EP0071821A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A tool shaft for a tool of the percussive and rotative type
Assignee: DUROFAC ApS
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Filing: 1982-07-20
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Granted: —
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Expires: 2002-07-20
Abstract
Abstract A tool shaft, especially for drills of the percussive type, such as hammer drills, is adapted to be mounted in a tool holder (15) having fixed driving elements (17), and the shaft (11) is therefore provided with guiding recesses (12), driving recesses (13), and interconnecting transition recesses (14), which recesses in combination with the driving elements (17) form a type of bajonet joint. In order to improve the universal applicability of the tool shaft also in connection with tool holders (19) of the type having radially movable driving elements (20), the driving recesses (13) are formed with a radial depth exceeding that of the guiding recesses (12), and each of the guiding recesses has a cross-sectional shape so as to define a rib or edge (18) between each associated pair of guiding and driving recesses so as to prevent spherical or cylinder shaped driving elements (20) of the radially movable type from being moved unintentionally from the driving recess into the associated guiding recess.
Inventors
- 👤 Bjarne Nielsen Mogens
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 15:24
CPC Classifications
B; B23; B23B; B23B51/00; B25; B25D; B25D17/00; B25D17/08; B25D17/084; B25D17/088; B25D17/02; B25D2217/00; B25D2217/003; B25D2217/0034; B25D2217/0038; B25D2217/0042; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17042; Y10T279/17085; Y10T279/17863; Y10T403/00; Y10T403/70; Y10T403/7005; Y10T403/7007; Y10T408/00; Y10T408/89; Y10T408/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
195 words
A tool shaft for a tool (10) of the percussive and rotative type and having a substantially cylindrical end portion (11) adapted to be releasably received within a cylindrical bore (16) of a tool holder (15,19) having at least one driving member (17,20) extending radially into the bore, the cylindrical end portion of the shaft comprising at least one pair of axially coextending, peripherally off-set first and second recesses (12,13) interconnected by a peripherally extending third recess (14), the first recess (12) extending from the free end of the cylindrical end portion and the second recess (13) having closed axially opposite ends and driving surface for drivingly engaging with a driving element of the tool, each of said first, second, and third recesses being adapted to slidably receive the driving member (17,20) of the tool holder therein when the tool shaft is inserted in the holder, characterized in that the surface part defining the first recess (12) is shaped so as to define between the pair of first and second recesses (12,13) a separating shaft portion (18) having a radially outward surface part substantially coinciding with the cylindrical outer surface of the cylindrical end portion.
Claim 2
Dependent Claim
195 words
A tool shaft for a tool (10) of the percussive and rotative type and having a substantially cylindrical end portion (11) adapted to be releasably received within a cylindrical bore (16) of a tool holder (15,19) having at least one driving member (17,20) extending radially into the bore, the cylindrical end portion of the shaft comprising at least one pair of axially coextending, peripherally off-set first and second recesses (12,13) interconnected by a peripherally extending third recess (14), the first recess (12) extending from the free end of the cylindrical end portion and the second recess (13) having closed axially opposite ends and driving surface for drivingly engaging with a driving element of the tool, each of said first, second, and third recesses being adapted to slidably receive the driving member (17,20) of the tool holder therein when the tool shaft is inserted in the holder, characterized in that the surface part defining the first recess (12) is shaped so as to define between the pair of first and second recesses (12,13) a separating shaft portion (18) having a radially outward surface part substantially coinciding with the cylindrical outer surface of the cylindrical end portion.
Claim 3
Dependent Claim
53 words
A tool shaft according to claim 1, characterized in that the surface part defining the first recess (12) has a cross-sectional profile defining an obtuse angle, and that the side of the angle adjacent to the second recess (13) of the pair of recesses is shorter than the other side of the angle.
Claim 4
Dependent Claim
27 words
A tool shaft according to claim 1 or 2, characterized in that the radial depth of the second recess (13) exceeds that of the first recess (12).
Claim 5
Dependent Claim
23 words
A tool shaft according to claim 3, characterized in that the bottom of the second recess (13) has a concavely curved cross-sectional shape.
Claim 6
Dependent Claim
47 words
A tool shaft according to any of the claims 1-4, characterized in that the radially outward surface part of the separating shaft portion is a peripherally narrow surface part (18) extending along a generatrix of the cylindrical outer surface of the cylindrical portion of the tool shaft.
Claim 7
Dependent Claim
45 words
A tool shaft according to any of the claims 1-5, characterized in that the cylindrical end portion (11) of the shaft comprises two identical pairs of first and second recesses (12,13) arranged symmetrically about the longitudinal axis of the end portion of the tool shaft.
Claim 8
Dependent Claim
55 words
A tool shaft according to any of the claims 1-6, characterized in that the peripherally extending third recess (14) is connected to the second recess (13) at a position spaced from the ends thereof, and that the first recess (12) extends axially beyond the position at which it is connected to the first recess (12).
Claim 9
Dependent Claim
46 words
A tool shaft according to any of the claims 7, characterized in that the extension of the first recess is in the form of a channel (25) adapted to receive a spline-like driving member (26) extending into the cylindrical bore (16) of the tool holder (19).
References Cited (Backward Citations)
No citation records indexed.
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