GB2395455A - Hand tool machine - Google Patents

Hand tool machine Download PDF

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Publication number
GB2395455A
GB2395455A GB0326838A GB0326838A GB2395455A GB 2395455 A GB2395455 A GB 2395455A GB 0326838 A GB0326838 A GB 0326838A GB 0326838 A GB0326838 A GB 0326838A GB 2395455 A GB2395455 A GB 2395455A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
hand tool
characterized
deep
tool machine
machine according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0326838A
Other versions
GB0326838D0 (en )
GB2395455B (en )
Inventor
Otto Baumann
Dietmar Saur
Andre Ullrich
Michael Weiss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06Hammer pistons; Anvils ; Guide-sleeves for pistons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2217/00Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011Details of anvils, guide-sleeves or pistons
    • B25D2217/0019Guide-sleeves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/191Ram catchers for stopping the ram when entering idling mode

Abstract

A hand tool machine particularly in the form of a drilling or percussion hammer comprises a motor-driven impact mechanism (12), in which a striker (14) is connected preferably by an air cushion to a reciprocating driving element and delivers its energy via an impact body (18), which is guided in an axially movable manner in a guide part (19), to a tool (17) guided in a tool holder (16). The guide part (19) is formed from a deep-drawn part particularly in the form of a deep-drawn guide sleeve (21).

Description

Hand tool machine, in particular a drilling or percussion hammer 5

Background art

The invention proceeds from a hand tool machine, in particular a drilling or percussion hammer, of the type defined in the preamble of claim 1.

In a known hand tool machine of said type (DE 33 29 0005 Al) the guide part for the axially movably guided impact body comprises a special guide body, which is inserted into the guide tube, which guides the striker and also the 15 piston of the impact mechanism, and is fixed therein in an axially non-displaceable manner. In respect of guidance of the impact body, high standards of geometrical and dimensional accuracy are required of said guide body. One way of attempting to meet said requirements is by cutting 20 or grinding the guiding diameter and/or the guiding contour of said guide body as accurately as possible. These production methods for manufacturing the guide diameter and/or the guide contour are very costintensive.

25 Advantages of the invention In contrast, the hand tool machine according to the invention having the features in claim 1 has the advantage that by virtue of designing the guide part as a deep-drawn 30 part, in particular in the form of a deep-drawn guide sleeve, a large cost reduction is achieved simultaneously with attainment of a very high dimensional and geometrical accuracy. Because of said design it is possible to manufacture very large piece numbers of parts of very good

surface quality and, owing to fixing of the shape, of a very high dimensional and geometrical accuracy. What is more, owing to the shapefixed method of manufacture more flexible configurations of the guide geometry are possible.

Advantageous developments and improvements of the hand tool machine indicated in claim 1 are possible by virtue of the measures outlined in the further claims.

10 Drawing An embodiment of the invention is illustrated in the drawing and described in detail below. The drawing shows a diagrammatic longitudinal section of part of a hand tool 15 machine in the form of a drilling hammer with a tool indicated merely by dashes, wherein the percussion drilling position is shown above the longitudinal centre line and the no-load position is shown below it.

20 Description of the embodiments

The drawing shows part of a hand tool machine 10, which is designed as a drilling or percussion hammer and comprises a housing 11 with an electric drive motor (not shown in 25 detail), a gear unit and an impact mechanism 12, which is at least partially disposed in the interior of a guide tube 13. The impact mechanism 12 comprises a striker 14, which is guided in a sealed and sliding manner in the guide tube 13, as well as a nonillustrated driving element e.g. 30 in the form of a piston, which is likewise guided in a sealed and sliding manner in the guide tube 13. Disposed in the wall of the guide tube 13 are bores 15 serving as air ducts, which may be opened and closed in a known manner

in front of the striker 14. In the non-visible region between the striker 14 and the driving element an air cushion is generated under the influence of the reciprocating driving element and is the means of setting 5 the striker 14 in oscillating motion, wherein the striker 14 delivers its energy in axial direction to a tool 17 guided in a tool holder 16. This occurs in a known manner by means of an approximately pin- shaped impact body 18, which is disposed between the striker 14 and the 10 tool 17 and guided in an axially movable manner in a guide part 19. Each time the striker 14 strikes the impact body 18, the impact energy is transmitted to the tool 17 inserted into the tool holder 16.

15 The drawing shows, above the longitudinal centre line 20 of the hand tool machine 10, the percussion drilling position, in which the tool 17 presses with its - in the drawing -

right end axially against the impact body 18. The position shown below the longitudinal centre line 20 is the no-load 20 position, in which the tool 17 is not pressed into contact.

The guide tube 13 extends inside a cylindrical sleeve 30, which continues in the drawing via a shoulder 31 with a radial step integrally as far as the tool holder 16. Held 25 inside the sleeve 30 is a striker catch device 32, which in the one axial direction is fixed by means of a ring 33, e.g. a snap ring, and in the other axial direction is supported by means of a damping ring 34 axially in relation to the tool holder 16. The striker catch device 32 30 comprises a holder 35 having an annular groove 36, which is open towards the longitudinal centre line 20 and in which a ring 37, in particular an O-ring, is accommodated. Said striker catch device 32 is used to achieve better no-load

performance. In the no-load position of the striker 14 shown below the longitudinal centre line 20 the ring 37 provides a radial catch force, which acts upon the striker 14 and has the effect that in the non-engaged state 5 of the tool 17 the striker 14 remains in the no-load position. This has the advantage of a more pleasant noise, less vibration and moreover leads to increased durability and a longer service life.

10 The guide part 19, which receives and guides the pin-shaped impact body 18, is centred in the sleeve 30 and held in an axially non- displaceable manner. The impact body 18 has to be axially slightly movable inside the guide part 19 in order to make use, as far as possible, of the total impact 15 energy. To said end and in order to achieve a long service life, the radial play and also the tilting play between the impact body 18 and the guide part 19 should be only very slight. The guidance of the impact pin 18 by means of the guide part 19 therefore has to meet high standards of 20 geometrical and dimensional accuracy. At the same time, the outlay for manufacture of the guide part 19 is to be as low as possible. This is achieved in that the guide part 19 is formed from a deep-drawn part, which in particular is designed as a deep-drawn guide sleeve 21. It 25 is therefore possible to manufacture very high piece numbers of very good surface quality and, owing to fixing of the shape, of a very high dimensional and geometrical accuracy, thereby achieving a high geometrical and dimensional accuracy for the guidance of the impact body 30 18, and achieving it with a considerably reduced manufacturing outlay. What is more, owing to the fixed-

shape method of manufacture more flexible configurations of the guide geometry are possible.

It is advantageous when the impact body 18 at the periphery interacts in a sealing manner with the associated inner peripheral surface 22 of the guide sleeve 21, so that the 5 impact body 18 may also additionally perform a sealing function. The impact body 18 has on its periphery a sealing ring 23, e.g. an O-ring. The inner peripheral surface 22 of the guide sleeve 21 is designed as a sealing surface, so that the guide sleeve 21 is not only used to 10 guide the impact body 18 but simultaneously serves as a sealing diameter.

The deep-drawn part in the form of the guide sleeve 21 has on one end situated on the right in the drawing a radially 15 inwardly directed annular edge 24, which acts as an axial end stop for the impact body 18 upon the movement to the right in the drawing. On the other end the guide sleeve 21 has a radially outwardly directed flange 25, which in the direction of the tool holder 16 is axially supported 20 against the shoulder 31. The sleeve 30 together with the shoulder 31 and the tool holder 16 forms an integral component. The deep-drawn part, in particular the deep-

drawn guide sleeve 21, is accommodated and centred in the sleeve 30. For centring purposes, the guide sleeve 21 25 carries at least one centring element 26, which centres the guide sleeve 21 in the sleeve 30 and in the illustrated embodiment comprises a single cylindrical body 27. In the direction of the tool holder 16 the at least one centring element 26 axially abuts the flange 25 of the guide 30 sleeve 21. Between the other end of the centring element 26 and the holder 35 of the striker catch device 32 the damping ring 34 is disposed. Thus, by virtue of the axial fixing of the holder 35 by means of the ring 33, the

t guide sleeve 21 and its at least one centring element 26 are fixed axially in the sleeve 30.

The guide part 19 of the described type associated with the 5 impact body 18 is extraordinarily inexpensive to manufacture with a very good surface quality, particularly in the region of the inner peripheral surface 22 and the outer peripheral surface, while at the same time a very high dimensional and geometrical accuracy is achieved.

10 This leads to very smooth axial running of the guided impact body 18, which also additionally performs a sealing function, and to a very long service life of the impact body 18 and of the associated guide part 19.

Claims (13)

Claims
1. Hand tool machine, in particular a drilling or percussion hammer, comprising a motor-driven impact 5 mechanism (12), in which a striker (14) is connected preferably by an air cushion to a reciprocating driving element and delivers its energy via an impact body (18), which is guided in an axially movable manner in a guide part (19), to a tool (17) guided in 10 a tool holder (16), characterized in that the guide part (19) is formed from a deep-drawn part.
2. Hand tool machine according to claim 1, characterized in that the deepdrawn part is designed as a deep 15 drawn guide sleeve (21).
3. Hand tool machine according to claim 1 or 2, characterized in that the impact body (18) at the periphery interacts in a sealing manner with the 20 associated inner peripheral surface (22) of the deep drawn part, in particular of the guide sleeve (21).
4. Hand tool machine according to one of claims 1 to 3, characterized in that the impact body (18) on its 25 periphery has a sealing ring (23), e. g. an O-ring.
5. Hand tool machine according to one of claims 1 to 4, characterized in that the inner peripheral surface (22) of the deep-drawn part, in particular of the 30 guide sleeve (21), is designed as a sealing surface.
6. Hand tool machine according to one of claims 1 to 5, characterized in that the deep-drawn part, in
particular the guide sleeve (21), has on one end a radially inwardly directed annular edge (24) as an axial end stop for the impact body (18).
5
7. Hand tool machine according to one of claims 1 to 6, characterized in that the deep-drawn part, in particular the guide sleeve (21), has on the other end a radially outwardly directed flange (25), which in the direction of the tool holder (16) is supported 10 axially against a shoulder (31).
8. Hand tool machine according to one of claims 1 to 7, characterized in that the deep-drawn part, in particular the guide sleeve (21), is accommodated and 15 centred in a sleeve (30).
9. Hand tool machine according to claim 8, characterized in that the shoulder (31) and/or the sleeve (30) are integral with the tool holder (16).
10. Hand tool machine according to one of claims 7 to 9, characterized in that the shoulder (31) and the sleeve (30) are integral with one another.
25
11. Hand tool machine according to one of claims 1 to 10, characterized in that the deep-drawn part, in particular the guide sleeve (21), for its centring in the sleeve (30) carries at least one centring element (26), e.g. a cylindrical body (27).
12. Hand tool machine according to claim 11, characterized in that the centring element (26), in particular the cylindrical body (27), in the direction of the tool
holder (16) axially abuts the flange (25) of the deep drawn part, in particular of the guide sleeve (25).
13. A hand tool machine substantially as herein described 5 with reference to the accompanying drawings.
GB0326838A 2002-11-20 2003-11-18 Hand tool machine, in particular a drilling or percussion hammer Expired - Fee Related GB2395455B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2002153973 DE10253973A1 (en) 2002-11-20 2002-11-20 Hand tool, in particular drilling or hammer

Publications (3)

Publication Number Publication Date
GB0326838D0 GB0326838D0 (en) 2003-12-24
GB2395455A true true GB2395455A (en) 2004-05-26
GB2395455B GB2395455B (en) 2005-07-20

Family

ID=29762171

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0326838A Expired - Fee Related GB2395455B (en) 2002-11-20 2003-11-18 Hand tool machine, in particular a drilling or percussion hammer

Country Status (3)

Country Link
CN (1) CN100341670C (en)
DE (1) DE10253973A1 (en)
GB (1) GB2395455B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1872910A2 (en) 2006-07-01 2008-01-02 Black & Decker, Inc. A beat piece wear indicator for a hammer drill
WO2009103362A1 (en) * 2008-02-20 2009-08-27 Robert Bosch Gmbh Handheld machine tool

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2109739A (en) * 1981-11-13 1983-06-08 Black & Decker Inc A power tool having a plastics material housing
US5373905A (en) * 1991-07-08 1994-12-20 Robert Bosch Gmbh Hammer drill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2109739A (en) * 1981-11-13 1983-06-08 Black & Decker Inc A power tool having a plastics material housing
US5373905A (en) * 1991-07-08 1994-12-20 Robert Bosch Gmbh Hammer drill

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1872910A2 (en) 2006-07-01 2008-01-02 Black & Decker, Inc. A beat piece wear indicator for a hammer drill
EP1872910A3 (en) * 2006-07-01 2011-11-30 Black & Decker, Inc. A beat piece wear indicator for a hammer drill
WO2009103362A1 (en) * 2008-02-20 2009-08-27 Robert Bosch Gmbh Handheld machine tool
US8272453B2 (en) 2008-02-20 2012-09-25 Robert Bosch Gmbh Handheld power tool

Also Published As

Publication number Publication date Type
GB0326838D0 (en) 2003-12-24 grant
DE10253973A1 (en) 2004-06-03 application
CN100341670C (en) 2007-10-10 grant
CN1502448A (en) 2004-06-09 application
GB2395455B (en) 2005-07-20 grant

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20151118