CA1107788A - Log choker hood - Google Patents
Log choker hoodInfo
- Publication number
- CA1107788A CA1107788A CA341,606A CA341606A CA1107788A CA 1107788 A CA1107788 A CA 1107788A CA 341606 A CA341606 A CA 341606A CA 1107788 A CA1107788 A CA 1107788A
- Authority
- CA
- Canada
- Prior art keywords
- choker
- aperture
- pin
- recess
- threaded
- 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
Abstract
TITLE: LOG CHOKER HOOK
Abstract of the Disclosure A choker hook slideably mountable to a winch line and receiving one end of a choker cable or chain. The hook is comprised of an elongated body having an opening for receiv-ing a winch line. The body will slide freely along the winch line. A lower portion of the body is bifurcated to define an open recess. A choker cable loop or an eyelet of a "keyhole grab" may be received within the recess. A threaded pin is provided to threadably connect the bifurcations and selectively close the recess. A sheave is rotatably received on the pin and may be located within the recess to receive a portion of a cable loop. The pin may be easily removed and attached to the choker hook body to facilitate quick attachment and removal of a choker cable. If a "keyhole grab" is being used, the sheave may be removed. The pin alone is then used to close the recess.
Abstract of the Disclosure A choker hook slideably mountable to a winch line and receiving one end of a choker cable or chain. The hook is comprised of an elongated body having an opening for receiv-ing a winch line. The body will slide freely along the winch line. A lower portion of the body is bifurcated to define an open recess. A choker cable loop or an eyelet of a "keyhole grab" may be received within the recess. A threaded pin is provided to threadably connect the bifurcations and selectively close the recess. A sheave is rotatably received on the pin and may be located within the recess to receive a portion of a cable loop. The pin may be easily removed and attached to the choker hook body to facilitate quick attachment and removal of a choker cable. If a "keyhole grab" is being used, the sheave may be removed. The pin alone is then used to close the recess.
Description
11~77~3 The present invention is related to cable and chain connections for winch lines utilized in the logging industry.
More specifically, it is related to choker hooks of the type that slide along a winch line and provide removable connection for choker cables and chains.
In logging operations it is common to pull trees from the cutting area to a landing where they can be loaded onto trucks. For this purpose a winch is usually provided or a con-nection to a wheeled or track type vehicle is made with a heavy cable winch line. Several "choker" cables or chains are typ-ically slidably mounted to the winch line by "cable slides"
which move freely along the length of the winch line. The end of the winch line is usually provided with a swaged ferrule.
The ferrule offers resistance to free movement of the choker hooks and pulls against the hooks as the winch line is drawn toward the land area.
Choker hooks vary in design. Some choker hooks are permanently mounted to the winch line and are likewise fastened to an end of the choker cable or chain. In some cases, this proves to be undesirable, particularly with the difficulty pre-sented in removing and replacing broken choker line or chain.
Other forms of choker lines have swaged ferrules at their free ends which are inserted and turned within choker hook bodies.
This is done in such a manner that the choker lines cannot escape when the choker line is in tension. With other forms, a choker cable may be looped onto itself and fastened with an appropriate connection. The loop is then fitted through a hook or other releasable engagement apparatus provided on the choker hook.
When choker chains are used, it is not uncommon to pro-vide a "keyhole grab" intermediate the chain and the choker hook. In some situations both chains and cables are used, or 77~8 it at least becomes a desirable feature to be able to inter-change chains or cables while utilizing the same choker hook.
The difficulty comes in providing a hook that will adequately receive a keyhole grab and that will also mount a cable hook without kinking and destructively stressing the cable. The bend radius about the hook is usually relatively small, resulting in a kink of the cable when tension cables wear and break frequently at the loop area while the remainder of the cable remains usable.
It therefore becomes desirable to obtain some form of choker hook that may be utilized either with choker chains or cables and that will protect cables against damage from kinking and wear by friction.
A preferred form of the present invention is illus-trated in the accompanying drawings in which:
Fig. 1 is an elevational side view of the present log choker hook;
Fig. 2 is a view as seen from the left in Fig. 1 only showing a portion of one of the bifurcations broken away;
Fig. 3 is a detailed view of the pin for my choker hook;
Fig. 4 is an operational view showing the choker hook in conjunction with a choker cable; and Fig. 5 is a view similar to Fig. 4 only showing opera-tion of the present choker hook with a keyhole grab and a choker chain.
The choker hook embodying a preferred form of the present invention is designated in the drawiny by the reference character 10. The present choker hook 10 is intended to be utilized along the length of a ~inch line 11 such as that partially shown by Figs 4 and 5. The end of the winch line typically includes a swaged ferrule 12 which prevents the choker 1~377~
hook from sliding off of the winch line.
The choker hook 10 is designed to releasably mount either a choker cab]e 13 or a choker chain 16. The cable 13 includes a loop 14 formed along its length and held in place by a connection 15. The chain 16 is provided with a "keyhole grab" 17. The keyhole grab typically includes a circular section 18 that leads into a narrow slot 19 for receiving and locking a chain link in place.
Specific details of the present choker hook 10 may best be seen with reference to Figs. 1 and 3. There it may be seen that the choker hook 10 is comprised of an elongated rigid body 2~. The body 20 includes a transverse opening 23 (Fig.2) through which the winch line 11 may be slideably received. It is preferred that the opening 23 be flared at both ends to pro-vide a smooth surface for sliding over the winchline without gouging or otherwise damaging the winchline. The body 20 also includes longitudinally projecting bifurcations 26.
The bifurcations 26 define an open recess 27 which may receive either the choker cable loop 14 or the keyhole grab 17.
The recess extends from an upper closed end 28 that is adjacent to the opening 23 to an open end defined by ends 30 of the bi-furcations 26. The recess 2? extends through the body sub-stantially parallel with the transverse opening 23.
An aperture 31 is formed through one of the bifurca-tions 26. It extends through the bifurcation in a direction trar;sverse to the opening 23. A threaded aperture 32 is formed through the remaining bifurcation and is axially aligned with the first aperture 31. The apertures are aligned along an axis that is perpendicular to opposite parallel side surfaces 33 of the body 21 and to the opening 23.
The apertures 31 and 32 are designed to receive a pin 34 that is shown in detail by Fig. 3. The pin 34 includes a 1~77~8 threaded end 35 that may be threadably received within aperture 32. The shank 36 of pin 34 is slideably received through the aperture 31 and is formed of a smooth cylindrical surface. Opposite the threaded end 35 is a headed end 39. End 39 includes a shoulder 37 that is of a dimension substantially larger than the aperture 31. A bolthead 38 projects outwardly from the shoulder 37. The bolthead is shown as being rect-angular so it may be utilized as a handhold for the choker setter or may also be turned by an appropriate wrench.
The cylindrical shank 36 of the pin 34 may be utilized to releasably receive a sheave 41. The sheave 41 includes a central bore 42 of a diameter slightly greater than the diameter of the end shank to facilitate free rotation thereon. Sheave 41 also includes a peripheral groove 43 that is complementary to the cross-sectional configuration of the type of cable being utilized.
The pin 34 and sheave 41 are easily attached and re-moved from the body. The sheave 41 may be inserted into the recess to a position in alignment with the apertures 31 and 32.
The pin is then inserted through the successive apertures 31, 42 and threaded into aperture 32 to rotatably secure the sheave within the recess. Removal of the sheave is accomplished by re-versing the steps described above.
In order to connect the present choker hook to a choker chain 16, the choker setter first removes the pin and sheave 41 from the body 21 by threadably disengaging the pin from threaded aperture 32 and pulling it axially from the sheave bore and aperture 31. He may then pocket the sheave or otherwise store it for future use when a choker cable is to be utilized. The circular section 18 of the keyhole yrab 17 can then be ins~rted within the recess 27 to a position between the closed end 28 and apertures 31 and 32. The pin is then reinserted and thread-77~
ably tightened within the aperture 32 to lock both itselfand the keyhole grab in place on the hook 10. The choker chain can then be connected and disconnected in the usual manner.
When looped choker cables 13 are utilized, the choker setter will first unassemble the hook as described above. He may then place the loop 14 over the loose sheave 41 so the cable is engaged within the groove 43. He then inserts the sheave and loop into the recess 27. The sheave 41 is positioned with its bore in alignment with apertures 30 and 31. Then the pin is placed through the apertures and is threadably secured.
The sheave 41 is designed and may be produced for use in conjunction with different forms of cable, its diameter can be selected to match the cross-sectional diameter of the cable being used. Therefore, there is no chance that the cable loop will kink or rub frictionally against any part of the hook 10 while it is under tension. The correct diameter of the sheave insures that the cable strands will not be excessively stressed during operation~
The above description was given to set fo:rth a preferred example of the present invention. It was not intended to restrict the scope of my invention which is set forth only by the following claim.
More specifically, it is related to choker hooks of the type that slide along a winch line and provide removable connection for choker cables and chains.
In logging operations it is common to pull trees from the cutting area to a landing where they can be loaded onto trucks. For this purpose a winch is usually provided or a con-nection to a wheeled or track type vehicle is made with a heavy cable winch line. Several "choker" cables or chains are typ-ically slidably mounted to the winch line by "cable slides"
which move freely along the length of the winch line. The end of the winch line is usually provided with a swaged ferrule.
The ferrule offers resistance to free movement of the choker hooks and pulls against the hooks as the winch line is drawn toward the land area.
Choker hooks vary in design. Some choker hooks are permanently mounted to the winch line and are likewise fastened to an end of the choker cable or chain. In some cases, this proves to be undesirable, particularly with the difficulty pre-sented in removing and replacing broken choker line or chain.
Other forms of choker lines have swaged ferrules at their free ends which are inserted and turned within choker hook bodies.
This is done in such a manner that the choker lines cannot escape when the choker line is in tension. With other forms, a choker cable may be looped onto itself and fastened with an appropriate connection. The loop is then fitted through a hook or other releasable engagement apparatus provided on the choker hook.
When choker chains are used, it is not uncommon to pro-vide a "keyhole grab" intermediate the chain and the choker hook. In some situations both chains and cables are used, or 77~8 it at least becomes a desirable feature to be able to inter-change chains or cables while utilizing the same choker hook.
The difficulty comes in providing a hook that will adequately receive a keyhole grab and that will also mount a cable hook without kinking and destructively stressing the cable. The bend radius about the hook is usually relatively small, resulting in a kink of the cable when tension cables wear and break frequently at the loop area while the remainder of the cable remains usable.
It therefore becomes desirable to obtain some form of choker hook that may be utilized either with choker chains or cables and that will protect cables against damage from kinking and wear by friction.
A preferred form of the present invention is illus-trated in the accompanying drawings in which:
Fig. 1 is an elevational side view of the present log choker hook;
Fig. 2 is a view as seen from the left in Fig. 1 only showing a portion of one of the bifurcations broken away;
Fig. 3 is a detailed view of the pin for my choker hook;
Fig. 4 is an operational view showing the choker hook in conjunction with a choker cable; and Fig. 5 is a view similar to Fig. 4 only showing opera-tion of the present choker hook with a keyhole grab and a choker chain.
The choker hook embodying a preferred form of the present invention is designated in the drawiny by the reference character 10. The present choker hook 10 is intended to be utilized along the length of a ~inch line 11 such as that partially shown by Figs 4 and 5. The end of the winch line typically includes a swaged ferrule 12 which prevents the choker 1~377~
hook from sliding off of the winch line.
The choker hook 10 is designed to releasably mount either a choker cab]e 13 or a choker chain 16. The cable 13 includes a loop 14 formed along its length and held in place by a connection 15. The chain 16 is provided with a "keyhole grab" 17. The keyhole grab typically includes a circular section 18 that leads into a narrow slot 19 for receiving and locking a chain link in place.
Specific details of the present choker hook 10 may best be seen with reference to Figs. 1 and 3. There it may be seen that the choker hook 10 is comprised of an elongated rigid body 2~. The body 20 includes a transverse opening 23 (Fig.2) through which the winch line 11 may be slideably received. It is preferred that the opening 23 be flared at both ends to pro-vide a smooth surface for sliding over the winchline without gouging or otherwise damaging the winchline. The body 20 also includes longitudinally projecting bifurcations 26.
The bifurcations 26 define an open recess 27 which may receive either the choker cable loop 14 or the keyhole grab 17.
The recess extends from an upper closed end 28 that is adjacent to the opening 23 to an open end defined by ends 30 of the bi-furcations 26. The recess 2? extends through the body sub-stantially parallel with the transverse opening 23.
An aperture 31 is formed through one of the bifurca-tions 26. It extends through the bifurcation in a direction trar;sverse to the opening 23. A threaded aperture 32 is formed through the remaining bifurcation and is axially aligned with the first aperture 31. The apertures are aligned along an axis that is perpendicular to opposite parallel side surfaces 33 of the body 21 and to the opening 23.
The apertures 31 and 32 are designed to receive a pin 34 that is shown in detail by Fig. 3. The pin 34 includes a 1~77~8 threaded end 35 that may be threadably received within aperture 32. The shank 36 of pin 34 is slideably received through the aperture 31 and is formed of a smooth cylindrical surface. Opposite the threaded end 35 is a headed end 39. End 39 includes a shoulder 37 that is of a dimension substantially larger than the aperture 31. A bolthead 38 projects outwardly from the shoulder 37. The bolthead is shown as being rect-angular so it may be utilized as a handhold for the choker setter or may also be turned by an appropriate wrench.
The cylindrical shank 36 of the pin 34 may be utilized to releasably receive a sheave 41. The sheave 41 includes a central bore 42 of a diameter slightly greater than the diameter of the end shank to facilitate free rotation thereon. Sheave 41 also includes a peripheral groove 43 that is complementary to the cross-sectional configuration of the type of cable being utilized.
The pin 34 and sheave 41 are easily attached and re-moved from the body. The sheave 41 may be inserted into the recess to a position in alignment with the apertures 31 and 32.
The pin is then inserted through the successive apertures 31, 42 and threaded into aperture 32 to rotatably secure the sheave within the recess. Removal of the sheave is accomplished by re-versing the steps described above.
In order to connect the present choker hook to a choker chain 16, the choker setter first removes the pin and sheave 41 from the body 21 by threadably disengaging the pin from threaded aperture 32 and pulling it axially from the sheave bore and aperture 31. He may then pocket the sheave or otherwise store it for future use when a choker cable is to be utilized. The circular section 18 of the keyhole yrab 17 can then be ins~rted within the recess 27 to a position between the closed end 28 and apertures 31 and 32. The pin is then reinserted and thread-77~
ably tightened within the aperture 32 to lock both itselfand the keyhole grab in place on the hook 10. The choker chain can then be connected and disconnected in the usual manner.
When looped choker cables 13 are utilized, the choker setter will first unassemble the hook as described above. He may then place the loop 14 over the loose sheave 41 so the cable is engaged within the groove 43. He then inserts the sheave and loop into the recess 27. The sheave 41 is positioned with its bore in alignment with apertures 30 and 31. Then the pin is placed through the apertures and is threadably secured.
The sheave 41 is designed and may be produced for use in conjunction with different forms of cable, its diameter can be selected to match the cross-sectional diameter of the cable being used. Therefore, there is no chance that the cable loop will kink or rub frictionally against any part of the hook 10 while it is under tension. The correct diameter of the sheave insures that the cable strands will not be excessively stressed during operation~
The above description was given to set fo:rth a preferred example of the present invention. It was not intended to restrict the scope of my invention which is set forth only by the following claim.
Claims
1. A log choker hook comprising:
a rigid elongated body having a transverse cross sectionally enclosed opening therein for slidably receiving a winch line;
said body including two longitudinal bifurcations that are transversely spaced to define an open recess within said rigid body extending longitudinally from a closed end adjacent the transverse opening to outward ends of the bifurca-tions;
a first aperture extending transversely through one of the bifurcations adjacent its outward end having a prescribed diameter;
a threaded aperture having a diameter less than the diameter of the first aperture and extending through the remaining bifurcation in axial alignment with the aperture formed through the one bifurcation;
a pin member having a diameter intermediate the diameter of the first aperture and threaded aperture loosely receivable through the first aperture and having a threaded end for thread-able engagement with the threaded aperture;
said pin having a first shoulder adjacent the threaded end for engaging the remaining bifurcation and limiting the penetration of the threaded end into the threaded aperture and to releasably secure the threaded end to the remaining bifurcation;
said pin having a headed end opposite the threaded end;
a shoulder at the headed end of the pin for preventing the headed end from passing through the first aperture;
a bolthead on the pin located outward of the shoulder;
and a sleeve loosely receivable within the recess and removably mountable to said pin for free rotation within the recess.
a rigid elongated body having a transverse cross sectionally enclosed opening therein for slidably receiving a winch line;
said body including two longitudinal bifurcations that are transversely spaced to define an open recess within said rigid body extending longitudinally from a closed end adjacent the transverse opening to outward ends of the bifurca-tions;
a first aperture extending transversely through one of the bifurcations adjacent its outward end having a prescribed diameter;
a threaded aperture having a diameter less than the diameter of the first aperture and extending through the remaining bifurcation in axial alignment with the aperture formed through the one bifurcation;
a pin member having a diameter intermediate the diameter of the first aperture and threaded aperture loosely receivable through the first aperture and having a threaded end for thread-able engagement with the threaded aperture;
said pin having a first shoulder adjacent the threaded end for engaging the remaining bifurcation and limiting the penetration of the threaded end into the threaded aperture and to releasably secure the threaded end to the remaining bifurcation;
said pin having a headed end opposite the threaded end;
a shoulder at the headed end of the pin for preventing the headed end from passing through the first aperture;
a bolthead on the pin located outward of the shoulder;
and a sleeve loosely receivable within the recess and removably mountable to said pin for free rotation within the recess.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US97053078A | 1978-12-18 | 1978-12-18 | |
| US970,530 | 1978-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1107788A true CA1107788A (en) | 1981-08-25 |
Family
ID=25517096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA341,606A Expired CA1107788A (en) | 1978-12-18 | 1979-12-11 | Log choker hood |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1107788A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5595411A (en) * | 1995-04-26 | 1997-01-21 | Delisle; Real | Accessories for log hauling apparatus |
| WO2009132400A1 (en) * | 2008-05-02 | 2009-11-05 | Innovative Construction Techniques Pty Ltd | An attachment apparatus for a choker chain |
| CN103588083A (en) * | 2013-11-16 | 2014-02-19 | 无锡中地地质装备有限公司 | Lifting ring of fisher |
| EP3070369A1 (en) * | 2015-03-20 | 2016-09-21 | Schilter Seilbahn- und Metallbau GmbH | Line slip ring, in particular choker ring |
-
1979
- 1979-12-11 CA CA341,606A patent/CA1107788A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5595411A (en) * | 1995-04-26 | 1997-01-21 | Delisle; Real | Accessories for log hauling apparatus |
| WO2009132400A1 (en) * | 2008-05-02 | 2009-11-05 | Innovative Construction Techniques Pty Ltd | An attachment apparatus for a choker chain |
| CN103588083A (en) * | 2013-11-16 | 2014-02-19 | 无锡中地地质装备有限公司 | Lifting ring of fisher |
| EP3070369A1 (en) * | 2015-03-20 | 2016-09-21 | Schilter Seilbahn- und Metallbau GmbH | Line slip ring, in particular choker ring |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |