CA1148911A - Hinged mechanical rope grab - Google Patents
Hinged mechanical rope grabInfo
- Publication number
- CA1148911A CA1148911A CA000378982A CA378982A CA1148911A CA 1148911 A CA1148911 A CA 1148911A CA 000378982 A CA000378982 A CA 000378982A CA 378982 A CA378982 A CA 378982A CA 1148911 A CA1148911 A CA 1148911A
- Authority
- CA
- Canada
- Prior art keywords
- rope
- collar
- fingers
- throat
- distal
- 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
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B1/00—Devices for lowering persons from buildings or the like
- A62B1/06—Devices for lowering persons from buildings or the like by making use of rope-lowering devices
- A62B1/14—Devices for lowering persons from buildings or the like by making use of rope-lowering devices with brakes sliding on the rope
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Lowering Means (AREA)
Abstract
TITLE, HINGED MECHANICAL ROPE. GRAB
INVENTOR
Arthur J. LEDUC
ABSTRACT
The invention discloses an improved rope grabber for use with a life line rope and a lanyard where the life line rope is adapted to pass through the rope grabber to a worker, the safety device is attached between the life line and the worker. Particularily, the grabber includes two hingeable sections, a hingeable collar portion which allows the lifeline to be inserted into the collar and the collar snap shut to constrain the lifeline therein, and a hingeable attachment means in the form of an annulus which pivots to open the throat region whereby the lifeline can be inserted into the distal region of the throat region and the annulus is snapped shut so as to confine the lifeline therein.
INVENTOR
Arthur J. LEDUC
ABSTRACT
The invention discloses an improved rope grabber for use with a life line rope and a lanyard where the life line rope is adapted to pass through the rope grabber to a worker, the safety device is attached between the life line and the worker. Particularily, the grabber includes two hingeable sections, a hingeable collar portion which allows the lifeline to be inserted into the collar and the collar snap shut to constrain the lifeline therein, and a hingeable attachment means in the form of an annulus which pivots to open the throat region whereby the lifeline can be inserted into the distal region of the throat region and the annulus is snapped shut so as to confine the lifeline therein.
Description
` 1148911 This invention relates to a safety device for workmen when working with safety belts, lanyards and lifelines.
In my Canadian Patent 1,028,124 issued 21 March, 1978 entitled A MECIIANICAL ROP~ Gr~B I disclosed a safety device for use with lanyards and lifelin~s and in particular a device to be used as an attachment to a 1ifeline to prevent a workman from-falling.
I have now conceived an improved rope grab with hinge which allows a lifeline to be slipped into the collar. To accommodate this, the collar is formed of half segments, relatively hinged and fixably engagable one segment with the other.
The invention also contemplates an attachment means for the improved rope grab that inhibits release, unintentionally, of a safety snap which is the device by which a lanyard is normally attached from the grabber to the safety belt of the wearer.
The invention thereore conl:emplates as an article o~
manufacturing, a ropè grab for USi' with a li~eline rope, and a lanyard line, wherein the lifeline rope is adapted to pass through the rope grab to a worker, and the lanyard is attached between the rope grab and the worker, the rope grab comprising:
(a) a collar member defining an axis;
(b) a jaw-like frame, defining a throat with distal and proximate regions, whereby the throat extends from the margin of the collar as two fingers, diverging from an intersection and medially bent in the same direction and with the respective distal ~nds of the fingers joined, ~ whereby the fingers define the throat, the distal throat region intersecting the prolongation of the axis and having a larger cross-sectional area than the proximate throat region, which is bound by the collar region and the proximate ends of the fingers;
(c) attachment means near the distal ends for attaching an end of the lanyard;
(d) the collar member formed as;
~, *
.. .
. : - ~ ~ . . . ' ' '' , :, . ,: ' ' ' " : ' .
~1~8911 (i) first and second omplimentary arcuate members fixedly attached to the fingers, the other hingedly attached to the first l:hrough;
(ii) means for pivoting the second relative to t:he first so as to swing open and to c:Lose the collar member, and (iii) means for constraining the second in closed juxtaposition with the first as to define the axis;
and, (e) whereby the lifeline is adapted to extend through the collar and the throat to assume a position relatively coincident to the axis and its prolongation through the throat, and hence extend through the distal throat region, but when tension is applied via the lanyard to the distal ends, the grabber pivots and wedges the lifeline rope between the fingers in the proximate throat region.
The invention will now l,e d~scribed by way of example and with reference to the accompanyin~ drawings in which Figure 1 is an elevated side of an embodiment of the invention.
Figure 2 is a back view of the embodiment of figure 1.
Figure 3 is a section along III-III of figure 1, the phantom position being an open collar position.
Figure 3A is a plan view of the clasp on the collar member.
Figure 4 is a section along lines IV-IV of figure 1 ~ith the~phantom pos~tlon~showing pivot means allowing one to nsert-the lifeline~in~the throat region.
Figure~5 is a section throu~h the clip pin of the attachment~means.
Figure 6 is a section along lines VI - VI of figure 1 showing in plan engagement of a safety clasp.
Referring to~figure 1 the improved grabber according to n~ly~lnve~ntion consists of almost identical or similar elements to~that disclos;ed in my aforesaid patent.
:' , . . ~ ' . :
~1~8911 Thus, referring to the figures of this application, l:he grabber 20 includes a pair of arcuately extending wedge shaped fingers 22 wherein approximate ends are affixed to a collar 23 that defines a longitudinal axis. This collar 23 is made of two arcuate segments 24. The segments 24 have a margin or hinge 25 with a hinge pin 26 extending therethrough and th:is pin.holds the two segments so thal: one of the segments, 24~, pivots relative to the other segment 24C. The proximate ends of the fingers therefore are unitarily attached to the segment 24C and to add strengh to this un:ion the collar segment 24C
extends into a protuberance at 27.
Referring to figure 3, an arcuate spring biased clasp 30, most simply constructed of spring steel material, has one end attached, as by a rivot 31, to an extremity of the segment 24H. The fixed segment 24C has a protuberance or stud 34 positioned on its outer surface. The clasp, 30 has an orifice 32, not clearly seen, which when the segments are in the closed juxapostion (solid position in figure 3) the stud 34 is placed into registry with the orifice 32 in the clasp and extends therethrough thus locking the two segments 24 toget:her so that the collar 23 is then constrained closed as shown in figures 1 and 2.
In a somewhat analogous fashion, the distal ends of the fingers 22 terminate at an interface from which is carried an attachment means in the form of an annulus 40. The fingers 22, a margin of the annulus 40 and collar 23 jointly define an elongated throat region 15. It i-; within this throat region 15 that a life line 12 extends to continue through the collar 23 ln the fashion as shown in figure 2.
~ The throat region 15 has a narrower proximate cross sectional area throat region 12P defined by the two fingers 22 and the collar 23, and a larger cross sectional area in the distal region 12D defined by the fingers 22 and the annulus 40. Thus, in the conventional manner a rope or lifeline 12 extends through the collar and typically through distal throat region 12D when the lifeline is not activated.
When activated, as described in my aforesaid patent, and -~ ;
.
. .
, 114L89~ 1 _ 4 referring to figure 2, the rope l,~ moves, in the path of the arow, and to be wedged in the proximate throat region 15P by the fingers 22.
The attachment means or annulus 40 is constructed as to define an aperture 45 into which a lanyard 6 can be engaged as most clearly seen in figure 6. Two marginal Elanges 46 and 47, which extend from it. The flanges 46 and 47 each define an aperture. The fingers 22 each, terminate, at their respected distal ends to define a slot, or recess 22S through which an aperture is formed. Each of the slo~s 22S matingly respectively accommodate, as more clearly seen in figure 4, the flanges 46 or 47, so that the respective apertures are in relative registry. A pivot pin 6() is secured through one of the pairs of apertures as through flange 46 and in this way the annulus 40 pivot from the distal end of finger 22L and thus swings from the solid to the phantom position as shown in figure 4. In this manner it exposes the throat region 15, and the rope 12 may be inserted thereln. In this way the rope end need not be threaded through the throat region. The annulus 40 is locked into the solid positlon of figures l, 2 and 4, by a sliding retaining pin generally shown as 50.
Referring to figure S this pin 50 includes a spherical head Sl and a shaft 52 with that has its end peened over at 53. The shaft 52 has a circumferential frusto conical recess at 54 so to accommodate a circular spring 55 which rests in an annular recess of the upper flange of the finger 22L. The circular spring 55 biases against the circumferential surface 54 in a manner which pushes the pin 50 into the solid retaining position of figure 5 so that the shaft 52 extends through the accommodating aperture of the flange 47.
When the annulus 40 is in the phantom position offigure 4 the interior of the throat region 15 is exposed and if a~
the same time the collar 23 is open by unlatching the clasp 30 as indicated in phantom in figure 3, the life line 12 may be simply inserted not threaded into the grabber in a manner which avoids actual threading of an end of the life line through the collar and throat region as is necessary in my ,.~, : ' , ' .
"' ' ' . -., .
' . ~ ' ' ~ , . ', ' :
~148911 earlier grabber.
Referring to figures 4 and 6 as an additional restraint feature for the clasp 60', the annulus 40 defines the aperture 45 as a circumscribing high collar. The annulus 40 is thus formed with a circumferential wall 49 which surmounts and extends from the walls of the actual aperture 45. At the base of the wall 49, the aperture defines a radially, inwardly ?
protruding circumscribing bead 44. The clasp 60' has a spring loaded articulating front closing member 65 which snaps, in a 10 conventional manner, to lock the clasp 60' over the wall 49 and integral bead 44, as clearly shown in figure 6, while allowing the frontal closing member 65 to extend freely through the aperture 45. The combined effect of the bead 44 and the circumferential uprising wall 49 is to constrain, in engagement, the safety clasp 60' about the aperture 45 perimeter; thus, about the bead 4~ and wall 49 so that the clasp 60' may not be accidentally maneuvered, as by twisting, into a position which causes the annulus to wedge against the frontal closing member 65 causing it to latch open and thus to 20 permit the clasp 60' to slip out of engagement with the aperture 45. Those skilled in the art will appreciate that this, in some instances, is a problem generally known as premature safety c~asp release. In part, therefore, the bead diameter of the bead 44, and the aperture wall height of wall 49, are judicially selected to give a combined horizontal and vertical dimension so that their combined capture area is large enough, relative to the inside open dimensional area of : :the clasp 60', so that irrespective of the orientation of the clasp 60', when it is in the snapped captured position ~hrough :~30 the aperture 45 of figure 6 as shown, unintentional forward pressure can not be placed on the closing member 65 so as to cause it to move into the phantom position shown in figure 6 and to permit premature or unintentional release of the clasp ; from engagement with the annulus. -i~ .
..
, . ' ', . ~',~ , - - , ' , .: . . .
In my Canadian Patent 1,028,124 issued 21 March, 1978 entitled A MECIIANICAL ROP~ Gr~B I disclosed a safety device for use with lanyards and lifelin~s and in particular a device to be used as an attachment to a 1ifeline to prevent a workman from-falling.
I have now conceived an improved rope grab with hinge which allows a lifeline to be slipped into the collar. To accommodate this, the collar is formed of half segments, relatively hinged and fixably engagable one segment with the other.
The invention also contemplates an attachment means for the improved rope grab that inhibits release, unintentionally, of a safety snap which is the device by which a lanyard is normally attached from the grabber to the safety belt of the wearer.
The invention thereore conl:emplates as an article o~
manufacturing, a ropè grab for USi' with a li~eline rope, and a lanyard line, wherein the lifeline rope is adapted to pass through the rope grab to a worker, and the lanyard is attached between the rope grab and the worker, the rope grab comprising:
(a) a collar member defining an axis;
(b) a jaw-like frame, defining a throat with distal and proximate regions, whereby the throat extends from the margin of the collar as two fingers, diverging from an intersection and medially bent in the same direction and with the respective distal ~nds of the fingers joined, ~ whereby the fingers define the throat, the distal throat region intersecting the prolongation of the axis and having a larger cross-sectional area than the proximate throat region, which is bound by the collar region and the proximate ends of the fingers;
(c) attachment means near the distal ends for attaching an end of the lanyard;
(d) the collar member formed as;
~, *
.. .
. : - ~ ~ . . . ' ' '' , :, . ,: ' ' ' " : ' .
~1~8911 (i) first and second omplimentary arcuate members fixedly attached to the fingers, the other hingedly attached to the first l:hrough;
(ii) means for pivoting the second relative to t:he first so as to swing open and to c:Lose the collar member, and (iii) means for constraining the second in closed juxtaposition with the first as to define the axis;
and, (e) whereby the lifeline is adapted to extend through the collar and the throat to assume a position relatively coincident to the axis and its prolongation through the throat, and hence extend through the distal throat region, but when tension is applied via the lanyard to the distal ends, the grabber pivots and wedges the lifeline rope between the fingers in the proximate throat region.
The invention will now l,e d~scribed by way of example and with reference to the accompanyin~ drawings in which Figure 1 is an elevated side of an embodiment of the invention.
Figure 2 is a back view of the embodiment of figure 1.
Figure 3 is a section along III-III of figure 1, the phantom position being an open collar position.
Figure 3A is a plan view of the clasp on the collar member.
Figure 4 is a section along lines IV-IV of figure 1 ~ith the~phantom pos~tlon~showing pivot means allowing one to nsert-the lifeline~in~the throat region.
Figure~5 is a section throu~h the clip pin of the attachment~means.
Figure 6 is a section along lines VI - VI of figure 1 showing in plan engagement of a safety clasp.
Referring to~figure 1 the improved grabber according to n~ly~lnve~ntion consists of almost identical or similar elements to~that disclos;ed in my aforesaid patent.
:' , . . ~ ' . :
~1~8911 Thus, referring to the figures of this application, l:he grabber 20 includes a pair of arcuately extending wedge shaped fingers 22 wherein approximate ends are affixed to a collar 23 that defines a longitudinal axis. This collar 23 is made of two arcuate segments 24. The segments 24 have a margin or hinge 25 with a hinge pin 26 extending therethrough and th:is pin.holds the two segments so thal: one of the segments, 24~, pivots relative to the other segment 24C. The proximate ends of the fingers therefore are unitarily attached to the segment 24C and to add strengh to this un:ion the collar segment 24C
extends into a protuberance at 27.
Referring to figure 3, an arcuate spring biased clasp 30, most simply constructed of spring steel material, has one end attached, as by a rivot 31, to an extremity of the segment 24H. The fixed segment 24C has a protuberance or stud 34 positioned on its outer surface. The clasp, 30 has an orifice 32, not clearly seen, which when the segments are in the closed juxapostion (solid position in figure 3) the stud 34 is placed into registry with the orifice 32 in the clasp and extends therethrough thus locking the two segments 24 toget:her so that the collar 23 is then constrained closed as shown in figures 1 and 2.
In a somewhat analogous fashion, the distal ends of the fingers 22 terminate at an interface from which is carried an attachment means in the form of an annulus 40. The fingers 22, a margin of the annulus 40 and collar 23 jointly define an elongated throat region 15. It i-; within this throat region 15 that a life line 12 extends to continue through the collar 23 ln the fashion as shown in figure 2.
~ The throat region 15 has a narrower proximate cross sectional area throat region 12P defined by the two fingers 22 and the collar 23, and a larger cross sectional area in the distal region 12D defined by the fingers 22 and the annulus 40. Thus, in the conventional manner a rope or lifeline 12 extends through the collar and typically through distal throat region 12D when the lifeline is not activated.
When activated, as described in my aforesaid patent, and -~ ;
.
. .
, 114L89~ 1 _ 4 referring to figure 2, the rope l,~ moves, in the path of the arow, and to be wedged in the proximate throat region 15P by the fingers 22.
The attachment means or annulus 40 is constructed as to define an aperture 45 into which a lanyard 6 can be engaged as most clearly seen in figure 6. Two marginal Elanges 46 and 47, which extend from it. The flanges 46 and 47 each define an aperture. The fingers 22 each, terminate, at their respected distal ends to define a slot, or recess 22S through which an aperture is formed. Each of the slo~s 22S matingly respectively accommodate, as more clearly seen in figure 4, the flanges 46 or 47, so that the respective apertures are in relative registry. A pivot pin 6() is secured through one of the pairs of apertures as through flange 46 and in this way the annulus 40 pivot from the distal end of finger 22L and thus swings from the solid to the phantom position as shown in figure 4. In this manner it exposes the throat region 15, and the rope 12 may be inserted thereln. In this way the rope end need not be threaded through the throat region. The annulus 40 is locked into the solid positlon of figures l, 2 and 4, by a sliding retaining pin generally shown as 50.
Referring to figure S this pin 50 includes a spherical head Sl and a shaft 52 with that has its end peened over at 53. The shaft 52 has a circumferential frusto conical recess at 54 so to accommodate a circular spring 55 which rests in an annular recess of the upper flange of the finger 22L. The circular spring 55 biases against the circumferential surface 54 in a manner which pushes the pin 50 into the solid retaining position of figure 5 so that the shaft 52 extends through the accommodating aperture of the flange 47.
When the annulus 40 is in the phantom position offigure 4 the interior of the throat region 15 is exposed and if a~
the same time the collar 23 is open by unlatching the clasp 30 as indicated in phantom in figure 3, the life line 12 may be simply inserted not threaded into the grabber in a manner which avoids actual threading of an end of the life line through the collar and throat region as is necessary in my ,.~, : ' , ' .
"' ' ' . -., .
' . ~ ' ' ~ , . ', ' :
~148911 earlier grabber.
Referring to figures 4 and 6 as an additional restraint feature for the clasp 60', the annulus 40 defines the aperture 45 as a circumscribing high collar. The annulus 40 is thus formed with a circumferential wall 49 which surmounts and extends from the walls of the actual aperture 45. At the base of the wall 49, the aperture defines a radially, inwardly ?
protruding circumscribing bead 44. The clasp 60' has a spring loaded articulating front closing member 65 which snaps, in a 10 conventional manner, to lock the clasp 60' over the wall 49 and integral bead 44, as clearly shown in figure 6, while allowing the frontal closing member 65 to extend freely through the aperture 45. The combined effect of the bead 44 and the circumferential uprising wall 49 is to constrain, in engagement, the safety clasp 60' about the aperture 45 perimeter; thus, about the bead 4~ and wall 49 so that the clasp 60' may not be accidentally maneuvered, as by twisting, into a position which causes the annulus to wedge against the frontal closing member 65 causing it to latch open and thus to 20 permit the clasp 60' to slip out of engagement with the aperture 45. Those skilled in the art will appreciate that this, in some instances, is a problem generally known as premature safety c~asp release. In part, therefore, the bead diameter of the bead 44, and the aperture wall height of wall 49, are judicially selected to give a combined horizontal and vertical dimension so that their combined capture area is large enough, relative to the inside open dimensional area of : :the clasp 60', so that irrespective of the orientation of the clasp 60', when it is in the snapped captured position ~hrough :~30 the aperture 45 of figure 6 as shown, unintentional forward pressure can not be placed on the closing member 65 so as to cause it to move into the phantom position shown in figure 6 and to permit premature or unintentional release of the clasp ; from engagement with the annulus. -i~ .
..
, . ' ', . ~',~ , - - , ' , .: . . .
Claims (5)
1. An article of manufacturing, a rope grab for use with a lifeline rope, and a lanyard line, wherein the lifeline rope is adapted to pass through the rope grab to a point above the worker, and the lanyard is attached between the rope grab and the worker, the rope grab comprising:
(a) a collar member defining an axis;
(b) a jaw-like frame, defining a throat with distal and proximate regions, whereby the throat extends from the margin of the collar as two fingers, diverging from an intersection and medially bent in the same direction and with the respective distal ends of the fingers joined, whereby the fingers define the throat, the distal throat region intersecting the prolongation of the axis and having a larger cross-sectional area than the proximate throat region, which is bound by the collar region and the proximate ends of the fingers;
(c) attachment means near the distal ends for attaching an end of the lanyard;
(d) the collar member formed as;
(i) first and second complimentary arcuate members, the first fixidly attached to the fingers, the other hingedly attached to the first through;
(ii) means for pivoting the second relative to the first so as to swing open and to close the collar member, and (iii) means for constraining the second in closed juxtaposition with the first as to define the axis; and, (e) whereby the lifeline is adapted to extend through the collar and the throat to assume a position relatively coincident to the axis and its prolongation through the throat, and hence extend through the distal throat region, but when tension is applied via the lanyard to the distal ends, the grabber pivots and wedges the lifeline rope between the fingers in the proximate throat region.
(a) a collar member defining an axis;
(b) a jaw-like frame, defining a throat with distal and proximate regions, whereby the throat extends from the margin of the collar as two fingers, diverging from an intersection and medially bent in the same direction and with the respective distal ends of the fingers joined, whereby the fingers define the throat, the distal throat region intersecting the prolongation of the axis and having a larger cross-sectional area than the proximate throat region, which is bound by the collar region and the proximate ends of the fingers;
(c) attachment means near the distal ends for attaching an end of the lanyard;
(d) the collar member formed as;
(i) first and second complimentary arcuate members, the first fixidly attached to the fingers, the other hingedly attached to the first through;
(ii) means for pivoting the second relative to the first so as to swing open and to close the collar member, and (iii) means for constraining the second in closed juxtaposition with the first as to define the axis; and, (e) whereby the lifeline is adapted to extend through the collar and the throat to assume a position relatively coincident to the axis and its prolongation through the throat, and hence extend through the distal throat region, but when tension is applied via the lanyard to the distal ends, the grabber pivots and wedges the lifeline rope between the fingers in the proximate throat region.
2. The grabber as claimed in claim 1 wherein the means (ii) of the collar member is a hinge.
3. The grabber as claimed in claim 1 wherein the means (iii) of the collar member is a spring clasp ridgedly affixed to one of the complimentary arcuate members, and disposing an aperture therein, and the other complimentary arcuate member has a protuberance, that mates and registers into the aperture in the clasp when the two complimentary arcuate members are in juxtaposition; thereby to constrain the collar closed.
4. The grabber as claimed in claim 1, 2 or 3 wherein the attachment means includes an annulus defining an aperture, the annulus extending as a circumferential wall with height of a predetermined distance.
5. The rope grabber as claimed in claim 3 including means for pivotly attaching the attachment means (c) to the distal end of one of the fingers and for removingly affixing, onto the distal end of the annulus, the other finger whereby the distal throat region is defined by a segment of the annulus and distal segments of the fingers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000378982A CA1148911A (en) | 1981-06-03 | 1981-06-03 | Hinged mechanical rope grab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000378982A CA1148911A (en) | 1981-06-03 | 1981-06-03 | Hinged mechanical rope grab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1148911A true CA1148911A (en) | 1983-06-28 |
Family
ID=4120137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000378982A Expired CA1148911A (en) | 1981-06-03 | 1981-06-03 | Hinged mechanical rope grab |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1148911A (en) |
-
1981
- 1981-06-03 CA CA000378982A patent/CA1148911A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |