CA1106421A - Butt hook for a logging choker line - Google Patents
Butt hook for a logging choker lineInfo
- Publication number
- CA1106421A CA1106421A CA338,556A CA338556A CA1106421A CA 1106421 A CA1106421 A CA 1106421A CA 338556 A CA338556 A CA 338556A CA 1106421 A CA1106421 A CA 1106421A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- main body
- ferrule
- butt hook
- line
- 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
Landscapes
- Load-Engaging Elements For Cranes (AREA)
Abstract
Abstract A butt hook having a main body defining a laterally open cavity within which is received a choker line ferrule.
A sleeve on the main body is positionable therealong to open and close the cavity for release and retention of the ferrule. A winchline receiving, removable shackle on the main body confines the sleeve against opening movement to assure ferrule and choker line retention. The shackle is of the type manually removable enabling choker line detachment and replacement without the aid of tools. A
modified form of butt hook utilizes a sleeve of reduced length slidably mounted on the main body to open and close a ferrule receiving cavity. A key on the main body pre-vents axial movement of the sleeve until a keyway in the sleeve is rotated into alignment with the key to permit axial sleeve movement.
A sleeve on the main body is positionable therealong to open and close the cavity for release and retention of the ferrule. A winchline receiving, removable shackle on the main body confines the sleeve against opening movement to assure ferrule and choker line retention. The shackle is of the type manually removable enabling choker line detachment and replacement without the aid of tools. A
modified form of butt hook utilizes a sleeve of reduced length slidably mounted on the main body to open and close a ferrule receiving cavity. A key on the main body pre-vents axial movement of the sleeve until a keyway in the sleeve is rotated into alignment with the key to permit axial sleeve movement.
Description
1~5~
The present invention concerns rigging for logging operations and particularly a butt hook ~or receiving the ferrule equipped leading end of a log engaging choker line.
A choker line or cable is typically passPd about an end segment of a felled log for purposes of transporting same to a site whereat the logs collected are loaded for travel to a mill or storage area, The log encompassing end of the line is fitted with a ferrule for removable securement within a choker hook with the line pas~ing about the log, back through the choker hook and thence upwardly to a butt hook. ~he butt hook may travel off the ground as in a high lead logging operation, or in the case of log skiddin~, may be pulled over the terrain. The choker line is also ferrule equipped at the butt hook attaching end enabling convenient removal for line replacement or reversal as is often necessary by reason of kinked or damaged cables.
In logging operations butt hooks are subjected to severe impacts particularly when in an unloaded or slacked condition during dragging back to the log pick up site.
Random bouncing o~ the butt hook can cause unseatin~ of the choker ferrule therein with resultant choker los-c.
U. S. Patent 3,464,093 was directed toward overcoming this problem and envisioned the use of flexible projec-tions to confine the ferrule against all but intentional removal.
Ideally a ferrule should be positively locked in placa within a butt hook yet readily removable for choker line reve~sal or replacement. ~o such butt hook ha~ been hereto~ore available which entirely qatis~ie3 these requirement~. Further, known butt hooks for high lead : ~
11~J ~
logging have not been interchangeable with butt hooks used in a log s~idding operation.
m e present invention is embodied within a butt hook receiving a choker ferrule in a positlvely locked manner as opposed to known one piece cast butt hooks. The present butt hook includes a main body portion of elongate config-uration having a cavity for lateral insertion and removal of the choker attached ferrule. A sleeve encompas~es sa~d hook body to retain the ferrule in place yet permits fer-rule and hence choker detachment in an expeditious mannerupon sleeve repositioning. Said sleeve is held against movement relative the hook body by attachment means shown and described as a shackle while sleeve movement in an opposite direction is prevented by contact with the hook body. The base portion o~ the hook body has a radially dlrected slot for reception of that segment of the cable adjacent the ferrule.
A modified form of the invention $ncludes the fore-going structure and additionally the main body of the hook ~s provided with locking means preventing accidental ferrule rele~sing mo~ement of the sleeve in an axial direction during hook u~e.
The butt hook embod~ing the present invention may be advantageously used in different types of logging opera-tions, for exa~ple, high lead logging or log skidding opcrations and in both instances serves to removably attach the leadin~ end of a choker line with a winchline or winchline suspended components. As above noted, butt heoks are subjected to severe impacts against trees, logs, stumps" etc.; during use with the choker ferrule held therein being subject to dislodgment particularly during return of a rapidly moving, unloaded butt hook to the log pick up site. Accordingly, it is highly desirable to pro-vide a butt hook which positively locks the ferrule in place therewithin yet permits a worker, at the log pick up site, to remove same and the choker line with no or a min-imum of tools ~or choker replacement or reversal as oftimes becomes necessary by reason of kinked cable segment~.
m e present invention i8 embodied within a butt hook for reception of a choker line ferrule, said butt hook sqrving to couple the log engaged choker l$ne to a winch retrieved line, said butt hook comprising, a main body defining a laterally opening cavity for reception of the choker ltne ferrule, said main body also defining a radially directed opening at one end for lateral passage of that por-tion of the chok~r line adjacent the ferrule, a sleeve on said main body and adapted for limited axial movement therealong to open and close said cavity, shackle means re~ovably attached to the remaining ~nd of said main body and adapted to receive the winch retrieved line, said shackle means having alig~ed ends proximate a sleeve end and normally preventing cavity opening movemen$ of said sl~eve in one direction, said main body restricting sleeve : movem~nt in an opposite direction, and said sleeve axially po~itionable upon removal of sa~d shackle means from said body to provide ingress and egress of the ferrule.
In the accompanying drawings: :
Figure 1 i~ an eleYational view of the present butt :~ hook in use suspended from a winchline of logging rigging, Figure 2 i5 an elevational view of the butt hook on a~ reduced scale with the sleeve thereGf broken away along a sleeve radial plane ~or purposes o illustrat~on;
. : ~ . -;
Figure 3 is a view similar to Figure 2 with the butt hook rotated th~ough 90 degrees and with fra~ments of the sleeve and main bo~y broken away for purposes of illu~tra-tion;
Figure 4 is a plan view of a log skidding operation utilizing the present butt hook;
Figure S is a side elevational view of the upper end of the pre~ent butt hook provided with a shackle adapted for use in a log skidding ope.ration;
~igure 6 is an elevational ~iew of a modified form of butt hoo~ including sleeve locking means in place on the main body of the butt hoo~.
With continuing attention to the accompanying drawings, the reference numeral 1 indicates the in-haul winchline of logging rigging which includes a line 2 reversed about a block (not shown) or return and attachment to in-haul line 1 and ~pecifically mainline swivels thereon indicated at 3.
Each main lina 5wivel 3 and its butt hook swivel indicated at 4 are interconnected by a bu~t chain 5 while a second section of chain 6 extends ~rom the butt swivel for butt hook attachment. The unseen right hand ends of lines 1 and 2 are wound about a powered drum or drums of a yaxder.
me foregoin~ is inkended to describe a typical high lead logging operation with which the present hook is usable but not rastrictively so.
The present butt hook i~ indicated ~enerally at 10 shown carrying one end of a conventional chokex line 11 typically fitted with a ferrule in place within the butt hook. The remaining end of the choker line passes about a log end with a second end mounted fexrule being inserted within a choker hook at 12. Such choker hooks are config-- . . - . ~
~1~6~
ured so as to retain the ferrule while pexmitting passage ~f the choker lin~ as the line is snugged about the log during log retrieval.
With particular attention to Figures 2 and 3, a main body 13 of the butt hook is of elongate configuration terminating upwardly in a projection 14 apertured at 14A
for the reception of a shackle bolt 15.
A cavity at 16 i5 formed within the lower portion of main body 13 with internal body wall surfaces defining the laterally directed cavity. Said ca~ity i~ of a height and width to receive a ferrule 17 secured to the leading end of choker line 11. A lowermost portion 13A o~ the main body defines a laterally directed opening 18 which terminates inwardly in coaxial relationship with cavity 16~ As best shown in Figure 2, an internal rounded shoulder 19 is formed on a radius complementary to that radius of a ferrule end indicated at 17A. Accordingly, ferrule 17 is supported against all cable exerted loads.
Cavity 16 is formed so as to locate ferrule 17 concentric with the ma~or axis of the main body, Disposed on main body 13 is a sleeve 20 having an inner wall surface 20A the sleeve being in sliding con-tact with the exterior of the main body. An end 20~ of ~he sleeve contacts the lowermo~t portion 13A of the main body to restrict sleeve movement in one direction.
A shackle at 21 constituting attachment means is attached to projection 14 by shackl~ ~o~t 15 with shackle end~ 21A-21~ serving to confine sleeve 20 against axial movement in the remaining direction. Bolt 15 is in threaded engagement with shackle end 21B so as to be retained against shackle separation. If so de~iredf 64;~1 shackle bolt 15 may xeceive a self-locking nut i~ which instance threading of shackle end 21B is dispensed with.
In either case shackle bolt 15 may be easily removed, such an operation reql~iring at most a wrench and, in the first described arrangement, being manually removable if finger tightened.
For reten*ion o choker line 11 and its ferrule 17 substantially concentric with main body 13, a spacer 22 is confined intermediate the ferrule end internal sleeve surface 20A.
With attention now to Figure 4, a typical log skidding operation is disclosed in plan view wherein a winchline 25 is powered by a tractor mounted winch 25 the latter having an elevated airlead so as to customarily elevate the forwardmost ends of the logs being skidded ground obstruc-tion avoidance. A ferrule 27 on the winchline end serves as a stop against which the shackle of a butt hook and ~uccessive butt ho~ks may he retained during log skidding.
Choker lines are indicated at 30 terminating outwardly in attachment with choker hooks 31 in the above described manner~ The present butt hook is indicated generally at :
10' and corresponds to the butt hook earlier described but which prefera~ly includes a somewhat modified shackle 33 as besk shown in Figure 5. Remaining butt hook parts are identified with like prime reference numerals. For purposes of avoiding damage to winchline 25, the shackle 33 is formed with a bail 34 of oval cross section pro-vidin~ an increased surface 34A. The foregoing is advan-~ageous in a log skidding operation by reason, of the fsct that the winchline passing through the butt hook shscXles is subjected to fraying by severe loads axerted in opposite directions wlthin a short distance. The increased surface area 3AA of the shackle is de~irable by reason of such loads being borne by a lar~er surface area than ~ould occur with a conventional shackleO
A modified foxm of butt hook is shown in Figure 6 and includes a main body 35 having an upward projection 36 for reception of a shackle attaching bolt 37 passing through shackle ends 38 to receive a nut 39. Main body 35 defines a ferrule receiving cavity 40 of the size and lQ configuration earlier described in the first form of the invention. A ferrule 41 is retained within cavi~y 40 by a ~leeve 42 of reduced length attached for limited sliding movement along main body 35. Remaining butt hook structure is as earlier set forth with differences noted as follows~
Locking means indica~ed at 43 comprises a key secured within a main body recess 44 as by set screws 45. Sleeve 42 includes a lengthwise extending keyway or channel 46 of a sectional area adequate to slidably receive key 43 when aligned tharewith. During a logging operation sleeve 42 gravitates toward the lowermost end 35A of the main body to confine ~errule 41 within cavity 4~. Inadvertent al~ gnment of sleeve channel 46 with key 43 coincident with sleeve upward movement is vir~ually non-existent to pre-clude accidental choker line separation. In this form of the invention, the shackle need not be removed fox ferrule removal. Only upon aligrlment of channel 46 with key 43 and careful en~agement of the ~leeve with 3aid insert can cavity 40 be opened for ferrule release.
Use of the pre~ent butt hook is believed obvious from the fore~oing description.
The present invention concerns rigging for logging operations and particularly a butt hook ~or receiving the ferrule equipped leading end of a log engaging choker line.
A choker line or cable is typically passPd about an end segment of a felled log for purposes of transporting same to a site whereat the logs collected are loaded for travel to a mill or storage area, The log encompassing end of the line is fitted with a ferrule for removable securement within a choker hook with the line pas~ing about the log, back through the choker hook and thence upwardly to a butt hook. ~he butt hook may travel off the ground as in a high lead logging operation, or in the case of log skiddin~, may be pulled over the terrain. The choker line is also ferrule equipped at the butt hook attaching end enabling convenient removal for line replacement or reversal as is often necessary by reason of kinked or damaged cables.
In logging operations butt hooks are subjected to severe impacts particularly when in an unloaded or slacked condition during dragging back to the log pick up site.
Random bouncing o~ the butt hook can cause unseatin~ of the choker ferrule therein with resultant choker los-c.
U. S. Patent 3,464,093 was directed toward overcoming this problem and envisioned the use of flexible projec-tions to confine the ferrule against all but intentional removal.
Ideally a ferrule should be positively locked in placa within a butt hook yet readily removable for choker line reve~sal or replacement. ~o such butt hook ha~ been hereto~ore available which entirely qatis~ie3 these requirement~. Further, known butt hooks for high lead : ~
11~J ~
logging have not been interchangeable with butt hooks used in a log s~idding operation.
m e present invention is embodied within a butt hook receiving a choker ferrule in a positlvely locked manner as opposed to known one piece cast butt hooks. The present butt hook includes a main body portion of elongate config-uration having a cavity for lateral insertion and removal of the choker attached ferrule. A sleeve encompas~es sa~d hook body to retain the ferrule in place yet permits fer-rule and hence choker detachment in an expeditious mannerupon sleeve repositioning. Said sleeve is held against movement relative the hook body by attachment means shown and described as a shackle while sleeve movement in an opposite direction is prevented by contact with the hook body. The base portion o~ the hook body has a radially dlrected slot for reception of that segment of the cable adjacent the ferrule.
A modified form of the invention $ncludes the fore-going structure and additionally the main body of the hook ~s provided with locking means preventing accidental ferrule rele~sing mo~ement of the sleeve in an axial direction during hook u~e.
The butt hook embod~ing the present invention may be advantageously used in different types of logging opera-tions, for exa~ple, high lead logging or log skidding opcrations and in both instances serves to removably attach the leadin~ end of a choker line with a winchline or winchline suspended components. As above noted, butt heoks are subjected to severe impacts against trees, logs, stumps" etc.; during use with the choker ferrule held therein being subject to dislodgment particularly during return of a rapidly moving, unloaded butt hook to the log pick up site. Accordingly, it is highly desirable to pro-vide a butt hook which positively locks the ferrule in place therewithin yet permits a worker, at the log pick up site, to remove same and the choker line with no or a min-imum of tools ~or choker replacement or reversal as oftimes becomes necessary by reason of kinked cable segment~.
m e present invention i8 embodied within a butt hook for reception of a choker line ferrule, said butt hook sqrving to couple the log engaged choker l$ne to a winch retrieved line, said butt hook comprising, a main body defining a laterally opening cavity for reception of the choker ltne ferrule, said main body also defining a radially directed opening at one end for lateral passage of that por-tion of the chok~r line adjacent the ferrule, a sleeve on said main body and adapted for limited axial movement therealong to open and close said cavity, shackle means re~ovably attached to the remaining ~nd of said main body and adapted to receive the winch retrieved line, said shackle means having alig~ed ends proximate a sleeve end and normally preventing cavity opening movemen$ of said sl~eve in one direction, said main body restricting sleeve : movem~nt in an opposite direction, and said sleeve axially po~itionable upon removal of sa~d shackle means from said body to provide ingress and egress of the ferrule.
In the accompanying drawings: :
Figure 1 i~ an eleYational view of the present butt :~ hook in use suspended from a winchline of logging rigging, Figure 2 i5 an elevational view of the butt hook on a~ reduced scale with the sleeve thereGf broken away along a sleeve radial plane ~or purposes o illustrat~on;
. : ~ . -;
Figure 3 is a view similar to Figure 2 with the butt hook rotated th~ough 90 degrees and with fra~ments of the sleeve and main bo~y broken away for purposes of illu~tra-tion;
Figure 4 is a plan view of a log skidding operation utilizing the present butt hook;
Figure S is a side elevational view of the upper end of the pre~ent butt hook provided with a shackle adapted for use in a log skidding ope.ration;
~igure 6 is an elevational ~iew of a modified form of butt hoo~ including sleeve locking means in place on the main body of the butt hoo~.
With continuing attention to the accompanying drawings, the reference numeral 1 indicates the in-haul winchline of logging rigging which includes a line 2 reversed about a block (not shown) or return and attachment to in-haul line 1 and ~pecifically mainline swivels thereon indicated at 3.
Each main lina 5wivel 3 and its butt hook swivel indicated at 4 are interconnected by a bu~t chain 5 while a second section of chain 6 extends ~rom the butt swivel for butt hook attachment. The unseen right hand ends of lines 1 and 2 are wound about a powered drum or drums of a yaxder.
me foregoin~ is inkended to describe a typical high lead logging operation with which the present hook is usable but not rastrictively so.
The present butt hook i~ indicated ~enerally at 10 shown carrying one end of a conventional chokex line 11 typically fitted with a ferrule in place within the butt hook. The remaining end of the choker line passes about a log end with a second end mounted fexrule being inserted within a choker hook at 12. Such choker hooks are config-- . . - . ~
~1~6~
ured so as to retain the ferrule while pexmitting passage ~f the choker lin~ as the line is snugged about the log during log retrieval.
With particular attention to Figures 2 and 3, a main body 13 of the butt hook is of elongate configuration terminating upwardly in a projection 14 apertured at 14A
for the reception of a shackle bolt 15.
A cavity at 16 i5 formed within the lower portion of main body 13 with internal body wall surfaces defining the laterally directed cavity. Said ca~ity i~ of a height and width to receive a ferrule 17 secured to the leading end of choker line 11. A lowermost portion 13A o~ the main body defines a laterally directed opening 18 which terminates inwardly in coaxial relationship with cavity 16~ As best shown in Figure 2, an internal rounded shoulder 19 is formed on a radius complementary to that radius of a ferrule end indicated at 17A. Accordingly, ferrule 17 is supported against all cable exerted loads.
Cavity 16 is formed so as to locate ferrule 17 concentric with the ma~or axis of the main body, Disposed on main body 13 is a sleeve 20 having an inner wall surface 20A the sleeve being in sliding con-tact with the exterior of the main body. An end 20~ of ~he sleeve contacts the lowermo~t portion 13A of the main body to restrict sleeve movement in one direction.
A shackle at 21 constituting attachment means is attached to projection 14 by shackl~ ~o~t 15 with shackle end~ 21A-21~ serving to confine sleeve 20 against axial movement in the remaining direction. Bolt 15 is in threaded engagement with shackle end 21B so as to be retained against shackle separation. If so de~iredf 64;~1 shackle bolt 15 may xeceive a self-locking nut i~ which instance threading of shackle end 21B is dispensed with.
In either case shackle bolt 15 may be easily removed, such an operation reql~iring at most a wrench and, in the first described arrangement, being manually removable if finger tightened.
For reten*ion o choker line 11 and its ferrule 17 substantially concentric with main body 13, a spacer 22 is confined intermediate the ferrule end internal sleeve surface 20A.
With attention now to Figure 4, a typical log skidding operation is disclosed in plan view wherein a winchline 25 is powered by a tractor mounted winch 25 the latter having an elevated airlead so as to customarily elevate the forwardmost ends of the logs being skidded ground obstruc-tion avoidance. A ferrule 27 on the winchline end serves as a stop against which the shackle of a butt hook and ~uccessive butt ho~ks may he retained during log skidding.
Choker lines are indicated at 30 terminating outwardly in attachment with choker hooks 31 in the above described manner~ The present butt hook is indicated generally at :
10' and corresponds to the butt hook earlier described but which prefera~ly includes a somewhat modified shackle 33 as besk shown in Figure 5. Remaining butt hook parts are identified with like prime reference numerals. For purposes of avoiding damage to winchline 25, the shackle 33 is formed with a bail 34 of oval cross section pro-vidin~ an increased surface 34A. The foregoing is advan-~ageous in a log skidding operation by reason, of the fsct that the winchline passing through the butt hook shscXles is subjected to fraying by severe loads axerted in opposite directions wlthin a short distance. The increased surface area 3AA of the shackle is de~irable by reason of such loads being borne by a lar~er surface area than ~ould occur with a conventional shackleO
A modified foxm of butt hook is shown in Figure 6 and includes a main body 35 having an upward projection 36 for reception of a shackle attaching bolt 37 passing through shackle ends 38 to receive a nut 39. Main body 35 defines a ferrule receiving cavity 40 of the size and lQ configuration earlier described in the first form of the invention. A ferrule 41 is retained within cavi~y 40 by a ~leeve 42 of reduced length attached for limited sliding movement along main body 35. Remaining butt hook structure is as earlier set forth with differences noted as follows~
Locking means indica~ed at 43 comprises a key secured within a main body recess 44 as by set screws 45. Sleeve 42 includes a lengthwise extending keyway or channel 46 of a sectional area adequate to slidably receive key 43 when aligned tharewith. During a logging operation sleeve 42 gravitates toward the lowermost end 35A of the main body to confine ~errule 41 within cavity 4~. Inadvertent al~ gnment of sleeve channel 46 with key 43 coincident with sleeve upward movement is vir~ually non-existent to pre-clude accidental choker line separation. In this form of the invention, the shackle need not be removed fox ferrule removal. Only upon aligrlment of channel 46 with key 43 and careful en~agement of the ~leeve with 3aid insert can cavity 40 be opened for ferrule release.
Use of the pre~ent butt hook is believed obvious from the fore~oing description.
Claims
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
A butt hook for reception of a choker line ferrule, said butt hook serving to couple the log engaged choker line to a winch retrieved line, said butt hook comprising, a main body defining a laterally opening cavity for reception of the choker line ferrule, said main body also defining a radially directed opening at one end for lateral passage of that portion of the choker line adjacent the ferrule, a sleeve on said main body and adapted for limited axial movement therealong to open and close said cavity, shackle means removably attached to the remaining end of said main body and adapted to receive the winch retrieved line, said shackle means having aligned ends proximate a sleeve end, said aligned ends limiting movement of said sleeve in one direction, said main body limiting sleeve movement in an opposite direction, and said sleeve axially positionable upon removal of said shackle means from said body to provide ingress and egress of the ferrule.
The butt hook claimed in claim 1 additionally includ-ing a spacer interposed between the ferrule and said sleeve.
A butt hook for reception of a choker line ferrule, said butt hook serving to couple the choker line to a winch retrieved line, said butt hook comprising, a main body defining a laterally opening cavity for reception of the choker line ferrule, said body also defining a radially directed opening for lateral passage of that portion of the choker line adjacent the ferrule, a sleeve on said main body and adapted for rotational positioning about said main body and for limited axial movement therealong to open and close said cavity, said sleeve having an internal channel formed therealong, said main body restricting sleeve movement in one direction, shackle means attached to said main body and adapted to receive the winch retrieved line, locking means on said main body normally projecting outwardly into the path of said sleeve to confine same against cavity opening axial movement, said sleeve channel of a size permitting reception of the locking means upon alignment therewith allowing subsequent axial positioning of the sleeve to open said cavity, and said shackle means having aligned ends proximate a sleeve end to prevent sleeve cavity opening movement along said main body.
The butt hook claimed in claim 3 additionally includ-ing a spacer interposed between the ferrule and said sleeve.
A butt hook for reception of a choker line ferrule, said butt hook serving to couple the log engaged choker line to a winch retrieved line, said butt hook comprising, a main body defining a laterally opening cavity for reception of the choker line ferrule, said main body also defining a radially directed opening at one end for lateral passage of that portion of the choker line adjacent the ferrule, a sleeve on said main body and adapted for limited axial movement therealong to open and close said cavity, shackle means removably attached to the remaining end of said main body and adapted to receive the winch retrieved line, said shackle means having aligned ends proximate a sleeve end, said aligned ends limiting movement of said sleeve in one direction, said main body limiting sleeve movement in an opposite direction, and said sleeve axially positionable upon removal of said shackle means from said body to provide ingress and egress of the ferrule.
The butt hook claimed in claim 1 additionally includ-ing a spacer interposed between the ferrule and said sleeve.
A butt hook for reception of a choker line ferrule, said butt hook serving to couple the choker line to a winch retrieved line, said butt hook comprising, a main body defining a laterally opening cavity for reception of the choker line ferrule, said body also defining a radially directed opening for lateral passage of that portion of the choker line adjacent the ferrule, a sleeve on said main body and adapted for rotational positioning about said main body and for limited axial movement therealong to open and close said cavity, said sleeve having an internal channel formed therealong, said main body restricting sleeve movement in one direction, shackle means attached to said main body and adapted to receive the winch retrieved line, locking means on said main body normally projecting outwardly into the path of said sleeve to confine same against cavity opening axial movement, said sleeve channel of a size permitting reception of the locking means upon alignment therewith allowing subsequent axial positioning of the sleeve to open said cavity, and said shackle means having aligned ends proximate a sleeve end to prevent sleeve cavity opening movement along said main body.
The butt hook claimed in claim 3 additionally includ-ing a spacer interposed between the ferrule and said sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA338,556A CA1106421A (en) | 1979-10-26 | 1979-10-26 | Butt hook for a logging choker line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA338,556A CA1106421A (en) | 1979-10-26 | 1979-10-26 | Butt hook for a logging choker line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1106421A true CA1106421A (en) | 1981-08-04 |
Family
ID=4115450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA338,556A Expired CA1106421A (en) | 1979-10-26 | 1979-10-26 | Butt hook for a logging choker line |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1106421A (en) |
-
1979
- 1979-10-26 CA CA338,556A patent/CA1106421A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |