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EP0062195B1 - Outil à moteur pour serrer les écrous - Google Patents

Outil à moteur pour serrer les écrous Download PDF

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Publication number
EP0062195B1
EP0062195B1 EP82102246A EP82102246A EP0062195B1 EP 0062195 B1 EP0062195 B1 EP 0062195B1 EP 82102246 A EP82102246 A EP 82102246A EP 82102246 A EP82102246 A EP 82102246A EP 0062195 B1 EP0062195 B1 EP 0062195B1
Authority
EP
European Patent Office
Prior art keywords
ring
support element
wrench head
head casing
piston
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.)
Expired
Application number
EP82102246A
Other languages
German (de)
English (en)
Other versions
EP0062195A3 (en
EP0062195A2 (fr
Inventor
Oswald Dubiel
Karl-Richard Hirtsiefer
Paul-Heinz Wagner
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to AT82102246T priority Critical patent/ATE14198T1/de
Publication of EP0062195A2 publication Critical patent/EP0062195A2/fr
Publication of EP0062195A3 publication Critical patent/EP0062195A3/de
Application granted granted Critical
Publication of EP0062195B1 publication Critical patent/EP0062195B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston

Definitions

  • the pressure medium cylinder is located inside the key head housing.
  • the piston which is linearly movable in the pressure medium cylinder, is supported by a piston rod articulated at its two ends on a support element which is mounted coaxially to the ring axis on the key head.
  • the support element is placed against a stationary abutment and the piston in the pressure medium cylinder is extended.
  • the key head housing is pivoted about the ring axis relative to the stationary support element.
  • a key nut stored in the interior of the ring is carried by a ratchet, so that a screw head inserted into the key nut is rotated.
  • the key head housing is pivoted in the opposite direction, with the key nut not being carried along by the ratchet.
  • the invention has for its object to provide a power wrench of the type mentioned, in which a storage of the support element on the key head housing is not required and which manages with a relatively lightweight and small-volume support element.
  • the guideway for the support element is rectilinear, it should run so that the piston-cylinder unit is approximately perpendicular in the middle stroke position to the line that passes through the center of the ring and through the piston of the piston-cylinder unit.
  • the torque acting on the screw head depends on the distance that the fixed abutment has from the axis of the key head housing, or on the length of the moment arm with which the abutment provides the support.
  • a similar dependency on the length of the support torque arm arises when the torque is determined by strain measurements on the key head housing.
  • the support element here consists of an arc segment that can be extended by the piston-cylinder unit from the key head housing and that moves on a circular arc around the ring axis.
  • the key head housing is rather relative to the stationary, supported support element around and around the ring axis pivoted here. This means that the dependence of the tightening torque on the pressure in the cylinder remains largely linear during a piston stroke. It is therefore possible to switch off the screwing device when a certain pressure is reached in the pressure line leading to the cylinder. This ensures that the tightening torque corresponding to this pressure is then reached.
  • This linear pressure dependency is generally not present in the known power screwdrivers because the angle at which the piston-cylinder unit engages the key head housing changes greatly during a stroke.
  • the linear movement of the piston in the cylinder is thus converted into an arc-shaped movement of the support part, the support part simultaneously forming the cylinder.
  • the support part can also be designed as a piston, while the cylinder is mounted on the key head housing and adjusts itself freely to the respective positions of the piston or support part.
  • the fact that either the cylinder or the piston is made in one piece with the support element or is even formed in the interior of the support element reduces the design and the weight of the power screwdriver
  • Such ratchets are part of the state of the art - also in connection with power screwdrivers.
  • Such a power wrench without a ratchet is even lighter and more space-saving than a device with a ratchet.
  • the power wrench has a key head housing 10 in which a ring 11 is rotatably mounted.
  • the ring 11 is provided with an internal toothing 12 into which a key nut provided with a corresponding external toothing can be inserted axially, so that the key nut is connected to the ring 11 in a rotationally fixed manner.
  • the ring 11 is anchored in the key head housing 10, from which it projects slightly on both sides, with a snap ring 13 (FIG. 2), so that it is captively but freely rotatably supported by the key head housing 10 on the peripheral wall of the ring 11 there is a toothing 14 which cooperates with a ratchet 15.
  • the ratchet 15 consists of a toothed segment 16, which is accommodated in a cavity 17 of the key head housing 10 and engages with its toothing in the external toothing 14 of the ring 11.
  • the toothed segment 16 has on its rear side along a sloping shoulder a dome-shaped recess into which a ball 18 is inserted.
  • the ball also projects into a dome-shaped recess on the end face of a pressure piece 19.
  • the rear end of the pressure piece 19 is supported by a further ball 20 on a wall of the key head housing 10. It runs through a bore 21 which is directed so that the extension of its axis is almost tangential to the ring 11.
  • the toothed segment 16 can be released from the engagement of the external toothing 14.
  • the pressure piece 19 acts with the joints formed by the balls 18 and 20 as a toggle mechanism by which the toothed segment 16 is pressed into the toothing 14. In this way, the ring 11 is carried by the ratchet 15 only when the key head housing 10 is rotated clockwise.
  • the key head housing 10 also has a circular segment-shaped guideway 22 which is curved around the axis of the ring 11.
  • This guideway 22 consists of a cavity, the outer circumferential wall 23 and the inner circumferential wall 24 of which run in a circular arc, while the side walls 25, 26 are flat.
  • the guideway 22 has a rectangular or square cross section.
  • the support element 27 is located in the arcuate guideway 22, which is also curved in the shape of an arc of a circle according to FIG. 1 and has a cross section adapted to the guideway 22.
  • the support element 27 can be displaced along the circumferentially completely closed guideway 22, so that its outer end 27 'can be moved out of the guideway 22 and thus out of the key head housing 10.
  • the outer end 27 'of the support member 27 is against a fixed support, for. B. against a wall or an adjacent screw head, set to derive the reaction force generated during screwing
  • the cylinder space 28 Inside the support element 27 is the cylinder space 28, in which the piston 29 is linearly displaceable.
  • the center line of the longitudinal axis of the cylinder chamber 28 is approximately perpendicular to a radius of the ring 11, so that a favorable external use of the pressure force acting between the piston 29 and the support element 27 is achieved to form a torque for the key head housing 10.
  • the piston 29 has at its rear end a tubular extension 30, which leads sealingly through the end wall 31 of the cylinder chamber 28.
  • the tubular extension 30 has a smaller diameter than the front piston surface 32, so that the cylinder chamber 28 is divided into two parts by the piston 29. Each of these parts is connected via a hydraulic line to a hydraulic switching valve (not shown).
  • the hydraulic lines lead through the support element 27.
  • a hydraulic line 33 is visible in FIG.
  • a piston rod 34 runs through the tubular extension 30 at a radial distance, one end of which is connected to the piston 29 via a ball joint 35, while the other end is supported on the key head housing 10 via a joint 36.
  • the piston rod 34 runs approximately coaxially with the axis of the cylinder space 28.
  • the key head housing 10 By alternately pressurizing the part of the cylinder space 28 which lies in front of the piston 29 and the part which is located behind the piston 29, the key head housing 10 is pivoted about the axis of the ring 11 when the support element 27 is fixed . If the end 27 'of the support element 27 is placed against a stationary abutment, a screw head coupled in a rotationally fixed manner to the ring 11 can be tightened by alternately moving the key head housing 10 back and forth, the screw head being carried by the ratchet 15 only when the ratchet 15 is extended Piston 29 (to the right according to FIG. 1) takes place, while on the return stroke of the piston 29 (from right to left according to FIG. 1) the ratchet 15 slides empty on the external toothing of the ring 11.
  • an open or partially closed guideway can also be used. It is only important that the support element 28 is guided exactly along an arcuate guideway whose center lies at least approximately on the axis of the ring 11.
  • a housing 40 consisting of the extension 43 and interchangeable ring inserts 41 is provided.
  • the ring insert 41 is rigid overall and has a star-shaped inner contour 42 which forms the key nut.
  • the inner contour 42 is designed in a known manner so that a hexagon screw head, which fits into the key socket, fits into the key socket after a rotation by 30.
  • the device can therefore only be moved in its entirety on the screw head after an angle of rotation of 30 °. In order to keep the change in torque during the rotary movement as small as possible, the angle of rotation resulting from the stroke of the piston-cylinder unit is limited.
  • the ring insert 41 is detachably and pivotably connected to the attachment 43.
  • the ring insert 41 has, on part of its circumference, an arc-shaped guide rail 44 which, as shown in FIG. 4, is T-shaped in cross section.
  • the T-shaped guide rail 44 is inserted into a T-shaped groove 45 of the extension 43.
  • the shoulder 43 on the guide rail 44 can be pivoted around the axis of the ring insert 41.
  • the coupling of the extension 43 to the ring insert 41 is carried out by bolts 46 which pass through bores 47, 48 of the guide rail 44 and of the extension 43.
  • the holes 47 and 48 of the parts 41 and 43 are aligned with each other in certain positions of these parts, so that a bolt 46 can be inserted.
  • a pair of holes consisting of the bores 47 and 48 must be formed at least every 15 angular degrees of displacement of the extension 43 relative to the ring, through which a bolt 46 is inserted that can.
  • an adjustable extension can be attached to the outer end 27 'of the support element 27, which extension consists, for example, of a strong screw. After the support element 27 has been moved out, the support element can be fully or partially withdrawn again. Then the adjustable extension is attached to the end 27 'of the support element 27 and the support element is extended again.
  • an interchangeable intermediate piece can also be temporarily attached to the end 27 ′ of the support element 27. This results in a stroke saving with simple means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Transmission Devices (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Claims (5)

1. Clé de puissance se composant de:
1.1 un boîtier (10, 40) de tête de clé, comportant une bague (11) pour la réception d'une noix de clé,
1.2 un élément de support (27) monté mobile sur le boîtier (10, 40) de tête de clé, pour venir s'adapter contre un appui fixe, et
1.3 une unité à cylindre-piston (28, 29) agissant entre le boîtier (10, 40) de tête de clé et l'élément de support (27) et déplaçant le boîtier de tête de clé par rapport à l'élément de support,

caractérisée par le fait que:
1.4 le boîtier (10, 40) de tête de clé présente une glissière de guidage (22) pour l'élément de support (27),
1.5 l'élément de support (27) est monté coulissant dans la glissière de guidage (22), et
1.6 l'élément de support (27) fait librement saillie à partir de l'une des extrémités de la glissière de guidage (22).
2. Clé de puissance selon la revendication 1, caractérisée par le fait que:
2.1 la glissière de guidage (22) a une allure en forme d'arc de cercle autour de l'axe de la bague (11).
3. Clé de puissance selon la revendication 1 ou 2, caractérisée par le fait que:
3.1 le cylindre (28) de l'unité à piston-cylindre (28, 29) est constitué par une cavité cylindrique à l'intérieur de l'élément de support (27), et
3.2 le piston (29) est accouplé à articulation avec l'une des extrémités d'une tige (34) de piston, dont l'autre extrémité est en appui à articulation contre le boîtier (10) de tête de clé.
4. Clé de puissance selon l'une des revendications 1 à 3, caractérisée par le fait que:
4.1 la bague (11) est montée dans un coussinet de pivotement du boîtier (10) de tête de clé, et
4.2 entre le boîtier (10) de tête de clé et la bague (11) agit un cliquet (15) entraînant la bague dans un sens de rotation seulement du boîtier (10) de tête de clé.
5 Clé de puissance selon l'une des revendications 1 à 3, caractérisée par le fait:
5.1 le boîtier (40) de tête de clé est constitué par la bague (41) et une partie saillante (43) pouvant être assemblée rigidement à la bague et présentant la glissière de guidage (22), et
5.2 la partie saillante (43) est apte à colisser sur un rail (44) de la bague (41) s'étendant co- axialement à l'axe de la bague, et à être bloquée dans différentes positions.
EP82102246A 1981-04-03 1982-03-19 Outil à moteur pour serrer les écrous Expired EP0062195B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82102246T ATE14198T1 (de) 1981-04-03 1982-03-19 Kraftschrauber.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3113482 1981-04-03
DE19813113482 DE3113482A1 (de) 1981-04-03 1981-04-03 "kraftschrauber"

Publications (3)

Publication Number Publication Date
EP0062195A2 EP0062195A2 (fr) 1982-10-13
EP0062195A3 EP0062195A3 (en) 1983-11-30
EP0062195B1 true EP0062195B1 (fr) 1985-07-10

Family

ID=6129254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102246A Expired EP0062195B1 (fr) 1981-04-03 1982-03-19 Outil à moteur pour serrer les écrous

Country Status (3)

Country Link
EP (1) EP0062195B1 (fr)
AT (1) ATE14198T1 (fr)
DE (2) DE3113482A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3413202A1 (de) * 1984-04-07 1985-10-17 Wagner, Paul-Heinz, 5203 Much Kraftschrauber
GB8525983D0 (en) * 1985-10-22 1985-11-27 Hydra Tight Ltd Power tools
DE3719893A1 (de) * 1987-06-13 1988-12-29 Wagner Paul Heinz Hydraulischer kraftschrauber
DE20301758U1 (de) * 2003-02-05 2004-06-17 Wagner, Paul-Heinz Kraftschrauber

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD62789A (fr) *
DE2529818C3 (de) * 1975-07-04 1977-12-22 Wagner Paul Heinz Motorgetriebener freilaufschluessel
DE3008332C2 (de) * 1980-03-05 1982-12-16 Wagner, Paul-Heinz, 5203 Much Kraftbetriebenes Drehwerkzeug
DE3008381A1 (de) * 1980-03-05 1981-09-10 Wagner, Paul-Heinz, 5203 Much Drehwerkzeug

Also Published As

Publication number Publication date
DE3113482A1 (de) 1982-10-28
DE3264627D1 (en) 1985-08-14
ATE14198T1 (de) 1985-07-15
EP0062195A3 (en) 1983-11-30
EP0062195A2 (fr) 1982-10-13

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