CA1097892A - Mainline choker ring - Google Patents
Mainline choker ringInfo
- Publication number
- CA1097892A CA1097892A CA283,969A CA283969A CA1097892A CA 1097892 A CA1097892 A CA 1097892A CA 283969 A CA283969 A CA 283969A CA 1097892 A CA1097892 A CA 1097892A
- Authority
- CA
- Canada
- Prior art keywords
- choker
- primary
- axis
- secondary apertures
- cable
- 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
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
- F16G11/14—Devices or coupling-pieces designed for easy formation of adjustable loops, e.g. choker hooks; Hooks or eyes with integral parts designed to facilitate quick attachment to cables or ropes at any point, e.g. by forming loops
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ropes Or Cables (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The choker ring has a ring-like body having elements forming a primary aperture defining a primary axis along which a straight mainline cable loosely reeved there-through can extend with the primary aperture serving, in use, to confine the mainline cable therein. The body includes further elements forming a pair of parallel, co-extensive and adjacent secondary apertures which define respective secondary axes extending generally normal to and generally co-planar with the primary axis defined by the primary aperture.
A loop of a choker cable can extend through the secondary apertures in guided and confined relation therewith. Portions of the further elements which form the secondary apertures also define a pair of shoulders. Each shoulder is associated with a respective one of the secondary aperture and they project away from each other in opposite directions generally along a further axis which is co-planar with the primary axis and the secondary axes and is generally parallel to the primary axis defined by the primary aperture. The further elements which form the secondary apertures are arranged such that the secondary apertures are spaced apart generally along the further axis. The further elements which form the secondary apertures including an intermediate leg extending generally at right angles to the further axis between the secondary apertures and define a still further axis which is normal to the primary axis. A limited degree of rotation of a loop of the choker cable can take place about the intermediate leg. Each one of the pair of shoulders includes a surface portion facing inwardly of and defining a portion of its respectively associated secondary aperture. These surface portions form stops which serve to limit the degree or rotation of a loop of choker cable about the still further axis.
The choker ring has a ring-like body having elements forming a primary aperture defining a primary axis along which a straight mainline cable loosely reeved there-through can extend with the primary aperture serving, in use, to confine the mainline cable therein. The body includes further elements forming a pair of parallel, co-extensive and adjacent secondary apertures which define respective secondary axes extending generally normal to and generally co-planar with the primary axis defined by the primary aperture.
A loop of a choker cable can extend through the secondary apertures in guided and confined relation therewith. Portions of the further elements which form the secondary apertures also define a pair of shoulders. Each shoulder is associated with a respective one of the secondary aperture and they project away from each other in opposite directions generally along a further axis which is co-planar with the primary axis and the secondary axes and is generally parallel to the primary axis defined by the primary aperture. The further elements which form the secondary apertures are arranged such that the secondary apertures are spaced apart generally along the further axis. The further elements which form the secondary apertures including an intermediate leg extending generally at right angles to the further axis between the secondary apertures and define a still further axis which is normal to the primary axis. A limited degree of rotation of a loop of the choker cable can take place about the intermediate leg. Each one of the pair of shoulders includes a surface portion facing inwardly of and defining a portion of its respectively associated secondary aperture. These surface portions form stops which serve to limit the degree or rotation of a loop of choker cable about the still further axis.
Description
lQ97E~92 IMPROVED MAINLINE CHOKER ~ING
This invention relates to an improved mainline choker ring particularly suitable for use by the logging industry.
It is common in logging operations to drag felled trees from the woods to a roadside site by vehicles called skidders. A skidder typically includes a steel wire rope mainline (about 100 feet long) which plays out from a winch mounted on the back of the skidder. A number of choker cables are connected to this mainline and,in a typical case, approximately 10 to 15 individual choker cables are connected to a single mainline. A choker cable includes a length of steel wire rope approximately eight feet long having a lassoo at one end to enable the choker cable to wrap around and engage the log with the opposite end of the choker cable being fastened to the mainline by a mainline choker ring. The mainline choker ring, in an ideal case, slide freely on the mainline.
One well known type of mainline choker ring comprises a unitary steel casting serving to define a pair of eyes therethrough. The mainline cable passes through the larger one of these eyes while the choker cable is attached to the other eye. The two eyes are normally disposed at 90 to each other.
One problem with the above-noted type of choker ring is that the relatively small loop of choker cable passing through the smaller eye of the ring has a tendency to ride up the outer side of this eye thus tending to unbalance the pull of the choker cable on the ring thus, in turn, causing the ring to twist sideways on the mainline cable. This action causes the choker ring and its fellows to slide less easily on the mainline or to bind on the mainline thus tending to cause excessive mainline wear as well as other operational difficulties ~.`., lQ97892 in a field.
It is a primary object of the present invention to provide an improved mainline choker ring which serves to alleviate the above-noted difficulties.
Thus, according to one aspect of the invention, there is provided a choker ring comprising a ring-like body having (a) elements forming a primary aperture defining a primary axis along which a straight mainline cable loosely reeved therethrough can extend with the primary aperture serving, in use, to confine the mainline cable therein;
(b) further elements forming a pair of parallel, adjacent and co-extensive secondary apertures defining respective secondary axes extending generally normal to and generally co-planar with said primary axis defined by the primary aperture and through which secondary apertures a loop of a choker cable can extend in guided and confined relation therewith, (c) portions of said further elements which form said secondary apertures also defining a pair of shoulders, each being associated with a respective one of the secondary apertures and which pro-ject away from each other in opposite directions generally alonga further axis which is coplanar with the primary axis and the secondary axes and is generally parallel to the primary axis defined by the primary aperture;
(d) said further elements which form said secondary apertures being arranged such that said secondary apertures are spaced apart generally along said further axis, (e) said further elements which form said secondary apertures including an intermediate leg extending generally at right angles to said further axis between said secondary apertures and defin-ing a still further axis which is normal to said primary axisand about which a limited degree of rotation of a loop of the choker cable can take place, each one of said pair of shoulders including a surface portion facing inwardly of and defining a ~(}978~Z
portion of its respectively associated secondary aperture which surface portions form stops which serve to limit the degree of rotation of the loop of choker cable about said still further axis.
Since the mainline cable is of a substantially larger diameter than the choker cable used, the primary aperture of the choker ring has an average internal diameter which is substan-tially larger than the average internal diameter of each of the secondary apertures. In a preferred form of the invention, the choker ring is of a one-piece or unitary construction, with the surface portions of the elements forming the primary and secondary apertures being generally smoothly contoured to reduce abrasion of and wearing of the mainline and choker cables.
An embodiment of the invention will now be described by way of example, with reference being had to the accompanying drawings in which;
Fig. 1 is a schematic representation of a log skidder and mainline cable with several choker rings and attached choker cables thereon;
Fig. 2 is a side elevation view of a choker ring in accordance with the invention, one end of a choker cable being shown connected thereto;
Fig. 3 is an end elevation view of the improved choker ring also showing an end of the choker cable attached thereto;
Fig. 4 is a bottom plan view of the improved choker ring illustrating the secondary apertures formed in same; and Fig. 5 is a section view of the improved choker ring taken along line 5-5 in Fig. 3 and looking in the direction of the arrows.
With reference now to the drawings, Figure 1 depicts a skidder 10 having a mainline 12 connected thereto. At the 1~78~2 trailing end of the mainline is a mainline ferrule 14. A plural-lty of choker rings 16 are disposed on the mainline, each choker ring 16 having a choker cable 18 secured thereto. Each choker cable has a noose 20 formed on its outer end for connection to a log. After the choker cables 18 are fastened to the felled logs, they are pulled along by the mainline under the influence of the skidder, and a bunch of these logs will trail at the rear end of the mainline 12 when each choker cable is connected to a respective log. During operation it is important that the choker rings 16 be free to slide along the mainline 12 until such time as all of the choker rings are lodged adjacent the trailing end of the mainline 12 with such rings being held there by virtue of the mainline ferrule 14.
With reference now to Figures 2-5, there is illustrated a choker ring arrangement which provides the desired free-sliding action on the mainline. It will be seen that the choker ring includes a ring-like body 24 which is of a unitary or one~piece construction and is preferably made of cast steel tllereby to provide the necessary strength to withstand the relatively high loads encountered during use. The ring-like body 24 includes elements forming a primary aperture 26 which defines a primary axis A-A (Fig. 2) along which a straight mainline cable loosely reeved through aperture 26 can extend. The ring-like body includes further elements forming a pair of parallel, adjacent and co-extensive secondary apertures 28,30, each defining a secondary axis B-B (Fig. 5) extending generally normal to said primary axis A-A (Fig. 2 and 5) and generally co-planar there-with and through which secondary apertures 28, 30, a loop 32 of a choker cable (shown in dashed lines in Fig. 5) can extend.
It will be noted from Figs. 2 and 5 particularly that portions of the elements defining the spaced apart secondary apertures 28 and 30 also serve to define a pair of 1~97~392 shoulders 34, 36, which shoulders project away from each other in opposite directions generally along a further axis C-C (Figs. 2 and 5), which axis is co-planar with the primary and secondary axes and extends generally parallel to the primary axis A-A. It will be further noted that the secondary apertures 28 and 30 are arranged such that they are spaced apart along the above-noted further axis C-C.
Since the mainline cable is of a much greater diameter than any of the choker cables, the primary aperture 26 has a sub-stantially greater average internal diameter than the averageinternal diameter of each of the secondary apertures 28 and 30.
It will be further noted with particular reference to Figs. 4 and 5 that the elements of the ring which form the secondary apertures 28 and 30 include an intermediate leg 40 extending generally at right angles to the further axis C-C
between the secondary apertures, which intermediate leg 40 defines a still further axis which extends normal to the primary axis A-A, and about which secondary axis a limited degree of rotation of the loop 32 of the choker cables can take place. With refer-ence to Fig. 5, it will be seen that the loop 32 of choker cablecan be pivoted back and forth in the direction of arrows E with the degree of rotation of the loop 32 being limited by the "stops" provided by inwardly facing surface portions 34a and 36a of the oppositely directed shoulders 34 and 36. The shoulders 34 and 36 also serve to provide a further important function in that they serve to guide and confine the loop 32 of choker cable in such a way that the loop cannot "ride up" relative to the body of the choker ring as in certain prior art designs but, rather, with the arrangement shown, the pull of the choker cable on the choker ring is always reasonably-well balanced (even though in practice, the choker cable may be at a relatively shallow acute angle with the main-lG97892 line cable) thus reducing problems of the choker ring bindingon the mainline and thus contributing substantially to improved mainline life.
As noted previously, the choker ring may be made of any desirable high strength material, cast steel being preferred. The surfaces of the choker ring, particularly those -surfaces which come into contact with the mainline and choker cables during operation, are relatively smoothly contoured and surfaced thereby to reduce cable wear. The shape or configuration of the outwardly directed surface portions of the choker ring i.e. those portions which do not come into contact with the cables, is not of great practical significance;
however, the shape illustrated in the drawings has been selected so as to provide an attractive overall appearance to the ring as well as conserving material without sacrificing strength.
It will appreciated by those skilled in the art that other modifications of the structure described can be provided without departing from the spirit of the invention.
The above description is provided for purposes of illustration and is not intended to limit the scope of the invention claimed but, rather, the invention is to be limited only by the scope of the claims appended hereto.
This invention relates to an improved mainline choker ring particularly suitable for use by the logging industry.
It is common in logging operations to drag felled trees from the woods to a roadside site by vehicles called skidders. A skidder typically includes a steel wire rope mainline (about 100 feet long) which plays out from a winch mounted on the back of the skidder. A number of choker cables are connected to this mainline and,in a typical case, approximately 10 to 15 individual choker cables are connected to a single mainline. A choker cable includes a length of steel wire rope approximately eight feet long having a lassoo at one end to enable the choker cable to wrap around and engage the log with the opposite end of the choker cable being fastened to the mainline by a mainline choker ring. The mainline choker ring, in an ideal case, slide freely on the mainline.
One well known type of mainline choker ring comprises a unitary steel casting serving to define a pair of eyes therethrough. The mainline cable passes through the larger one of these eyes while the choker cable is attached to the other eye. The two eyes are normally disposed at 90 to each other.
One problem with the above-noted type of choker ring is that the relatively small loop of choker cable passing through the smaller eye of the ring has a tendency to ride up the outer side of this eye thus tending to unbalance the pull of the choker cable on the ring thus, in turn, causing the ring to twist sideways on the mainline cable. This action causes the choker ring and its fellows to slide less easily on the mainline or to bind on the mainline thus tending to cause excessive mainline wear as well as other operational difficulties ~.`., lQ97892 in a field.
It is a primary object of the present invention to provide an improved mainline choker ring which serves to alleviate the above-noted difficulties.
Thus, according to one aspect of the invention, there is provided a choker ring comprising a ring-like body having (a) elements forming a primary aperture defining a primary axis along which a straight mainline cable loosely reeved therethrough can extend with the primary aperture serving, in use, to confine the mainline cable therein;
(b) further elements forming a pair of parallel, adjacent and co-extensive secondary apertures defining respective secondary axes extending generally normal to and generally co-planar with said primary axis defined by the primary aperture and through which secondary apertures a loop of a choker cable can extend in guided and confined relation therewith, (c) portions of said further elements which form said secondary apertures also defining a pair of shoulders, each being associated with a respective one of the secondary apertures and which pro-ject away from each other in opposite directions generally alonga further axis which is coplanar with the primary axis and the secondary axes and is generally parallel to the primary axis defined by the primary aperture;
(d) said further elements which form said secondary apertures being arranged such that said secondary apertures are spaced apart generally along said further axis, (e) said further elements which form said secondary apertures including an intermediate leg extending generally at right angles to said further axis between said secondary apertures and defin-ing a still further axis which is normal to said primary axisand about which a limited degree of rotation of a loop of the choker cable can take place, each one of said pair of shoulders including a surface portion facing inwardly of and defining a ~(}978~Z
portion of its respectively associated secondary aperture which surface portions form stops which serve to limit the degree of rotation of the loop of choker cable about said still further axis.
Since the mainline cable is of a substantially larger diameter than the choker cable used, the primary aperture of the choker ring has an average internal diameter which is substan-tially larger than the average internal diameter of each of the secondary apertures. In a preferred form of the invention, the choker ring is of a one-piece or unitary construction, with the surface portions of the elements forming the primary and secondary apertures being generally smoothly contoured to reduce abrasion of and wearing of the mainline and choker cables.
An embodiment of the invention will now be described by way of example, with reference being had to the accompanying drawings in which;
Fig. 1 is a schematic representation of a log skidder and mainline cable with several choker rings and attached choker cables thereon;
Fig. 2 is a side elevation view of a choker ring in accordance with the invention, one end of a choker cable being shown connected thereto;
Fig. 3 is an end elevation view of the improved choker ring also showing an end of the choker cable attached thereto;
Fig. 4 is a bottom plan view of the improved choker ring illustrating the secondary apertures formed in same; and Fig. 5 is a section view of the improved choker ring taken along line 5-5 in Fig. 3 and looking in the direction of the arrows.
With reference now to the drawings, Figure 1 depicts a skidder 10 having a mainline 12 connected thereto. At the 1~78~2 trailing end of the mainline is a mainline ferrule 14. A plural-lty of choker rings 16 are disposed on the mainline, each choker ring 16 having a choker cable 18 secured thereto. Each choker cable has a noose 20 formed on its outer end for connection to a log. After the choker cables 18 are fastened to the felled logs, they are pulled along by the mainline under the influence of the skidder, and a bunch of these logs will trail at the rear end of the mainline 12 when each choker cable is connected to a respective log. During operation it is important that the choker rings 16 be free to slide along the mainline 12 until such time as all of the choker rings are lodged adjacent the trailing end of the mainline 12 with such rings being held there by virtue of the mainline ferrule 14.
With reference now to Figures 2-5, there is illustrated a choker ring arrangement which provides the desired free-sliding action on the mainline. It will be seen that the choker ring includes a ring-like body 24 which is of a unitary or one~piece construction and is preferably made of cast steel tllereby to provide the necessary strength to withstand the relatively high loads encountered during use. The ring-like body 24 includes elements forming a primary aperture 26 which defines a primary axis A-A (Fig. 2) along which a straight mainline cable loosely reeved through aperture 26 can extend. The ring-like body includes further elements forming a pair of parallel, adjacent and co-extensive secondary apertures 28,30, each defining a secondary axis B-B (Fig. 5) extending generally normal to said primary axis A-A (Fig. 2 and 5) and generally co-planar there-with and through which secondary apertures 28, 30, a loop 32 of a choker cable (shown in dashed lines in Fig. 5) can extend.
It will be noted from Figs. 2 and 5 particularly that portions of the elements defining the spaced apart secondary apertures 28 and 30 also serve to define a pair of 1~97~392 shoulders 34, 36, which shoulders project away from each other in opposite directions generally along a further axis C-C (Figs. 2 and 5), which axis is co-planar with the primary and secondary axes and extends generally parallel to the primary axis A-A. It will be further noted that the secondary apertures 28 and 30 are arranged such that they are spaced apart along the above-noted further axis C-C.
Since the mainline cable is of a much greater diameter than any of the choker cables, the primary aperture 26 has a sub-stantially greater average internal diameter than the averageinternal diameter of each of the secondary apertures 28 and 30.
It will be further noted with particular reference to Figs. 4 and 5 that the elements of the ring which form the secondary apertures 28 and 30 include an intermediate leg 40 extending generally at right angles to the further axis C-C
between the secondary apertures, which intermediate leg 40 defines a still further axis which extends normal to the primary axis A-A, and about which secondary axis a limited degree of rotation of the loop 32 of the choker cables can take place. With refer-ence to Fig. 5, it will be seen that the loop 32 of choker cablecan be pivoted back and forth in the direction of arrows E with the degree of rotation of the loop 32 being limited by the "stops" provided by inwardly facing surface portions 34a and 36a of the oppositely directed shoulders 34 and 36. The shoulders 34 and 36 also serve to provide a further important function in that they serve to guide and confine the loop 32 of choker cable in such a way that the loop cannot "ride up" relative to the body of the choker ring as in certain prior art designs but, rather, with the arrangement shown, the pull of the choker cable on the choker ring is always reasonably-well balanced (even though in practice, the choker cable may be at a relatively shallow acute angle with the main-lG97892 line cable) thus reducing problems of the choker ring bindingon the mainline and thus contributing substantially to improved mainline life.
As noted previously, the choker ring may be made of any desirable high strength material, cast steel being preferred. The surfaces of the choker ring, particularly those -surfaces which come into contact with the mainline and choker cables during operation, are relatively smoothly contoured and surfaced thereby to reduce cable wear. The shape or configuration of the outwardly directed surface portions of the choker ring i.e. those portions which do not come into contact with the cables, is not of great practical significance;
however, the shape illustrated in the drawings has been selected so as to provide an attractive overall appearance to the ring as well as conserving material without sacrificing strength.
It will appreciated by those skilled in the art that other modifications of the structure described can be provided without departing from the spirit of the invention.
The above description is provided for purposes of illustration and is not intended to limit the scope of the invention claimed but, rather, the invention is to be limited only by the scope of the claims appended hereto.
Claims (4)
1. A choker ring comprising a ring-like body having (a) elements forming a primary aperture defining a primary axis along which a straight mainline cable loosely reeved therethrough can extend with the primary aperture serving, in use, to confine the mainline cable therein;
(b) further elements forming a pair of parallel, adjacent and co-extensive secondary apertures defining respective secondary axes extending generally normal to and generally co-planar with said primary axis defined by the primary aperture and through which secondary apertures a loop of a choker cable can extend in guided and confined relation therewith, (c) portions of said further elements which form said secondary apertures also defining a pair of shoulders, each being asso-ciated with a respective one of the secondary apertures and which project away from each other in opposite directions generally along a further axis which is coplanar with the primary axis and the secondary axes and is generally parallel to the primary axis defined by the primary aperture;
(d) said further elements which form said secondary apertures being arranged such that said secondary apertures are spaced apart generally along said further axis, (e) said further elements which form said secondary apertures including an intermediate leg extending generally at right angles to said further axis between said secondary apertures and defining a still further axis which is normal to said primary axis and about which a limited degree of rotation of a loop of the choker cable can take place, each one of said pair of shoulders includ-ing a surface portion facing inwardly of and defining a portion of its respectively associated secondary aperture which surface portions form stops which serve to limit the degree of rotation of the loop of choker cable about said still further axis.
(b) further elements forming a pair of parallel, adjacent and co-extensive secondary apertures defining respective secondary axes extending generally normal to and generally co-planar with said primary axis defined by the primary aperture and through which secondary apertures a loop of a choker cable can extend in guided and confined relation therewith, (c) portions of said further elements which form said secondary apertures also defining a pair of shoulders, each being asso-ciated with a respective one of the secondary apertures and which project away from each other in opposite directions generally along a further axis which is coplanar with the primary axis and the secondary axes and is generally parallel to the primary axis defined by the primary aperture;
(d) said further elements which form said secondary apertures being arranged such that said secondary apertures are spaced apart generally along said further axis, (e) said further elements which form said secondary apertures including an intermediate leg extending generally at right angles to said further axis between said secondary apertures and defining a still further axis which is normal to said primary axis and about which a limited degree of rotation of a loop of the choker cable can take place, each one of said pair of shoulders includ-ing a surface portion facing inwardly of and defining a portion of its respectively associated secondary aperture which surface portions form stops which serve to limit the degree of rotation of the loop of choker cable about said still further axis.
2. The choker ring of claim 1 wherein the primary aperture is substantially larger than each of the secondary apertures.
3. The choker ring of claim 1 or claim 2 wherein the choker ring is of a one-piece or unitary construction, with surface portions of the elements forming the primary and secondary apertures being contoured to reduce abrasion of and wear on mainline and choker cables.
4. The choker ring of claim 1 in combination with a choker cable, said choker cable having a loop formed at one end thereof, which loop passes through said secondary apertures and about said intermediate leg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA283,969A CA1097892A (en) | 1977-08-03 | 1977-08-03 | Mainline choker ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA283,969A CA1097892A (en) | 1977-08-03 | 1977-08-03 | Mainline choker ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1097892A true CA1097892A (en) | 1981-03-24 |
Family
ID=4109267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA283,969A Expired CA1097892A (en) | 1977-08-03 | 1977-08-03 | Mainline choker ring |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1097892A (en) |
-
1977
- 1977-08-03 CA CA283,969A patent/CA1097892A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |