CA2455314A1 - Retaining pin assembly - Google Patents
Retaining pin assembly Download PDFInfo
- Publication number
- CA2455314A1 CA2455314A1 CA 2455314 CA2455314A CA2455314A1 CA 2455314 A1 CA2455314 A1 CA 2455314A1 CA 2455314 CA2455314 CA 2455314 CA 2455314 A CA2455314 A CA 2455314A CA 2455314 A1 CA2455314 A1 CA 2455314A1
- Authority
- CA
- Canada
- Prior art keywords
- retaining pin
- retaining
- comprised
- fastener
- washer
- 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.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
- E02F9/2816—Mountings therefor
- E02F9/2833—Retaining means, e.g. pins
Abstract
A retaining pin assembly for detachably connecting a first member and a second member, including a retaining pin for insertion in a transverse bore in the first member, a retaining washer for positioning in a recess formed in either the first member or the second member, and a fastener for fastening the retaining washer to the retaining pin.
Description
RETAINING PIN ASSEMBLY
TECHNICAL FIELD
S A retaining pin assembly for detachably connecting a first member and a second member such as an adapter and a disposable wear part on a piece of earthworking equipment.
BACKGROUND OF THE INVENTION
Earthworking equipment often utilizes disposable wear parts which are connected to the earthworking equipment by way of an adapter and a retaining mechanism.
Examples of such disposable wear parts include ripper shank (adapter) protectors (including ripper tips and shank shims), teeth and/or tips for bucket shovels, teeth and/or tips for excavation buckets, and any other disposable wear part which is attached to the earthworking equipment by means of a retaining mechanism.
Often the retaining mechanism is comprised of a retaining pin assembly such as that described in U.S. Patent No. 4,823,486 (Diekevers et al) and U.S. Patent No. 5,009,017 (Diekevers et al).
The retaining pin assembly described in Diekevers et al is comprised of a grooved retaining pin and a keeper means. The keeper means is comprised of a grooved metallic washer and a resilient retaining ring. The keeper means is designed to be placed within a recess in the adapter and then detachably fixed to the retaining pin to restrain axial movement of the retaining pin relative to the metallic washer.
The retaining pin assembly in Diekevers et al must be assembled and disassembled using tools including sledgehammers and punches which provide a driving force.
During assembly, sufficient driving force must be provided to expand the resilient retaining ring within the groove in the metallic washer and to advance the retaining pin until the resilient retaining ring "springs inward" into place in the groove in the retaining pin.
During disassembly, sufficient driving force must theoretically be provided to shear the resilient retaining ring so that the retaining pin can be moved axially relative to the metallic washer. In practice, the forces required to cause pure shearing of the retaining ring are extreme, and typically the retaining ring is destroyed and/or the metallic washer is fractured during disassembly of the retaining pin assembly.
The disassembly of the retaining pin assembly in Diekevers et al is relatively time consuming, labour intensive and dangerous. Two persons are typically required, with one person holding a punch so that it is aligned with the axis of the retaining pin and the second person striking the punch with a sledgehammer. There is a risk of injury to the persons involved due to being struck either by the sledgehammer or by debris which is scattered during the disassembly process.
In addition, the striking of the retaining pin, particularly during disassembly of the retaining pin mechanism, often damages the retaining pin so that it cannot be reused.
Furthermore, all or a portion of the retaining ring may remain in the groove on the retaining pin after the retaining pin assembly is disassembled and may be difficult to remove from the groove, thus effectively rendering the retaining pin unusable. Even if the retaining pin is not damaged or rendered unusable, the resilient retaining ring must be replaced after each use and often the metallic washer must also be replaced.
There therefore remains a need for a retaining mechanism which can be disassembled easily and safely and typically without the need for significant driving forces and for a retaining mechanism which includes components which can often be reused.
SUMMARY OF THE INVENTION
The present invention is a retaining mechanism for detachably connecting a first member and a second member. More particularly, the retaining mechanism is comprised of a retaining pin assembly.
TECHNICAL FIELD
S A retaining pin assembly for detachably connecting a first member and a second member such as an adapter and a disposable wear part on a piece of earthworking equipment.
BACKGROUND OF THE INVENTION
Earthworking equipment often utilizes disposable wear parts which are connected to the earthworking equipment by way of an adapter and a retaining mechanism.
Examples of such disposable wear parts include ripper shank (adapter) protectors (including ripper tips and shank shims), teeth and/or tips for bucket shovels, teeth and/or tips for excavation buckets, and any other disposable wear part which is attached to the earthworking equipment by means of a retaining mechanism.
Often the retaining mechanism is comprised of a retaining pin assembly such as that described in U.S. Patent No. 4,823,486 (Diekevers et al) and U.S. Patent No. 5,009,017 (Diekevers et al).
The retaining pin assembly described in Diekevers et al is comprised of a grooved retaining pin and a keeper means. The keeper means is comprised of a grooved metallic washer and a resilient retaining ring. The keeper means is designed to be placed within a recess in the adapter and then detachably fixed to the retaining pin to restrain axial movement of the retaining pin relative to the metallic washer.
The retaining pin assembly in Diekevers et al must be assembled and disassembled using tools including sledgehammers and punches which provide a driving force.
During assembly, sufficient driving force must be provided to expand the resilient retaining ring within the groove in the metallic washer and to advance the retaining pin until the resilient retaining ring "springs inward" into place in the groove in the retaining pin.
During disassembly, sufficient driving force must theoretically be provided to shear the resilient retaining ring so that the retaining pin can be moved axially relative to the metallic washer. In practice, the forces required to cause pure shearing of the retaining ring are extreme, and typically the retaining ring is destroyed and/or the metallic washer is fractured during disassembly of the retaining pin assembly.
The disassembly of the retaining pin assembly in Diekevers et al is relatively time consuming, labour intensive and dangerous. Two persons are typically required, with one person holding a punch so that it is aligned with the axis of the retaining pin and the second person striking the punch with a sledgehammer. There is a risk of injury to the persons involved due to being struck either by the sledgehammer or by debris which is scattered during the disassembly process.
In addition, the striking of the retaining pin, particularly during disassembly of the retaining pin mechanism, often damages the retaining pin so that it cannot be reused.
Furthermore, all or a portion of the retaining ring may remain in the groove on the retaining pin after the retaining pin assembly is disassembled and may be difficult to remove from the groove, thus effectively rendering the retaining pin unusable. Even if the retaining pin is not damaged or rendered unusable, the resilient retaining ring must be replaced after each use and often the metallic washer must also be replaced.
There therefore remains a need for a retaining mechanism which can be disassembled easily and safely and typically without the need for significant driving forces and for a retaining mechanism which includes components which can often be reused.
SUMMARY OF THE INVENTION
The present invention is a retaining mechanism for detachably connecting a first member and a second member. More particularly, the retaining mechanism is comprised of a retaining pin assembly.
The retaining pin assembly is relatively easy to assemble and disassemble and includes parts which may typically be reused. In normal use, the disassembly of the retaining pin assembly does not require shearing or other destruction of any of its components. In a preferred embodiment, the retaining pin assembly does, however, provide for a backup mechanism for disassembly of the retaining pin assembly, which backup mechanism includes a shear plane for shearing of one of the parts of the retaining pin assembly.
The first member and the second member may be comprised of any parts, members or elements which must be detachably connected with each other. In preferred embodiments of the invention, the first and second members are comprised of components of earthworking equipment. More specifically, in preferred embodiments the first member is comprised of an adapter and the second member is comprised of a wear part such as a tooth or a tip for a piece of earthworking equipment.
As used herein, the word "diameter" is intended to refer to a transverse dimension regardless of whether the dimension is circular or some other shape.
As a result, the word "diameter" as used herein is intended to convey an indication of relative size without regard to the shape of the dimension in question.
In a first aspect, the invention is a retaining pin assembly for detachably connecting a first member and a second member, the first member defining a transverse bore extending therethrough, the second member comprising a pair of sidewalls for straddling the first member to provide a member interface between the first member and each of the sidewalls, each of the sidewalls defining an aperture, wherein the apertures are substantially axially aligned with the transverse bore when the first member and the second member are in a connecting configuration, wherein one of the first member and the second member defines a recess, wherein the recess is adjacent to one of the member interfaces and is in substantial axial alignment with the transverse bore and the apertures when the first member and the second member are in the connecting configuration, the retaining pin assembly comprising:
The first member and the second member may be comprised of any parts, members or elements which must be detachably connected with each other. In preferred embodiments of the invention, the first and second members are comprised of components of earthworking equipment. More specifically, in preferred embodiments the first member is comprised of an adapter and the second member is comprised of a wear part such as a tooth or a tip for a piece of earthworking equipment.
As used herein, the word "diameter" is intended to refer to a transverse dimension regardless of whether the dimension is circular or some other shape.
As a result, the word "diameter" as used herein is intended to convey an indication of relative size without regard to the shape of the dimension in question.
In a first aspect, the invention is a retaining pin assembly for detachably connecting a first member and a second member, the first member defining a transverse bore extending therethrough, the second member comprising a pair of sidewalls for straddling the first member to provide a member interface between the first member and each of the sidewalls, each of the sidewalls defining an aperture, wherein the apertures are substantially axially aligned with the transverse bore when the first member and the second member are in a connecting configuration, wherein one of the first member and the second member defines a recess, wherein the recess is adjacent to one of the member interfaces and is in substantial axial alignment with the transverse bore and the apertures when the first member and the second member are in the connecting configuration, the retaining pin assembly comprising:
(a) a retaining pin for insertion in the transverse bore such that a bore interface is provided between the retaining pin and the transverse bore;
(b) a retaining washer for positioning in the recess; and (c) a fastener for fastening the retaining washer to the retaining pin.
The fastener may be comprised of any device, structure or mechanism which can fasten the retaining washer to the retaining pin either removably or permanently. For example, the fastener may be comprised of one or more bolts, nuts, studs, rivets, screws, welds or adhesives. Preferably the fastener is comprised of a removable fastening mechanism such as a bolt, nut or screw.
Preferably the retaining pin is comprised of pin threads and the fastener is comprised of complementary fastener threads so that the retaining washer is fastened to the retaining pin with a threaded connection. Alternatively, instead of a threaded connection the retaining pin and the fastener may be connected together by friction or by a suitable latch mechanism.
In one embodiment, the retaining pin defines a socket section with internal threads and the fastener is comprised of a bolt with external threads. In a second embodiment, the retaining pin is comprised of a plug section with external threads and the fastener is comprised of a socket section with internal threads, in which case the fastener is comprised of a nut or other suitable device, structure or mechanism.
The retaining pin may be solid or hollow. Where the retaining pin defines the socket section the retaining pin is preferably hollow, defining a longitudinal bore extending from a first end of the retaining pin to a second end of the retaining pin so that debris in the socket section of the retaining pin can be passed through the longitudinal bore without accumulating in the socket section. The longitudinal bore may be comprised of the socket section.
(b) a retaining washer for positioning in the recess; and (c) a fastener for fastening the retaining washer to the retaining pin.
The fastener may be comprised of any device, structure or mechanism which can fasten the retaining washer to the retaining pin either removably or permanently. For example, the fastener may be comprised of one or more bolts, nuts, studs, rivets, screws, welds or adhesives. Preferably the fastener is comprised of a removable fastening mechanism such as a bolt, nut or screw.
Preferably the retaining pin is comprised of pin threads and the fastener is comprised of complementary fastener threads so that the retaining washer is fastened to the retaining pin with a threaded connection. Alternatively, instead of a threaded connection the retaining pin and the fastener may be connected together by friction or by a suitable latch mechanism.
In one embodiment, the retaining pin defines a socket section with internal threads and the fastener is comprised of a bolt with external threads. In a second embodiment, the retaining pin is comprised of a plug section with external threads and the fastener is comprised of a socket section with internal threads, in which case the fastener is comprised of a nut or other suitable device, structure or mechanism.
The retaining pin may be solid or hollow. Where the retaining pin defines the socket section the retaining pin is preferably hollow, defining a longitudinal bore extending from a first end of the retaining pin to a second end of the retaining pin so that debris in the socket section of the retaining pin can be passed through the longitudinal bore without accumulating in the socket section. The longitudinal bore may be comprised of the socket section.
The retaining pin assembly may be configured to be assembled into an assembled configuration in which the retaining washer is fastened between the retaining pin and the fastener. In the assembled configuration, the retaining pin assembly has an assembled length. The assembled length is selected to be greater than a distance between the member interfaces when the first member and the second member are in the connecting configuration.
The recess may be defined by either the first member or the second member.
The recess may also be defined partially by the first member and partially by the second member. In a preferred embodiment the recess is defined by the first member.
The retaining washer is designed to be placed in the recess to restrict the axial movement of the retaining pin when the retaining pin assembly is in the assembled configuration. As a result, the retaining washer is designed to have a diameter which is greater than the diameter of both the transverse bore and the aperture which is adjacent to the recess when the first member and the second member are in the connecting configuration. The retaining washer may be constructed of steel or of any other suitable material.
The retaining pin assembly may be comprised of an integrated retainer component which comprises the retaining washer and the fastener. The integrated retainer component may be comprised of a plurality of parts or components which are fastened together either temporarily or permanently. Preferably, however, the integrated retainer component is either comprised of a plurality of parts or components which are permanently fastened together by welding or other suitable means, or is constructed of a single piece of a suitable material.
Where constructed of a single piece of material, the integrated retainer component may be fabricated in any suitable manner, such as by machining from a billet of material, casting or forging. In some preferred embodiments, the integrated retainer component is forged.
The recess may be defined by either the first member or the second member.
The recess may also be defined partially by the first member and partially by the second member. In a preferred embodiment the recess is defined by the first member.
The retaining washer is designed to be placed in the recess to restrict the axial movement of the retaining pin when the retaining pin assembly is in the assembled configuration. As a result, the retaining washer is designed to have a diameter which is greater than the diameter of both the transverse bore and the aperture which is adjacent to the recess when the first member and the second member are in the connecting configuration. The retaining washer may be constructed of steel or of any other suitable material.
The retaining pin assembly may be comprised of an integrated retainer component which comprises the retaining washer and the fastener. The integrated retainer component may be comprised of a plurality of parts or components which are fastened together either temporarily or permanently. Preferably, however, the integrated retainer component is either comprised of a plurality of parts or components which are permanently fastened together by welding or other suitable means, or is constructed of a single piece of a suitable material.
Where constructed of a single piece of material, the integrated retainer component may be fabricated in any suitable manner, such as by machining from a billet of material, casting or forging. In some preferred embodiments, the integrated retainer component is forged.
The use of the integrated retainer component may assist in simplifying the manufacture and use of the retaining pin assembly by reducing the number of parts which are included in the retaining pin assembly. In addition, the use of the integrated retainer component may provide greater flexibility in configuring the retaining pin assembly.
However, the use of the integrated retainer component will for some applications of the invention require modification of the first member and/or the second member to facilitate assembly of the retaining pin assembly, since the fastener will typically be designed to extend across the member interface when the retaining washer is positioned in the recess, thus effectively preventing the retaining washer from being positioned in the recess before the first member and the second member are placed in the connecting configuration.
In one embodiment, the modification involves providing the second member with a slot or a groove to accommodate the fastener and a groove to accommodate the retaining washer so that the retaining washer can be positioned in the recess after the first member and the second member are placed in the connecting configuration. In other embodiments, the modification may involve providing the second member with a slot or a groove to accommodate the fastener and providing the first member with a groove to accommodate the retaining washer. In yet other embodiments, the modification may involve providing the second member with a slot or groove to accommodate the fastener and providing both the second member and the first member with a groove to accommodate the retaining washer.
The retaining washer may define a shear plane for shearing of the retaining washer. The shear plane may be comprised of a portion of the retaining washer which is relatively more susceptible to shear failure than the remainder of the retaining washer. This susceptibility may be provided by constructing all or a portion of the retaining washer of a material having a relatively low shear strength, or may be provided by constructing all or a portion of the retaining washer so that it has a "shearable thickness" having regard to the forces which will be applied to the retaining washer.
However, the use of the integrated retainer component will for some applications of the invention require modification of the first member and/or the second member to facilitate assembly of the retaining pin assembly, since the fastener will typically be designed to extend across the member interface when the retaining washer is positioned in the recess, thus effectively preventing the retaining washer from being positioned in the recess before the first member and the second member are placed in the connecting configuration.
In one embodiment, the modification involves providing the second member with a slot or a groove to accommodate the fastener and a groove to accommodate the retaining washer so that the retaining washer can be positioned in the recess after the first member and the second member are placed in the connecting configuration. In other embodiments, the modification may involve providing the second member with a slot or a groove to accommodate the fastener and providing the first member with a groove to accommodate the retaining washer. In yet other embodiments, the modification may involve providing the second member with a slot or groove to accommodate the fastener and providing both the second member and the first member with a groove to accommodate the retaining washer.
The retaining washer may define a shear plane for shearing of the retaining washer. The shear plane may be comprised of a portion of the retaining washer which is relatively more susceptible to shear failure than the remainder of the retaining washer. This susceptibility may be provided by constructing all or a portion of the retaining washer of a material having a relatively low shear strength, or may be provided by constructing all or a portion of the retaining washer so that it has a "shearable thickness" having regard to the forces which will be applied to the retaining washer.
The purpose of the shear plane is to provide a mechanism for disassembly of the retaining pin assembly if either the fastener is designed to permanently fasten the retaining washer to the retaining pin or if for some reason the fastener cannot be removed from the retaining pin assembly during disassembly of the retaining pin assembly.
The shear plane is designed to be generally coincident with a plane which will facilitate removal of the retaining pin from the transverse bore. For example, the shear plane may be generally coincident with either the diameter of the aperture which is positioned adjacent to the recess or with the diameter of the transverse bore. Preferably the shear plane is generally coincident with the smaller of these two diameters so that the retaining pin can be removed from the transverse bore from either side of the first member. If the shear plane is generally coincident with the diameter of the transverse bore, it is more particularly preferably generally coincident with the bore interface in order to provide for a clear line of shear between an axial driving force acting on either the retaining pin or the fastener and a reaction force 1 S acting on the retaining washer.
Preferably the shear plane is provided by a region of shearable thickness or an overall shearable thickness of the retaining washer. In some embodiments the shearable thickness is provided as a groove in the retaining washer. Alternatively the shearable thickness may be provided as a region of shearable thickness in the retaining washer or an overall shearable thickness of the retaining washer.
Where the shearable thickness is provided by a groove, the groove preferably generally coincides with the bore interface and the transverse bore.
Alternatively, the groove could generally coincide with the diameter of the aperture which is positioned adjacent to the recess. Preferably the groove is an annular groove. The groove provides a region of reduced thickness in the retaining washer which is relatively more easy to shear than the remainder of the retaining washer.
The groove may be comprised of a profile which is either symmetrical or asymmetrical. The profile may be comprised of any shape and depth. Exemplary shapes include a cone, a parabola, a circle, a rectangle, a triangle and an ellipse, which shapes may be complete or truncated. In some preferred embodiments the shape of the profile is comprised of a truncated cone.
The retaining pin assembly is preferably designed so that the assembled configuration and the assembled length of the retaining pin assembly are defined during the assembly of the retaining pin assembly. Any device, structure or mechanism which is effective to accomplish this objective may be utilized.
For example, the retaining pin may be comprised of a pin shoulder and the fastener may be comprised of a complementary fastener shoulder, which shoulders are configured to engage each other to define the assembled configuration of the retaining pin assembly. In other words, the shoulders engage each other to limit the movement of the fastener relative to the retaining pin.
In one preferred embodiment, the bolt is comprised of a plug section, a head section and a washer mounting section located between the plug section and the head section.
In this preferred embodiment the fastener threads are located on the plug section.
In this preferred embodiment, the retaining washer defines a washer bore and the retaining pin has an outer diameter. Preferably the diameter of the washer bore is less than the outer diameter of the retaining pin. Furthermore, in this preferred embodiment the head section of the bolt and the washer mounting section of the bolt each have a diameter.
Preferably the diameter of the washer mounting section is less than the diameter of the washer bore and preferably the diameter of the washer bore is less than the diameter of the head section. In this preferred embodiment, the retaining pin and the bolt may be comprised of complementary shoulders such as a pin shoulder and a bolt shoulder which are configured to engage each other to define the assembled configuration of the retaining pin assembly.
Preferably the retaining pin is further comprised of a tool engagement surface for facilitating assembly and/or disassembly of the retaining pin assembly. In some embodiments _g_ each of the retaining pin and the fastener are preferably comprised of a tool engagement surface for facilitating assembly and/or disassembly of the retaining pin assembly.
The tool engagement surfaces may be comprised of any suitable surface or surfaces and may be comprised of external surfaces, internal surfaces or combinations thereof.
Where the fastener and the retaining pin are connected with a threaded connection, the tool engagement surfaces may be comprised of suitable engagement surfaces for engaging a tool which is compatible with a threaded connection, such as a wrench or a screwdriver. For example, the tool engagement surfaces may be comprised of external surfaces such as hexagonal surfaces or square surfaces for engaging a tool such as a socket, wrench or pliers, or the tool engagement surfaces may be comprised of internal surfaces for engaging a tool such as an Allen wrench or a screwdriver.
Where the fastener and the retaining pin are connected with a threaded connection and where the retaining pin assembly is comprised of the integrated retainer component, the tool engagement surface on the fastener may be substituted by providing the retaining washer with a recess engaging surface which is adapted to engage the recess in order to inhibit rotation of the integrated retainer component relative to the recess. The recess engaging surface may be comprised of any suitable surface, including a hexagonal surface, a square surface or some other "non-circular" shape which defines the periphery of the retaining washer.
Where the fastener and the retaining pin are connected with a different type of connection, the tool engagement surfaces may be comprised of any suitable surface such as necks or hooks for applying an appropriate force to the fastener and the retaining pin.
Where tool engagement surfaces are provided on each of the retaining pin and the fastener, the tool engagement surfaces are preferably located adjacent to opposite ends of the retaining pin assembly when it is in the assembled configuration, so that one of the tool engagement surfaces can be accessed from each end of the retaining pin assembly.
For example, where the retaining pin defines a socket section, the socket section of the retaining pin may be located adjacent to the first end of the retaining pin, the tool engagement surface on the retaining pin may be located adjacent to the second end of the retaining pin, and the tool engagement surface on the fastener may be located on the head section of the bolt.
Where a tool engagement surface is provided only on the retaining pin, the tool engagement surface is preferably located adjacent to one end of the retaining pin assembly when it is in the assembled configuration so that it can be accessed from an end of the retaining pin assembly.
BRIEF DESCRIPTION OF DRAWINGS
Embodiments of the invention will now be described with reference to the accompanying drawings, in which:
Figure 1 is a side view of a replaceable tooth connected with an adapter on a piece of earthworking equipment using a retaining pin assembly according to a preferred embodiment of the invention.
Figure 2 is a transverse partial section view of the retaining pin assembly of Figure 1 taken along Section A - A from Figure 1.
Figure 3 is a partial section view and an end view of a retaining pin according to a preferred embodiment of the invention, including a longitudinal bore and a square external tool engagement surface.
Figure 4 is a partial section view and an end view of a retaining pin according to a preferred embodiment of the invention, including a longitudinal bore and a hexagonal external tool engagement surface.
Figure 5 is a side view of a fastener according to a preferred embodiment of the invention, including a hexagonal external tool engagement surface.
Figure 6 is a side view of a fastener according to a preferred embodiment of the invention, including a square external tool engagement surface.
Figure 7 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of a symmetrical truncated cone.
Figure 8 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of an asymmetrical truncated cone.
Figure 9 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of a symmetrical truncated parabola.
Figure 10 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of an asymmetrical truncated parabola.
Figure 11 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of a rectangle.
Figure 12 is a schematic representation of shear forces experienced by a retaining washer according to a preferred embodiment of the invention as a result of an axial driving force being applied to either the retaining pin or to the fastener.
Figure 13 is a side view and an end view of a solid retaining pin according to a preferred embodiment of the invention, including both a hexagonal external tool engagement surface and a hexagonal internal tool engagement surface.
S Figure 14 is a side view and an end view of a solid retaining pin according to a preferred embodiment of the invention, including both a square external tool engagement surface and a square internal tool engagement surface.
Figure 15 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal external tool engagement surface, a circular retaining washer and a shear plane comprising a groove with a profile in the shape of an asymmetrical truncated cone.
Figure 16 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal external tool engagement surface, a circular retaining washer and a shear plane comprising a region of shearable thickness in the retaining washer.
Figure 17 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal retaining washer and a shear plane comprising a region of shearable thickness in the retaining washer.
Figure 18 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a square retaining washer and a shear plane comprising a region of shearable thickness in the retaining washer.
Figure 19 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal external tool engagement surface, a circular retaining washer and a shear plane comprising an overall shearable thickness of the retaining washer.
Figure 20 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal retaining washer and a shear plane comprising an overall shearable thickness of the retaining washer.
Figure 21 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a square retaining washer and a shear plane comprising an overall shearable thickness of the retaining washer.
Figure 22 is a side view of a first member and a second member which have been modified to facilitate use of an integrated retainer component according to a preferred embodiment of the invention.
Figure 23 is a transverse partial section view of the first member and the second member of Figure 22 taken along Section C - C from Figure 22.
DETAILED DESCRIPTION
Preferred embodiments of the invention are depicted in Figure 1 to Figure 21.
Figure 1 to Figure 12 depict a first set of embodiments. Figure 13 to Figure 21 depict components of a second set of embodiments. Figure 22 and Figure 23 depict modifications to a first member and a second member which have been made to accommodate the embodiments of the invention depicted in Figure 13 to Figure 21.
The embodiments depicted in Figure 1 to Figure 21 are intended only to provide illustration of specific preferred applications of various features of the invention. Many of the features of the invention are applicable through a wide range of embodiments, all within the scope of the invention. In the Figures and in the description that follows, common reference numbers are used to describe elements which are common to the various embodiments.
Referring to Figure 1, a retaining pin assembly (20) is shown in an assembled configuration in which a first member consisting of an adapter (22) is in a connecting configuration with a second member consisting of a tooth (24) for a piece of earthworking equipment (not shown).
Referring to Figure 2, the retaining pin assembly (20) is depicted in the assembled configuration. The retaining pin assembly (20) includes a retaining pin (26), a retaining washer (28) and a fastener (30) for fastening the retaining washer (28) to the retaining pin (26).
Referring to Figure 2, the tooth (24) includes a pair of sidewalls (32) which straddle the adapter (22) and provide a member interface (34) between the adapter (22) and each of the sidewalk (32). The adapter (22) includes a transverse bore (36) and each of the sidewalk (32) includes an aperture (38). A recess (40) is defined by the adapter (22) adjacent to one of the member interfaces (34). The transverse bore (36), the apertures (38) and the recess (40) are all substantially in axial alignment.
The retaining pin (26) is positioned in the transverse bore (36) such that a bore interface (42) is provided between the retaining pin (26) and the transverse bore (36). The retaining pin assembly (20) in the assembled configuration has an assembled length (44). The assembled length (44) is greater than the distance between the member interfaces (34) so that the retaining pin assembly (20) protrudes into each of the apertures (38), thus preventing the tooth (24) from separating from the adapter (22).
The retaining pin (26) has a first end (46) and a second end (48). Referring to Figure 3 and Figure 4, a socket section (50) of the retaining pin (22) is provided adjacent to the first end (46) of the retaining pin (26). The socket section (50) includes pin threads (52) and a pin shoulder (54). The socket section (50), including the pin threads (52) and the pin shoulder (54), are designed to be complementary with corresponding structures on the fastener (30).
The retaining pin (26) preferably defines a longitudinal bore (56) and is therefore preferably hollow along its length in order to prevent the accumulation of debris in the socket section (50), which debris could interfere with the assembly and disassembly of the retaining pin assembly (20). The longitudinal bore (56) includes the socket section (50).
A tool engagement surface (58) is provided adjacent to the second end (48) of the retaining pin (26). The tool engagement surface (58) facilitates gripping of the retaining pin (26) by a tool (not shown) during assembly and disassembly of the retaining pin assembly (20).
Preferably the tool engagement surface (58) is designed to accommodate a socket or a wrench and is preferably comprised of either a square surface as in Figure 3 or a hexagonal surface as in Figure 4.
The purpose of the fastener (30) is to fasten the retaining washer (28) to the retaining pin (26). The fastener (30) is preferably a removable fastener, but the fastener (30) could also permanently fasten the retaining washer (28) to the retaining pin (26). If the fastener (30) is a removable fastener, then a shearing mechanism such as described below is optional. If the fastener (30) is non-removable, then a shearing mechanism as described below or some other disassembly mechanism will be required.
In the embodiments of Figure 1 to Figure 21, the fastener (30) and the retaining pin (26) together provide a threaded connection so that the retaining pin (26) is comprised of the pin threads (52) and the fastener (30) is comprised of a bolt (60) having complementary fastener threads (62). The retaining pin assembly (20) may be designed so that the pin threads (52) are either external threads or internal threads.
In the embodiment of Figure 1 to Figure 12 where the retaining pin (26) is comprised of the socket section (50), the pin threads (52) are internal threads which line the socket section (SO) and the fastener threads (62) are external threads.
Refernng to Figure 5 and Figure 6, the bolt (60) is comprised of a plug section (64), a head section (66) and a washer mounting section (68) which is between the plug section (64) and the head section (66). In addition, the fastener threads (62) are comprised of external threads on the plug section (64) of the bolt (60) and the bolt (60) is further comprised of a fastener shoulder (70).
The pin threads (52) and the fastener threads (62) engage each other to provide the threaded connection between the bolt (60) and the retaining pin and the pin shoulder (54) and the fastener shoulder (70) engage each other to limit the travel of the bolt (60) within the retaining pin (26) and thus define the assembled configuration of the retaining pin assembly (20).
The head section (66) of the bolt (60) is provided with a tool engagement surface (72) so that the fastener (30) may be engaged by a tool (not shown).
Preferably the tool engagement surface (58) on the retaining pin (26) is similar or identical to the tool engagement surface (72) on the fastener (30). For example, the tool engagement surface (72) on the bolt (60) may be comprised of a hexagonal surface as in Figure S or a square surface as in Figure 6.
The retaining washer (28) is designed to be fastened to the retaining pin (26) with the fastener (30). Referring to Figure 2, in the assembled configuration of the embodiment of Figure 1 to Figure 12 the retaining washer (28) is positioned on the washer mounting section (68) of the bolt (60) and is also positioned within the recess (40). More particularly the retaining washer (28) is held between the head section (66) of the bolt (60) and the retaining pin (26) when the bolt (60) and the retaining pin (26) are fastened together.
The purpose of the retaining washer (28) is to restrain axial movement of the retaining pin (26) and thus prevent the tooth (24) from separating from the adapter (22). As a result, the retaining washer (28) should have a diameter which is adapted to be greater than both the diameter of the transverse bore (36) and the diameter of the aperture (38) which is adjacent to the recess (40) when the tooth (24) and the adapter (22) are in the connecting configuration.
The retaining washer (28) defines a washer bore (74) so that the retaining washer (28) can be mounted on the washer mounting section (68) of the bolt (60). In order that the retaining washer (28) can remain in fixed axial position relative to the retaining pin (26), the diameter of the washer bore (74) is preferably less than the outer diameter of the retaining pin (26) and the diameter of the washer bore (74) is also preferably less than the diameter of the head section (66) of the bolt (60).
Where the fastener (30) is a removable fastener, it is intended during normal use of the retaining pin assembly (20) that each of the retaining pin (26), the retaining washer (28) and the fastener (30) may be reused. Where the fastener (30) is a non-removable fastener or where the fastener (30) becomes stuck, it is either necessary or desirable that a backup disassembly mechanism be provided for the retaining pin assembly (20). The use of this backup disassembly mechanism may result in damage to or destruction of one or more of the parts of the retaining pin assembly (20).
In preferred embodiments of the invention, the backup disassembly mechanism is provided by modifying the retaining washer (28) to provide a shearing mechanism such that the retaining washer (28) defines a shear plane (75) for shearing of the retaining washer (28).
Referring to Figure 2 and to Figures 7 - 12, the shear plane (75) is preferably comprised of a groove (76) in the retaining washer (28) which provides a region or area of the retaining washer (28) which has a shearable thickness which is relatively easy to shear upon the application of an axial driving force to either the retaining pin (26) or to the bolt (60).
In the embodiment of Figure 1 to Figure 12, the groove (76) is generally coincident with the bore interface (42) and is thus an annular shaped groove.
This configuration enables the retaining pin (26) to be removed from the transverse bore (36) from either side of the adapter (22). Alternatively, the groove (76) may be coincident with the diameter of the aperture (38) which is adjacent to the recess (40), in which case it would be possible only to remove the retaining pin (26) from the transverse bore (36) in one direction.
In any event, the shearing mechanism must provide a shear eccentricity in which an applied shear force and the reaction shear force are applied on opposite sides of the groove (76). Refernng to Figure 12, an illustration is provided of shear eccentricity resulting from the application of an axial driving force to either the retaining pin (26) or to the bolt (60).
The retaining washer (28) may be designed to shear at a particular applied driving force by considering both the shape of the profile of the groove (76) and the depth of the groove (76). The shape of the profile of the groove (76) is preferably also designed to provide maximum tolerance to accommodate "play" or lateral movement of the retaining pin assembly (20) relative to the transverse bore (36). Referring to Figures 7 -11, exemplary shapes for the profile of the groove (76) are provided. In the embodiment as depicted in Figure 2 and Figure 12 the shape of the profile of the groove (76) is comprised of a symmetrical truncated cone.
In operation, the retaining pin assembly (20) of the embodiments of Figure 1 to Figure 12 may be assembled as follows. First, the retaining washer (28) is positioned in the recess (40). Second, the tooth (24) and the adapter (22) are positioned in the connecting configuration so that the transverse bore (36) and the apertures (38) are in substantial alignment. Third, one of the retaining pin (26) and the fastener (30) is inserted in the transverse bore (36). Fourth, the other of the retaining pin (26) and the fastener (30) is inserted in the transverse bore (36) and the fastener (30) is connected with the retaining pin (26) to fasten the retaining washer (28) to the retaining pin (26). The fastener (30) is connected with the retaining pin (26) by making up the threaded connection between the bolt (60) and the retaining pin (26).
Where the retaining pin (26) is hollow, debris which is present in the socket section (50) of the retaining pin (26) will be forced by the bolt (60) through the longitudinal bore (56) of the retaining pin (26) during assembly of the retaining pin assembly (20) so that the debris does not interfere with the assembly of the retaining pin assembly (20).
In operation, the retaining pin assembly (20) of the embodiments of Figure 1 to Figure 12 may be disassembled as follows. First, the fastener (30) is disconnected from the retaining pin (26). The fastener (30) is disconnected from the retaining pin (26) by breaking down the threaded connection between the bolt (60) and the retaining pin (26).
Alternatively, an axial driving force may be applied to the retaining pin (26) or to the bolt (60) to shear the retaining washer (28). Second, the retaining pin (26) is removed from the transverse bore (36).
Third, the tooth (24) is separated from the adapter (22). Fourth, the retaining washer (28) is removed from the recess (40).
The retaining pin (26) and the bolt (60) are preferably reused unless they are damaged. The retaining washer (28) may either be discarded or reused, depending upon whether it has been sheared during disassembly of the retaining pin assembly (20).
Where, as described above with respect to Figure 1 to Figure 12, the retaining pin assembly (20) includes the retaining pin (26), the retaining washer (28) and the fastener (30) as separate parts, the retaining pin assembly (20) may be used with little or no modification of the adapter (22) and/or the tooth (24). Typically, the only modification which may be required is the machining, casting or forging of the recess (40) in the adapter (22) and/or the tooth (24), if the recess (40) is not already provided.
Figure 13 to Figure 21 depict components of a second set of embodiments of the retaining pin assembly (20) and depict variations in features of the retaining pin assembly (20) which may be applicable to other embodiments of the invention, including the embodiments of Figure 1 to Figure 12.
The use of the embodiments depicted in Figure 1 to Figure 21 may require modification of either or both of the adapter (22) and the tooth (24). One example of such modification is depicted in Figure 22.
Refernng to Figure 13 and Figure 14, the retaining pin (26) is solid and is comprised of a plug section (78). The plug section (78) is located at the first end (46) of the retaining pin (26).
The retaining pin (26) also comprises the tool engagement surface (58), which is located adjacent to the second end (48) of the retaining pin (26). In Figure 13 the tool engagement surface (58) is comprised of both an external hexagonal surface for engaging a socket or wrench and an internal hexagonal surface for engaging an Allen wrench or similar tool. In Figure 14 the tool engagement surface (58) is comprised of both an external square surface for engaging a socket or wrench and an internal square surface for engaging a screwdriver, wrench or similar tool. It is not necessary to include both external and internal tool engagement surfaces (58) on the retaining pin (26), but there may be advantages to doing so.
The plug section (78) of the retaining pin (26) includes pin threads (52) which are external threads. The plug section (78) of the retaining pin (26) also comprises the pin shoulder (54).
Referring to Figure 15 to Figure 21, various embodiments of an integrated retainer component (80) are depicted. The integrated retainer component (80) is preferably forged from a single piece of a suitable material such as steel. The integrated retainer component (80) comprises both the retaining washer (28) and the fastener (30).
The fastener (30) in Figure 15 to Figure 21 is comprised of a nut (82) which is compatible with the plug section (78) of the retaining pin (26). The nut (82) includes fastener threads (62). The fastener threads (62) are internal threads which are complementary with the pin threads (52). The fastener (30) is further comprised of the fastener shoulder (70) which is configured to engage the pin shoulder (54) on the retaining pin (26).
Alternatively, if the retaining pin (26) defines a socket section (50) as in the embodiments of Figure 1 to Figure 12, the fastener (30) of the integrated retainer component (80) may be comprised of a bolt, screw or other suitable externally threaded component. In either case, the retaining washer (28) defines the washer bore (74).
As depicted in Figure 15, Figure 16 and Figure 19, the retaining washer (28) has a peripheral shape which is round, resulting in the possibility that the integrated retainer component (80) may be capable of rotation relative to the recess (40) when the retaining pin assembly (20) is in the assembled configuration. Consequently, the integrated retainer component (80) of Figure 15, Figure 16 and Figure 19 preferably comprises the tool engagement surface (72) so that the fastener (30) can be engaged by a tool (not shown). Where the fastener (30) is a nut (82) or similar device as in Figure 15 to Figure 21, the tool engagement surface (72) is preferably an external surface so that the internal fastener threads (62) can be accommodated.
As depicted in Figure 17, Figure 18, Figure 20 and Figure 21, the retaining washer (28) is comprised of a recess engaging surface (84) which is adapted to engage the recess (40) in order to inhibit rotation of the integrated retainer component (80) relative to the recess (40). In Figure 17 and Figure 20 the recess engaging surface (84) is a hexagonal surface.
In Figure 18 and Figure 21 the recess engaging surface (84) is a square surface. In the embodiments of integrated retainer component (80) depicted in Figure 17, Figure 18, Figure 20 and Figure 21 the recess (40) is configured to be complementary with the recess engaging surface (84).
The retaining washer (28) in each of the embodiments of the integrated retainer component (80) depicted in Figure 15 to Figure 21 is comprised of the shear plane (75) which will facilitate shearing of the retaining washer (28) in the event that the fastener (30) cannot be disconnected from the retaining pin (26) during disassembly of the retaining pin assembly (20).
In Figure 15 the shear plane (75) is comprised of the groove (76) in the retaining washer which provides a region of shearable thickness in the retaining washer (28). As depicted in Figure 15 the groove (76) is adapted to be generally coincident with the bore interface (42) when the retaining pin assembly (20) is in the assembled configuration and includes a profile having the shape of an asymmetrical truncated cone.
In Figure 16, Figure 17 and Figure 18 the shear plane (75) is comprised of a region of shearable thickness which is not in the configuration of a groove but is instead a circular area of reduced thickness formed in the retaining washer (28). The region of shearable thickness as depicted in Figure 16, Figure 17 and Figure 18 is adapted to overlap with the bore interface (42) when the retaining pin assembly (20) is in the assembled configuration.
In Figure 19, Figure 20 and Figure 21 the shear plane (75) is comprised of an overall shearable thickness of the retaining washer (28) so that the retaining washer (28) is relatively thin.
The use of the integrated retainer component (80) which combines the retaining washer (28) and the fastener (30) into a single component may require some modification to be made to either or both of the adapter (22) and the tooth (24) to facilitate assembly of the retaining pin assembly (20). The reason for this is that the fastener (30) will typically be designed to extend outward from the adapter (22) past the member interface (34) when the retaining pin assembly (20) is in the assembled configuration.
As a result, where the integrated retainer component (80) is provided, the assembly of the retaining pin assembly (20) will require that the adapter (22) and the tooth (24) be placed in the connecting configuration before the retaining washer (28) is positioned in the recess (40). This in turn will require that a structure or mechanism be provided to enable the retaining washer (28) to be positioned in the recess (40) when the adapter (22) and the tooth (24) are in the connecting configuration. Any suitable structure or mechanism may be utilized which facilitates both the assembly and disassembly of the retaining pin assembly (20) and which facilitates the functioning of the retaining pin assembly (20) while it is assembled.
Referring to Figure 22 and Figure 23, a preferred modification to the adapter (22) and the tooth (24) is depicted. A groove (86) is provided in an interior surface (92) of the tooth (24) which extends from an open end (88) of the tooth (24) to the aperture (38). The groove (86) accommodates the fastener (30) during assembly of the retaining pin assembly (20).
The groove (86) is preferably sized to be only slightly wider than the diameter of the fastener (30).
A corresponding groove (90) is provided along an exterior surface (93) of the adapter (22). The groove (90) accommodates the retaining washer (28) during assembly of the retaining pin assembly (20). Alternatively, the groove (90) could be provided along the interior surface (92) of the tooth (24) or alternatively the adapter (22) and the tooth (24) could be designed to provide sufficient clearance between them to accommodate the retaining washer (28) without providing the groove (90). Where provided, the groove (90) is preferably sized to be only slightly wider than the diameter of the retaining washer (28).
Instead of the groove (86), the tooth (24) could be provided with a slot (not shown) extending through the tooth (24) for accommodating the fastener (30).
In addition, instead of providing the groove (90) for accommodating the retaining washer (28) in one of the interior surface (92) of the tooth (24) and the exterior surface (93) of the adapter (22), the groove (90) may be provided in both the interior surface (92) of the tooth (24) and the exterior surface (93) of the adapter (22).
The groove (86) or slot (not shown) for accommodating the fastener (30) and the groove (90) for accommodating the retaining washer (28) may be configured in any manner 1 S which facilitates moving the retaining washer (28) into position in the recess (40).
Referring to Figure 22, the groove (86) and the groove (90) are, however, preferably configured to approach and encounter the aperture (38) in a straight line in order to simplify the task of moving the retaining washer (28) into position in the recess (40).
As a result, in the embodiment depicted in Figure 22, the groove (86) and the groove (90) extend in a straight line from the open end (88) of the tooth (24) to the aperture (38), but alternative conf gurations are possible. As one alternative configuration, the groove (86) and the groove (90) may extend in a straight line from a bottom end (94) of the tooth (24) to the aperture (38), but this configuration will require further modification of the tooth (24) to provide an aperture (not shown) to facilitate insertion of the retaining washer (28) into the tooth (24). As a second alternative configuration, the groove (86) and the groove (90) may extend in an L-shape (or some other shape) from the open end (88) of the tooth (24) to the aperture (38), but this configuration may complicate the task of moving the retaining washer (28) into position in the recess (40) In operation, the retaining pin assembly (20) of the embodiments of Figure 13 to Figure 21 may be assembled as follows in relation to the adapter (22) and the tooth (24) of Figure 22 and Figure 23. First, the tooth (24) and the adapter (22) are positioned in the connecting configuration so that the transverse bore (36) and the apertures (38) are in substantial alignment. Second, the integrated retainer component (80) is inserted in the groove (86) and groove (90) and moved to the aperture (38). Third, the retaining pin (26) is inserted in the transverse bore (36) and the fastener (30) is connected with the retaining pin (26) to fasten the retaining washer (28) to the retaining pin (26). The fastener (30) is connected with the retaining pin (26) by making up the threaded connection between the nut (82) and the retaining pin (26).
In operation, the retaining pin assembly (20) of the embodiments of Figure 13 to Figure 21 may be disassembled as follows in relation to the adapter (22) and the tooth (24) of Figure 22 and Figure 23. First, the retaining pin (26) is disconnected from the fastener (30) by breaking down the threaded connection between the nut (82) and the retaining pin (26).
Alternatively, an axial driving force may be applied to the retaining pin (26) or to the nut (82) to shear the retaining washer (28). Second, the retaining pin (26) is removed from the transverse bore (36). Third, if it has not been necessary to shear the retaining washer (28), the retaining washer (28) is removed from the recess (40) and the integrated retainer component (80) is moved along the groove (86) and the groove (90) and removed from the open end (88) of the tooth (24). Alternatively, if it has been necessary to shear the retaining washer (28), the fastener (30) may be removed by passing it through the aperture (38), leaving the retaining washer (28) positioned in the recess (40). Fourth, the tooth (24) is separated from the adapter (22).
The retaining pin (26) is preferably reused unless it is damaged. The integrated retainer component (80) may either be discarded or reused, depending upon whether the retaining washer (28) has been sheared during disassembly of the retaining pin assembly (20).
The shear plane is designed to be generally coincident with a plane which will facilitate removal of the retaining pin from the transverse bore. For example, the shear plane may be generally coincident with either the diameter of the aperture which is positioned adjacent to the recess or with the diameter of the transverse bore. Preferably the shear plane is generally coincident with the smaller of these two diameters so that the retaining pin can be removed from the transverse bore from either side of the first member. If the shear plane is generally coincident with the diameter of the transverse bore, it is more particularly preferably generally coincident with the bore interface in order to provide for a clear line of shear between an axial driving force acting on either the retaining pin or the fastener and a reaction force 1 S acting on the retaining washer.
Preferably the shear plane is provided by a region of shearable thickness or an overall shearable thickness of the retaining washer. In some embodiments the shearable thickness is provided as a groove in the retaining washer. Alternatively the shearable thickness may be provided as a region of shearable thickness in the retaining washer or an overall shearable thickness of the retaining washer.
Where the shearable thickness is provided by a groove, the groove preferably generally coincides with the bore interface and the transverse bore.
Alternatively, the groove could generally coincide with the diameter of the aperture which is positioned adjacent to the recess. Preferably the groove is an annular groove. The groove provides a region of reduced thickness in the retaining washer which is relatively more easy to shear than the remainder of the retaining washer.
The groove may be comprised of a profile which is either symmetrical or asymmetrical. The profile may be comprised of any shape and depth. Exemplary shapes include a cone, a parabola, a circle, a rectangle, a triangle and an ellipse, which shapes may be complete or truncated. In some preferred embodiments the shape of the profile is comprised of a truncated cone.
The retaining pin assembly is preferably designed so that the assembled configuration and the assembled length of the retaining pin assembly are defined during the assembly of the retaining pin assembly. Any device, structure or mechanism which is effective to accomplish this objective may be utilized.
For example, the retaining pin may be comprised of a pin shoulder and the fastener may be comprised of a complementary fastener shoulder, which shoulders are configured to engage each other to define the assembled configuration of the retaining pin assembly. In other words, the shoulders engage each other to limit the movement of the fastener relative to the retaining pin.
In one preferred embodiment, the bolt is comprised of a plug section, a head section and a washer mounting section located between the plug section and the head section.
In this preferred embodiment the fastener threads are located on the plug section.
In this preferred embodiment, the retaining washer defines a washer bore and the retaining pin has an outer diameter. Preferably the diameter of the washer bore is less than the outer diameter of the retaining pin. Furthermore, in this preferred embodiment the head section of the bolt and the washer mounting section of the bolt each have a diameter.
Preferably the diameter of the washer mounting section is less than the diameter of the washer bore and preferably the diameter of the washer bore is less than the diameter of the head section. In this preferred embodiment, the retaining pin and the bolt may be comprised of complementary shoulders such as a pin shoulder and a bolt shoulder which are configured to engage each other to define the assembled configuration of the retaining pin assembly.
Preferably the retaining pin is further comprised of a tool engagement surface for facilitating assembly and/or disassembly of the retaining pin assembly. In some embodiments _g_ each of the retaining pin and the fastener are preferably comprised of a tool engagement surface for facilitating assembly and/or disassembly of the retaining pin assembly.
The tool engagement surfaces may be comprised of any suitable surface or surfaces and may be comprised of external surfaces, internal surfaces or combinations thereof.
Where the fastener and the retaining pin are connected with a threaded connection, the tool engagement surfaces may be comprised of suitable engagement surfaces for engaging a tool which is compatible with a threaded connection, such as a wrench or a screwdriver. For example, the tool engagement surfaces may be comprised of external surfaces such as hexagonal surfaces or square surfaces for engaging a tool such as a socket, wrench or pliers, or the tool engagement surfaces may be comprised of internal surfaces for engaging a tool such as an Allen wrench or a screwdriver.
Where the fastener and the retaining pin are connected with a threaded connection and where the retaining pin assembly is comprised of the integrated retainer component, the tool engagement surface on the fastener may be substituted by providing the retaining washer with a recess engaging surface which is adapted to engage the recess in order to inhibit rotation of the integrated retainer component relative to the recess. The recess engaging surface may be comprised of any suitable surface, including a hexagonal surface, a square surface or some other "non-circular" shape which defines the periphery of the retaining washer.
Where the fastener and the retaining pin are connected with a different type of connection, the tool engagement surfaces may be comprised of any suitable surface such as necks or hooks for applying an appropriate force to the fastener and the retaining pin.
Where tool engagement surfaces are provided on each of the retaining pin and the fastener, the tool engagement surfaces are preferably located adjacent to opposite ends of the retaining pin assembly when it is in the assembled configuration, so that one of the tool engagement surfaces can be accessed from each end of the retaining pin assembly.
For example, where the retaining pin defines a socket section, the socket section of the retaining pin may be located adjacent to the first end of the retaining pin, the tool engagement surface on the retaining pin may be located adjacent to the second end of the retaining pin, and the tool engagement surface on the fastener may be located on the head section of the bolt.
Where a tool engagement surface is provided only on the retaining pin, the tool engagement surface is preferably located adjacent to one end of the retaining pin assembly when it is in the assembled configuration so that it can be accessed from an end of the retaining pin assembly.
BRIEF DESCRIPTION OF DRAWINGS
Embodiments of the invention will now be described with reference to the accompanying drawings, in which:
Figure 1 is a side view of a replaceable tooth connected with an adapter on a piece of earthworking equipment using a retaining pin assembly according to a preferred embodiment of the invention.
Figure 2 is a transverse partial section view of the retaining pin assembly of Figure 1 taken along Section A - A from Figure 1.
Figure 3 is a partial section view and an end view of a retaining pin according to a preferred embodiment of the invention, including a longitudinal bore and a square external tool engagement surface.
Figure 4 is a partial section view and an end view of a retaining pin according to a preferred embodiment of the invention, including a longitudinal bore and a hexagonal external tool engagement surface.
Figure 5 is a side view of a fastener according to a preferred embodiment of the invention, including a hexagonal external tool engagement surface.
Figure 6 is a side view of a fastener according to a preferred embodiment of the invention, including a square external tool engagement surface.
Figure 7 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of a symmetrical truncated cone.
Figure 8 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of an asymmetrical truncated cone.
Figure 9 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of a symmetrical truncated parabola.
Figure 10 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of an asymmetrical truncated parabola.
Figure 11 is a transverse section view of a retaining washer according to a preferred embodiment of the invention, including a shear plane comprising a groove with a profile in the shape of a rectangle.
Figure 12 is a schematic representation of shear forces experienced by a retaining washer according to a preferred embodiment of the invention as a result of an axial driving force being applied to either the retaining pin or to the fastener.
Figure 13 is a side view and an end view of a solid retaining pin according to a preferred embodiment of the invention, including both a hexagonal external tool engagement surface and a hexagonal internal tool engagement surface.
S Figure 14 is a side view and an end view of a solid retaining pin according to a preferred embodiment of the invention, including both a square external tool engagement surface and a square internal tool engagement surface.
Figure 15 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal external tool engagement surface, a circular retaining washer and a shear plane comprising a groove with a profile in the shape of an asymmetrical truncated cone.
Figure 16 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal external tool engagement surface, a circular retaining washer and a shear plane comprising a region of shearable thickness in the retaining washer.
Figure 17 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal retaining washer and a shear plane comprising a region of shearable thickness in the retaining washer.
Figure 18 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a square retaining washer and a shear plane comprising a region of shearable thickness in the retaining washer.
Figure 19 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal external tool engagement surface, a circular retaining washer and a shear plane comprising an overall shearable thickness of the retaining washer.
Figure 20 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a hexagonal retaining washer and a shear plane comprising an overall shearable thickness of the retaining washer.
Figure 21 is a side view and an end view of an integrated retainer component according to a preferred embodiment of the invention, including a square retaining washer and a shear plane comprising an overall shearable thickness of the retaining washer.
Figure 22 is a side view of a first member and a second member which have been modified to facilitate use of an integrated retainer component according to a preferred embodiment of the invention.
Figure 23 is a transverse partial section view of the first member and the second member of Figure 22 taken along Section C - C from Figure 22.
DETAILED DESCRIPTION
Preferred embodiments of the invention are depicted in Figure 1 to Figure 21.
Figure 1 to Figure 12 depict a first set of embodiments. Figure 13 to Figure 21 depict components of a second set of embodiments. Figure 22 and Figure 23 depict modifications to a first member and a second member which have been made to accommodate the embodiments of the invention depicted in Figure 13 to Figure 21.
The embodiments depicted in Figure 1 to Figure 21 are intended only to provide illustration of specific preferred applications of various features of the invention. Many of the features of the invention are applicable through a wide range of embodiments, all within the scope of the invention. In the Figures and in the description that follows, common reference numbers are used to describe elements which are common to the various embodiments.
Referring to Figure 1, a retaining pin assembly (20) is shown in an assembled configuration in which a first member consisting of an adapter (22) is in a connecting configuration with a second member consisting of a tooth (24) for a piece of earthworking equipment (not shown).
Referring to Figure 2, the retaining pin assembly (20) is depicted in the assembled configuration. The retaining pin assembly (20) includes a retaining pin (26), a retaining washer (28) and a fastener (30) for fastening the retaining washer (28) to the retaining pin (26).
Referring to Figure 2, the tooth (24) includes a pair of sidewalls (32) which straddle the adapter (22) and provide a member interface (34) between the adapter (22) and each of the sidewalk (32). The adapter (22) includes a transverse bore (36) and each of the sidewalk (32) includes an aperture (38). A recess (40) is defined by the adapter (22) adjacent to one of the member interfaces (34). The transverse bore (36), the apertures (38) and the recess (40) are all substantially in axial alignment.
The retaining pin (26) is positioned in the transverse bore (36) such that a bore interface (42) is provided between the retaining pin (26) and the transverse bore (36). The retaining pin assembly (20) in the assembled configuration has an assembled length (44). The assembled length (44) is greater than the distance between the member interfaces (34) so that the retaining pin assembly (20) protrudes into each of the apertures (38), thus preventing the tooth (24) from separating from the adapter (22).
The retaining pin (26) has a first end (46) and a second end (48). Referring to Figure 3 and Figure 4, a socket section (50) of the retaining pin (22) is provided adjacent to the first end (46) of the retaining pin (26). The socket section (50) includes pin threads (52) and a pin shoulder (54). The socket section (50), including the pin threads (52) and the pin shoulder (54), are designed to be complementary with corresponding structures on the fastener (30).
The retaining pin (26) preferably defines a longitudinal bore (56) and is therefore preferably hollow along its length in order to prevent the accumulation of debris in the socket section (50), which debris could interfere with the assembly and disassembly of the retaining pin assembly (20). The longitudinal bore (56) includes the socket section (50).
A tool engagement surface (58) is provided adjacent to the second end (48) of the retaining pin (26). The tool engagement surface (58) facilitates gripping of the retaining pin (26) by a tool (not shown) during assembly and disassembly of the retaining pin assembly (20).
Preferably the tool engagement surface (58) is designed to accommodate a socket or a wrench and is preferably comprised of either a square surface as in Figure 3 or a hexagonal surface as in Figure 4.
The purpose of the fastener (30) is to fasten the retaining washer (28) to the retaining pin (26). The fastener (30) is preferably a removable fastener, but the fastener (30) could also permanently fasten the retaining washer (28) to the retaining pin (26). If the fastener (30) is a removable fastener, then a shearing mechanism such as described below is optional. If the fastener (30) is non-removable, then a shearing mechanism as described below or some other disassembly mechanism will be required.
In the embodiments of Figure 1 to Figure 21, the fastener (30) and the retaining pin (26) together provide a threaded connection so that the retaining pin (26) is comprised of the pin threads (52) and the fastener (30) is comprised of a bolt (60) having complementary fastener threads (62). The retaining pin assembly (20) may be designed so that the pin threads (52) are either external threads or internal threads.
In the embodiment of Figure 1 to Figure 12 where the retaining pin (26) is comprised of the socket section (50), the pin threads (52) are internal threads which line the socket section (SO) and the fastener threads (62) are external threads.
Refernng to Figure 5 and Figure 6, the bolt (60) is comprised of a plug section (64), a head section (66) and a washer mounting section (68) which is between the plug section (64) and the head section (66). In addition, the fastener threads (62) are comprised of external threads on the plug section (64) of the bolt (60) and the bolt (60) is further comprised of a fastener shoulder (70).
The pin threads (52) and the fastener threads (62) engage each other to provide the threaded connection between the bolt (60) and the retaining pin and the pin shoulder (54) and the fastener shoulder (70) engage each other to limit the travel of the bolt (60) within the retaining pin (26) and thus define the assembled configuration of the retaining pin assembly (20).
The head section (66) of the bolt (60) is provided with a tool engagement surface (72) so that the fastener (30) may be engaged by a tool (not shown).
Preferably the tool engagement surface (58) on the retaining pin (26) is similar or identical to the tool engagement surface (72) on the fastener (30). For example, the tool engagement surface (72) on the bolt (60) may be comprised of a hexagonal surface as in Figure S or a square surface as in Figure 6.
The retaining washer (28) is designed to be fastened to the retaining pin (26) with the fastener (30). Referring to Figure 2, in the assembled configuration of the embodiment of Figure 1 to Figure 12 the retaining washer (28) is positioned on the washer mounting section (68) of the bolt (60) and is also positioned within the recess (40). More particularly the retaining washer (28) is held between the head section (66) of the bolt (60) and the retaining pin (26) when the bolt (60) and the retaining pin (26) are fastened together.
The purpose of the retaining washer (28) is to restrain axial movement of the retaining pin (26) and thus prevent the tooth (24) from separating from the adapter (22). As a result, the retaining washer (28) should have a diameter which is adapted to be greater than both the diameter of the transverse bore (36) and the diameter of the aperture (38) which is adjacent to the recess (40) when the tooth (24) and the adapter (22) are in the connecting configuration.
The retaining washer (28) defines a washer bore (74) so that the retaining washer (28) can be mounted on the washer mounting section (68) of the bolt (60). In order that the retaining washer (28) can remain in fixed axial position relative to the retaining pin (26), the diameter of the washer bore (74) is preferably less than the outer diameter of the retaining pin (26) and the diameter of the washer bore (74) is also preferably less than the diameter of the head section (66) of the bolt (60).
Where the fastener (30) is a removable fastener, it is intended during normal use of the retaining pin assembly (20) that each of the retaining pin (26), the retaining washer (28) and the fastener (30) may be reused. Where the fastener (30) is a non-removable fastener or where the fastener (30) becomes stuck, it is either necessary or desirable that a backup disassembly mechanism be provided for the retaining pin assembly (20). The use of this backup disassembly mechanism may result in damage to or destruction of one or more of the parts of the retaining pin assembly (20).
In preferred embodiments of the invention, the backup disassembly mechanism is provided by modifying the retaining washer (28) to provide a shearing mechanism such that the retaining washer (28) defines a shear plane (75) for shearing of the retaining washer (28).
Referring to Figure 2 and to Figures 7 - 12, the shear plane (75) is preferably comprised of a groove (76) in the retaining washer (28) which provides a region or area of the retaining washer (28) which has a shearable thickness which is relatively easy to shear upon the application of an axial driving force to either the retaining pin (26) or to the bolt (60).
In the embodiment of Figure 1 to Figure 12, the groove (76) is generally coincident with the bore interface (42) and is thus an annular shaped groove.
This configuration enables the retaining pin (26) to be removed from the transverse bore (36) from either side of the adapter (22). Alternatively, the groove (76) may be coincident with the diameter of the aperture (38) which is adjacent to the recess (40), in which case it would be possible only to remove the retaining pin (26) from the transverse bore (36) in one direction.
In any event, the shearing mechanism must provide a shear eccentricity in which an applied shear force and the reaction shear force are applied on opposite sides of the groove (76). Refernng to Figure 12, an illustration is provided of shear eccentricity resulting from the application of an axial driving force to either the retaining pin (26) or to the bolt (60).
The retaining washer (28) may be designed to shear at a particular applied driving force by considering both the shape of the profile of the groove (76) and the depth of the groove (76). The shape of the profile of the groove (76) is preferably also designed to provide maximum tolerance to accommodate "play" or lateral movement of the retaining pin assembly (20) relative to the transverse bore (36). Referring to Figures 7 -11, exemplary shapes for the profile of the groove (76) are provided. In the embodiment as depicted in Figure 2 and Figure 12 the shape of the profile of the groove (76) is comprised of a symmetrical truncated cone.
In operation, the retaining pin assembly (20) of the embodiments of Figure 1 to Figure 12 may be assembled as follows. First, the retaining washer (28) is positioned in the recess (40). Second, the tooth (24) and the adapter (22) are positioned in the connecting configuration so that the transverse bore (36) and the apertures (38) are in substantial alignment. Third, one of the retaining pin (26) and the fastener (30) is inserted in the transverse bore (36). Fourth, the other of the retaining pin (26) and the fastener (30) is inserted in the transverse bore (36) and the fastener (30) is connected with the retaining pin (26) to fasten the retaining washer (28) to the retaining pin (26). The fastener (30) is connected with the retaining pin (26) by making up the threaded connection between the bolt (60) and the retaining pin (26).
Where the retaining pin (26) is hollow, debris which is present in the socket section (50) of the retaining pin (26) will be forced by the bolt (60) through the longitudinal bore (56) of the retaining pin (26) during assembly of the retaining pin assembly (20) so that the debris does not interfere with the assembly of the retaining pin assembly (20).
In operation, the retaining pin assembly (20) of the embodiments of Figure 1 to Figure 12 may be disassembled as follows. First, the fastener (30) is disconnected from the retaining pin (26). The fastener (30) is disconnected from the retaining pin (26) by breaking down the threaded connection between the bolt (60) and the retaining pin (26).
Alternatively, an axial driving force may be applied to the retaining pin (26) or to the bolt (60) to shear the retaining washer (28). Second, the retaining pin (26) is removed from the transverse bore (36).
Third, the tooth (24) is separated from the adapter (22). Fourth, the retaining washer (28) is removed from the recess (40).
The retaining pin (26) and the bolt (60) are preferably reused unless they are damaged. The retaining washer (28) may either be discarded or reused, depending upon whether it has been sheared during disassembly of the retaining pin assembly (20).
Where, as described above with respect to Figure 1 to Figure 12, the retaining pin assembly (20) includes the retaining pin (26), the retaining washer (28) and the fastener (30) as separate parts, the retaining pin assembly (20) may be used with little or no modification of the adapter (22) and/or the tooth (24). Typically, the only modification which may be required is the machining, casting or forging of the recess (40) in the adapter (22) and/or the tooth (24), if the recess (40) is not already provided.
Figure 13 to Figure 21 depict components of a second set of embodiments of the retaining pin assembly (20) and depict variations in features of the retaining pin assembly (20) which may be applicable to other embodiments of the invention, including the embodiments of Figure 1 to Figure 12.
The use of the embodiments depicted in Figure 1 to Figure 21 may require modification of either or both of the adapter (22) and the tooth (24). One example of such modification is depicted in Figure 22.
Refernng to Figure 13 and Figure 14, the retaining pin (26) is solid and is comprised of a plug section (78). The plug section (78) is located at the first end (46) of the retaining pin (26).
The retaining pin (26) also comprises the tool engagement surface (58), which is located adjacent to the second end (48) of the retaining pin (26). In Figure 13 the tool engagement surface (58) is comprised of both an external hexagonal surface for engaging a socket or wrench and an internal hexagonal surface for engaging an Allen wrench or similar tool. In Figure 14 the tool engagement surface (58) is comprised of both an external square surface for engaging a socket or wrench and an internal square surface for engaging a screwdriver, wrench or similar tool. It is not necessary to include both external and internal tool engagement surfaces (58) on the retaining pin (26), but there may be advantages to doing so.
The plug section (78) of the retaining pin (26) includes pin threads (52) which are external threads. The plug section (78) of the retaining pin (26) also comprises the pin shoulder (54).
Referring to Figure 15 to Figure 21, various embodiments of an integrated retainer component (80) are depicted. The integrated retainer component (80) is preferably forged from a single piece of a suitable material such as steel. The integrated retainer component (80) comprises both the retaining washer (28) and the fastener (30).
The fastener (30) in Figure 15 to Figure 21 is comprised of a nut (82) which is compatible with the plug section (78) of the retaining pin (26). The nut (82) includes fastener threads (62). The fastener threads (62) are internal threads which are complementary with the pin threads (52). The fastener (30) is further comprised of the fastener shoulder (70) which is configured to engage the pin shoulder (54) on the retaining pin (26).
Alternatively, if the retaining pin (26) defines a socket section (50) as in the embodiments of Figure 1 to Figure 12, the fastener (30) of the integrated retainer component (80) may be comprised of a bolt, screw or other suitable externally threaded component. In either case, the retaining washer (28) defines the washer bore (74).
As depicted in Figure 15, Figure 16 and Figure 19, the retaining washer (28) has a peripheral shape which is round, resulting in the possibility that the integrated retainer component (80) may be capable of rotation relative to the recess (40) when the retaining pin assembly (20) is in the assembled configuration. Consequently, the integrated retainer component (80) of Figure 15, Figure 16 and Figure 19 preferably comprises the tool engagement surface (72) so that the fastener (30) can be engaged by a tool (not shown). Where the fastener (30) is a nut (82) or similar device as in Figure 15 to Figure 21, the tool engagement surface (72) is preferably an external surface so that the internal fastener threads (62) can be accommodated.
As depicted in Figure 17, Figure 18, Figure 20 and Figure 21, the retaining washer (28) is comprised of a recess engaging surface (84) which is adapted to engage the recess (40) in order to inhibit rotation of the integrated retainer component (80) relative to the recess (40). In Figure 17 and Figure 20 the recess engaging surface (84) is a hexagonal surface.
In Figure 18 and Figure 21 the recess engaging surface (84) is a square surface. In the embodiments of integrated retainer component (80) depicted in Figure 17, Figure 18, Figure 20 and Figure 21 the recess (40) is configured to be complementary with the recess engaging surface (84).
The retaining washer (28) in each of the embodiments of the integrated retainer component (80) depicted in Figure 15 to Figure 21 is comprised of the shear plane (75) which will facilitate shearing of the retaining washer (28) in the event that the fastener (30) cannot be disconnected from the retaining pin (26) during disassembly of the retaining pin assembly (20).
In Figure 15 the shear plane (75) is comprised of the groove (76) in the retaining washer which provides a region of shearable thickness in the retaining washer (28). As depicted in Figure 15 the groove (76) is adapted to be generally coincident with the bore interface (42) when the retaining pin assembly (20) is in the assembled configuration and includes a profile having the shape of an asymmetrical truncated cone.
In Figure 16, Figure 17 and Figure 18 the shear plane (75) is comprised of a region of shearable thickness which is not in the configuration of a groove but is instead a circular area of reduced thickness formed in the retaining washer (28). The region of shearable thickness as depicted in Figure 16, Figure 17 and Figure 18 is adapted to overlap with the bore interface (42) when the retaining pin assembly (20) is in the assembled configuration.
In Figure 19, Figure 20 and Figure 21 the shear plane (75) is comprised of an overall shearable thickness of the retaining washer (28) so that the retaining washer (28) is relatively thin.
The use of the integrated retainer component (80) which combines the retaining washer (28) and the fastener (30) into a single component may require some modification to be made to either or both of the adapter (22) and the tooth (24) to facilitate assembly of the retaining pin assembly (20). The reason for this is that the fastener (30) will typically be designed to extend outward from the adapter (22) past the member interface (34) when the retaining pin assembly (20) is in the assembled configuration.
As a result, where the integrated retainer component (80) is provided, the assembly of the retaining pin assembly (20) will require that the adapter (22) and the tooth (24) be placed in the connecting configuration before the retaining washer (28) is positioned in the recess (40). This in turn will require that a structure or mechanism be provided to enable the retaining washer (28) to be positioned in the recess (40) when the adapter (22) and the tooth (24) are in the connecting configuration. Any suitable structure or mechanism may be utilized which facilitates both the assembly and disassembly of the retaining pin assembly (20) and which facilitates the functioning of the retaining pin assembly (20) while it is assembled.
Referring to Figure 22 and Figure 23, a preferred modification to the adapter (22) and the tooth (24) is depicted. A groove (86) is provided in an interior surface (92) of the tooth (24) which extends from an open end (88) of the tooth (24) to the aperture (38). The groove (86) accommodates the fastener (30) during assembly of the retaining pin assembly (20).
The groove (86) is preferably sized to be only slightly wider than the diameter of the fastener (30).
A corresponding groove (90) is provided along an exterior surface (93) of the adapter (22). The groove (90) accommodates the retaining washer (28) during assembly of the retaining pin assembly (20). Alternatively, the groove (90) could be provided along the interior surface (92) of the tooth (24) or alternatively the adapter (22) and the tooth (24) could be designed to provide sufficient clearance between them to accommodate the retaining washer (28) without providing the groove (90). Where provided, the groove (90) is preferably sized to be only slightly wider than the diameter of the retaining washer (28).
Instead of the groove (86), the tooth (24) could be provided with a slot (not shown) extending through the tooth (24) for accommodating the fastener (30).
In addition, instead of providing the groove (90) for accommodating the retaining washer (28) in one of the interior surface (92) of the tooth (24) and the exterior surface (93) of the adapter (22), the groove (90) may be provided in both the interior surface (92) of the tooth (24) and the exterior surface (93) of the adapter (22).
The groove (86) or slot (not shown) for accommodating the fastener (30) and the groove (90) for accommodating the retaining washer (28) may be configured in any manner 1 S which facilitates moving the retaining washer (28) into position in the recess (40).
Referring to Figure 22, the groove (86) and the groove (90) are, however, preferably configured to approach and encounter the aperture (38) in a straight line in order to simplify the task of moving the retaining washer (28) into position in the recess (40).
As a result, in the embodiment depicted in Figure 22, the groove (86) and the groove (90) extend in a straight line from the open end (88) of the tooth (24) to the aperture (38), but alternative conf gurations are possible. As one alternative configuration, the groove (86) and the groove (90) may extend in a straight line from a bottom end (94) of the tooth (24) to the aperture (38), but this configuration will require further modification of the tooth (24) to provide an aperture (not shown) to facilitate insertion of the retaining washer (28) into the tooth (24). As a second alternative configuration, the groove (86) and the groove (90) may extend in an L-shape (or some other shape) from the open end (88) of the tooth (24) to the aperture (38), but this configuration may complicate the task of moving the retaining washer (28) into position in the recess (40) In operation, the retaining pin assembly (20) of the embodiments of Figure 13 to Figure 21 may be assembled as follows in relation to the adapter (22) and the tooth (24) of Figure 22 and Figure 23. First, the tooth (24) and the adapter (22) are positioned in the connecting configuration so that the transverse bore (36) and the apertures (38) are in substantial alignment. Second, the integrated retainer component (80) is inserted in the groove (86) and groove (90) and moved to the aperture (38). Third, the retaining pin (26) is inserted in the transverse bore (36) and the fastener (30) is connected with the retaining pin (26) to fasten the retaining washer (28) to the retaining pin (26). The fastener (30) is connected with the retaining pin (26) by making up the threaded connection between the nut (82) and the retaining pin (26).
In operation, the retaining pin assembly (20) of the embodiments of Figure 13 to Figure 21 may be disassembled as follows in relation to the adapter (22) and the tooth (24) of Figure 22 and Figure 23. First, the retaining pin (26) is disconnected from the fastener (30) by breaking down the threaded connection between the nut (82) and the retaining pin (26).
Alternatively, an axial driving force may be applied to the retaining pin (26) or to the nut (82) to shear the retaining washer (28). Second, the retaining pin (26) is removed from the transverse bore (36). Third, if it has not been necessary to shear the retaining washer (28), the retaining washer (28) is removed from the recess (40) and the integrated retainer component (80) is moved along the groove (86) and the groove (90) and removed from the open end (88) of the tooth (24). Alternatively, if it has been necessary to shear the retaining washer (28), the fastener (30) may be removed by passing it through the aperture (38), leaving the retaining washer (28) positioned in the recess (40). Fourth, the tooth (24) is separated from the adapter (22).
The retaining pin (26) is preferably reused unless it is damaged. The integrated retainer component (80) may either be discarded or reused, depending upon whether the retaining washer (28) has been sheared during disassembly of the retaining pin assembly (20).
Claims (32)
1. A retaining pin assembly for detachably connecting a first member and a second member, the first member defining a transverse bore extending therethrough, the second member comprising a pair of sidewalls for straddling the first member to provide a member interface between the first member and each of the sidewalk, each of the sidewalk defining an aperture, wherein the apertures are substantially axially aligned with the transverse bore when the first member and the second member are in a connecting configuration, wherein one of the first member and the second member defines a recess, wherein the recess is adjacent to one of the member interfaces and is in substantial axial alignment with the transverse bore and the apertures when the first member and the second member are in the connecting configuration, the retaining pin assembly comprising:
(a) a retaining pin for insertion in the transverse bore such that a bore interface is provided between the retaining pin and the transverse bore;
(b) a retaining washer for positioning in the recess; and (c) a fastener for fastening the retaining washer to the retaining pin.
(a) a retaining pin for insertion in the transverse bore such that a bore interface is provided between the retaining pin and the transverse bore;
(b) a retaining washer for positioning in the recess; and (c) a fastener for fastening the retaining washer to the retaining pin.
2. The retaining pin assembly as claimed in claim 1 wherein the retaining pin assembly has an assembled configuration, wherein the assembled configuration has an assembled length, and wherein the assembled length is adapted to be greater than a distance between the member interfaces when the first member and the second member are in the connecting configuration.
3. The retaining pin assembly as claimed in claim 2 wherein the retaining washer has a diameter and wherein the diameter of the retaining washer is adapted to be greater than both a diameter of the transverse bore and a diameter of the aperture which is adjacent to the recess when the first member and the second member are in the connecting configuration.
4. The retaining pin assembly as claimed in claim 3 wherein the retaining pin is comprised of pin threads and wherein the fastener is comprised of complementary fastener threads.
5. The retaining pin assembly as claimed in claim 4 wherein the retaining pin is comprised of a pin shoulder, wherein the fastener is comprised of a fastener shoulder, and wherein the pin shoulder and the fastener shoulder are configured to engage each other to define the assembled configuration of the retaining pin assembly.
6. The retaining pin assembly as claimed in claim 4 wherein the retaining pin defines a socket section, wherein the pin threads are comprised of internal threads in the socket section, wherein the fastener is comprised of a bolt, and wherein the fastener threads are comprised of external threads on the bolt.
7. The retaining pin assembly as claimed in claim 6 wherein the retaining pin defines a longitudinal bore extending through the retaining pin from a first end of the retaining pin to a second end of the retaining pin.
8. The retaining pin assembly as claimed in claim 7 wherein the longitudinal bore is comprised of the socket section.
9. The retaining pin assembly as claimed in claim 6 wherein the bolt is comprised of a plug section, wherein the bolt is further comprised of a head section, wherein the bolt is further comprised of a washer mounting section located between the plug section and the head section, and wherein the fastener threads are located on the plug section.
10. The retaining pin assembly as claimed in claim 9 wherein the retaining washer defines a washer bore, wherein the washer bore has a diameter, wherein the retaining pin has an outer diameter, and wherein the diameter of the washer bore is less than the outer diameter of the retaining pin.
11. The retaining pin assembly as claimed in claim 10 wherein the head section of the bolt has a diameter and wherein the diameter of the washer bore is less than the diameter of the head section.
12. The retaining pin assembly as claimed in claim 11 wherein the socket section of the retaining pin is comprised of a pin shoulder, wherein the bolt is comprised of a bolt shoulder, and wherein the pin shoulder and the bolt shoulder are configured to engage each other to define the assembled configuration of the retaining pin assembly.
13. The retaining pin assembly as claimed in claim 4 wherein the fastener is further comprised of a tool engagement surface on the fastener for facilitating assembly of the retaining pin assembly and wherein the retaining pin is further comprised of a tool engagement surface on the retaining pin for facilitating assembly of the retaining pin assembly.
14. The retaining pin assembly as claimed in claim 13 wherein the tool engagement surfaces are comprised of hexagonal surfaces, square surfaces or combinations thereof.
15. The retaining pin assembly as claimed in claim 13 wherein the retaining pin defines a socket section, wherein the pin threads are comprised of internal threads in the socket section, wherein the fastener is comprised of a bolt, and wherein the fastener threads are comprised of external threads on the bolt.
16. The retaining pin assembly as claimed in claim 15 wherein the socket section of the retaining pin is located adjacent to a first end of the retaining pin and wherein the tool engagement surface on the retaining pin is located adjacent to a second end of the retaining pin.
17. The retaining pin assembly as claimed in claim 16 wherein the bolt is comprised of a head section and wherein the tool engagement surface on the bolt is located on the head section.
18. The retaining pin assembly as claimed in claim 13 wherein the retaining pin is comprised of a plug section, wherein the pin threads are comprised of external threads on the plug section, wherein the fastener is comprised of a nut, and wherein the fastener threads are comprised of internal threads in the nut.
19. The retaining pin assembly as claimed in claim 18 wherein the plug section of the retaining pin is located adjacent to a first end of the retaining pin and wherein the tool engagement surface on the retaining pin is located adjacent to a second end of the retaining pin.
20. The retaining pin assembly as claimed in claim 3 wherein the retaining washer is comprised of a shear plane for shearing of the retaining washer.
21. The retaining pin assembly as claimed in claim 20 wherein the shear plane is comprised of a region of shearable thickness in the retaining washer.
22. The retaining pin assembly as claimed in claim 21 wherein the shear plane is comprised of a groove in the retaining washer and wherein the groove is adapted to be generally coincident with the bore interface.
23. The retaining pin assembly as claimed in claim 22 wherein the groove is comprised of a profile and wherein the profile is either symmetrical or asymmetrical.
24. The retaining pin assembly as claimed in claim 23 wherein the profile is comprised of a shape and wherein the shape is selected from the group of shapes consisting of a cone, a parabola, a circle, a rectangle, a triangle and an ellipse.
25. The retaining pin assembly as claimed in claim 21 wherein the retaining washer has an overall shearable thickness and wherein the shear plane is defined by the overall shearable thickness of the retaining washer.
26. The retaining pin assembly as claimed in claim 3 wherein the retaining washer assembly is comprised of an integrated retainer component and wherein the integrated retainer component is comprised of the retaining washer and the fastener.
27. The retaining pin assembly as claimed in claim 26 wherein the integrated retainer component is constructed of a material and wherein the integrated retainer component is constructed of a single piece of the material.
28. The retaining pin assembly as claimed in claim 26 wherein the retaining pin is comprised of pin threads and wherein the fastener is comprised of complementary fastener threads.
29. The retaining pin assembly as claimed in claim 28 wherein the retaining pin is comprised of a plug section, wherein the pin threads are comprised of external threads on the plug section, wherein the fastener is comprised of a nut, and wherein the fastener threads are comprised of internal threads in the nut.
30. The retaining pin assembly as claimed in claim 28 wherein the retaining pin defines a socket section, wherein the pin threads are comprised of internal threads in the socket section, wherein the fastener is comprised of a bolt, and wherein the fastener threads are comprised of external threads on the bolt.
31. The retaining pin assembly as claimed in claim 28 wherein the retaining washer is comprised of a recess engaging surface which is adapted to engage the recess in order to inhibit rotation of the integrated retainer component relative to the recess.
32. The retaining pin assembly as claimed in claim 31 wherein the recess engaging surface is comprised of a hexagonal surface or a square surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2455314 CA2455314A1 (en) | 2004-01-19 | 2004-01-19 | Retaining pin assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2455314 CA2455314A1 (en) | 2004-01-19 | 2004-01-19 | Retaining pin assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2455314A1 true CA2455314A1 (en) | 2005-07-19 |
Family
ID=34744404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2455314 Abandoned CA2455314A1 (en) | 2004-01-19 | 2004-01-19 | Retaining pin assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2455314A1 (en) |
-
2004
- 2004-01-19 CA CA 2455314 patent/CA2455314A1/en not_active Abandoned
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