CN217727256U

CN217727256U - Hand-tightening sleeve assembling structure of drill chuck

Info

Publication number: CN217727256U
Application number: CN202221636191.7U
Authority: CN
Inventors: 朱建平
Original assignee: Zhejiang Beilide Electromechanical Co ltd
Current assignee: Zhejiang Beilide Electromechanical Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-11-04
Anticipated expiration: 2032-06-27

Abstract

The utility model provides a hand-tightening sleeve assembling structure of a drill chuck, which belongs to the technical field of the hand-tightening drill chuck. It has solved the not enough technical problem of cooperation precision of current hand tight sleeve and brill body. The hand tightening sleeve assembling structure of the drill chuck comprises a drill body and a hand tightening sleeve sleeved on the drill body, wherein the inner edge of the hand tightening sleeve is provided with at least two positioning convex blocks which protrude along the radial direction and are arranged at intervals around the circumference of the hand tightening sleeve, one side of each positioning convex block, facing to the axial lead of the hand tightening sleeve, is in an inwards concave arc surface shape and is matched with the outer peripheral surface of the drill body, and a sprue groove for accommodating a sprue mold is formed between every two adjacent positioning convex blocks. The utility model discloses can avoid the runner burr of leaving over and bore and produce direct contact between the body and influence the location fit precision to boring the body.

Description

Hand-tightening sleeve assembling structure of drill chuck

Technical Field

The utility model belongs to the technical field of the tight drill chuck of hand, a tight suit assembly structure of hand of drill chuck is related to.

Background

A hand-held drill chuck generally comprises a drill body and a clamping jaw which is arranged in an inclined hole in the drill body and can move and guide along the axial direction of the inclined hole, wherein a hand-held nut is sleeved on the drill body and is in threaded connection with an external thread of the clamping jaw, the hand-held nut is circumferentially positioned with a peripheral hand-held sleeve, and the operation on the clamping jaw can be realized by rotating the hand-held sleeve.

The patent with the publication number of CN206763930U discloses a hand-tightened drill chuck, which comprises a drill body, a nut and a clamping jaw, wherein a supporting step is arranged in the middle of the drill body, a gasket is arranged on the supporting step, a second gasket is arranged on the drill chuck corresponding to the front part of the nut, and the front part of the nut is matched with the second gasket in a manner of preventing the nut from inclining.

The drill body in the hand fastening drill chuck is positioned through the inner edge of the hand fastening sleeve, but the sprue position of injection molding of the hand fastening sleeve is also arranged at the inner edge position for ensuring the appearance effect, and the burr of the sprue can influence the positioning of the drill body.

Disclosure of Invention

The utility model discloses to the above-mentioned problem that prior art exists, provide a tight suit assembly structure of hand of drill chuck, the utility model aims to solve the technical problem that: how to ensure the matching precision of the hand tight sleeve and the drill body

The purpose of the utility model can be realized by the following technical proposal:

the inner edge of the hand fastening sleeve is provided with at least two positioning convex blocks which protrude along the radial direction and are arranged around the circumference of the hand fastening sleeve at intervals, one side of each positioning convex block facing the axial line of the hand fastening sleeve is in an inwards concave arc surface shape and is matched with the outer peripheral surface of the drill body, and a sprue groove for containing a sprue mold is formed between every two adjacent positioning convex blocks.

Three or more clamping jaws which can be closed can be arranged in the drill bit body to clamp the drill bit, and a user can close and open the clamping jaws by rotating the hand tightening sleeve; set up radial protruding and circumference spaced location lug through the inner edge at the tight cover of hand, form the runner groove between adjacent location lug, and make the indent cambered surface on location lug surface and the adaptation of columnar brill body outer peripheral face, arrange the runner groove department between the location lug after the shaping because of the runner position when tight cover injection moulding of hand like this, avoid producing direct contact between the runner burr of leaving over and the brill body when guaranteeing the injection moulding effect and influence the location cooperation precision to the brill body, and then promote the assembly precision of boring body and the tight cover of hand.

In the hand fastening sleeve assembling structure of the drill chuck, the outer peripheral surface of the upper end of the drill body is fixedly sleeved with a limiting sleeve head, and the bottom of the limiting sleeve head is axially limited and abutted against the positioning bump. The limiting sleeve head and the upper surface of the positioning lug are abutted to form limiting, so that the drill body can be prevented from being separated from the lower end of the hand tightening sleeve, the positioning lugs are mutually separated to be beneficial to reducing the retraction amount of the injection molding cooling, the size precision of the positioning lug boss is ensured, and the limiting position of the drill body is also accurate and stable.

In the tightening sleeve assembling structure of the drill chuck, the positioning lugs are uniformly arranged at intervals around the circumference of the tightening sleeve. The size and the forming effect of each positioning lug are more uniform, and the circumferential positioning of the drill body is more uniform and reliable.

In the tightening sleeve assembling structure of the drill chuck, the periphery of the drill body is provided with an annular supporting and blocking shoulder, a tightening nut which is circumferentially positioned with the tightening sleeve is further sleeved on the periphery of the drill body, a gasket which is sleeved on the periphery of the drill body is arranged between the tightening nut and the supporting and blocking shoulder, and the gasket faces towards one side surface of the tightening nut and is provided with a convex edge part which is circumferentially arranged. Like this the hand tight nut rotate the time can with the gasket upper surface form mutual slip between the bead portion, bead portion does benefit to the friction area and the resistance that reduce the hand tight nut, the action is smooth and easy laborsaving during messenger's regulation, bead portion self relative dimension is littleer in addition, the hand tight nut can extrude the bead portion and produce bigger deformation when pressing from both sides tight drill bit, and then produce the thrust reversal axial thrust to the hand tight nut, make the screw thread of hand tight nut and cooperation screw thread compress tightly, avoid the drill bit to receive influences such as vibration and produce the pine and take off.

In the hand fastening sleeve assembling structure of the drill chuck, at least two convex edge parts are arranged at intervals along the circumferential direction of the gasket. Like this reserve space between the protruding arris portion does benefit to the production deformation of protruding arris portion deformation more, guarantees clamping stability.

In the tightening sleeve assembling structure of the drill chuck, the gasket is a plastic piece. The plastic part has larger deformation amount under the same pressure, which is beneficial to further improving the clamping stability.

In the tightening sleeve assembling structure of the drill chuck, the cross section of the convex edge part is semicircular, and the end surface of the convex edge part is subjected to circular arc transition treatment. Make protruding arris portion and hand tight nut form line contact like this, further reduce frictional resistance, and the top of protruding arris portion also produces deformation more easily simultaneously, promotes and uses convenience and reliability.

In the hand fastening sleeve assembling structure of the drill chuck, the inner edge surface of the gasket is in a horn shape with a small upper part and a big lower part. Therefore, the slope of the inner edge surface of the washer can adapt to the slope of the outer thread section of the clamping jaw which is arranged obliquely in the prior art, and the scraping damage to the washer is reduced when the inner edge of the blocking washer is in contact with the outer thread of the clamping jaw.

In the tightening sleeve assembling structure of the drill chuck, the drill body comprises a limiting section with a conical surface-shaped outer peripheral surface, the tightening nut and the gasket are sleeved on the periphery of the limiting section, and the maximum radial dimension of the limiting section is larger than the minimum dimension of the inner diameter of the tightening nut. The inner edge of the hand-tightening nut needs to be matched with the inclined clamping jaw external thread to form a flaring shape, so that the hand-tightening nut can be restrained by the range of the limiting section during assembly, and the phenomenon of deflection generated in the use process of the hand-tightening nut is reduced.

Compared with the prior art, the utility model has the advantages as follows:

this tight cover assembly structure of hand of drill chuck arranges the runner groove department between the locating convex block after the shaping because of the runner position when tight cover injection moulding of hand, avoids the runner burr of leaving over and produces direct contact and influence the location fit precision to boring the body when guaranteeing the injection moulding effect between the body, and then promotes the assembly precision of boring body and tight cover of hand.

Drawings

Fig. 1 is a schematic perspective view of the drill chuck for closefisted drill in this embodiment.

Fig. 2 is a schematic cross-sectional view of the drill chuck for closefisted drill in this embodiment.

Fig. 3 is a schematic perspective view of the glove of the present embodiment.

Fig. 4 is a schematic sectional view of the glove of this embodiment.

Fig. 5 is a schematic perspective view of the drill chuck of the present embodiment.

In the figure, 1, a drill body; 11. a support shoulder; 12. a limiting section;

2. tightening the hand sleeve; 21. positioning the bump; 22. a gate slot;

3. a limiting sleeve head; 4. tightening the nut by hand;

5. a gasket; 51. a convex edge part.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in figures 1-5, the drill chuck of the assembly structure of the hand fastening sleeve comprises a drill body 1 and the hand fastening sleeve 2 sleeved on the drill body 1, wherein the inner edge of the hand fastening sleeve 2 is provided with eight positioning convex blocks 21 which protrude along the radial direction and are arranged around the circumference of the hand fastening sleeve 2 at intervals, one side of each positioning convex block 21, which faces to the axial lead of the hand fastening sleeve 2, is in a concave arc surface shape and is matched with the outer circumferential surface of the drill body 1, and a sprue groove 22 for accommodating a sprue mold is formed between every two adjacent positioning convex blocks 21. Three clamping jaws which can be closed are arranged in the drill body 1 and used for clamping the drill bit, and a user can close and open the clamping jaws by rotating the hand tightening sleeve 2; through set up radial protruding and circumference spaced positioning convex block 21 at the inner edge of tight cover of hand 2, form runner groove 22 between adjacent positioning convex block 21, and make the indent cambered surface on positioning convex block 21 surface and cylindrical brill body 1 outer peripheral face adaptation, arrange runner groove 22 department between positioning convex block 21 after the shaping because of the runner position when tight cover of hand 2 injection moulding like this, avoid producing direct contact between the runner burr of leaving over and the brill body 1 and influence the location fit precision to the brill body 1 when guaranteeing the injection moulding effect, and then promote the assembly precision of boring body 1 and tight cover of hand 2. Furthermore, the outer peripheral surface of the upper end of the drill body 1 is sleeved and fixedly connected with a limiting sleeve head 3, and the bottom of the limiting sleeve head 3 is axially limited and abutted against the positioning bump 21. The spacing pullover 3 that the body 1 accessible upper end cover was established supports with location lug 21 upper surface and leans on and forms spacingly like this, and then avoids boring body 1 to deviate from tight 2 lower extremes of cover of hand, and location lug 21 separates the design each other and does benefit to the volume of returning after reducing self injection moulding cooling, and then guarantees the size precision of location boss, makes the also accurate stability of the limit position of boring body 1. The positioning projections 21 are arranged at regular intervals around the circumference of the hand grip 2. This is beneficial to ensuring that the size and the forming effect of each positioning lug 21 are more uniform, and further the circumferential positioning of the drill body 1 is more uniform and reliable.

As shown in fig. 1, 2 and 5, the periphery of the drill body 1 is provided with an annular support stop shoulder 11, the periphery of the drill body 1 is further sleeved with a hand tight nut 4 circumferentially positioned with the hand tight sleeve 2, a washer 5 sleeved on the periphery of the drill body 1 is arranged between the hand tight nut 4 and the support stop shoulder 11, and one side surface of the washer 5 facing the hand tight nut 4 is provided with a rib 51 circumferentially arranged. Like this the tight nut 4 when rotating can with the formation mutual slip between the bead portion 51 of packing ring 5 upper surface, bead portion 51 does benefit to and reduces the friction area and the resistance of tight nut 4, the action is smooth and easy laborsaving during messenger's regulation, bead portion 51 self relative dimension is littleer in addition, tight nut 4 can extrude the convex bead portion 51 and produce bigger deformation when pressing from both sides tight drill bit, and then produce the thrust reversal axial thrust reversal to tight nut 4, make the screw thread of tight nut 4 compress tightly with the cooperation screw thread, avoid the drill bit to receive influences such as vibration and produce the pine and take off. The projecting edge portions 51 are at least eight and are arranged at intervals in the circumferential direction of the gasket 5. Like this between the protruding arris portion 51 reserve space, do benefit to the production deformation of protruding arris portion 51 deformation more, guarantee clamping stability. The washer 5 is a wear resistant plastic piece. The plastic part has larger deformation amount under the same pressure, and the clamping stability is further improved. The cross section of the convex rib part 51 is semicircular, and the end surface of the convex rib part 51 is subjected to arc transition treatment. Make protruding arris portion 51 and hand tight nut 4 form line contact like this, further reduce frictional resistance, and the top of protruding arris portion 51 also produces deformation more easily simultaneously, promotes and uses convenience and reliability. The inner edge surface of the gasket 5 is in a horn shape with a small top and a large bottom. Therefore, the slope of the inner edge surface of the gasket 5 can be adapted to the slope of the outer thread section of the existing clamping jaw which is arranged obliquely, and the scraping damage to the gasket 5 is reduced when the inner edge of the baffle gasket 5 is contacted with the outer thread of the clamping jaw. The drill body 1 comprises a limiting section 12 with a conical surface-shaped outer peripheral surface, the limiting section 12 is sleeved with the hand nut 4 and the gasket 5, and the maximum radial size of the limiting section 12 is larger than the minimum size of the inner diameter of the hand nut 4. The inner edge of the hand-tightened nut 4 needs to be matched with the inclined clamping jaw external thread to form a flaring shape, so that the hand-tightened nut 4 can be restrained within the range of the limiting section 12 during assembly, and the phenomenon that the hand-tightened nut 4 deflects in the using process is reduced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a tight suit of hand assembly structure of drill chuck, drill chuck include drill body (1) and the tight cover of hand (2) of cover on drill body (1), its characterized in that, the inner edge of tight cover of hand (2) has at least two along radial protrusion and around tight cover of hand (2) circumference interval arrangement's location lug (21), location lug (21) be indent cambered surface form and all with the outer peripheral face adaptation of drill body (1) towards tight cover of hand (2) axial lead one side, form runner groove (22) that supply runner mould holding between adjacent location lug (21).

2. The hand-tightening sleeve assembling structure of the drill chuck as claimed in claim 1, wherein a limiting sleeve head (33) is sleeved and fixedly connected to the outer peripheral surface of the upper end of the drill body (1), and the bottom of the limiting sleeve head (33) is axially limited and abutted against the positioning bump (21).

3. The hand fastening sleeve assembly structure of a drill chuck as claimed in claim 1 or 2, characterized in that the positioning projections (21) are evenly spaced around the circumference of the hand fastening sleeve (2).

4. The tightening sleeve assembling structure of the drill chuck as claimed in claim 1 or 2, characterized in that the drill body (1) is provided with an annular supporting stop shoulder (11) at the periphery thereof, the drill body (1) is further sleeved with a tightening nut (4) circumferentially positioned with the tightening sleeve (2), a washer (5) sleeved on the periphery of the drill body (1) is arranged between the tightening nut (4) and the supporting stop shoulder (11), and a side surface of the washer (5) facing the tightening nut (4) is provided with a rib (51) circumferentially arranged.

5. The hand fastening sleeve assembly structure of a drill chuck as claimed in claim 4, characterized in that the raised edge portions (51) are at least two and are arranged at intervals along the circumference of the gasket (5).

6. The hand fastening sleeve assembly structure of a drill chuck as claimed in claim 4, characterized in that the cross section of the convex rib part (51) is semicircular, and the end surface of the convex rib part (51) is processed by circular arc transition.

7. The hand fastening sleeve assembly structure of a drill chuck as claimed in claim 4, characterized in that the washer (5) is a plastic piece.

8. The hand fastening sleeve assembly structure of a drill chuck as claimed in claim 4, characterized in that the inner edge surface of the washer (5) is in a shape of a horn with a small top and a big bottom.

9. The hand fastening sleeve assembly structure of the drill chuck as claimed in claim 4, characterized in that the drill body (1) comprises a limiting section (12) with a conical surface-shaped outer peripheral surface, the hand fastening nut (4) and the washer (5) are both sleeved on the periphery of the limiting section (12), and the maximum radial dimension of the limiting section (12) is larger than the minimum dimension of the inner diameter of the hand fastening nut (4).