EP0035164A1 - Clé de puissance - Google Patents

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Publication number
EP0035164A1
EP0035164A1 EP81101131A EP81101131A EP0035164A1 EP 0035164 A1 EP0035164 A1 EP 0035164A1 EP 81101131 A EP81101131 A EP 81101131A EP 81101131 A EP81101131 A EP 81101131A EP 0035164 A1 EP0035164 A1 EP 0035164A1
Authority
EP
European Patent Office
Prior art keywords
piston
key head
ring
cylinder
support element
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
EP81101131A
Other languages
German (de)
English (en)
Other versions
EP0035164B1 (fr
Inventor
Karl-Richard Hirtsiefer
Johann Müller
Kurt Walterscheid
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 AT81101131T priority Critical patent/ATE11242T1/de
Publication of EP0035164A1 publication Critical patent/EP0035164A1/fr
Application granted granted Critical
Publication of EP0035164B1 publication Critical patent/EP0035164B1/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 invention relates to a power wrench with a key head in which a ring which can be connected to a screw head is mounted, a driving device which only takes the ring in one direction of rotation of the key head, and a piston-cylinder unit which has one end against it an approach of the key head and with its other end presses against a support element which is pivotally mounted on the key head.
  • a known power screwdriver of this type (DE-OS 27 46 632) has a piston-cylinder unit, the piston of which is approximately at right angles to the neck of the key head and the cylinder of which projects far from the key head.
  • the rear end of the cylinder lies against the support element, which in turn is at a fixed point, z.3. an adjacent screw.
  • the cylinder forms a very acute angle with the support element.
  • side plates which are articulated on the one hand on the cylinder and on the other hand on the screw head.
  • the support element and the side plates in the known power screwdriver are considerably longer than the attachment of the key head.
  • the power wrench thus has relatively large dimensions and a high weight.
  • the usability of a power wrench essentially depends on the fact that it is small enough to be used in places where a large device cannot be attached and that it is light in weight so that it can easily be attached to a screw or to be able to be implemented.
  • the invention has for its object to provide a power wrench of the type mentioned, which has small dimensions and can be carried out lightweight compared to the known devices.
  • the effective lengths of the support element on the one hand and the attachment of the key head on the other hand, each based on the center of the key head differ from one another by less than a factor of 1.5 and in particular are essentially of the same size.
  • the length of the support element and the attachment of the key head need not be exactly the same. Rather, it is sufficient if both lengths are of the same order of magnitude, which can be limited approximately by the fact that the two lengths differ by less than the factor 1.5. However, the factor by which the two lengths differ is preferably less than 1.2.
  • a significant reduction in size and a simplification of manufacture results in an advantageous development of the invention in that the cylinder of the piston-cylinder unit is rigidly connected to the neck of the key and that the piston rod articulated on the support element also articulated on the back of the piston attacks. No separate piston-cylinder unit is required, but the cylinder is, so to speak, integrated into the attachment of the key head. The piston is thus moved directly out of the neck of the key head and pressed against the support element.
  • the piston-side end of the piston rod must be articulated to the piston, so that the piston rod has a first joint with the support element and a second Element is connected to the piston, and can freely adjust its angle according to the respective stroke position of the piston.
  • the piston rod is surrounded for a substantial part of its length by a jacket which is firmly connected to the piston and which leads out of the cylinder through a sealed opening.
  • the piston rod has sufficient freedom of movement within the jacket in order to be able to adjust to the different positions of the support element and of the key head relative to one another.
  • the piston itself has only one. relatively short axial length and on it, still inside the cylinder, engages the pivotable piston rod. This leads to a short overall length of the piston-cylinder unit because the required articulation point is located inside the cylinder directly on the piston or at the level of the piston head.
  • a relatively large piston force is required during the working movement of the piston, that is to say when the shoulder of the key head and the support element are pressed apart.
  • the force required to return the piston is much smaller.
  • the two fluid connections can be connected alternately to a pressure line and a return line, then the rear cylinder chamber has a relatively small volume due to the jacket surrounding the piston rod and the rear piston area is also quite small. The piston can therefore be brought back into the retracted position with a small amount of fluid, so that the return stroke is carried out at a higher speed and with a smaller amount of fluid than the working stroke.
  • the piston rod has at least one end a dome-shaped recess in which a ball is seated, which is supported in a corresponding recess in the support part or the piston.
  • a gear is mounted on the key head, which meshes with a toothing of the ring and can be rotated in one direction of rotation independently of an actuation of the piston-cylinder unit.
  • the power wrench shown has a key head 10 which has a substantially circular recess 11 in which a ring 12 is rotatably mounted.
  • the ring 12 is cylindrical on its outer surface and there it has an outer toothing 13 in the central region of its length.
  • the ring 12 has cylindrical bearing surfaces 14 and 15 on both sides of the outer toothing 13.
  • the inside of the ring 12 is designed as a hexagonal channel 16 or as another non-circular inner profile. In the hexagon channel 16, for example, a key socket can be inserted, which can be connected in a rotationally fixed manner to the ring 12 in this way.
  • the key head 10 which surrounds the ring 12 over a considerable part of the circumference, has a circumferential inner groove 17 which offers space for receiving the external toothing 13 of the ring 12.
  • the located on both sides of the annular groove 17 Surfaces 11 run on the bearing surfaces 14 and 15 of the ring 12, so that the key head 10 and the ring 12 are centered relative to one another.
  • the key head 10 has a radially projecting shoulder 18, which contains the cylinder bore 19 of the piston-cylinder unit 20 and a ratchet 21.
  • the key head 10 is, with the exception of the extension 18, enclosed by the support ring 22 of the support element 23.
  • the support ring 22 is U-shaped in cross section, the end faces of its legs sliding on the bearing surfaces 14, 15 of the ring 12.
  • the support ring 22 surrounds the key head 10, but has an opening for the passage of the extension 18.
  • the support element 23 consists of a plate which extends approximately tangentially to the key head 10 or to the ring 12 and which forms a U-shaped structure with the side plates 24. As FIG. 1 shows, the projection 18 projects between the side plates 24 of the support element 23.
  • the piston 25 is displaceable in the cylinder bore 19 of the extension 18.
  • the piston is sealed with seals 26 against the cylinder wall and has a dome-shaped recess 27 in its rear, into which a suitable steel ball 28 is inserted.
  • the piston rod 29 presses against the steel ball 28 and also has a dome-shaped recess 30 at its front end. In this way, the steel ball 28, together with the dome-shaped recesses 27 and 30, forms a joint to be stressed.
  • a similar joint is located at the other end of the piston rod 29.
  • This joint consists of a ball 31 which is in a dome-shaped shape Take 32 of the end of the piston rod 29 and a spherical recess 33 of the support member 23 is seated.
  • the piston rod 29 is surrounded by a cylindrical jacket 34 which is firmly connected to the piston 25.
  • the end of the cylinder bore 19 is closed by a bush 35 and sealed with seals 36 with respect to the jacket 34.
  • the cylinder of the piston-cylinder unit 20 is designed as a double-acting cylinder and is connected to a first connecting line 37 and a second connecting line 38.
  • the first connection line 37 When the first connection line 37 is pressurized, the second connection line 38 serves as a return line and vice versa.
  • the first connection line 37 leads into the rear end of the cylinder bore 19 and the second connection line 38 into the front end of the cylinder bore 19.
  • the lines leading to the connections are not shown.
  • the jacket 34 is connected to the support element 23 by a spring (not shown) in order to prevent the projection 18 and the support element from being pivoted apart.
  • FIG. 1 shows, the distances between the balls 28 and 33 from the center of the ring 12 and the key head 10 are approximately the same.
  • the piston 25 is extended (to the left according to FIG. 2).
  • the support member 23 is placed against a fixed abutment (not shown), the lug 18 is rotated clockwise around the center of the ring 12.
  • the point of application of the pressure at the extension 18 lies in the center 40 of the end face of the cylinder bore.
  • the distance of the point 40 from the center of the ring 12 is not significantly greater than the distance of the ball 31 from the center of the ring 12, so that the piston-cylinder unit effectively pushes the support element 23 and the arm 18 apart.
  • the ratchet 21 which takes the ring 12 only in one direction (clockwise) when the key head 10 is pivoted, but allows the key head to freely return in the opposite direction, is also accommodated in the protruding projection 18 of the key head 10 in the exemplary embodiment described .
  • It consists of a toothed segment 41, which is accommodated in a cavity 42 of the key head 10 and engages with its teeth in the external toothing 13 of the ring 12.
  • the toothing segment 41 has on its rear side along a sloping shoulder a dome-shaped recess 43 into which a ball 44 is inserted.
  • the ball also projects into a dome-shaped recess 45 on the end face of a pressure piece 46.
  • the rear end of the pressure piece 46 is also supported on a screw piece 50 by a ball 47, which is seated in two spherical caps 48, 49.
  • the pressure piece 46 is accommodated in a bore 51 of the extension 18. The outer end of this hole is threaded and closed with the screw 50. The inner end of the bore 51 opens into the cavity 42.
  • the bore 51 runs so that the extension of its axis intersects the circle of the external teeth 13 of the ring 12 as a secant. This secant runs somewhat outside the center of the radius perpendicular to it.
  • the toothed segment 41 can be released from the engagement of the external toothing 13.
  • the pressure piece 46 with the joints formed by the balls 44 and 47 acts as a toggle mechanism by which the Ver tooth segment 41 is pressed into the toothing 13. In this way, when the key head 10 is turned clockwise, the ring 12 is carried along by the ratchet 21.
  • a gear 55 is mounted inside the key head, which meshes with the external toothing 13 of the ring 12.
  • the gear 55 is freely rotatable on the key head 10 and is in engagement with a further gear 56, which is also mounted on the key head 10.
  • the second gear 56 has an inner square 57, into which a tool can be inserted in order to manually turn the ring 12. In this way it is possible to tighten screws with a low torque before the actual tightening takes place by the piston-cylinder unit 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Valve Device For Special Equipments (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Braking Systems And Boosters (AREA)
EP81101131A 1980-03-05 1981-02-17 Clé de puissance Expired EP0035164B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101131T ATE11242T1 (de) 1980-03-05 1981-02-17 Kraftschrauber.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3008332A DE3008332C2 (de) 1980-03-05 1980-03-05 Kraftbetriebenes Drehwerkzeug
DE3008332 1980-03-05

Publications (2)

Publication Number Publication Date
EP0035164A1 true EP0035164A1 (fr) 1981-09-09
EP0035164B1 EP0035164B1 (fr) 1985-01-16

Family

ID=6096271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101131A Expired EP0035164B1 (fr) 1980-03-05 1981-02-17 Clé de puissance

Country Status (3)

Country Link
EP (1) EP0035164B1 (fr)
AT (1) ATE11242T1 (fr)
DE (2) DE3008332C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062195A2 (fr) * 1981-04-03 1982-10-13 Paul-Heinz Wagner Outil à moteur pour serrer les écrous
EP0062194A2 (fr) * 1981-04-03 1982-10-13 Paul-Heinz Wagner Outil à moteur pour serrer les écrous
DE3413202A1 (de) * 1984-04-07 1985-10-17 Wagner, Paul-Heinz, 5203 Much Kraftschrauber
GB2167698A (en) * 1984-12-01 1986-06-04 Wagner Paul Heinz Power wrenches
GB2182592A (en) * 1985-10-22 1987-05-20 Hydra Tight Ltd Hydraulic torque wrench

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3811776A1 (de) * 1988-01-23 1989-08-03 Wagner Paul Heinz Hydraulischer kraftschrauber

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD62789A (fr) *
FR2256803A1 (en) * 1974-01-03 1975-08-01 Abdellatif Ala Tool for turning car wheel nuts - has socket spanner in pinned triangle with hydraulic jack as one arm
DE2631852A1 (de) * 1976-07-15 1978-01-19 Dymax Maschinenbau Und Handels Mittels einer antriebsvorrichtung betriebenes werkzeug zum anziehen oder loesen von schrauben
DE2746632A1 (de) * 1976-10-19 1978-04-20 John K Junkers Hydraulischer schraubenschluessel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752810A (en) * 1954-09-21 1956-07-03 Ingersoll Rand Co Power operated ratchet wrench
DE2529818C3 (de) * 1975-07-04 1977-12-22 Wagner Paul Heinz Motorgetriebener freilaufschluessel
CA1060238A (fr) * 1976-11-22 1979-08-14 Glenn F. Depagter Entrainement de cle a rochet mecanique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD62789A (fr) *
FR2256803A1 (en) * 1974-01-03 1975-08-01 Abdellatif Ala Tool for turning car wheel nuts - has socket spanner in pinned triangle with hydraulic jack as one arm
DE2631852A1 (de) * 1976-07-15 1978-01-19 Dymax Maschinenbau Und Handels Mittels einer antriebsvorrichtung betriebenes werkzeug zum anziehen oder loesen von schrauben
DE2746632A1 (de) * 1976-10-19 1978-04-20 John K Junkers Hydraulischer schraubenschluessel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062195A2 (fr) * 1981-04-03 1982-10-13 Paul-Heinz Wagner Outil à moteur pour serrer les écrous
EP0062194A2 (fr) * 1981-04-03 1982-10-13 Paul-Heinz Wagner Outil à moteur pour serrer les écrous
EP0062194A3 (en) * 1981-04-03 1983-11-30 Paul-Heinz Wagner Power-driven screw-driving tool
EP0062195A3 (en) * 1981-04-03 1983-11-30 Paul-Heinz Wagner Power-driven screw-driving tool
DE3413202A1 (de) * 1984-04-07 1985-10-17 Wagner, Paul-Heinz, 5203 Much Kraftschrauber
DE3413202C2 (fr) * 1984-04-07 1988-09-22 Wagner, Paul-Heinz, 5203 Much, De
GB2167698A (en) * 1984-12-01 1986-06-04 Wagner Paul Heinz Power wrenches
GB2182592A (en) * 1985-10-22 1987-05-20 Hydra Tight Ltd Hydraulic torque wrench

Also Published As

Publication number Publication date
ATE11242T1 (de) 1985-02-15
DE3168221D1 (en) 1985-02-28
DE3008332A1 (de) 1981-09-24
DE3008332C2 (de) 1982-12-16
EP0035164B1 (fr) 1985-01-16

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