Tool holders and tool set supports for power trowels

Abstract

A power trowel (100, 1200) includes one or more rotatable tool set carriers (110) arranged to support tool holders (130) for treating a surface (101). The power trowel (100, 1200) includes a protective cover (120) configured to at least partially surround the one or more rotatable tool set carriers (110), wherein at least one access section (140) configured to connect with the protective cover (120) is arranged to move between a first position and a second position, in which the tool set carrier (110) is... In the second position, the tool carrier (110) is uncovered to allow access to at least one tool holder (130) from outside the protective cover (120), wherein at least one tool carrier (110) includes a central hub (310) arranged to be attached to a drive shaft, wherein the tool carrier (110) is arranged to rotate in the drive direction (R1) about a central axis of rotation (A1) in response to rotation of the drive shaft, wherein the tool carrier (110) is arranged to allow at least a portion of the tool carrier (110) to be manually rotated one revolution relative to the drive shaft about the central axis of rotation (A1). The invention also includes a tool carrier for a power trowel and a method for inspecting, repairing, replacing, and / or altering tools on a power trowel.

Description

Technical Field

[0001] This disclosure relates to surface treatment equipment for treating hard surfaces such as concrete and stone surfaces, and more particularly to a trowel-type grinder that can be used for both troweling and grinding and / or polishing concrete surfaces. Background Technology

[0002] Traditionally, a trowel (sometimes called a trowel) is a machine used on semi-finished concrete after pouring to create a uniform surface. However, if a grinding tool is used instead of a trowel, a trowel can also be used on more mature concrete surfaces to achieve the desired roughness. A trowel capable of both troweling and grinding is sometimes called a trowel-grinding machine.

[0003] A power trowel includes one or more sets of rotatable tool holders for holding the power trowel or abrasive tools. Larger machines with two or more sets of rotatable tool holders are typically ride-on, with the operator seated on top of the power trowel, while smaller power trowels with a single set of rotatable tool holders are typically manually guided by an operator walking around the power trowel. The interconnected set of tool holders is carried on a tool set carrier.

[0004] Autonomous concrete surface treatment machines and remotely controlled concrete surface treatment machines are also known, in which there is no drive directly connected to the machine.

[0005] Power trowels typically include any number of sets of rotatable tool holders, with one or two sets being the most common.

[0006] We are looking for improved trowel-type grinders and other surface treatment tools. Summary of the Invention

[0007] The purpose of this disclosure is to provide improved surface treatment tools.

[0008] This objective is achieved at least in part by a power trowel comprising one or more rotatable tool set carriers arranged to support respective tool holders for treating surfaces such as concrete or stone. The power trowel includes a protective cover or cage structure configured to at least partially enclose, and preferably the entire tool set carrier, from above. At least one access section is configured to connect to the protective cover. The access section is arranged to move between a first position, in which the tool set carrier is covered, and a second position, in which the tool set carrier is uncovered, to allow access to at least one tool holder from outside the protective cover. The access section provides the operator with a convenient way to access the tools of the power trowel. This design is advantageously combined with a manually rotatable tool set carrier that can be rotated by the operator in at least one direction to expose any given tool holder on the tool set carrier via an opening in the access section. The access section simplifies the maintenance and inspection of the tools of the power trowel.

[0009] According to some aspects, a skirt is provided between the protective cover and the surface, the skirt surrounding the edge of the protective cover. This skirt advantageously prevents foreign objects from entering the protective cover from below. The skirt is preferably arranged to float relative to the protective cover in use and is supported by the surface. This maintains sufficient contact between the skirt and the surface to ensure the skirt performs its intended function. The skirt can also, to some extent, conform to unevenness in the surface, which is advantageous. In some embodiments, the vertical position of the skirt relative to the surface in use can be adjustable. This allows the operator to adjust the position of the skirt relative to the surface. In some cases, for example, some slack may be desired between the surface and the skirt. A portion of the skirt may be integrally formed with or at least attached to the access section, such that a portion of the skirt moves with the access section between a first position and a second position. Thus, when the access section is in the second position, the skirt will not obstruct access to the tool holder from outside the protective cover.

[0010] According to some aspects, each access section of the protective cover is arranged to expose a portion of the corresponding tool set carrier when in the second position. As mentioned above, the tool set carrier can be arranged such that it can be manually rotated by the operator to expose all tools on the tool set carrier. The uncovered portion of the corresponding tool set carrier may, for example, correspond to at least one-third of the perimeter of the tool set carrier. In this way, it is advantageous to keep the size of the access section within reasonable limits.

[0011] At least one access section of the protective cover is hingedly connected to the power trowel about at least one pivot point, allowing the access section to pivot from a first position to a second position. This is convenient because the access section remains attached to the power trowel. If the movement from the first position to the second position is less than a predetermined angle, the at least one hinged access section can also be biased toward the first position by a spring-loaded hinge mechanism. This keeps the access section closed to prevent accidental opening. If the movement from the first position to the second position exceeds a predetermined angle, the at least one hinged access section can also be offset toward the second position by a spring-loaded hinge mechanism. Thus, the access section remains in the second position when the operator approaches the tool and performs the work task. It is also advantageous that the access section moves more easily from the first position to the second position because the spring-loaded hinge mechanism provides assisting rotational force.

[0012] As an alternative to or supplement to using an articulated access section, at least one access section of the protective cover may be arranged to be disconnected from the rest of the protective cover and removed from the power trowel. In this case, the operator can remove the access section from the power trowel to access the tool.

[0013] This disclosure also relates to a tool set carrier for a power trowel. The tool set carrier is arranged to support one or more tool holders. The tool set carrier includes a central hub arranged to be attached to a drive shaft, and the tool set carrier is arranged to rotate in the drive direction about a central axis of rotation in response to rotation of the drive shaft. The tool set carrier is arranged to allow at least a portion of a full rotation about the central axis of rotation relative to the drive shaft. Thus, an operator can access different tools held by the tool set carrier by manually rotating it. The manually rotatable tool set carrier can be used with a protective cover that allows access to a subset of the tool holders. Thus, the operator can manually rotate the tool set carrier to access all tool holders. According to some aspects, the tool set carrier is arranged to allow manual rotation in the drive direction. According to some other aspects, the tool set carrier is arranged to allow manual rotation in the drive direction and in directions opposite to the drive direction (i.e., clockwise and counterclockwise). This simplifies access to the tools supported on the tool set carrier.

[0014] According to some aspects, the central hub of the tool set carrier includes a first portion arranged rotatably fixed to a drive shaft and a second portion connected to a tool holder. The second portion is supported on the first portion to allow relative rotation between the second and first portions about a central axis of rotation. Together, the first and second portions implement a rotation limiting mechanism that prevents relative rotation between the first and second portions from exceeding an angular range and / or prevents rotation of the tool set carrier relative to the drive shaft in the opposite direction of drive. This allows the operator advantageously to access all tools supported on the tool set carrier by manually rotating it.

[0015] The rotation stop mechanism optionally includes cooperating and radially overlapping heels arranged between the first and second portions to prevent relative rotation between the inner and outer portions beyond an angular range. This allows the operator to rotate the portions to access the tool, and the drive shaft can engage at any time to drive to the tool set carrier without any additional locking mechanisms. The heels provide robust rotational locking when the tool set carrier is driven by the drive shaft.

[0016] The rotation stop mechanism may also include a ratchet mechanism configured to prevent the tool set carrier from rotating relative to the drive shaft in a direction opposite to the drive direction. The ratchet mechanism may, for example, include cooperating ratchet rings attached to the first and second parts respectively. Alternatively or additionally, the ratchet mechanism may include a ratchet connected to one of the first and second parts and one or more spring-loaded pawls connected to the other. These types of ratchet mechanisms have been found to work well for this type of tool holder used in concrete and stone surface finishing machines. The ratchet mechanism allows the tool set carrier to rotate unrestricted in the drive direction; that is, the operator can rotate the tool set carrier several revolutions. This can be advantageous if the operator is performing tests or inspections, as the tool set carrier is seen rotating freely under the trowel's protective cover.

[0017] This document also discloses a method for inspecting, repairing, replacing, and / or altering tools on a power trowel, the power trowel including one or more rotatable tool set carriers arranged to support respective sets of tool holders for surface treatment. The method includes moving an access section into its second position, accessing at least one tool holder from outside a protective cover, and inspecting, repairing, replacing, and / or altering the tools supported by the tool holders.

[0018] The components disclosed herein also relate to a tool holder for a power trowel, the tool holder comprising a central hub arranged to be attached to a tool set carrier and a rotating portion comprising a tool holder plate and a universal joint, wherein the rotating portion is arranged to rotate relative to the central hub about a tool holder rotation axis. The universal joint pivotally connects the central hub to the tool holder plate, allowing the tool holder plate to pivot relative to the central hub about at least a first universal pivot axis. The central hub is fixed to a bearing supported on the rotating portion to allow relative rotation between the central hub and the rotating portion about the tool holder rotation axis, wherein the bearing is at least partially surrounded by the rotating portion.

[0019] The build-up height is important in tool holders used in power trowels. The tool holders disclosed herein have a relatively small build-up height, which is partly due to the bearings embedded in the rotating portion of the tool holder. Build-up height is generally referred to as the height of the tool holder measured from the bottom of the tool holder plate along its main axis of rotation.

[0020] The universal joint is preferably configured to allow pivoting about a first universal axis and a second universal axis extending laterally or even vertically relative to the first universal pivot axis, although a single pivot axis is sufficient.

[0021] The tool holder discussed in this article includes a universal joint that is divided into two axially aligned portions. A second universal joint can then pass laterally between these two axially aligned portions, thereby further reducing the build height of the tool holder.

[0022] To further reduce the build height of the tool holder, a cutout or recess can be formed in the upper side of the tool holder plate to allow the components of the universal joint to pass through when the tool holder plate pivots relative to the center hub.

[0023] This disclosure also relates to a tool holder for a power trowel, the tool holder comprising a central hub and a tool holder plate, wherein the central hub is arranged to attach to the tool assembly carrier of the power trowel. A universal joint pivotally connects the central hub to the tool holder plate, allowing the tool holder plate to pivot relative to the central hub about a first universal pivot axis and a second universal pivot axis. The central hub includes a sealed bearing supported on the universal joint to allow relative rotation between the central hub and the tool holder plate about the tool holder's rotation axis. The sealed bearing can be embedded in the top plate of the tool holder (thereby protecting the sealed bearing and not significantly increasing the build height of the tool holder), reducing the need for maintenance of the tool holder and generally providing a robust design suitable for concrete surface finishing.

[0024] The labyrinthine structure can be configured to connect with the bearing to prevent dust and slurry from entering. This labyrinthine structure provides additional protection for the bearing. Together with the bearing embedded in the top plate of the tool holder, this achieves a robust design suitable for very demanding concrete surface treatment operations involving large amounts of dust and slurry. If a sealed bearing is used, it also reduces the need for maintenance of the tool holder, which is advantageous.

[0025] Depending on the aspect, a resilient seal or gasket (such as a V-ring seal or a radial shaft seal) is connected around the central hub journal and positioned between the central hub and the rotating portion of the tool retainer. The resilient seal can be arranged in conjunction with a labyrinthine structure to improve protection against dust and slurry, or it can be used in place of the labyrinthine structure. The seal provides additional protection against dust and slurry entering the tool retainer, which could otherwise cause problems.

[0026] This document also discloses a tool holder for a power trowel. The tool holder extends in a tool holder plane and is arranged to rotate in a drive direction about a central axis of rotation in response to rotation of a drive shaft. The tool holder is arranged to rotatably support one or more tool holders at corresponding radial distances from the central axis of rotation, wherein each tool holder is arranged to rotate about a corresponding tool holder axis of rotation. The tool holder includes one or more biasing elements arranged to apply force on the corresponding tool holder in a direction transverse to the tool holder plane at a position offset from the tool holder axis of rotation. In use, the biasing elements promote passive rotation about the tool holder axis via the tool holder, i.e., when the tool holder supporting the tool holder rotates. Induced rotation is passive rotation obtained without any dedicated active drive mechanism, which is advantageous. That is, induced rotation about the tool holder axis of rotation is generated by rotation of the tool holder. At least one biasing element preferably comprises a spring-loaded wheel whose rolling direction is arranged perpendicular to the radial direction of the tool holder. This is a cost-effective and robust way to facilitate rotation around the tool holder axis. At least one biasing element can be attached to the arm of the tool set carrier, such as between the central axis of rotation of the tool set carrier and the axis of rotation of the tool holder.

[0027] Generally, unless otherwise expressly defined herein, all terms used in the claims will be interpreted according to their ordinary meaning in the art. All references to “a / an / the element, device, component, apparatus, step, etc.” will be interpreted openly as referring to at least one example of the element, device, component, apparatus, step, etc., unless otherwise expressly stated. Unless expressly stated otherwise, the steps of any method disclosed herein need not be performed in the exact order disclosed. Further features and advantages of the invention will become apparent when examined in conjunction with the appended claims and the following description. Those skilled in the art will recognize that different features of the invention can be combined to produce embodiments other than those described below without departing from the scope of the invention. Attached Figure Description

[0028] This disclosure will now be described in more detail with reference to the accompanying drawings, in which: Figures 1A to 1C An exemplary ride-on power trowel is shown; Figures 2A to 2B An exemplary spring mechanism is shown; Figure 3 , Figures 4A to 4B , Figures 5A to 5B as well as Figure 6 An exemplary tool set carrier is shown; Figures 7 to 9 An exemplary tool holder is shown; Figures 10 to 11 An exemplary tool set carrier with biasing elements is shown; Figures 12A to 12B An exemplary armrest power trowel is shown; Figure 13 This is a flowchart illustrating the method; Figure 14 An exemplary ride-on power trowel is shown; and Figure 15 An exemplary tool set carrier is shown; Detailed Implementation

[0029] The invention will now be described more fully below with reference to the accompanying drawings, in which certain aspects of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as being limited to the embodiments and aspects set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Throughout the description, the same reference numerals denote the same elements.

[0030] It should be understood that the present invention is not limited to the embodiments described herein and shown in the accompanying drawings; rather, those skilled in the art will recognize that many changes and modifications can be made within the scope of the appended claims.

[0031] Figures 1A to 1C An exemplary ride-on power trowel 100 is illustrated. However, the techniques and embodiments described herein are not limited to any particular form of power trowel. Rather, the teachings herein are applicable to most power trowel designs, including single-trowel and multi-trowel machines, manually and autonomously guided machines, and armrest and ride-on machines. Figures 12A to 12B An exemplary armrest-type power trowel is shown. For example, the machine may be battery-powered, gasoline-powered, or propane-powered. Figures 12A to 12B An exemplary manual-guided power trowel 1200 is shown in which at least some of the teachings herein may be advantageously applied.

[0032] Figures 1A to 1C An exemplary power trowel 100 includes an operator's seat 150 and controls in the form of a foot pedal 170 and two joysticks 160. An operator seated in the seat 150 can use the control function to control various operations of the ride-on power trowel 100. The power trowel 100 includes two tool carriers 110 arranged side-by-side, which give the machine 100 an elongated coverage area on a surface 101, as seen from a top view T of the machine 100.

[0033] Each tool set carrier 110 rotatably supports multiple tool holders 130 on an arm extending radially outward from the center of the tool set carrier. Note that the arm is not strictly necessary. The tool holders may also be supported on a large disc or similar object. Figure 3 An exemplary tool carrier 110 is shown, having arms 320 extending radially outward from a central hub 310. Each arm 320 has an attachment point 330 for a tool holder at its distal end, such as... Figure 3 exemplified in .

[0034] Depending on the task to be performed, the tool holder 130 supports the corresponding troweling or grinding tool, which engages with the concrete or stone surface to be treated. Therefore, it should be understood that the term "troweling" is used broadly herein and includes machines capable of troweling, grinding, and / or polishing concrete surfaces. The troweling machine discussed herein may also be referred to as concrete surface treatment equipment or concrete surface treatment machine. Some troweling machines do not even hold the troweling tool, but only the grinding tool, such as a rigid abrasive tool or a soft pad containing polishing compounds or abrasive particles.

[0035] Each tool holder 130 on the tool set carrier 110 can be fitted with a trowel to smooth a nearly finished concrete surface, or with a grinding tool to grind or polish the concrete surface by abrasive action. Grinding tools may include rigid abrasive sections or soft pads with or without some form of polishing compound or abrasive particles. The grit level of the grinding tool determines the final roughness of the concrete surface. Increased grit size means smaller particles, with approximately 800 or larger producing a glossy finish. Soft polishing tools, such as pads with polishing paste, are also conceivable.

[0036] Tool holders 130 are arranged in groups on one or more tool set carriers 110, which will be combined with, for example, tools in combination with ... Figure 3 Examples and discussions will be provided. Each tool set carrier rotates about its respective central axis of rotation due to the driving torque provided by the drive shaft. The tool holder 130 can also rotate about its respective tool holder axis during operation, wherein the rotation of the tool holder about its tool holder axis is generally a passive rotation caused by the rotation of the tool set carrier about the central axis of rotation of the tool set carrier. Therefore, two types of rotation are generally involved in the treatment of concrete surfaces. One is an active primary rotation about the center of the tool set carrier and the other is a passive local rotation about the rotation center of the tool holder. The following will combine... Figure 3 These different axes of rotation will be discussed in more detail. The central axis of rotation of the tool set carrier on the power trowel is typically pivotable, which allows the power trowel to be manipulated on the concrete surface 101. By tilting the tool set carrier, steering and forward movement can be produced in known ways.

[0037] The protective cover 120 is arranged to surround the rotatable tool carrier 110 to protect the tool carrier from external foreign objects at the work site and also to protect personnel from the rotating tools on one or more tool carriers. Figures 1A to 1C and Figures 12A to 12B As shown, the protective cover 120 can be formed as a cage structure made of metal rods or pipes. A sheet of plastic or metal can also be formed as part of the protective cover 120. It is advantageous that the protective cover 120 preferably extends over the entire coverage area of ​​the rotatable tool of the power trowel, at least when viewed from above. Therefore, when as... Figure 1C As shown when viewed from the top T, the protective cover covers the entire sweeping area of ​​the machine's rotating tool.

[0038] In some cases, the protective cover 120 defines a closed or sealed volume including the tool retainer. For example... Figures 1A to 1CAs illustrated in the example, the enclosed volume can be sealed relative to the surface by a floating skirt 125. The advantage of using an enclosed volume is that dust generated during surface treatment operations can be captured within the volume and extracted from it in a controlled manner using a dust collector.

[0039] The ride-on power trowel 100 is a relatively heavy piece of equipment, making it difficult to lift off the ground, for example, by tilting it relative to the ground. Therefore, it is difficult to access the tool holder underneath the machine 100. To simplify access to the tool holder, for example, to allow new sets of grinding tools to be installed, or to allow for more efficient inspection of the tool holder and tool set carrier, Figures 1A to 1C and Figure 12 to Figure 12B The power trowel includes one or more access sections 140 movable from a first position to a second position. In the first position, the access section covers tools, and in the second position, it allows convenient access to at least some of the tools. Figure 1A An example with two proximity sections is shown, wherein the two proximity sections are in their respective first positions, i.e., the positions used during operation of the power trowel 100. Figure 1B Two access sections 140 are shown in their respective second positions, allowing access to the tool holder. The technique of using access sections in the protective cover of the power trowel can also be used with other types of power trowels, such as those with… Figures 12A to 12B The machine 1200 shown is used together.

[0040] exist Figures 1A to 1C In the example, the approach section is formed in a manner similar to a visor on a helmet, where the pivotable section of the skirt is the visor, and the protective shield is the helmet that remains in place when the approach section opens to expose a portion of the tool set carrier. The approach section 140 pivots from a first position to a second position on the outside of the protective shield, similar to a visor protecting the face on a helmet. According to some aspects taught herein, one or more approach sections 140 are separated from the protective structure 120, meaning that the protective structure remains in place as the approach section moves from the first position to the second position. This is advantageous because protection of the protective shield 120 is maintained regardless of the position of the approach section 140. This also means that the protective shield does not require any hinges and can be rigidly constructed as a structure, allowing for a more stable protective shield.

[0041] In summary, this document discloses power trowels 100 and 1200, which include one or more rotatable tool set carriers 110 arranged to support sets of tool holders 130 for working surfaces 101 (such as concrete or stone surfaces). Power trowels 100 and 1200 include a protective cover 120 configured to at least partially surround one or more rotatable tool set carriers 110, and preferably cover the entire rotatable tool set carrier. The protective cover may be as follows: Figures 1A to 1C and Figures 12A to 12B The cage structure shown, or some other cover structure, such as a cover made of metal plate, plastic shell, etc., may also be used. A combination of steel bars and plates may also be used. At least one access section 140 is arranged to be connected to the protective cover 120, and preferably formed separately from the protective cover. The access section is arranged to move between a first position and a second position, in which the tool set carrier 110 is covered (i.e., protected from the surrounding environment), and in the second position, the tool set carrier 110 is at least partially uncovered to allow access to at least one of the tool holders 130 from outside the protective cover 120.

[0042] The operator or service technician can operate the access section to reach the tools beneath the power trowel, which is advantageous because it greatly simplifies access to the tools under the machine. Figures 1A to 1C In the example, the tool holder is allowed to be approached from a horizontal direction parallel to surface 101 rather than from above. This is advantageous because the tool holder is protected from, for example, falling objects, even when the approach section is in its second position.

[0043] The access section of the protective cover 120 is advantageously combined with a special type of tool carrier 110, which is arranged to allow manual rotation of the tool carrier 110 relative to the drive shaft for at least a portion of rotation about the central axis of rotation of the tool carrier. This type of tool carrier will be discussed below, and some examples of how it can be implemented in practice will be given. The operator can move the access section 140 to a second position (such as...) using the techniques disclosed herein. Figure 1B and Figure 1C (as shown in the diagram), and then approach all the tool holders on the tool set carrier by manually rotating the tool set carrier to expose the tool holders one by one. However, it should be noted that the tool holders are still covered by the protective cover 120.

[0044] Each approach section 140 of the protective cover 120 is arranged to expose at least a portion of the corresponding tool set carrier 110 when in the second position. The uncovered portion of the corresponding tool set carrier 110 corresponds to at least one-third of the perimeter of the tool set carrier 110.

[0045] The skirt 125 is preferably disposed around the edge of the protective cover 120 between the protective cover 120 and the surface 101, such as Figures 1A to 1CAs illustrated in the example. This skirt reduces the amount of dust and slurry sprayed into the surrounding environment during surface treatment, which is advantageous. The skirt also prevents external foreign objects from entering below the power trowel, which could cause damage to tools or tool holders. The skirt 125 can be arranged to float relative to the protective cover 120 and is supported by the surface 101 in use. To be arranged to float means that the skirt is only loosely connected to the rest of the power trowel, in… Figures 1A to 1C In the example, vertical displacement relative to the power trowel chassis is allowed. Figures 1A to 1C The vertical displacement is achieved by a matching vertical extension groove 180 and a slider 185 that moves up and down within the groove 180.

[0046] As an alternative to a freely floating skirt, the vertical position or height of the skirt 125 relative to the surface 101 during use can be adjustable. This allows the operator to position the skirt 125 above the surface to be treated. The operator can then adjust the gap between the surface 101 and the lower edge of the skirt to a preferred size. In this case, the slider 185 can be configured as an eccentric lock or other friction-generating device.

[0047] In this and other examples, the skirt is formed by multiple segments, that is, it is not a continuous piece that bends around the protective cover 120. Figures 1A to 1C The example has a skirt formed by four segments. Two segments are arranged on or at least connected to the corresponding proximity segment 140, while the other two segments are arranged on the side between the proximity segments 140.

[0048] exist Figures 1A to 1C In the example, the approach section 140 is hinged to the power trowel chassis around axis P, as shown. Figure 1C As shown, access sections are designed to simplify operation. Typically, at least one access section 140 of the protective cover 120 is hinged to the polishing machine 100 around at least one pivot point 145, 1200 to allow pivoting from a first position to a second position via the access section 140. Figure 1C The pivot axis P intersects with two pivot points 145. However, it should be noted that only pivot points are necessary, and there may be two or more points around which the pivot points of the adjacent sections are located on the polishing machine.

[0049] To simplify movement of the approach segment 140 between the first and second positions, if the movement from the first position to the second position is less than a predetermined angle, at least one hinged approach segment 140 can be biased toward the first position by the spring-loaded hinge device 200; and if the movement from the first position to the second position is greater than the predetermined angle, at least one hinged approach segment 140 can also be biased toward the second position by the spring-loaded hinge device 200. The predetermined angle is the equilibrium point of the spring-loaded hinge device. Figures 2A to 2B An exemplary spring-loaded hinge device 200 with this function is shown. Figure 2A The access section 140 is shown in a first position, in which the tool holder is covered, i.e., inaccessible from the outside of the protective cover 120. The access section is hinged around a pivot point 145. In this example, the spring device 200 includes a spring 210 and a pivotable element 230 connected at a bracket 220 to the power finisher 100. The access section may be attached to the pivotable element 230 at a bolt hole 240. Figure 2A In the middle, the spring force from spring 210 forces the pivotable element to rotate counterclockwise, so that the approach section 140 is held in the first position. When the approach section 140 is in the clockwise direction (in Figures 2A to 2B As it pivots around pivot point 145 (in the view), it passes through the equilibrium point, similar to an eccentric device, and is thus biased in a clockwise direction. When this happens, the access section 140 then becomes biased toward the second position, where the access section 140 is held, allowing an operator or service technician to access one or more tool holders 130 and a portion of the tool set carrier 110. Figure 2B This state of the spring arrangement 200 is shown.

[0050] Gas springs or similar devices can be used to replace traditional springs 210.

[0051] Sensor devices 250 and 255 can be arranged to connect to one or more proximity sections to detect the position of the proximity section, i.e., whether the proximity section is open to allow the approaching tool or closed to prevent approach. Figure 2B In this context, the Hall effect sensor 250 and the like can be configured to detect whether a magnet or metal object 255 is near the sensor, in order to detect which position the proximity segment is in, either a first position or a second position.

[0052] According to some aspects, when one or more access sections are in their respective second positions—that is, if one or more access sections have been opened to allow access to the tools below the power trowel—the control unit of the power trowel can be configured to prevent operation. This improves operator safety because the machine cannot be started during maintenance when the operator or maintenance technician may be near the tools below the power trowel blades.

[0053] It should be understood that the access section is not necessarily hingedly connected to the rest of the power trowel. According to other aspects, at least one access section 140 of the protective cover 120 is arranged to be completely detached from the rest of the protective cover and removed from the power trowels 100, 1200. It is desirable that the operator of the access tool holder can, for example, lift one or more access sections from the power trowel to access the tool.

[0054] It may be desirable to manually rotate the tool set carrier 110, for example, to access a specific tool holder or to inspect the entire tool set carrier. This is especially useful when only a portion of the tool set carrier is exposed in the approach section (e.g., ...). Figures 1A to 1C (as in the example), especially so.

[0055] For example, refer to Figure 1C It should be noted that the access section 140 of the protective cover 120 is hinged to the polishing machine 100 to allow the access section 140 to pivot from a first position to a second position about a pivot axis P intersecting the first pivot point and the second pivot point 145. The first pivot point, the second pivot point 145, and therefore the pivot axis P are all located at a distance from the surface 101. In the illustrated example, this distance is less than the height of the skirt 125 of the power trowel 100. Three times, and preferably less than the height of the skirt 125 of the power trowel 100. Twice that of the surface 101. Therefore, the pivot axis P is positioned relatively close to the surface 101. The position close to the surface allows for a relatively large interval between the pivot points 145, which makes the pivoting movement of the approach section stable. It is worth noting that the approach section pivots about the pivot axis P close to the surface 101, and the approach section is formed as an element separate from the protective cover 120. The protective cover 120 can be regarded as a helmet of the type that protects the rotating tool of the polishing machine, while the approach section 140 can be regarded as a mask that can be raised without removing the protective cover in order to approach the tool. A key feature of the preferred embodiment taught herein is that the protective cover and the approach section are separate, so that the protective cover can remain in place when one or more approach sections are operated to approach the tool.

[0056] According to some aspects, the distance D1 between the first pivot point 145 and the second pivot point is at least 0.75 times the diameter D2 of the rotatable tool set carrier 110, and preferably at least as large as the diameter D2 of the rotatable tool set carrier 110. Figure 1C Distances D1 and D2 are shown. By making distance D1 greater than distance D2, similar to a visor on a helmet, the pivotable approach section 140 can pivot all the way down to surface 101. This improves protection through the approach section in the first position. At least one approach section 140 optionally includes a section of the floating skirt 125 of the polisher 100, such as Figures 1A to 1C As shown.

[0057] If from Figure 1C Viewed from a top-down perspective T of the power trowel 100, the protective cover 120 in its first position covers at least 90% of one or more rotatable tool set carriers 110, and preferably the entirety of one or more rotatable tool set carriers, which is also advantageous. This means that the protective cover maintains its protective function regardless of the position of the access section. In other words, even if the access section moves to its second position, the operator or others near the power trowel are protected by the protective cover.

[0058] An access section 140 movable between a first position and a second position extends on the outside of the protective cover 120. This simplifies the pivoting and / or removal of the access section because the access section will not interfere with the protective cover when it moves between its first and second positions. The access section 140 also advantageously includes a portion of the floating skirt 125 of the power trowel that is separate from the protective cage 120 of the power trowel 100.

[0059] In summary, the advantage is gained by configuring one or more access sections 140 on the power trowel as mask-like elements, which can pivot from a first position covering the tool holder to an open second position to allow access to the tool holder.

[0060] Figure 3 , Figures 4A to 4B , Figures 5A to 5B and Figure 6 Exemplary tool holders 110, 400, 500, and 600 suitable for use with power finishers 100 and 1200 are shown. As previously described, the tool holders are arranged to support one or more tool holders 130. All tool holders 110 include a central hub 310 arranged to be attached to a drive shaft, and all tool holders are arranged to rotate about a central axis of rotation A1 in a drive direction R1 in response to rotation of the drive shaft. An arm 320 extends radially outward from the central hub 310 to an attachment point 330 at which a tool can be attached. Figure 3The exemplary tool set carrier 110 has five arms. However, two, three, four, or more than five arms are also possible. Tool set carriers 110, 400, 500, and 600 are arranged to allow at least a portion of the tool set carrier to be manually rotated one revolution relative to the drive shaft about the central rotation axis A1. In these examples, the tool set carrier 110 extends in the carrier plane Pc, and the drive shaft extends in a direction perpendicular to the carrier plane Pc.

[0061] Figures 4A to 4B , Figures 5A to 5B and Figure 6 Different examples of how the manual rotation feature is implemented are shown. In all these examples, the central hub 310 includes first portions 410, 510, 610 and second portions 420, 520, 620. The first portions 410, 510, 610 are arranged to be rotatably fixed to the drive shaft, for example, via a keyway 440, while the second portions 420, 520, 620 are connected at least indirectly to the tool holder 130. The second portions 420, 520, 620 are supported on the first portions 410, 510, 610 to allow them to rotate relative to each other about the central rotation axis A1.

[0062] The first portions 410, 510, 610 and the second portions 420, 520, 620 together implement rotation limiting mechanisms 430, 530, 540, which prevent relative rotation between the first portions 410, 510, 610 and the second portions 420, 520, 620 from exceeding an angular range, and / or prevent rotation of the tool set carriers 110, 400 relative to the drive shaft in the drive direction R1, such that the tool set carrier will rotate in the drive direction R1 in response to rotation of the drive shaft. In some examples, the tool set carrier 110 is arranged to allow manual rotation of the tool set carrier 110 in a direction R1' opposite to the drive direction R1, and in some examples, the tool set carrier 110 is arranged to allow manual rotation of the tool set carrier 110 only in the drive direction R1. In the examples, the second portions 420, 520, 620 are arranged radially outward from the first portions 410, 510, 610. This means that the operator can rotate the tool set carrier to access different tools, and the drive shaft can also drive the tool set carrier during operation, allowing the operator to operate any locking mechanisms, such as those that allow manual rotation or drive mode.

[0063] Figure 4A A 3D diagram of the example is shown, and Figure 4BA cross-sectional view of an example is shown, in which the rotation stop mechanism 430 includes cooperating and radially overlapping heels 431, 432 arranged between a first portion 410 and a second portion 420 to prevent relative rotation between the inner portion 410 and the outer portion 420 from exceeding the angular range. Rotation about the central axis A1 in any direction R1, R1' is permitted as long as the radially overlapping heels do not abut against each other. As the drive shaft rotates, the heels will eventually abut against each other, allowing the drive torque from the drive shaft to be transmitted to the tool set carrier.

[0064] A keyway 440 is formed in the first portion 410 to provide rotational locking of the drive shaft.

[0065] exist Figures 5A to 5B and Figure 6 In the rotating stop mechanisms 530 and 630, a ratchet mechanism is included, which is configured to prevent the tool set carriers 110, 500, and 600 from rotating relative to the drive shaft in a direction R1' opposite to the drive direction R1. The ratchet mechanism 530 may, for example, include cooperating ratchet rings 531 and 532, which are respectively attached to the first portion 510 and the second portion 520, as shown below. Figures 5A to 5B The example is illustrated below. For instance... Figure 6 As shown, the ratchet mechanism 630 may further include a ratchet 631 connected to one of the first portion 610 and the second portion 620, and one or more spring-loaded pawls 632 connected to the other of the first portion 610 and the second portion 620. It should be noted that in Figure 6 An optional spring 640 biases the pawl 632 toward the ratchet 631. Torsion springs and the like can of course be used to have a similar effect, i.e., bias the pawl 632 toward the ratchet 631.

[0066] Figure 15 Another example of a tool set carrier 1500 is shown, which is arranged to allow at least a portion of the tool set carrier to be manually rotated one revolution relative to the drive shaft about a central rotation axis A1. In this case, the central hub of the tool set carrier 1500 includes a rotary locking mechanism 1510, which is arranged to engage with a corresponding portion fixed to the drive shaft in a rotary locking engagement.

[0067] The tool set carrier 1500 is slidably arranged along the central axis of rotation A1. When the polishing machine 100 rises from the surface 101, for example, as... Figure 15 As shown, the tool set carrier moves away from the base of the power trowel 100 along the rotation axis A1, and this movement disengages the rotation locking mechanism to allow the tool set carrier to be manually rotated relative to the drive shaft.

[0068] In Example 1500, the rotary locking mechanism 1510 includes a set of teeth 1520 arranged to engage with matching recesses formed in the fixed relationship relative to the drive shaft. Therefore, if the tool carrier is pressed against the chassis of the power trowel 100, the rotary locking mechanism 1510 engages to allow the drive shaft to drive the tool carrier. If the tool carrier is axially removed from the chassis, the rotary locking mechanism 1510 disengages to allow the tool carrier to be manually rotated in both directions R1, R1'.

[0069] Power trowels are frequently used in harsh environments where dust and slurry can accumulate and impair performance. To achieve good final results after surface grinding, it is preferable that the tool holder is rotatably connected to the tool set carrier, i.e., allowing the tool holder to rotate freely about its rotation axis A2. By rotating the tool holder about its central axis A2 during use, a more uniform grinding result is obtained. The tool set carrier 110 is then driven by the drive torque from the power trowel drive shaft, and the tool holder passively rotates about its corresponding rotation axis A2. This passive rotation can be hindered by dust and slurry accumulating near the rotation axis of the tool holder.

[0070] To handle surfaces that are not perfectly flat, a tool holder with inhomogeneities suitable for the surface being treated is preferred. For this purpose, it is desirable to provide a tool holder capable of pivoting relative to its rotation axis. It is also advantageous if the pivoting relative to the tool holder's rotation axis is biased toward a horizontal position of the tool holder, where the tool holder's rotation axis A2 is perpendicular to the tool holder's plane Ph, such as... Figure 8 and Figure 9 As shown, this will be discussed in more detail below. This bias toward the horizontal position can be obtained, for example, through a resilient bushing, as will be discussed in more detail below.

[0071] Compared to using a fixed, non-pivoting tool holder, improved surface finish results can be achieved even if the tool holder can only pivot about a single pivot axis. Such a universal joint with a single pivot axis can be obtained directly by replacing one of the universal joints in the example with a fixed, non-pivoting support. For example, to obtain a universal joint from... Figure 10 The example in the text begins with a single pivot axis universal joint; it would be sufficient to replace the portion of the universal joint including the second universal joint 770 with a fixed attachment to the tool holder plate 720. This would result in the tool holder comprising a tool holder plate capable of pivoting only about the first universal pivot axis C1.

[0072] However, preferably, the tool holder is pivotable about a first pivot axis and a second pivot axis that extend laterally or even vertically relative to each other. This disclosure is not limited to tool holders arranged to pivot about two different pivot axes, but also includes tool holders having a single pivot axis.

[0073] Figures 7 to 9 Exemplary tool holders 130 and 700 for power trowels 100 and 1200 are shown. Tool holders 130 and 700 include a central hub 710 and a tool holder plate 720. The central hub 710 is arranged to attach to a tool set carrier 110, making it usable for working surfaces 101, such as concrete or stone surfaces. Universal joints 730 and 740 pivotally connect the central hub 710 to the tool holder plate 720, allowing the tool holder plate 720 to pivot relative to the central hub 710 about a first universal pivot axis C1 and a second universal pivot axis C2. However, it should be noted that the second universal pivot axis is optional, as only one pivot axis is required for successful use of the tool holder. The first universal pivot axis C1 and the second universal pivot axis C2 are orthogonal in the illustrated example, although this is not strictly necessary. In this way, the tool holder is able to absorb unevenness in the surface being processed, resulting in better end results.

[0074] The center hub 710 also includes a bearing 910 supported on the universal joints 730, 740 to allow relative rotation R2 between the center hub 710 and the tool holder plate 720 about the tool holder rotation axis A2.

[0075] Figure 9 In the example shown, the radially inner portion of bearing 910 is fixed to the central hub 710, while the radially outer portion of bearing 910 is fixed to the rotating portion of the tool holder. The axis of rotation of bearing 910 is aligned with the axis of rotation A2 of the tool holder. This means that the radially inner portion of the bearing does not rotate relative to the tool set carrier, and the radially outer portion of the bearing rotates together with the rotating portion of the tool holder.

[0076] Bearing 910 can be a sealed bearing. A sealed bearing means that there is a housing that contains the bearing's balls or rollers, preventing dust and slurry from penetrating the bearing and causing problems. Sealed bearings also do not require regular lubrication or maintenance, which is advantageous. A sealed bearing is a bearing that includes some form of sealing structure between the bearing's balls or rollers and the surrounding environment.

[0077] According to some aspects, the labyrinthine structure 810, configured to prevent dust and slurry from passing through, is arranged to connect with the bearing 910, i.e., radially outward relative to the bearing. The cover 920 may also be arranged to enclose the volume including the bearing. The cover 920 is attached from below the tool holder and is preferably held in place by an interference fit or snap-lock. The cover covers the bearing from below, thereby preventing dust and slurry from contacting the bearing from below. Figure 9 In the example, the cover engages the rotating portion and therefore rotates together with the rotating portion and with the radially outer portion of the bearing 910.

[0078] To improve protection of the internal structures of these tool retainers, resilient seals or gaskets (such as V-ring seals or shaft seals) can be radially arranged on the outside of the bearing 910, preferably connected to the labyrinth structure 810. The seal will then be connected around the journal of the central hub 310 to seal the same passage as the labyrinth structure 810. Note that the labyrinth structure is not inseparably connected to the seal; that is, the two can be used independently or in combination.

[0079] Figures 7 to 9 Exemplary tool holders 130 and 700 for power finishing machines 100 and 1200 are shown. Tool holders 130 and 700 include a central hub 710 and a rotating portion arranged to rotate R2 relative to the central hub 710 about a tool holder rotation axis A2. The central hub 710 is arranged to be attached to a tool set carrier 110. The rotating portion includes universal joints 730 and 740 and a tool holder plate 720. Universal joints 730 and 740 pivotally connect the central hub 710 to the tool holder plate 720, allowing the tool holder plate 720 to pivot relative to the central hub 710 about at least a first universal joint pivot axis C1, wherein the central hub 710 is fixed to a bearing 910, which is supported on the rotating portion to allow relative rotation R2 between the central hub 710 and the rotating portion about the tool holder rotation axis A2. The bearing 910 is at least partially surrounded by the rotating portion, as shown in the diagram. Figure 9 As shown in the example.

[0080] The tool holder 700 includes an upper support member 750 pivotable relative to a tool holder plate 720, allowing relative rotation between the upper support member 750 and the tool holder plate 720 about a first universal pivot axis C1. The upper support member 750 may be the upper plate of the universal joint, i.e., a planar support member having an extension substantially parallel to the tool holder plate in the nominal (non-pivoting) position of the tool holder. However, the upper support member 750 need not be a planar assembly.

[0081] The upper support member 750 is pivotally connected to a second universal joint 770 extending transversely to the first universal joint 760 via an aligned first universal joint 760. In other words, the first universal joint is divided into two axially aligned portions with a gap between them to allow the second universal joint to pass laterally through or at least perpendicularly close to the first universal joint in the same plane. Advantageously, the universal joint devices 730, 740 include a first universal joint 760 divided into two axially aligned portions intersecting with the second universal joint 770 extending transversely to the first universal joint 760, as this reduces the build height of the tool holder. The second universal joint 770 can, of course, also be divided into two axially aligned portions.

[0082] According to some aspects, the universal joint includes a first universal joint 760 and a second universal joint 770, wherein at least one universal joint extends radially from one end of the universal joint through a bearing 910 to the other end of the universal joint. Thus, one of the universal joints is an uninterrupted shaft. The other universal joint may be divided into two axially aligned portions with a gap between them as described above, in order to limit the overall build height of the tool holder.

[0083] The second universal joint 770 is pivotally connected to the tool holder plate 720, allowing relative rotation between the upper support member 750 and the tool holder plate 720 about a second directional pivot axis C2. This allows relative rotation about two transverse axes, improving the efficiency of the tool holder in machining concrete surfaces, especially uneven ones.

[0084] The upper support member 750 may be an elongated shape extending in the direction of the first universal pivot C1.

[0085] The central hub 710 of the tool holder 700 is rotatably attached to the upper support member 750, which means that the entire tool holder 700 can rotate freely about the tool holder rotation axis A2.

[0086] The upper support member 750 of the exemplary universal joint shown in the accompanying drawings extends between the opposite ends of the universal joint (i.e., between the distal ends of the first universal joint axis) in the direction of the first universal pivot axis C1. A bearing 910 is at least partially embedded in the upper support member 750. This reduces the overall build height of the tool holder 700, measured along the rotation axis A2, and also protects the bearing from impacts during operation.

[0087] The center hub 710 preferably extends over the entire bearing and forms a labyrinth structure 810 on the radially outer side of the bearing 910.

[0088] A resilient bushing 930 (e.g., a rubber bushing) may be arranged to support the first and second universal joints. Thus, the universal joints are supported by bushings that are pressed together and rotatably fixed. Any rotation of the tool holder plate 720 about axes C1 and C2 will generate tension in the bushings and a thrust returning to a nominal position, preferably configured such that axis A2 is perpendicular to the tool holder plate 730. In summary, the universal joint device may include a first universal joint 760 and a second universal joint 770, wherein each universal joint is supported at its end point by a resilient bushing 930 that is rotatably fixed. A coil spring or similar device with similar effects may be used.

[0089] The universal joint 700 has an upper portion including an upper support member 750. The upper support member supports a center hub 710. The universal joint also has a lower portion attached to a tool holder plate 720. The center hub 710 is the position where the tool holder is rotatably attached to the tool set carrier, allowing it to rotate about axis A2. This attachment between the tool holder and the tool set carrier allows the tool holder to... Figure 8 and Figure 9 Rotate in the plane Ph shown.

[0090] The upper portion is pivotally attached to the lower portion, allowing it to pivot about axis C1. This pivotable attachment is achieved via a first universal joint 760 supported on the lower portion along axis C1. The upper portion does not directly contact the tool holder plate 720, as... Figure 10 It is visible in the text.

[0091] The lower part pivotally supports the upper part and is directly attached to the tool holder plate 720 at the end supports 771 and 772, and the second universal joint 770 is supported against the end supports 771 and 772.

[0092] See Figures 7 to 10 We noticed some interesting geometric relationships. For example, Figure 9 The exemplary bearing 910 shown rotatably connects the center hub 710 and the upper support member 750 of the universal joints 730, 740. The bearing 910 is at least partially embedded in the upper support member 750 to limit the total build height Bh of the tool holder.

[0093] A plane Pb, orthogonal to the rotation axis A2 of the tool holder and intersecting the axial center of the bearing 910, intersects the upper support member 750 or separates the upper support member 750 from the tool holder plate 720. This means that the bearing is relatively deeply embedded in the universal joint, in this case, in the upper support member of the universal joint.

[0094] exist Figure 9 In the example, the balls or rollers of bearing 910 are located below the upper surface of upper support member 750.

[0095] Along Figure 9 The total build height Bh of the tool holder, measured by the rotation axis A2 of the tool holder shown, is less than 20 times the build height Bp of the tool holder plate 720, and preferably less than 15 times the build height Bp of the tool holder plate 720.

[0096] See Figure 10 When the tool holder plate 720 pivots relative to the tool carrier arm 320 about axis C2, there is relative movement between the support surfaces at the end supports 771, 772 and the second universal joint 770. When the tool holder plate 720 pivots relative to the tool carrier arm 320 about axis C1, there is relative movement between the support surface at the center of the lower portion and the first universal joint 760. When the tool holder plate 720 rotates about axis A2, there is relative movement between the support surface in the central hub 710 and the axis extending to the attachment point 330 of the tool carrier arm 320.

[0097] The tool holder plate 720 preferably includes a plurality of cutout portions or recesses 725 arranged to accommodate a portion of the universal joint 730 to allow rotation about axes C1 and C2. These cutout portions reduce the build height of the tool holder, which is advantageous.

[0098] In some cases, the passive rotation R2 of the tool holder 130 about the tool holder rotation axis A2 on a known power finisher may fail, or may only occur intermittently, which can be detrimental to the final result. To improve the passive rotation R2 of the tool holder about the tool holder rotation axis A2, it is possible to... Figure 10 The biasing element 1010 is arranged as an example. The biasing element generates an increased normal force F at a position offset by a distance O from the rotation axis A2 of the tool holder. This asymmetry of the normal force on the tool holder excites the passive rotation of the tool holder 130.

[0099] In other words, it also refers to Figure 11Disclosed are tool holders 110 and 1000 for power finishing machines 100 and 1200, wherein the tool holders 110 and 1000 extend in a tool holder plane Pc and are arranged to rotate about a central rotation axis A1 in a drive direction R1 in response to rotation of a drive shaft. The tool holders 110 and 1000 are arranged to rotatably support one or more tool holders 130 at a corresponding radial distance D1 from the central rotation axis A1, wherein each tool holder 130 is arranged to rotate R2 about a corresponding tool holder rotation axis A2. The tool holders 110 and 1000 include one or more biasing elements 1010 arranged to apply a force F to the corresponding tool holder 130 in a direction transverse to the tool holder plane Pc at a position offset by a distance O relative to the tool holder rotation axis A2.

[0100] At least one of these biasing elements 1010 may include a spring-loaded wheel 1020, such as in Figure 10 In the example shown, the rolling direction is arranged perpendicular to the radial direction of the tool holder 130. The wheel can roll freely in a circle around the tool holder plate 720.

[0101] According to some aspects, at least one of these biasing elements 1010 includes a force adjustment mechanism configured to adjust the force F applied by the biasing element 1010 by a configurable amount. The force adjustment mechanism may, for example, include a variable pretension of a spring-loaded wheel. The biasing element may be configured in two or more predetermined positions where the force can be increased by selection by the operator of the power finisher 100.

[0102] It should be understood that the biasing element 1010 can be attached to the center portion of the tool holder 130, 700 rather than to the tool carrier arm 320, because the center portion of the tool holder does not rotate relative to the arm 320, as... Figure 11 The rightmost bias element 1100 is shown.

[0103] It should be understood that the biasing element 1010 does not depend on the attachment between the tool holder and the tool set carrier arm 320. In other words, the above regarding Figures 7 to 9 The universal joint and biasing device 1010 discussed are not inextricably linked.

[0104] Figure 13This is a flowchart illustrating methods for inspecting, repairing, replacing, and / or altering tools on power trowels 100 and 1200 according to various teachings herein. The power trowel includes one or more rotatable tool set carriers 110 arranged to support respective sets of tool holders 130 for working surface 101. The power trowel includes a protective cover 120 configured to at least partially surround the one or more rotatable tool set carriers 110, wherein at least one access section 140 configured to be connected to the protective cover 120 is arranged to move between a first position where the tool set carrier 110 is covered and a second position where the tool set carrier 110 is uncovered, to allow access to at least one of the tool holders 130 from outside the protective cover 120. The method includes: Move the approach segment 140 from its first position to its second position by S1. At least one tool holder 130 of S2 is accessible from the outside of the protective cover 120, and Inspect, repair, replace and / or modify the tools supported by the tool holder 130 in S3.

[0105] Inspection tools may include, for example, visual inspection or the use of some type of measuring device (such as calipers) to measure tool wear.

[0106] Replacing and changing tools can refer to replacing a worn tool with a new tool of the same type, or changing a tool to a tool of a different granularity or type.

[0107] Figure 14 An example of servicing a tool supported by a tool holder 130 is shown. The ride-on power trowel 100 has been lifted from surface 101 by a service cart 1400. Lifting the power trowel 100 from the ground makes the tools easier to access and also makes it easier to rotate the tool carrier 110 as described above.

[0108] The service cart 1400 may include an elongated handle portion 1410, which an operator can use to guide the service cart. Figure 14 In the example shown, the handle portion also functions as a lever, which can be used to pivot the service cart around the support wheel 1420, as... Figure 14 As shown. The service vehicle has a joint 1430, which is arranged to engage the polishing machine 100 so as to lift the polishing machine 100 from the surface 101.

[0109] The support block 1450 can be inserted below the power trowel 100 to hold it in the raised position.

[0110] The service vehicle 1400 may include jacks, spindles, or other mechanisms that allow the heavy machinery 100 to be manually raised from the ground 100 by an operator.

[0111] It should be understood that when inspecting, repairing, replacing, and / or changing S3 tools, such as in conjunction with... Figures 4A to 4B , Figures 5A to 5B and Figure 6 The mechanism discussed, which allows manual rotation of the tool set carrier, is useful because different tools on the tool set carrier can be accessed one by one by manually rotating the tool set carrier.

[0112] To allow manual rotation, it may be necessary to release the normal force on the tool set carrier, i.e., the weight of the power trowel on the tool set carrier. This can be achieved by lifting the power trowel slightly off the ground, for example, using a lever device or jack tool (such as a pallet jack). Some power trowels also include a tool set carrier and drive shafts that can be lifted vertically to release pressure on the tools.

Claims

1. A power trowel (100, 1200) comprising one or more rotatable tool holders (110) arranged to support corresponding tool holders (130) for treating a surface (101), The power trowel (100, 1200) includes a protective cover (120) configured to at least partially surround the one or more rotatable tool carriers (110). in, At least one access section (140) configured to connect with the protective cover (120) is arranged to move between a first position and a second position, in which the tool set carrier (110) is covered and in the second position, the tool set carrier (110) is uncovered to allow access to at least one of the tool holders (130) from outside the protective cover (120). At least one of the tool set carriers (110) includes a central hub (310) arranged to be attached to a drive shaft, wherein the tool set carrier (110) is arranged to rotate in a drive direction (R1) about a central axis of rotation (A1) in response to rotation of the drive shaft, wherein the tool set carrier (110) is arranged to allow at least a portion of the tool set carrier (110) to be manually rotated one revolution relative to the drive shaft about the central axis of rotation (A1).

2. The power trowel (100, 1200) according to claim 1, wherein, A skirt (125) is provided between the protective cover (120) and the surface (101), the skirt being arranged around the edge of the protective cover (120).

3. The power trowel (100, 1200) according to claim 2, wherein, The skirt (125) is arranged to float (F) relative to the protective cover (120) in use and is supported by the surface (101).

4. The power trowel (100, 1200) according to claim 2 or 3, wherein, The vertical position of the skirt (125) relative to the surface (101) is adjustable during use.

5. The power trowel (100, 1200) according to any one of the preceding claims, wherein, Each approach section (140) of the protective cover (120) is arranged such that a portion of the corresponding tool set carrier (110) is uncovered when in the second position, wherein the uncovered portion of the corresponding tool set carrier (110) corresponds to at least one-third of the periphery of the tool set carrier (110).

6. The power trowel (100, 1200) according to any one of the preceding claims, wherein, At least one access section (140) of the protective cover (120) is hinged to the polishing machine (100, 1200) about at least one pivot point (145) to allow the access section (140) to pivot (U) from the first position to the second position.

7. The power trowel (100, 1200) according to claim 6, wherein, When the distance moves from the first position toward the second position by less than a predetermined angle, at least one hinged approach section (140) is biased toward the first position by a spring-loaded hinge device (200).

8. The power trowel (100, 1200) according to any one of the preceding claims, wherein, When the distance moves from the first position toward the second position by a predetermined angle, at least one hingedly connected proximity section (140) is biased toward the second position by a spring-loaded hinge device (200).

9. The power trowel (100, 1200) according to any one of claims 1 to 5, wherein, At least one access section (140) of the protective cover (120) is arranged to be disconnected from the rest of the protective cover and removed from the polishing machine (100, 1200).

10. The power finishing machine (100) according to any one of the preceding claims, wherein, The power trowel is a ride-on power trowel with two rotatable tool set carriers (110), wherein two sections of the protective cover (120) are arranged to move between corresponding first and second positions.

11. The power trowel (1200) according to any one of claims 1 to 9, wherein, The power trowel is a hand-held power trowel (1200) with a rotatable tool set carrier (110), wherein a section of the protective cover (120) is arranged to move (U) between a corresponding first position and a second position.

12. The power trowel (100, 1200) according to any one of the preceding claims, wherein, At least one access section (140) of the protective cover (120) is hingedly connected to the power trowel (100, 1200) to allow the access section (140) to pivot (U) from the first position to the second position about a pivot axis (P) intersecting the first pivot point and the second pivot point (145) on the power trowel (100, 1200), wherein the pivot axis (P) is located at a distance (U) from the surface (101). At that location, the distance is less than the height of the skirt (125) of the polishing machine (100). The height of the skirt (125) of the polishing machine (100) is three times that of the skirt (125) and preferably less than that of the polishing machine (100). Twice as much as 1.

13. The power trowel (100, 1200) according to any one of the preceding claims, wherein, At least one access section (140) of the protective cover (120) is hingedly connected to the power finisher (100, 1200) to allow the access section (140) to pivot (U) from the first position to the second position about a pivot axis (P) intersecting the first pivot point and the second pivot point (145), wherein the distance (D1) between the first pivot point and the second pivot point (145) is at least 0.75 times the diameter (D2) of the rotatable tool set carrier (110), and preferably at least as large as the diameter (D2) of the rotatable tool set carrier (110), and more preferably, larger than the diameter (D2) of the rotatable tool set carrier (110).

14. The power trowel (100, 1200) according to any one of the preceding claims, wherein, When viewed from a top view (T) of the polishing machine (100), the protective cover (120) in the first position covers at least 90% of the one or more rotatable tool set carriers (110), and preferably covers all of the one or more rotatable tool set carriers.

15. The power trowel (100, 1200) according to any one of the preceding claims, wherein, At least one proximity section (140) includes a section of the floating skirt (125) of the power trowel (100).

16. The power trowel (100, 1200) according to any one of the preceding claims, wherein, At least one access section (140) extends outward relative to the one or more rotatable tool carriers of the protective cover (120).

17. The power trowel (100, 1200) according to any one of the preceding claims, wherein, At least one approach section (140) includes a portion of the floating skirt (125) of the power trowel that is separated from the protective cage (120) of the power trowel (100).

18. A tool set carrier (110) for a power trowel (100, 1200). in, The tool set carrier (110) is arranged to support one or more tool holders (130). The tool set carrier (110) includes a central hub (310) arranged to be attached to a drive shaft, wherein the tool set carrier (110) is arranged to rotate in the drive direction (R1) about a central axis of rotation (A1) in response to rotation of the drive shaft. The tool set carrier (110) is arranged to allow at least a portion of the tool set carrier (110) to be manually rotated one revolution around the central axis of rotation (A1) relative to the drive shaft.

19. The tool set carrier (110) according to claim 18, wherein, The tool set carrier (110) is arranged to allow manual rotation in the drive direction (R1).

20. The tool assembly carrier (110) according to claim 18 or 19, wherein, The tool set carrier (110) extends in a carrier plane (Pc), and the drive shaft extends in a direction perpendicular to the carrier plane (Pc).

21. The tool set carrier (110) according to any one of claims 18 to 20, wherein the tool set carrier is arranged to support a plurality of tool holders (130) on corresponding arms (310) that extend radially outward from the central axis of rotation (A1).

22. The tool set carrier (110, 400) according to any one of claims 18 to 21. in, The central hub (310) includes a first portion (410, 510, 610) arranged to be rotatably fixed to the drive shaft and a second portion (420, 520, 620) connected to the tool holder (130). The second portion (420, 520, 620) is supported on the first portion (410, 510, 610) to allow the first and second portions to rotate relative to each other about the central rotation axis (A1). The first part (410, 510, 610) and the second part (420, 520, 620) together form a rotation limiting mechanism (430, 530, 540), which prevents the relative rotation between the first part (410, 510, 610) and the second part (420, 520, 620) from exceeding an angular range, and / or prevents the tool set carrier (110, 400) from rotating relative to the drive shaft in a direction opposite to the drive direction (R1).

23. The tool assembly carrier (110, 400) according to claim 22, wherein, The second portion (420, 520, 620) is arranged radially outward relative to the first portion (410, 510, 610).

24. The tool assembly carrier (110, 400) according to claim 22 or 23, wherein, The rotation stop mechanism (430) includes cooperating and radially overlapping heels (431, 432) arranged between the first portion (410) and the second portion (420) to prevent relative rotation between the inner portion (410) and the outer portion (420) from exceeding the angular range.

25. The tool set carrier (110, 500, 600) according to any one of claims 22 to 24, wherein, The rotation stop mechanism (530, 630) includes a ratchet mechanism configured to prevent the tool set carrier (110, 500, 600) from rotating relative to the drive shaft in a direction (R1') opposite to the drive direction (R1).

26. The tool set carrier (110, 500, 600) according to claim 25, wherein, The ratchet mechanism (530) includes a plurality of cooperating ratchet rings (531, 532) that are respectively attached to the first portion (510) and the second portion (520).

27. The tool set carrier (110, 500, 600) according to claim 25, wherein, The ratchet mechanism (630) includes a ratchet (631) connected to one of the first part (610) and the second part (620) and one or more spring-loaded pawls (632) connected to the other of the first part (610) and the second part (620).

28. A method for inspecting, repairing, replacing, and / or altering tools on a power trowel (100, 1200), the power trowel comprising one or more rotatable tool set carriers (110) arranged to support corresponding tool holders (130) for treating a surface (101), The power trowel (100, 1200) includes a protective cover (120) configured to at least partially surround the one or more rotatable tool carriers (110). in, At least one access section (140) configured to connect with the protective cover (120) is arranged to move between a first position and a second position, in which the tool set carrier (110) is covered and in the second position, the tool set carrier (110) is uncovered to allow access to at least one of the tool holders (130) from outside the protective cover (120). The method includes: Move (S1) the approach segment (140) to the second position of the approach segment. At least one of the tool holders (130) is approached (S2) from the outside of the protective cover (120), and Inspect, repair, replace and / or modify (S3) the tool supported by the tool holder (130).

29. A tool holder (130, 700) for a power trowel (100, 1200). The tool holder (130, 700) includes a central hub (710) and a rotating portion arranged to rotate (R2) relative to the central hub (710) about the tool holder's rotation axis (A2), wherein, The central hub (710) is arranged to be attached to the tool set carrier (110), and wherein the rotating portion includes a universal joint (730, 740) and a tool retainer plate (720). The universal joints (730, 740) pivotally connect the center hub (710) to the tool holder plate (720) to allow the tool holder plate (720) to pivot relative to the center hub (710) about at least a first universal pivot axis (C1). The central hub (710) is fixed to a bearing (910) supported on the rotating part to allow relative rotation (R2) between the central hub (710) and the rotating part about the rotation axis (A2) of the tool holder. The bearing (910) is at least partially surrounded by the rotating portion.

30. The tool holder (130, 700) according to claim 29, wherein, The bearing (910) is a sealed bearing.

31. The tool holder (130, 700) according to claim 29 or 30, wherein, The radially inner portion of the bearing (910) is fixed to the central hub (710), and the radially outer portion of the bearing (910) is fixed to the rotating portion of the tool holder.

32. The tool holder (130, 700) according to any one of claims 29 to 31, wherein, The upper support member (750) of the universal joint extends between opposite sides of the universal joint in the direction of the first universal pivot axis (C1) and is located at least above the first universal pivot axis (C1), wherein the bearing (910) is at least partially embedded in the upper support member (750).

33. The tool holder (130, 700) according to claim 32, wherein, A plane (Pb) orthogonal to the rotation axis (A2) of the tool holder and intersecting the axial center of the bearing (910) intersects the upper support member (750) or separates the upper support member (750) from the tool holder plate (720).

34. The tool holder (130, 700) according to claim 32 or 33, wherein, The axial center of the balls or rollers of the bearing (910) is located below the upper surface of the upper support member (750).

35. The tool holder (130, 700) according to any one of claims 29 to 34, wherein, A labyrinthine structure (810) configured to prevent dust and slurry from passing through is arranged to connect with the bearing (910).

36. The tool holder (130, 700) according to any one of claims 29 to 35, wherein, A seal, such as a V-ring seal or a radial shaft seal, is provided between the central hub (710) and the rotating part, the seal being connected around the journal of the central hub (710).

37. The tool holder (130, 700) according to any one of claims 29 to 36, wherein, The cover (920) is arranged to enclose the volume containing the bearing (910).

38. The tool holder (130, 700) according to any one of claims 29 to 37, wherein, The universal device includes a first universal joint and a second universal joint (760, 770) associated with corresponding first universal joint pivot axis and second universal joint pivot axis (C1, C2), wherein each universal joint is supported at its end point by a rotatably fixed elastic bushing (930).

39. The tool holder (130, 700) according to any one of claims 29 to 38, wherein, The universal joint (730, 740) includes at least a first universal joint (760) which is divided into two axially aligned portions that intersect with a second universal joint (770) extending transversely to the first universal joint (760).

40. The tool holder (130, 700) according to any one of claims 29 to 39, wherein, The tool holder plate (720) includes a plurality of cutout portions (725) arranged to accommodate a portion of the universal joint (730).

41. The tool holder (130, 700) according to any one of claims 29 to 40, comprising a biasing element (1010) attached to the central hub (710), wherein, The biasing element (1010) is arranged to apply a force (F) transverse to the tool holder plate (720) at a position offset (O) from the rotation axis (A2) of the tool holder.

42. The tool holder (130, 700) according to any one of claims 29 to 41, wherein, The universal joint includes a first universal joint and a second universal joint (760, 770) associated with corresponding first universal joint pivot axis and second universal joint pivot axis (C1, C2), wherein at least one of the universal joints extends radially from one end of the universal joint across the bearing (910) to the other end of the universal joint.

43. The tool holder (130, 700) according to any one of claims 29 to 42, wherein, The total build height (Bh) of the tool holder, measured along the rotation axis (A2) of the tool holder, is less than 20 times the build height (Bp) of the tool holder plate (720), and preferably less than 15 times the build height (Bp) of the tool holder plate (720).

44. A power trowel (100) comprising one or more tool holders (130, 700) according to any one of claims 29 to 43.

45. A tool holder (130, 700) for a power trowel (100, 1200). The tool retainer (130, 700) includes a center hub (710) and a tool retainer plate (720). in, The central hub (710) is arranged to be attached to the tool set carrier (110). The universal joints (730, 740) pivotally connect the center hub (710) to the tool holder plate (720), thereby allowing the tool holder plate (720) to pivot relative to the center hub (710) about a first universal pivot axis (C1) and a second universal pivot axis (C2). The center hub (710) includes a sealed bearing (910) mounted on the universal joint (730, 740) to allow relative rotation (R2) between the center hub (710) and the tool holder plate (720) about the tool holder rotation axis (A2).

46. ​​The tool holder (130, 700) according to claim 45, wherein, A labyrinthine structure (810) configured to prevent the passage of dust and slurry is arranged to connect with the sealed bearing (910).

47. The tool holder (130, 700) according to claim 45 or 46, wherein, The cover (920) is arranged to enclose the volume containing the sealed bearing.

48. The tool holder (130, 700) according to any one of claims 45 to 47, wherein, The sealed bearing is at least partially surrounded by the tool retainer (700).

49. A tool set carrier (110, 1000) for a power trowel (100, 1200). in, The tool set carrier (110, 1000) extends within the tool set carrier plane (Pc) and is arranged to rotate in the drive direction (R1) about the central axis of rotation (A1) in response to the rotation of the drive shaft. The tool set carrier (110, 1000) is arranged to rotatably support one or more tool holders (130) at a corresponding radial distance (D1) from the central axis of rotation (A1), wherein each tool holder (130) is arranged to rotate (R2) about a corresponding tool holder axis of rotation (A2). The tool set carrier (110, 1000) includes one or more biasing elements (1010) arranged to apply a force (F) in a direction transverse to the plane (Pc) of the tool set carrier at a position offset (O) from the rotation axis (A2) of the tool holder on the respective tool holder (130).

50. The tool set carrier (110, 1000) according to claim 49, wherein, At least one of the biasing elements (1010) includes a spring-loaded wheel (1020) whose rolling direction is arranged perpendicular to the radial direction of the tool holder (130).

51. The tool set carrier (110, 1000) according to any one of claims 49 to 50, wherein, At least one of the biasing elements (1010) is attached to the arm of the tool set carrier.

52. The tool set carrier (110, 1000) according to any one of claims 49 to 51, wherein, At least one of the biasing elements (1010) is arranged between the central rotation axis (A1) of the tool set carrier and the rotation axis (A2) of the tool holder.

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