CA1147552A - Pivotally mounted bulldozer teeth assembly - Google Patents
Pivotally mounted bulldozer teeth assemblyInfo
- Publication number
- CA1147552A CA1147552A CA000363880A CA363880A CA1147552A CA 1147552 A CA1147552 A CA 1147552A CA 000363880 A CA000363880 A CA 000363880A CA 363880 A CA363880 A CA 363880A CA 1147552 A CA1147552 A CA 1147552A
- Authority
- CA
- Canada
- Prior art keywords
- blade
- teeth
- bulldozer
- frame
- hangers
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/7609—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
Abstract
TITLE
PIVOTALLY MOUNTED BULLDOZER TEETH ASSEMBLY
ABSTRACT OF THE DISCLOSURE
A set of ripping teeth projecting downwardly from a support frame which is pivotally secured to a bulldozer blade.
The frame extends downwardly from the pivotal support along the front of the blade with the teeth projecting beyond the lower edge thereof. As the bulldozer moves forwardly the teeth perform a ripping function in the same manner as teeth which are rigidly secured to the blade. However, as the bull-dozer moves rearwardly, the teeth and frames swing forwardly in a floating motion to prevent the teeth from fracturing and to allow the blade to perform a scraping function. In one em-bodiment the support frame includes a pair of tubular mounting sleeves formed at opposite ends of its upper edge. Mounting pins project from the outer ends of the mounting sleeves, and a mounting shaft extends between the inner ends of the mount-ing sleeves. The mounting pins and the mounting shaft are slidably received by spaced apart hangers which are releasably secured to the blade through blade mounted brackets. In an-other embodiment of the invention the frame includes a pair of end members each having an ear or a bracket formed at its up-per end which curves rearwardly toward the blade. Each brack-et releasably receives a respective hanger mounted on the up-per surface of the blade and projecting forwardly therefrom.
The hanger and brackets contain aligned bores through which pin is releasably inserted to pivotally secure the frame to the blade.
PIVOTALLY MOUNTED BULLDOZER TEETH ASSEMBLY
ABSTRACT OF THE DISCLOSURE
A set of ripping teeth projecting downwardly from a support frame which is pivotally secured to a bulldozer blade.
The frame extends downwardly from the pivotal support along the front of the blade with the teeth projecting beyond the lower edge thereof. As the bulldozer moves forwardly the teeth perform a ripping function in the same manner as teeth which are rigidly secured to the blade. However, as the bull-dozer moves rearwardly, the teeth and frames swing forwardly in a floating motion to prevent the teeth from fracturing and to allow the blade to perform a scraping function. In one em-bodiment the support frame includes a pair of tubular mounting sleeves formed at opposite ends of its upper edge. Mounting pins project from the outer ends of the mounting sleeves, and a mounting shaft extends between the inner ends of the mount-ing sleeves. The mounting pins and the mounting shaft are slidably received by spaced apart hangers which are releasably secured to the blade through blade mounted brackets. In an-other embodiment of the invention the frame includes a pair of end members each having an ear or a bracket formed at its up-per end which curves rearwardly toward the blade. Each brack-et releasably receives a respective hanger mounted on the up-per surface of the blade and projecting forwardly therefrom.
The hanger and brackets contain aligned bores through which pin is releasably inserted to pivotally secure the frame to the blade.
Description
~75~Z
BACKG~OUND OF THE INVENTION
Field of the Invention This invention relates to bulldozer blade attachments, and more particularly to a set of ripping or raking teeth which are pivotally secured to a bulldozer blade.
Description of the Prior Art Bulldozers having a planar, vertically movable blade secured to their forwared ends are commonly used in a variety of applications including ripping or raking in which a layer of rigid surfacing material i5 removed from an area, and grading in which the lower edge of the blade is scraped along a surface. During the ripping operatioin, ripping teeth have long been used to allow the blade to dig into the surfacing material. Although ripping teeth may be intergrally formed with the lower edge of the blade, in most instances the teeth are individually bolted on the lower edge of the blade to facilitate removal for the scraping operation and replacement of broken teeth. Although these teeth have gener-ally proven somewhat satisfactory for a ripping operation, they suffer from a number of serious shortcomings. The principal dis-advantage of bulldozer blades having conventional ripping teeth is the relatively large amount of time required to convert from a ripping or brush blade to a scraping blade. During a ripping operation after the surfacing material has been broken into pieces, the pieces must be removed from a surface and the surface leveled. With the ripping teeth in conventional use, the teeth must be first removed from the blade or else a sep-B
~ t7~arate bulldozer or dirt blade must be used for the grading operation.
Another problem associated with conventional ripping teeth is their inability to withstand rearward forces without fracturing. The ripping teeth generally project forwardly and downwardly from the lower edge of the bulldozer blade and are thus extremely sturdy in receiving forces from ln front of the blade since these forces act along the axis of the teeth. How-ever, forces imparted to the teeth from a rearward direction, such as when the bulldozer is moving in a reverse direction with the blade down, produce a force transverse to the longi-tudinal axis of the teeth which could easily fracture the teeth thereby necessitating time consuming and expensive re-placement. In summary, although conventional ripping teeth are generally satisfactory, they require an excessive period of time to convert from a ripping or brush blade blade to a scraping blade. Also, they are not sufficiently resistant to fracture by rearward forces.
Structures have been previously devised for pivot-ally securing a plurality of elongated members to a bulldozerblade. Examples of such devices are illustrated in U.S.
Patents No. 2,132,261; 2,262,415; 3,097,439; and 3,595,416.
However, these devices are not utilized to easily and quickly convert a conventional bulldozer blade to a ripping or brush blade. Also these devices are not both light in weight and sufficiently strong to withstand typically imposed loads.
Additionally, these prior art devices lack features which are essential for achieving various advantageous functions. For example, none of the prior art structures include means for positioning the elongated members so that they will not inter-fere with the use of the blade in a conventional manner.
Furthermore, some of these structures, such as that disclosed in U.S. Patent No. ~,262,415, employ mounting structures for the teeth which either interfere with use of the blade or are likely to be damaged when the teeth are removed from the blade.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a struc-ture for mounting a set of ripping teeth on a bulldozer blade which allows the blade to be easily and quickly converted be-tween a ripping blade and a scraping blade.
It is another object of the invention to provide a mounting structure which allows a set of ripping teeth to be added onto virtually any size and shape bulldozer blade.
It is still another object of the invention to pro-vide a mounting structure for a set of ripping teeth which does not interfere with the use of the blade and is not likely to be damaged when the teeth are removed from the blade.
It is a further object of the invention to provide a set of pivotally mounted ripping teeth which may be locked in-to an upwardly projecting position when the teeth are not to be used.
It is a still further object of the invention to provide a lightweight attachment to allow multi-purpose use of small and medium sized bulldozers which can thus be easily transported.
These and other objects of the invention are accomp-lished by a set of ripping teeth projecting from an integrally formed frame which is pivotally secured to the upper edge of the bulldozer blade along a transverse horizontal axis. In one embodiment, the frame is formed by two separatable sec-tions each of which terminates in a tubular mounting sleeve.Mounting pins project from the outer ends of the mounting 75~2 sleeves,. and a mounting shaft extends between the inner ends of the mGunting sleeves. The mounting pins and shaft are secured to hangers which are releasably supported by brackets mounted on the blade along the upper edge thereof. During the ripping operation the teeth project downwardly beyond the low-er edge of the blade so that the teeth dig into the under sur-face when the bulldozer moves forwardly. The frame is braced against transverse forces by guides projecting rearwardly from the sides of the frame along the sides of the blade. The teeth may be placed in an undeployed position by pivoting the frames upwardly where it is secured in place by a locking hook removably secured to the upper rear face of the blade and ex-tending around a frame member.
In a second embodiment, the frame includes a pair of side members having upper ends which terminate in respective brackets. The brackets curve rearwardly to receive respective forwardly projecting hangers which are secured to the upper surface of the blade. The rearward curvature of the brackets reduces the necessary forward projection of the hanger there-by minimizing the lever arm of the hanger and increasing itsability to withstand transverse forces. The brackets are se-cured to the hangers in a manner which allows the crane assem-bly to be easily removed from the blade after the blade is lowered to support the rake assembly on the ground. The side members are preferably integrally formed with the end teeth to maximize the strength of the frame. A rise extension may pro-ject upwardly from the upper edge of the rake assembly between the hangers to prevent objects from being thrown over the up-per edge of the blade.
7~5Z
BRIEF DESCRIPTION OF THE FIGURES OF THE DR~WINGS
_ _ . _ _ _ _ _ _ _ . _ _ _ _ _ , _ _ _ _ _ _ _ _ _ _ _ Fig. l is an isometric view of one embodiment of the bulldozer teeth assembly mounted on a bulldozer blade in an undeployed position.
Fig. 2 is an isometric view of the bulldozer teeth assembly of Fig. 1.
Fig. 3 is a cross-sectional view taken along the line 3-3 of Fig. 2.
Fig. 4 is a front elevational view of a portion of the bulldozer teeth assembly of Fig. 1 partially broken away.
Fig. 5 is a partial cross-sectional view illustrat-ing the manner in which the tubular support sleeve is pivot-ally secured to the transverse support shaft.
Fig. 6 is a cross-sectional view taken along the line 6-6 of Fig. 5.
Fig. 7 is an isometric view of another embodiment of the bulldozer teeth assembly mounted on a bulldozer blade.
Fig. 8 is an isometric view of the bulldozer teeth assembly of Fig. 7.
Fig. 9 is a side elevational view of the bulldozer teeth assembly of Fig. 8.
Fig. 10 is a cross-sectional view taken along the line 10-10 of Fig. 9, showing the manner in which the frame is adapted to wrap around the side of a bulldozer blade.
Fig. ll is a cross-sectional view taken along the line 11-ll of Fig. 9, showing the structure for mounting the teeth assembly on the bulldozer blade.
DETAILED DESCRIPTION OF THE PREFERRED EMBODI~ENTS
One embodiment of bulldozer teeth assembly, as illustrated in Figs. 1 and 2, is installed on a conventional bulldozer 10. The bulldozer 10 includes a vertically movable blade 12 or mold board having a curved front surface 14 and a 7~ 2 planar top edge 16. The b~lldozer teeth assembly includes a pair of frames 18, 20 each of which includes a plurality of rectangular braces 22 extending between tubular mounting s]eeves 24 an~ a rectangular bracing bar 26. Triangular gus-sets 28 (Fig. 2) are fastened between the braces 22 and bar 26 to further strengthen the rames 18, 20. The gussets 28 are angled rearwardly .o deflect dirt and debris. Similarly, triangular gussets 30 (Fig. 1) are fastened between the braces 22 and mounting sleeves 24.
Transverse movement of the frames 18, 20 is restric-ted by guides 31 projecting rearwardly from the bar 26 along the sides of the blade 14.
The braces 22 extend beyond the bar 26 to form teeth 32. As best illustrated in Figs. 3 and 4, the teeth 32 have a a rectangular cross-section and terminate in shanks 34 welded onto the teeth 32. Generally triangular gussets 40 are mount-ed on opposite sides of the teeth 32 between the teeth 32 and bar 26 to provide lateral strength to the teeth 32. A wear resistant tip 42 fits over the end of the shank 34 and is secured in place by a transverse pin 44. The bars 26 of the frames 18, 20 are connected to each other by a locking bolt 45 received by lugs 47 at the inner ends of the bars 26.
As illustrated in Figs. 1 and 2, pins 46 projecting from the ends of the support sleeves are received by hangers 48 which are welded along the upper edge 16 of the bulldozer blade 12. As best illustrated in Figs. 4, 5 and 6, the sup-port pins 46 are loosely received in their respective hangers 48 and are retained in place by retaining members 51 and locking pins 50. The hangers 48 are received by brackets 53 which are weïded to the blade 14. The hangers 48 are retained in position by bolts 55 extending through the hangers 48 and iS2 brackets 53~ The support pins 46 are inserted into the sleeves 24 with a circumferential groove 52 formed on the pin 46 aligned with a set screw 54 threaded into a bore in the sleeve 24. As illustrated in Fig. 5, the support structure at the other end of the frame 20 is identical to the support structure for the end of frame 18 illustrated in Fig. 4. The center support for the frames 18, 20 is substantially similar except that the shaft 46b project transversely from both sides of the hanger 48b and is not secured to the sleeves 24 by set screws. When the set screws 54 are torqued against the pins 46 in the grooves 52 the pins 46 are rigidly secured to the frames 18, 20 50 that they rotate within the hangers 48 and are retained in place by the retaining members 51 and pins 50 when the bulldozer teeth assembly is moved between deployed and undeployed positions as explained hereinafter.
The bulldozer blade teeth are illustrated in their undeployed position in Fig. 1. The frames 18, 20 are rotated in the hangers 48 to a substantially vertical position and are retained in place by hooks 52 having a hooked portion extend-ing around a brace 22 and a shank portion received by a sleeve54. To lock the bulldozer teeth in their upward, undeployed position the shank of the hook 52 is removed from the sleeve 54 and placed around the brace 22, and the shank of the hook 52 is then reinserted in the sleeve 54.
In its deployed position, the bulldozer teeth are allowed to rotate downwardly so that the frames 18, 20 contact the front surface 14 of the blade 12 near the lower edge of the blade 12. As the bulldozer 10 moves forward with the blade 12 lowered, the teeth 32 are highly effective in digging into a surface material. Since the forces on the teeth 32 are received from the front, the positions of the frames 18, 20 7SS~
remain fixed by the side guides 31 and the position of the b:Lade 12 so that the teeth 32 act as if they are rigidly sec-ured to the lower edge of the blade 12. However, when the bulldozer 10 moves rearwardly with the blade 12 in a lowered position, the forces are imparted to the teeth 32 from the rear causing the frames 18, 20 to swing forwardly and float with respect to the bulldozer blade 12 so that these rearward forces are incapable of fracturing the teeth 32 or shanks 34.
Dirt and debris may be cleaned from the teeth by moving the bulldozer rearwardly while raising and lowering the blade.
The alternative embodiment of the mounting system for pivotally securing a set of teeth to a bulldozer blade is illustrated in Figs. 7-11. As best illustrated Fig. 7 and 8, the assembly 70 includes a frame 72 having a plurality of teeth 74 projecting downwardly from its lower edge and braced with gussets 75. The frame 72 is formed by a pair of side members 76 projecting upwardly from where they are secured to a transverse member 78. The transverse member 78 may be rec-tangular in cross section as illustrated or it may be tubular, particularly for larger sizes of blades 14. Vertical braces 80 extend upwardly from the transverse members 78 to a tubular member 82. Gussets 84 further strengthen the attachment be-tween the vertical braces 80 and the transverse member 78.
The above described structure is, as described so far, substan-tially identical to the embodiment of Fig. 1.
The upper ends of the side members 76 terminate in respective brackets 90 formed by a pair of ears or bracket members 92 mounted on opposite sides of the side members 76.
As best illustrated in Figs. 8 and 9, the bracket members 92 project upwardly and rearwardly ~rom the side members 76. A
forwardly projecting hanger 94 is secured to the upper surface S~ii2 of the bulldoæer blade 1~ The hanger 94 is welded to a base plate 95 which is, in turn, welded to a wedge-shaped shim 97.
The angle of the shim 97 compensates for variations of the slant or angle at the top of various bulldozer blades 14. The shim 97 is preferably welded to the upper edge of the blade 14. As best illustrated in Fig. 11, the bracket members 92 and the hanger 94 positioned therebetween have formed therein alligned apertures 98 which loosely receive a pin 100 having a relatively wide head 102 and removable cotter pin 104 to pre-vent axial movement of the pin 100. The fairly loose contactof the pin 100 with the bracket member 92 and hanger 94 allow the brackets to freely pivot with respect to the hanger 94.
Forces are exerted on the hanger 94 from a variety of directions. The principle forces are forwardly and rear-wardly in direction. Since these forces act along the longi-tudinal axis of the hanger 94, the hanger 94 is able to with-stand these forces. However, the hanger 94 also receives transverse forces to a lesser degree which pose a more serious problem since the ability of the hanger 94 to withstand bend-ing responsive to transverse forces is markedly less than itsability to withstand forwardly and rearwardly directed forces.
The bending movement imparted to the hanger 94 is directly porportional to the distant which the hanger projects for-wardly from the blade 14. Consequently it is desirable to make the hanger as short as possible. Yet the hanger 94 must provide sufficient clearance between the side members 76 and the blade 14. In accordance with one aspect of the invention, the bracket members 92 project upwardly and rearwardly as ex-plained in reference to Fig. 9 to lessen the necessary pro-jection distance of the hanger 94. As a result, the hangersresistance to bending is markedly increased.
7~52 As with the embodiment of Fig. 1, rearwardly projec-ting side braces 110 extend along the sides of the blade 14 as illustrated in Fig. 10. These side braces 110 greatly in cr-ease the ability of frame 70 to withstand side loads.
Although the side members 76 may be formed separ-ately from the teeth 74 at the sides of the frames 72, the side members 76 and teeth 74 at the ends of the frames 72 are preferably integrally formed with each other so that the side members 76 and end teeth 74 forms are one structure. This construction maximizes the strength of the frame 72.
Returning, now, to Figs. 7, 8 and 9, a rigid rise extension 116 formed by a rectangular frame 118 covered by a rigid mesh 120 projects upwardly from the tubular member 82.
The transverse dimension of the rise 116 is less than the distance between the hangers 94 so that the rise 116 does not interfere with the mounting structure. The side edges 12~ of the rise 116 are beveled inwardly from the side of the blade 14 so that objects such as trees falling on the upper edge of the frame 118 near its sides are propelled from the rise 116.
The rise 116 prevents objects from being propelled over the upper edge of the blade 14 where they may injure the operator of the bulldozer 10.
BACKG~OUND OF THE INVENTION
Field of the Invention This invention relates to bulldozer blade attachments, and more particularly to a set of ripping or raking teeth which are pivotally secured to a bulldozer blade.
Description of the Prior Art Bulldozers having a planar, vertically movable blade secured to their forwared ends are commonly used in a variety of applications including ripping or raking in which a layer of rigid surfacing material i5 removed from an area, and grading in which the lower edge of the blade is scraped along a surface. During the ripping operatioin, ripping teeth have long been used to allow the blade to dig into the surfacing material. Although ripping teeth may be intergrally formed with the lower edge of the blade, in most instances the teeth are individually bolted on the lower edge of the blade to facilitate removal for the scraping operation and replacement of broken teeth. Although these teeth have gener-ally proven somewhat satisfactory for a ripping operation, they suffer from a number of serious shortcomings. The principal dis-advantage of bulldozer blades having conventional ripping teeth is the relatively large amount of time required to convert from a ripping or brush blade to a scraping blade. During a ripping operation after the surfacing material has been broken into pieces, the pieces must be removed from a surface and the surface leveled. With the ripping teeth in conventional use, the teeth must be first removed from the blade or else a sep-B
~ t7~arate bulldozer or dirt blade must be used for the grading operation.
Another problem associated with conventional ripping teeth is their inability to withstand rearward forces without fracturing. The ripping teeth generally project forwardly and downwardly from the lower edge of the bulldozer blade and are thus extremely sturdy in receiving forces from ln front of the blade since these forces act along the axis of the teeth. How-ever, forces imparted to the teeth from a rearward direction, such as when the bulldozer is moving in a reverse direction with the blade down, produce a force transverse to the longi-tudinal axis of the teeth which could easily fracture the teeth thereby necessitating time consuming and expensive re-placement. In summary, although conventional ripping teeth are generally satisfactory, they require an excessive period of time to convert from a ripping or brush blade blade to a scraping blade. Also, they are not sufficiently resistant to fracture by rearward forces.
Structures have been previously devised for pivot-ally securing a plurality of elongated members to a bulldozerblade. Examples of such devices are illustrated in U.S.
Patents No. 2,132,261; 2,262,415; 3,097,439; and 3,595,416.
However, these devices are not utilized to easily and quickly convert a conventional bulldozer blade to a ripping or brush blade. Also these devices are not both light in weight and sufficiently strong to withstand typically imposed loads.
Additionally, these prior art devices lack features which are essential for achieving various advantageous functions. For example, none of the prior art structures include means for positioning the elongated members so that they will not inter-fere with the use of the blade in a conventional manner.
Furthermore, some of these structures, such as that disclosed in U.S. Patent No. ~,262,415, employ mounting structures for the teeth which either interfere with use of the blade or are likely to be damaged when the teeth are removed from the blade.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a struc-ture for mounting a set of ripping teeth on a bulldozer blade which allows the blade to be easily and quickly converted be-tween a ripping blade and a scraping blade.
It is another object of the invention to provide a mounting structure which allows a set of ripping teeth to be added onto virtually any size and shape bulldozer blade.
It is still another object of the invention to pro-vide a mounting structure for a set of ripping teeth which does not interfere with the use of the blade and is not likely to be damaged when the teeth are removed from the blade.
It is a further object of the invention to provide a set of pivotally mounted ripping teeth which may be locked in-to an upwardly projecting position when the teeth are not to be used.
It is a still further object of the invention to provide a lightweight attachment to allow multi-purpose use of small and medium sized bulldozers which can thus be easily transported.
These and other objects of the invention are accomp-lished by a set of ripping teeth projecting from an integrally formed frame which is pivotally secured to the upper edge of the bulldozer blade along a transverse horizontal axis. In one embodiment, the frame is formed by two separatable sec-tions each of which terminates in a tubular mounting sleeve.Mounting pins project from the outer ends of the mounting 75~2 sleeves,. and a mounting shaft extends between the inner ends of the mGunting sleeves. The mounting pins and shaft are secured to hangers which are releasably supported by brackets mounted on the blade along the upper edge thereof. During the ripping operation the teeth project downwardly beyond the low-er edge of the blade so that the teeth dig into the under sur-face when the bulldozer moves forwardly. The frame is braced against transverse forces by guides projecting rearwardly from the sides of the frame along the sides of the blade. The teeth may be placed in an undeployed position by pivoting the frames upwardly where it is secured in place by a locking hook removably secured to the upper rear face of the blade and ex-tending around a frame member.
In a second embodiment, the frame includes a pair of side members having upper ends which terminate in respective brackets. The brackets curve rearwardly to receive respective forwardly projecting hangers which are secured to the upper surface of the blade. The rearward curvature of the brackets reduces the necessary forward projection of the hanger there-by minimizing the lever arm of the hanger and increasing itsability to withstand transverse forces. The brackets are se-cured to the hangers in a manner which allows the crane assem-bly to be easily removed from the blade after the blade is lowered to support the rake assembly on the ground. The side members are preferably integrally formed with the end teeth to maximize the strength of the frame. A rise extension may pro-ject upwardly from the upper edge of the rake assembly between the hangers to prevent objects from being thrown over the up-per edge of the blade.
7~5Z
BRIEF DESCRIPTION OF THE FIGURES OF THE DR~WINGS
_ _ . _ _ _ _ _ _ _ . _ _ _ _ _ , _ _ _ _ _ _ _ _ _ _ _ Fig. l is an isometric view of one embodiment of the bulldozer teeth assembly mounted on a bulldozer blade in an undeployed position.
Fig. 2 is an isometric view of the bulldozer teeth assembly of Fig. 1.
Fig. 3 is a cross-sectional view taken along the line 3-3 of Fig. 2.
Fig. 4 is a front elevational view of a portion of the bulldozer teeth assembly of Fig. 1 partially broken away.
Fig. 5 is a partial cross-sectional view illustrat-ing the manner in which the tubular support sleeve is pivot-ally secured to the transverse support shaft.
Fig. 6 is a cross-sectional view taken along the line 6-6 of Fig. 5.
Fig. 7 is an isometric view of another embodiment of the bulldozer teeth assembly mounted on a bulldozer blade.
Fig. 8 is an isometric view of the bulldozer teeth assembly of Fig. 7.
Fig. 9 is a side elevational view of the bulldozer teeth assembly of Fig. 8.
Fig. 10 is a cross-sectional view taken along the line 10-10 of Fig. 9, showing the manner in which the frame is adapted to wrap around the side of a bulldozer blade.
Fig. ll is a cross-sectional view taken along the line 11-ll of Fig. 9, showing the structure for mounting the teeth assembly on the bulldozer blade.
DETAILED DESCRIPTION OF THE PREFERRED EMBODI~ENTS
One embodiment of bulldozer teeth assembly, as illustrated in Figs. 1 and 2, is installed on a conventional bulldozer 10. The bulldozer 10 includes a vertically movable blade 12 or mold board having a curved front surface 14 and a 7~ 2 planar top edge 16. The b~lldozer teeth assembly includes a pair of frames 18, 20 each of which includes a plurality of rectangular braces 22 extending between tubular mounting s]eeves 24 an~ a rectangular bracing bar 26. Triangular gus-sets 28 (Fig. 2) are fastened between the braces 22 and bar 26 to further strengthen the rames 18, 20. The gussets 28 are angled rearwardly .o deflect dirt and debris. Similarly, triangular gussets 30 (Fig. 1) are fastened between the braces 22 and mounting sleeves 24.
Transverse movement of the frames 18, 20 is restric-ted by guides 31 projecting rearwardly from the bar 26 along the sides of the blade 14.
The braces 22 extend beyond the bar 26 to form teeth 32. As best illustrated in Figs. 3 and 4, the teeth 32 have a a rectangular cross-section and terminate in shanks 34 welded onto the teeth 32. Generally triangular gussets 40 are mount-ed on opposite sides of the teeth 32 between the teeth 32 and bar 26 to provide lateral strength to the teeth 32. A wear resistant tip 42 fits over the end of the shank 34 and is secured in place by a transverse pin 44. The bars 26 of the frames 18, 20 are connected to each other by a locking bolt 45 received by lugs 47 at the inner ends of the bars 26.
As illustrated in Figs. 1 and 2, pins 46 projecting from the ends of the support sleeves are received by hangers 48 which are welded along the upper edge 16 of the bulldozer blade 12. As best illustrated in Figs. 4, 5 and 6, the sup-port pins 46 are loosely received in their respective hangers 48 and are retained in place by retaining members 51 and locking pins 50. The hangers 48 are received by brackets 53 which are weïded to the blade 14. The hangers 48 are retained in position by bolts 55 extending through the hangers 48 and iS2 brackets 53~ The support pins 46 are inserted into the sleeves 24 with a circumferential groove 52 formed on the pin 46 aligned with a set screw 54 threaded into a bore in the sleeve 24. As illustrated in Fig. 5, the support structure at the other end of the frame 20 is identical to the support structure for the end of frame 18 illustrated in Fig. 4. The center support for the frames 18, 20 is substantially similar except that the shaft 46b project transversely from both sides of the hanger 48b and is not secured to the sleeves 24 by set screws. When the set screws 54 are torqued against the pins 46 in the grooves 52 the pins 46 are rigidly secured to the frames 18, 20 50 that they rotate within the hangers 48 and are retained in place by the retaining members 51 and pins 50 when the bulldozer teeth assembly is moved between deployed and undeployed positions as explained hereinafter.
The bulldozer blade teeth are illustrated in their undeployed position in Fig. 1. The frames 18, 20 are rotated in the hangers 48 to a substantially vertical position and are retained in place by hooks 52 having a hooked portion extend-ing around a brace 22 and a shank portion received by a sleeve54. To lock the bulldozer teeth in their upward, undeployed position the shank of the hook 52 is removed from the sleeve 54 and placed around the brace 22, and the shank of the hook 52 is then reinserted in the sleeve 54.
In its deployed position, the bulldozer teeth are allowed to rotate downwardly so that the frames 18, 20 contact the front surface 14 of the blade 12 near the lower edge of the blade 12. As the bulldozer 10 moves forward with the blade 12 lowered, the teeth 32 are highly effective in digging into a surface material. Since the forces on the teeth 32 are received from the front, the positions of the frames 18, 20 7SS~
remain fixed by the side guides 31 and the position of the b:Lade 12 so that the teeth 32 act as if they are rigidly sec-ured to the lower edge of the blade 12. However, when the bulldozer 10 moves rearwardly with the blade 12 in a lowered position, the forces are imparted to the teeth 32 from the rear causing the frames 18, 20 to swing forwardly and float with respect to the bulldozer blade 12 so that these rearward forces are incapable of fracturing the teeth 32 or shanks 34.
Dirt and debris may be cleaned from the teeth by moving the bulldozer rearwardly while raising and lowering the blade.
The alternative embodiment of the mounting system for pivotally securing a set of teeth to a bulldozer blade is illustrated in Figs. 7-11. As best illustrated Fig. 7 and 8, the assembly 70 includes a frame 72 having a plurality of teeth 74 projecting downwardly from its lower edge and braced with gussets 75. The frame 72 is formed by a pair of side members 76 projecting upwardly from where they are secured to a transverse member 78. The transverse member 78 may be rec-tangular in cross section as illustrated or it may be tubular, particularly for larger sizes of blades 14. Vertical braces 80 extend upwardly from the transverse members 78 to a tubular member 82. Gussets 84 further strengthen the attachment be-tween the vertical braces 80 and the transverse member 78.
The above described structure is, as described so far, substan-tially identical to the embodiment of Fig. 1.
The upper ends of the side members 76 terminate in respective brackets 90 formed by a pair of ears or bracket members 92 mounted on opposite sides of the side members 76.
As best illustrated in Figs. 8 and 9, the bracket members 92 project upwardly and rearwardly ~rom the side members 76. A
forwardly projecting hanger 94 is secured to the upper surface S~ii2 of the bulldoæer blade 1~ The hanger 94 is welded to a base plate 95 which is, in turn, welded to a wedge-shaped shim 97.
The angle of the shim 97 compensates for variations of the slant or angle at the top of various bulldozer blades 14. The shim 97 is preferably welded to the upper edge of the blade 14. As best illustrated in Fig. 11, the bracket members 92 and the hanger 94 positioned therebetween have formed therein alligned apertures 98 which loosely receive a pin 100 having a relatively wide head 102 and removable cotter pin 104 to pre-vent axial movement of the pin 100. The fairly loose contactof the pin 100 with the bracket member 92 and hanger 94 allow the brackets to freely pivot with respect to the hanger 94.
Forces are exerted on the hanger 94 from a variety of directions. The principle forces are forwardly and rear-wardly in direction. Since these forces act along the longi-tudinal axis of the hanger 94, the hanger 94 is able to with-stand these forces. However, the hanger 94 also receives transverse forces to a lesser degree which pose a more serious problem since the ability of the hanger 94 to withstand bend-ing responsive to transverse forces is markedly less than itsability to withstand forwardly and rearwardly directed forces.
The bending movement imparted to the hanger 94 is directly porportional to the distant which the hanger projects for-wardly from the blade 14. Consequently it is desirable to make the hanger as short as possible. Yet the hanger 94 must provide sufficient clearance between the side members 76 and the blade 14. In accordance with one aspect of the invention, the bracket members 92 project upwardly and rearwardly as ex-plained in reference to Fig. 9 to lessen the necessary pro-jection distance of the hanger 94. As a result, the hangersresistance to bending is markedly increased.
7~52 As with the embodiment of Fig. 1, rearwardly projec-ting side braces 110 extend along the sides of the blade 14 as illustrated in Fig. 10. These side braces 110 greatly in cr-ease the ability of frame 70 to withstand side loads.
Although the side members 76 may be formed separ-ately from the teeth 74 at the sides of the frames 72, the side members 76 and teeth 74 at the ends of the frames 72 are preferably integrally formed with each other so that the side members 76 and end teeth 74 forms are one structure. This construction maximizes the strength of the frame 72.
Returning, now, to Figs. 7, 8 and 9, a rigid rise extension 116 formed by a rectangular frame 118 covered by a rigid mesh 120 projects upwardly from the tubular member 82.
The transverse dimension of the rise 116 is less than the distance between the hangers 94 so that the rise 116 does not interfere with the mounting structure. The side edges 12~ of the rise 116 are beveled inwardly from the side of the blade 14 so that objects such as trees falling on the upper edge of the frame 118 near its sides are propelled from the rise 116.
The rise 116 prevents objects from being propelled over the upper edge of the blade 14 where they may injure the operator of the bulldozer 10.
Claims (5)
1. In a bulldozer teeth assembly adapted to be pivot-ally secured to a bulldozer blade, said assembly including a rigid rectangular frame having a pair of rigid, elongated side members and a plurality of teeth projecting downwardly from a lower edge of said frame, mounting means for pivotally secured said frame to said blade, comprising:
an ear secured to the upper end of each side member, said ears curving upwardly and rearwardly toward said blade; and a pair of spaced part hangers mounted on the upper edge of said blade, said hangers being received by and pivotally se-cured to said ears whereby the rearward curvature of such ears minimizes the necessary projection distance of said hanger to minimize the moment arm of said hangers responsive to transverse loads.
an ear secured to the upper end of each side member, said ears curving upwardly and rearwardly toward said blade; and a pair of spaced part hangers mounted on the upper edge of said blade, said hangers being received by and pivotally se-cured to said ears whereby the rearward curvature of such ears minimizes the necessary projection distance of said hanger to minimize the moment arm of said hangers responsive to transverse loads.
2. The mounting means of claim 1, wherein each of said ears includes a pair of spaced part, upwardly and rearwardly pro-jecting bracket members having axially alligned apertures, and where each of said hangers projects between said bracket members and having an aperture positioned in axial allignment with the apertures of said bracket members, said mounting means further including cylindrical pin releasably inserted through the aper-tures formed in said bracket members and said hangers to releas-ably and pivotally secure said frame to said blade.
3. The mounting means of claim 1, further including a rigid rise extension projecting upwardly from the upper edge of said blade between said hangers to prevent objects from being propelled over the upper edge of said blade.
4. The mounting means of claim 3, wherein the side edges of said rise extension panel are beveled inwardly toward the upper edge thereof to deflect objects falling on said rise extension panel adjacent the edges thereof transversely away from said rise extension panel.
5. The mounting means of claim 1, wherein said side members project downwardly to form end teeth at the lower edge of said frame such that said end teeth and end members form a unitary structure to maximize the strength of said frame and teeth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16398180A | 1980-06-30 | 1980-06-30 | |
| US163,981 | 1980-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1147552A true CA1147552A (en) | 1983-06-07 |
Family
ID=22592469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000363880A Expired CA1147552A (en) | 1980-06-30 | 1980-11-03 | Pivotally mounted bulldozer teeth assembly |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5744032A (en) |
| CA (1) | CA1147552A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438871A (en) * | 2019-07-23 | 2019-11-12 | 郑丹丹 | A kind of highway construction is rolling bulldozed equipment with road surface |
-
1980
- 1980-11-03 CA CA000363880A patent/CA1147552A/en not_active Expired
-
1981
- 1981-06-30 JP JP10311381A patent/JPS5744032A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5744032A (en) | 1982-03-12 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |