CA1154051A - Grit supply system for motor vehicles - Google Patents
Grit supply system for motor vehiclesInfo
- Publication number
- CA1154051A CA1154051A CA000359682A CA359682A CA1154051A CA 1154051 A CA1154051 A CA 1154051A CA 000359682 A CA000359682 A CA 000359682A CA 359682 A CA359682 A CA 359682A CA 1154051 A CA1154051 A CA 1154051A
- Authority
- CA
- Canada
- Prior art keywords
- grit
- pipe
- vehicle
- elbow
- diameter
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B39/00—Increasing wheel adhesion
- B60B39/02—Vehicle fittings for scattering or dispensing material in front of its wheels
- B60B39/04—Vehicle fittings for scattering or dispensing material in front of its wheels the material being granular, e.g. sand
- B60B39/08—Vehicle fittings for scattering or dispensing material in front of its wheels the material being granular, e.g. sand the dispensing being effected by fluid means
- B60B39/086—Vehicle fittings for scattering or dispensing material in front of its wheels the material being granular, e.g. sand the dispensing being effected by fluid means dispensing being effected by gas
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Road Repair (AREA)
Abstract
-- A grit supply system for motor vehicles --Abstract For making possible more economical use of grit and com-pressed air, a grit supplying system for motor vehicles has at least one grit box and one or more air nozzles, of which each is joined up with an air supply which may be put into operation and turned off from within the vehicle. The air nozzle is pla-ced within a guiding duct having two arms. One arm of the gui-ding duct is joined up with the lower end of one such grit box while the other, second end is joined up with a grit pipe for directing grit onto the road. The blowing nozzle has its air outlet cross-section stretching as far as a position within the second arm of the guiding duct.
Description
. . , ~, I
D.~ f the in~ve-- t lon (i) Field to which invention relates The'present invention ~s with respect to a grittin~ system ¦
l for road vehicles with at least one grit box whose grit may be ¦ run out onto the road through one or more air nozzles supplied with air under pressure.
(ii) The prior art A system on these lines is to be seen in the Germarl Offen-legungsschrift specification 2,800,709,in the case of which the grit is to be run out onto the road, generally speaking ove~ the full breadth of the vehicle under the control of an ice sensing unit and dependent on the operation of the vehicle braking system. Because o thc great breadth ovcr which the grit is placed on the road by thi.s earli.er system,the grit or sand and.
the cor,npressed air are likely to be used up relativel,y quic}:ly so that the range of t'he system woul.d seem to be limi.ted to a short distance along the road. German specification 2,800,709 l ' A"~
do~i ]~c~ cl~l) d~L~ C~: ~c~, ti~ (3c~s~
~in~s ol t:]le l)o~lc-" ~ut ~o~ would se~m clc~l]- t~lat .l)e ,1~3reat breadth over ~ icl~ the grit is placed on the road ~Jo-lld 'I .
se~m lo make a generally ~peakin~ comple~ nozzle system necessc~-xy. A further silortcomin~ of the system of this German speci- ¦
!, fication is that, because the grittillg system is dePendent on the ice sensiJlg system, tile gritting system may not be used urlder ¦ the direct control of the driver, something which would hardly ~ seem to make road safety any greater, because the old system would not be able to be used in many cases in which, in the opi-nion of the drlver, such use was necessary.
Short outline of the invention ~ . . ..
Taking this earlier system as a starting point the purpose of the present invention is for this reason that of taking care of the shortcomings of the prior art systems and designing a gritting system of the sort noted which makes possible economi-cal use of grit and compressed air and is not only simple and straightforward in design and troublefree in operation but fur-thermore may be used by the driver directly at those times when this use is thought to be necessary.
1~ For effecting this purpose the alr nozzle, which is joined by way of an air llne with a compressed air supply, which is a~le to be pùt into and out of operation, is placed in the di-rection of air supply in a guiding duct, which is joined up by way o one arm with an outlet placed at the lower end of the grit box while it is joined up by way of a further arm with a grit pipe, its air outlet cross-section running as far as the arm, joined up with the grit pipe, of the guiding duct.
The design and p]acing of the ai~ nozzle in the guiding duct which is joined up directly on the grit box, makes certain I that at ~he free ai~ outlet cross-section of the air nozzle , z 11~05 . `
.
i ~ ~ C` l ` (' ~ 5 ~ C1'. ~ 1 i t , '` 1 i ~} ~ 9 out c,f t1~, g~it hoi; lntO the cluic~inc~ c3uct, such grit then ~c~inc7 a~]c to be trc~ sL~ortecl Wlt 1l a sma~l amoullt of air and at a desired low ; rate, througll lhe ~rit pipe. The measures of the present inven-~I tion make possibe, as may be seen, troublefree transport - a~
the desired low rates - of the grit through the grit pipe and Il for this reason makes possible very troublefree and economical operation. The guiding duct itself has the effect of stopping ` ¦l any uncontrolled running of grit out of the grit box and for 10 ¦¦ this reason makes possible simple control of the gritting ope-~¦ ration by turning on or turning off the air supply system. This ¦I may usefully be done, that is to say controlled, from insidethe vehicle so that the gritting system may be put into opera-tion whenever desired by the driver, this greatly increasing road safety. The grit pipe, supplied with a great enough amount of grit by way of the air nozzle, may have its outlet end direc-ted towards the wheel track, that is to say the track along which the vehicle wheels are moved, this being responsible for a use-ful effect inasfar as only small amounts of grit are needed for producing the de~ired friction or gripping effect in the case of the wheel in question. The useful effects which may be produced with the invention are for this reason to be seen more specially in very economical use of the grit and of the compressed air.
Further developments and forms of the invention of good effect will be seen in the dependent claims and in the account now to be given of working examples of the invention.
List of fi~ures These working examples will now be made clear in detail using the fiyures.
Figure 1 is a block schematic of a gritting system for a private automohi'e.
` ~5~5~ 1 }`ic,~ a ~ of t}~ ~ui~ 7 d~ t ~1avil~a al~ o~i]~.
Ficlure 3 is a diagral~natic ~iew of one Iorm of t}~e systeln Ma-kll1g lt clear how the sys~em Inay be iixed on and ir, 1 a pri~te automobile with a rear wheel drive~.
I Figure 4 is a view, by way of example, of the seal of the grit hose at an opening in the vehicle's bodywork.
Figure 5 is a block schematic of a gritting system for use with ¦l a truck.
~ Figure 6 is a view of one system for fixing a grit box on a 1 truck.
J ¦ Figure 7 is a view of a system, by way of example, for heating ¦ the grit hose.
Detailed account of working_e amples _f he invention In figure 1 the back driven wheels 1 and 2 of a private automobile are numbered 1 and 2, each wheel having a grit supply hose 5 or flexible pipe, by way of which grit may be run onto the track of the wheel 1 and 2, that is to say onto the strip of road along which the wheel is moved, th~ direction of grit motion from hose 5 onto the road being ih the form of a cone 15, the breadth of the cone at its lower end being at least equal to that of the wheel with which it is used. The grit material is best in the form of dried sand, free of any undesired substances, with a grain size of 0.5 to 1.5 mm. Each grit hose 5 is supplied with grit from its own grit box 6, the grit being transported by way of blowing or compressed air through the grit hose 5. For this purpose each grit box 6 has an outlet part at its lower side which is best of conical form and which is joined up with the grit hose 5 in question by way of a guiding duct 17, in which a blowing or compressed air nozzle is placed, to be seen at po-sition 8, and which is joined with a compressed air supply b~
_ 4 _ 11S~5~
. . .
, .
4VS~
way of a compressed air line 9. In the working example to beseen in the figures each grit hose 5 has its own compressed air supply, making use, in the working example pictured, of a small compressor 18 powered by an electric motor l9 getting current from the vehicle battery 20. The electric motors l9 of the two compressors 18 are preferably able to be controlled together from inside the vehicle using switch 21 in the current supply line and placed for example somewhere near or on the vehicle dashboard or near the driver's seat.
As will be seen from FIG. 2, blowing nozzle 8 is simply formed by a length of pipe having its free air outlet end 22 pointing in the direction of grit transport and disposed in the guiding duct 17. This duct is formed by a piece of pipe with two arms at an angle to each other. The nozzle 8 extends into the elbow of duct 17 past the vertical stretch 23 and into the horizontal arm 24 or stretch (joined to the grit hose 5~ of duct 17. The size of the length of pipe forming the nozzle 22 is best such that the free outlet end is at the s]ope 25 of the grit within the guiding duct 17, that is to say the position at which the grit comes to rest in the duct. This makes certain that even small amounts of air at a low speed are enough for blowing the loose grit into the grit hose 5. Because oE the injector effect new grit is moved along the system to take the place of the grit transported by the blowing air. Because the air outlet cross--section 22 is placed in the arm 24, joined with the grit hose 5, of the guiding duct 17 is is possible at the same time to make certain that there is no loss of compressed air into the grit box 6. As has been made clear by tests, a useful effect is frequently to be produced if the grlt box 6 is shut off by an air-tight cover 26 .
:- ~
. -, d~lct 17 flon1 an u~u~ ht iotc) a ~o~izGn~al ciirec-~ioi~
to say the ~ac~ th~lt t~,e g~ldil1~ duct 17 is up~ ht: w}(-~-c it `1 is joined witl~ the box and ti1en ~ecoMes }~o~ ontal has the ~l effect of stopping any uncontrolled outlet of yrit frGm grit box 6 when the compxessed air is turned off so that control is made simpler. The pipe len~th forming blowing no~zle 8 is at such a slo~e as furthermore may be seen from figùre 2 in rela~ ¦
~ ~i tion to`the axis of arm 24, joined with grit hose 5, of the gui-¦ ding duct 17 that the free air outlet cross-section 22 or end ¦ is directed do~nwards at a slope, this being responsible for a ¦~ smooth take-up of grit or sand at the natural slope 25 and a ¦ high level of swirling or eddying of the air as it goes up against ~ the inner pipe face.
15 I In the case of a gritting system desi~Y~ for a private auto-mobile and based on figure 1 an air supply rate of about 30 li-tersiminute at a pressure of 0.1 to 0_5 atmospheres gage is all that is necessary. The compressors 18 with their electric motor 19 may for this reason be generally small in si~e and readily powered from the vehicle s battery. The diameter of the pipe length, forming the blowing nozzle ~, may be one third of the diameter of the guiding duct 17 or of grit hose 5, that is to say the ratio between the two diameters is 1 to 3. With a 4 millimeter nozzle and a 0.5 inch duct high-level operatiorl of the system was produced on testing.
The hose 5 for the grit is best such that it may readily be bent to be in line with the form of the vehicle's bodywork so that it may readily be fixed in position. Grit hose 5 may (see figure 3~ have its free outlet end 27 at such a slope thar the freely moving grit in a cone 15 is directed between 1 wheel 1 or 2 and the road. Gener~lly all that is necessary is I . I
-` 115~L05:~ -lor grit ~o b~ put on t}1e road in frol~L o~ the~ drivcn wi)ee~s.
llo~cvcr it is furthel-more rcadily possible for a furtl!er ~rit ' hose 5 to be piaced on the vehicle poin~ing between the wheel and the road to the back of the wheel, this being ~hen used o~
5 li driving backwards. The hose 5 is, as will furthermore be seen from figure 3, cut generally vertically at its end, so that its end face i5 sloping in relation to its own axis, this making ¦Icertain that the grit coming out of the hose is directed in the Idesired ~irections. For making the grit hoses 5 shorter, the grit box 6 in question may be placed near the wheel in question~ In the case of front wheel drive vehicles the grit boxes may best be placed in the engine compartment generally over the front !¦ wheel suspension. In the case of rear wheel drive vehicles the grit boxes 6 are best placed in the trunk at the back of the ve-t5 hicle, the compressors 16 being housed in the trunk as well. Thebest design of grit boxes 6 is one using plastics moldings, the outline of the boxes being the same as that of the bodywork on which the boxes are fixed, as will be seen in figure 3 diagramma-ticallyv in which the outline of the box 6 is the same as that of the part 28 of the bodywork covering the vehicle's wheel.
In the case of the working example of figure 3 the grit hose S placed running through an opening 29, to be made in bodywork 28 covering the wheel, when the system is put on the vehicle, so that the grit hose goes frorn the inside of the trunk into the space within the fender. For sealing off the opening 29, which may ben~de by drilling, it is possible to make use of a rubber grommet 30 (see figure 4) slipped onto hose 5 and having lips 31 tightly fixed against the edges of opening 29. It would further-more be possible for grommet 30 to be molded onto hose 5 itself.
In the case of trucks the vehicle will generally have its own compressed air supply, this supp~y systeln having (see ~iaur,--'05~
l~S~(~5~
5) a compressed air bottle 32 joined up in parallel with the compressed air bottle of the vehicle's compressed air system by way of supply lines 33. Gompressed air bottle 32 may be simply made of such a size that all grit hoses or pipes 5 may be supplied from it. For controlling the air supply rate there is a pressure control and pressure shut off valve 34, which is best solenoid controlled and to which air pressure lines 9 go from pressure bottle 32 and to air blowing or pressure nozzles 8. This valve 34 may be simply supplied with current from the vehicles's battery 20. In the current supply line a switch 21 is placed, the switch being able to be used by the driver within the vehicle so that the gritting system may readily be put into opera-tion and turned off as may be desired.
It is best for one grit box 6 to be placed on each side of the vehicle. For supporting these grit boxes 6 i-t is possible (see FIG. 6) to have a support frame 36 which is itself supported under the load-platform 35 of the truck. The grit box 6 is turningly supported on frame 36 so as to be able to be turned outwards for filling after taking off a cover 26. In the working example pictured in the figure, a hinge 37 is used for this purpose for fixing the grit box 6 at the lower cross-piece of support frame 36. Turning motion of the box is limi-ted by way of a locking pin 38 which is fixed to the grit box 6 and comes up against the support frame 36. For keeping the box in the normal operation position use may be made of a pin 40 having a nosepiece 39, the pin being able to be run through a hole in a leg of support frame 36 so that its front end goes into a locking groove of a side wall of the grit box 6 in question.
Each of the driven wheels 1 to 4 has its own grit pipe 5 which is best made in the form of a flexible hose. he hoses may be placed running along the inner side of the fenders, not to ' l~t` Seell in ~-~c~t:~ l iJ1 figl3-c '" as rar (,s anti-splcls~ a}~
~ ced at t~1e lo~er ~c~l1de1- e~gc. ~n the c~ce o~ tt~o ~heels placed sideby side or) the same a~le, as in the present case, eac~l of lll the gl-it bv~es 6 pl~ced on Gne side of the vehicle has two outlet~, leach joined up with a guiding duct 17 runl1iny to a grit hose 5.
he design ~nd positioning of the blowing nozzles 8 is on the same lines as given in fiyure 2, the diameter ratio ~etween the blowing nozzles 8 and the guiding duct 17 being about 2 to 3.
~ I In the case of an 8 mlllimeter nozzle and a 0.5 inch duct hi.gh ~ level operation has been produced in tests with.an air pressure of about 1 to 1.5 atmospheres gage. - .
¦ Normally the grit forced through the grit pipe or hose 5 ¦ keeps i.ts outlet end 27 clear; However, for stopping.any building ¦ up of ice formed by splashed-up water or sludge at the outlet end of grit pipe 5 in the case of specially rough conditions of use, it has turned out to be useful for the grit pipe 5 to be heated completely or, preferably, only at its outlet end 27. In the case of the working exarnple of the invention to be seen in figure 7 a resistance heating system is used taking the form of integrated heating coils 42 wi~hin the flexible hose forming the grit pipe 5. Such a resistance heating system may best be supp-lied with current from the vehicle battery, a switch being pla-ced in the current supply circuit so that it may be used by the driver within the vehicle. It would how~ever be readily possible for the grit pipe 5 to be simplv heated by forcing hot air through lt, for example from the vehicle heating system. Furthermore it . would be possible for the grit pipes 5 or hoses to be heated by forcing hot exhaust gases coming in by way of the air nozzles 8 so that the pipes 5 would be completely heated on only heated in part. Such exhaust gases would be taken from the vehicle's exhaust system and, if necessary, cornpressed by compressor 19.
~.J ~ 5~
115405~ , ~ thouc-~h 013ly a srnal.l nulllicr oL spccially p]efer]-ed wor-king exarll;c~lcs of ~he i.nvention has bee3i detai.led here, the in- I
~', vention is in no way to be limited by such examples. For example, !
!i l ~ as a compressed air supply i.t would furt}lerrTIore be possi.~le to 5 Ij make use of a compressed air bottle, having a fillinc] valve so ~¦ that such a bottle may be filled with compressed air at any ¦l gasoline filling station.
.
D.~ f the in~ve-- t lon (i) Field to which invention relates The'present invention ~s with respect to a grittin~ system ¦
l for road vehicles with at least one grit box whose grit may be ¦ run out onto the road through one or more air nozzles supplied with air under pressure.
(ii) The prior art A system on these lines is to be seen in the Germarl Offen-legungsschrift specification 2,800,709,in the case of which the grit is to be run out onto the road, generally speaking ove~ the full breadth of the vehicle under the control of an ice sensing unit and dependent on the operation of the vehicle braking system. Because o thc great breadth ovcr which the grit is placed on the road by thi.s earli.er system,the grit or sand and.
the cor,npressed air are likely to be used up relativel,y quic}:ly so that the range of t'he system woul.d seem to be limi.ted to a short distance along the road. German specification 2,800,709 l ' A"~
do~i ]~c~ cl~l) d~L~ C~: ~c~, ti~ (3c~s~
~in~s ol t:]le l)o~lc-" ~ut ~o~ would se~m clc~l]- t~lat .l)e ,1~3reat breadth over ~ icl~ the grit is placed on the road ~Jo-lld 'I .
se~m lo make a generally ~peakin~ comple~ nozzle system necessc~-xy. A further silortcomin~ of the system of this German speci- ¦
!, fication is that, because the grittillg system is dePendent on the ice sensiJlg system, tile gritting system may not be used urlder ¦ the direct control of the driver, something which would hardly ~ seem to make road safety any greater, because the old system would not be able to be used in many cases in which, in the opi-nion of the drlver, such use was necessary.
Short outline of the invention ~ . . ..
Taking this earlier system as a starting point the purpose of the present invention is for this reason that of taking care of the shortcomings of the prior art systems and designing a gritting system of the sort noted which makes possible economi-cal use of grit and compressed air and is not only simple and straightforward in design and troublefree in operation but fur-thermore may be used by the driver directly at those times when this use is thought to be necessary.
1~ For effecting this purpose the alr nozzle, which is joined by way of an air llne with a compressed air supply, which is a~le to be pùt into and out of operation, is placed in the di-rection of air supply in a guiding duct, which is joined up by way o one arm with an outlet placed at the lower end of the grit box while it is joined up by way of a further arm with a grit pipe, its air outlet cross-section running as far as the arm, joined up with the grit pipe, of the guiding duct.
The design and p]acing of the ai~ nozzle in the guiding duct which is joined up directly on the grit box, makes certain I that at ~he free ai~ outlet cross-section of the air nozzle , z 11~05 . `
.
i ~ ~ C` l ` (' ~ 5 ~ C1'. ~ 1 i t , '` 1 i ~} ~ 9 out c,f t1~, g~it hoi; lntO the cluic~inc~ c3uct, such grit then ~c~inc7 a~]c to be trc~ sL~ortecl Wlt 1l a sma~l amoullt of air and at a desired low ; rate, througll lhe ~rit pipe. The measures of the present inven-~I tion make possibe, as may be seen, troublefree transport - a~
the desired low rates - of the grit through the grit pipe and Il for this reason makes possible very troublefree and economical operation. The guiding duct itself has the effect of stopping ` ¦l any uncontrolled running of grit out of the grit box and for 10 ¦¦ this reason makes possible simple control of the gritting ope-~¦ ration by turning on or turning off the air supply system. This ¦I may usefully be done, that is to say controlled, from insidethe vehicle so that the gritting system may be put into opera-tion whenever desired by the driver, this greatly increasing road safety. The grit pipe, supplied with a great enough amount of grit by way of the air nozzle, may have its outlet end direc-ted towards the wheel track, that is to say the track along which the vehicle wheels are moved, this being responsible for a use-ful effect inasfar as only small amounts of grit are needed for producing the de~ired friction or gripping effect in the case of the wheel in question. The useful effects which may be produced with the invention are for this reason to be seen more specially in very economical use of the grit and of the compressed air.
Further developments and forms of the invention of good effect will be seen in the dependent claims and in the account now to be given of working examples of the invention.
List of fi~ures These working examples will now be made clear in detail using the fiyures.
Figure 1 is a block schematic of a gritting system for a private automohi'e.
` ~5~5~ 1 }`ic,~ a ~ of t}~ ~ui~ 7 d~ t ~1avil~a al~ o~i]~.
Ficlure 3 is a diagral~natic ~iew of one Iorm of t}~e systeln Ma-kll1g lt clear how the sys~em Inay be iixed on and ir, 1 a pri~te automobile with a rear wheel drive~.
I Figure 4 is a view, by way of example, of the seal of the grit hose at an opening in the vehicle's bodywork.
Figure 5 is a block schematic of a gritting system for use with ¦l a truck.
~ Figure 6 is a view of one system for fixing a grit box on a 1 truck.
J ¦ Figure 7 is a view of a system, by way of example, for heating ¦ the grit hose.
Detailed account of working_e amples _f he invention In figure 1 the back driven wheels 1 and 2 of a private automobile are numbered 1 and 2, each wheel having a grit supply hose 5 or flexible pipe, by way of which grit may be run onto the track of the wheel 1 and 2, that is to say onto the strip of road along which the wheel is moved, th~ direction of grit motion from hose 5 onto the road being ih the form of a cone 15, the breadth of the cone at its lower end being at least equal to that of the wheel with which it is used. The grit material is best in the form of dried sand, free of any undesired substances, with a grain size of 0.5 to 1.5 mm. Each grit hose 5 is supplied with grit from its own grit box 6, the grit being transported by way of blowing or compressed air through the grit hose 5. For this purpose each grit box 6 has an outlet part at its lower side which is best of conical form and which is joined up with the grit hose 5 in question by way of a guiding duct 17, in which a blowing or compressed air nozzle is placed, to be seen at po-sition 8, and which is joined with a compressed air supply b~
_ 4 _ 11S~5~
. . .
, .
4VS~
way of a compressed air line 9. In the working example to beseen in the figures each grit hose 5 has its own compressed air supply, making use, in the working example pictured, of a small compressor 18 powered by an electric motor l9 getting current from the vehicle battery 20. The electric motors l9 of the two compressors 18 are preferably able to be controlled together from inside the vehicle using switch 21 in the current supply line and placed for example somewhere near or on the vehicle dashboard or near the driver's seat.
As will be seen from FIG. 2, blowing nozzle 8 is simply formed by a length of pipe having its free air outlet end 22 pointing in the direction of grit transport and disposed in the guiding duct 17. This duct is formed by a piece of pipe with two arms at an angle to each other. The nozzle 8 extends into the elbow of duct 17 past the vertical stretch 23 and into the horizontal arm 24 or stretch (joined to the grit hose 5~ of duct 17. The size of the length of pipe forming the nozzle 22 is best such that the free outlet end is at the s]ope 25 of the grit within the guiding duct 17, that is to say the position at which the grit comes to rest in the duct. This makes certain that even small amounts of air at a low speed are enough for blowing the loose grit into the grit hose 5. Because oE the injector effect new grit is moved along the system to take the place of the grit transported by the blowing air. Because the air outlet cross--section 22 is placed in the arm 24, joined with the grit hose 5, of the guiding duct 17 is is possible at the same time to make certain that there is no loss of compressed air into the grit box 6. As has been made clear by tests, a useful effect is frequently to be produced if the grlt box 6 is shut off by an air-tight cover 26 .
:- ~
. -, d~lct 17 flon1 an u~u~ ht iotc) a ~o~izGn~al ciirec-~ioi~
to say the ~ac~ th~lt t~,e g~ldil1~ duct 17 is up~ ht: w}(-~-c it `1 is joined witl~ the box and ti1en ~ecoMes }~o~ ontal has the ~l effect of stopping any uncontrolled outlet of yrit frGm grit box 6 when the compxessed air is turned off so that control is made simpler. The pipe len~th forming blowing no~zle 8 is at such a slo~e as furthermore may be seen from figùre 2 in rela~ ¦
~ ~i tion to`the axis of arm 24, joined with grit hose 5, of the gui-¦ ding duct 17 that the free air outlet cross-section 22 or end ¦ is directed do~nwards at a slope, this being responsible for a ¦~ smooth take-up of grit or sand at the natural slope 25 and a ¦ high level of swirling or eddying of the air as it goes up against ~ the inner pipe face.
15 I In the case of a gritting system desi~Y~ for a private auto-mobile and based on figure 1 an air supply rate of about 30 li-tersiminute at a pressure of 0.1 to 0_5 atmospheres gage is all that is necessary. The compressors 18 with their electric motor 19 may for this reason be generally small in si~e and readily powered from the vehicle s battery. The diameter of the pipe length, forming the blowing nozzle ~, may be one third of the diameter of the guiding duct 17 or of grit hose 5, that is to say the ratio between the two diameters is 1 to 3. With a 4 millimeter nozzle and a 0.5 inch duct high-level operatiorl of the system was produced on testing.
The hose 5 for the grit is best such that it may readily be bent to be in line with the form of the vehicle's bodywork so that it may readily be fixed in position. Grit hose 5 may (see figure 3~ have its free outlet end 27 at such a slope thar the freely moving grit in a cone 15 is directed between 1 wheel 1 or 2 and the road. Gener~lly all that is necessary is I . I
-` 115~L05:~ -lor grit ~o b~ put on t}1e road in frol~L o~ the~ drivcn wi)ee~s.
llo~cvcr it is furthel-more rcadily possible for a furtl!er ~rit ' hose 5 to be piaced on the vehicle poin~ing between the wheel and the road to the back of the wheel, this being ~hen used o~
5 li driving backwards. The hose 5 is, as will furthermore be seen from figure 3, cut generally vertically at its end, so that its end face i5 sloping in relation to its own axis, this making ¦Icertain that the grit coming out of the hose is directed in the Idesired ~irections. For making the grit hoses 5 shorter, the grit box 6 in question may be placed near the wheel in question~ In the case of front wheel drive vehicles the grit boxes may best be placed in the engine compartment generally over the front !¦ wheel suspension. In the case of rear wheel drive vehicles the grit boxes 6 are best placed in the trunk at the back of the ve-t5 hicle, the compressors 16 being housed in the trunk as well. Thebest design of grit boxes 6 is one using plastics moldings, the outline of the boxes being the same as that of the bodywork on which the boxes are fixed, as will be seen in figure 3 diagramma-ticallyv in which the outline of the box 6 is the same as that of the part 28 of the bodywork covering the vehicle's wheel.
In the case of the working example of figure 3 the grit hose S placed running through an opening 29, to be made in bodywork 28 covering the wheel, when the system is put on the vehicle, so that the grit hose goes frorn the inside of the trunk into the space within the fender. For sealing off the opening 29, which may ben~de by drilling, it is possible to make use of a rubber grommet 30 (see figure 4) slipped onto hose 5 and having lips 31 tightly fixed against the edges of opening 29. It would further-more be possible for grommet 30 to be molded onto hose 5 itself.
In the case of trucks the vehicle will generally have its own compressed air supply, this supp~y systeln having (see ~iaur,--'05~
l~S~(~5~
5) a compressed air bottle 32 joined up in parallel with the compressed air bottle of the vehicle's compressed air system by way of supply lines 33. Gompressed air bottle 32 may be simply made of such a size that all grit hoses or pipes 5 may be supplied from it. For controlling the air supply rate there is a pressure control and pressure shut off valve 34, which is best solenoid controlled and to which air pressure lines 9 go from pressure bottle 32 and to air blowing or pressure nozzles 8. This valve 34 may be simply supplied with current from the vehicles's battery 20. In the current supply line a switch 21 is placed, the switch being able to be used by the driver within the vehicle so that the gritting system may readily be put into opera-tion and turned off as may be desired.
It is best for one grit box 6 to be placed on each side of the vehicle. For supporting these grit boxes 6 i-t is possible (see FIG. 6) to have a support frame 36 which is itself supported under the load-platform 35 of the truck. The grit box 6 is turningly supported on frame 36 so as to be able to be turned outwards for filling after taking off a cover 26. In the working example pictured in the figure, a hinge 37 is used for this purpose for fixing the grit box 6 at the lower cross-piece of support frame 36. Turning motion of the box is limi-ted by way of a locking pin 38 which is fixed to the grit box 6 and comes up against the support frame 36. For keeping the box in the normal operation position use may be made of a pin 40 having a nosepiece 39, the pin being able to be run through a hole in a leg of support frame 36 so that its front end goes into a locking groove of a side wall of the grit box 6 in question.
Each of the driven wheels 1 to 4 has its own grit pipe 5 which is best made in the form of a flexible hose. he hoses may be placed running along the inner side of the fenders, not to ' l~t` Seell in ~-~c~t:~ l iJ1 figl3-c '" as rar (,s anti-splcls~ a}~
~ ced at t~1e lo~er ~c~l1de1- e~gc. ~n the c~ce o~ tt~o ~heels placed sideby side or) the same a~le, as in the present case, eac~l of lll the gl-it bv~es 6 pl~ced on Gne side of the vehicle has two outlet~, leach joined up with a guiding duct 17 runl1iny to a grit hose 5.
he design ~nd positioning of the blowing nozzles 8 is on the same lines as given in fiyure 2, the diameter ratio ~etween the blowing nozzles 8 and the guiding duct 17 being about 2 to 3.
~ I In the case of an 8 mlllimeter nozzle and a 0.5 inch duct hi.gh ~ level operation has been produced in tests with.an air pressure of about 1 to 1.5 atmospheres gage. - .
¦ Normally the grit forced through the grit pipe or hose 5 ¦ keeps i.ts outlet end 27 clear; However, for stopping.any building ¦ up of ice formed by splashed-up water or sludge at the outlet end of grit pipe 5 in the case of specially rough conditions of use, it has turned out to be useful for the grit pipe 5 to be heated completely or, preferably, only at its outlet end 27. In the case of the working exarnple of the invention to be seen in figure 7 a resistance heating system is used taking the form of integrated heating coils 42 wi~hin the flexible hose forming the grit pipe 5. Such a resistance heating system may best be supp-lied with current from the vehicle battery, a switch being pla-ced in the current supply circuit so that it may be used by the driver within the vehicle. It would how~ever be readily possible for the grit pipe 5 to be simplv heated by forcing hot air through lt, for example from the vehicle heating system. Furthermore it . would be possible for the grit pipes 5 or hoses to be heated by forcing hot exhaust gases coming in by way of the air nozzles 8 so that the pipes 5 would be completely heated on only heated in part. Such exhaust gases would be taken from the vehicle's exhaust system and, if necessary, cornpressed by compressor 19.
~.J ~ 5~
115405~ , ~ thouc-~h 013ly a srnal.l nulllicr oL spccially p]efer]-ed wor-king exarll;c~lcs of ~he i.nvention has bee3i detai.led here, the in- I
~', vention is in no way to be limited by such examples. For example, !
!i l ~ as a compressed air supply i.t would furt}lerrTIore be possi.~le to 5 Ij make use of a compressed air bottle, having a fillinc] valve so ~¦ that such a bottle may be filled with compressed air at any ¦l gasoline filling station.
.
Claims (6)
1. A grit-dispensing system for a highway type automotive vehicle comprising:
at least one grit box disposed on each of a pair of opposite sides of a body of said vehicle, each grit box having a cover closing the top thereof and an outlet at the bottom thereof;
a grit-dispensing pipe connected to said outlet and having a discharge end disposed above the path of a respective wheel and ahead of the latter in the direction of travel of the vehicle, said grit-dispensing pipe having a vertical stretch proximal to said outlet, an elbow connected to said vertical stretch and a horizontal stretch extending away from said elbow, said elbow being positioned so that grit in the respective grit box is held back by said elbow and forms a sloping surface between said elbow and said horizontal stretch;
a blowing nozzle extending into and through said elbow and terminating at said sloping surface, said blowing nozzle being formed as a pipe section sloping downwardly into said horizontal stretch and having an air discharge axis in-cluding an acute angle with the axis of said horizontal stretch substantially at said surface;
a source of compressed air on said body; and operator controlled switch means effective to selec-tively connect said source to said blowing nozzle whereby grit from said grit box is dispensed onto the respective path in response to actuation by a vehicle operator.
at least one grit box disposed on each of a pair of opposite sides of a body of said vehicle, each grit box having a cover closing the top thereof and an outlet at the bottom thereof;
a grit-dispensing pipe connected to said outlet and having a discharge end disposed above the path of a respective wheel and ahead of the latter in the direction of travel of the vehicle, said grit-dispensing pipe having a vertical stretch proximal to said outlet, an elbow connected to said vertical stretch and a horizontal stretch extending away from said elbow, said elbow being positioned so that grit in the respective grit box is held back by said elbow and forms a sloping surface between said elbow and said horizontal stretch;
a blowing nozzle extending into and through said elbow and terminating at said sloping surface, said blowing nozzle being formed as a pipe section sloping downwardly into said horizontal stretch and having an air discharge axis in-cluding an acute angle with the axis of said horizontal stretch substantially at said surface;
a source of compressed air on said body; and operator controlled switch means effective to selec-tively connect said source to said blowing nozzle whereby grit from said grit box is dispensed onto the respective path in response to actuation by a vehicle operator.
2. The system defined in claim 1 wherein said blowing nozzle has a diameter which is substantially 1/3 to 2/3 of the diameter of said horizontal stretch, the pressure of said source being less than 1.5 atmosphere gauge.
3. The system defined in claim 2 wherein said pressure is 0.1 to 0.3 atmosphere gauge when said nozzle has a diameter which is substantially 1/3 of the diameter of said horizontal stretch, and wherein said pressure is 1 atmosphere gauge when said nozzle has a diameter which is substantially 2/3 of the diameter of said horizontal stretch.
4. The system defined in claim 1 further comprising means for heating at least a portion of said pipe.
5. The system defined in claim 4 wherein the last mentioned means includes a resistance heating system for said pipe.
6. The system defined in claim 4 wherein said last mentioned means includes means for introducing a heated gas into said pipe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792936333 DE2936333A1 (en) | 1979-09-08 | 1979-09-08 | SPREADING DEVICE FOR ROAD VEHICLES |
| DEP2936333.5 | 1979-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1154051A true CA1154051A (en) | 1983-09-20 |
Family
ID=6080367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000359682A Expired CA1154051A (en) | 1979-09-08 | 1980-09-05 | Grit supply system for motor vehicles |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0025203A1 (en) |
| CA (1) | CA1154051A (en) |
| DE (1) | DE2936333A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT374140B (en) * | 1982-06-11 | 1984-03-26 | Cervinka Franz | SAND SPREADING DEVICE FOR MOTOR VEHICLES |
| AT403559B (en) * | 1995-01-11 | 1998-03-25 | Goldmann Norbert | SPREADER |
| ES2184919T3 (en) * | 1996-06-27 | 2003-04-16 | Zf Lemfoerder Metallwaren Ag | UPPER FIXING SUPPORT FOR WHEEL SUSPENSIONS IN A VEHICLE. |
| AT403679B (en) * | 1996-06-28 | 1998-04-27 | Goldmann Norbert | AIR-OPERATED DISCHARGE DEVICE FOR A SPREADER |
| DE19718567A1 (en) * | 1997-05-03 | 1998-11-05 | Pfister Gmbh | Dosing device |
| AT405499B (en) * | 1998-02-16 | 1999-08-25 | Goldmann Norbert | SEAL FOR PISTON-CONTROLLED DOSING DEVICES IN SPREADERS |
| ITNA20130037A1 (en) * | 2013-07-03 | 2015-01-04 | Individuale Di Savino Sergio | SYSTEM ASSEMBLED ON VEHICLES WITH TIRES THAT SEND A HIGH PRESSURE AND TEMPERATURE AIR JET ON THE ROAD, CLEANING IT FROM WATER, ICE OR VISCIDUME, RECOVERING SO LOST OF THE LOST ROAD FRICTION |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7341358U (en) * | 1974-05-16 | John Rudolf | Sand spreader for motor vehicles when there is a risk of black ice | |
| CH288051A (en) * | 1950-12-23 | 1952-12-31 | Curta Marcel | Safety sandblaster. |
| DE878605C (en) * | 1951-04-08 | 1953-06-05 | Bosch Gmbh Robert | Compressed air spreader for motor vehicles |
| US2727770A (en) * | 1951-09-26 | 1955-12-20 | Harry C Davis | Jet sander for vehicles |
| US2999711A (en) * | 1959-04-24 | 1961-09-12 | Leonard J Sturmer | Anti-skid sanding device |
| FR1310449A (en) * | 1962-01-05 | 1962-11-23 | Daragon Et Cie | Semi-automatic sandblasting device for motor trucks or other vehicles |
| FR2054747A5 (en) * | 1969-07-25 | 1971-05-07 | Moratille Et Duchateau | |
| DE2330865A1 (en) * | 1973-06-16 | 1975-01-16 | Hermann Glaser | Vehicle traction aid granular spreader - uses compressed air to supply exhaust gas heated grit to chute in front of wheels |
| DE7606180U1 (en) * | 1976-03-01 | 1976-07-15 | Lohmueller, Karlheinz, 8000 Muenchen | VEHICLE COMPRESSOR SPREADER |
| DE2639515A1 (en) * | 1976-09-02 | 1978-03-09 | August Hoch | Grit spraying fitting for car - has grit reservoirs in bank of four in boot and uses spare wheel as pressurised air reservoir |
| AT353621B (en) * | 1977-04-26 | 1979-11-26 | Cervinka Franz | SAND SPREADING DEVICE FOR MOTOR VEHICLES |
-
1979
- 1979-09-08 DE DE19792936333 patent/DE2936333A1/en not_active Ceased
-
1980
- 1980-09-02 EP EP80105205A patent/EP0025203A1/en not_active Ceased
- 1980-09-05 CA CA000359682A patent/CA1154051A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2936333A1 (en) | 1981-04-16 |
| EP0025203A1 (en) | 1981-03-18 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |