CN2192421Y

CN2192421Y - Auto-tighten drill clamping head

Info

Publication number: CN2192421Y
Application number: CN 94202196
Authority: CN
Inventors: 刘国政
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-01-21
Filing date: 1994-01-21
Publication date: 1995-03-22
Anticipated expiration: 2004-01-21

Abstract

The utility model discloses an auto-tighten drill clamping head which comprises an outer sleeve 1, a locking jaw 2, a push rod 3, a main body 4, a stopping tacking 5, a pressing ring 6, a steel ball 7, and a linkage bar 8. A linkage is formed by connecting the locking jaw 2 and the push rod 3 through the straight slot arranged on the back of the locking jaw 2, and three circular blind holes arranged evenly on the front of the push rod 3 which is spirally connected with the linkage bar 8; the locking jaw 2 and the main body 4 which are matched with the linkage have a centering action when the locking jaw 2 and the main body 4 are tightened; a drill is tightened and loosened only by screwing the outer sleeve 1 and the main body 4. The utility model has the advantages of simple structure, simple manufacturing process, and easy assembly.

Description

Auto-tighten drill clamping head

The utility model relates to the mechanical attachment field, particularly relates to a kind of self-tightening drill chuck.

The self-tightening drill chuck of present industrial use, be that acting in opposition with active force clamps drill bit, easy to use, but because it is radially spacing by the outer lug boss work of three tight pawls, the rear end face dovetail is connected interlock with push rod end face dovetail, complex structure, connecting portion required precision height, processing technology complexity, cost height, be difficult to form to produce in batches, do not replace traditional compact form drill chuck of removing.

It is a kind of simple in structure that the purpose of this utility model is to provide, and technology is easy, is easy to form the self-tightening drill chuck of batch process.

Shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, accompanying drawing 5, accompanying drawing 6, accompanying drawing 7, the utility model by overcoat 1, tight pawl 2, push rod 3, body 4, only mark closely 5, trim ring 6, steel ball 7 and gangbar 8 form.Tight pawl 2 is the garden cylinder with the one side that is close to overcoat 1 internal taper hole, two sides simultaneously are tapered plane, another side is straight plane, have a angle 60 ° little inclined-plane between the stress surface of straight plane and clamping drill bit, can improve centering precision and stressed, there is a straight trough at rear portion at tight pawl 2, is used to connect tight pawl 2 and push rod 3; Be evenly distributed with 3 garden shape blind holes on the anterior Cylinder of push rod 3; Its centreline space angle is 120 °, and the garden post spiral at rear portion is used for being connected with gangbar 8; Gangbar inner cone connection in 8 fens is connected two kinds of forms with outer cone.

Accompanying drawing 1 is overall structure figure of the present utility model;

Accompanying drawing 2 is the top view of self-tightening drill chuck;

Accompanying drawing 3 is the shape figure of tight pawl 2;

Accompanying drawing 4 is left views of tight pawl 2;

Accompanying drawing 5 is A-A profiles of tight pawl 2;

Accompanying drawing 6 is the shape figure of push rod 3;

Accompanying drawing 7 is B-B profiles of push rod 3.

Provide an embodiment of the present utility model below in conjunction with accompanying drawing.

Tight pawl 2 is connected by the straight trough at tight pawl 2 rear portions and the garden shape blind hole of push rod 3 front portions with push rod 3, forms the interlock of tight pawl 2 and push rod 3, and holds out against the groove inner face of tight pawl 2 by the end face of push rod 3, tight pawl 2 is moved axially, the clamping drill bit; Push rod 3 is connected with gangbar 8 by the garden post spiral at its rear portion.The garden cylinder of tight pawl 2 cooperates interlock near the internal taper hole of overcoat 1 with body 4, moves radially, and forms the centering effect when clamping.Clamp and need only turn overcoat 1 during loosening drill bit and body 4 get final product.

The utility model is simple in structure, and processing technology is easy, is easy to assembling, and cost is low, is well suited for production in enormous quantities.

Claims

1, a kind of self-tightening drill chuck, by overcoat (1), tight pawl (2), push rod (3), body (4), only mark closely (5), trim ring (6), steel ball (7) and gangbar (8) and form, it is characterized in that: there is a straight trough at the rear portion of tight pawl (2), its one side near overcoat (1) internal taper hole is the garden cylinder, two sides simultaneously are tapered plane, one side is straight plane, has a angle 60 ° little inclined-plane between the stress surface of straight plane and clamping drill bit; Be evenly distributed with three garden shape blind holes on the anterior Cylinder of push rod (3).Its centreline space angle is 120 °.

2, self-tightening drill chuck as claimed in claim 1, it is characterized in that: tight pawl (2) is connected with the anterior garden shape blind hole of push rod (3) with the straight trough of push rod (3) by tight pawl (2) rear portion, form interlock, and the groove inner face that the end face by push rod (3) holds out against tight pawl (2) moves axially tight pawl (2); Tight pawl (2) and body (4) cooperate interlock, move radially, and form the centering effect when clamping.