AU593449B2 – Handheld appliance
– Google Patents
AU593449B2 – Handheld appliance
– Google Patents
Handheld appliance
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Info
Publication number
AU593449B2
AU593449B2
AU18112/88A
AU1811288A
AU593449B2
AU 593449 B2
AU593449 B2
AU 593449B2
AU 18112/88 A
AU18112/88 A
AU 18112/88A
AU 1811288 A
AU1811288 A
AU 1811288A
AU 593449 B2
AU593449 B2
AU 593449B2
Authority
AU
Australia
Prior art keywords
control elements
handheld
levers
swivelling
tool
Prior art date
1987-06-20
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.)
Ceased
Application number
AU18112/88A
Other versions
AU1811288A
(en
Inventor
Anton Neumaier
Uto Plank
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.)
Hilti AG
Original Assignee
Hilti AG
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.)
1987-06-20
Filing date
1988-06-17
Publication date
1990-02-08
1988-06-17
Application filed by Hilti AG
filed
Critical
Hilti AG
1988-12-22
Publication of AU1811288A
publication
Critical
patent/AU1811288A/en
1990-02-08
Application granted
granted
Critical
1990-02-08
Publication of AU593449B2
publication
Critical
patent/AU593449B2/en
2008-06-17
Anticipated expiration
legal-status
Critical
Status
Ceased
legal-status
Critical
Current
Links
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Classifications
B—PERFORMING OPERATIONS; TRANSPORTING
B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
B25D—PERCUSSIVE TOOLS
B25D17/00—Details of, or accessories for, portable power-driven percussive tools
B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
B25D17/084—Rotating chucks or sockets
B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
B—PERFORMING OPERATIONS; TRANSPORTING
B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters therefor
B—PERFORMING OPERATIONS; TRANSPORTING
B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
B25D—PERCUSSIVE TOOLS
B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
B25D2217/003—Details relating to chucks with radially movable locking elements
B25D2217/0034—Details of shank profiles
B—PERFORMING OPERATIONS; TRANSPORTING
B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
B25D—PERCUSSIVE TOOLS
B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
B25D2217/003—Details relating to chucks with radially movable locking elements
B25D2217/0038—Locking members of special shape
B—PERFORMING OPERATIONS; TRANSPORTING
B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
B25D—PERCUSSIVE TOOLS
B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
B25D2217/003—Details relating to chucks with radially movable locking elements
B25D2217/0038—Locking members of special shape
B25D2217/0042—Ball-shaped locking members
B—PERFORMING OPERATIONS; TRANSPORTING
B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
B25D—PERCUSSIVE TOOLS
B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
B25D2217/0065—Use of dust covers
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T408/00—Cutting by use of rotating axially moving tool
Y10T408/16—Cutting by use of rotating axially moving tool with control means energized in response to activator stimulated by condition sensor
Y10T408/165—Cutting by use of rotating axially moving tool with control means energized in response to activator stimulated by condition sensor to control Tool rotation
Abstract
A hand-held device with a holder for a working tool has a sensing mechanism for automatically initiating different operating modes. Different configurations of working tools inserted into the holder can be sensed by sensing elements in the form of balls. The balls cooperate with pivotal levers and a sensor for producing switching signals for initiating a switching operation.
Description
r COMMONWEALTH OF AUSTRALIA FORM PATENTS ACT 1952 COMPLETE SPECIFICATION FOR OFFICE USE: Class Int.Class Application Number: Lodged: Complete Specification Lodged: Accepted: Published: 3449 Related Art: ‘N ame of Applicant: HILTI AKTIENGESELLSCHAFT f Address of Applicant: Schaan, Liechtenstein 4, Actual Inventor: Anton Neumaier and Uto Plank S’Address for Service: SHELSTON WATERS, 55 Clarence Street, Sydney .’*,,Complete Specification for the Invention entitled: 0 «HANDHELD APPLIANCE» 4 The following statement is a full description of this invention, Sincluding the best method of performing it known to us:r0 4 it l 1 tI’
J
r -2- Handheld Applianc.
The invention refers to a handheld appliance with a tool holding fixture for tools and a scanning device for tracing the contour of the tools, which cooperates with an appliancespecific sensor in order to introduce a switching process, whereby the scanning device is provided with at least one control element which, in an essentially transverse direction to the tool axis, engages in a guiding bore hole of the tool holding fixture and is also provided with a tracing mechanism for the control element.
eoee lI From the German patent application 36 42 976, an electrically *4*444 operated handheld appliance is known which automatically adjusts various operating modes. For this, the appliance is equipped with a scanning device for introducing a switching process whereby the contour of the inserting shaft of the tool which is mounted in the tool holding fixture of the S appliance is traced and evaluated for the switching process.
The scanning device consists of a slide which is adjustable along the axis of the tool holding fixture, and of one or several control elements on which the slide-depending on the tool specific contour-is axially supported.
It is the objective of the present invention to design and construct a handheld appliance provided with a scanning device for the tool related introduction of switching processes which permits a short overall length of the handheld appliance and is capable of tracing even less distinct contours.
According to the invention, this objective is achieved in that the tracing mechanism is executed as a two-armed swivelling lever with a swivelling axis in a direction which is transverse to the direction of the tool axis whereby, with the one lever arm supported on the control element, -3the other lever arm which faces away from the control element’, cooperates with the sensor and, with the control element engaged in the guiding bore hole, has a smaller radial distance to the sensor than with the control element being disengaged from the guiding bore hole.
The lever arm facing away from the control element executes a swivelling movement in the direct.on opposite to that of the lever arm which cooperates with the control element.
An appropriate selection of the length of the lever arm .l permits the achievement of a translation of the radial engaging and/or disengaging path of the control element with regard to the lever arm facing away from it. Thus, S the contours to be traced may be executed with a minimum *04044 S of shaping so that te solidity of the inserting shaft is not impaired.
*tSt S 4 Depending on the execution of the tool contour to be traced, several control elements and an equal number of Sswivelling levers may be swivelled into the identifying reach of the sensor together with the lever arms which face away from the control elements. If the handheld appliance is switched on, the swivelling levers, together with the tool holding fixture, rotate around the axis of the tool holding fixture. Analogous to their swivelling position, the lever arms which face away from the control elements, trigger, for example inductively, switching signals in the sensor. These switching signals may be utilized for executing the switching processes. In this manner, the tracing of the contour of the inserted tool permits, for example, the adjustment of a specific speed in conjunction with a specific impact value effecting the tool.
Preferably, several swivelling levers are provideA which are staggered in the direction of the periphery of the -4tool holding fixture.: The swivelling.levers and the control elements allocated to them are, for example, «offset at a 900 angle’which means that there are two pairs. 6f diametrically opposed swivelling levers and -control elements which, in the same axial position, are offset to the tool holding fixture in a crosswise manner.
Combined with a short overall length of the handheld appliance, this arrangement enables the introduction of several switching processes.
10 Advantageously, spring elements act upon the swivelling levers, whereby these levers, together with the one lever arm, are driven against the control elements. These spring elements or mechanisms may, for example, be pressure springs o which have an effect on each of the swivelling levers. With o ~15 contours available on the inserting shaft of the tool which S are allocated to the appropriate control element, these 0 spring mechanisms move the control elements against the tool once the inserting shaft is locked in the tool holding fixture. Thus, the lever arm of the appropriate swivelling i 20 lever, which is at a distance from the control element, adjusts to a contour-related swivelling position.
r« t n er For the generation of differently long switching signals and thus for the achievement of a differentiation of the switching processes, the swivelling levers, on their lever arms which face away from the control elements, have different- Ssized active areas which enter into the identifying reach of the sensor.
If there are two pairs of swivelling levers, it is expedient for the one pair to be equipped with the lever arms with larger active areas.
o ‘^~aY iB -i Llll~ll^r-~mr According to yet another embodiment of the invention, the lever arm of the swivelling levers which faces away from the control elements, is executed as a magnet, whereby it is possible to either equip only the lever arm with magnetic, preferably permanently magnetic properties or to design the entire swivelling .ever as a magnet. For magnetic lever arms a Hall element is suitable as a sensor which has the advantage of favourable production costs. Depending on the positions of the swivelling levers, the Hall element recognizes a magnetic field.
o *o 0 J a a 600.6 a a 6 2 *9 a *s2 *e o so 25 a Preferably, the swivelling levers are guided within an actuating sleeve which is slewable, to a limited extent, vis-a-vis the tool holding fixture. It is expedient for the actuating sleeve to cooperate with the locking mechanisms which hold the tools in the tool holding fixture so that by slewing the actuating sleeve into a defined position, the swivelling levers obtain a function-effective position vis-a-vis the control elements and the locking mechanisms adjust to their locking position. Thus, a defined positionspecific interdependence of the holding fixtures of the tools is achieved, for supporting the swivelling levers on the control elements. Apart from a simple handling, this has advantages in reference to the control of the switching processes, especially in connection with lever arms with differently-sized active areas.
Preferably, the control elements are executed as spheres, the geometrical form of which has advantages of assembly and function.
A further proposal of the invention calls for the inserting shaft to be provided with at least one groove for the control elements of the scanning device. These grooves, preferably longitudinal grooves, form the contour to be traced. The ii C: j -6depth of these longitudinal grooves may be kept to a minimum since the different lengths of the lever arms of the swivelling levers guarantee the previously mentioned adequate translation, i.e. an extension of the radial engaging and/or disengaging paths of the control elements. If the inserting shaft is provided with more than one groove, these longitudinal grooves are distributed over the entire area of the inserting shaft, whereby the possibility is given to place the longitudinal grooves in an equal or different angular distance. Different angular distances may be utilized as advantageously influencing Sfactors in the generation of switching signals.
ro An appropriate length of the longitudinal grooves or the Ssuccessive arrangement of the longitudinal grooves may make eo ~sr 5 it possible for the tool to be used with handheld appliances of different design and construction. These differently designed handheld appliances vary, for example, in their switching function or their performance and efficiency and may also be characterized by scanning devices of various @0 20 dimensions. This will guarantee that a specific tool may «o be used in appropriately suitable handheld appliances only and may thus control different modes of operation. If such a tool is used in an inappropriate handheld appliance, switching signals are not generated.
0-25 In the following, the invention is described in greater detail by means of a drawing which depicts a practical example. Thus, Fig. 1 shows in the longitudinal section the front part of a handheld appliance with a scanning device and the tool placed in position; -t I -7- Fig. 2 shows a cross-section through the arrangement according to Fig. 1, and along the plane of section II-II; Fig. 3 shows a cross-section through the arrangement according to Fig. 1, and along the plane of section III-III; Fig. 4 shows a foreshortened drawing of the tool; Fig. 5 shows a section V-V through the tool ~according to Fig. 4, enlarged; 0 Figs. 6 to 8 shows sections analogous to Fig. referring to further modes of execution.
The handheld appliance, the front part of which is shown in the drawing, is a drilling hammer which is capable of transmitting a rotational movement, as well as impacts, to the clamped tol. The impact energy transmitted to the tools is passed on by these to the material to be worked, for which a limited axial movability of the tools in the drilling hammer is necessary.
The drilling hammer according to Figs. 1 to 3 is fitted with an essentially sleeve-like tool holding fixture 1 which incorporates and on the same axis continues into a guide cylinder 2. The guide cylinder 2 is provided with a bearing bore 2a into which enters a guide bore la which has a smaller diameter and protrudes through the tool holding fixture 1. In the bearing bore 2a, a snap die 3 and a i percussion piston 4, impacting on it and faintly recognizable, of a known striking tool are movably arranged. The snap die 3 transmits the impacts which it receives from the percussion piston 4 to a tool 5 which, with a cylindrical inserting shaft 5a, is inserted in the guide bore la and with its free end reaches into the effective area of the snap die 3.
For the rotational drive of the tool holding fixture 1, the guide cylinder 2 is equipped with a torsion resistent toothed wheel 6 which cogs with another toothed wheel 7 of a countershaft 8. This countershaft 8 is also equipped with a bevel wheel 9 which is gearing with a driving bevel wheel 11, whereby the latter is driven via a shaft 12 and a toothed wheel 13 which cogs with a partly shown pinion gear 14.
For the holding device with a limited movability and the rotational drive of the tool 5, the inserting shaft 5a is provided with two diametrically opposed driving grooves o 5b, 5c. These are in contact with spherical locking 0 15 mechanisms 15,16 which are radially movable within the tool holding fixture 1 and are brought into the contact position shown, by an actuating sleeve 17. For this purpose, the actuating sleeve 17 is provided with an inner contour 0 4 17a which is generally known, and which changes in the direction of the periphery on which the locking mechanisms 16,17 are radially supported. A limited twisting of the actuating sleeve 17 vis-a-vis the tool holding fixture 1 leads to the engaging or disengaging of the locking mechanisms 15,16. The twisting of the actuating sleeve 17 is effected by means of an actuating collar 18, firmly attached to it. A protective ring 19 which is, preferably, made of an elastic material and is firmly fixed to the front of the tool holding fixture 1 prevents drillings and similar waste from entering the interior of the appliance.
As shown in Fig. 2, the tool holding fixture 1 is also provided with spherl
