CN2637043Y

CN2637043Y - Now locking type hand fastening drill chuck

Info

Publication number: CN2637043Y
Application number: CN 03206927
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: 2003-07-31
Filing date: 2003-07-31
Publication date: 2004-09-01
Anticipated expiration: 2013-07-31

Abstract

The utility model discloses a new locking hand tightening drill bit which includes a front sleeve, a drill body, an internal sleeve, and a guide screw. The front sleeve is arranged at the front part of the drill body; the guide screw is arranged in a middle part of the drill body; a plurality of thin columns are fixed on the internal sleeve along the peripheral; one end of a plurality of elastic detents is fixedly connected with the thin column; the other end of the elastic detents forms a convex part; the internal sleeve is fixedly sleeved with an external peripheral of the guide screw; an internal wall of the front sleeve is provided with a plurality of concave troughs with the positions corresponding to the positions of the elastic detents; one side wall of the concave trough is contacted with one side wall of the thin wall; the other side wall of the concave trough is arranged at the convex part of the elastic detents, both of the other side wall and the convex part are contacted with each other; a group of ratch is uniformly arranged on the drill body along the peripheral. The position of the ratch is corresponding to the position of the elastic detent. The utility model can prevent the hand tightening drill bit producing looseness of the clamp claw when in work, and is particularly suitable for the work condition subject to frequent impact loads.

Description

Novel lock compact form hand fastening drill clutch

Technical field

The utility model relates to the drill chuck that a kind of machining equipment uses, and does not produce loosening hand fastening drill clutch during work that especially a kind of drilling machine uses.

Background technology

In the prior art, hand fastening drill clutch generally comprises drill body, jaw, screw, protheca and back cover.Patent Office of the People's Republic of China number is the utility model patent of CN2322725Y in the Granted publication of Granted publication on the 9th June in 1999, 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 friction torque that will overcome when relatively rotating between this hand fastening drill clutch screw and the drill body is: one, the rolling friction torque of the generation of the ball of thrust bearing between screw and drill body; Two, the sliding friction torque that the contact plane of small part produces between screw and the drill body; So the friction torque that will overcome when relatively rotating between screw and the drill body is relative less.

When this hand fastening drill clutch is subjected to shock loading or heavy load at work, relatively rotate easily between screw and the drill body, reduced shake-proof ability, make the drill slipping of jaw clamping or loosening, so that the normal production work of influence.

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 can not produce the loosening novel lock compact form hand fastening drill clutch of drill bit under load and vibrations condition of work.

The technical solution adopted in the utility model is: a kind of novel lock compact form hand fastening drill clutch, include protheca, drill body, screw and interior cover, this protheca is installed in the front portion of described drill body, this screw is installed in the middle part of described drill body, the plurality of thin post puts along circumferentially being fixed in this, one end of plurality of elastic ratchet is fixedlyed connected with this thin post, and the other end is formed with projection, and cover fixed cover is located on the described screw periphery wall in this; The inwall of described protheca has some grooves, and its position is corresponding with the position of described thin post and elastic pawl, and a sidewall of this groove contacts with a sidewall of described thin post, its another sidewall between the high spot of described elastic pawl and the two mutually against; Described drill body upper edge circumferentially has one group of ratchet uniformly, and the position of this ratchet is corresponding with the position of described elastic pawl.

The technical scheme that adopts the utility model to provide, on the drill body of drill chuck, have one group of evenly distributed ratchet, after drill bit is clamped by the utility model, the plurality of elastic ratchet of interior cover engages with ratchet, being difficult for rotating between screw and the drill body is that jaw does not produce displacement with respect to drill body, and drill bit can not get loose.Security reliability when the utility model has improved drill chuck work greatly.

Description of drawings

Fig. 1 is the structural representation of first kind of embodiment of the utility model novel lock compact form hand fastening drill clutch;

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

Fig. 3 is the perspective view of the interior cover of novel lock compact form hand fastening drill clutch among Fig. 1;

Structural representation when Fig. 4 is in locking state for the novel lock compact form hand fastening drill clutch among Fig. 2;

Fig. 5 is the structural representation of second kind of embodiment of the utility model novel lock compact form hand fastening drill clutch;

Fig. 6 is the perspective view of the interior cover of novel lock compact form hand fastening drill clutch among Fig. 5.

The specific embodiment

First kind of embodiment of the present utility model, referring to Fig. 1, Fig. 2, novel lock compact form hand fastening drill clutch comprises a drill body 1, along the inclined hole that circumferentially offers 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 equipped with a screw 3, and this screw 3 and each jaw 4 interconnect by screw thread.Protheca 2 is equipped with in the preceding Ruian of drill body 1, and the rear end is equipped with back cover 8, and the binding site place of protheca 2 and back cover 8 is provided with projection and circular groove structure respectively, and this structure links together the two.One thrust bearing 6 and the packing ring 7 that is arranged at this thrust bearing rear end are installed, to guarantee being free to rotation between screw 3 and the drill body 1 between screw 3 upper surfaces and the drill body 1 middle bench face.Cover 5 in the periphery of screw 3 is with, as shown in Figure 3, the edge of interior cover 5 is circumferentially with Bao Zhu 51, and an end of elastic pawl 52 is fixedlyed connected with thin post 51, and the other end is formed with projection, adopts interference fit between interior cover 5 and the screw 3.Protheca 2 inwalls have groove 21, its position is corresponding with the position of thin post 51 and elastic pawl 52, one sidewall of groove 21 contacts with a sidewall of thin post 51, another sidewall of groove 21 between the high spot of elastic pawl 52 and the two mutually against, in order to improve the force-bearing situation between groove 21 and the elastic pawl 52, the upper semisection of this distolateral wall of groove 21 can be processed into arc surface.The periphery wall of drill body 1 is provided with along circumferential one group of evenly distributed ratchet 11, and its position is corresponding with the position of elastic pawl 52.

Wherein, the mode of fixedlying connected with thin post 51 of elastic pawl 52 can be riveted joint or welding.The material of elastic pawl 52 can be a spring steel; The material of thin post 51 can be common straightcarbon steel, for example A ₃Steel etc.

The course of work of the present utility model is as follows:

At first, novel lock compact form hand fastening drill clutch is fastened on the drill press spindle, with the opening of 4 of three jaws of drill bit insertion, according to the rotation direction rotation protheca 2 of screw thread by the screwed hole of drill body 1 upper end.At this moment, the projection of the sidewall of groove 21 and elastic pawl 52 mutually against, when the resistance to deformation moment of elastic pawl 52 generations is not less than the torsional moment that acts on the protheca 2, cover 5 rotations in protheca 2 drives, because between interior cover 5 and the screw 3 is interference fit,, three jaws 4 are moved downward simultaneously so screw 3 together rotates with interior cover 5, the opening that three jaws are 4 dwindles, and drill bit is clamped gradually.Along with drill bit is clamped gradually, the torsional moment of rotating protheca 2 will strengthen gradually, when its resistance to deformation moment that produces greater than elastic pawl 52, elastic pawl 52 produces strain, and its projection is carried away outside the groove 21, and the end of elastic pawl 52 and the ratchet 11 of drill body 1 are fastened, protheca 2 continues rotation, at this moment, owing to make engaging of elastic pawl 52 and ratchet 11, interior cover 5 is no longer along with protheca 2 together rotates.After protheca 2 rotates a certain angle with respect to interior cover 5, the other end sidewall of its groove 21 touches the sidewall of Bao Zhu 51 opposite faces, under of the effect of groove 21 these distolateral walls to thin post 51 ejection forces, elastic pawl 52 ends produce distortion and engage with ratchet 11 disengagings, interior cover 5 and screw 3 are along with protheca 2 continues with respect to drill body 1 rotation, up to jaw 4 drill bit is clamped fully, be in state as shown in Figure 4, under the snap action of elastic pawl 52 and ratchet 11 with screw 3 and drill body 1 between locking, can begin drilling.

Second kind of embodiment of the present utility model as Fig. 5, shown in Figure 6, circumferentially is provided with three thin posts 51 uniformly at interior cover 5 lower end edges, and each thin post 51 is fixedly connected with elastic pawl 52, corresponding, circumferentially have three grooves 21 uniformly on protheca 2 inwalls edge.Adopt the technical scheme of present embodiment, make the utility model stressed even when work, locking effect is better.

Claims

1, a kind of novel lock compact form hand fastening drill clutch, include protheca, drill body and screw, this protheca is installed in the front portion of described drill body, this screw is installed in the middle part of described drill body, it is characterized in that: this drill chuck also includes interior cover, and the plurality of thin post puts along circumferentially being fixed in this, and an end of plurality of elastic ratchet is fixedlyed connected with this thin post, the other end is formed with projection, and cover fixed cover is located on the described screw periphery wall in this; The inwall of described protheca has some grooves, and its position is corresponding with the position of described thin post and elastic pawl, and a sidewall of this groove contacts with a sidewall of described thin post, its another sidewall between the high spot of described elastic pawl and the two mutually against; Described drill body upper edge circumferentially has one group of ratchet uniformly, and the position of this ratchet is corresponding with the position of described elastic pawl.

2, novel lock compact form hand fastening drill clutch as claimed in claim 1 is characterized in that: at least two described thin posts distribute along the circumferentially even of described annular solid, and each described thin post is fixed with a described elastic pawl.

3, novel lock compact form hand fastening drill clutch as claimed in claim 1 is characterized in that: the sidewall upper semisection of described groove that is positioned at the high spot of described elastic pawl is an arc surface, the projection of this arc surface and this elastic pawl mutually against.