CA1090616A - Toothed transmission belt - Google Patents
Toothed transmission beltInfo
- Publication number
- CA1090616A CA1090616A CA273,003A CA273003A CA1090616A CA 1090616 A CA1090616 A CA 1090616A CA 273003 A CA273003 A CA 273003A CA 1090616 A CA1090616 A CA 1090616A
- Authority
- CA
- Canada
- Prior art keywords
- cable
- belt
- transmission means
- drive transmission
- teeth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
ABSTRACT
A toothed transmission belt adaptable for use with gears and sprockets featuring an elongated body portion com-prising at least one elongated flexible body element cable with a flexible belt-like covering and a series of teeth indented into the belt-like covering. The cable element acts as a guide to keep the belt from running off the gear or sprocket.
A toothed transmission belt adaptable for use with gears and sprockets featuring an elongated body portion com-prising at least one elongated flexible body element cable with a flexible belt-like covering and a series of teeth indented into the belt-like covering. The cable element acts as a guide to keep the belt from running off the gear or sprocket.
Description
This invention relates to toothed transmission drive belts such as timing gear belts, or the like, to provide for positive, non-slip drive. Toothed belts having teeth are already known. The usual type of timing belt known to the art requires pulleys having side flanges to prevent the belt from "walking offl' the pulleys.
According to the invention, a drive transmission means is provided comprising at least one cable, belt means surrounding said cable, and having a series of similar teeth formed therein, said belt means also including a plurality of guide portions extending between pairs of adjoining teeth forming an intermittent longitudinal belt guide means, and said teeth bcing formed along one side of the belt means and the other side of the belt means having a recessed portion positioned opposite each tooth. ~-DETAILED DESCRIPTION
Embodiments of the invention are illustrated in the accompanying drawings, in which:
FIGURE 1 is an elevational view;
PIGURE 2 is an enlarged perspective view of the belt of PIGURE 1 with parts cut away;
FIGURE 3 is an enlarged sectional detail along the lines 3-3 in FIGURE l;
FIGURE 4 is a view similar to FIGURE 2 illustrating a second form of transmission belt according to the invention;
FIGURE 5 is a sectional view along the lines 5-5 in FIGURE 4;
FIGURE 6 is an elevational view of the belt of FIGURE I in looped end facing relationship prior to being spliced into an endless loop with parts cut away;
.~
Fig~ 7 i8 an elevational view ~milar to Fig. 6 Jhowing a step in the splicing of the belt;
Figo 8 is an elevational view showing a further step in splicing which inclute~ the positioning of a bushing; and Fig. 9 i8 an elevational view ~howing the splice com~
pletet with the bushing installed.
Similar numerals refer to similar part~ throughout th several view8~ ~
The drive tran~mission means of the invention 20 com- -prises a main body portion fonmed by at least one eLongatet flexi- -ble bod~ element 22 which in turn comprises a central cable 241i madc up of multiple ~trands 26 of twi~ted ~teel, wire or other ~uitable material, and covering ~ean~ ~uch aJ a pl~tic cable ~acket 28, preferabl~ of soft flexible grade pol~ureth~ne, or nylon, which i~ e~truded or ~oldet around the cable 24 b~ any of the well known mean~ kn Q to the art, Belt means 30 m~y be extruded or lded over the cover- -ing mean~ 28 by any meanJ known to ~e art, or tke cable c0ver 28 and the belt ma~ be fashioned integrally as a combination cable covcr and belt 30~9 a~ Jh0wn in Fig~o 4 and 5.
~elt covering mean~ 30 and 30a are provided with indented portion~ 36 which form teeth 389 Thi~ provides for ~ firm yet flexible con~truction having ~trength and having teeth 38 which are adapted to mesh within the cavity 40 of the teeth 42 of toothed tran~mi~ion wheel mean~ Juch a~ pulley~ 44 to drivo the pulleyJ 44 who~e teeth 42 al~o fit within the cavitie~ 46 for~ed between the teeth 38 of the belt meanJ 30 or 30a~
The con~truction of the belt me~n~ 30 or 30a alJo ~rovides for belt guide mcans 48 adapted to fit groove me ns 50 ~ 6 in the pulley teeth 420 Guide mean~ 48 are made up of a series of arc-like belt guide portions 52 positioned in the cavitie~
46 between the belt teeth 38. Portion~ 52 have an arc-like configuration having a curved surface portion 54 concentric to the portion of cable 24 which it cover~. Thu~ the con~truc-tion comprising the integral belt and cover 30a or the belt 30 and ~acket 28 over the cable 24 with the teeth 38 and the belt guide portions 52 provide a transmission belt means 20 having a positive drive for a toothed pulley 44 and also having belt guide means 48 to prevent the belt from '~alking off" the pulley This construction eli~inate~ the neces~ity of expensive side flanges for the pulley 44 to hold the b-lt 20 in place, which also would require maintenance, and provides a strong, light-weight, ant e~tremely flexible belt 20 which nevertheles~ bas po~itive driveO
The belt may have a smooth ~ide 60 opposite the toothed side 62 of the belt means 30a, as shown in Fig. 4, or, if desired, reces~ed portionJ 64, opposite the indented teeth 38, may be pro-vided as in belt means 30 shown in Figo 20 It i8 to be under~tood that all belts of the inventionmay be m~de with one or more cables in side by ~ide relationship, as shown in either Fig. 2 or 4, and either with integral belts 3~a or with two or more layers of materi~l aa in belt 30, and with or without recessed portions 64.
Where there i~ a belt having two or more cables 24, belt duide means 48 and grooves 50 may be provided with relation to each cable 24 (see Fig. 5)~
~ D~ 1 6 The transmiJ~ion belt 20 iJ mude in selected length~
as desired for splicing into endless belts 20 of de~ired ~ize~.
The ~plice is made as illu~trated in Fig~o 6 through 9 of the drawings. In Fig. 6 a single length of a tran d ~ don belt 20 i~ shown whlch has be~n coiled around to form an endles~ loop with its ends 70 and 72 in end facing relation~hip. In Figs.
6 through 9 only the ends 70 and 72 of belt 20 are ~hown ~ince the balance of the belt 20 has been cut away in the-e figures.
In order to ~plice the belt 20 80 that the teeth 38 will fit ~ithin the cavities 40 of the pulleyJ 44, provision must be made to spac- the two teeth 38E ad~oining the splice -~
area 74 to be po~itioned properly with the splice 76 taking up the sp-ce required by one toothed belt Jection 38S. This i8 acco~pli~hed by providing a length of belt 20 baving nd ~or-tion~ 70 and 72 which include belt tooth soction- 38S whlch are overlapped to form the splice 76 of tbe as~e length as a ~ingle belt tooth ection 38So A belt tooth aection 38S ia defined a~ th~t x~ection or unit o belt 20 J~arting at tbe center line 78 of a cavity ~0 46 and ending at the center line 78 of the ne~t cavity 46 and including tbe tooth 38 poJitioaed bet~oen ~aid cavity 46 and center~ 78.
Let it be as~umed that bolt 20 would require 28 belt tooth section~ 38S to drive bet~een t~o pulleys 44 8~ in F~g.
1. Since the ~plice 76 must tske the place of one belt tooth Jection 38S and ~ince it i~ neceJssry for end~ 70 and 72 to overl~p in mak~ng the splice 76, the length of belt 20 neces-sarily would contain the Jplice 76 plus twenty-~even belt tooth sections 38S. The splice apace 76 is equal to t~o ~elt tooth ~ections 38S which are overl pped into the ~plice 760 Thus a length of belt for ~ ~ystem requiring twent~-eight tooth sections 38A would actuslly need twenty-nine tooth sec-tion~ 38A, or one estra to ~ake the splice 76.
The first step in splicing is to provide a proper size belt length, a~ de~cribedO The second step in splicing i~ to cut all of the ~acket 28 and cover material 30, or the belt material 30a, from the cable 24 to lay bare cable ends t 80 and 82 for the length of the end of tooth sectioQ~ 38S, as in Figo 7O The next ~tep i~ to tri~ ends 80 and 82 a small umount (between approximately 5 to 15 per cent of the end 80 and 82 lengths) as shown by the dotted lines at 84 and 86 in Figo 70 The next step is to overlep the cut cable end~ 80 and 82 between end tooth units 38E to make a splice sp-ce 74 of the length of a dngle belt tooth ~ection 38S, and tben a ~tep of placing an open ~plice bu~hing 88 over the overlapped cable ends 80 and 82, as ~hown in Figo 80 The final step of the ~plice is to crimp the open bu~hing 88 with a C~t~piQg tool or by oth¢r means to force bind the cable ends 80 and 82 together in positive arrangement by closing the bushing 880 The splice 76 will ride along over the pulleys 44 with the belt 20 and, if properly made wlth the ~plice 76 of the s#me length as a ~ingle belt tooth section, will ride over a pulley cavity 40O Thus the completed belt loop will pre~ent teeth 38 to the pulley cavities 40 with the exception of the one belt length comprising the splice. Since there wlll be a plurality of teeth engaging each pulley, Rkipping one space for ~ 6 1 6 the splice will not affect the efflci~ncy or u~eabilit~ of the belt~ of the invention.
In addition to the advantage~ alread~ entioned there i~ a further dvantage in the stre~gthening of the c-ble of thc invention in that the materi-l of the ~acket 28, which iJ e~truded or molded around the cable 24, wlll be fill d into the space~ 90 around the outer strand~ 26 of the cable 24 and may al~o be filled into all of the Jpace~ ~uch aJ 92 within ~ ',!, the cable 24 bet~een the trand~ 26 of the cable 24 which co~
munic-te with the outer surf-ce of the cable.
~ hile I h~ve de-cribet ~ invention in its preferred form there are many for~s that lt may take and I desire to be pr0tected for all fonms coming within the scope of the ~laim~
hereinbelow. ~ -~b
According to the invention, a drive transmission means is provided comprising at least one cable, belt means surrounding said cable, and having a series of similar teeth formed therein, said belt means also including a plurality of guide portions extending between pairs of adjoining teeth forming an intermittent longitudinal belt guide means, and said teeth bcing formed along one side of the belt means and the other side of the belt means having a recessed portion positioned opposite each tooth. ~-DETAILED DESCRIPTION
Embodiments of the invention are illustrated in the accompanying drawings, in which:
FIGURE 1 is an elevational view;
PIGURE 2 is an enlarged perspective view of the belt of PIGURE 1 with parts cut away;
FIGURE 3 is an enlarged sectional detail along the lines 3-3 in FIGURE l;
FIGURE 4 is a view similar to FIGURE 2 illustrating a second form of transmission belt according to the invention;
FIGURE 5 is a sectional view along the lines 5-5 in FIGURE 4;
FIGURE 6 is an elevational view of the belt of FIGURE I in looped end facing relationship prior to being spliced into an endless loop with parts cut away;
.~
Fig~ 7 i8 an elevational view ~milar to Fig. 6 Jhowing a step in the splicing of the belt;
Figo 8 is an elevational view showing a further step in splicing which inclute~ the positioning of a bushing; and Fig. 9 i8 an elevational view ~howing the splice com~
pletet with the bushing installed.
Similar numerals refer to similar part~ throughout th several view8~ ~
The drive tran~mission means of the invention 20 com- -prises a main body portion fonmed by at least one eLongatet flexi- -ble bod~ element 22 which in turn comprises a central cable 241i madc up of multiple ~trands 26 of twi~ted ~teel, wire or other ~uitable material, and covering ~ean~ ~uch aJ a pl~tic cable ~acket 28, preferabl~ of soft flexible grade pol~ureth~ne, or nylon, which i~ e~truded or ~oldet around the cable 24 b~ any of the well known mean~ kn Q to the art, Belt means 30 m~y be extruded or lded over the cover- -ing mean~ 28 by any meanJ known to ~e art, or tke cable c0ver 28 and the belt ma~ be fashioned integrally as a combination cable covcr and belt 30~9 a~ Jh0wn in Fig~o 4 and 5.
~elt covering mean~ 30 and 30a are provided with indented portion~ 36 which form teeth 389 Thi~ provides for ~ firm yet flexible con~truction having ~trength and having teeth 38 which are adapted to mesh within the cavity 40 of the teeth 42 of toothed tran~mi~ion wheel mean~ Juch a~ pulley~ 44 to drivo the pulleyJ 44 who~e teeth 42 al~o fit within the cavitie~ 46 for~ed between the teeth 38 of the belt meanJ 30 or 30a~
The con~truction of the belt me~n~ 30 or 30a alJo ~rovides for belt guide mcans 48 adapted to fit groove me ns 50 ~ 6 in the pulley teeth 420 Guide mean~ 48 are made up of a series of arc-like belt guide portions 52 positioned in the cavitie~
46 between the belt teeth 38. Portion~ 52 have an arc-like configuration having a curved surface portion 54 concentric to the portion of cable 24 which it cover~. Thu~ the con~truc-tion comprising the integral belt and cover 30a or the belt 30 and ~acket 28 over the cable 24 with the teeth 38 and the belt guide portions 52 provide a transmission belt means 20 having a positive drive for a toothed pulley 44 and also having belt guide means 48 to prevent the belt from '~alking off" the pulley This construction eli~inate~ the neces~ity of expensive side flanges for the pulley 44 to hold the b-lt 20 in place, which also would require maintenance, and provides a strong, light-weight, ant e~tremely flexible belt 20 which nevertheles~ bas po~itive driveO
The belt may have a smooth ~ide 60 opposite the toothed side 62 of the belt means 30a, as shown in Fig. 4, or, if desired, reces~ed portionJ 64, opposite the indented teeth 38, may be pro-vided as in belt means 30 shown in Figo 20 It i8 to be under~tood that all belts of the inventionmay be m~de with one or more cables in side by ~ide relationship, as shown in either Fig. 2 or 4, and either with integral belts 3~a or with two or more layers of materi~l aa in belt 30, and with or without recessed portions 64.
Where there i~ a belt having two or more cables 24, belt duide means 48 and grooves 50 may be provided with relation to each cable 24 (see Fig. 5)~
~ D~ 1 6 The transmiJ~ion belt 20 iJ mude in selected length~
as desired for splicing into endless belts 20 of de~ired ~ize~.
The ~plice is made as illu~trated in Fig~o 6 through 9 of the drawings. In Fig. 6 a single length of a tran d ~ don belt 20 i~ shown whlch has be~n coiled around to form an endles~ loop with its ends 70 and 72 in end facing relation~hip. In Figs.
6 through 9 only the ends 70 and 72 of belt 20 are ~hown ~ince the balance of the belt 20 has been cut away in the-e figures.
In order to ~plice the belt 20 80 that the teeth 38 will fit ~ithin the cavities 40 of the pulleyJ 44, provision must be made to spac- the two teeth 38E ad~oining the splice -~
area 74 to be po~itioned properly with the splice 76 taking up the sp-ce required by one toothed belt Jection 38S. This i8 acco~pli~hed by providing a length of belt 20 baving nd ~or-tion~ 70 and 72 which include belt tooth soction- 38S whlch are overlapped to form the splice 76 of tbe as~e length as a ~ingle belt tooth ection 38So A belt tooth aection 38S ia defined a~ th~t x~ection or unit o belt 20 J~arting at tbe center line 78 of a cavity ~0 46 and ending at the center line 78 of the ne~t cavity 46 and including tbe tooth 38 poJitioaed bet~oen ~aid cavity 46 and center~ 78.
Let it be as~umed that bolt 20 would require 28 belt tooth section~ 38S to drive bet~een t~o pulleys 44 8~ in F~g.
1. Since the ~plice 76 must tske the place of one belt tooth Jection 38S and ~ince it i~ neceJssry for end~ 70 and 72 to overl~p in mak~ng the splice 76, the length of belt 20 neces-sarily would contain the Jplice 76 plus twenty-~even belt tooth sections 38S. The splice apace 76 is equal to t~o ~elt tooth ~ections 38S which are overl pped into the ~plice 760 Thus a length of belt for ~ ~ystem requiring twent~-eight tooth sections 38A would actuslly need twenty-nine tooth sec-tion~ 38A, or one estra to ~ake the splice 76.
The first step in splicing is to provide a proper size belt length, a~ de~cribedO The second step in splicing i~ to cut all of the ~acket 28 and cover material 30, or the belt material 30a, from the cable 24 to lay bare cable ends t 80 and 82 for the length of the end of tooth sectioQ~ 38S, as in Figo 7O The next ~tep i~ to tri~ ends 80 and 82 a small umount (between approximately 5 to 15 per cent of the end 80 and 82 lengths) as shown by the dotted lines at 84 and 86 in Figo 70 The next step is to overlep the cut cable end~ 80 and 82 between end tooth units 38E to make a splice sp-ce 74 of the length of a dngle belt tooth ~ection 38S, and tben a ~tep of placing an open ~plice bu~hing 88 over the overlapped cable ends 80 and 82, as ~hown in Figo 80 The final step of the ~plice is to crimp the open bu~hing 88 with a C~t~piQg tool or by oth¢r means to force bind the cable ends 80 and 82 together in positive arrangement by closing the bushing 880 The splice 76 will ride along over the pulleys 44 with the belt 20 and, if properly made wlth the ~plice 76 of the s#me length as a ~ingle belt tooth section, will ride over a pulley cavity 40O Thus the completed belt loop will pre~ent teeth 38 to the pulley cavities 40 with the exception of the one belt length comprising the splice. Since there wlll be a plurality of teeth engaging each pulley, Rkipping one space for ~ 6 1 6 the splice will not affect the efflci~ncy or u~eabilit~ of the belt~ of the invention.
In addition to the advantage~ alread~ entioned there i~ a further dvantage in the stre~gthening of the c-ble of thc invention in that the materi-l of the ~acket 28, which iJ e~truded or molded around the cable 24, wlll be fill d into the space~ 90 around the outer strand~ 26 of the cable 24 and may al~o be filled into all of the Jpace~ ~uch aJ 92 within ~ ',!, the cable 24 bet~een the trand~ 26 of the cable 24 which co~
munic-te with the outer surf-ce of the cable.
~ hile I h~ve de-cribet ~ invention in its preferred form there are many for~s that lt may take and I desire to be pr0tected for all fonms coming within the scope of the ~laim~
hereinbelow. ~ -~b
Claims (7)
PROPERTY OR PRIVILEDGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Drive transmission means comprising at least one cable, belt means surrounding said cable, and having a series of similar teeth formed therein, said belt means also including a plurality of guide portions extending between pairs of adjoining teeth forming an intermittent longitudinal belt guide means, and said teeth being formed along one side of the belt means and the other side of the belt means having a recessed portion positioned opposite each tooth.
2. A drive transmission means as defined in claim 1 which further comprises a cable covering means surrounding the cable and the belt means covering said cable covering means.
3. Drive transmission means as claimed in claim 1 comprising a plurality of cables in side by side relationship.
4. Drive transmission means as claimed in claim 1 forming an endless loop comprising at least one splice which comprises cable ends and a crimped bushing.
5. Drive transmission means as claimed in claim 2 in which the cable is a flexible twisted strand cable and in which the cable covering means fills at least the spaces around the outer strands of the cable.
6. The drive transmission means as claimed in claim 5 in which the cable covering means fill substantially all spaces within the cable which communicate with the outer surface of the cable.
7. The method for splicing a drive transmission means as claimed in claim 1 comprising the steps of measuring the required length of the transmission means and providing one more than the required number of belt teeth, then peeling material away from the cable for the length of one tooth at each end of said transmission means, then shortening the exposed cable at each end thereof by cutting, then placing an expanded bushing over the two exposed ends and positioning the exposed ends within the bushing so that the splice will be relatively as long as a belt tooth, and then fixing the bushing to grasp the exposed cable ends to form an endless loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA273,003A CA1090616A (en) | 1977-03-02 | 1977-03-02 | Toothed transmission belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA273,003A CA1090616A (en) | 1977-03-02 | 1977-03-02 | Toothed transmission belt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1090616A true CA1090616A (en) | 1980-12-02 |
Family
ID=4108058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA273,003A Expired CA1090616A (en) | 1977-03-02 | 1977-03-02 | Toothed transmission belt |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1090616A (en) |
-
1977
- 1977-03-02 CA CA273,003A patent/CA1090616A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |