US3892147A - Apparatus for screwing headless threaded fasteners - Google Patents

Apparatus for screwing headless threaded fasteners Download PDF

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Publication number
US3892147A
US3892147A US411305A US41130573A US3892147A US 3892147 A US3892147 A US 3892147A US 411305 A US411305 A US 411305A US 41130573 A US41130573 A US 41130573A US 3892147 A US3892147 A US 3892147A
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United States
Prior art keywords
eccentric
fastener
threaded
receiver
tensioning
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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 - Lifetime
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US411305A
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English (en)
Inventor
Christian Flaig
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Individual
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Individual
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Filing date
Publication date
Priority claimed from DE19732313609 external-priority patent/DE2313609C3/de
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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
    • B25B13/00—Spanners; Wrenches
    • B25B13/02—Spanners; Wrenches with rigid jaws
    • B25B13/06—Spanners; Wrenches with rigid jaws of socket type
    • 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
    • B25B13/00—Spanners; Wrenches
    • 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/10—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
    • B25B23/103—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means for gripping threaded studs
    • 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
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • 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
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/143—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same for installing wire thread inserts or tubular threaded inserts
    • 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
    • B25F1/00—Combination or multi-purpose hand tools

Definitions

  • a tool for screwing headless threaded fasteners comprises a receiver having a threaded hole for threadingly receiving an inner end of the fastener, an eccentric element rotatable on the receiver to exert a force against the inner end of the fastener in a manner jamming together the threads of the fastener and hole to resist relative rotation between the fastener and receiver, and a handle for manually applying rotation to the eccentric element.
  • the receiver can be rotated, thus r0- tating the fastener.
  • the eccentric element may be arranged to directly contact the fastener. Alternatively, a shiftable element may be interposed therebetween to transmit force from the eccentric element to the fastener.
  • the receiver may be provided with a plurality of holes to accommodate differently sized fasteners,
  • the invention relates to a screwing tool.
  • the screwing tool according to the invention is suitable for inward and outward screwing of threaded pins, i.e., headless fasteners such as staybolts, tap bolts etc. Hitherto it had been customary and necessary to grasp such fastener bolts either in an area of the shaft free of a thread with a gripping tool or pliers and twist it for the purpose of screwing it in or out. Whenever no shaft area free of thread was available, two nuts would be screwed onto one end of the thread to lock them against each other and then turn this arrangement with the help of a wrench placed on one of the nuts.
  • Another object is to create a screwing tool with the help of which it will be possible to screw headless screws in and out without damage to the free threaded end and without additional auxiliary means.
  • a receiver head provided with at least one threaded hole for the free threaded end of a staybolt, headless screw etc.
  • a tensioning eccentric is pivotally connected to the receiver head in an extension of the axis of the threaded hole, with its pivotal axis extending transversely to the hole;
  • the tensioning eccentric includes eccentric means arranged to apply axial force to a threaded fastener which is threadingly received in the hole. In this fashion, the fastener is locked against rotation in the hole.
  • the eccentric means may be arranged to directly contact the fastener to apply this axial force.
  • a shiftable element such as a thust bolt disposed in the hole, may be arranged to be shifted by the eccentric means against the fastener.
  • a hand lever is firmly connected with the tightening eccentric to rotate the latter.
  • the tool thus is screwed onto the free end of the threaded fastener, i.e. into the threaded hole which is adapted to the thread of this fastener.
  • the hand lever together with which the tightening eccentric is likewise swivelled, the receiver head is tightened against the screwed-in end of the threaded fastener so that now, during screwing of the tool around the axis of the tightened fastener, the latter is now positively and untwistably connected with the screwing tool.
  • the shortest distance of the eccentric surface from its swivelling axis is diametrically opposite to the contact point of the hand lever on the tightening eccentric.
  • the distance of the eccentric surface from its swivelling axis will increase uniformly in both peripheral directions from the point of shortest distance, i.e. at the same pitch, in order to achieve equal conditions in both swivelling directions during tightening at the same swivelling angle.
  • the receiver head has several variable threaded holes distributed over its periphery and is superimposed on a cylindrical base.
  • the receiver head includes a cylindrical bore running perpendicularly to the axis of the threaded holes, and is thereby mounted on the base for relative frictional rotation and against relative axial movement.
  • the axis of the base extend parallel to and at a distance from the axis of the eccentric.
  • an extension with a larger diameter, can be disposed on one end of the cylinder base.
  • a spring plate attached to engage one surface of the receiving head, biases another surface of the receiving head against an edge of the extension.
  • the receiver head can have a forked end with a transverse bore receiving a swivelling bolt of the tightening eccentric.
  • This forked end is disposed opposite the only threaded hole.
  • a thrust bolt with a head supported by the edge of the of the threaded hole facing the tightening eccentric and with a V-shaped crossed slit, can be provided. This bolt is disposed with its front surface set in the threaded hole for the purpose of transferring power between the tightening eccentric and an end of the fastener.
  • the knob can be shaped as a cube with various dodecagonal recesses for nuts for any additional screwing tasks that become necessary. Such nuts can be screwed onto the screwed-in threaded screw, such as a stay bolt.
  • FIG. 1 shows one preferred form of screwing tool according to the invention in side view, with the hand lever shown shortened;
  • FIG. 2 shows a partially broken open side view of the cylinder base with the tightening eccentric
  • FIG. 3 shows a sectional cut following line III-III in FIG. 2;
  • FIG. 4 shows a cross-sectional view of the receiver head of the screwing tool from FIG. 1;
  • FIG. 5 shows the knob of the handle, developed as a wrench with several dodecagonal openings
  • FIG. 6 shows in longitudinal section, a second simplified preferred embodiment of the screwing tool according to the invention with the handle lever shown shortened; 1
  • FIG. 7 shows the screwing tool from FIG. 6 in the screwed-in position
  • FIG. 8 shows a.view of the front surface of the pressure bolt with V-shaped crossing grooves.
  • a receiver head 11 which is shown again in cut through its middle plane in FIG. 4, has three threaded holes 12, 12 12 of various thread sizes. These holes are displaced by 120 in relation to each other.
  • the receiver head has, extending perpendicularly to the plane passing through the center lines of the threaded holes, a cylindrical bore 13. The axis of this bore is somewhat offset from the center of the peripheryof the receiver head.
  • This eccentric arrangement of the cylinder bore 13 relative to the receiving head brings'about the fact that the ratio of the depth of the threaded hole to the threaded hole diameter of all threaded holes is about equal.
  • the material of the receiver head is depth-hardened steel.
  • the cylinder bore 13 of the receiver head 11 receives a cylinder base 14, which is drawn in detail in FIG. 2.
  • the cylinder base 14 has at one end an extension 15 with a largendiameter than the bore. This extension is developed as a hexagonal head through which a transverse opening 16 passes.
  • a hand lever 17 is inserted in this transverse opening. As will be explained later in detail; a hand lever enables the tensioning eccentric to be maneuvered to lock the tool to a fastener after the latteris screwed into the receiving head.
  • the handle lever 17 is offset advantageously in such a way that its end lies approximately in the joint plane of the axis of the threaded holes 12 to 12 with the handle knob 18 lying in the hand.
  • the handle knob 18, which is shown in detail in FIG. 5, has the shape of a cube, whereby one surface of the cube has a bore 19 for inserting the end of the hand lever, while dodecagonal holes 20 20 with different wrench widths are worked into the other surfaces of the cube.
  • the receiver head 11 is seated with sliding or frictional fit on the cylinder base 14.
  • the axial length of the cylinder base 14 is essentially equal to the length of the cylinder bore 13 of the receiver head.
  • the receiving head is fixed grippingly rotatably on the cylinder base with the help of a spring plate 22, held by a screw'21.
  • the clamping is so light that the receiver head can easily be turned by hand, in order to be able to turn the required threaded hole into a certain position.
  • FIG. 2 shows that a threaded bore 23 is worked into the front surface of the threaded base 14 which is opposite the extension 15, into which threaded bore the screw 21 is screwed firmly.
  • the cylinder base 14 is discontinued in its surface by an eccentric section, which represents a tensioning eccentric 24.
  • This tensioning eccentric 24 is at a level which, in case of the receiver head being pushed on to the cylinder base 14, lies adjacent the area of the threaded bores 12 to 12
  • the displacement of the tensioning eccentric in relation to the axis of the cylinder base 14 has been chosen in the direction of the bore 16. for the hand lever.
  • a point on the eccentric representing the shortest distance from the axis of the base 14 to the surface of the eccentric, is located diagonally opposite the place of connection of the handle 17 to the base 14 when viewed from above.
  • the displacement is of such a magnitude that a generatrix of the tensioning eccentric will just be tangent (touch) on the generatrix of the cylinder base.
  • the generatrix of the tension eccentric has circular ribs 25, which in cross-section are V-shaped. These ribs, when the eccentric is turned, squeeze into the lenticular end of the fastener to press the threads of the fastener against the threads of the threaded hole to produce a tightened state therebetween to still further prevent rotation of the fastener relative to the threaded hole.
  • step by step course in the use of the screwing tool is as follows: i
  • a staybolt for example, is to be screwed-in, then the threaded hole 12 to 12 which corresponds to the size of thread of the staybolt, is advanced to a position opposite the hand levers by manually twisting the receiver head.
  • the staybolt can then easily be screwed by hand into the threaded hole, until the inner end thereof abutts against the surface of the tensioning eccentric 24 which lies farthest back in relation to the generatrix of the cylinder base.
  • the tensioning eccentric 24 exerts a force on the end surface of the staybolt and begins to jam the thread of the staybolt in the threaded hole of the receiver head.
  • the ribs 25 simultaneously are forced into the len'ticular front surface of the staybolt. After a certain swivelling movement of the hand lever 17, the staybolt is locked absolutely untwistably in the receiver head 11. It can then be screwed in and tightened into a hole provided for it by turning of the entire tool.
  • the handle 17, the base 14, the receiving head 11, and the staybolt can be rotated in unison about the longitudinal axis of the staybolt to install the staybolt into a structure.
  • the hand lever In order to remove the tool it will be sufficient to swivel the hand lever again into the diametrically opposite position relative to the receiving head, as a result of which the tightening of the staybolt threads in the threaded hole is nullified.
  • the screwing tool can then easily be unscrewed from the staybolt which is now tightly installed.
  • the handle knob 18 with dodecagonal recesses increases the versatility of the screwing tool. It is advantageous if the cube 18 is hollow, so that nuts additionally screwed onto a staybolt can be also be seized thereby, and that the staybolt itself projects through the cube.
  • a second, simplified preferred embodiment of the invention shown in FIGS. 6 to 8, has a receiver head 22A, which is screwed onto staybolt 21A.
  • the receiver head 22a includes a cylindrical body with a concentric threaded bore 23A threadingly receiving the staybolt.
  • the receiver head 22A is provided with prongs of a fork 24 at its end opposite the threaded hole 23A.
  • a transverse bore penetrates these prongs of the fork, in which a bore swivelling bolt 25A is inserted.
  • This bolt 25A penetrates one end of a swivellable hand lever 26.
  • the head 26' of the swivelling lever 26 defines a tensioning eccentric symmetrically configured relative to the longitudinal axis of the hand lever 26.
  • the point on the surface of the eccentric 28, which is least distant from the swivelling axis lies on the longitudinal axis of the hand lever 26. In this case too, therefore, the
  • V-shaped grooves 29 are disposed, in the form of a cross. Such grooves are easily pressed against the front end of the staybolt during tightening of the thrust bolt against'the end of the staybolt through the urging of the tensioning eccentric 26'. The grooves thus also contribute to the further twistproof tightening.
  • FIG. 7 shows the operating position of this simpler tool during screwing on and off of the end of the staybolt, whereby the threads of the staybolt and hole 23A can be screwed into one another completely free of tension.
  • the inserted thrust bolt 27 can also be left out in the case of a corresponding shortening of the receiver head 22A, and the staybolt can be screwed-in close to the tensioning eccentric.
  • the surface of the tensioning eccentric can then be equipped with V-shaped grooves, running in a peripheral direction, as shown and described in connection with the first embodiment.
  • the hand lever can have a knob at its free end, into which hexagonal or dodecagonal holes are worked in for variable nuts.
  • the preferred tools of the present invention enable a headless screw to be conveniently inserted and/or removed from a structure with minimal effort and minimal chance of damage occurring to the screw.
  • the tool of FIG. 1 enables a single tool to be' adapted for various sized screws. By providing the knob 18 with dodecagonal holes, the same tool can be used to insert or remove nuts on or from the screws.
  • a receiver head having at least one threaded hole for threadingly receiving the inner free end of the threaded fastener
  • a screwing tool according to claim 1 including ribs of V-shaped cross-section extending along the peripheral surface of said eccentric means.
  • a screwing tool according to claim 1 wherein said receiver head includes a plurality of threaded holes distributed around the periphery of said receiver head; a cylinder base extending through a receiver bore in said receiver head, and said receiver bore extending perpendicularly relative to the axis of said threaded holes; said tensioning eccentric comprising a part of said cylinder base with the axis of said cylinder base extending parallel to and offset from the axis of said eccentric means; said receiving head being mounted on said cyl- 7 inder base for frictional rotation relative th'ereto against axial movement relative-thereto.
  • a screwing tool according-to' claim wherein said receiver bore is eccentricallydisposed relative to said receiver head such that the ratio of threaded hole depth to threaded holediameter ,is essentially the same for each of said threaded holes.
  • a screwing tool according to claim 5 wherein said cylinder base includes an extension at one end thereof receiving said hand lever;.said extension being larger than said receiver bore; a springplate being attached adjacent the other end of said cylinder base to bias the receiver head into frictional engagement with said extension.
  • a screwing tool including a cube elementmounted on the distal end of said hand lever; said cube including sockets for receiving nuts.
  • a screwing tool suitable for screwing a headless threaded fastener such as a staybolt or studbolt comprising: a receiver head having at least one threaded hole for threadingly receiving the inner free end of the threaded fastener; a tensioning eccentric pivotally connected to said receiver head; the pivotal axis of said tensioning eccentric being arranged transversely to the axis of the threaded hole; said tensioning eccentric including eccentric surface means arranged to be brought into axial alignment with said threaded hole upon rotation of said tensioning eccentric for exerting an axial force on the inner free end of a threaded fastener, when such fastener is threadingly inserted in said threaded hole, to lock the fastener against rotation relative to said hole; a rotatable hand lever connected to said tensioning eccentric to rotate said eccentric surface means; the point of the shortest distance of said eccentric surface means from said pivotal axis being opposed diametrically to the place of engagement of the hand lever on said tensioning eccentric; the distance
  • a receiver head having a plurality of threaded holes
  • said receiver head being rotatable such that said one hole can be broughtinto suitable position for receiving said threaded fastener, with the axis of said one hole being arranged transversely to, v and in intersecting relationship with, the -.pivotal ';,axis of said tensioning eccentric; a 1
  • said tensioning eccentric including eccentric.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Bolts, Nuts, And Washers (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
US411305A 1973-03-19 1973-10-31 Apparatus for screwing headless threaded fasteners Expired - Lifetime US3892147A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732313609 DE2313609C3 (de) 1973-03-19 Schraubwerkzeug für das Ein- und Ausschrauben von Gewindestiften, Stehbolzen und dergleichen

Publications (1)

Publication Number Publication Date
US3892147A true US3892147A (en) 1975-07-01

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Application Number Title Priority Date Filing Date
US411305A Expired - Lifetime US3892147A (en) 1973-03-19 1973-10-31 Apparatus for screwing headless threaded fasteners

Country Status (6)

Country Link
US (1) US3892147A (zh)
AT (1) AT331740B (zh)
BE (1) BE804671A (zh)
CH (1) CH562664A5 (zh)
FR (1) FR2222177B3 (zh)
NL (1) NL7312219A (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4895055A (en) * 1987-04-28 1990-01-23 Hilti Aktiengesellschaft Installation tool for an anchor element
US6200059B1 (en) 1997-08-19 2001-03-13 Btm Corporation Tool adjustment system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771805A (en) * 1955-09-08 1956-11-27 United Air Lines Inc Stud loosening and tightening tool

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771805A (en) * 1955-09-08 1956-11-27 United Air Lines Inc Stud loosening and tightening tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4895055A (en) * 1987-04-28 1990-01-23 Hilti Aktiengesellschaft Installation tool for an anchor element
US6200059B1 (en) 1997-08-19 2001-03-13 Btm Corporation Tool adjustment system

Also Published As

Publication number Publication date
FR2222177B3 (zh) 1976-08-06
AT331740B (de) 1976-08-25
BE804671A (fr) 1974-01-02
DE2313609B2 (de) 1975-06-26
FR2222177A1 (zh) 1974-10-18
ATA712973A (de) 1975-11-15
CH562664A5 (zh) 1975-06-13
DE2313609A1 (de) 1974-10-03
NL7312219A (zh) 1974-09-23

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