CA1088128A - Device for opening and closing a side plate of a loading box on freight vehicles under no-load condition - Google Patents
Device for opening and closing a side plate of a loading box on freight vehicles under no-load conditionInfo
- Publication number
- CA1088128A CA1088128A CA330,222A CA330222A CA1088128A CA 1088128 A CA1088128 A CA 1088128A CA 330222 A CA330222 A CA 330222A CA 1088128 A CA1088128 A CA 1088128A
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- Canada
- Prior art keywords
- rod
- spring
- side plate
- arm
- articulated
- Prior art date
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- Vehicle Body Suspensions (AREA)
- Auxiliary Methods And Devices For Loading And Unloading (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a device for opening and closing a side plate of a loading box on freight vehicles under no-load condition wherein the side plate is outwardly openably hinged at its bottom edge to the outer side edge of the floor plate of the loading box, an actuating or interlocking mechanism is provided which comprises an upper actuating connecting rod and a lower actuating connecting rod. The upper actuating connecting rod has the upper end thereof articulated to the outer surface of the side plate and the lower end thereof articulated to the upper end of the lower actuating connect-ing rod, the lower end of which is articulated to a lower portion of a support member downwardly projected from the underside of the floor plate. Thus, the mechanism is twice-fosdable. The actuating or interlocking mechanism may be resiliently pulled by a spring having the base thereof connected to the underside of the floor plate.
In a device for opening and closing a side plate of a loading box on freight vehicles under no-load condition wherein the side plate is outwardly openably hinged at its bottom edge to the outer side edge of the floor plate of the loading box, an actuating or interlocking mechanism is provided which comprises an upper actuating connecting rod and a lower actuating connecting rod. The upper actuating connecting rod has the upper end thereof articulated to the outer surface of the side plate and the lower end thereof articulated to the upper end of the lower actuating connect-ing rod, the lower end of which is articulated to a lower portion of a support member downwardly projected from the underside of the floor plate. Thus, the mechanism is twice-fosdable. The actuating or interlocking mechanism may be resiliently pulled by a spring having the base thereof connected to the underside of the floor plate.
Description
This is a divisional application of Canadian applica-tion No. 262,284, filed on September 29, lg76.
This invention relates to improvements in a device Eor opening and closing a side pla-te of a loading box on freight vehicles, such as a motor truck under no-load condition.
When a side plate or door of the loading box is pivotally opened or closed, the rota~ional moment resulting from the gravity of the side plate is varied and accordingly, the force required for the opening or the closing is also varied.
The conventional opening-closing auxiliary fi-tting has been operable with a torsion spring attached to the hinge of the side plate or with a plate spring acting on the side plate. In any oE these, the action has gradually increased as the pivotal movement of the side plate progresses downwardly, so that the equilibrium in the course of the pivo-tal movement has been insufficient in most part of the course. In addition, a point of equilibrium has been present in the course of the openin~ movement to prevent the door from being fully opened.
~t is the object of the present inven-tion to overcome the above-noted disadvan-tages peculiar to the prior ar-t.
To achieve such an object, the invention as herein claimed is a device for counterbalancing, during opening and closing, the weight o side plate oE a loading box on a motor truck, the sidè plate being outwardly openably hinged at i-ts bottom edge to the outer side edge of the floor plate of the box. The device comprises an ac-tuating mechanism connected to the side plate and including a four-rod linkage and spring means actin~ on this linkage to urge the side plate towards its closed position thereby counterbalancing the weight of the side plate. The actuating mechanism comprises an upper and a lower actuatin~ rod forming a first and a second rod of the linkag~. These first two rods are articulated to each other at * a support arm downwardly depending from the underside of the floor plate and .
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adjacent ends while the upper rod is further actua-ed at an upper end thereof to a point on the outer surface of the side plate while the lower rod is likewise further articulated at a lower end to a first portion of the support arm. A flicking arm rod has a lower end articulated to a second portion of the support arm and forms a third rod of the linkage. A control connectinS rod, acting as a fourth rod of the aforesaid linkage, has its opposite ends articulated to and intermediate the ends of the flicking arm rod and articulated to and intermediate the ends o the lower actuating rod. The spring means is mounted to act on the flicking arm rod.
The invention will hereinafter be described with respect to various embodiments thereof as shown in the accompa-nyin~, drawings, throughout which identical reEerence characters designate identical or equivalent parts.
Figure 1 is a side view showing the arrangement according to a first embodiment of the present invention.
Figure 2 is a side view showing an alternative form of the first embodiment of the presen-t invention.
Figure ~ illustrates the operation of the Figure 2 embodiment.
Fi~ure 4 is a graph illustrating the moment of load in the Figure 2 embodiment.
Figu~e 5 is a ront view of a second embodiment of the presen-t invention.
Figure 6 is a ront elevation illustrating the operation oE the second embodiment.
Figures 7 and 8 show, in ~ront view, alternative - . . . . . . . ...
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~8~28 forms of the second embodiment.
igures 9, 10 and 11 are graphs of curves for reaction forces.
Figure 12 is a front view of a third embodiment.
Figure 13 is a front elevation illustrating the operation of the third embodiment.
Figure 14 is a front elevation of a fourth embodi-ment.
Figure 15 is a vertical cross-sectional view of the ~ourth embodiment.
Figure 16 illustrates the operation of the fourth embodiment.
First Embocliment Referring to Figures 1 to ~, the loading box a of a motor truck as a kind of freight vehicles includes a floor plate 1 having an outer side edge 2. At its bottom edge 3, a side plate 4 is outwardly openably hinged to the ~uter side edge 2, and an upper actuating connecting rod 9 has the upper end 11 ~hereof articulated to the outer sur~ace 5 o~ the side plate ~ and has the lower end 12 thereoE articulated to the upper end 13 of a lower actuating connecting rod 10 which is inturnarticulated to the lower portion 8 of a support arm 7 downwardly depending from the underside 6 of the floor plate 1, thus providing an actuating mechanism ~. A portion 14 of the lower actuating connecting rod 10 may be resilient-ly pulled by a spring 16 which may have its base 15 engaged with the underside o the floor plate 1. Alternatively, such spring may have it5 lower end 17 engaged with one end 21 of a flexible connec-ting cord 20, which ln turn has its base end 18 engaged with a portion 14 of the lower actuating connecting rod 10 of the actuating mechanism b and has its intermediate portion supported and guided by a support rooler ''''"
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19. There is further seen a chassis frame c, a cross sill d, a vertical sill e, a hinge 22, articulation pivots 23, 24, 25, 26, a shaft 27 for the support roller 19, and a plurality of spring force adjusting engagement members 28 which may be selectively engaged by the spring 16 to change the initial tension of the spring.
Thus, the pull force of the spring may always be maintained constant by actuating the spring through the agency of the flexible connecting cord.
Figure 3 illustrates the operation of the Figure 2 embodiment and, as will be seen in Figure 4, the action force of the spring can easily pass through the dead point to maintain the side plate 4 in its fully opened, downwardly vertical position.
Thus, even or the variation in type of freight vehicles or for the variation in weight of the side plate resulting from its construction, the action force of the present mechanism can be suitably selected and applied by varying the initial tension imparted to the spring or by varying the strength oE the spring.
Also. depending on the size of the side plate, it i5 possible to make the operation of the mechanism effective by a suitable number of side plates.
Thus, according to the present invention, the side plate can be opened and closed always under no-load condition with respect to the gravity thereof.
Second Embodiment ~eferring to Figures 5 to 11, the loading box a of a motor truck as a kind o~ freight vehicles includes a floor plate 1 having an outer side edge 2. At its bottom edge 3, a side plate 4 is outwardly openably hinged to the side edge
This invention relates to improvements in a device Eor opening and closing a side pla-te of a loading box on freight vehicles, such as a motor truck under no-load condition.
When a side plate or door of the loading box is pivotally opened or closed, the rota~ional moment resulting from the gravity of the side plate is varied and accordingly, the force required for the opening or the closing is also varied.
The conventional opening-closing auxiliary fi-tting has been operable with a torsion spring attached to the hinge of the side plate or with a plate spring acting on the side plate. In any oE these, the action has gradually increased as the pivotal movement of the side plate progresses downwardly, so that the equilibrium in the course of the pivo-tal movement has been insufficient in most part of the course. In addition, a point of equilibrium has been present in the course of the openin~ movement to prevent the door from being fully opened.
~t is the object of the present inven-tion to overcome the above-noted disadvan-tages peculiar to the prior ar-t.
To achieve such an object, the invention as herein claimed is a device for counterbalancing, during opening and closing, the weight o side plate oE a loading box on a motor truck, the sidè plate being outwardly openably hinged at i-ts bottom edge to the outer side edge of the floor plate of the box. The device comprises an ac-tuating mechanism connected to the side plate and including a four-rod linkage and spring means actin~ on this linkage to urge the side plate towards its closed position thereby counterbalancing the weight of the side plate. The actuating mechanism comprises an upper and a lower actuatin~ rod forming a first and a second rod of the linkag~. These first two rods are articulated to each other at * a support arm downwardly depending from the underside of the floor plate and .
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adjacent ends while the upper rod is further actua-ed at an upper end thereof to a point on the outer surface of the side plate while the lower rod is likewise further articulated at a lower end to a first portion of the support arm. A flicking arm rod has a lower end articulated to a second portion of the support arm and forms a third rod of the linkage. A control connectinS rod, acting as a fourth rod of the aforesaid linkage, has its opposite ends articulated to and intermediate the ends of the flicking arm rod and articulated to and intermediate the ends o the lower actuating rod. The spring means is mounted to act on the flicking arm rod.
The invention will hereinafter be described with respect to various embodiments thereof as shown in the accompa-nyin~, drawings, throughout which identical reEerence characters designate identical or equivalent parts.
Figure 1 is a side view showing the arrangement according to a first embodiment of the present invention.
Figure 2 is a side view showing an alternative form of the first embodiment of the presen-t invention.
Figure ~ illustrates the operation of the Figure 2 embodiment.
Fi~ure 4 is a graph illustrating the moment of load in the Figure 2 embodiment.
Figu~e 5 is a ront view of a second embodiment of the presen-t invention.
Figure 6 is a ront elevation illustrating the operation oE the second embodiment.
Figures 7 and 8 show, in ~ront view, alternative - . . . . . . . ...
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.. . . . ~:
- . : . - :
~8~28 forms of the second embodiment.
igures 9, 10 and 11 are graphs of curves for reaction forces.
Figure 12 is a front view of a third embodiment.
Figure 13 is a front elevation illustrating the operation of the third embodiment.
Figure 14 is a front elevation of a fourth embodi-ment.
Figure 15 is a vertical cross-sectional view of the ~ourth embodiment.
Figure 16 illustrates the operation of the fourth embodiment.
First Embocliment Referring to Figures 1 to ~, the loading box a of a motor truck as a kind of freight vehicles includes a floor plate 1 having an outer side edge 2. At its bottom edge 3, a side plate 4 is outwardly openably hinged to the ~uter side edge 2, and an upper actuating connecting rod 9 has the upper end 11 ~hereof articulated to the outer sur~ace 5 o~ the side plate ~ and has the lower end 12 thereoE articulated to the upper end 13 of a lower actuating connecting rod 10 which is inturnarticulated to the lower portion 8 of a support arm 7 downwardly depending from the underside 6 of the floor plate 1, thus providing an actuating mechanism ~. A portion 14 of the lower actuating connecting rod 10 may be resilient-ly pulled by a spring 16 which may have its base 15 engaged with the underside o the floor plate 1. Alternatively, such spring may have it5 lower end 17 engaged with one end 21 of a flexible connec-ting cord 20, which ln turn has its base end 18 engaged with a portion 14 of the lower actuating connecting rod 10 of the actuating mechanism b and has its intermediate portion supported and guided by a support rooler ''''"
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19. There is further seen a chassis frame c, a cross sill d, a vertical sill e, a hinge 22, articulation pivots 23, 24, 25, 26, a shaft 27 for the support roller 19, and a plurality of spring force adjusting engagement members 28 which may be selectively engaged by the spring 16 to change the initial tension of the spring.
Thus, the pull force of the spring may always be maintained constant by actuating the spring through the agency of the flexible connecting cord.
Figure 3 illustrates the operation of the Figure 2 embodiment and, as will be seen in Figure 4, the action force of the spring can easily pass through the dead point to maintain the side plate 4 in its fully opened, downwardly vertical position.
Thus, even or the variation in type of freight vehicles or for the variation in weight of the side plate resulting from its construction, the action force of the present mechanism can be suitably selected and applied by varying the initial tension imparted to the spring or by varying the strength oE the spring.
Also. depending on the size of the side plate, it i5 possible to make the operation of the mechanism effective by a suitable number of side plates.
Thus, according to the present invention, the side plate can be opened and closed always under no-load condition with respect to the gravity thereof.
Second Embodiment ~eferring to Figures 5 to 11, the loading box a of a motor truck as a kind o~ freight vehicles includes a floor plate 1 having an outer side edge 2. At its bottom edge 3, a side plate 4 is outwardly openably hinged to the side edge
2. ~n interlocking mechanism _ for holding the side plate `
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in equilibration by being resiliently pulled downwardly and sidewise of the floor plate by a pull spring 29 comprises two upper and lower actuating connecting rods 30 and..31 and is twice-foldably articulated to a point on the outer surface 5 of the side plate and to the lower portion of a support arm 7 downwardly projected from the underside 6 of the floor plate.
More particularly, the upper end 32 of the upper actuating connecting rod 30 may be articulated at 33 to a point on the outer surface 5 of the side plate 4 while the lower end 34 thereof may be articulated at 35 to the upper end of the lower actuating connecting .rod 31, the lower end of which may in turn be articulated at 37 to the lower portion 8 of the afore-mentioned support arm 7. Further, a flicking arm rod 42 may have the lower end 39 thereof art`iculated to the upper portion ~0 of ~he ~s~lpport arm 7 and may have the upper end 43 engaged , with the forward ènd pulling portion 38 of -the pull spring 29.. A control connecting rod 47 may have~the opposite ends 48 and 49 thereof articulated at 45 and 46 to intermediate portions"50 and 5~ of the lower actuating connecting ~rod 31 and the flicking~arm rod 42,`respectively. F~lrther alternative-ly, the adjustment of the pull force of the pull spring 29 may be accomplishe~ by changing,the~points of ar-ticulation 52, 52,...... ~etween the flicking arm rod 42 and the support arm 7 or by changing the points of engagement 54, 54, ...... of the base 53 of the pull spring 29.
Designated by 55 is a rod by which the base 53 of the pull spring 29 is engaged. The base 53 may be engaged in one o~ engagement holes at po~ints of engagement 54, 54, p.rovided in a projected~support edge 57 formed on a support frame 56 discretely formed projectedly on the underside 6 of the floor plate 1, and then may be fastened by a nut 58.
When the side plate of the motor truck is opened or . -- 5 --, ~ B~
closed under no-load condition by operating the interlocking mechanism for holding the side plate in equilibration by being resiliently pulled downwardly and sidewise of the floor plate by the pull spring which comprises two upper and lower actuating connecting rods and es twice-foldably articulated to a point on the outer surface of the side plate and to the lower portion of the support arm downwardly projected from the underside of the floor plate, the pull spring may some-times be broken during the operation because it es directly connected to the interlocking mechanism.
Thus, in putting the device of this type into practice, it is necessary that an assistance may be provided even for other side plate which will undergo a different momen~ of loacl ~xerted on the upper actuating co~nected rod 30 oE the actuating mechanisrm b of the device, because the .`weight per meter, height, length, length and other factors ~.
of the same device vary within a certain range.
If the moment of load e.~erted on the actuating connecting rod 30 of this device :is greater than the standard moment of load and if the difference is small, it will offer no inconvenience simply to adjust the pull spring alone but, if the difference is great, the curve I of the reaction force resulting from the device will be widely deviated Erom the curve II of the rotational force resulting from the gravity of the side plàte, as seen en Figure 10.
Therefore, when the device of the present invention is used by being a-ttached to a side plate which will undergo a greate~ monlent of load than the standard moment of load of th.is device, it is possible to a9sist the spring by changing the point of articulation be-tween the flicking arm rod 42 and the support arm 7 as shown in Figure 7 .: - 6 -~ 38~28 or changing the point of engagement of the base of the pull spring as shown in Figure 8, in accordance with increase in the moment of load, thereby adjusting the operating angle of the pull spring.
Figure 11 is a graph illustrating the curve of the reaction force provided by changing the point of articulation of the flicking arm rod and adjusting the pull spring in order that the device may be attached to a side plate which will undergo a greater moment of load~
Thus, according to -the present device, the standard moment of load is first determined and a pull ~pring matching the same is chosen, thereby determining the type of the device.
~lowever, ev~n in the same type of the device, assistant is ~iven only by adjustment of the pull spring in a case wh~re the increm~3nt of the moment of load is slight, and when the increment of the moment of load is too great to assist only by the adjustment of the pull spring, it is possible to assist a gate somewhat different in type (length, height and weight or moment of load) either by changing the point of articulation between the flicking arm rod 42 and the support arm 7 or changing the point of engagement of the base of the pull spring 29.
Third Embodiment Referring to Figures 12 and 13, the loading bo~ a of a motor truck as a kind of freight vehicles includes a floor plate 1 having an outer side edge 2. A-t its bottom edge 3, a side plate 4 is outwardly openably hinged to the qide edge 2. An interlicking mechanism _ for holding the side plate in equilibration by being resiliently pulled down-wardiy and sidewise of the floor plate by a pull spring comprises two upper and lower actuating connecting rods 59 and 60 and is twice-foldably articulated to a point on the 8~ZB
outer surface 5 of the side plate and to the lower portion 8 of a support arm 7 downwardly projected from the underside 6 of the floor plate. Such interlocking mechanism b may be operated to open or close the side plate of the loading box of the motor truck. The upper end of the upper actuating connecting rod 59 is articulated at 61 to a point on the outer surface 5 of the side plate while the lower end thereof is articulated at 62 to the upper end of a lower actuating connecting rod 60, the lower end 63 of which is in turn articulated at 64 to the lower portion 8 of the support arm.
Further the lower end 66 of a flicking arm rod 65 is articula-ted to the upper portion of the support arm 7 by means of a resilient torsion shaft 76, and the opposite ends 71 and 72 of a control connecting rod 70 are articulated at 73 and 74 to the upper portion 68 of the flicking arm rod 6S and the intermediate portion 69 of the lower actuating connecting rod 60, respectively.
When the side plate of the motor truck is opened closed under no-load condition by operating the interlocking mechanism for holding the side plate in equilibration by being resiliently pulled downwardly and sidewise of the floor plate by the pull spring which comprises two upper and lower actuating connecting rods and is twice-foldably articulated to a point on the outer surface of the side plate and to the lower portion of the support arm downwardly projected from the underside of the floor plate, the pull spring may some-times be broken duxing the operation because it is directly connected to the interlocking mechaniqm.
~ Such breakage of the spring may be prevented by the prèsent mechanism.
In this embodiment, the upper end of the upper actuating connecting rod is articulated to a point on the outer .. -: . ~ - . - , ~ .
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surface of the side plate while the lower end thereof is articulated to the upper end of the lower actuating connecting rod, the lower end of which is in turn articulated to the lower portion of the support arm. Further, the lower end of the flicking arm rod is arti~ulated to the upper portion of the support arm by means of the resilient torsion shaft, and the opposite ends of the control connecting rods are articula-ted to the upper portion of the flicking arm and the inter-mediate portion of the lower actuating connectin~ rod, respectively, whereafter the standard moment of load is first determined, and then a resilient torsion shaft matching the same is chosen, thereby determining the type of the device.
Fourth Embodiment ~eferring to Figures 1~ to 16, the loading box a of the motor truck as a kind of freight vehicles includes a floor plate 1 having an outer side edge 2. At its bottom edge 3, a side plate 4 is outwardly openably hinged to the side edge 2. An upper actuati.ng connecting rod 77 has the upper end 75 thereof articulated at 76 -to a point on the outer surface 5 of the side plate ~. Articula-ted at 81 to the lower end 78 of the upper actua-ting connecting rod 77 is the upper end 80 of a lower ac-tuating connecting rod 79, the lower ~nd 82 of which is in turn articulated at 86 to the lower side edge 85 of a support frame 84 downwardly projected from the underside 83 of the 100r plate 1. Articulated to the bottom edge 87 of the support frame 84 is the lower portion 89 of a flicking arm rod 88. The intermediate portion o the lower actuating connecting rod 79 and the intermediate portion of the flicking arm rod 88 are articulated at 91 and 92 to the opposite ends of a co:ntrol connecting rod 90. The base 95 of a spring resiliency adjusting rod 94 is engaged with the upper end 93 of the flicklng arm rod 88, and the spring _ g _ .. .
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resiliency adjusting rod 94 extends through the rearward -projected edge 96 of the support frame ~4. A set plate 99 is fitted to the threaded end portion 97 and fastened thereto by an adjust nut 98. A compression spring 102 is interposed between the inner surface 100 of the set plate 99 and the outer surface 101 of the rearward projected edge 96 on the support frame 84. Designated by 103 is a connecting beam to which the support frame 84 is connected by rivets 104.
Denoted by 105 is a support cylinder for the compression spring 102 and the bottom frame plate 106 of the support cylinder is fastened to the projected edge 96 by threaded rods 107. Reference numeral 108 designates and adjust hole, and reference numerals 109 and 110 denote mounting an~le rods.
~ ccording to the present embodiment, a compression spring is employed instead of a pull spring in the device for opening the side plate of the loading box on the motor truck under no-load condition which cornprises the interlocking mechanism for holding the side p:Late in equilibration by being resiliently pulled downwardly and sidewise of the floor plate by the spring, the interlocking mechanism consisting of two upper and lower actuating connecting rods and being twice-foldably articulated to a point on the outer surface of ~he side plate and to the lower portion of the support arm down-wardly projected from the underside of the floor plate. The compression spring has its spring resiliency adjustable simply by tightening or loosening the adjust nu-t on the threaded portion of the spring resiliency adjusting rod to thereby adjust the set plate to which the compression spring provided on the ad~usting rod is secured.
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in equilibration by being resiliently pulled downwardly and sidewise of the floor plate by a pull spring 29 comprises two upper and lower actuating connecting rods 30 and..31 and is twice-foldably articulated to a point on the outer surface 5 of the side plate and to the lower portion of a support arm 7 downwardly projected from the underside 6 of the floor plate.
More particularly, the upper end 32 of the upper actuating connecting rod 30 may be articulated at 33 to a point on the outer surface 5 of the side plate 4 while the lower end 34 thereof may be articulated at 35 to the upper end of the lower actuating connecting .rod 31, the lower end of which may in turn be articulated at 37 to the lower portion 8 of the afore-mentioned support arm 7. Further, a flicking arm rod 42 may have the lower end 39 thereof art`iculated to the upper portion ~0 of ~he ~s~lpport arm 7 and may have the upper end 43 engaged , with the forward ènd pulling portion 38 of -the pull spring 29.. A control connecting rod 47 may have~the opposite ends 48 and 49 thereof articulated at 45 and 46 to intermediate portions"50 and 5~ of the lower actuating connecting ~rod 31 and the flicking~arm rod 42,`respectively. F~lrther alternative-ly, the adjustment of the pull force of the pull spring 29 may be accomplishe~ by changing,the~points of ar-ticulation 52, 52,...... ~etween the flicking arm rod 42 and the support arm 7 or by changing the points of engagement 54, 54, ...... of the base 53 of the pull spring 29.
Designated by 55 is a rod by which the base 53 of the pull spring 29 is engaged. The base 53 may be engaged in one o~ engagement holes at po~ints of engagement 54, 54, p.rovided in a projected~support edge 57 formed on a support frame 56 discretely formed projectedly on the underside 6 of the floor plate 1, and then may be fastened by a nut 58.
When the side plate of the motor truck is opened or . -- 5 --, ~ B~
closed under no-load condition by operating the interlocking mechanism for holding the side plate in equilibration by being resiliently pulled downwardly and sidewise of the floor plate by the pull spring which comprises two upper and lower actuating connecting rods and es twice-foldably articulated to a point on the outer surface of the side plate and to the lower portion of the support arm downwardly projected from the underside of the floor plate, the pull spring may some-times be broken during the operation because it es directly connected to the interlocking mechanism.
Thus, in putting the device of this type into practice, it is necessary that an assistance may be provided even for other side plate which will undergo a different momen~ of loacl ~xerted on the upper actuating co~nected rod 30 oE the actuating mechanisrm b of the device, because the .`weight per meter, height, length, length and other factors ~.
of the same device vary within a certain range.
If the moment of load e.~erted on the actuating connecting rod 30 of this device :is greater than the standard moment of load and if the difference is small, it will offer no inconvenience simply to adjust the pull spring alone but, if the difference is great, the curve I of the reaction force resulting from the device will be widely deviated Erom the curve II of the rotational force resulting from the gravity of the side plàte, as seen en Figure 10.
Therefore, when the device of the present invention is used by being a-ttached to a side plate which will undergo a greate~ monlent of load than the standard moment of load of th.is device, it is possible to a9sist the spring by changing the point of articulation be-tween the flicking arm rod 42 and the support arm 7 as shown in Figure 7 .: - 6 -~ 38~28 or changing the point of engagement of the base of the pull spring as shown in Figure 8, in accordance with increase in the moment of load, thereby adjusting the operating angle of the pull spring.
Figure 11 is a graph illustrating the curve of the reaction force provided by changing the point of articulation of the flicking arm rod and adjusting the pull spring in order that the device may be attached to a side plate which will undergo a greater moment of load~
Thus, according to -the present device, the standard moment of load is first determined and a pull ~pring matching the same is chosen, thereby determining the type of the device.
~lowever, ev~n in the same type of the device, assistant is ~iven only by adjustment of the pull spring in a case wh~re the increm~3nt of the moment of load is slight, and when the increment of the moment of load is too great to assist only by the adjustment of the pull spring, it is possible to assist a gate somewhat different in type (length, height and weight or moment of load) either by changing the point of articulation between the flicking arm rod 42 and the support arm 7 or changing the point of engagement of the base of the pull spring 29.
Third Embodiment Referring to Figures 12 and 13, the loading bo~ a of a motor truck as a kind of freight vehicles includes a floor plate 1 having an outer side edge 2. A-t its bottom edge 3, a side plate 4 is outwardly openably hinged to the qide edge 2. An interlicking mechanism _ for holding the side plate in equilibration by being resiliently pulled down-wardiy and sidewise of the floor plate by a pull spring comprises two upper and lower actuating connecting rods 59 and 60 and is twice-foldably articulated to a point on the 8~ZB
outer surface 5 of the side plate and to the lower portion 8 of a support arm 7 downwardly projected from the underside 6 of the floor plate. Such interlocking mechanism b may be operated to open or close the side plate of the loading box of the motor truck. The upper end of the upper actuating connecting rod 59 is articulated at 61 to a point on the outer surface 5 of the side plate while the lower end thereof is articulated at 62 to the upper end of a lower actuating connecting rod 60, the lower end 63 of which is in turn articulated at 64 to the lower portion 8 of the support arm.
Further the lower end 66 of a flicking arm rod 65 is articula-ted to the upper portion of the support arm 7 by means of a resilient torsion shaft 76, and the opposite ends 71 and 72 of a control connecting rod 70 are articulated at 73 and 74 to the upper portion 68 of the flicking arm rod 6S and the intermediate portion 69 of the lower actuating connecting rod 60, respectively.
When the side plate of the motor truck is opened closed under no-load condition by operating the interlocking mechanism for holding the side plate in equilibration by being resiliently pulled downwardly and sidewise of the floor plate by the pull spring which comprises two upper and lower actuating connecting rods and is twice-foldably articulated to a point on the outer surface of the side plate and to the lower portion of the support arm downwardly projected from the underside of the floor plate, the pull spring may some-times be broken duxing the operation because it is directly connected to the interlocking mechaniqm.
~ Such breakage of the spring may be prevented by the prèsent mechanism.
In this embodiment, the upper end of the upper actuating connecting rod is articulated to a point on the outer .. -: . ~ - . - , ~ .
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surface of the side plate while the lower end thereof is articulated to the upper end of the lower actuating connecting rod, the lower end of which is in turn articulated to the lower portion of the support arm. Further, the lower end of the flicking arm rod is arti~ulated to the upper portion of the support arm by means of the resilient torsion shaft, and the opposite ends of the control connecting rods are articula-ted to the upper portion of the flicking arm and the inter-mediate portion of the lower actuating connectin~ rod, respectively, whereafter the standard moment of load is first determined, and then a resilient torsion shaft matching the same is chosen, thereby determining the type of the device.
Fourth Embodiment ~eferring to Figures 1~ to 16, the loading box a of the motor truck as a kind of freight vehicles includes a floor plate 1 having an outer side edge 2. At its bottom edge 3, a side plate 4 is outwardly openably hinged to the side edge 2. An upper actuati.ng connecting rod 77 has the upper end 75 thereof articulated at 76 -to a point on the outer surface 5 of the side plate ~. Articula-ted at 81 to the lower end 78 of the upper actua-ting connecting rod 77 is the upper end 80 of a lower ac-tuating connecting rod 79, the lower ~nd 82 of which is in turn articulated at 86 to the lower side edge 85 of a support frame 84 downwardly projected from the underside 83 of the 100r plate 1. Articulated to the bottom edge 87 of the support frame 84 is the lower portion 89 of a flicking arm rod 88. The intermediate portion o the lower actuating connecting rod 79 and the intermediate portion of the flicking arm rod 88 are articulated at 91 and 92 to the opposite ends of a co:ntrol connecting rod 90. The base 95 of a spring resiliency adjusting rod 94 is engaged with the upper end 93 of the flicklng arm rod 88, and the spring _ g _ .. .
` ., , ` .', ~ ~
~L~8~
resiliency adjusting rod 94 extends through the rearward -projected edge 96 of the support frame ~4. A set plate 99 is fitted to the threaded end portion 97 and fastened thereto by an adjust nut 98. A compression spring 102 is interposed between the inner surface 100 of the set plate 99 and the outer surface 101 of the rearward projected edge 96 on the support frame 84. Designated by 103 is a connecting beam to which the support frame 84 is connected by rivets 104.
Denoted by 105 is a support cylinder for the compression spring 102 and the bottom frame plate 106 of the support cylinder is fastened to the projected edge 96 by threaded rods 107. Reference numeral 108 designates and adjust hole, and reference numerals 109 and 110 denote mounting an~le rods.
~ ccording to the present embodiment, a compression spring is employed instead of a pull spring in the device for opening the side plate of the loading box on the motor truck under no-load condition which cornprises the interlocking mechanism for holding the side p:Late in equilibration by being resiliently pulled downwardly and sidewise of the floor plate by the spring, the interlocking mechanism consisting of two upper and lower actuating connecting rods and being twice-foldably articulated to a point on the outer surface of ~he side plate and to the lower portion of the support arm down-wardly projected from the underside of the floor plate. The compression spring has its spring resiliency adjustable simply by tightening or loosening the adjust nu-t on the threaded portion of the spring resiliency adjusting rod to thereby adjust the set plate to which the compression spring provided on the ad~usting rod is secured.
` ' - 10 ~
, .. . : .. ..
Claims (10)
1. A device for counterbalancing, during opening and closing, the weight of a side plate of a loading box on a motor truck, the side plate being outwardly openably hinged at its bottom edge to the outer side edge of the floor plate of the loading box, the device comprising an actuating mechanism con-nected to the side plate and including a four-rod linkage and spring means acting on this linkage to urge the side plate towards its closed position thereby counterbalancing the weight of the side plate, the actuating mechanism comprising: a support arm downwardly depending from the underside of said floor plate;
upper and lower actuating rods as a first and a second rod of said linkage, said first and second rods being articulated to each other at adjacent ends, the said upper rod being further articulated at an upper end thereof to a point on the outer surface of the side plate; wherein the said lower rod is further articulated at a lower end thereof to a first portion of said support arm; a flicking arm rod having a lower end thereof articulated to a second portion of said support arm and forming a third rod of said linkage; and a control connecting rod forming a fourth rod of said linkage and having opposite ends thereof articulated to and intermediate the ends of said flicking arm rod and to and intermediate the ends of said lower actuating rod, respectively; said spring means acting on said flicking arm rod.
upper and lower actuating rods as a first and a second rod of said linkage, said first and second rods being articulated to each other at adjacent ends, the said upper rod being further articulated at an upper end thereof to a point on the outer surface of the side plate; wherein the said lower rod is further articulated at a lower end thereof to a first portion of said support arm; a flicking arm rod having a lower end thereof articulated to a second portion of said support arm and forming a third rod of said linkage; and a control connecting rod forming a fourth rod of said linkage and having opposite ends thereof articulated to and intermediate the ends of said flicking arm rod and to and intermediate the ends of said lower actuating rod, respectively; said spring means acting on said flicking arm rod.
2. A device as claimed in claim 1 wherein the said first portion of the support arm is below the second portion thereof.
3. A device as claimed in claim 1 or claim 2 wherein the spring means comprises a torsion spring.
4. A device as claimed in claim 1 wherein the spring means comprises a tension spring connected between said flicking arm rod and said floor plate.
5. A device as claimed in claim 2 wherein the spring means comprises a tension spring connected between said flicking arm rod and said floor plate.
6. A device as claimed in claim 4 or 5 wherein the effect of the tension spring is adjustable by changing the point of articulation between the flicking arm rod and said support arm or by changing the point of engagement of an end of the spring.
7. A device as claimed in claim 1 or claim 2 including a spring resiliency adjusting rod having a base thereof engaged with the upper end of said flicking arm rod, said spring adjusting rod extending through an edge of said support arm, and a set plate fitted to a threaded end portion of said spring adjusting rod and fastened thereto by an adjusting nut, and a compression spring, constituting the spring means, interposed between the inner surface of said set plate and the edge of said support arm.
8. A device for opening and closing a side plate of a loading box on a motor truck under no-load condition, the side plate being outwardly openably hinged at its bottom edge to the outer side edge of the floor plate of said loading box, said device comprising an interlocking mechanism consisting of two upper and lower actuating connecting rods and twice-foldably articulated to a point on the outer surface of said side plate and to the lower portion of a support arm downwardly depending from the underside of said floor plate, said interlocking mechanism being resiliently pulled by a pull spring downwardly and sidewise of said floor plate to hold said side plate in equilibration, said upper actuating connecting rod having the upper end thereof articulated to said point on the outer surface of said side plate and having the lower end thereof articulated to the upper end of said lower actuating connecting rod, the lower end of said lower actuating connecting rod being articulated to the lower portion of said support arm, a flicking arm rod having the lower end thereof articulated to the upper portion of said support arm, the upper end of said flicking arm rod being engaged with the forward end pulling portion of said pull spring, and a control connecting rod having the opposite ends thereof articulated to intermediate portions of said lower actuating connecting rod and said flicking arm rod, respectively, the pull force of said pull spring being adjustable by changing the point of articulation between said flicking arm and said support arm or by changing the point of engagement of the base portion of said pull spring.
9. An apparatus for counterbalancing the force of gravity on a vehicle door, the door being hinged at its bottom edge to open outwardly from the vehicle, comprising:
a first connecting rod, an upper portion of which is pivotably connected to an outer surface of the door;
a support arm extending downwardly from the body of the vehicle;
a second connecting rod, a first end portion of which is pivotably connected to said support arm and a second opposite end portion of which is pivotably connected to a lower portion of said first connecting rod; and means pivotably connected intermediate the end portions of said second connecting rod for biasing the door toward a closed position, said biasing means including a flicking arm, a lower portion of which is pivotably connected to said support arm, a spring connected between the vehicle and an upper portion of said flicking arm, and a control arm, a first end portion of which is pivota-bly connected intermediate the upper and lower portions of said flicking arm, and a second end portion of which is connected to said second connecting rod.
a first connecting rod, an upper portion of which is pivotably connected to an outer surface of the door;
a support arm extending downwardly from the body of the vehicle;
a second connecting rod, a first end portion of which is pivotably connected to said support arm and a second opposite end portion of which is pivotably connected to a lower portion of said first connecting rod; and means pivotably connected intermediate the end portions of said second connecting rod for biasing the door toward a closed position, said biasing means including a flicking arm, a lower portion of which is pivotably connected to said support arm, a spring connected between the vehicle and an upper portion of said flicking arm, and a control arm, a first end portion of which is pivota-bly connected intermediate the upper and lower portions of said flicking arm, and a second end portion of which is connected to said second connecting rod.
10. The apparatus of claim 9, wherein said spring is a compression spring, and wherein said control arm is arcuate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA330,222A CA1088128A (en) | 1976-09-29 | 1979-06-20 | Device for opening and closing a side plate of a loading box on freight vehicles under no-load condition |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA262,284A CA1073500A (en) | 1976-09-29 | 1976-09-29 | Device for opening and closing a side plate of a loading box on freight vehicles under no-load condition |
| CA330,222A CA1088128A (en) | 1976-09-29 | 1979-06-20 | Device for opening and closing a side plate of a loading box on freight vehicles under no-load condition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1088128A true CA1088128A (en) | 1980-10-21 |
Family
ID=25668369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA330,222A Expired CA1088128A (en) | 1976-09-29 | 1979-06-20 | Device for opening and closing a side plate of a loading box on freight vehicles under no-load condition |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1088128A (en) |
-
1979
- 1979-06-20 CA CA330,222A patent/CA1088128A/en not_active Expired
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| MKEX | Expiry |