CA1266240A - Safety stop for stopping non-level descent of vertically movable assembly - Google Patents
Safety stop for stopping non-level descent of vertically movable assemblyInfo
- Publication number
- CA1266240A CA1266240A CA000594037A CA594037A CA1266240A CA 1266240 A CA1266240 A CA 1266240A CA 000594037 A CA000594037 A CA 000594037A CA 594037 A CA594037 A CA 594037A CA 1266240 A CA1266240 A CA 1266240A
- Authority
- CA
- Canada
- Prior art keywords
- safety stop
- wedge
- assembly
- tracking
- locking
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/34—Devices for discharging articles or materials from conveyor
- B65G47/44—Arrangements or applications of hoppers or chutes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
- B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
- B66B5/22—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces by means of linearly-movable wedges
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Warehouses Or Storage Devices (AREA)
Abstract
SAEETY STOP FOR STOPPING NON-LEVEL
DESCENT OF VERTICALLY MOVABLE ASSEMBLY
ABSTRACT OF THE DISCLOSURE
A safety stop for stopping non-level descent of a vertically movable assembly. A wedge is mounted on the assembly for vertical movement therewith. A tracking member tracks movement of the wedge. A normally unlocked locking mechanism prevents vertical descent of the assembly when locked. A
coupling mechanism couples the tracking member to the locking mechanism. The tracking member moves in response to non-level descent of the assembly to shift the locking mechanism into its locked position.
DESCENT OF VERTICALLY MOVABLE ASSEMBLY
ABSTRACT OF THE DISCLOSURE
A safety stop for stopping non-level descent of a vertically movable assembly. A wedge is mounted on the assembly for vertical movement therewith. A tracking member tracks movement of the wedge. A normally unlocked locking mechanism prevents vertical descent of the assembly when locked. A
coupling mechanism couples the tracking member to the locking mechanism. The tracking member moves in response to non-level descent of the assembly to shift the locking mechanism into its locked position.
Description
SAFETY STOP FOR STOPPING NON-LEVEL
DESCENT OF VERTICALLY MOVABLE ASSENBLY
FIELD OF T~IE INVENTION
This application pertains to safety stops for stopping non-level descent of vertically movable assemblies.
BACKGROUND OF THE INVENTION
There are a variety of situations in which a safety stopping mechanism of some sort must be provided to prevent non~
level descent of a vertically movable assembly. One such situation involves the operation of a vertical sort bin assembly of the type exemplified by Canadian patent No. 1,041,034 issued 24 October, 1978 for an invention of William R. Newnes. This patent describes a vertical sort bin which receives pieces of sorted lumber produced by a saw mill. As the bin fills with lumber it descends toward a conveyer. When the bin is filled with lumber the bottom of the bin is opened to allow the lumber ;to fall onto another conveyer which transports the lumber for ;further processing. The bin is supported at its opposed ends on a pair of runners which ride in vertical channels. Lumber deposited into the bin sometlmes jams in a manner which inter-feres with smooth, level descent of the assembly. Workmen must use pry bars to free the jammed lumber. There have been instances in which sort bins have suddenly descended upon workmen standing beneath the bins, seriously injuring the workmen.
Further hazards have been caused by lumber sliding out one end of the sort bin due to non-level descent of one side of the bin relative to the other.
The present invention provides a safety stop for stopping non-level descent of a vertically movable assembly such as a vertical sort bin in order to prevent the foregoing hazards.
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~266240 SUMMARY OF THE INVENTION
The invention provides a safety stop for stopping non-level descent of a vertically movable assembly. A detecting means detects non-level descent of the assembly and moves in response thereto. A normally unlocked locking means prevents vertical descent of the assembly. A coupling means couples the detecting means to the locking means. Movement of the detecting means upon detection of non-level descent of the assembly locks the locking means, thereby preventing further vertical descent of the assembly.
The detecting means may comprise a wedge means mounted on the assembly for vertical movement therewith; and, a wedge tracking means for tracking movement of the wedge means.
The coupling means may comprise a rod connected between the wedge tracking means and the locking means. The rod is preferably movable between a first position to unlock the locking means and a second position to lock the locking means. Non-level descent of the assembly which displaces the wedge means toward the wedge tracking means raises the wedge tracking means and thereby raises the rod into the second, locked position.
The coupling means may also incorporate a cable entrained between the wedge tracking means and the locking means.
More particularly, the cable may be entrained between the wedge tracking means and the rod. Non-level descent of the assembly which displaces the wedge means away from the wedge tracking means allows the wedge tracking means to descend with the cable and thereby raises the rod into its second, locked position.
The locking means may comprise at least one locking dog mounted for displacement by the rod.
Advantageously, the wedge tracking means may comprise a grooved member mounted for slidable displacement along the
DESCENT OF VERTICALLY MOVABLE ASSENBLY
FIELD OF T~IE INVENTION
This application pertains to safety stops for stopping non-level descent of vertically movable assemblies.
BACKGROUND OF THE INVENTION
There are a variety of situations in which a safety stopping mechanism of some sort must be provided to prevent non~
level descent of a vertically movable assembly. One such situation involves the operation of a vertical sort bin assembly of the type exemplified by Canadian patent No. 1,041,034 issued 24 October, 1978 for an invention of William R. Newnes. This patent describes a vertical sort bin which receives pieces of sorted lumber produced by a saw mill. As the bin fills with lumber it descends toward a conveyer. When the bin is filled with lumber the bottom of the bin is opened to allow the lumber ;to fall onto another conveyer which transports the lumber for ;further processing. The bin is supported at its opposed ends on a pair of runners which ride in vertical channels. Lumber deposited into the bin sometlmes jams in a manner which inter-feres with smooth, level descent of the assembly. Workmen must use pry bars to free the jammed lumber. There have been instances in which sort bins have suddenly descended upon workmen standing beneath the bins, seriously injuring the workmen.
Further hazards have been caused by lumber sliding out one end of the sort bin due to non-level descent of one side of the bin relative to the other.
The present invention provides a safety stop for stopping non-level descent of a vertically movable assembly such as a vertical sort bin in order to prevent the foregoing hazards.
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~266240 SUMMARY OF THE INVENTION
The invention provides a safety stop for stopping non-level descent of a vertically movable assembly. A detecting means detects non-level descent of the assembly and moves in response thereto. A normally unlocked locking means prevents vertical descent of the assembly. A coupling means couples the detecting means to the locking means. Movement of the detecting means upon detection of non-level descent of the assembly locks the locking means, thereby preventing further vertical descent of the assembly.
The detecting means may comprise a wedge means mounted on the assembly for vertical movement therewith; and, a wedge tracking means for tracking movement of the wedge means.
The coupling means may comprise a rod connected between the wedge tracking means and the locking means. The rod is preferably movable between a first position to unlock the locking means and a second position to lock the locking means. Non-level descent of the assembly which displaces the wedge means toward the wedge tracking means raises the wedge tracking means and thereby raises the rod into the second, locked position.
The coupling means may also incorporate a cable entrained between the wedge tracking means and the locking means.
More particularly, the cable may be entrained between the wedge tracking means and the rod. Non-level descent of the assembly which displaces the wedge means away from the wedge tracking means allows the wedge tracking means to descend with the cable and thereby raises the rod into its second, locked position.
The locking means may comprise at least one locking dog mounted for displacement by the rod.
Advantageously, the wedge tracking means may comprise a grooved member mounted for slidable displacement along the
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wedge means. The rod preferably penetrates the grooved member.
The rod is advantageously provided with flange means for contacting the grooved member upon ascent thereof.
The safety stop may also advantageously be provided with a pre~locking means for positioning the locking means for locking engagement thereof upon minimal vertical descent of the assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a partially fragmented pictorial illustra-tion of a portion of a lumber sorting assembly which incorporates a series of vertical sort bin assemblies, one of which is equipped with a pair of bin safety stops constructed in accord-ance with the invention.
Figure 2 is similar to Figure 1, but omits details of the lumber conveyors and sort bins to better illustrate the bin safety stop of the present invention.
Figure 3 is an enlarged, partially fragmented pictorial illustration of a pair of vertical sort bin safety stops constructed in accordance with the invention and in their normally unlocked positions.
Figure 4A is a front elevation view of the right hand bin safety stop depicted in Figure 3. Figure ~B is similar to Figure 4A, but shows the right hand bin safety stop in the locked position it assumes when it descends below the left hand bin safety stop. Figure 4C is also similar to Figure 4A, but shows the right hand bin safety stop in the locked position it assumes when the left hand bin safety stop descends below the right hand bin safety stop.
Figure 5A is a side eIevation view of the left hand bin safety stop depicted in Figure 3. Figure 5B is similar to Figure
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wedge means. The rod preferably penetrates the grooved member.
The rod is advantageously provided with flange means for contacting the grooved member upon ascent thereof.
The safety stop may also advantageously be provided with a pre~locking means for positioning the locking means for locking engagement thereof upon minimal vertical descent of the assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a partially fragmented pictorial illustra-tion of a portion of a lumber sorting assembly which incorporates a series of vertical sort bin assemblies, one of which is equipped with a pair of bin safety stops constructed in accord-ance with the invention.
Figure 2 is similar to Figure 1, but omits details of the lumber conveyors and sort bins to better illustrate the bin safety stop of the present invention.
Figure 3 is an enlarged, partially fragmented pictorial illustration of a pair of vertical sort bin safety stops constructed in accordance with the invention and in their normally unlocked positions.
Figure 4A is a front elevation view of the right hand bin safety stop depicted in Figure 3. Figure ~B is similar to Figure 4A, but shows the right hand bin safety stop in the locked position it assumes when it descends below the left hand bin safety stop. Figure 4C is also similar to Figure 4A, but shows the right hand bin safety stop in the locked position it assumes when the left hand bin safety stop descends below the right hand bin safety stop.
Figure 5A is a side eIevation view of the left hand bin safety stop depicted in Figure 3. Figure 5B is similar to Figure
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5A, but shows the left hand bin safety stop in the locked position it assumes when it descends below the riyht hand bin safety stop. Figure 5C is also similar to Figure sA, but shows the left hand bin safety stop in the locked position it assumes when the right hand bin safety stop descends below the left hand bin safety stop.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The drawings illustrate the manner in which the invention may be adapted for operation with a prior art vertical sort bin 10 of the type described in Canadian patent No.
1,041,034. It is to be understood however that the invention is of general application and may be adapted to stop non-level descent of a wide variety of vertically movable assemblies.
By way of background, Figure l shows a portion of a lumber sorting assembly A, which incorporates a series of vertical sort bin assemblies B1, B2, B3, etc., one of which, namely B3 (also identified by reference numeral lO), is equipped with a pair of bin safety stops 20, 22 constructed in accordance with the invention. Pieces of lumber are transported by upper conveyor C, from which they are controllably directed into selected sort bins. For example, eight foot long pieces of lumber may be directed into bin B1, ten foot long pieces of lumber may be directed into bin B2, twelve foot long pieces of lumber may be directed into bin B3, etc. as determined by an operator via suitable, known control equipment. As each bin fills with sorted lumber, the operator actuates a control to dump the bin contents onto lower conveyor D, which transports the pile of sorted Iumber for further processing elsewhere.
The mechanical structure of the preferred bin safety stop will first be described in relation to Figures 3, 4A and 5A.
Figure 4A illustrates some details of safety stop 22 which are obscured in Figure 3O The operation of the preferred bin safety
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5A, but shows the left hand bin safety stop in the locked position it assumes when it descends below the riyht hand bin safety stop. Figure 5C is also similar to Figure sA, but shows the left hand bin safety stop in the locked position it assumes when the right hand bin safety stop descends below the left hand bin safety stop.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The drawings illustrate the manner in which the invention may be adapted for operation with a prior art vertical sort bin 10 of the type described in Canadian patent No.
1,041,034. It is to be understood however that the invention is of general application and may be adapted to stop non-level descent of a wide variety of vertically movable assemblies.
By way of background, Figure l shows a portion of a lumber sorting assembly A, which incorporates a series of vertical sort bin assemblies B1, B2, B3, etc., one of which, namely B3 (also identified by reference numeral lO), is equipped with a pair of bin safety stops 20, 22 constructed in accordance with the invention. Pieces of lumber are transported by upper conveyor C, from which they are controllably directed into selected sort bins. For example, eight foot long pieces of lumber may be directed into bin B1, ten foot long pieces of lumber may be directed into bin B2, twelve foot long pieces of lumber may be directed into bin B3, etc. as determined by an operator via suitable, known control equipment. As each bin fills with sorted lumber, the operator actuates a control to dump the bin contents onto lower conveyor D, which transports the pile of sorted Iumber for further processing elsewhere.
The mechanical structure of the preferred bin safety stop will first be described in relation to Figures 3, 4A and 5A.
Figure 4A illustrates some details of safety stop 22 which are obscured in Figure 3O The operation of the preferred bin safety
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stop will then be described with reference to Figures 4A, 4B, 4C, 5A, 5B and 5C.
Sort bin 10 is supported at its opposed left and right hand ends 12, 14 (Figure 3) for vertical movement relative to vertical supports 16, 18. Sort bin 10 is provided with a pair of safety stops 20, 22 each of which is constructed in accordance with the preferred embodiment hereinafter described. More particularly, safety stop 20 is provided at end 12 of sort bin 10 and safety stop 22 is provided at end 14 of sort bin 10.
Each of safety stops 20, 22 incorporates a "detecting means" for detecting non-level descent of the end of sort bin 10 with which the particular safety stop is associated. The detecting means moves, as hereinafter described, in response to detected non-level descent of sort bin 10, to prevent further descent of the bin. The detecting means incorporated in each of safety stops 20, 22 includes a "wedge means"; namely, wedges 24, 26 each of which are securely fastened to the respective ends 12, 14 of sort bin 10 so that wedges 24, 26 move vertically with sort bin 10. The detecting means incorporated in each of safety stops 20, 22 also includes a "wedge tracking means" or "tracking member"; namely, cylinders 28, 30 each of which has an encircling groove 29, 31 into which wedges 24, 26 respectively protrude.
Grooved cylinders 28, 30 thus rest atop wedges 24, 26 respective-ly, enabling grooved cylinders 28, 30 to track movement of wedges 24, 26 by sliding therealong as hereinafter explained.
In addition to the "detecting means" previously described, each of safety stops 20, 22 also incorporates a "locking means" and a "coupling means". In the preferred embodiment, the "locking means" takes the form of at least one normally unlocked locking dog 32, 34 capable of preventing vertical descent of sort bin 10 when moved into a locked position as hereinafter described (four such dogs are employed in each of safety stops 20, 22 as illustrated). The "coupling means"
preferably takes the form of cables 36, 38 and rods 40, 42 which .
~6~0 together couple grooved cylinders 28, 30 to locking dogs 32, 34 respectively as hereinafter described. Each of rods 40, 42 may be vertically moved, in the manner hereinafter explained, between the first, unlocked positions respectively depicted in Figures 5A and 4A, and the second, locked positions respectively depicted in Figures 5B, 5C, 4B and 4C.
One end of each of cables 36, 38 is attached to a first threaded member 44, 46 which is in turn threadably fastened to a bracket 45, 47 attached to the end of cylinders 28, 30 respectively. The opposite ends of cables 36, 38 are respect-ively attached to second threaded members 49, 51 into which the upper ends of rods 40, 42 are threadably fastened, thus suspend-ing rods 40, 42 from cables 36, 38 respectively. The suspended rods pass through apertures in each of grooved cylinders 28, 30.
The hooked lower ends 52, 54 of rods 40, 42 extend beneath dogs 32, 34 respectively such that lifting of rods 40, 42 lifts dogs 32, 34 into their locked positions, as hereinafter explained.
Cables 36, 38 are entrained over rollers 48, 50 respectively which are in turn mounted for vertical movement with sort bin ends 12, 14 respectively. First threaded members 44, 46 are threadably adjusted, within brackets 45, 47 to raise or lower rod ends 52, 54 so that they ~ust touch the lowermost of dogs 32, 34 when the dogs are in their unlocked positions depicted in Figures 4A and 5A.
To ensure that any pivoting of sort bin 10 due to non-level descent thereof will occur at the junction of wedges 24, 26 with grooved cylinders 28, 30; stiffening braces 70, 72 are provided between bin horizontal frame member 74 and the wide flanges of vertical supports 16, 18 within which the sort bin ends are vertically displaced to raise or lower sort bin 10.
The ends of braces 70, 72 opposite frame member 74 ride on the sort bin ends in the wide flanges of vertical supports 16, 18.
In operation, sort bin 10 moves vertically with respect to supports 16, 18. So long as sort bin ends 12, 14 remain level 1~66240 with respect to one another, safety stops 20, 22 remain inactive and locking dogs 32, 34 remain in their unlocked positions.
Suppose, however, that level descent of sort bin 10 is disrupted in some way such that left hand sort bin end 12 is lower than right hand sort bin end 14. This means that wedge 24 drops relative to grooved cylinder 28. More particularly, wedge 24 is displaced toward grooved cylinder 28, causing grooved cylinder 28 to slide upwardly along wedge 24. The upper surface of grooved cylinder 28 contacts nuts 56 (Figures 5A and 5B) which are threaded onto the upper end of rod 40 to serve as a "flange means" for catching grooved cylinder 28 upon ascent thereof.
Accordingly, as grooved cylinder 28 is displaced upwardly it contacts nuts 56, thus carrying rod 40 upwardly into its second position, raising locking dog 32 into locking engagement (as depicted in Figure 5B) between the wide flange of vertical support 16 and clamp block 55, which is affixed to end plate 76.
The corresponding action of right hand sort bin end is depicted in Figure 4C, and will now be described. Right hand sort bin end 14 is higher than left hand sort bin end 12, so wedge 26 is displaced downwardly relative to grooved cylinder 30.
That is, wedge 26 moves away from grooved cylinder 30, thus allowing grooved cylinder 30 to descend relative to wedge 26.
Grooved cylinder 30 is weighted so that, as it descends, it draws cable 38 downwardly, thus raising rod 42 into its second position (Figure 4C) in which locking dog 34 locks between the wide flange of vertical support 18 and clamp block 57 affixed to end plate 78. It can thus be seen that both ends of sort bin 10 are firmly locked in position relative to supports 16, 18, preventing further non-level descent of sort bin 10.
Figures 5C and 4B respectively depict the locking action which occurs when the reverse situation prevails; that is, when level descent of sort bin 10 is disrupted in some way such that left hand sort bin end 12 is higher than right hand sort bin end 14.
1~6~i~40 A "pre-locking means" may advantageously be provided.
As depicted in the drawings, the "pre-locking means" consists of a third cable 58 (Figures 3, 5A and 5B), one end of which i5 fastened around grooved cylinder 28 with the aid of cable crimp 60. Cable 58 is entrained around pulley 62 (Figure 3) mounted at the upper end of vertical support 16. The opposite end of cable 58 is connected to one end of chain 64, which hangs within chain box 66, the opposed chain end 65 being horizontally welded to the upper edge of chain box 66. If workmen are required to work beneath sort bin 10, chain 64 is locked into position as follows for safety purposes. Chain 64 and cable 58 are drawn taut to raise grooved cylinder 28 so that its upper rim just comes into contact with nuts 56 on the upper end of rod 40, without actually raising rod 40. The next available chain link (i.e. the one which, if drawn taut as aforesaid, would raise rod 40) is padlocked to fixed link 65. It will be understood that upon minimal descent of sort bin 10, grooved cylinder 28 will be further upwardly displaced and locking dog 32 will immediately be raised into its locked position, preventing further descent of sort bin 10. The "prelocking means" thus prevents downward "creeping" of sort bin lO which could otherwise occur due to the action of the hydraulic cylinders which raise and lower sort bin 10 .
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifica-tions are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
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stop will then be described with reference to Figures 4A, 4B, 4C, 5A, 5B and 5C.
Sort bin 10 is supported at its opposed left and right hand ends 12, 14 (Figure 3) for vertical movement relative to vertical supports 16, 18. Sort bin 10 is provided with a pair of safety stops 20, 22 each of which is constructed in accordance with the preferred embodiment hereinafter described. More particularly, safety stop 20 is provided at end 12 of sort bin 10 and safety stop 22 is provided at end 14 of sort bin 10.
Each of safety stops 20, 22 incorporates a "detecting means" for detecting non-level descent of the end of sort bin 10 with which the particular safety stop is associated. The detecting means moves, as hereinafter described, in response to detected non-level descent of sort bin 10, to prevent further descent of the bin. The detecting means incorporated in each of safety stops 20, 22 includes a "wedge means"; namely, wedges 24, 26 each of which are securely fastened to the respective ends 12, 14 of sort bin 10 so that wedges 24, 26 move vertically with sort bin 10. The detecting means incorporated in each of safety stops 20, 22 also includes a "wedge tracking means" or "tracking member"; namely, cylinders 28, 30 each of which has an encircling groove 29, 31 into which wedges 24, 26 respectively protrude.
Grooved cylinders 28, 30 thus rest atop wedges 24, 26 respective-ly, enabling grooved cylinders 28, 30 to track movement of wedges 24, 26 by sliding therealong as hereinafter explained.
In addition to the "detecting means" previously described, each of safety stops 20, 22 also incorporates a "locking means" and a "coupling means". In the preferred embodiment, the "locking means" takes the form of at least one normally unlocked locking dog 32, 34 capable of preventing vertical descent of sort bin 10 when moved into a locked position as hereinafter described (four such dogs are employed in each of safety stops 20, 22 as illustrated). The "coupling means"
preferably takes the form of cables 36, 38 and rods 40, 42 which .
~6~0 together couple grooved cylinders 28, 30 to locking dogs 32, 34 respectively as hereinafter described. Each of rods 40, 42 may be vertically moved, in the manner hereinafter explained, between the first, unlocked positions respectively depicted in Figures 5A and 4A, and the second, locked positions respectively depicted in Figures 5B, 5C, 4B and 4C.
One end of each of cables 36, 38 is attached to a first threaded member 44, 46 which is in turn threadably fastened to a bracket 45, 47 attached to the end of cylinders 28, 30 respectively. The opposite ends of cables 36, 38 are respect-ively attached to second threaded members 49, 51 into which the upper ends of rods 40, 42 are threadably fastened, thus suspend-ing rods 40, 42 from cables 36, 38 respectively. The suspended rods pass through apertures in each of grooved cylinders 28, 30.
The hooked lower ends 52, 54 of rods 40, 42 extend beneath dogs 32, 34 respectively such that lifting of rods 40, 42 lifts dogs 32, 34 into their locked positions, as hereinafter explained.
Cables 36, 38 are entrained over rollers 48, 50 respectively which are in turn mounted for vertical movement with sort bin ends 12, 14 respectively. First threaded members 44, 46 are threadably adjusted, within brackets 45, 47 to raise or lower rod ends 52, 54 so that they ~ust touch the lowermost of dogs 32, 34 when the dogs are in their unlocked positions depicted in Figures 4A and 5A.
To ensure that any pivoting of sort bin 10 due to non-level descent thereof will occur at the junction of wedges 24, 26 with grooved cylinders 28, 30; stiffening braces 70, 72 are provided between bin horizontal frame member 74 and the wide flanges of vertical supports 16, 18 within which the sort bin ends are vertically displaced to raise or lower sort bin 10.
The ends of braces 70, 72 opposite frame member 74 ride on the sort bin ends in the wide flanges of vertical supports 16, 18.
In operation, sort bin 10 moves vertically with respect to supports 16, 18. So long as sort bin ends 12, 14 remain level 1~66240 with respect to one another, safety stops 20, 22 remain inactive and locking dogs 32, 34 remain in their unlocked positions.
Suppose, however, that level descent of sort bin 10 is disrupted in some way such that left hand sort bin end 12 is lower than right hand sort bin end 14. This means that wedge 24 drops relative to grooved cylinder 28. More particularly, wedge 24 is displaced toward grooved cylinder 28, causing grooved cylinder 28 to slide upwardly along wedge 24. The upper surface of grooved cylinder 28 contacts nuts 56 (Figures 5A and 5B) which are threaded onto the upper end of rod 40 to serve as a "flange means" for catching grooved cylinder 28 upon ascent thereof.
Accordingly, as grooved cylinder 28 is displaced upwardly it contacts nuts 56, thus carrying rod 40 upwardly into its second position, raising locking dog 32 into locking engagement (as depicted in Figure 5B) between the wide flange of vertical support 16 and clamp block 55, which is affixed to end plate 76.
The corresponding action of right hand sort bin end is depicted in Figure 4C, and will now be described. Right hand sort bin end 14 is higher than left hand sort bin end 12, so wedge 26 is displaced downwardly relative to grooved cylinder 30.
That is, wedge 26 moves away from grooved cylinder 30, thus allowing grooved cylinder 30 to descend relative to wedge 26.
Grooved cylinder 30 is weighted so that, as it descends, it draws cable 38 downwardly, thus raising rod 42 into its second position (Figure 4C) in which locking dog 34 locks between the wide flange of vertical support 18 and clamp block 57 affixed to end plate 78. It can thus be seen that both ends of sort bin 10 are firmly locked in position relative to supports 16, 18, preventing further non-level descent of sort bin 10.
Figures 5C and 4B respectively depict the locking action which occurs when the reverse situation prevails; that is, when level descent of sort bin 10 is disrupted in some way such that left hand sort bin end 12 is higher than right hand sort bin end 14.
1~6~i~40 A "pre-locking means" may advantageously be provided.
As depicted in the drawings, the "pre-locking means" consists of a third cable 58 (Figures 3, 5A and 5B), one end of which i5 fastened around grooved cylinder 28 with the aid of cable crimp 60. Cable 58 is entrained around pulley 62 (Figure 3) mounted at the upper end of vertical support 16. The opposite end of cable 58 is connected to one end of chain 64, which hangs within chain box 66, the opposed chain end 65 being horizontally welded to the upper edge of chain box 66. If workmen are required to work beneath sort bin 10, chain 64 is locked into position as follows for safety purposes. Chain 64 and cable 58 are drawn taut to raise grooved cylinder 28 so that its upper rim just comes into contact with nuts 56 on the upper end of rod 40, without actually raising rod 40. The next available chain link (i.e. the one which, if drawn taut as aforesaid, would raise rod 40) is padlocked to fixed link 65. It will be understood that upon minimal descent of sort bin 10, grooved cylinder 28 will be further upwardly displaced and locking dog 32 will immediately be raised into its locked position, preventing further descent of sort bin 10. The "prelocking means" thus prevents downward "creeping" of sort bin lO which could otherwise occur due to the action of the hydraulic cylinders which raise and lower sort bin 10 .
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifica-tions are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
Claims (23)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A safety stop for stopping non-level descent of a vertical-ly movable assembly, said safety stop comprising:
(a) detecting means for detecting non-level descent of said assembly and for moving in response thereto;
(b) normally unlocked locking means for preventing vertical descent of said assembly; and, (c) coupling means for coupling said detecting means to said locking means;
whereby movement of said detecting means upon detection of non-level descent of said assembly locks said locking means, thereby preventing further vertical descent of said assemb-ly.
(a) detecting means for detecting non-level descent of said assembly and for moving in response thereto;
(b) normally unlocked locking means for preventing vertical descent of said assembly; and, (c) coupling means for coupling said detecting means to said locking means;
whereby movement of said detecting means upon detection of non-level descent of said assembly locks said locking means, thereby preventing further vertical descent of said assemb-ly.
2. A safety stop as defined in claim 1, wherein said detecting means further comprises:
(a) wedge means mounted on said assembly for vertical movement therewith; and, (b) wedge tracking means for tracking movement of said wedge means.
(a) wedge means mounted on said assembly for vertical movement therewith; and, (b) wedge tracking means for tracking movement of said wedge means.
3. A safety stop as defined in claim 2, wherein said coupling means further comprises a rod connected between said wedge tracking means and said locking means.
4. A safety stop as defined in claim 3, wherein said rod is movable between a first position to unlock said locking means, and a second position to lock said locking means.
5. A safety stop as defined in claim 4, wherein non-level descent of said assembly displaces said wedge means toward said wedge tracking means, raising said wedge tracking means and thereby raising said rod into said second position.
6. A safety stop as defined in claim 4, wherein said coupling means further comprises a cable entrained between said wedge tracking means and said locking means.
7. A safety stop as defined in claim 6, wherein said cable is entrained between said wedge tracking means and said rod.
8. A safety stop as defined in claim 7, wherein non-level descent of said assembly displaces said wedge means away from said wedge tracking means, allowing said wedge tracking means to descend with said cable and thereby raising said rod into said second position.
9. A safety stop as defined in claim 7, wherein said locking means comprises at least one locking dog mounted for displacement by said rod.
10. A safety stop as defined in claim 9, wherein said wedge tracking means further comprises a grooved member mounted for slidable displacement along said wedge means.
11. A safety stop as defined in claim 10, wherein said rod penetrates said grooved member.
12. A safety stop as defined in claim 11, wherein said rod further comprises flange means for contacting said grooved member upon ascent of said grooved member.
13. A safety stop as defined in claim 12, further comprising pre-locking means for positioning said locking means for locking engagement thereof upon minimal vertical descent of said assembly.
14. A safety stop for stopping non-level descent of a vertical-ly movable assembly, said safety stop comprising:
(a) wedge means mounted on said assembly for vertical movement therewith;
(b) a tracking member mounted for displacement relative to said wedge means;
(c) at least one normally unlocked locking dog for prevent-ing vertical descent of said assembly; and, (d) coupling means for coupling said tracking member to said locking dog;
whereby non-level descent of said assembly displaces said tracking member and said coupling means, thereby locking said locking dog to prevent further vertical descent of said assembly.
(a) wedge means mounted on said assembly for vertical movement therewith;
(b) a tracking member mounted for displacement relative to said wedge means;
(c) at least one normally unlocked locking dog for prevent-ing vertical descent of said assembly; and, (d) coupling means for coupling said tracking member to said locking dog;
whereby non-level descent of said assembly displaces said tracking member and said coupling means, thereby locking said locking dog to prevent further vertical descent of said assembly.
15. A safety stop as defined in claim 14, wherein said coupling means further comprises a rod connected between said track-ing member and said locking dog.
16. A safety stop as defined in claim 15, wherein said rod is movable between a first position to unlock said locking dog, and a second position to lock said locking dog.
17. A safety stop as defined in claim 16, wherein non-level descent of said assembly displaces said wedge means toward said tracking member, raising said tracking member and thereby raising said rod into said second position.
18. A safety stop as defined in claim 16, wherein said coupling means further comprises a cable entrained between said tracking member and said rod.
19. A safety stop as defined in claim 18, wherein non-level descent of said assembly displaces said wedge means away from said tracking member, allowing said tracking member to descend with said cable, thereby raising said rod into said second position.
20. A safety stop as defined in claim 19, wherein said tracking member further comprises a grooved member mounted for slid-able displacement along said wedge means.
21. A safety stop as defined in claim 20, wherein said rod penetrates said grooved member.
22. A safety stop as defined in claim 21, wherein said rod further comprises flange means for contacting said grooved member upon ascent of said grooved member.
23. A safety stop as defined in claim 22, further comprising pre-locking means for positioning said locking dog for locking engagement thereof upon minimal vertical descent of said assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000594037A CA1266240A (en) | 1989-03-17 | 1989-03-17 | Safety stop for stopping non-level descent of vertically movable assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000594037A CA1266240A (en) | 1989-03-17 | 1989-03-17 | Safety stop for stopping non-level descent of vertically movable assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1266240A true CA1266240A (en) | 1990-02-27 |
Family
ID=4139782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000594037A Expired - Fee Related CA1266240A (en) | 1989-03-17 | 1989-03-17 | Safety stop for stopping non-level descent of vertically movable assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1266240A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114890160B (en) * | 2022-05-20 | 2024-02-20 | 广东信源物流设备有限公司 | Airport logistics auxiliary boxing treatment system and boxing method thereof |
-
1989
- 1989-03-17 CA CA000594037A patent/CA1266240A/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114890160B (en) * | 2022-05-20 | 2024-02-20 | 广东信源物流设备有限公司 | Airport logistics auxiliary boxing treatment system and boxing method thereof |
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