CN202763830U

CN202763830U - Self-centering scribing tool

Info

Publication number: CN202763830U
Application number: CN 201220344540
Authority: CN
Inventors: 吴永旭; 姜娟; 张永泉; 彭学斌
Original assignee: Shanghai East Pump Group Co Ltd
Current assignee: Shanghai East Pump Group Co Ltd
Priority date: 2012-07-16
Filing date: 2012-07-16
Publication date: 2013-03-06
Anticipated expiration: 2022-07-16

Abstract

The utility model discloses a self-centering scribing tool which comprises a scribing device and a fixing device. At least three clamp pins which can stretch out of the fixing device or withdraw into the fixing device are evenly arranged on the fixing device. The scribing device is rotatably arranged on the fixing device. The fixing device further comprises a clamp body and a cone-shaped sliding block which is arranged inside the clamp body. A rotating plate is provided with a strip-type through hole. A marking pin can move along the strip-type through hole. The outer surface of the marking pin is in a threaded shape. The marking pin is fixed in the strip-type through hole through a fixing nut. The self-centering scribing tool has the advantages that the fixing device is placed in a round hole of a device to be processed, the clamp pins extend out and clamp the inner wall of the round hole so as to enable the center of the fixing device to be on the axis of the round hole, and then the marking pin on a connecting rod can be used for conveniently marking out an circular arc which is concentric with the rough hole. Consequently, the self-centering scribing tool eliminates troubles that a circular plate needs making according to the size of the round hole as a supporting point, saves manpower and material resources, and improves scribing efficiency and scribing accuracy.

Description

A kind of self-centering scoring tool

Technical field

The utility model relates to a kind of scoring tool, the especially a kind of self-centering scoring tool that can determine easily the center of circle of circular hole.

Background technology

Aborning, often can run into the hole of circle distribution on circular is bored, but before boring, will mark first circumference, will find first the center of annulus when drawing circumference.Because the centre is empty, at this moment scoring tool often can't be located.

People use circular plank or soft metal sheet to be embedded in the interior support as scoring tool of circular hole usually, find the center of circular hole at circular slab, then rule with scoring tool.Such method need to be produced the plectane that meets its diameter according to circular hole, and different circular holes need to be made the plectane of different-diameter, wastes time and energy, and line precision and line efficient are all very low, plectane sometimes also can occur and be stuck in the situation that can't take out in the circular hole.

The utility model content

The technical problems to be solved in the utility model provides a kind of self-centering scoring tool that can feel relieved to circular hole easily, by fixture is stretched into circular hole, block circular-hole internal-wall, make the self-centering scoring tool fixing in circular hole, draw the circular arc concentric with circular hole by the scriber that is located on the rolling disc again.Having overcome needs the field fabrication plectane as the deficiency of the support of scoring tool in the conventional art, thereby realizes the purpose of this utility model.

For achieving the above object, the technical solution of the utility model is as follows:

A kind of self-centering scoring tool, comprise a chalker and a fixture, chalker is comprised of rolling disc and the scriber that is fixed on the rolling disc, evenly be provided with at least three bayonet locks that can stretch out or regain in the fixture on the fixture, chalker is rotatable to be placed on the fixture.

Preferably, described fixture comprises that an inner hollow and cross section are the clamp body of U-shaped and are placed in clamp body conical slide block inner and that move up and down along the clamp body inwall, clamp body is provided with the pin hole identical with the bayonet lock number, one end of bayonet lock contacts with conical slide block by pin hole, the other end of bayonet lock is provided with spring eye, is provided with the screw thread spring in the spring eye.

Preferably, the middle part on described clamp body top is provided with internal thread hole, is mounted with the adjustment screw in the internal thread hole; Be provided with in the conical slide block one with internal thread hole bolt hole on an axis, be placed in set bolt in the bolt hole; Adjusting screw and set bolt connects as one.

Preferably, described rolling disc is provided with at least one strip through hole, and scriber can move along the strip through hole.

Preferably, the outer surface of described scriber is shape of threads, and it is fixed in the strip through hole by hold-down nut.

By technique scheme, the beneficial effects of the utility model are:

By putting fixture into circular hole, bayonet lock stretches out and blocks on the axis that is centered close to circular hole that circular-hole internal-wall makes fixture, can mark the circular arc concentric with circular hole with the scriber on the connecting rod easily, saved and to have made plectane as the trouble of the strong point according to the circular hole size, save manpower and materials, promoted line efficient and line precision.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is that self-centering scoring tool described in the utility model is in the specific implementation along the cutaway view of axis direction;

Fig. 2 is the in the specific implementation structure chart of rolling disc of self-centering scoring tool described in the utility model;

Fig. 3 be self-centering scoring tool described in the utility model in the specific implementation clamp body along the cutaway view of axis direction.

The specific embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

As shown in figures 1 and 3, self-centering scoring tool described in the utility model, comprise fixture and chalker, fixture comprises clamp body 200, bayonet lock 210, slide block 220, adjust screw 221, clamp body 200 is hollow cylinder, the bottom is open, closed upper part also has a screwed hole 202, clamp body 200 inside are provided with slide block 220, slide block 220 is a cone, one end of adjustment screw 221 is connected on the slide block 220 by the hold-down screw 222 of slide block 220 belows, and the other end of adjustment screw 221 stretches out by the screwed hole 202 on clamp body 200 tops, and slide block 220 can move up and down in clamp body 200 by adjusting screw 221;

Be provided with three around the clamp body 200 on same level and the equally distributed bayonet lock 210 that can stretch out or regain from clamp body 200 outer walls, bayonet lock 210 inside are provided with spring 223, screw 221 is adjusted in rotation, slide block 220 moves down, promote bayonet lock 210 and stretch out clamp body 200 outer walls, bayonet lock 210 withstands circular hole 300 inwalls, and whole fixture just is fixed in the circular hole, and the dead in line of the axis of fixture and circular hole 300.When slide block 220 moved up, bayonet lock 210 was regained in the clamp body 200 under the drive of screw thread spring 223;

As depicted in figs. 1 and 2, there is a cylindrical projections 201 clamp body 200 tops, rolling disc 230 is movably connected on the projection 201 by a round hole 232 and can freely rotates around projection 201, one end connection of rotating dish 230 of connecting rod 231, the other end is provided with strip through hole 233, be provided with scriber 110 in the strip through hole 233, scriber 110 usefulness carbide alloy are made, one end is pointed, outer surface has screw thread, be vertically set in the strip through hole 233 and also can move along strip through hole 233, scriber 110 can be fixing by nut 100;

During use, the self-centering scoring tool is put into circular hole 300, screw 221 is adjusted in rotation, and after circular hole 300 interior fixing, pivot link just can draw the circular arc with circular hole 300 concentrics with instrument.

Above demonstration and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. a self-centering scoring tool comprises a chalker, and described chalker is comprised of rolling disc and the scriber that is fixed on the rolling disc; It is characterized in that, described self-centering scoring tool also is provided with a fixture, evenly is provided with at least three bayonet locks that can stretch out or regain in the fixture on the described fixture, and described chalker is rotatable to be placed on the fixture.

2. a kind of self-centering scoring tool as claimed in claim 1, it is characterized in that, described fixture comprises that an inner hollow and cross section are the clamp body of U-shaped and are placed in clamp body conical slide block inner and that move up and down along the clamp body inwall, described clamp body is provided with the pin hole identical with the bayonet lock number, one end of described bayonet lock contacts with conical slide block by pin hole, the other end of described bayonet lock is provided with spring eye, is provided with the screw thread spring in the described spring eye.

3. a kind of self-centering scoring tool as claimed in claim 2 is characterized in that, the middle part on described clamp body top is provided with internal thread hole, is mounted with the adjustment screw in the described internal thread hole; Be provided with in the described conical slide block one with internal thread hole bolt hole on an axis, be placed in set bolt in the described bolt hole; Described adjustment screw and set bolt connect as one.

4. a kind of self-centering scoring tool as claimed in claim 1 is characterized in that, described rolling disc is provided with the strip through hole, and described scriber can move along described strip through hole.

5. a kind of self-centering scoring tool as claimed in claim 4 is characterized in that, the outer surface of described scriber is shape of threads, and it is fixed in the strip through hole by hold-down nut.