Patent Application
20130028696
The disclosure relates to implements for lifting loads, and more specifically a pallet fork for a wheel loader or other machinery.
United States Patent Application Publication Number 2010/0101895 relates to a pallet fork including a structural frame, a fork bar, a swing bar, and a pair of fork tines. The swing bar may be selectively inserted through a pair of locks, provided in the fork tines, to fix and restrict a swingable motion of the fork tines. Further, the swing bar can be conveniently stored onboard the pallet fork when it is inoperative.
In one aspect, the present disclosure provides a pallet fork including a frame and a fork tine. The frame supports a fork bar and a carriage plate. The fork bar and the carriage plate extend in a longitudinal direction. The fork tine is mounted to the fork bar. The fork tine has a swingable motion and a lateral motion relative to the fork bar. The fork tine includes a vertical leg and a horizontal leg. A bracket is attached to the vertical leg of the fork tine. A first locking member is selectively inserted in the bracket to engage the fork tine with the carriage plate and restrict the swingable motion of the fork tine.
In another aspect, the disclosure provides a method for locking a fork tine to a frame of a pallet fork. The method mounts the fork tine to a fork bar supported on the frame. The method then aligns a vertical leg of the fork tine with a carriage plate supported on the frame. Subsequently, the method inserts a first locking member in a bracket provided on the vertical leg, in order to engage the fork tine with the carriage plate and restrict a swingable motion of the fork tine.
Other features and aspects of this disclosure will be apparent from the following description and the accompanying drawings.
The top support tube 104 and bottom support tube 106 are secured together by sets of ribs, such as a set of inner ribs 108 and a set of outer ribs 110. The inner ribs 108 are the vertically oriented plates near a center point or a midplane of the top support tube 104 and the bottom support tube 106. The inner ribs 108 are structurally joined to the top support tube 104 and the bottom support tube 106 by welding, brazing, or any other practical means. The inner ribs 108 may be approximately parallel to one another, and approximately normal to the top support tube 104 and the bottom support tube 106. The inner ribs 108 are two separate plate-like members in the illustrated embodiment, however may be formed as a single plate or other element, or more than two plates, based on the design of the pallet fork 100.
Likewise, the outer ribs 110 are the vertically oriented plates close to the distal ends of the top support tube 104 and the bottom support tube 106. The outer ribs 110 are also structurally joined to the top support tube 104 and the bottom support tube 106 by welding, brazing, or any other practical means. The outer ribs 110 may be approximately parallel to one another. The outer ribs 110 may also be approximately normal to the top support tube 104 and the bottom support tube 106. The outer ribs 110 are two separate plate-like members in the illustrated embodiment, however may be formed as more than two individual plates or other elements, based on the design of the pallet fork 100.
The distal ends of the top support tube 104 and the bottom support tube 106 are joined by a pair of end plates 112. The end plates 112 may be structurally joined to the top support tube 104 and the bottom support tube 106 by welding, brazing, riveting, or any other practical means. The end plates 112 may be vertically oriented plate-like members, and may be approximately parallel to one another and approximately normal to the top support tube 104 and the bottom support tube 106.
Moreover, as illustrated in
In an embodiment, the pallet fork 100 may include a single fork bar 114 spanning between the end plates 112, or alternatively the fork bar 114 may be divided into two separate bars which may be joined at the center of the pallet fork 100. Dividing the fork bar 114 into two separate smaller bars facilitates assembling and disassembling as each bar will be shorter and also weigh less. In an embodiment, the carriage plate 116 may be structurally joined to the bottom support tube 106 by welding, brazing, bolts, screws, rivets, or any other practical means. In another embodiment, the carriage plate 116 may be formed integrally with the bottom support tube 106. However, in yet another embodiment, the carriage plate 116 may be provided anywhere between the top support tube 104 and the bottom support tube 106, and supported by the end plates 112, the inner ribs 108, and the outer ribs 110.
A pair of fork tines 118 are mounted to the fork bar 114. Each of the fork tines 118 may include a horizontal leg 120 and a vertical leg 122 which are approximately normal to one another. As illustrated in
In an embodiment, the first locking member 128 may include a head portion 130 and a shaft portion 132. The shaft portion 132 of the first locking member 128 is configured to be partially received in the opening 127 of the bracket 126 and partially adjoined to the carriage plate 116. Further, the head portion 130 of the first locking member 128 may have a through-hole 134, which is substantially aligned to a pair of apertures 136 provided on the bracket 126.
In an embodiment, a first pin 138 is configured to be selectively inserted in the through-hole 134 of the first locking member 128, and the apertures 136 of the bracket 126, to hold the first locking member 128 in the bracket 126. The first pin 138 may be a pull lock pin with a ring grip 140. In various other embodiments, the first locking member 128 may have different shape, for example, but not limited to, a looped shape, a folded/clamp shape, or any other practical shape. Moreover, the first locking member 128 may use a bolt and nut assembly to hold the first locking member 128 in the bracket 126.
In one embodiment, a locking plate 142 may be provided on the top support tube 104 of the frame 102. The locking plate 142 may have one or more notches 144. As illustrated in
As illustrated in
The pallet fork 100 may be used in a wheel loader, a track loader or any other machinery. The fork tines 118 can be fixed, or be allowed to swing about the fork bar 114 when the pallet fork 100 tilts forward. In addition, the fork tines 118 can be laterally moved along the fork bar for customizing according to palletized loads. In an aspect, the first and the second locking members 128 and 146 may be selectively used to restrict the swingable and the lateral motion of the fork tines 118, respectively.
As shown in
Subsequently, at step 604, the vertical leg 122 of the fork tine 118 may be aligned with the carriage plate 116, which is connected to the bottom support tube 106 of the frame 102 of the pallet fork 100. The alignment may be achieved by moving the fork tine 118 to bring the vertical leg 122 of the fork tine 118 in contact with the bottom support tube 106 of the frame 102.
Finally, at step 606, the first locking member 128 may be selectively inserted in the bracket 126 provided on the vertical leg 122 of the fork tine 118, to engage the fork tine 118 with the carriage plate 116 of the frame 102. The swingable motion of the fork tine 118 relative to the fork bar 114 supported on the frame 102 may be restricted by first locking member 128.
The first locking member 128 described above is a locking device including the head portion 130 and the shaft portion 132. Moreover, the first locking member 128 may be fixed or removed from the bracket 126 without any tools. Additionally, the first locking member 128 may not hamper visibility of an operator through the frame 102 to the ends of the fork tines 118 and also to the load to be picked-up. In an embodiment, as illustrated in
In yet another embodiment, the second locking member 146 may be inserted in the notch 144 of the locking plate 142 supported on the frame 102, as described above. The second locking member 146 may assist in restricting the lateral motion of the fork tine 118 relative to the fork bar 114. Moreover, the second locking member 146 may be held in the notch 144 by selectively inserting the second pin 156 in the second locking member 146. Additionally, the first locking member 128 and/or the second locking member 146 may be stored in the retainer 158 when not in use.
In an aspect of the illustrated embodiment, the carriage plate 116, the bracket 126, and the locking plate 142 are retrofittable to an existing pallet fork by a cost effective method including welding, brazing or riveting, or any other practical means.
While aspects of the present disclosure have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems and methods without departing from the spirit and scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.
