GB1602143A - Tread belt drive system - Google Patents
Tread belt drive system Download PDFInfo
- Publication number
- GB1602143A GB1602143A GB2353578A GB2353578A GB1602143A GB 1602143 A GB1602143 A GB 1602143A GB 2353578 A GB2353578 A GB 2353578A GB 2353578 A GB2353578 A GB 2353578A GB 1602143 A GB1602143 A GB 1602143A
- Authority
- GB
- United Kingdom
- Prior art keywords
- link
- tumbler
- links
- cog
- driving
- 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
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/12—Arrangement, location, or adaptation of driving sprockets
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Transmissions By Endless Flexible Members (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Description
(54) TREAD BELT DRIVE SYSTEM
(71) We, RUSTON-BUCYRUS LIMI
TED, a British company of Excavator Works,
Lincoln LN6 7DJ, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a drive system for propelling large machinery and other heavy mobile equipment, comprising endless tread belts made up of identical links joined together by pins and adapted to be mounted on tumblers and to engage rollers which support the weight of the equipment.
The invention consists in a link for such belts; in the belt; and in the complete drive system.
Tread belt drive systems useful for propelling large machinery and other heavy mobile equipment which are forerunners of the present invention are shown in U.S. Patent Specification Nos. 2,530,579; 2,727,794 and 3,680,928. In those specifications a drive system is described in which the number of links which are driven by the tumbler teeth at any given moment of time is less than the number of links which are wrapped about the tumbler.
This system has the advantage of providing for even wear of the links and is achieved by having the pitch angle between the tumbler teeth larger than the pitch angle of the links.
The pitch angle of the tumbler teeth is the angle at the centre of the tumbler which is subtended by a line drawn from the midpoint of one tooth to the midpoint of an adjacent tooth. The pitch angle of the links is the angle at the centre of the tumbler that is subtended by a line drawn from the centre of the pivot pin connection of one link to the pivot pin connection of an adjacent link. A detailed discussion of pitch angles and their measurement appears in U.S. Patent Specification
No. 2,727,794.
The described prior art type of tread belt drive system provides a practical and effective way of propelling large excavating equipment.
However, the use of such systems is not without problems. One problem which can occur
is that of breakage of the links or the tumbler teeth. This can happen when a link being driven by a tumbler tooth is forced radially outward of the tumbler in response to the driving forces. When this happens there can be a loss of proper driving engagement between the tumbler tooth and the link; and as the link falls back towards the tumbler the link may improperly strike a tumbler tooth and cause a fracture of either one or both of the members.
Another problem which can occur is that due to the wear of the bearing surfaces of the tumbler and the links. Such wear can cause the pitch angle of the links to increase and the pitch angle of the tumbler to de
crease. When the pitch angle of the links exceeds the tumbler pitch angle the necessary driving relationship of the tumbler to the links is lost and the links or tumbler must be rebuilt or replaced.
Still another problem which can occur is the jamming or breaking of the tread belt when stones or dirt become lodged between the driving surfaces of the tumbler teeth and the link.
Despite the above described problems and the fact that tread belt drive systems are generally noisy and rough operating, these systems remain the most practical way of propelling large excavators and other heavy mobile machinery. Therefore, a need exists for an improved system which provides a smoother, quieter operation and eliminates the problems which accompany the use of prior drive systems.
The main features of this invention are set out severally as claims 1 to 10 of the statement of claims that ends this specification.
In a preferred embodiment, the driving surfaces of the link cog portion have an involute gear rack profile and are positioned below the roller and tumbler rim engaging surfaces of the link close to the link bottom and the level of the link connecting pin centres.
The teeth of the preferred drive and idler tumblers have an involute gear profile and points of driving engagement with the driving surfaces of the link cog portions remaining on the pitch circle or migrating towards the link bottom. As a result, as the link turns with the tumbler, the driving force upon the link does not create excessive torque about the link pins which might otherwise tend to lift the link out of mesh with the tumbler and cause the teeth or the links to be damaged.
In order to accommodate for the inevitable wear of the bearing surfaces of the links which
can cause the pitch angle of the links to increase and exceed the tumbler pitch angle, the link pin connections in the preferred form of the link are bushed for link connecting pins and the pins and bushings are hardened with the pin being slightly softer. Then as wear of the pins and bushings occurs and the link pitch angle increases, excessive link tumbler engagement error can be avoided by replacing the link pin and/or the bushings to once again obtain the correct link pitch angle.
The possibility of a tread belt of the preferred links being jammed or broken is reduced because an endless belt of the preferred links is self-cleaning. As the belt of preferred links travels about the tumblers the teeth of the tumblers enter between the links and the distances between the link bottoms is increased due to the angle between the links and the tumbler teeth so that any stones or dirt lodged between the driving surfaces of the tumbler teeth and the links are removed.
In addition to its other advantages an endless belt of the preferred links provides a smootheroperating system because the roller- and tumbler-ring-engaging surfaces are constructed so that when the links are joined together a nearly continuous roller- and tumbler-rimengaging surface is provided. The engaging surfaces extend longitudinally fore and aft of the link edges so that when the links are joined together the openings between the tumblerand roller-engaging surfaces of adjacent links
are staggered on opposite sides of the cog portion so that a tumbler-rim or a roller will not run over openings on both sides of the cog at the same time. The use of teeth of an involute gear profile and cogs with driving surfaces of an involute gear track profile results in a gear and rack type action which results in smoother operation.
The following description relates to the accompanying drawings which show by way of illustration only a preferred embodiment of the invention.
In the drawings: Figure 1 is a plan view of the preferred tread belt link of the present invention;
Figure 2 is an end view of the link of Figure 1;
Figure 3 is a view in cross section of the tread belt link taken on the line 3-3 of
Figure 1;
Figure 4 is a view in cross section of the tread belt link taken on the line 4-4 of
Figure 1;
Figure 5 is a view in cross section of the tread belt link taken on the line 5-5 of Figure 1;
Figure 6 is a transverse view of the tread belt link of Figure 1 with parts broken away and in section so as to have a portion thereof viewed on the line 6-6 of Figure 1;
Figure 7 is a plan view of two tread belt links connected;
Figure 8 is a partial view of the drive system showing a link belt, a drive tumbler, and a roller;
Figure 9 is a view of a tumbler, whether a drive tumbler or an idler tumbler;
Figure 10 is a view in cross section of the tumbler taken on the line 10--10 of Figure 9;
Figure 11 is a view in cross section of a link and roller taken on the line 11-11 of Figure 8;
Figure 12 is a view of a link and an idler tumbler with engaging surfaces in contact; and
Figure 13 is a view of a link cog and a tumbler tooth geometry.
In the drawings is shown a tread belt link 20. A number of such links 20 are joined together to form an endless ground-engaging tread belt; and a tread belt is disposed on each side of a machine such as an excavator or tractor. The belt passes under rollers that support the machine proper and is in mesh at one end of the belt with a drive tumbler 21 (as seen in Figure 8), and at the other end of the belt with an idler tumbler (not shown), to provide a drive system for propelling the machine along the ground.
For purposes of description, the direction of travel of the links will be called "longitudinal" and the direction across the link from one end to the other end will be called "transverse"; the ground engaging surface 22 of the link 20 will be termed the "bottom" of the link and the direction through the link from the ground engaging surface 22 will be termed "upward" even though the links will sometimes be "upside-down."
Referring now to Figure 1 to 7, the top of the link 20 has, a cog or cog portion 23 positioned medially of the link ends, and a pair of upwardly-facing, flat, tumbler- rim- and rollerengaging surfaces 24, located on each side of and directly adjacent to the cog portion 23.
The surfaces 24 extend longitudinally across the top of the link 20. The link 20 is further provided with a set of four connecting ears 25 which extend forwardly of the front edge of the link, and a set of two connecting ears 26 which extend rearwardly of the back edge of the link. One pair of ears 25 and one of ears 26 are located on each side of the cog portion 23 between the engaging surfaces 24 and the ends of the link. The links 20 are connected to one another to form an endless belt by the rearward connecting ears 26 of one link being inter-digited with the forward connecting ears 25 of the succeeding link, appropriate pins 27 being inserted in the openings to join the links together as seen in Figure 7. As seen best in Figure 3, all the connecting ears 25 and 26 are provided with pin openings 28; while the rearward connecting ears 26 are also provided with bushings 29. The connecting pins 27 are removably secured to the forward ears 25; but are sized to have relative movement within the bushing 29 of the rearward ears 26, the bushings 29 being designed to be replaced as they wear to re-obtain the correct link pitch angle. As the connecting pins 27 of the link 20 have no relative motion within the ears 25, so that the pin holes 28 in ears 25 will not wear, simple replacement of pins 27 and/or bushings 29 will correct any link pitch angle error that may be due to wear.
The endless belt of links 20 is mounted on a pair of spaced tumblers on the machine with the teeth 30 of the tumblers entrapped between the cogs 23 of adjacent links 20, as seen in
Figure 8 (in which only the drive tumbler 21 is shown). The drive tumbler 21 is mounted on the machine proper to be driven in a rotational direction to drive the belt, and the idler tumbler (not shown) is mounted in such a manner as to be driven by the belt.
The drive and idler tumblers are of similar configuration; and both are provided with a central shaft-receiving opening 32 and a circumferential rim 33 which presents a radially-outward-facing rolling surface 34 (seen best in Figure 10). Protruding radially outwardly from the rolling surface 34 is a plurality of teeth 30 forming a gear wheel.
As seen in Figure 8 the machine is supported by rollers 35 which also roll along and bear upon the surfaces 24. Turning to Figure 11, it is seen that the roller 35 has a rolling surface 36 that rolls along and bears upon the link surfaces 24, and a roller flange 37. The top of the cog 23 is lower than the tops of the tumbler-rim- and roller-engaging surfaces 24, thus allowing the roller flange 37 to guide the endless belt. Referring to Figure 12, which is a partial view of the idler tumbler, it is seen that it is the rolling surface 34 of the tumbler which rolls along and bears upon the surfaces 24 of the link 20.
Having completed a general description of the tread belt drive mechanism of the present invention, the links and tumblers of the especially preferred embodiment will now be described.
Turning first to Figures 1 and 5, it can be seen that the cog 23 is an integral part of the link 20 that commences at the ground-engaging surface 22 and extends upwardly. It has its greatest longitudinal length at the bottom of the link and tapers in an upward direction.
The taper is comprised of fore and aft driving surfaces 23a and 23b, which are of an involutegear rack-type profile which is dependent on the involute gear profile of the tumbler teeth.
The taper of the driving surfaces 23a and 23b of the link 20 is determined by the angle
E seen only in Figure 9. The angle E is measured between the intersection of angles
S and A. The angle S is equal to one-half of the pitch angle Y of the tumbler, being an angle measured between the midpoints of two adjacent teeth of the tumbler and having its apex at the centre of the tumbler. The angle
A is equal to the pressure angle of the involuteformed tooth 30 (e.g. in a 20% involute, the angle A would be 20 ). Angle A is measured off the line created by angle B as shown in
Figure 9. Angle B is an angle having its apex at the centre of the tumbler and measured from the centre of a tooth to the point on the edge of the tooth on the tumbler pitch circle. Angle B varies with changes in tooth thickness. The angle A originates on the tooth pitch circle that angle B was measured to.
Referring now to Figure 13, it can be seen that the thickness T of the cog portion 23 of the link 20 is measured longitudinally between the driving surfaces 23a, 23b and from points originating on the tumbler pitch cirde with the engaging surface 24 of the link in contact with the tumbler-rim rolling surface 34. This thickness T and distance P between the centres of connecting pins of the link are determined together so as to allow the tumbler tooth 30 to be in contact with the cog driving surfaces 23a and 23b at the proper time and to minimize the travel distance of the tumbler tooth 30 from the cog driving surfaces 23a and 236 when the direction of tumbler rotation is reversed. (A detailed description of the measurement and significance of the link pitch angle and the tumbler pitch angle which are shown in Figure 13 can be found in U.S. Patent
Specification No. 2,727,794).
In the preferred embodiment of the links 20 the tumbler-rim- and roller-engaging surfaces 24 extend from a face 24a to an extension face 246, which extends beyond the link edge. This is seen best in Figures 1, 2, 4, 5 and 7. As seen in Figures 4 and 5, the faces 24a and24b extend upwardly from the ground engaging surface 22 the full depth of link 20 to the surface 24.
Thus, when two links 20 are attached to one another as part of an endless tread belt as shown in Figure 7, the engaging surfaces 24 of adjacent links present a nearly continuous surface for engagement with the tumbler rim rolling surfaces 34 and rollers 35 under which the links pass. As seen only in Figure 7, the nearly continuous path of tumbler and roller-engaging surfaces 24 formed by adjacent links is interrupted by openings 38 between the faces 24a and 24b of adjacent links and a tumbler tooth receiving opening 39. The openings 38 are staggered on opposite sides of the cog 23 so that the tumbler rolling surface 34 does not run over the openings 38 on both sides of the cog 23 at the same time. As a result, a smoother more efficient operation is obtained.
Returning to Figures 1 to 7, it is seen that in the preferred link a reinforcing rib 40 ex tends from each of the tumbler-rim and rollerengaging surfaces 24 to the end of the link to provide additional strength and durability.
In the especially preferred tread belt drive system of the invention, the tumbler teeth 30 are formed with an involute gear profile from the base circle radially outward to the tooth tip 31. The tooth 30 is also provided with a tip relief cut 31a to eliminate the interference between the tooth 30 and the cog driving faces 23a or 23b as the link 20 leaves the tumbler as shown at the top of Figure 8.
The tip relief 31a of the tooth reduces wear, as the tooth 30 does not slide appreciabIy along the link 20 as it leaves its tumbler. The use of an involute gear profile allows the tooth 30 to contact the link at a point below the surface 24 and to drive the link 20 on the pitch circle as shown in Figure 8.
Referring still to Figure 8, it can be seen that the distance between the trailing edge of one link and the leading edge of the next link is increased, as the links 20 pass around the tumbler, as compared to the distance between the link edges when the links 20 are on the ground. As this link distance is increased as the links 20 are guided onto the tumbler 21, and the tumbler 30 enters the space 39 (seen in
Figure 7) between the links, foreign material, such as stones and the sort, is ejected from between the links. This removal of foreign material is not as easily accomplished with conventional chain driven links as the material is forced into the chain and is retained by the bolted link to the chain. The same problem of foreign material removal is present in systems using conventional excavator links where the driving tang is located at the top of the link.
When the proper pitch angles are employed with components of the proper dimensions, the link-connecting pins 27 are located on the tumbler pitch circle when the engaging surfaces 24 and the rolling surfaces 34 are in contact
(best seen in Figure 12). As a given link 20 moves about the driving tumbler 21 to the top and to the point of driving action (the arrow seen in Figure 8), the link 20 tends to follow the pitch circle. Since the point of driving action and the pin centres are below the tumbler rolling surface 24, the links 20 are urged to briefly follow the tumbler rotation as the link breaks contact with associated tumbler teeth 30 and starts its run to the opposite end of the endless link belt. As a result, the link belt and teeth remain in proper mesh, and the problems of breakage that can occur when they are out of mesh are eliminated.
The tread belt drive system described provides a smoother and more efficient operation than that obtained with conventional tread belts and tumbler arrangements.
Although an especially preferred embodiment has been described in which the driving surfaces of the link have an involute gear rack profile and the driving teeth of the tumbler have an involute gear profile the invention is not so limited.
WHAT WE CLAIM IS:
1. A tread belt link comprising:
a) a ground engaging surface;
b) an integral cog portion positioned medially of the link ends and having fore and aft driving surfaces that face respectively to the front and rear of the link, each of said driving surfaces extending upwardly from the link bottom;
c) a pair of tumbler-engaging surfaces extending longitudinally across the top of the link one on each side of and extending above the cog portion; and
d) connecting ears extending fore and aft the link which have connecting pin openings with centres locating at a level which is in alignment with the driving surfaces.
2. A link as claimed in claim 1 in which the driving surfaces have an involute gear profile.
3. A tread belt link comprising:
a) a ground engaging bottom surface;
b) a top surfacing having a cog portion which is an integral part of the link and which is positioned medially of the link ends, said cog portion having fore and aft driving surfaces, each of which has an involute gear rack profile;
c) a pair of upwardly facing tumbler-rimand roller-engaging surfaces extending longitudinally across the top of the link, above the cog portion, one of said surfaces disposed adjacent to and on each side of the cog portion; and
d) connecting ears offset transversely from the cog portion and extending fore and aft of the link, said ears having connecting pin openings so that a plurality of links can be fastened together with pins to form an endless tread belt.
4. A tread belt link as claimed in claim 3, in which one of the tumbler engaging surfaces of the link extends forward of the link and the other extends aft of the link.
5. A tread belt comprising:
a) a ground engaging bottom surface;
b) a top surface having cog portion integral with said link, said cog portion having fore and aft driving surfaces, said fore and aft surfaces facing respectively to the front and rear of the link;
c) a pair of tumbler engaging surfaces integral with said link positioned one on each side of the cog portion which tumbler engaging surfaces rise above the top of the cog portion;
d) a first set of connecting ears arranged transversely across the front of the links; and
e) a second set of connecting ears arranged transversely across the rear of the link;
said ears being transversely spaced such that those along the front of one link will inter
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (13)
1. A tread belt link comprising:
a) a ground engaging surface;
b) an integral cog portion positioned medially of the link ends and having fore and aft driving surfaces that face respectively to the front and rear of the link, each of said driving surfaces extending upwardly from the link bottom;
c) a pair of tumbler-engaging surfaces extending longitudinally across the top of the link one on each side of and extending above the cog portion; and
d) connecting ears extending fore and aft the link which have connecting pin openings with centres locating at a level which is in alignment with the driving surfaces.
2. A link as claimed in claim 1 in which the driving surfaces have an involute gear profile.
3. A tread belt link comprising:
a) a ground engaging bottom surface;
b) a top surfacing having a cog portion which is an integral part of the link and which is positioned medially of the link ends, said cog portion having fore and aft driving surfaces, each of which has an involute gear rack profile;
c) a pair of upwardly facing tumbler-rimand roller-engaging surfaces extending longitudinally across the top of the link, above the cog portion, one of said surfaces disposed adjacent to and on each side of the cog portion; and
d) connecting ears offset transversely from the cog portion and extending fore and aft of the link, said ears having connecting pin openings so that a plurality of links can be fastened together with pins to form an endless tread belt.
4. A tread belt link as claimed in claim 3, in which one of the tumbler engaging surfaces of the link extends forward of the link and the other extends aft of the link.
5. A tread belt comprising:
a) a ground engaging bottom surface;
b) a top surface having cog portion integral with said link, said cog portion having fore and aft driving surfaces, said fore and aft surfaces facing respectively to the front and rear of the link;
c) a pair of tumbler engaging surfaces integral with said link positioned one on each side of the cog portion which tumbler engaging surfaces rise above the top of the cog portion;
d) a first set of connecting ears arranged transversely across the front of the links; and
e) a second set of connecting ears arranged transversely across the rear of the link;
said ears being transversely spaced such that those along the front of one link will inter
digit with those along the rear of an adjacent link, and having connection pin openings with centres located at a level beneath said tumbler engaging surface.
6. A link as claimed in claim 5 in which the fore and aft driving surfaces of the cog have an involute gear rack profile.
7. A tread belt drive system for a mobile piece of equipment, comprising:
a) a plurality of links joined together to form an endless tread belt, said links each having a bottom engaging surface, a top surface having a cog portion that is an integral part of the link positioned medially of the link ends, said cog portion having fore and aft driving surfaces, a pair of upwardly facing tumbler engaging surfaces which extend longitudinally across the top of the link exposed to on both sides of the cog portion, said tumbler engaging surfaces extending above the top of the cog portion, and connecting ears offset transversely from the cog portion extending fore and aft of the links for connection with successive links to make-up a complete tread belt, and
b) a drive and an idler tumbler each having a mounting hub; a rim supported from said hub with a pair of radially outward facing rolling surfaces that engage the tumbler engaging surfaces of the link and a set of driving teeth circumferentially spaced about the tumbler extending radially outward of the rirn to protrude into the openings between two adjacent links to contact the involute gear rack profile driving surfaces of the link cogs.
8. A tread belt system as claimed in claim 7 in which the link driving surfaces have an involute gear rack profile and the teeth have an involute gear profile.
9. An endless tread belt for heavy mobile equipment made up of a plurality of identical links joined together by link-connecting pins and adapted to be mounted on tumblers; in which each link has a ground-engaging bottom, and a top having a cog, or cog portion, positioned medially of the link ends, and having fore and aft driving surfaces; a pair of longitudinally-extending tumbler-rim and roller-engaging surfaces which extend above the cog are positioned on the top of the link, one on each side of the cog; and the links have fore and aft pin connections with the pin centre below the engaging surfaces in alignment with the driving surfaces.
10. A link for an endless tread belt, which link has a ground-engaging bottom, and a top having a cog positioned medially of the link ends with fore and aft driving surfaces; the top surface of the link also has two longitudinally-extending tumbler-rim and rollerengaging surfaces that extend above the cog and are positioned one on each side of the cog; and the link also has fore and aft pin connection with the pin centre at a level beneath the roller and tumbler rim engaging surfaces in alignment with the driving surfaces.
11. A tread belt link substantially as described with reference to the accompanying drawings.
12. A tread belt substantially as described with reference to the accompanying drawings.
13. A drive system for propelling large machinery and other heavy mobile equipment substantially as described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US86388077A | 1977-12-23 | 1977-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1602143A true GB1602143A (en) | 1981-11-04 |
Family
ID=25342000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2353578A Expired GB1602143A (en) | 1977-12-23 | 1978-05-26 | Tread belt drive system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5490728A (en) |
| CA (1) | CA1096425A (en) |
| GB (1) | GB1602143A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19920025A1 (en) * | 1999-04-27 | 2000-11-16 | Mannesmann Ag | Crawler track |
| DE10026084C1 (en) * | 2000-05-24 | 2001-08-09 | Atecs Mannesmann Ag | Drive turas |
| EP1151910A2 (en) * | 2000-05-03 | 2001-11-07 | Demag Mobile Cranes GmbH | Final drive for endless track unit |
| DE10113412A1 (en) * | 2001-03-20 | 2002-10-31 | Ekm Gmbh | Chain track running gear has chain wheel in disc form with cylindrical roll surface with radially protruding teeth located along center line and in contact with support surface of chain links extending in chain's running direction |
| GB2376007A (en) * | 2001-05-30 | 2002-12-04 | Stephen John Heard | Drive wheels for tracked vehicles |
-
1978
- 1978-05-26 GB GB2353578A patent/GB1602143A/en not_active Expired
- 1978-08-01 CA CA308,540A patent/CA1096425A/en not_active Expired
- 1978-08-31 JP JP10697878A patent/JPS5490728A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19920025A1 (en) * | 1999-04-27 | 2000-11-16 | Mannesmann Ag | Crawler track |
| DE19920025C2 (en) * | 1999-04-27 | 2001-03-08 | Mannesmann Ag | Crawler track |
| US6659573B1 (en) | 1999-04-27 | 2003-12-09 | Terex-Demag Gmbh & Co. Kg | Wheel and track for a crawler vehicle undercarriage |
| DE10022080C2 (en) * | 2000-05-03 | 2002-07-18 | Demag Mobile Cranes Gmbh & Co | Turas |
| DE10022080A1 (en) * | 2000-05-03 | 2001-11-15 | Atecs Mannesmann Ag | Turas |
| JP2002005267A (en) * | 2000-05-03 | 2002-01-09 | Demag Mobile Cranes Gmbh | Tumbler |
| EP1151910A2 (en) * | 2000-05-03 | 2001-11-07 | Demag Mobile Cranes GmbH | Final drive for endless track unit |
| US6595603B2 (en) | 2000-05-03 | 2003-07-22 | Demag Mobile Cranes Gmbh & Co. Kg | Drive sprocket wheel for a track vehicle |
| EP1151910B1 (en) * | 2000-05-03 | 2005-07-27 | Terex-Demag GmbH & Co. KG | Drive tumbler for an endless track unit |
| US6508524B2 (en) | 2000-05-24 | 2003-01-21 | Demag Mobile Cranes Gmbh & Co. Kg | Drive sprocket wheel |
| DE10026084C1 (en) * | 2000-05-24 | 2001-08-09 | Atecs Mannesmann Ag | Drive turas |
| DE10113412A1 (en) * | 2001-03-20 | 2002-10-31 | Ekm Gmbh | Chain track running gear has chain wheel in disc form with cylindrical roll surface with radially protruding teeth located along center line and in contact with support surface of chain links extending in chain's running direction |
| GB2376007A (en) * | 2001-05-30 | 2002-12-04 | Stephen John Heard | Drive wheels for tracked vehicles |
| GB2376007B (en) * | 2001-05-30 | 2004-09-15 | Stephen John Heard | Drive wheels |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1096425A (en) | 1981-02-24 |
| JPS5490728A (en) | 1979-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |