AU2023340836B2

AU2023340836B2 - A single unit tool holder device for easy clamping and de-clamping of a tool shank

Info

Publication number: AU2023340836B2
Application number: AU2023340836A
Authority: AU
Inventors: Abdul Shakur QURESHI; Asab QURESHI; Jaheda QURESHI; Tabbassum QURESHI; Yunus QURESHI; Zaveria QURESHI
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-09-17
Filing date: 2023-09-13
Publication date: 2026-03-12
Anticipated expiration: 2043-09-13
Also published as: AU2023340836A1; WO2024057337A1

Abstract

The single unit tool holder device/ 100) having the upper part of the body consists of a rotational drawbar with bevel gear(7) at the bottom end. The lower part of the body consists of a chuck body(2) with rotating bevel gear/7) and bevel gear pinion(3) assembly. The taper collet(13) is inserted into the collet insertion hole(17), and the female screw hole(19) at the end of the taper collet(13) is loosely screwed into the male screw' portion(20) at the tip of the draw' screw(29). The shank portion! 14) of the tool is inserted into the tool holding hole(15) in a state where the draw screw(29) is loosened in advance by the bevel gear pinion(3). This device! 100) forms in a single unit. Therefore, an useful adapter length is utilized in deep machining without any foul. Hence, there is no chance of torque leakage for easy clamping and de-clamping of a tool shank.

Description

TITLE OF THE INVENTION: A SINGLE UNIT TOOL HOLDER DEVICE FOR EASY CLAMPING AND DE-CLAMPING OF A TOOL SHANK FIELD OF INVENTION

This invention is related to the clamping device. More particularly, the present

invention relates to a small-diameter tool holding chuck for holding a small-diameter

rotary tool used in precision machine tools and the like. More specifically, it is an

improvement in small-diameter tool holding chuck to overcome the various machining

problem and thereby reducing manufacturing costs.

BACKGROUND OF INVENTION In the production or maintenance industry, there is a continuous improvement in tool

holding chuck systems which substantially increases the grip strength or slip torque of

the tool holding chuck system without significantly increasing manufacturing costs or

equipment complexity.

There are a number of manufacturing or production plants wherein various types of

tool bits are used which can be easily inserted and removed from the chuck by

operating a sleeve member or other actuating device without the need for a wrench or

other tool. This type of chucking device is called a "quick-conversion" chuck which is

used in mass production. In these special types of chucks, the tool shank is inserted

into the holes formed by the segments of the chuck body. The segments are separated

by axial slits. The compressive force is exerted on the segment to compress or flex the

segment radially inward to grip the handle of the tool.

The importance of increasing grip strength or slip torque is particularly relevant to the

use of high-speed machinery such as routers, empty cutters, laminating trimmers and

the like which are high-precision types of machinery. The disclosed invention is

particularly relevant to those chucks that substantially increase the grip strength and

slip torque of the chucks without adding manufacturing steps or expense.

Various types of machining tool holders are used according to the need of

operations. Therefore, a huge variety of sizes and shapes are present in machining tool

holders. Generally, due to the availability at low cost, ease of operation and easy

maintenance the back draw tool holders are more popular. The back draw tool holders

are having a structure in which a drawing screw is able to rotate which is attached to a

tool holder's main body, and this drawing screw draws a collet deep into a collet

holding hole. These tool holders include a tapered collet for inserting a shank portion

of a tool therein and a drawing screw that is screwed in the tapered collet. A wrench is

inserted from a rear end opening of a pull stud attachment hole, and the drawing screw

is turned in a tightening direction to draw the tapered collet deep into a collet holding

hole, thereby chucking the tool inserted in a tool insertion hole of the collet. The back

draw tool is having its own disadvantage of removing pull studs every time while doing

clamping / de-clamping of the cutting tool by inserting the Allen key in the drawbar.

For different operations, different types of tools are required. Therefore while

changing tools the back draw tool holders are required to be removed or inserted from

the machining centre every time and due to the paucity of time in the production line,

this becomes a cumbersome task for the user. Hence there is a need for improvement

in existing tool holders.

Additionally, the major problem associated with the existing tool holder is described

as follows. If the tool length of the tool holder, which is a distance from the top end

of the shank portion formed along the outer periphery of the rear end of the tool holder

to the top end of the tool holder, is longer than that of typical tool holders, the use of a

short drawing screw requires a deep hole drilling process to form a hole from the rear

end of the shank portion, which increases the processing time and the processing cost.

If the same drilling process for the drawing screw is used as that used in tool holders

having a short tool length, the length of the drawing screw is increased, thereby

reducing the rigidity of the drawing screw. Thus, the tapered collet can be drawn

obliquely.

In the production line there is a continuous workflow and to maintain a suitable rate

of production with accuracy and precision user needs to be much concerned about the

fixtures of every part of tooling and clamping accessories. It becomes a tedious job to

-2- align two different parts together to maintain the required run-out accuracies and therefore it adversely affects the manufacturing cost. Furthermore, there is a high chance of torque leakage due to power transmission through two different parts which also hampers the quality of work and fineness of the workpiece. In the existing clamping device, the servicing of the bevel gear operating tool holder is having a big problem as it needs to send back to the original manufacturer to maintain the required accuracies of two parts and align them back to their original position. It is quite a lengthy process because spare parts may not be easily available in the market. Further hub ring formation during the assembly creates chances of fouling and in turn, reduces the useful length of the tool holder

The prior art reveals that there have been attempts to develop a device and apparatus

for clamping and de-clamping a tool shank which is used in different types of

machining centres.

Following patent literature describes the existing state of the art:

I. JP5762301B2: Tool Holder

JP5762301B2 describes a tool holder which includes a hollow taper shank chucking

device having a centre axis, a chucking device, a tension rod which cooperates with

the chucking device and an actuating unit by means of which the tension rod may be

actuated, i.e., displaced. The actuating unit has an actuating element which is movable

at an angle relative to the centre axis and which includes at least one actuating part.

The angle may be 90°. The tension rod is provided with at least one engagement part.

The actuating part and engagement part form a wedge mechanism which is used to

convert a radial motion of the actuating element, i.e., a displacement perpendicular to

the centre axis, into an axial displacement of the tension rod in the direction of the

25 centre axis.

This tool holder device of JP5762301B2 is two piece unit therefore there are chances

of torque leakage while clamping and de-clamping of a tool shank. Further this

chucking device cannot be used to hold a cylindrical shank tool like end-mill, drill,

reamer and the like. All parts mentioned in JP5762301B2 are the parts which are

generally used in a hollow taper shank chucking device only.

JP5762301B2 provides a tool holder whose overall length measured in the direction

of the centre axis is relatively short, SO that even under space constraints the tool holder

is able to hold tools which are then used to machine work pieces. Moreover a variety

of components required to assemble and align it together precisely SO as to achieve the

desired accuracy. Therefore, its manufacturing cost becomes relatively high.

II. JP5762301B2: Tool Holder

In this invention the slotted hole communicating with an inside of a recessed groove

is formed on a side surface of a draw bar. In the neighbourhood of a taper shank portion

of a holder body, a slant through hole communicating with the inside of the recessed

groove via the slotted hole is formed from a front end side toward a rear end side of

the holder body. A draw member is rotatable screwed into a threaded portion formed

on the recessed groove of the draw bar. A connecting engagement part is formed at a

central portion of a tip of the draw member. In this invention an engaging means of an

operating means inserted from the slant through hole through the slotted hole is

engaged and connected with the connecting engagement part.

This invention relates to a tool holder used in, for example, a machining centre

or the like, and more particularly to a tool holder suitable for deep digging in die

machining or the like, or high speed rotation machining in light alloy or the like.

In JP5762301B2, a rotatable retractable member is provided. A coupling

engaging portion is provided at the centre of the distal end of the retractable member

and it is located near the tapered shank portion of the holder body from the front-end

side to the rear end side of the holder main body. In this invention when the rotary

operation handle is rotated to rotate the retracting member, the drawbar does not rotate,

but only the retracting member rotates and the drawbar reciprocate linearly along the

central axis line to move the collet forward and backward along the taper surface of

the tip side of the through hole. However, there is no clarity about how the retracting

member only rotates and does not move along the central axis without any friction free

back support. This is a major drawback of invention disclosed in JP5762301B2.

Furthermore, the configuration of the holder is complicated as the number of parts

used are large in number, thereby increasing the production cost / manufacturing cost

to a great extent.

-4-

III. KR100947414B1- Tool, tool holder, and machine tool

In this invention the tool is attachable to a spindle of a machine tool by an automatic

tool changer in the same way as an ordinary tool. It is driven without connecting with

an external power supply and able to rotate at a rotational speed different from that of

the spindle of the machine tool without supply of electric power from the outside. The

disclosed device is provided with a machining tool for machining a work-piece and

motor is connected with the machining tool for rotating the machining tool with a

generator from which rotary force is transmitted from the spindle of the machine tool

which generates electric power to drive the motor. The shaft of the motor is arranged

in an orientation different from the axial centre of the spindle.

The objective of this invention is to provide a tool and a tool holder capable of rotating

a waterway tool, which is attached to the machine tool body. This invention is not

suitable for a small-diameter tool holding chuck for holding a small-diameter rotary

tool as disclosed in proposed invention.

There is an additional electric motor is connected to the tool SO as to rotate the tool at

higher rotational speed. Further the taper shank (mounting part) of the tool holder is

mounted on a spindle which transfers rotational force of the spindle to the electric

generator which is assembled inside the casing member. This arrangement increases

the complexity of the invention.

KR100947414B1 describes only about cutting tool rotation with the help of an electric

motor rotationally driven by electric power supplied from the generator via cable

which is completely different from the proposed invention.

IV. KR100947414B1 Machine Tool

In this invention the clamping of a small-diameter tool is performed by using stable

energizing force of a Belleville spring. In unclamping of the small-diameter tool, when

coolant (normally, gas such as compressed air) to serve as an operating medium is fed

from a coolant supplying source, it enters a cylinder chamber part on the back pressure

side of a piston member from an introducing pipe part through a draw bar and a

diameter extending part, SO as to advance the piston member while competing with the

Belleville spring. Therefore, a part whose diameter is contracted of a spring collet is elastically returned to the original diameter, and clamping of the small-diameter tool is released.

Here, the mounting portion as of a hallow tapered shank portion specifically of HSK

taper interface. In this invention there is nothing explained about using this invention

in tapered sleeve shank spindles of BT / SK / CAT interfaces which are having a

clamping mechanism built in the spindle to clamp the pull stud at the mounting portion

of the tool holder when the mounting portion is mounted to the tapered sleeve of the

spindle. Further, this invention is not describing about any mechanism of clamping or

de-clamping of a tool in a collet type tool holder. In addition to that there is nowhere

mentioned in the description about use of bevel gear.

Moreover, in this invention tool clamping and unclamping cannot be done manually

outside the machine. Therefore, this disclosed tool holder cannot be used for general

purpose of holding the tool for inspection on tool inspection machine.

In the construction of this disclosed tool holder there is a need of a combination of

stationary parts and reciprocating parts. Due to this, SO many components are required

to assembled and aligned together precisely SO as to achieve the desired accuracy.

Therefore, the manufacturing cost becomes relatively high.

On the contrary the proposed invention being in a single form, manufacturing

processes can be completed in one setting without disturbing centre line of the holder.

Therefore, manufacturing cost is comparatively less. Furthermore, since the

configuration of the holder can be simplified to reduce the number of parts, the

production cost of the proposed invention is also reduced.

For the reasons stated above, which will become apparent to those skilled in the art

upon reading and understanding the specification, there is a need in the art for a device

for clamping and de-clamping a tool in a shank. The present invention has been made

in consideration of the above-described problems of the prior art, and it is an object of

the present invention to provide an improved version of the bevel gear operating

adapter in two parts. The upper part of this holder body consists of a rotational drawbar

with a bevel gear at the bottom end. The lower part of the holder body consists of a

chuck body with a rotating pinion assembly. The adapter is securely connected and fixed to the chuck body. Specifically, the end portion of the adapter fits in the circular recess of the chuck body. Furthermore, the flat annular end face of the adapter is in surface contact with the flat annular tip face of the chuck body. The annular end face and the end face are perpendicular to the common centre axis. The inner peripheral surface of the circular recess has a constant diameter in the axial direction and is formed coaxially with the common axis. The inner circumferential surface is cantered

SO that the axial centre of the adapter coincides with the axial centre of the chuck body.

Henceforth, for solving the abovementioned problems, for clamping and de-clamping

the tool holder provided with an improved version of the bevel gear operating adapter

is in single form is provided.

OBJECT OF THE INVENTION

The object of the present invention is to provide a small-diameter tool holding chuck

for holding a small-diameter rotary tool used in precision machine tools.

Another object of the invention is to provide a small-diameter tool holding chuck for

holding a small-diameter rotary tool used in precision machine tools that have high

strength, less manufacturing cost as well as trouble-free maintenance.

Yet another object of the invention is to provide a small-diameter tool holding chuck

for holding a small-diameter rotary tool which can be produced in a single unit with

an improved version of the bevel gear operating adapter which is presently available

in two parts

for holding a small-diameter rotary tool provided with a particular gear ratio for

hassle-free operation

for holding a small-diameter rotary tool used in precision machine tools that can

operate in an efficient manner to transmit the torque.

for holding a small-diameter rotary tool used in precision machine tools which is more

reliable than any other tool holding device.

for holding a small-diameter rotary tool used in precision machine tool which is using

fewer complex components and provide an effective and easy solution to existing tool

systems.

SUMMARY OF THE INVENTION

Embodiments of the present disclosure present technological improvements as

solution to one or more of the above-mentioned technical problems recognized by the

inventor in conventional practices and existing state of the art.

The present invention relates to a small-diameter tool holding chuck for holding a

small-diameter rotary tool used in precision machine tools and the like.

The present invention provides a single unit tool holder device for easy clamping and

de-clamping, comprising a chuck body that has a shank portion provided at one end

and a collet insertion conical hole having an enlarged shape at the tip. A tapered collet

having a female screw hole at the bottom end to be inserted into the collet insertion

conical hole and screwing with a draw screw having a male screw extending from the

bevel gear to the tip side and inserted into the collet insertion conical hole from the

bottom end of the adapter. In this device, a pinion is rotatably and accommodated in

the extending lateral hole, engages with the bevel gear and rotates the draw screw to

move the taper collet coaxially inside or outside. The present disclosure provides a tool

holder device for easy clamping and de-clamping wherein an improved version of

bevel gear is provided for the operating adapter which is in a single form rather than

dividing a holder body in parts and roundness of collet insertion conical is in relation

to the centre line of the holder SO that it can move in vertical direction in which the

centre of the holder remains unchanged even if components are replaced as per

necessity of other components. The disclosed tool holder has an improved design due

to which this holder can be manufactured in a single unit. It also has modified bevel

gear and pinion ratio to 1:1 (Miter gear). Due to this modified gear ratio, the small bevel gear can be easily inserted into the collet cavity and put in the place. Therefore, without affecting the functionality it can perform all operations in an efficient manner and with precision without fail.

The disclosed device provides a tool holder which is manufactured as a single

unit. Hence it eliminates the formation of extended circumferential flange ring.

Therefore, useful adapter length can be fully utilized in deep machining without any

foul. Moreover, there is no chance of torque leakage. Therefore, it is more

advantageous other tool holders.

Also, a damaged holder can be repaired and refurbished anywhere with OEM spare

parts. Even if the component is replaced, the vertical degree is prevented in advance,

SO that the precision of the holder body can be constantly maintained. The disclosed

device provides a tool holder whereby the whole holder's body is made in one piece.

Due to this reason, it is possible to omit a separate polishing process for two parts to

join together, henceforth it improves the overall productivity.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments can be better understood with reference to the following drawings

and description. The components in the figures are not necessarily to scale, the

emphasis instead being placed upon illustrating the principles of the embodiments.

Moreover, the figures, like reference numerals designate corresponding parts

throughout the different views.

Reference will be made to embodiments of the invention, examples of which may be

illustrated in the accompanying figures. These figures are intended to be illustrative,

not limiting. Although the invention is generally described in the context of these

embodiments, it should be understood that it is not intended to limit the scope of the

invention to these particular embodiments.

The above and other objects, features, and advantages of the present invention will be

more clearly understood from the following detailed description taken in conjunction

with the accompanying drawings, in which:

Figure 1 illustrates a perspective view of the tool holder for easy clamping and de-

clamping of a tool shank according to embodiments of the present invention.

Figure 2 illustrates an assembled view of the tool holder for easy clamping and de-

clamping of a tool shank according to embodiments of the present invention.

Figure 3 illustrates exploded view of the tool holder for easy clamping and de-

clamping of a tool shank according to embodiments of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The present invention is a device wherein the mechanical assembly constitutes the

operative mechanism and pathways for passage and accurate functioning, by

controlling the actuation of various mechanical components constituting the different

elements that are actuating and controlling the components of the device SO that for

the clamping and de-clamping of the tool by this device can perform their associative

function for executing the method steps thereof of the system for accommodating

varied size and specification of its components for accurate, customized for holding a

tool.

In the following description of this application, it should be noted that the terms

"upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate

the orientation of the device. The positional relationship is based on the position or

positional relationship shown in the drawings, or the position or positional relationship

that the product of this application is usually placed in use, only for the convenience

of describing the application and simplifying the description and does not indicate or

imply the device referred to the element must have a specific orientation, be

constructed and operated in a specific orientation, and therefore cannot be understood

as a limitation of the application. In addition, the terms "first", "second", "third", etc.

are only used for distinguishing description, and cannot be understood as indicating or

implying relative importance. In the description of this application, unless otherwise

specified, "plurality" means two or more.

In the following description of this application, it should also be noted that, unless

otherwise clearly defined and limited, the terms "set" and "connection" should be

understood in a broad sense, for example, it can be a fixed connection or a detachable

connection, or integrally connected; it can be a mechanical connection or an impulsive

connection. For those of ordinary skill in the art, the specific meanings of the above-

mentioned terms in this application can be understood under specific circumstances.

In the following description, for the purpose of explanation, specific details are set

forth in order to provide an understanding of the present invention. It will be apparent,

however, to one skilled in the art that the present invention may be practiced without

these details. One skilled in the art will recognize that embodiments of the present

invention, some of which are described below, may be incorporated into a number of

systems.

The various embodiments of the present invention are disclosed herewith to

provide an improved version of the bevel gear operating adapter in a single form rather

than dividing a holder body SO that verticality which is the centre of the holder remains

unchanged even if components are replaced as necessary.

Furthermore, connections between components within the figures are not intended to

be limited to direct connections. Rather, these components may be modified, re-

formatted, or otherwise changed by intermediary components.

The systems/devices described herein are explained using examples with specific

details for better understanding. However, the disclosed embodiments can be worked

on by a person skilled in the art without the use of these specific details.

Throughout this application, with respect to all reasonable derivatives of such terms,

and unless otherwise specified (and/or unless the particular context clearly dictates

otherwise), each usage of:

"a" or "an" is meant to read as "at least one."

"the" is meant to be read as "the at least one."

References in the present invention to "one embodiment" or "an embodiment" mean

that a particular feature, structure, characteristic, or function described in connection

with the embodiment is included in at least one embodiment of the invention. The

appearances of the phrase "in one embodiment" in various places in the specification

are not necessarily all referring to the same embodiment.

Embodiments of the present invention include various steps, which will be described

below. The steps may be performed by mechanical components or may be embodied

in machine operating instructions, which may be used to cause a general purpose with

the instructions to perform the steps. Alternatively, steps may be performed by a

combination of various elements of the system and/or by human operators and the

method steps of the invention could be accomplished by mechanical systems of the

device or subparts of it.

If the specification states a component or feature "may", "can", "could", or "might" be

included or have a characteristic, that particular component or feature is not required

to be included or have the characteristic.

As used in the description herein and throughout the claims that follow, the meaning

of "a", "an", and "the" includes plural reference unless the context clearly dictates

otherwise. Also, as used in the description herein, the meaning of "in" includes "in"

and "on" unless the context clearly dictates otherwise.

Exemplary embodiments will now be described more fully hereinafter with reference

to the accompanying drawings, in which exemplary embodiments are shown. This

invention may, however, be embodied in many different forms and should not be

construed as limited to the embodiments set forth herein. These embodiments are

provided SO that this invention will be thorough and complete and will fully convey

the scope of the invention to those of ordinary skill in the art. Moreover, all statements

herein reciting embodiments of the invention, as well as specific examples thereof are

intended to encompass both structural and functional equivalents thereof.

Additionally, it is intended that such equivalents include both currently known

equivalents as well as equivalents developed in the future (i.e., any elements developed

that perform the same function, regardless of structure).

Hereinafter, embodiments will be described in detail. For clarity of the description,

known constructions and functions will be omitted. Parts of the description may be

presented in terms of operations performed by a mechanical system, using terms such

as gear, draw screw bar and the like, consistent with the manner commonly employed

by those skilled in the art to convey the substance of their work to others skilled in the

art.

While embodiments of the present invention have been illustrated and described, it

will be clear that the invention is not limited to these embodiments only. Numerous

modifications, changes, variations, substitutions, and equivalents will be apparent to

those skilled in the art, without departing from the spirit and scope of the invention, as

described in the claim.

The present invention is illustrated with reference to the accompanying drawings,

throughout which reference numbers indicate corresponding parts in the various

figures. These reference numbers are shown in bracket in the following description.

Table below enlists the reference numerals and components indicated by them:

Table 1

Reference Numerals Components

100 Tool holder

01 A flange is having a V-shaped cross-section

02 Holding Chuck Body

03 Pinion Bevel Gear Pinion

04 Small Thrust Retaining Annular Ring For The Pinion

05 Polygon Hole In The Pinion

06 Long Thrust Retaining Annular Ring For The Draw

Screw Bar

07 Bevel Gear

08 Tool Holding Adapter

09 Circlip For The Draw Screw Bar

10 10 Circlip For The Pinion

11 Low Friction Washer

12 Low Friction Washer

13 Taper Collet

14 Tool Shank Portion

15 Tool Holding Hole

16 Slotted Slits In Collet

17 17 Collet Insertion Taper Hole With Variable Taper Angle

18 Collet Insertion Hole End Area

19 Female Screw Hole In Collet

20 Male Male Screw ScrewPart PartOfOf TheThe Draw Bar Bar Draw

21 Female Screw Hole In Tool Holding Chuck

22 Male Screw Part Of The Thrust Retaining Annular Ring

23 Outer Guiding Diameter Of The Draw Screw Bar

24 Passage For The Draw Screw

25 Outer Guiding Diameter Of The Retaining Annular Ring

26 26 Retaining Annular Ring Passage

27 Draw Screw Bar Head

28 Pinion Head

29 Draw Screw Bar

30 Back End Face Of The Draw Bar

31 Male Screw Portion Of The Small Thrust Retaining

Annular Ring For Pinion

32 Lateral Hole With Female Internal Thread

Referring to Figures 1, 2 and 3, figure-1 illustrates a perspective view of a tool holder

(100) for easy clamping and de-clamping of a tool shank. The tool holder (100) made

in single form having high strength solid body which can be broadly divided in two

parts, wherein one part is the tool holding chuck body (2) having variety of tapering

size and shape which is suitable for machine spindle and another part is tool holding

adapter (8) having chucking arrangements for clamping and de-clamping of a tool

shank.

Figure 2 illustrates an assembled view of a tool holder(100) for easy clamping and de-

clamping of a tool shank. In this figure, for more clarification a longitudinal sectional

view is provided which is showing a tool holder (100) chuck which includes a flange

(1) is having a V-shaped cross section a tool holding chuck (2), a taper collet (13), a

draw screw with bevel gear(29) and a pinion bevel gear pinion (3), small thrust

retaining annular ring for the pinion (4), polygon hole in the pinion (5), long thrust

retaining annular ring for the draw screw bar (6), bevel gear (7), tool holding adapter

(8), circlip for the draw screw bar (9) circlip for the pinion (10), low friction washer

(11 and 12), taper collet (13), tool shank portion (14), tool holding hole (15), slotted

slits in collet (16), collet insertion taper hole with variable taper angle (17), collet

insertion hole end area (18), female screw hole in collet (19), male screw part of the

draw bar (20), female screw hole in tool holding chuck (21), male screw part of the

thrust retaining annular ring (22), outer guiding diameter of the draw screw bar(23), passage for the draw screw (24), outer guiding diameter of the retaining annular ring

(25), retaining annular ring passage (26), draw screw bar head (27) ,pinion head (28)

, draw screw bar (29), , back end face of the draw bar(30), male screw portion of the

small thrust retaining annular ring for pinion (31), lateral hole with female internal

thread (32).

Figure 3 illustrates an exploded view of a tool holder (100) for easy clamping and de-

clamping of a tool shank. The exploded view provides constructional details and

arrangement of the internal components which can be assembled or dismantled for

maintenance.

In an embodiment of the present invention, the tool holding chuck body (2) is having

a taper shank portion at the back end which is tapered toward the end and is formed on

the outer periphery thereof to match the same with the machine spindle taper. The axial

center of the taper shank coincides with the central axis O (not shown) of the tool

holding chuck body (2). The tapered shank is inserted into the spindle of a machine

tool (not shown). A flange (1) is having a V-shaped cross-section extending in the

circumferential direction formed on an outer periphery of a tip portion of the chuck

body (2)essential for automatic tool change process in the machine.

According to an embodiment of the present invention, the device consists of the front

portion of the tool holding the chuck body (2) which is a cylindrical member having a

collet insertion hole at the center. The collet insertion hole coincides with the axis O

(not shown) of the tool holding chuck body (2) and it is conical in shape which expands

toward the front end (17). On the other hand, the end region (18) of the collet insertion

hole has a substantially constant diameter in the axial direction.

According to an embodiment of the present invention, the device consists of the taper

collet (13) which is inserted into the collet insertion hole from the front-end side (17)

of the tool holding chuck (2) and moves inside along the collet insertion hole towards

end area(18). In this device at the center of the taper collet (13), a tool holding hole

(15) extending from the tip to the end of the taper collet (13) is formed. In the tip region

of the taper collet (13), a slit (16) extending in parallel direction with the axis O (not

shown) is formed. In this device, there is equal-sized slots (16) are provided at intervals in the circumferential direction. The outer diameter of the tip region of the taper collet

(13) expands toward the tip (17). The female screw hole (19) is formed at the bottom

end of the taper collet (13). The female screw hole (19) continuously extends from the

back of the tool holding hole (15) and it is screwed with the male screw portion (20)

of the draw screw (29).

According to an embodiment of the present invention, the device consists of the draw

screw (29) which has a large diameter head (27) at the bottom end and a small diameter

male screw (20) located at the tip end. The female screw (21) is formed on the inner

diameter of the collet insertion hole at the bottom side, and the thrust retaining annular

ring (6) having threads at the tip (22) is screwed into this female screw (21).

According to an embodiment of the present invention, the device consists of the

retaining ring (6) which engages with the back side of the bevel gear (7) to prevent the

bevel gear (7) from coming out through the collet insertion hole. It has a ring-like

shape having an outer diameter and an inner diameter corresponding to the outer

diameter of the neck lower portion of the draw screw (29). The axial position of the

retaining ring (6) can be adjusted by rotating the retaining ring (6) in the tightening

direction or the loosening direction. A low friction member (12) interposes between

the back-end side of the bevel gear (7) and the retaining ring (6). The low friction

member (12) is for reducing the frictional resistance between the back-end face of the

bevel gear (7)and the bottom-end face of the retaining ring (6) while rotation of the

bevel gear (7). For smooth operation, a metal bearing washer having a thickness of

1.50 to 2.00 mm is provided. These bearings are derived from low friction processing

such as ion nitriding processing, DLC (Diamond Like Carbon) coating processing, TiN

coating processing, cryogenic treatment, and mirror surface lapping processing for

reducing frictional resistance with the back-end face of the bevel gear (7) and the

bottom end face of the retaining ring (6) as well as on both surfaces of the low friction

member (12). As a result, the axis of the draw screw (29) is centered SO as coincide

with the axis O. Further, the rotational efficiency of the draw screw (29) is improved

to draw the taper collet (13) inside the tool holding chuck (2) therefore user requires

very little force SO that user can chuck the shank portion of the tool (14) easily.

According to an embodiment of the present invention, the device consists of the bevel

gear pinion (3) serving as a bevel gear put inside of the lateral hole (32). An umbrella-

like tooth formed at the outer edge of the bottom end of the bevel gear pinion (3)

meshes with a bevel gear (7) formed at the end of the head of the draw screw(29)A

polygonal hole (5) is provided for rotating the bevel gear pinion (3) which is formed

on the top end of the bevel gear pinion (3). In this disclosed device a female screw (32)

is formed on the outer diameter side of the lateral hole, and the thrust retaining annular

ring (4) is screwed into the female screw (32). The retaining annular ring (4) engages

with the bevel gear (7) to prevent the bevel gear pinion (3) from coming out of the

lateral hole (32) to the outside diameter side. The axial position of the retaining annular

ring (4) can be adjusted by rotating the retaining annular ring (4) in the tightening

direction or the loosening direction.

In an embodiment of the present invention, a low friction member (11) intervenes

between the bevel gear pinion (3) and the thrust retaining annular ring (4). The low

friction member (11) is for reducing the frictional resistance between the top end face

of the bevel gear pinion (3) and the bottom end face of the retaining ring (4) when the

bevel gear pinion (3) rotates. There is a low friction processing such as ion nitriding

processing, DLC (Diamond Like Carbon) coating processing, TiN coating processing,

cryogenic treatment, and mirror surface lapping processing for reducing frictional

resistance with the top end face of the bevel gear pinion (3) and the bottom end face

of retaining annular ring (4) as well as on both surfaces of the low friction member (11

and 12) .

In an embodiment of the present invention, a working procedure for chucking the

shank portion (14) of the tool using the tool holding chuck (2) is described below.

Firstly, the taper collet (13) is inserted into the collet insertion hole (17), and then

female screw hole (19) at the end of the taper collet (13) is loosely screwed into the

male screw portion (20) at the tip of the draw screw (29).

The shank portion (14) of the tool is inserted into the tool holding hole (15) in a state

where the draw screw (29) is loosened in advance by the bevel gear pinion (3). In

further process, a screwdriver is inserted into the central hole of the retaining ring (4), and the tip of the adjustment tool is engaged with the polygonal hole (5) of the bevel gear pinion (3). The bevel gear pinion (3) is rotated in the tightening direction. As a result, the bevel gear (7) rotates in the tightening direction, and the draw screw (29) draws the taper collet (13) deep into the collet insertion hole (17). At this time, the provided slit (16) of the taper collet (13) is compressed by the tapered hole (17) which becomes thinner toward the end of the end hole, and the diameter of the tool holding hole (15) is reduced. Thus, the shank portion (14) of the tool is grasped with uniform force over the entire circumference.

On the contrary, to un-chuck the shank portion (14) it is preferable to rotate the bevel

gear pinion (3) in the loosening direction by the adjusting tool. The bevel gear pinion

(3) has an outer peripheral surface in contact with the inner peripheral surface of the

lateral hole (32) and it is centered by the inner peripheral surface of the lateral hole

(32). As a result, the bevel gear (7) and the bevel gear pinion (3) can mesh in an

appropriate state for smooth operation.

In a similar way, the bevel gear (7) has an outer peripheral surface in contact with the

inner peripheral surface of the lateral hole (25) and is centered by the inner peripheral

surface of the lateral hole (25). As a result, the bevel gear (7) and the bevel gear pinion

(3) can mesh in an appropriate state.

Advantages of the invention

The disclosed device(100) provides a tool holder for cutting-tool clamping which

allows a cutting tool, such as a drill or an end mill, or a side milling cutter, to be easily

clamped or de-clamped to the head part of a machine tool at the time of drilling,

reaming or milling on a machining center.

The disclosed device (100) provides a tool holder which allows a drawbar screw

bevel gear and a pinion to be installed inside a holder as a single unit, rather than

dividing a holder body, SO that verticality which is the center line of the holder remains

unchanged even if drawbar screw bevel gear and/or a pinion are replaced as necessary.

The disclosed device (100) provides a tool holder in which improved design is

provided to develop a holder in a single unit, with modified bevel gear and pinion ratio

to 1:1 (Miter gear). Due to this a small bevel gear can be easily inserted into the collet cavity and put in the place. Therefore, without affecting the functionality can perform all operations in an efficient manner and with precision in the present invention.

The disclosed device (100) provides a tool holder in a single unit. Due to this, there

is no form of extended circumferential flange ring. Therefore, useful adapter length

can be fully utilized in deep machining without any foul.

The disclosed device (100) provides a tool holder in a single unit, therefore

manufacturing processes can be completed in one setting without a disturbing center

line of the holder. Thereby reducing manufacturing costs.

The disclosed device (100) provides a tool holder in which the configuration of

the holder can be simplified to reduce the number of parts, therefore reducing the

production cost.

The disclosed device (100) provides a tool holder as a single unit SO that a damaged

holder can be repaired and refurbished anywhere with OEM spare parts.

The disclosed device (100) provides a tool holder wherein the holder body is

formed in one piece, even if the component is replaced, the vertical degree is prevented

in advance so that the precision of the holder body can constantly be maintained.

The disclosed device (100) provides a tool holder with no chance of torque

leakage.

The disclosed device (100) improves overall productivity due to its single-piece

structure as the need for a separate polishing process of two parts to join them together

is completely eliminated.

From the above description, it can be seen that the device of the present

invention provides an improved version of the bevel gear operating adapter which

operates in a single form rather than dividing a holder body SO that verticality which

is the centre of the holder remains unchanged even if the driving screw gear and spindle

are replaced as per the necessity of the user. Henceforth, for solving the problems of

the prior art. for clamping and de-clamping the tool holder is provided with an

improved version of the bevel gear operating adapter to achieve zero torque leakage.

According to the present invention, the disclosed device can be used for various tool

holding purposes which is simple in structure, high in strength, and in less

manufacturing cost.

The foregoing descriptions of specific embodiments of the present invention have been

presented for purposes of illustration and description. They are not intended to be

exhaustive or to limit the present invention to the precise forms disclosed, and

obviously many modifications and variations are possible in light of the above

teaching. The embodiments were chosen and described in order to best explain the

principles of the present invention and its practical application, thereby enabling others

skilled in the art to best utilize the present invention and various embodiments with

various modifications as are suited to the particular use contemplated. It is understood

that various omissions and substitutions of equivalents are contemplated as

circumstance may suggest or render expedient, but such are intended to cover the

application or implementation without departing from the scope of the present

invention.

Claims

We Claim,

1) A single unit tool holder device (100) for easy clamping and de-clamping

comprising a tool shank which consist of V-shaped groove (1), tool holding chuck

body(2) , pinion bevel gear pinion (3), small thrust retaining annular ring for the

pinion(4), polygon hole in the pinion (5), long thrust retaining annular ring for the

draw screw bar (6), bevel gear (7), tool holding adapter (8), circlip for the draw screw

bar (9) circlip for the pinion (10), low friction washer (11 and 12), taper collet

(13), tool shank portion (14), tool holding hole (15), slotted slits in collet (16), collet

insertion taper hole with variable taper angle (17), collet insertion hole end area

(18), female screw hole in collet (19) , male screw part of the draw bar (20), female

screw hole in tool holding chuck (21), male screw part of the thrust retaining annular

ring (22), outer guiding diameter of the draw screw bar(23), passage for the draw

screw (24), outer guiding diameter of the retaining annular ring (25), retaining annular

ring passage (26), draw screw bar head (27),pinion head (28) , draw screw bar

(29), back end face of the draw bar(30), male screw portion of the small thrust

retaining annular ring for pinion(31), lateral hole with female internal thread (32);

characterised in that

a tool holding chuck body (2) having a taper shank portion at back end which

is tapered toward the end is formed on the outer periphery to match the same

with machine spindle taper; the front portion of the tool holding chuck body(2)

is a cylindrical member having a collet insertion hole at the center; the collet

insertion hole coinciding the tool holding chuck (2) provided in conical shape

which expands toward the front-end side (17);

a flange(1) is having a V-shaped cross-section extending in the circumferential

direction which is provided on an outer periphery of a tip portion of the chuck

body (2);

a taper collet (13) is inserted into the collet insertion hole from the front-end

side (17) of the tool holding chuck (2) which moves inside along the collet

insertion hole towards (18) the end; at the center of the taper collet (13), a tool holding hole (15) is provided which is extending from the tip to the end of the taper collet (13) ; a draw screw (29) having a large diameter head (27) at the bottom end and a small diameter male screw (20) locating at the tip end; a female screw (21) is provided on the inner diameter of the collet insertion hole(18) at the bottom side and the thrust retaining annular ring (6) having threads at the tip (22) which is screwed into female screw (21); a retaining ring (6) engages with the back side of the bevel gear (7) to prevent the bevel gear (7) from coming out through the collet insertion hole thereon a ring-like shape provided on an outer diameter and an inner diameter corresponding to the outer diameter of the neck lower portion of the draw screw

(29);

the axial position of the retaining ring (6) is adjusted by rotating the retaining

ring (6) in the tightening direction or the loosening direction;

a low friction member (12) interposes between the back-end side of the bevel

gear (7) and the retaining ring (6); and it is provided for reducing the frictional

resistance between the back-end face of the bevel gear (7) and the bottom-end

face of the retaining ring (6) when the bevel gear (7) rotates;

and wherein the draw screw (29) rotates while drawing in the taper collet (13)

inside the hole to clamp or de-clamp the tool holding chuck (2) to chuck the

shank portion of the tool (14) with little force;

and wherein the working procedure of chucking the shank portion (14) of the

tool by tool holding chuck (2) comprises:

the taper collet (13) inserting into the collet insertion hole (17), and the

female screw hole (19) at the end of the taper collet (13) is loosely screwed

into the male screw portion (20) at the tip of the draw screw (29);

the shank portion (14) of the tool is inserted into the tool holding hole (15)

in a state where the draw screw (29) is loosened in advance by the bevel

gear pinion (3).

the screwdriver inserting into the central hole of the retaining ring (4), the

tip of the adjustment tool engages with the polygonal hole (5) of the bevel

gear pinion (3) and the pinion (3) is rotated in the tightening direction; the bevel gear (7) rotates in the tightening direction, and the drawing screw

(29) draws the taper collet (13) deep into the collet insertion hole (17), the

provided slit (16) of the taper collet (13) is compressing by the tapered hole

(17) which becomes thinner toward the end of the end hole, and the

diameter of the tool holding hole (15) is reduced,

the shank portion (14) of the tool is grasped with uniform force over the

entire circumference.

2) The single unit tool holder device (100) for easy clamping and de-

clamping according to claim 1, wherein a bevel gear pinion (3) serving as a bevel gear

is put inside the lateral hole (32); an umbrella-like tooth provided at the outer edge of

the bottom end of the bevel gear pinion (3) which meshes with a bevel gear (7) at the

end of the head of the draw screw(29). - 3) The single unit tool holder device (100)

for easy clamping and de-clamping according to claim 1, wherein a polygonal hole (5)

for rotating the bevel gear pinion (3) is formed on the top end of the bevel gear pinion

(3).

4) The single unit tool holder device (100) for easy clamping and de-clamping

according to claim 1, wherein a female screw (32) is formed on the outer diameter side

of the lateral hole and the thrust retaining annular ring (4) is screwed into the female

screw (32).

5) The single unit tool holder device (100) for easy clamping and de-clamping

according to claim 1, wherein the retaining ring (4) engages with the bevel gear (7) to

prevent the bevel gear pinion (3) from coming out of the lateral hole (32) to the outside

diameter side.

6) The single unit tool holder device (100) for easy clamping and de-clamping

according to claim 1, wherein the axial position of the retaining annular ring (4) is

adjusted by rotating the retaining ring (4) in the tightening direction or the loosening

7) The tool holder device (100) for easy clamping and de-clamping according to

claim 1, the working procedure of un-chucking the shank portion (14) of the tool

by tool holding chuck (2) : the shank portion (14) is rotating the bevel gear pinion (3) in the loosening direction by the adjusting tool; the bevel gear pinion (3) having an outer peripheral surface in contact with the inner peripheral surface of the lateral hole (32) and is centered by the inner peripheral surface of the lateral hole (32); wherein the bevel gear (7) and the bevel gear pinion (3) mesh with in an appropriate state for un-chucking the shank portion (14)

8) The single unit tool holder device (100) for easy clamping and de-clamping

according to claim 1, wherein the gear ratio of bevel gear (7) and bevel gear pinion

(3) with a single gear ratio.

Fig. 1 A perspective view of tool holder device for clamping and de-clamping of

tool shank

($)

yes you ($) NO 1853 easy 000 an (3) yes 83 $2 0189 42 as 37 3 yes (II) (23) $ (18) on 00

- $ with

as & use 30 30 an NO

-W 600

& sin

# N on (3)

Fig. 2 An assembled view of tool holder device for clamping and de-clamping - of

tool shank not to is: to 200 to 50 RS

100 .... MR. 12: 338 (6----- (G----- 20 ******** 300 isl - (3) - : % se KW (5) 500 too by low (00 (-5) .... IN MN

-- we

30 (AN) (00 NO (I) on we 000 NN .... (X) ex W 3

Fig. 3 An exploded view of tool holder device for clamping and de-clamping of

tool shank