DE202020106203U1 - A combined hole opener with quick assembly - Google Patents

Abstract

A combined hole opener with quick assembly, comprising a central drill (1) and a hole saw (2), the hole saw being detachably connected to the central drill, characterized in that the hole opener comprises a clamping sleeve (3), the central drill running through the clamping sleeve and is fixedly connected to the clamping sleeve, and the hole saw has a central hole (22) for attaching the clamping sleeve; and
the clamping sleeve comprising an outer sleeve (32) and an inner sleeve (33), the outer sleeve having a first inner hole (321) which is a blind hole and the bottom of which is conical, the inner sleeve being attached in the first inner hole and two clamping plates ( 331) which are arranged opposite one another and are connected to one another by a pressing plate (332), the pressing plate being located at one end of the respective clamping plates, the outwardly facing side of the pressing plate having a hollow structure; and
wherein the side wall of the clamping sleeve is provided with positioning blocks (31), the hole saw having two grooves (21) for receiving the positioning blocks, each groove having an inlet groove (211) and a positioning groove (212), the inlet groove and the positioning groove one Form L-shape, wherein each inlet groove is provided with a blocking block (213), which can be driven by a spring element (214) to move in the direction of the opening of the inlet groove and is movable when the spring element is pressed to the bottom of the inlet groove, and each blocking block is one Includes hand lever (2131) which protrudes from the hole saw.

Description

Technical area

The invention belongs to the technical field of power tools and relates in particular to a combined hole opener with quick assembly.

State of the art

A hole opener is a circular saw for processing circular holes. It can open holes in metal, wood, plastic, glass, stone and other materials. Due to its simple and flexible operation and convenient portability, it has a wide range of applications.

Today's hole openers mainly consist of a center drill and a hole saw. The two are generally made into a one-piece tool by welding and other processes, or the combination is bolted to a nut. The one-piece tool becomes completely unusable if it is only partially damaged. The combined tool is screwed with a nut in use, which is very inconvenient because the screw cap can easily loosen.

Content of the invention

The present invention provides a combined hole opener with quick assembly. The central drill is clamped in a clamping sleeve by two clamping plates. And with the force of the drill bit while drilling, the clamping plates are driven to move towards the hollow part, thus increasing the clamping force on the center drill and ensuring the clamping effect. The collet is installed in the slots of the hole saw through positioning blocks. The inlet groove and positioning groove form an L shape. And the inlet groove is provided with a blocking block to prevent the positioning block from falling out (preventing the center drill from falling out). The blocking block blocks automatically with the help of a spring element. When dismantling, only the hand lever has to be pressed so that the positioning block can slide out of the inlet groove.

• Ein kombinierter Lochöffner mit Schnellmontage. Er umfasst einen Mittelbohrer und eine Lochsäge, die miteinander abnehmbar verbunden sind, sowie eine Klemmhülse zum Festklemmen des Mittelbohrers. Die Lochsäge hat ein Mittelloch zum Installieren der Klemmhülse.

The technical solution of this invention is as follows:

• A combined hole opener with quick assembly. It comprises a central drill and a hole saw, which are detachably connected to one another, as well as a clamping sleeve for clamping the central drill. The hole saw has a center hole for installing the collet.

The clamping sleeve comprises an outer and an inner sleeve. The outer sleeve has a "first inner hole", which is a blind hole and the bottom of the hole is conical. The inner sleeve is mounted in the "first inner hole" and contains two clamping plates that are arranged opposite one another. The two clamping plates are connected by a press plate located at one end of the two clamping plates. The outward facing side of the press plate is hollow.

The side wall of the outer sleeve is provided with two positioning blocks. The hole saw has two grooves into which the positioning blocks can be inserted. Each groove also contains the inlet groove and the positioning groove. The inlet groove and the positioning groove form an L shape. Each inlet groove is provided with a blocking block which is driven by a spring element to move towards the opening of the inlet groove. When the spring element is compressed, the blocking block can move to the bottom of the inlet groove. Each blocking block has a hand lever that protrudes from the hole saw.

The outer shell is preferably provided with a “second inner hole” which has a smaller diameter than the “first inner hole”. The “first inner hole” and the “second inner hole” are arranged coaxially.

The surface of the inner side wall of the clamping plates preferably has a number of non-slip bulges.

The two positioning blocks are preferably arranged symmetrically to one another and the grooves are located on opposite sides of the central hole.

The positioning block and the clamping sleeve are preferably separable from one another and can be connected to one another by an interference fit.

The spring element is preferably a spiral compression spring.

The groove bottom of the inlet groove preferably has a receiving groove which can receive the blocking block.

• Bei diesem kombinierten Lochöffner mit Schnellmontage ist der Mittelbohrer in einer Klemmhülse von zwei Klemmplatten festgeklemmt. Und mit der Kraft des Bohrers während des Bohrens werden die Klemmplatten so angetrieben, dass sie sich in Richtung des hohlen Teils bewegen, so dass die Klemmkraft auf den Mittelbohrer erhöht und der Klemmeffekt sichergestellt wird. Die Klemmhülse wird durch Positionierblöcke in den Nuten der Lochsäge installiert. Die Einlassnut und Positioniernut bilden eine L-Form. Und die Einlassnut ist mit einem Blockierblock versehen, um ein Herausfallen des Positionierblocks zu verhindern (wodurch ein Herausfallen des Mittelbohrers verhindert wird). Der Blockierblock blockiert mit Hilfe eines Federelements automatisch. Bei der Demontage muss nur der Handhebel gedrückt werden, damit der Positionierblock aus der Einlassnut herausgleiten kann.

Particular advantages of the present invention are as follows:

• With this combined hole opener with quick assembly, the central drill is clamped in a clamping sleeve by two clamping plates. And with the force of the drill bit while drilling, the clamping plates are driven to move towards the hollow part, thus increasing the clamping force on the center drill and ensuring the clamping effect. The collet is installed in the slots of the hole saw through positioning blocks. The inlet groove and positioning groove form an L shape. And the inlet groove is provided with a blocking block to prevent the positioning block from falling out (preventing the center drill from falling out). The blocking block blocks automatically with the help of a spring element. When dismantling, only the hand lever has to be pressed so that the positioning block can slide out of the inlet groove.

The above description is only an overview of the technical solution of the present invention. The preferred embodiments of the present invention will now be described in more detail with the accompanying drawings.

Figure list

• 1 Overall Structure View of the Present Invention (Hole Opener)
• 2 View of the structural parts
• 3 View of the clamping sleeve
• 4th enlarged view of part A in 2 (Blocking block separated)
• 5 enlarged view of part A in 2 (Blocking block installed)
• 6th View of the clamping sleeve in parts
• 7th View of the clamping sleeve in cross section
• 8th View of the inner sleeve

Detailed description

The preferred embodiments of the present invention will now be described in detail in conjunction with the accompanying drawings in order that the advantages and features of the present invention may be understood and the scope of this invention may be more clearly understood.

Application example:

As in 1-5 As shown, the present invention is a combined hole opener with quick assembly. It includes a center drill 1 and a hole saw 2 which are detachably connected to one another, and a clamping sleeve 3 . The center drill runs through the collet and is firmly attached to it, and the hole saw has a center hole 22nd to install the clamping sleeve.

The side wall of the collet has two positioning blocks 31 Mistake. The hole saw has two grooves 21st into which the positioning blocks can be inserted. In each groove there is also the inlet groove 211 and the positioning groove 212 contain. The inlet groove and the positioning groove form an L shape. Each inlet groove is provided with a blocking block ( 213 ) which is driven by a spring element (not shown in the figures) to move in the direction of the opening of the inlet groove. When the spring element is compressed, the blocking block can move to the bottom of the inlet groove. Each blocking block has a hand lever 2131 protruding from the hole saw.

In the combined hole opener, the center drill is clamped in the collet, and the collet is installed in the groove of the hole saw through the positioning block. The groove is provided with an inlet groove and a positioning groove, the inlet groove and the positioning groove forming an L-shape, and the inlet groove being provided with a blocking block so that the positioning block is prevented from falling out (i.e., preventing the center drill from falling out) . The blocking block is automatically blocked by a spring element. When dismantling, only the hand lever needs to be pressed down so that the positioning block can slide out of the inlet groove.

In this embodiment, there are two positioning blocks which are arranged symmetrically to each other. And the grooves are on two opposite sides of the center hole. The arrangement of two positioning blocks offers better stability in order to better guarantee the connection between the clamping sleeve and the hole saw.

The positioning block and the clamping sleeve can be separated from one another. This is beneficial for the manufacture and processing of the two parts.

The positioning block is connected to the clamping sleeve by an interference fit. This connection structure ensures the stability of the connection and assembly is quick and easy.

In this embodiment the spring element is a helical compression spring.

The ferrule is a steel ferrule and is transitioned to the center hole. The steel clamping sleeve offers better rigidity and stability. The transition fit of the center hole prevents the clamping sleeve and the center drill from being unstable or unbalanced after installation, which results in better stability.

The bottom of the inlet groove has a receiving groove 2111 on, which receives the blocking block.

When the blocking block is in the receiving groove, the path is free for the positioning block to come out of the groove. It is also possible to do without the receiving groove and instead to make the positioning groove wider.

As in 6-8 shown, the collet comprises an outer sleeve 32 and an inner sleeve 33 . The outer sleeve has a "first inner hole" 321 , which is a blind hole and the hole bottom is conical. The inner sleeve is mounted in the "first inner hole" and contains two clamping plates 331 that are arranged opposite each other. The two clamping plates are through a press plate 332 connected, which is located at one end of the two clamping plates. The outward facing side of the press plate is hollow.

The center drill is installed in the clamping sleeve and is firmly clamped by two clamping plates. With the force of the drill during drilling, the press plate can be moved towards the hollow part, so that the clamping force on the central drill is increased and the clamping effect is ensured.

The outer shell also has a "second inner hole" 322 provided that has a smaller diameter than the "first inner hole". The “first inner hole” and the “second inner hole” are arranged coaxially.

The "second inner hole" is used to dismantle the central drill. A screwdriver is inserted into the "second inner hole" in order to push the central drill out.

The surface of the inner side wall of clamping plates has a series of non-slip bulges that prevent the center drill from slipping and improve the clamping effect.

In the description of the present invention it should be noted that the terms “center”, “top”, “bottom”, “left”, “right”, “vertical”, “horizontal”, “inside”, “outside” etc. are non-binding. The specified position or positional relationship is based on the position or positional relationship recorded in the embodiments and shown in the drawings, or the position or positional relationship usually placed when the product is used. This is only to simplify the description. It does not mean or imply that the device or the respective element must have a specific orientation or be configured and operated in a specific orientation. Therefore, such terms should not be construed as limiting the present invention.

• Bei dem Lochöffner der vorliegenden Erfindung ist der Mittelbohrer in der Klemmhülse montiert und durch zwei Klemmplatten festgeklemmt. Mit der Kraft des Bohrers während des Bohrens werden die Klemmplatten so angetrieben, dass sie sich in Richtung des hohlen Teils bewegen, so dass die Klemmkraft auf den Mittelbohrer erhöht und der Klemmeffekt sichergestellt wird. Die Klemmhülse ist durch Positionierblöcke in den Nuten der Lochsäge installiert. Jede Nut ist mit einer L-förmigen Einlassnut und Positioniernut versehen. Die Einlassnut ist mit einem Blockierblock versehen, um ein Herausfallen des Positionierblocks zu verhindern (wodurch ein Herausfallen des Mittelbohrers verhindert wird). Der Blockierblock blockiert durch ein Federelement automatisch. Bei der Demontage wird der Handhebel nach unten gedrückt, damit der Positionierblock aus der Einlassnut herausgleiten kann.

The working principle of the present invention is as follows:

• In the hole opener of the present invention, the center drill is mounted in the collet and clamped by two clamping plates. With the force of the drill bit during drilling, the clamping plates are driven to move towards the hollow part, thus increasing the clamping force on the center drill and ensuring the clamping effect. The collet is installed in the slots of the hole saw by positioning blocks. Each groove is provided with an L-shaped inlet groove and positioning groove. The inlet groove is provided with a blocking block to prevent the positioning block from falling out (preventing the center drill from falling out). The blocking block blocks automatically with a spring element. During dismantling, the hand lever is pressed down so that the positioning block can slide out of the inlet groove.

The above embodiment is only an example of the application of the utility model and does not represent a restriction for the scope of protection of the utility model.

List of reference symbols

1

Center drill

2

Hole saw

21st

Groove

211

Inlet groove

2111

Groove (for blocking block)

212

Positioning groove

213

Blocking block

2131

Hand lever

22nd

Center hole

3

Clamping sleeve

31

Positioning block

32

Outer sleeve

321

First inner hole

322

Second inner hole

33

Inner sleeve

331

Clamping plate

332

Press plate

Claims (7)

A quick assembly combined hole opener comprising a center drill (1) and a hole saw (2), the hole saw being removably connected to the center drill, thereby characterized in that the hole opener comprises a clamping sleeve (3), wherein the central drill runs through the clamping sleeve and is fixedly connected to the clamping sleeve, and the hole saw has a central hole (22) for attaching the clamping sleeve; and wherein the clamping sleeve comprises an outer sleeve (32) and an inner sleeve (33), the outer sleeve having a first inner hole (321) which is a blind hole and the bottom of which is conical, the inner sleeve being attached in the first inner hole and two clamping plates (331) which are arranged opposite one another and are connected to one another by a pressing plate (332), the pressing plate being located at one end of the respective clamping plates, the outwardly facing side of the pressing plate having a hollow structure; and wherein the side wall of the collet is provided with positioning blocks (31), the hole saw having two grooves (21) for receiving the positioning blocks, each groove having an inlet groove (211) and a positioning groove (212), the inlet groove and the positioning groove Form an L-shape, wherein each inlet groove is provided with a blocking block (213) which can be driven by a spring element (214) to move in the direction of the opening of the inlet groove and is movable when the spring element is pressed to the bottom of the inlet groove, and wherein each blocking block a hand lever (2131) which protrudes from the hole saw. A combined hole opener with quick assembly according to Claim 1 , characterized in that the outer shell is additionally provided with a second inner hole (322) which has a smaller diameter than the first inner hole, the first inner hole and the second inner hole being arranged coaxially. A combined hole opener with quick assembly according to Claim 1 , characterized in that the surface of the inner side wall of clamping plates has a series of non-slip bulges. A combined hole opener with quick assembly according to Claim 1 , characterized in that the number of the positioning blocks is set to two, which are arranged symmetrically to each other, the positioning blocks are located on two opposite sides of the central hole. A combined hole opener with quick assembly according to Claim 1 , characterized in that the positioning block and the clamping sleeve can be separated from one another and connected to one another by an interference fit. A combined hole opener with quick assembly according to Claim 1 , characterized in that the spring element is a helical compression spring. A combined hole opener with quick assembly according to Claim 1 , characterized in that the bottom of the inlet groove has a receiving groove (2111) for receiving the blocking block.

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