WO2000055512A1 - Joint a vis - Google Patents

Joint a vis Download PDF

Info

Publication number
WO2000055512A1
WO2000055512A1 PCT/SE2000/000430 SE0000430W WO0055512A1 WO 2000055512 A1 WO2000055512 A1 WO 2000055512A1 SE 0000430 W SE0000430 W SE 0000430W WO 0055512 A1 WO0055512 A1 WO 0055512A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
segment
segments
hole
threads
Prior art date
Application number
PCT/SE2000/000430
Other languages
English (en)
Inventor
Torbjörn DAHL
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU36882/00A priority Critical patent/AU3688200A/en
Publication of WO2000055512A1 publication Critical patent/WO2000055512A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/284—Locking by means of elastic deformation
    • F16B39/286—Locking by means of elastic deformation caused by saw cuts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/041—Specially-shaped shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • F16B5/025—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread specially designed to compensate for misalignement or to eliminate unwanted play

Definitions

  • the present invention relates to a screw joint comprising a screw which includes a resilient segment, and a screw hole, wherewith either the screw hole or the screw is provided with especially designed threads.
  • the invention can be applied advantageously for trimming, for instance, high frequency components that require tuning, such as filters, oscillators or multiplexors, for example.
  • Components that shall be used at microwave frequencies must be manufactured with very great precision, for instance with respect to the geometrical dimensions of the components. These high precision requirements are difficult to fulfil in one single manufacturing step. Furthermore, it is beneficial to be able to adjust the frequency relationship of such components even after manufacture. Consequently, the component structure is machined with less precision in a first manufacturing stage and is then trimmed to the desired frequency .
  • trimming can be effected with the aid of one or more trimming screws which are inserted to a given depth in the filter, wherewith the filter frequency can be finely adjusted by adjusting the depth of penetration of the screw in the filter.
  • This frequency adjustment must be effected accurately and also so that the filter will remain trimmed when later used in a system in operation.
  • One simple method of endeavouring to stabilise the position of the trimming screw, and thus the set frequency has been to lock the screw in its desired position by means of a nut.
  • One drawback with this simple solution is that there is always a certain amount of clearance between the threads and screw of a typical screw joint. This clearance can be avoided by tightening the lock nut, although this will result, at the same time, in deviations from the set values.
  • a trimming device that does not use lock nuts is described, for instance, in U.S. Re. 30 406. Trimming is effected by- means of a screw which comprises two threaded segments of mutually the same dimensions and a plain segment, i.e. an unthreaded segment, which includes two radial slots and which is placed between said threaded segments .
  • This plain and resilient element integral with the screw is intended to take up the clearance between the screw and the thread.
  • the trimming device also includes a threaded sleeve.
  • the screw is fitted by first compressing the screw axially so as to offset the two threaded segments relative to each other and so as to obtain a resilient screw joint. The screw is then screwed into the threaded sleeve. In a first position, the threads on the screw will be somewhat oblique due to the spring effect, but are straightened with the aid of the internal threads of the sleeve as the screw is screwed into said sleeve.
  • U.S. 2,542,377 A describes a self-locking screw which comprises two threaded segments of mutually the same diameter and the same pitch, and a plain, unthreaded, resilient segment disposed between said two threaded segments .
  • the threads of the threaded segments are arranged with a negative axial offset.
  • the plain segment is made resilient by providing circular slots symmetrically around the segment and its resiliency is further amplified by providing the screw with an axial bore at the underside of the screw, with the slots penetrating into said bore.
  • the screw hole that fits the screw is provided with a unitary and through-passing thread (c.f . column 3, lines 5-58) .
  • the present invention relates to a screw joint in association with components that require tuning, preferably a screw joint for trimming microwave components, which will enable accurate frequency settings to be achieved.
  • One object of the invention is to provide a screw joint with which a spring action can be obtained in the screw so as to eliminate clearance between screw and thread, and with which no further devices are required to achieve this function.
  • Another object of the invention is to provide a screw joint which can be used to trim microwave components, e.g. cavity filters, and, when used with a waveguide, the bias of which can be controlled far out towards the waveguide .
  • microwave components e.g. cavity filters
  • a screw joint that includes a threaded screw hole and a screw which comprises two threaded segments, preferably of two different diameters, and a plain, unthreaded, and resilient segment disposed between said threaded segments, wherewith either the in lead of the two threaded segments of the screw or the in lead of the corresponding threads in the screw hole are offset relative to each other through a given angle .
  • the invention is based on the realisation that screw torque is influenced by the occurring thread tolerances, wherewith a poor thread fit will result in a lower torque.
  • the screw torque can be raised by providing the screw or the threaded hole with two different threads, so that the offset between the in leads of respective thread systems will be proportional to the torque that can be exerted on the screw.
  • One advantage afforded by the inventive screw joint is that when used as a waveguide trimming screw, the pre-stress in the screw can be controlled towards the waveguide.
  • Another advantage afforded by the invention is that accurate trimming can be achieved when used as a microwave component, wherewith the position of the screw can be fixed in the absence of any clearance or play. Trimming is effected solely by means of the screw without requiring the use of other devices such as a threaded sleeve or a lock nut. This enables a trimming screw to be fitted in a space saving fashion while facilitating fitting of the screw, since the screw need only be manipulated one more time for compression of the screw.
  • inventive device can be applied at two different locations, by providing the specially configured threads either on the screw or in the screw hole in the material in which the screw shall be fitted.
  • Figures la-lc illustrate the preferred embodiment of the inventive trimming screw in two views, and also show corresponding thread arrangements in the screw hole .
  • Figures 2a-2c illustrate an alternative embodiment of the inventive trimming screw in two views, and also show corresponding thread arrangements in the screw hole.
  • Figure 3 illustrates an inventive screw joint in a contemplated component, for instance a cavity filter.
  • an inventive screw joint can be applied either in the screw hole or, correspondingly, on the screw. There is achieved in both instances a screw joint in which the play or clearance between the threads of the screw hole and of the screw is eliminated so that the pre-stress of the screw can be controlled towards the waveguide.
  • FIGS la-lc illustrate the preferred embodiment of an inventive screw joint.
  • the screw 10 is comprised of two threaded screw segments 11 and 12 of mutually the same pitch.
  • the diameter of the first screw segment 11 is slightly larger than the diameter of the second screw segment 12. More specifically, the smallest inner diameter of the first threaded screw segment 11 must be larger than the maximum outer diameter of the second threaded screw segment 12.
  • Between the first screw segment 11 and the second screw segment 12 is a plain, i.e.unthreaded, resilient segment 13 whose diameter corresponds to the outer diameter of the second threaded screw segment 12.
  • the resilient segment 13 of the illustrated embodiment includes two radially extending slots 14a and 14b which are situated on mutually opposite sides of said segment.
  • the slots 14a and 14b are disposed one above the other and are narrow in relation to the length of the resilient segment and slightly deeper than half the diameter of the screw in the vicinity of the resilient segment.
  • an appropriate screwdriver slot 15 is provided at the top of the screw.
  • the screw hole is comprised of a first and a second threaded hole-segment 17 and 18 whose diameters are adapted to the respective diameters of the first and second screw segments 11 and 12.
  • the thread arrangement of an inventive screw joint can preferably be applied in the screw hole into which the screw 10 shall be fitted.
  • the diameter of the first hole-segment 17 and the first screw segment 11 must be greater than the diameter of the second hole-segment 18 and the second screw segment 12 in the case of this application.
  • An essential characteristic in this respect is that the points at which the lead turns of the threads of the hole-segments begin at respective upper edges of the hole-segment are offset relative to one another through a given angle.
  • the screw segments 11 and 12 are formed with conventional threads with no axial mismatch.
  • the special thread arrangement of an inventive screw joint can be applied on the screw 10.
  • the screw 10 is characterised by how the threads are arranged on the first and the second threaded screw segments 11 and 12.
  • An important characteristic feature is that the points at which the lead turns of the threads of said screw segments begin at respective bottom edges of the screw segment are offset relative to one another through a given angle.
  • the hole segments 17 and 18 are provided with standard threads with no axial mismatch.
  • the resilient segment 13 of the screw is either axially extended or axially compressed in both application alternatives.
  • the modus operandi of the screw is determined essentially by the geometric dimensions of the screw joint. More specifically, it is determined by the order in which the screw segments are screwed into their corresponding hole segments.
  • the narrower screw segment 12 is screwed-in first. This is achieved with a screw joint in which the combined length of the second screw segment 12 and the plain segment 13 is greater than the length of the first hole-segment 17.
  • the first screw segment 11 shall then be screwed in, it is necessary to first turn the screw through a certain angle before screwing of the screw into the hole segment can be commenced, whereas the other screw segment 12 can be screwed into its hole segment in a normal fashion.
  • the slots 14a and 14b are drawn apart wherewith a pulling effect is obtained in the resilient segment 13, so that the joint will be resilient.
  • the thicker screw segment 11 is screwed-in first. This is achieved with a screw joint in which the total length of the second screw segment 12 and the plain segment 13 is smaller than the length of the first hole segment 17.
  • the second screw segment 12 shall then be screwed-in, it is necessary to first turn the screw through a certain angle before screwing of the screw segment into its hole segment can be commenced, whereas the first screw segment 11 is screwed into its hole segment in a normal fashion.
  • the slots 14a and 14b are drawn together, therewith compressing the resilient segment 13.
  • Figure 3 illustrates the use of the preferred embodiment illustrated in Figure 1 with a cavity filter 36 that includes a cavity 39.
  • the narrower segments 32 and 33 of the screw are longer than the first hole segment 37, so as to obtain a spring action.
  • the second threaded screw segment 32 is inserted in the first hole-segment 37 in a first step, whereafter screwing of this screw segment 37 in the second hole segment 38 is commenced. Screwing of the first screw segment 31 into the first hole segment 37 is commenced in a second step.
  • the threads at either the two hole segments 37 and 38 or on the two screw segments 31 and 32 have been formed so that the points at which their respective lead turns begin are offset relative to one another through a certain angle.
  • a screw that includes the inventive arrangement can be varied in accordance with different alternative embodiments.
  • the smallest internal diameter of the first threaded screw segment 11 is greater than the maximum external diameter of the second threaded screw segment 12.
  • the diameter of the resilient segment 13 corresponds to the outer diameter of the second screw segment 12.
  • the screw 20 may alternatively have a construction in which the first and the second threaded screw-segments 21 and 22 have mutually the same diameter.
  • the plain resilient segment 23 will have a diameter that corresponds to the inner diameter of the screw segments and will include two radial slots 24a and 24b as described in Figure 1.
  • the inventive thread arrangement is provided solely on the screw segments 21 and 22.
  • the corresponding screw hole in the component 26 is comprised of one single segment 27 provided with a conventional thread. The resiliency in the screw is achieved by mismatching the points at which the lead turns of the screw segment threads begin at the bottom edge of respective screw segments through a given angle .
  • the screw 10 can be used beneficially for microwave component applications, e.g. with cavity filters or other equipment where trimming is required.
  • the screw is made of a material that has good electric conductivity and is formed as a solid body without cavities at the bottom surface of the screw, such cavities otherwise resulting in the leakage of field lines into the screw.
  • the spring effect obtained with the screw is achieved by providing a segment with slots that extend radially and that have a given depth.
  • the resilient segment must be dimensioned so that its resilience is able to take up the clearance between the threads on the screw and the threads in the screw hole, any such clearance resulting in a lower torque.
  • the resilient segment of the preferred embodiment is provided with two slots.
  • the tension in the screw can be controlled by varying the offset between the lead turns of respective thread systems on the screw or in the threaded hole. This difference of degree must at least be sufficiently large to take-up the tolerance difference between screw and the threaded hole.
  • the difference in degree must, however, also be adapted to the resiliency of the resilient segment, so that this segment can be fully compressed by the rotation achieved through the difference in degree.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

Cette invention a trait à un joint à vis comportant une vis pourvue d'un segment élastique et un alésage pour vis, l'alésage ou la vis comportant un filetage spécialement dessiné. Le joint à vis comporte un alésage fileté et une vis pourvue de deux segments filetés, de préférence de diamètre différent, ainsi que d'un segment élastique, lisse et sans filets, placé entre les segments filetés. Le pas interne des deux segments filetés de la vis ou le pas interne des filets correspondants de l'alésage sont décalés selon un angle donné. Lorsque la vis tourne, le segment élastique est, soit dilaté axialement, soit comprimé axialement, de sorte que n'y a plus de jeu entre les filets de l'alésage et la vis. On peut utiliser ce joint à vis, par exemple pour l'ajustage de composants haute fréquence.
PCT/SE2000/000430 1999-03-12 2000-03-03 Joint a vis WO2000055512A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU36882/00A AU3688200A (en) 1999-03-12 2000-03-03 A screw joint

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9900896-3 1999-03-12
SE9900896A SE513785C2 (sv) 1999-03-12 1999-03-12 Skruvförband där skruven kan förspännas

Publications (1)

Publication Number Publication Date
WO2000055512A1 true WO2000055512A1 (fr) 2000-09-21

Family

ID=20414820

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2000/000430 WO2000055512A1 (fr) 1999-03-12 2000-03-03 Joint a vis

Country Status (3)

Country Link
AU (1) AU3688200A (fr)
SE (1) SE513785C2 (fr)
WO (1) WO2000055512A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140318309A1 (en) * 2013-04-26 2014-10-30 Bell Sports, Inc. Universal Bicycle Pedal
CN114207339A (zh) * 2019-06-14 2022-03-18 瑞士科技创新股份公司 管接头施加器和接头产生方法
CN114641359A (zh) * 2019-10-26 2022-06-17 兰佩莫斯纳新东有限公司 在3d打印机中生成颗粒状构建材料层的装置和方法
CN114760830A (zh) * 2019-10-02 2022-07-15 阿格洛温国际公司 土壤作业机器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2035055A (en) * 1935-07-05 1936-03-24 Wilcox Rich Corp Locking device
US2542377A (en) * 1946-12-21 1951-02-20 Eaton Mfg Co Self-locking screw

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2035055A (en) * 1935-07-05 1936-03-24 Wilcox Rich Corp Locking device
US2542377A (en) * 1946-12-21 1951-02-20 Eaton Mfg Co Self-locking screw

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140318309A1 (en) * 2013-04-26 2014-10-30 Bell Sports, Inc. Universal Bicycle Pedal
CN114207339A (zh) * 2019-06-14 2022-03-18 瑞士科技创新股份公司 管接头施加器和接头产生方法
CN114760830A (zh) * 2019-10-02 2022-07-15 阿格洛温国际公司 土壤作业机器
CN114641359A (zh) * 2019-10-26 2022-06-17 兰佩莫斯纳新东有限公司 在3d打印机中生成颗粒状构建材料层的装置和方法

Also Published As

Publication number Publication date
SE9900896L (sv) 2000-09-13
SE9900896D0 (sv) 1999-03-12
SE513785C2 (sv) 2000-11-06
AU3688200A (en) 2000-10-04

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