WO1997010064A1 - Dispositif tendeur de cable - Google Patents

Dispositif tendeur de cable Download PDF

Info

Publication number
WO1997010064A1
WO1997010064A1 PCT/NZ1996/000097 NZ9600097W WO9710064A1 WO 1997010064 A1 WO1997010064 A1 WO 1997010064A1 NZ 9600097 W NZ9600097 W NZ 9600097W WO 9710064 A1 WO9710064 A1 WO 9710064A1
Authority
WO
WIPO (PCT)
Prior art keywords
strainer
cog
teeth
length
fixed end
Prior art date
Application number
PCT/NZ1996/000097
Other languages
English (en)
Inventor
Paul Clifford Reid
Original Assignee
Gallagher Group Limited
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 Gallagher Group Limited filed Critical Gallagher Group Limited
Priority to AU68919/96A priority Critical patent/AU6891996A/en
Publication of WO1997010064A1 publication Critical patent/WO1997010064A1/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
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
    • F16G11/12—Connections or attachments, e.g. turnbuckles, adapted for straining of cables, ropes, or wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F9/00—Straining wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F9/00—Straining wire
    • B21F9/002—Straining wire to maintain tension in the wire, e.g. to pull the wire taut

Definitions

  • This invention relates to a strainer.
  • this invention relates to improvements in strainers for use in tensioning lengths of material.
  • Strainers have been in use for a number of years, tensioning the wire used to fence paddocks in both electric and non-electric fences.
  • strainers currently used to tension fences have been designed to tension the relatively long lengths of wire used to delineate a paddock or section off part of a large paddock for sectional grazing.
  • the current strainers operate by having the length of wire to be tensioned secured to a cog pivotally attached to one end of the main body of the strainer.
  • the teeth of the cog interact with a restraining device known as a torsion spring also attached to the main body of the strainer. The interaction is such that the cog may be turned in one direction (tightening the wire) but not the other.
  • the teeth have rounded ends and have an inner surface which is curved. The cog is prevented from turning as a consequence of the torsion spring or other device fitting underneath the curved inner surface of teeth.
  • the depth of curve on the teeth required to hold the torsion spring is such that the teeth have to be a minimum size.
  • the diameter of the cog must be enlarged to accommodate the teeth. This leads to a bulky product which is undesirable.
  • a strainer for straining a length of material including:
  • a restraining device with a free end and a fixed end, the free end having at least one locating surface;
  • a method of constructing a strainer for straining a length of material including:
  • an engaging device having at least one bearing surface associated with the securing device
  • a restraining device with a free end and a fixed end, the free end having at least one locating surface
  • the method being characterised by the steps of positioning the fixed end of the restraining device so that it will be located in a direction opposite to the direction of the force from the bearing surface of the engaging device, on the locating surface of the restraining device of the strainer.
  • the securing device may come in a variety of forms. In a preferred embodiment it is a hole located centrally within the body of the engaging device.
  • the engaging device may come in a variety of forms.
  • the engaging device is a cog with at least one set of teeth on it.
  • the engaging device may be composed of two cogs, each cog having at least one set of teeth, wherein the cogs are attached to each other.
  • the engaging device will be comprised of a substantially circular body having spiked teeth.
  • the bearing surface can also come in a number of different forms.
  • bearing surfaces are teeth on a cog.
  • Each individual tooth may have two surfaces which converge so as to form an angle with respect to the outer circumference of the cog.
  • an individual tooth may comprise two substantially planar surfaces which converge so as to form an angle with respect to the outer circumference of the cog.
  • the teeth may take the form of small projections resembling wagon wheel spokes projecting out of a substantially circular body.
  • a tooth will have one surface which is at a perpendicular angle to the circumference of the cog, with another surface converging with the perpendicular surface which may be substantially curved in shape.
  • the bearing surface shall now be referred to as a tooth (of a cog), but this is an example only and this term should not be seen as limiting.
  • the restraining device may come in a variety of forms.
  • the restraining device is in the form of a cantilever spring.
  • the cantilever spring may be substantially U shaped in form.
  • the cantilever portion of the spring being situated along one of the arms of the U shape of the cantilever spring.
  • This cantilever portion may have a slot or slots which have been cut from the surface of the arm at the end opposite to the fixed portion of the cantilever.
  • the slots are positioned to allow a set number of teeth on the cog or cogs to project between the slot.
  • the restraining device may take the form of a partially resilient bar.
  • restraining device as being a cantilever spring although it should be appreciated that the invention may apply to other types of restraining device.
  • the locating surface may come in a variety of forms.
  • the locating surface is the edge or edges of at least one slot, the edges of the slot being whose which are farthest from the fixed end of the cantilever, the slots being located on the cantilever portion of the spring. It may be this locating edge which bears against the teeth of the cog. Hence it is this surface which prevents movement of the cog in a direction which would allow the tensioned wire to slacken.
  • the length of material shall be referred to as wire although it is envisaged that the invention may apply to other lengths of material such as canvas, nylon, rope, chain and the like.
  • the present invention does not use substantially curved teeth on its cog and does not have the restraining device positioned so that its fixed end is in the direction of force being exerted from the teeth of a cog.
  • a further associated problem also arises due to the interaction between the teeth of the cog and the torsion spring.
  • This problem arises as the region of the torsion spring which interacts with the teeth of the cog, now referred to as the locking bar, is subject to buckling or bending pressure due to the force of the teeth on the locking bar. Therefore, in order to resist the buckling/bending pressure the locking bar must be constructed so it has a certain minimum diameter. Accordingly, the size and curvature on the inner surface of the teeth on the cog, must be such that it can accommodate a locking bar with the set minimum diameter.
  • This interaction between the teeth of the cog and the locking bar gives rise to a fixed relationship between the size of the locking bar's diameter and the size and curvature of the teeth. Accordingly, this fixed relationship can be restrictive when altering the number of teeth on a cog. This problem is particularly apparent when it is desired to increase a number of teeth present on a cog without increasing the cog's diameter.
  • the main problem can be overcome by positioning the restraining cantilever spring so that its fixed end is in the opposite direction to that of the force from the teeth of the cog. If this is done there is no likelihood of the cantilever spring being caused to slip by this force, as its fixed end is not in the direction of least resistance with respect to the force.
  • the tensioning resolution of a strainer can be improved by increasing the number of teeth on a cog without increasing the cog's diameter.
  • Figure 1 is a diagrammatic view of a strainer in accordance with one embodiment of the present invention.
  • Figure 2 is an end view of a cog used in the strainer
  • Figure 3 is an exploded view of components in the strainer illustrated in Figure 1.
  • the strainer 1 comprises of a cantilever spring 2 and a cog 3.
  • the cantilever spring 2 is U shaped and has a cantilever portion 8 on one of the arms of the U shape which is fixed at one end by a bolt 5.
  • the bolt 5 secures an insulator 4 between both sides of the U shaped cantilever spring 2.
  • the cantilever portion 8 has two slots 7 which are cut at the opposite end to the fixed end of the cantilever portion 8 which is secured by the bolt 5.
  • the slots have a locating surface 9 which interacts with the teeth 6 of the cog 3.
  • the excess wire which is taken up during tensioning the wire in the fence is stored in the wire storage area 12 which is situated between the two sets of teeth 13.
  • the strainer 1 operates to tension a fence, as the interaction between the teeth 6 and the locating surface 9 of the cantilever portion 8, only allows the cog 3 to be turned in one direction. In the embodiment shown in figure 1 the only direction in which the cog 3 is permitted to move is towards the fixed end of the cantilever portion 8 secured by the bolt 5.
  • the cog 3 is prevented from moving in a direction away from the fixed end of the cantilever portion 8 secured by the bolt 5 as this is not the direction in which the cantilever portion 8 has its direction of least resistance.
  • Figure 3 is self explanatory in light of Figure 1, as Figure 3 just shows an exploded view of the components used in the strainer depicted in Figure 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtration Of Liquid (AREA)

Abstract

Cette invention concerne un tendeur destiné à tendre une longueur d'un matériau, lequel tendeur comprend un dispositif de fixation maintenant la longueur de matériau, un dispositif d'engagement ayant au moins une surface de support associée au dispositif de fixation, ainsi qu'un dispositif de retenue comportant une extrémité fixe et une extrémité libre, l'extrémité libre comportant au moins une surface de positionnement. Ce tendeur a ceci de particulier que le sens de la force qui s'exerce depuis une surface de support du dispositif d'engagement sur la surface de positionnement du dispositif de retenue, est opposée à l'extrémité fixe du dispositif de retenue, ce qui permet au dispositif de fixation de maintenir la longueur de matériau en relation fixe par rapport au tendeur.
PCT/NZ1996/000097 1995-09-16 1996-09-12 Dispositif tendeur de cable WO1997010064A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU68919/96A AU6891996A (en) 1995-09-16 1996-09-12 Wire tensioning device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ272953 1995-09-16
NZ27295395 1995-09-16

Publications (1)

Publication Number Publication Date
WO1997010064A1 true WO1997010064A1 (fr) 1997-03-20

Family

ID=19925417

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ1996/000097 WO1997010064A1 (fr) 1995-09-16 1996-09-12 Dispositif tendeur de cable

Country Status (3)

Country Link
AU (1) AU6891996A (fr)
WO (1) WO1997010064A1 (fr)
ZA (1) ZA967764B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103128699A (zh) * 2013-02-26 2013-06-05 何胜江 嵌入张紧器
AU2009206158B2 (en) * 2008-08-27 2016-11-10 Robertson Engineering Limited Wire strainer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5635273A (en) * 1973-05-31 1974-12-05 Bamfords Limited Anew or improved tensioner for wire fencing
FR2406318A1 (fr) * 1977-10-14 1979-05-11 Portenseigne Ferrure de fixation de mat d'antenne de television
FR2464411A1 (fr) * 1979-09-05 1981-03-06 Forgeage Decolletage Ste Gle Tendeur pour fil de fer
FR2470902A1 (fr) * 1979-12-06 1981-06-12 Bruggert Paul Tendeur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5635273A (en) * 1973-05-31 1974-12-05 Bamfords Limited Anew or improved tensioner for wire fencing
FR2406318A1 (fr) * 1977-10-14 1979-05-11 Portenseigne Ferrure de fixation de mat d'antenne de television
FR2464411A1 (fr) * 1979-09-05 1981-03-06 Forgeage Decolletage Ste Gle Tendeur pour fil de fer
FR2470902A1 (fr) * 1979-12-06 1981-06-12 Bruggert Paul Tendeur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009206158B2 (en) * 2008-08-27 2016-11-10 Robertson Engineering Limited Wire strainer
CN103128699A (zh) * 2013-02-26 2013-06-05 何胜江 嵌入张紧器

Also Published As

Publication number Publication date
ZA967764B (en) 1997-04-07
AU6891996A (en) 1997-04-01

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