CN2609692Y

CN2609692Y - Closefisted drill chuck

Info

Publication number: CN2609692Y
Application number: CN 03250402
Authority: CN
Inventors: 周文华
Original assignee: SAN-OU DRILL HOLDER MANUFACTURING Co Ltd TAIZHOU CITY
Current assignee: Zhejiang Sanou Machinery Co Ltd
Priority date: 2003-04-23
Filing date: 2003-04-23
Publication date: 2004-04-07
Anticipated expiration: 2013-04-23

Abstract

The utility model discloses a handtight drill chuck, comprising a front sleeve and a rear sleeve. The outer surface of the front sleeve is axially opened with a plurality of dovetail grooves, and the lower ends of the dovetail grooves are opened with ring-shaped grooves which communicate the dovetail grooves. An outer sleeve comprises ring-shaped ribs, a plurality of branches with amount equal to that of the dovetail grooves are arranged on circumference of the ring-shaped ribs which are arranged in the ring-shaped grooves, the branches are arranged in the dovetail grooves, and section thickness of the branches is larger than depth of the dovetail grooves. Additionally, the rear end of the front sleeve is provided with ring-shaped protuberances, and the rear sleeve corresponding to the ring-shaped protuberances is opened with ring-shaped grooves which is block-connected with the ring-shaped protuberances. The handtight drill chuck of the utility model provides enough holding friction force, and enhances utilization safety, with comfortable hand feeling. Assembly of the front sleeve and the rear sleeve is more convenient, and the front and rear sleeves are more stable, without generating radial jumping during working of the drill chuck.

Description

Hand fastening drill clutch

Technical field

The utility model relates to a kind of drill holder that machining equipment uses that is installed in, the especially hand fastening drill clutch of step and a kind of drilling machine use.

Background technology

In the prior art, hand fastening drill clutch generally comprises drill body, jaw, screw, protheca and back cover.On June 9th, 1999 Granted publication Chinese utility model patent CN2322725, a kind of hand fastening drill clutch is disclosed, this drill chuck comprises drill body, jaw, screw, protheca and back cover, three jaws are separately positioned in three inclined holes that are distributed on the drill body, adopt thread connection between screw and the jaw, the screw rear end is provided with thrust bearing, the rear end of thrust bearing is provided with back-up ring, the rear end of drill body is equipped with the back cover, screw is a two halves formula structure, by a nut sleeve two halves are integrated, interference fit between nut sleeve and the screw adopts key connecting to transmit moment of torsion between protheca and the nut sleeve, the inner surface of protheca front end is formed with annular protrusion, corresponding position that should projection on the drill body is provided with annular groove, by the cooperate axial location that realize protheca of above-mentioned projection with groove.Loading and unloading are rotated protheca with hand and are driven screw during drill bit, three jaws are moved up and down clamp or unclamp drill bit, are processed with groove or fin in order to strengthen frictional force at the protheca outer surface.

The shortcoming of this hand fastening drill clutch is: one, when rotating protheca, because fin is directly to process, can stay wedge angle or burr on protheca, scratch work protector such as gloves easily when firmly rotating; Two, not only the installation of protheca is comparatively inconvenient, and owing to do not have fit structure between protheca and the back cover, thereby make that protheca all can produce bigger circular runout with the back cover when drill chuck was worked.

The utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of and is convenient to hold firmly when rotating protheca and hand fastening drill clutch safe in utilization.

Another purpose of the present utility model provides a kind of hand fastening drill clutch, and the installation of protheca and back cover is all comparatively convenient, and protheca and back cover not be all comparatively firmly, can produce circular runout during drill chuck work.

The technical solution adopted in the utility model is: a kind of hand fastening drill clutch, comprise protheca and back cover, and the outer surface of this protheca has some dovetail grooves vertically, and the lower end of this dovetail groove has annular groove, and this annular groove connects described some dovetail grooves; One overcoat comprises annular muscle, the some branches that equate with the quantity of described dovetail groove that are circumferentially with along this annular muscle, described annular muscle is installed in the described annular groove, and described branch is installed in the described dovetail groove, and the section thickness of this branch is greater than the degree of depth of described dovetail groove.

For realizing that the technical scheme that another purpose of the present utility model further adopts is: the protheca rear end of described hand fastening drill clutch is provided with annular protrusion, the position corresponding with this annular protrusion, put after described and have annular groove, this annular groove and this annular protrusion engagement connection.

The hand fastening drill clutch that provides according to the utility model has following advantage with respect to prior art:

1, nonmetal overcoat is embedded on the protheca, when enough assurance frictional force is provided, has improved usage safety performance, and comfortable feel.

2, make the two be connected the axial location that cooperation realizes protheca by the annular protrusion that preceding is arranged with the annular groove that the back cover has, make that not only the installation of protheca and back cover is all comparatively convenient, and protheca and back cover not be all comparatively firmly, can produce circular runout during drill chuck work.

Description of drawings

Fig. 1 is the structural representation of the utility model hand fastening drill clutch;

Fig. 2 is along the cutaway view of A-A among Fig. 1;

Fig. 3 A, Fig. 3 B are the structural representation of the overcoat of the utility model hand fastening drill clutch.

The specific embodiment

The utility model hand fastening drill clutch referring to Fig. 1, Fig. 2, comprises a drill body 1, along the inclined hole that circumferentially is provided with three inclinations equally spacedly, a jaw 4 is installed slidably in each inclined hole in this drill body 1.The middle part of drill body 1 is provided with a screw 3, and this screw 3 and each jaw 4 interconnect by screw thread, and screw 3 is a two halves formula structure, and its outer surface is with a nut sleeve 5, interference fit between this nut sleeve 5 and the screw 3.Drill body 1 is provided with a protheca 2, and the rear end is equipped with a back cover 7, is interference fit between back cover 7 and the drill body 1.The outer surface of this protheca 2 has some dovetail grooves 24 vertically, has annular groove 81 in the lower end of dovetail groove 24, and this annular groove 81 connects above-mentioned some dovetail grooves 24, adopts key connecting to transmit moment of torsion between protheca 2 and the nut sleeve 5.Overcoat 8 is by having certain flexible nonmetallic materials, for example plastics etc. process, referring to Fig. 3 A, Fig. 3 B, it comprises annular muscle 85, the branch 84 that equates with the quantity of dovetail groove 24 that is circumferentially with along annular muscle 85, annular muscle 85 is installed in the annular groove 81, and branch 84 is installed in the dovetail groove 24, and the thickness of branch 84 is greater than the degree of depth of dovetail groove 24.

When rotating protheca 2, in order to make the frictional force that produces between hand and the protheca 2 even, can make dovetail groove 24 along circumferentially evenly the offering of protheca 2, corresponding, make the also evenly setting of branch 84 of overcoat 8.The thickness of branch 84 is greater than the degree of depth of dovetail groove 24, the hand comfort of the operator when using the utility model in order further to improve, and circular arc is processed in the cross section that branch 84 can be exceeded dovetail groove 24 positions.

In addition, can all have outlet structure 23 in the upper end of some dovetail grooves 24, this outlet structure 23 is a semi-closed structure, and as shown in Figure 1, the upper end of branch 84 is inserted in this outlet structure 23, make between branch 84 and the dovetail groove 24 combine tightr.

In order to reach another purpose of the present utility model, can be provided with annular protrusion 21 in protheca 2 rear ends of described hand fastening drill clutch, with these annular protrusion 21 corresponding positions, on back cover 7, have annular groove 71, this annular groove 71 engages with annular protrusion 21, and protheca 2 and back cover 7 are linked together.

The course of work of the utility model hand fastening drill clutch is as follows:

At first by the screwed hole of drill body 1 upper end, hand fastening drill clutch of the present utility model is fastened on the drill press spindle, with holds protheca 2, rotation direction according to screw 3 screw threads is rotated protheca 2, drive nut sleeve 5 and screw 3 rotations, three jaws 4 are moved upward simultaneously, thereby the opening of 2 of three jaws is increased, then drill bit is inserted wherein.Firmly rotate protheca 2 more round about, drive screw 3 and rotate, three jaws 4 are moved downward and drill bit is clamped, can begin drilling.

Claims

1, a kind of hand fastening drill clutch, include protheca and back cover, it is characterized in that: the outer surface of described protheca (2) has some dovetail grooves (24) vertically, and the lower end of this dovetail groove (24) has annular groove (81), and this annular groove (81) connects described some dovetail grooves (24); One overcoat (8), this overcoat (8) is provided with the annular muscle (85) that matches with the annular groove (81) of protheca (2), along some branches (84) that being circumferentially with of this annular muscle (85) matched with described dovetail groove (24), overcoat (8) by described annular muscle (85) and described annular groove (81) combine and the combined cover of described branch (84) and described dovetail groove (24) is contained on the protheca (2), and the section thickness of described branch (84) is greater than the degree of depth of described dovetail groove (24).

2, hand fastening drill clutch according to claim 1 is characterized in that: described some dovetail grooves (24) are circumferentially evenly offered along described protheca (2), and corresponding, and some branches (84) of described overcoat (8) evenly are provided with.

3, hand fastening drill clutch according to claim 1 is characterized in that: the upper end of described some dovetail grooves (24) all has outlet structure (23), and the upper end of described branch (84) is inserted in this outlet structure (23).

4, according to claim 1,2 or 3 described hand fastening drill clutch, it is characterized in that: the cross sectional shape that described branch (84) exceeds described dovetail groove (24) position is a circular arc.

5, hand fastening drill clutch according to claim 1, it is characterized in that: the rear end of described protheca (2) is provided with annular protrusion (21), with the corresponding position of this annular protrusion (21), on described back cover (7), have groove (71), this groove (71) and this annular protrusion (21) engagement connection.