Rail type sander
By designing dust collection components that combine low-density and high-density materials in a random track sander, the problem of incomplete dust removal during use of the equipment is solved, the balance and usage experience is improved, and the use of larger battery packs is supported.
Patent Information
- Application Number
- CN202421121150.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-04
- Filing Date
- 2024-05-21
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The existing random track sanders are difficult to effectively remove dust during use, which affects the balance and user experience of the equipment.
A dust collection assembly is designed that includes a combination of low-density and high-density materials through which the material combination provides a balance in front and rear of the motor axis, ensuring that the dust can be effectively guided out.
Achieve better dust removal effect, improve the balance and user experience of the equipment, and allows the use of a larger battery pack.
Smart Images
Figure CN222903529U_ABST
Abstract
Description
[0001] CROSS-REFERENCE TO RELATED APPLICATIONS
[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 468,091 filed on May 22, 2023 and U.S. Provisional Patent Application No. 63 / 605,709 filed on December 4, 2023, the entire contents of each of these U.S. Provisional Patent Applications are incorporated herein by reference. Technical Field
[0003] The present disclosure relates to random orbital sanders and, more particularly, to dust collection assemblies for random orbital sanders. Background Art
[0004] Random orbital sanders are used to smooth workpieces including wood, metal, etc. Improvements in these tools are always sought after in the industry. Utility Model Content
[0005] In one aspect, the present disclosure provides an orbital sander comprising: a housing; a motor within the housing, the motor comprising a motor shaft defining a motor axis; an eccentric drive unit coupled to the motor shaft and configured to convert rotation of the motor shaft into orbital motion about the motor axis; a battery receptacle for receiving a battery pack to provide current to the motor; a backing pad coupled to the eccentric drive unit for orbital motion about the motor axis; and a dust collection assembly adjacent to the backing pad and configured to direct dust away from the backing pad, wherein the orbital sander comprising the housing, the motor, the eccentric drive unit, the battery receptacle, the backing pad, and the dust collection assembly defines a center of gravity CG located on a first side of the motor axis adjacent to the battery receptacle. ROS , and wherein the dust collection assembly defines a center of gravity CG located on a second side of the motor axis opposite to the first side DCA .
[0006] In some aspects, the dirt collection assembly includes a first material having a first density and a second material having a second density, wherein the second density is greater than the first density, and wherein the second material is located forward of the motor axis.
[0007] In some aspects, a dust collection assembly includes a lower shroud and an upper shroud coupled to the lower shroud.
[0008] In some aspects, the lower shield includes a first lower portion and a second lower portion attached to the first lower portion.
[0009] In some aspects, the upper shield includes a first upper shield half having a first upper rear portion and a first upper front portion coupled to the first upper rear portion.
[0010] In some aspects, the upper shield includes a second upper shield half having a second upper rear portion and a second upper front portion coupled to the second upper rear portion.
[0011] In some aspects, the first lower portion of the lower shield, the first upper rear portion of the upper shield, and the second upper rear portion of the upper shield include a first material.
[0012] In some aspects, the second lower portion of the lower shield, the first upper front portion of the upper shield, and the second upper front portion of the upper shield include a second material.
[0013] In some aspects, the first material has a first density and the second material has a second density, and the second density is greater than the first density.
[0014] In some aspects, the second density is greater than or equal to five times the first density.
[0015] In some aspects, the first material is a polymer.
[0016] In some aspects, the second material is a metal.
[0017] In some aspects, the dust collection assembly is integrally formed with the housing.
[0018] In some aspects, the dust collection assembly is formed separately from the housing.
[0019] In some aspects, the orbital sander further includes a brake pad holder and a brake pad adjacent the first side of the backing pad.
[0020] In some aspects, the dust collection assembly at least partially surrounds the brake pad holder and the brake pad.
[0021] In some aspects, the brake pad bracket includes a first bracket portion located on a first side of the motor shaft and a second bracket portion located on a second side of the motor shaft, and the second bracket portion is heavier than the first bracket portion.
[0022] In some aspects, the dust collection assembly includes a first shield and a second shield, and the second shield includes a first portion located on a first side of the motor shaft and a second portion located on a second side of the motor shaft, and the second portion is heavier than the first portion.
[0023] In yet another aspect, the present disclosure provides an orbital sander comprising: a housing; a motor within the housing, the motor comprising a motor shaft defining a motor axis; an eccentric drive unit coupled to the motor shaft and configured to convert rotation of the motor shaft into orbital motion about the motor axis; a battery receptacle for receiving a battery pack to provide current to the motor; a backing pad coupled to the eccentric drive unit for orbital motion about the motor axis; and a brake pad holder and a brake pad adjacent a first side of the backing pad, wherein the orbital sander comprising the housing, the motor, the eccentric drive unit, the battery receptacle, the backing pad, and the dust collection assembly defines a center of gravity CG located on the first side of the motor axis adjacent the battery receptacle. ROS , and wherein the brake pad support defines a center of gravity CG located on a second side of the motor axis opposite to the first side DCA .
[0024] In some aspects, the orbital sander further includes a dust collection assembly adjacent the backing pad and configured to direct dust away from the backing pad, wherein the dust collection assembly includes a first material having a first density and a second material having a second density, wherein the second density is greater than the first density, and wherein the second material is located on a second side of the motor axis.
[0025] In another aspect, the present disclosure provides a dust collection assembly for an orbital sander, the dust collection assembly comprising a first shield and a second shield coupled to the first shield, wherein at least one of the first shield and the second shield comprises a low-density portion and a high-density portion, the low-density portion being located on a first side of a motor axis of the orbital sander on which the dust collection assembly is installed, and the high-density portion being located on a second side of the motor axis opposite to the first side.
[0026] In some aspects, the first shield is an upper shield and the second shield is a lower shield, and the upper shield is located above the lower shield.
[0027] In some aspects, the first shroud includes at least one low-density portion and at least one high-density portion, and wherein the at least one high-density portion is located on the second side of the motor axis.
[0028] In some aspects, the high density portion is heavier than the low density portion.
[0029] In some aspects, the lower shroud includes a first lower portion and a second lower portion.
[0030] In some aspects, the first lower portion is molded around the second lower portion.
[0031] In some aspects, the second lower portion is insert molded with the first lower portion.
[0032] In some aspects, the upper shield includes a first upper shield half and a second upper shield half attached to the first upper shield half along a seam.
[0033] In some aspects, the first upper shield half includes a first upper rear portion and a first upper front portion attached to the first upper rear portion, and the second upper shield half includes a second upper rear portion and a second upper front portion attached to the second upper rear portion.
[0034] In some aspects, the lower shroud defines a lower portion of the dust duct and the upper shroud defines an upper portion of the dust duct.
[0035] In yet another aspect, the present disclosure provides an orbital sander comprising: a housing; a motor within the housing, the motor comprising a motor shaft defining a motor axis; an eccentric drive unit coupled to the motor shaft and configured to convert rotation of the motor shaft into orbital motion about the motor axis; a battery receptacle for receiving a battery pack to provide current to the motor; a backing pad coupled to the eccentric drive unit for orbital motion about the motor axis; and a static balance member located within the housing, forward of the motor axis, and opposite the battery receptacle.
[0036] In some aspects, the static balance includes a portion of the brake pad holder within the housing adjacent the first side of the backing pad.
[0037] In some aspects, the static balance further includes a portion of a dust collection assembly at least partially surrounding the brake pad holder.
[0038] In some aspects, the brake pad bracket includes a first bracket portion located on a first side of the motor shaft.
[0039] In some aspects, the brake pad bracket includes a second bracket portion located on a second side of the motor shaft.
[0040] In some aspects, the second bracket portion is heavier than the first bracket portion.
[0041] In some aspects, the dust collection assembly includes a first shield and a second shield, and wherein the second shield includes a first portion located on a first side of the motor shaft.
[0042] In some aspects, the second shield further includes a second portion located on a second side of the motor shaft.
[0043] In some aspects, the second portion is heavier than the first portion.
[0044] In some aspects, the static balance is made of a material having a density greater than or equal to 5 g / cm3.
[0045] Other features and aspects of the present disclosure will become apparent by consideration of the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0046] Figure 1 is a stereogram of a random orbital sander.
[0047] Figure 2 yes Figure 1 Side view of a random orbital sander.
[0048] Figure 3 yes Figure 1 Bottom view of a random orbital sander.
[0049] Figure 4 It is along Figure 3 The line 4-4 is intercepted, Figure 1 Cross-sectional view of a random orbital sander.
[0050] Figure 5 yes Figure 1 A perspective view of the brake pad holder of a random orbital sander.
[0051] Figure 6 yes Figure 5 Side view of the brake pad holder.
[0052] Figure 7 yes Figure 1 A perspective view of the dust collection assembly of a random orbital sander.
[0053] Figure 8 yes Figure 7 A three-dimensional view of the lower shield of the dust collection assembly.
[0054] Fig. 9 yes Figure 7 An exploded perspective view of the lower shield of the dust collection assembly.
[0055] Fig.10 yes Figure 7 A three-dimensional view of the upper shield of the dust collection assembly.
[0056] Fig.11 yes Figure 7 An exploded perspective view of the upper shield of the dust collection assembly.
[0057] Fig.12 yes Figure 7 A top view of the dust collection assembly.
[0058] Fig.13 yes Figure 7 Side view of the dust collection assembly.
[0059] Fig.14 yes Figure 1An overhead view of the edge guard of a random orbital sander.
[0060] Fig.15 yes Figure 1 A side view of a random orbital sander with the edge guard partially disengaged from the dust collection assembly.
[0061] Fig.16 yes Figure 1 A perspective view of an alternative embodiment of a dust collection assembly for a random orbital sander.
[0062] Fig.17 yes Fig.16 A three-dimensional view of the lower shield of the dust collection assembly.
[0063] Fig.18 yes Fig.16 A three-dimensional view of the upper shield of the dust collection assembly.
[0064] Fig.19 yes Fig.16 An exploded perspective view of the upper shield of the dust collection assembly.
[0065] Fig. 20 yes Fig.16 A top view of the dust collection assembly.
[0066] Fig.21 yes Fig.16 Side view of the dust collection assembly.
[0067] Fig. 22 yes Fig.16 Front view of the dust collection assembly.
[0068] Fig.23 yes Fig.16 An overhead view of the edge guard of a random orbital sander.
[0069] Fig.24 is with Fig.16 The dust collection assembly is engaged Fig.23 Side view of an edge guard.
[0070] Fig.25 It is along Fig.24 The line 25-25 in Fig.24 Cross-sectional view of the edge guard and dust collection assembly.
[0071] Before explaining any embodiments of the present disclosure in detail, it should be understood that the scope or application of the embodiments described herein is not limited to the construction details and component arrangements set forth in the following description or as shown in the following figures. The devices described herein can have other embodiments and can be practiced or implemented in various ways. In addition, it should be understood that the words and terms used herein are for descriptive purposes and should not be considered limiting. DETAILED DESCRIPTION
[0072] refer to Figures 1 to 4 , a random orbital sander 100 is shown. The random orbital sander 100 includes a housing 102 having a first housing shell 104 joined to a second housing shell 106 along a seam 108. Further, the housing 102 includes a motor housing 110 extending along a motor axis 112. A handle housing 114 extends from the motor housing 110 along a handle axis 116. In a particular aspect, the handle axis 116 is perpendicular to the motor axis 112. The random orbital sander 100 further includes a battery receptacle 118 formed in the handle housing 114, the battery receptacle being configured to receive a battery pack. Specifically, the battery receptacle 118 includes a pair of parallel rails 120, 122 configured to receive complementary features on a removable battery pack. As such, the battery receptacle 118 is sized and shaped to slidably receive the removable battery pack therein. The removable battery pack can slide parallel to the handle axis 116 in a first direction toward the motor axis 112 to engage with the battery receptacle 118 and can slide in a second direction (opposite to the first direction) away from the motor axis 112 to disengage from the battery receptacle. In a particular aspect, the removable battery pack provides approximately 324 kilojoules of energy and weighs approximately 0.82 kilograms. Thus, the removable battery pack includes an energy density of approximately 395 kilojoules / kilogram.
[0073] As shown, the motor housing 110 includes a motor 130 disposed therein. For example, the motor 130 is a brushless direct current (BLDC) motor that receives current (i.e., power) from a removable battery pack that engages with the battery receptacle 118. The motor 130 includes a motor shaft 132 that rotates on a first bearing 134 and a second bearing 136. The motor shaft 132 defines a motor axis 112. In other words, the motor shaft 132 rotates around the motor axis 112. An eccentric drive unit 140 is coupled to the motor shaft 132. The motor shaft 132 drives the eccentric drive unit 140, and the eccentric drive unit 140 is configured to convert the rotation of the motor shaft 132 into an orbital motion around the motor axis 112. A backing pad 142 is removably attached to the eccentric drive unit 140. A sanding disc (not shown) is removably attached to the backing pad 142. Figure 4Further shown is a cooling fan 144 disposed on the motor shaft 132 above the second bearing 136. During operation of the random orbital sander 100, the cooling fan 144 rotates with the motor shaft 132 to draw air and heat away from the motor 130. An exhaust outlet 146 is formed in each of the housing shells 104, 106 that are opposite to each other to provide an air exit passage for the air flow generated by the cooling fan 144.
[0074] like Figure 4 As further shown in FIG. 1 , a dust extraction fan 148 is disposed on the motor shaft 132, below the second bearing 136, and above the eccentric drive unit 140 and the backing pad 142 mounted thereon. A dust collection assembly 150 surrounds the dust extraction fan 148. The dust collection assembly 150 is formed separately from the housing 102. Alternatively, the dust collection assembly 150 is integrally and monolithically formed with the housing 102. During operation, the dust extraction fan 148 rotates with the motor shaft 132 to extract air and dust from the backing pad 142 and blow the air and dust into a dust bag attached to the dust collection assembly 150. Figure 4 Further shown is a brake pad 152 removably mounted on a brake pad holder 154. The brake pad 152 is fixed relative to the brake pad holder 154, while the backing pad 142 rotates relative to the brake pad 152. The brake pad 152 is flexible and biased into contact with an upper surface 156 of the backing pad 142. When the motor 130 is powered off, the brake pad 152 decelerates the backing pad 142. The random orbital sander 100 further includes an edge guard 160 removably engaged with the random orbital sander 100. The edge guard 160 at least partially surrounds the backing pad 142 and prevents the random orbital sander 100 and its backing pad 142 from striking a vertical structure extending from a workpiece, such as an inner wall of a cabinet.
[0075] Figure 5 and Figure 6The brake pad bracket 154 is shown to include a first bracket portion 155 and a second bracket portion 157. In a particular embodiment, the brake pad bracket 154 is made of two different materials. In particular, the first bracket portion 155 is made of a first material. The second bracket portion 157 is made of a second material. The first material is a low-density material, and the second material is a high-density material. In particular, the first material has a first density D1, and the second material has a second density D2. In order to provide an acceptable balance for the random orbital sander 100, the second density D2 of the second material is greater than the first density D1 of the first material. In particular, the second density D2 is greater than or equal to 5.00 times the first density D1, such as greater than or equal to 5.20 times the first density D1, greater than or equal to 5.40 times the first density D1, greater than or equal to 5.60 times the first density D1, greater than or equal to 5.80 times the first density D1, greater than or equal to 6.00 times the first density D1, or greater than or equal to 6.20 times the first density D1. Further, the second density D2 is less than or equal to 8.00 times the first density D1, such as less than or equal to 7.80 times the first density D1, less than or equal to 7.60 times the first density D1, less than or equal to 7.40 times the first density D1, less than or equal to 7.20 times the first density D1, less than or equal to 7.00 times the first density D1, less than or equal to 6.80 times the first density D1, less than or equal to 6.60 times the first density D1, or less than or equal to 6.40 times the first density D1. In any case, the second bracket portion 157 is heavier than the first bracket portion 155 and acts as a static balance within the random orbital sander 100.
[0076] In another aspect, the first material is an antistatic plastic, such as a filled polymer. Further, the first material is polycaprolactam (also known as nylon 6) filled with carbon fibers. Still further, the first material is nylon 6 filled with 30% carbon fibers. In another aspect, the density D1 of the first material is less than or equal to 1.50 g / cm3, such as less than or equal to 1.45 g / cm3, less than or equal to 1.40 g / cm3, less than or equal to 1.35 g / cm3, less than or equal to 1.30 g / cm3, less than or equal to 1.25 g / cm3, or less than or equal to 1.20 g / cm3. On the other hand, the density D1 of the first material is greater than or equal to 0.75 g / cm3, such as greater than or equal to 0.80 g / cm3, greater than or equal to 0.85 g / cm3, greater than or equal to 0.90 g / cm3, greater than or equal to 0.95 g / cm3, greater than or equal to 1.00 g / cm3, greater than or equal to 1.05 g / cm3, greater than or equal to 1.10 g / cm3, or greater than or equal to 1.15 g / cm3. It should be understood that the density D1 can be within a range between and including any of the maximum and minimum values of the density D1 disclosed herein.
[0077] In yet another aspect, the second material is a metal or a metal alloy. For example, the second material is iron, steel, stainless steel, brass, bronze, nickel, tin, zinc, or a combination thereof. In a particular aspect, the density D2 of the second material is greater than or equal to 5.00 g / cm3, such as greater than or equal to 5.50 g / cm3, greater than or equal to 6.00 g / cm3, greater than or equal to 6.50 g / cm3, greater than or equal to 6.60 g / cm3, greater than or equal to 6.70 g / cm3, greater than or equal to 6.80 g / cm3, greater than or equal to 6.90 g / cm3, greater than or equal to 7.00 g / cm3, or greater than or equal to 7.10 g / cm3. In another aspect, the density D2 of the second material is less than or equal to 10.00 g / cm3, such as less than or equal to 9.50 g / cm3, less than or equal to 9.00 g / cm3, less than or equal to 8.50 g / cm3, less than or equal to 8.00 g / cm3, less than or equal to 7.90 g / cm3, less than or equal to 7.80 g / cm3, less than or equal to 7.70 g / cm3, less than or equal to 7.60 g / cm3, less than or equal to 7.50 g / cm3, less than or equal to 7.40 g / cm3, less than or equal to 7.30 g / cm3, or less than or equal to 7.20 g / cm3. It should be understood that the density D2 can be within a range between and including the minimum and maximum values of the density D2 disclosed herein.
[0078] Accordingly, the brake pad bracket 154 includes a low density portion (e.g., first bracket portion 155) located on a first side of the motor axis 112 adjacent to the battery receptacle 118 and the battery pack, e.g., behind the motor axis 112 of the random orbital sander 100 to which the brake pad bracket 154 is mounted, and a high density portion (e.g., second bracket portion 157) located on a second side of the motor axis 112 opposite the first side, e.g., in front of the motor axis 112. As such, the second bracket portion 157 provides additional weight in front of the motor axis 112 to account for the additional weight of a dust bag or canister mounted on the dust collection assembly 150 (or dust collection assembly 300 hereinafter) at a location away from the motor axis 112 and a battery (not shown) engaged with the battery receptacle 118 during use. The additional weight provided by the second bracket portion 157 serves to move the center of gravity of the random orbital sander 100 toward the motor axis 112 , which achieves greater balance of the random orbital sander 100 .
[0079] Figure 4 It is shown that the random orbital sander 100 includes a center of gravity CG ROS , and the center of gravity CG ROS Located behind the motor axis 112, that is, on the same side of the motor axis 112 as the handle housing 114. In addition, the center of gravity CG ROS Located at a distance D from the motor axis 112 ROS It should be understood that the center of gravity CG ROS is measured with the dust collection assembly 150 fully assembled and the brake pad holder 154 installed therein, and a removable battery pack (e.g., a removable battery pack having the energy density described above) engaged with the random orbital sander 100, and a full dust bag attached to the dust collection assembly 150. On the other hand, the center of gravity CG ROS CG is measured with the dust collection assembly 150 fully assembled and the brake pad holder 154 installed therein, and a removable battery pack (e.g., a removable battery pack having the energy density described above) engaged with the random orbital sander 100, and an empty dust bag attached to the dust collection assembly 150. In certain embodiments, the center of gravity CG ROS Distance D from motor axis 112 ROS Less than or equal to 50.00 mm, such as less than or equal to 49.50 mm, less than or equal to 49.00 mm, less than or equal to 48.50 mm, less than or equal to 48.00 mm, or less than or equal to 47.50 mm. In another specific embodiment, the center of gravity CG ROS Distance D from motor axis 112 ROSGreater than or equal to 42.50 mm, such as greater than or equal to 42.75 mm, greater than or equal to 43.00 mm, greater than or equal to 43.25 mm, greater than or equal to 43.50 mm, greater than or equal to 43.75 mm, greater than or equal to 44.00 mm, or greater than or equal to 44.25 mm. On the other hand, the center of gravity CG ROS Distance D from motor axis 112 ROS It is equal to 44.30 mm. It should be understood that the distance D ROS D disclosed in this article ROS It should be understood that without the balancing weight provided by the dust collection assembly 150 and the brake pad bracket 154, the center of gravity CG ROS The distance D ROS Significantly greater than the distance to the center of gravity disclosed above.
[0080] Figures 7 to 13 Details of the dust collection assembly 150 are shown. As shown, the dust collection assembly 150 includes a lower shield 202 (or first shield) and an upper shield 204 (or second shield) attached to the lower shield 202 by one or more fasteners. The upper shield 204 is located above the lower shield 202. The lower shield 202 includes a first lower portion 210 and a second lower portion 212. In certain aspects, the first lower portion 210 is molded around the second lower portion 212. For example, the second lower portion 212 is insert molded with the first lower portion 210. When assembled or otherwise molded, as shown in FIG. Figure 6 As shown, the lower shroud 202 and its components define a lower portion 214 of a dust passage 216 surrounding the dust extraction fan 148 .
[0081] The upper shield 204 includes a first upper shield half 220 and a second upper shield half 222 attached to the first upper shield half 220 along a seam 224. The first upper shield half 220 includes a first upper rear portion 230 and a first upper front portion 232 attached to the first upper rear portion 230. In particular, the first upper front portion 232 is insert molded with the first upper rear portion 230. The first upper front portion 232 includes a plurality of holes 234 to facilitate molding the first upper rear portion 230 to the first upper front portion and ensure a secure bond between the first upper front portion 232 and the first upper rear portion 230.
[0082] The second upper shield half 222 includes a second upper rear portion 240 and a second upper front portion 242 attached to the second upper rear portion 240. In particular, the second upper front portion 242 is insert-molded with the second upper rear portion 240. The second upper front portion 242 includes a plurality of holes 244 to facilitate molding the second upper rear portion 240 to the second upper front portion and ensure a secure connection between the second upper front portion 242 and the second upper rear portion 240. When assembled or otherwise molded, as shown in FIG. Figure 8 As shown, the upper shroud 204 and its components define an upper portion 246 of the dust duct 216 formed by the dust collection assembly 150 around the dust extraction fan 148 .
[0083] In certain embodiments, the dust collection assembly 150 is made of different materials. For example, the dust collection assembly 150 is made of two different materials. In this case, the first lower portion 210, the first upper rear portion 230, and the second upper rear portion 240 are made of a first material. The second lower portion 212, the first upper front portion 232, and the second upper front portion 242 are made of a second material. The first material is a low-density material, and the second material is a high-density material. Specifically, the first material has a first density D1, and the second material has a second density D2. In order to provide an acceptable balance for the random orbital sander 100, the second density D2 of the second material is greater than the first density D1 of the first material. Specifically, the second density D2 is greater than or equal to 5.00 times the first density D1, such as greater than or equal to 5.20 times the first density D1, greater than or equal to 5.40 times the first density D1, greater than or equal to 5.60 times the first density D1, greater than or equal to 5.80 times the first density D1, greater than or equal to 6.00 times the first density D1, or greater than or equal to 6.20 times the first density D1. Further, the second density D2 is less than or equal to 8.00 times the first density D1, such as less than or equal to 7.80 times the first density D1, less than or equal to 7.60 times the first density D1, less than or equal to 7.40 times the first density D1, less than or equal to 7.20 times the first density D1, less than or equal to 7.00 times the first density D1, less than or equal to 6.80 times the first density D1, less than or equal to 6.60 times the first density D1, or less than or equal to 6.40 times the first density D1.
[0084] In another aspect, the first material is an antistatic plastic, such as a filled polymer. Further, the first material is polycaprolactam (also known as nylon 6) filled with carbon fibers. Still further, the first material is nylon 6 filled with 30% carbon fibers. In another aspect, the density D1 of the first material is less than or equal to 1.50 g / cm3, such as less than or equal to 1.45 g / cm3, less than or equal to 1.40 g / cm3, less than or equal to 1.35 g / cm3, less than or equal to 1.30 g / cm3, less than or equal to 1.25 g / cm3, or less than or equal to 1.20 g / cm3. On the other hand, the density D1 of the first material is greater than or equal to 0.75 g / cm3, such as greater than or equal to 0.80 g / cm3, greater than or equal to 0.85 g / cm3, greater than or equal to 0.90 g / cm3, greater than or equal to 0.95 g / cm3, greater than or equal to 1.00 g / cm3, greater than or equal to 1.05 g / cm3, greater than or equal to 1.10 g / cm3, or greater than or equal to 1.15 g / cm3. It should be understood that the density D1 can be within a range between and including any of the maximum and minimum values of the density D1 disclosed herein.
[0085] In yet another aspect, the second material is a metal or a metal alloy. For example, the second material is iron, steel, stainless steel, brass, bronze, nickel, tin, zinc, or a combination thereof. In a particular aspect, the density D2 of the second material is greater than or equal to 5.00 g / cm3, such as greater than or equal to 5.50 g / cm3, greater than or equal to 6.00 g / cm3, greater than or equal to 6.50 g / cm3, greater than or equal to 6.60 g / cm3, greater than or equal to 6.70 g / cm3, greater than or equal to 6.80 g / cm3, greater than or equal to 6.90 g / cm3, greater than or equal to 7.00 g / cm3, or greater than or equal to 7.10 g / cm3. In another aspect, the density D2 of the second material is less than or equal to 10.00 g / cm3, such as less than or equal to 9.50 g / cm3, less than or equal to 9.00 g / cm3, less than or equal to 8.50 g / cm3, less than or equal to 8.00 g / cm3, less than or equal to 7.90 g / cm3, less than or equal to 7.80 g / cm3, less than or equal to 7.70 g / cm3, less than or equal to 7.60 g / cm3, less than or equal to 7.50 g / cm3, less than or equal to 7.40 g / cm3, less than or equal to 7.30 g / cm3, or less than or equal to 7.20 g / cm3. It should be understood that the density D2 can be within a range between and including the minimum and maximum values of the density D2 disclosed herein.
[0086] Accordingly, the lower guard 202 includes a low-density portion (e.g., the first lower portion 210) and a high-density portion (e.g., the second lower portion 212), the low-density portion being located behind the motor axis 112 of the random orbital sander 100 on which the dust collection assembly 150 is installed, i.e., on the first side, and the high-density portion being located in front of the motor axis 112, on the second side opposite to the first side. In addition, the upper guard 204 includes at least one upper low-density portion (e.g., the first upper rear portion 230 and / or the second upper rear portion 240) and at least one upper high-density portion (e.g., the first upper front portion 232 and / or the second upper front portion 242). The at least one upper high-density portion is located in front of the motor axis.
[0087] When Fig.12 and Fig.13 When assembled as shown, the dust collection assembly 150 has higher density components (e.g., the second lower portion 212, the first upper front portion 232, and the second upper front portion 242) in front of or in front of the motor axis 112. The second lower portion 212, the first upper front portion 232, the second upper front portion 242, the second bracket portion 157 of the brake pad bracket 154 (in the Fig.12 and Fig.13 ), or any combination thereof, to provide a weight displacement that will cause the center of gravity CG of the dust collection assembly 150 to DCA The second side is shifted to the front or forward side of the motor axis 112 and aligned with the center of gravity CG of the random orbital sander 100. ROS In contrast, as disclosed above, the center of gravity of the random orbital sander is located on a first side behind the motor axis 112, i.e., on the same side of the motor axis 112 as the handle housing 114 and the battery receptacle 118. The center of gravity CG of the dust collection assembly 150 DCA Located at a distance D from the motor axis 112 DCA In a specific embodiment, the center of gravity CG DCA Distance D from motor axis 112 DCA Less than or equal to 61.50 mm, such as less than or equal to 61.00 mm, less than or equal to 60.00 mm, less than or equal to 59.50 mm, less than or equal to 59.00 mm, or less than or equal to 58.50 mm. In another specific embodiment, the center of gravity CG DCA Distance D from motor axis 112 DCA Greater than or equal to 54.00 mm, such as greater than or equal to 54.25 mm, greater than or equal to 54.50 mm, greater than or equal to 54.75 mm, greater than or equal to 55.00 mm, greater than or equal to 55.25 mm, greater than or equal to 55.50 mm, or greater than or equal to 55.75 mm. On the other hand, the center of gravity CG DCA Distance D from motor axis 112 DCAIt is equal to 55.80 mm. It should be understood that the distance D DCA D disclosed in this article DCA It should also be understood that placing a higher density material in front of the motor axis 112 causes the center of gravity CG of the random orbital sander 100 to be greater than or equal to 0. ROS The shift forward and increases the balance of the random orbital sander 100. This, in turn, enhances the ergonomics of the random orbital sander 100 and makes the user's experience with the random orbital sander 100 more pleasant. The combination of different materials that make up the dust collection assembly 150 also helps dissipate static electricity accumulation of the random orbital sander 100 during its use. Further, by shifting the center of gravity CGROS of the random orbital sander 100 forward toward the motor axis 112, a relatively large removable battery pack can be used with the random orbital sander 100, such as the battery pack described herein having an energy density of approximately 395 kJ / kg.
[0088] refer to Fig.13 The dust collection assembly 150 further includes an edge protection slot 250 formed partially around the outer periphery of the first lower portion 210 of the lower shield 202. The edge protection slot 250 includes an opening 252 formed therein at each end 254 of the edge protection slot 250. Fig.14 The edge guard 160 is shown to include a first tab 260 and a second tab 262 formed at each end 264, 266 of the edge guard 160 and extending inwardly from an inner lip 268 of the edge guard 160. Fig.15 As shown, the inner lip 268 of the edge guard 160 fits into the edge guard slot 250 on the dust collection assembly 150, and the edge guard 160 can be slid into the edge guard slot 250 until the tabs 260, 262 on the edge guard 160 engage with the openings 252 formed at each end 254 of the edge guard slot 250. The rigidity of the edge guard 160 acts as a spring to maintain the tabs 260, 262 in the openings 252. The edge guard 160 at least partially surrounds the backing pad 142 when fully engaged with the dust collection assembly 150 to prevent the backing pad 142 from colliding with objects extending upward from the workpiece (e.g., the side walls of the cabinet interior). The edge guard 160 can be removed from the dust collection assembly 150.
[0089] Figures 16 to 22Details of another dust collection assembly 300 are shown that is configured to be installed in a random orbital sander 100 in place of the dust collection assembly 150 described above. As shown, the dust collection assembly 300 includes a lower guard 302 and an upper guard 304 attached to the lower guard 302 by one or more fasteners. The lower guard 302 is a single, unitary piece. In other words, the lower guard 302 is integrally formed or molded as a single piece. When molded as a single, unitary piece, such as Fig.17 As shown, when the dust collection assembly 300 is installed in the random orbital sander 100 , the lower shroud 302 defines a lower portion 310 of a dust passage 312 surrounding the dust extraction fan 148 .
[0090] The upper shield 304 includes a first upper shield half 320 and a second upper shield half 322 attached to the first upper shield half 320 by one or more fasteners. Fig.18 As shown, when the dust collection assembly 300 is installed in the random orbital sander 100, the upper shroud 304 (ie, the shroud halves 320, 322 thereof) defines an upper portion 324 of the dust passage 312 formed by the dust collection assembly around the dust extraction fan 148.
[0091] In certain embodiments, the dust collection assembly 300 is made of different materials. For example, the lower guard 302 and the first upper guard half 320 are made of a first (low density) material, and the second upper guard half 322 is made of a second (high density) material. In particular, these materials are the same as those discussed above in connection with the dust collection assembly 150. In any case, the second upper guard half 322 is heavier than the first upper guard half 320 and acts as a static counterbalance within the random orbital sander 100.
[0092] When Fig. 20 and Fig.21 When the dust collection assembly 300 is assembled as shown, the dust collection assembly 300 has a high-density component in front of the motor axis 112, namely the second upper shield half 322 and the second bracket portion 157. The weight displacement provided by the second upper shield half 322 and the second bracket portion 157 makes the center of gravity CG of the dust collection assembly 300 DCA Displaced in front of or in front of the motor axis 112 and the center of gravity CG of the random orbital sander 100 ROS In contrast, as disclosed above, the center of gravity of the random orbital sander is located behind the motor axis 112, i.e., on the same side of the motor axis 112 as the handle housing 114. Without the counterweight provided by the dust collection assembly 300 and the brake pad bracket 154, the counterweight provided by the dust collection assembly 300, the brake pad bracket 154, or a combination thereof, causes the center of gravity CG of the random orbital sander 100 to be approximately 1.175 mm / s. ROS Displaced forwardly toward the motor axis 112 from a position farther from the motor axis 112 .
[0093] By placing the center of gravity CG of the random orbital sander 100 ROS Shifting forward toward the motor axis 112 , a relatively larger removable battery pack may be used with the random orbital sander 100 , such as the battery pack described herein having an energy density of approximately 395 kJ / kg.
[0094] refer to Fig. 22 and Fig.24 , the dust collection assembly 300 further includes an edge protection slot 330 formed partially around the outer periphery of the lower shield 302. The edge protection slot 330 includes a center locking post 332. A first slot portion 334 extends away from the center locking post 332 in a first direction, and a second slot portion 336 extends away from the center locking post 332 in a second direction. The first slot portion 334 terminates in a first opening 338 formed at a distal end 340 of the first slot portion 334. The second slot portion 336 terminates in a second opening 342 at a distal end 344 of the second slot portion 336.
[0095] Fig.23 Another embodiment of an edge guard 350 is shown that can be used with the random orbital sander 100 in place of the edge guard 160 described above. As shown, the edge guard 350 includes a first tab 360 and a second tab 362 formed at each end 364, 366 of the edge guard 160 and extending inwardly from an inner lip 368 of the edge guard 160. Further, the edge guard 350 includes a center clip 370 that is sized and shaped to fit over and engage with a center locking post 332 on the lower guard 302 of the dust collection assembly 300 within the edge guard slot 330.
[0096] like Fig.25As shown, the inner lip 368 of the edge guard 350 fits into the edge guard slot 330 on the dust collection assembly 300 (i.e., fits into the first slot portion 334 and the second slot portion 336 of the edge guard slot 330). The edge guard 350 can be slid into the edge guard slot 330 until the first tab 360 engages with the first opening 338 formed at the distal end 340 of the first slot portion 334 of the edge guard slot 330 and the second tab 362 engages with the second opening 342 formed at the distal end 344 of the second slot portion 336 of the edge guard slot 330. In addition, when the edge guard 350 is installed in the edge guard slot 330, the center clip 370 of the edge guard 350 snaps onto the complementary shaped center locking post 332 located between the first slot portion 334 and the second slot portion 336. The interaction of the first tab 360 with the first opening 338, the interaction of the second tab 362 with the second opening 342, and the interaction of the center clip 370 with the center locking post 332 maintain the edge guard 350 in a configuration engaged with the dust collection assembly 300. The edge guard 350 at least partially surrounds the backing pad 142 when fully engaged with the dust collection assembly 300 to prevent the backing pad 142 from colliding with objects extending upward from the workpiece (e.g., a side wall inside the cabinet). The edge guard 350 can be removed from the dust collection assembly 300.
[0097] Although the disclosure has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the scope and spirit of one or more independent aspects of the disclosure described.
Claims
1. An orbital sander, characterized in that: include: case; a motor within the housing, the motor including a motor shaft defining a motor axis; an eccentric drive unit coupled to the motor shaft and configured to convert rotation of the motor shaft into orbital motion about the motor axis; a battery receptacle configured to receive a battery pack to provide current to the motor; a backing pad coupled to the eccentric drive unit for orbital motion about the motor axis; as well as a dust collection assembly adjacent to the backing pad and configured to direct dust away from the backing pad; The orbital sander including the housing, the motor, the eccentric drive unit, the battery receptacle, the backing pad and the dust collection assembly defines a center of gravity CG located on a first side of the motor axis adjacent to the battery receptacle. ROS , and wherein the dust collection assembly defines a center of gravity CG located on a second side of the motor axis opposite to the first side DCA .
2. The orbital sander according to claim 1, characterized in that The dust collection assembly includes a first material having a first density and a second material having a second density, wherein the second density is greater than the first density, and wherein the second material is located forward of the motor axis.
3. The orbital sander according to claim 1, characterized in that The dust collection assembly includes a lower shield and an upper shield coupled to the lower shield.
4. The orbital sander according to claim 3, characterized in that The lower shield includes a first lower portion and a second lower portion attached to the first lower portion.
5. The orbital sander according to claim 4, characterized in that The upper shield includes a first upper shield half having a first upper rear portion and a first upper front portion coupled to the first upper rear portion.
6. The orbital sander of claim 5, wherein: The upper shield includes a second upper shield half having a second upper front portion and a second upper rear portion coupled to the second upper front portion.
7. The orbital sander of claim 6, wherein: The first lower portion of the lower shield, the first upper rear portion of the upper shield, and the second upper rear portion of the upper shield include a first material.
8. The orbital sander of claim 7, wherein: The second lower portion of the lower shield, the first upper front portion of the upper shield, and the second upper front portion of the upper shield include a second material.
9. The orbital sander of claim 8, wherein: The first material has a first density and the second material has a second density, and wherein the second density is greater than the first density.
10. The orbital sander of claim 9, wherein: The second density is greater than or equal to five times the first density.
11. The orbital sander of claim 8, wherein: The first material is a polymer.
12. The orbital sander of claim 11, wherein: The second material is metal.
13. The orbital sander of claim 1, wherein: The dust collecting assembly is formed integrally with the housing.
14. The orbital sander of claim 1, wherein: The dust collecting assembly is formed separately from the shell.
15. The orbital sander of claim 1, wherein: Further included is a brake pad holder and a brake pad adjacent to the first side of the backing pad.
16. The orbital sander of claim 15, wherein: The dust collection assembly at least partially surrounds the brake pad holder and the brake pad.
17. The orbital sander of claim 15, wherein: The brake pad bracket includes a first bracket portion located on a first side of the motor shaft and a second bracket portion located on a second side of the motor shaft, and the second bracket portion is heavier than the first bracket portion.
18. The orbital sander of claim 1, wherein: The dust collection assembly includes a first shield and a second shield, wherein the second shield includes a first portion located on a first side of the motor shaft and a second portion located on a second side of the motor shaft, and wherein the second portion is heavier than the first portion.
19. An orbital sander, characterized in that: include: case; a motor within the housing, the motor including a motor shaft defining a motor axis; an eccentric drive unit coupled to the motor shaft and configured to convert rotation of the motor shaft into orbital motion about the motor axis; A battery receptacle, the battery receptacle being used to receive a battery pack to provide current to the motor; a backing pad coupled to the eccentric drive unit for orbital motion about the motor axis; as well as a brake pad holder and a brake pad, the brake pad holder and the brake pad being adjacent to a first side of the backing pad; The orbital sander including the housing, the motor, the eccentric drive unit, the battery receptacle and the backing pad defines a center of gravity CG located on a first side of the motor axis adjacent to the battery receptacle. ROS , and wherein the brake pad support defines a center of gravity CG located on a second side of the motor axis opposite to the first side DCA .
20. The orbital sander of claim 19, wherein: Further included is a dust collection assembly adjacent to the backing pad and configured to direct dust away from the backing pad, wherein the dust collection assembly includes a first material having a first density and a second material having a second density, wherein the second density is greater than the first density, and wherein the second material is located on a second side of the motor axis.
21. An orbital sander, characterized in that: include: case; a motor within the housing, the motor including a motor shaft defining a motor axis; an eccentric drive unit coupled to the motor shaft and configured to convert rotation of the motor shaft into orbital motion about the motor axis; A battery receptacle, the battery receptacle being used to receive a battery pack to provide current to the motor; a backing pad coupled to the eccentric drive unit for orbital motion about the motor axis; as well as A static balancing member is located in the housing, in front of the motor axis, and opposite to the battery receptacle.
22. The orbital sander of claim 21, wherein: The static balance includes a portion of the brake pad holder within the housing adjacent the backing pad.
23. The orbital sander of claim 22, wherein: The static balance further includes a portion of a dust collection assembly at least partially surrounding the brake pad holder.
24. The orbital sander of claim 22, wherein: The brake pad bracket includes a first bracket portion located on a first side of the motor shaft.
25. The orbital sander of claim 24, wherein: The brake pad support includes a second support portion located on a second side of the motor shaft.
26. The orbital sander of claim 25, wherein: The second bracket portion is heavier than the first bracket portion.
27. The orbital sander of claim 23, wherein: The dust collection assembly includes a first shield and a second shield, and wherein the second shield includes a first portion located on a first side of the motor shaft.
28. The orbital sander of claim 27, wherein: The second shield further includes a second portion located on a second side of the motor shaft.
29. The orbital sander of claim 28, wherein: The second portion is heavier than the first portion.
30. The orbital sander of claim 21, wherein: The static balancing member is made of a material with a density greater than or equal to 5 g / cm3.