising: flexible rule box, the pen cap and base; Described flexible rule box is located on base, and tape measure is housed in flexible rule box; The described pen cap is connected with tape measure, and the pen cap under the constraint of tape measure around described base central rotation; Described flexible rule box comprises upper casing, lower casing, reel, scroll spring and lockable mechanism; Described lower casing is arranged on described base, and described upper casing and lower casing are connected and fixed; Described scroll spring is connected with described lower casing and reel respectively, and described tape measure is arranged on reel; Described lockable mechanism comprises shaft gear, link gear, position limited gear and fastener; Described shaft gear is fixed on described reel, and the mutual correspondence of described position limited gear and fastener is arranged on described upper casing; Described link gear and position limited gear are axially connected and fixed, and link gear engages with described shaft gear.

2. a kind of gear compasses according to claim 1, is characterized in that: described base is provided with central shaft; Described lower casing comprises lower house and the cylindrical sleeve that is fixed on lower house center, and described lower casing is enclosed within by cylindrical sleeve on the central shaft of described base; Described reel is enclosed within described cylindrical sleeve, and described scroll spring one end is fixed in cylindrical sleeve, and the other end is connected with described reel; Described tape measure is on described reel, and tape measure one end and reel are fixed, and tape measure can be by driving reel to shrink scroll spring; Described shaft gear is enclosed within described cylindrical sleeve, and shaft gear and described reel are fixed.

3. a kind of gear compasses according to claim 1, is characterized in that: described link gear is arranged on the below of described upper casing, and the connecting rod of link gear is through upper casing; Described position limited gear is arranged on upper casing top, and position limited gear is fixed on the connecting rod of described link gear; On described upper casing, on the position of corresponding described position limited gear, have chute, described fastener is arranged in chute; Described fastener is provided with projection, and fastener slides in chute and the projection of fastener can be against the between cog of described position limited gear.

4. a kind of gear compasses according to claim 2, is characterized in that: described base bottom is fixed with magnet, and the central shaft upper end of base has draw-in groove, is provided with check ring in draw-in groove; The central shaft of described base stretches out in described upper casing, and draw-in groove coordinates described flexible rule box is stuck on described central shaft with check ring.