TWM649991U - Lifting device with adjustable stroke - Google Patents

Abstract

The present invention relates to a lifting device with an adjustable stroke including an outer tube, an inner tube, a first control assembly, a piston rod, a piston and a second control assembly. An outer chamber is formed between the outer tube and the inner tube, and a first oil chamber and an air chamber are defined in the outer chamber. The inner tube defines a second oil chamber therein which can communicate with the first oil chamber and a third oil chamber therein which can communicate with the second oil chamber. The first control assembly is provided at one end of the outer tube and can control whether the oil in the first oil chamber and the oil in the second oil chamber can flow or not. The second control assembly is arranged at one end of the piston rod and can control whether the oil in the second oil chamber and the oil in the third oil chamber can flow or not. The piston is arranged in the inner tube and connected to the piston rod. The third oil chamber is formed between the piston and the second control assembly. When the oil in the first and second oil chambers and the oil in the second and third oil chambers can communicate respectively, the total stroke of the piston rod can be adjusted. When the oil in the first and second oil chambers can communicate, the up and down adjustment of the seat can be operated.

Description

Adjustable stroke lifting device

The invention relates to a seat cushion lifting device suitable for bicycles, in particular to a lifting device with adjustable stroke.

In order to meet the needs of different rider heights, the height of the bicycle seat cushion needs to be designed to be adjustable. Conventional lifting devices for bicycles are generally installed between the seat tube and the seat cushion support tube of the bicycle. Through linear displacement, the relative positions of the seat tube and the seat cushion support tube can be changed to adjust the height of the seat cushion. Conventional bicycle seat cushion lifting structures are roughly divided into "mechanical", "pneumatic and hydraulic", and "hybrid". Among them, the "pneumatic and hydraulic" structure generally requires the use of a control component to control the seat cushion lifting. Specifically speaking, you need to operate the control component to adjust the seat cushion height so that the height of the seat cushion can be raised and lowered (i.e., the valve is open), and when the seat cushion is adjusted to a predetermined height, you need to operate the control component to adjust the seat cushion height. It is in a fixed state (i.e. closed valve state).

Generally, the seat cushion lifting structure of a bicycle only has a single maximum adjustment stroke, causing the height adjustment of the bicycle's seat cushion to be limited to this single maximum adjustment stroke. In order to allow the seat cushion height to have a variety of maximum adjustment strokes to meet the needs of different rider heights, manufacturers need to produce telescopic rods of various sizes with different adjustment strokes, which causes trouble in production.

Certificate No. M567823 discloses a stroke-adjustable pneumatic rod structure, which includes an outer tube, a middle tube, a first floating piston, an inner tube, a second floating piston, a push rod and a first control valve. Through the operation of the first control valve, the stroke of the pneumatic rod structure can be adjusted according to needs to solve the problem of the previous pneumatic rod structure having only a single stroke. However, the adjustment stroke range provided by the pneumatic rod structure in this case is limited, and the structure is still not perfect.

Therefore, how to provide an improved lifting device to increase the adjustable total stroke range and thereby improve the performance of the lifting device still needs to be studied and designed by the industry.

Therefore, the purpose of this creation is to provide an adjustable-stroke lifting device that is suitable for adjusting the seat height of bicycles and can adjust the maximum lifting stroke according to needs to apply to bicycle frames of different sizes, thereby increasing the maximum height. The adjustment range of the stroke and the reduction of the need to make lifting devices with different stroke specifications are efficiency enhancers.

The adjustable-stroke lifting device according to the present invention includes an outer tube, an inner tube, a first control component, an end seat, a piston rod, a piston and a second control component. The outer tube includes a top end and a bottom end. The inner tube is disposed inside the outer tube and includes a first end and a second end that are separated. The first end is adjacent to the top end of the outer tube, and the second end is adjacent to the bottom end of the outer tube. The outer tube is connected to the inner tube. An outer chamber is formed between the tubes. The outer chamber can accommodate oil and gas to define a first oil chamber and an air chamber. The interior of the inner tube defines a second oil chamber that can be communicated with the first oil chamber. and a third oil chamber communicated with the second oil chamber. The first control component is disposed at the bottom end of the outer tube and includes a first valve body and a first control pin. The first valve body is combined in the second end of the inner tube. There is a first valve hole and at least one first hole, the first hole communicates the first valve hole and the outer chamber, the first control pin movably passes through the first valve hole of the first valve body and It has a first sealing part that can openably close the first valve hole of the first valve body to control the oil in the first oil chamber and the oil in the second oil chamber to be able to circulate. Or out of circulation. The end seat is installed at the top of the outer tube, and a coupling hole extending along the longitudinal direction of the outer tube is provided inside the end seat to provide a first end coupling of the inner tube. The gas in the outer chamber can pass through the The end seat flows into this inner tube. The piston rod includes an inner end located inside the outer tube and an outer end located outside the outer tube. The inner end of the piston rod passes through the outer tube and the end seat. The piston is located in the inner tube and connected to the piston rod. The second control component is located in the inner tube and includes a second valve body and a second control pin. The second valve body is combined with the inner end of the piston rod. The second oil chamber in the inner tube is located at Between the first valve body and the second valve body, the third oil chamber in the inner tube is located between the second valve body and the piston. The second valve body is provided with a second valve hole and at least a second hole, the second valve hole is connected to the second oil chamber of the inner tube, the second hole is connected to the second valve hole and the third oil chamber, and the second control pin movably passes through the third oil chamber. The second valve hole has two valve holes and a second sealing portion. The second sealing portion can openably close the second valve hole to control whether the oil body in the second oil chamber and the oil body in the third oil chamber can flow or be connected. Not in circulation. When the first control pin of the first control component and the second control pin of the second control component are operated to move to open the first valve hole of the first valve body and the second valve hole of the second valve body, the The oil in the first oil chamber and the second oil chamber and the oil in the second oil chamber and the third oil chamber can circulate, so that the total stroke of the piston rod can be adjusted. When the first control pin of the first control component is operated alone to move to open the first valve hole of the first valve body and the second valve hole of the second valve body is closed, the first oil chamber and the second oil chamber The oil body in the room can circulate, so that the lifting height of the seat cushion can be adjusted.

In one embodiment, the lower section of the second valve hole has a second valve port, and the bottom of the second control pin has the second sealing portion and a second inclined portion. When the second sealing portion is in the second When the second slope is at the position of the second valve port, the second valve hole of the second valve body is closed by the second sealing part. When the second slope is at the position of the second valve port, the second valve hole of the second valve body is Open so that oil can flow through the second valve hole.

In one embodiment, the lower section of the second valve hole further has a recess, and the second control component further includes a bottom tube, a spring and a gasket. The bottom tube is installed in the bottom recess and the bottom tube is There is a spring seat inside, the first end of the spring is positioned in the spring seat of the bottom tube, the gasket is installed in the second valve port of the second valve hole, and the bottom of the second control pin abuts the spring .

In one embodiment, a first valve port and an opening are formed at the upper end of the first valve hole. A first sealing ring is provided in the first valve port, and a gasket is installed in the opening. The first control component further includes a The bottom of the movable ring is installed in the opening of the first valve body and against the gasket. The upper end of the first sealing part forms a flange, and the flange extends on the first side of the first valve body. Outside the valve hole and located within the movable ring, the outer diameter of the flange is slightly smaller than the inner diameter of the movable ring, so that there is a gap between the flange and the movable ring.

In one embodiment, the inner end of the first control pin is located in the second end of the inner tube and has a first sealing portion, a first small diameter portion, and a first sealing portion and a first small diameter portion connected to the first sealing portion and the first small diameter portion. When the first sealing part is at the position of the first valve port, the first valve hole of the first valve body is closed by the first sealing part. When the small diameter part is at the position of the first valve port, When the first valve port is in the first valve position, the first valve hole of the first valve body is opened so that oil can flow through the first valve hole.

In one embodiment, the inside of the coupling hole of the end seat has a shoulder to provide the first end of the inner tube with contact, and a reduced portion is formed in the upper section of the coupling hole, and the top end of the piston is provided with a cross-section An L-shaped positioning ring is inserted into the reduced portion of the coupling hole of the end seat when the piston is located in the first end of the inner tube.

In one embodiment, a slot is provided around the outer periphery of the end seat, so that the gas in the outer chamber can flow to the inner tube through the slot.

In one embodiment, there is a connecting hole in the top of the second valve body to provide for the inner end of the piston rod to be combined. The outer diameter of the top is smaller than the inner diameter of the inner tube, so that the inner tube is inside the second valve. The third oil chamber is defined between the body and the piston.

In one embodiment, an actuating rod is installed inside the piston rod, the actuating rod can be displaced along the longitudinal direction relative to the piston rod, and the actuating rod is in contact with the second control pin, so that the second control pin can be controlled by the Moves by operating the actuator lever.

Other objects, advantages and features of the present invention can be understood from the following detailed description of the preferred embodiments and with reference to the accompanying drawings.

The specific embodiments are only examples but not limiting, and the preferred structure of the present invention is described as follows with reference to the attached drawings:

Referring to Figures 1 to 8, a lifting device 1 according to an embodiment of the present invention is suitable for adjusting the height of a bicycle seat cushion. The lifting device 1 includes an outer tube 11 , an inner tube 12 , a first control component 13 , an end seat 14 , a piston rod 15 , a piston 16 and a second control component 17 .

The top end 111 of the outer tube 11 can be assembled under the bicycle seat cushion (not shown) through the support tube (not shown). The bottom end 112 of the outer tube 11 can be installed in the seat tube (not shown) of the bicycle frame. An oil seal assembly 18 is provided inside the top end 111 of the outer tube 11 to seal the top end 111 of the outer tube 11. In this embodiment, the oil seal assembly 18 includes an oil seal seat 181 and an oil seal 182.

The inner tube 12 is disposed inside the outer tube 11 and includes a separated first end 121 and a second end 122 . The first end 121 is adjacent to the top end 111 of the outer tube 11 , and the second end 122 is adjacent to the bottom end 112 of the outer tube 11 . An outer chamber 21 is formed between the outer tube 11 and the inner tube 12 . The outer chamber 21 can accommodate the oil body 22 and the gas 23 and define a first oil chamber 211 and an air chamber 212 . In this embodiment, the air chamber 212 is adjacent to the first end 121 of the inner tube 12 , and the first oil chamber 211 is adjacent to the second end 122 of the inner tube 12 . Furthermore, the interior (inner chamber) of the second end 122 of the inner tube 12 defines a second oil chamber 24 that can communicate with the first oil chamber 211 .

The first control component 13 is disposed at the bottom end 112 of the outer tube 11 and combined with the second end 122 of the inner tube 12 . In this embodiment, the first control component 13 includes a sealing seat 131 , a first valve body 132 , a first control pin 133 and a movable ring 134 . The sealing seat 131 is installed in the bottom end 112 of the outer tube 11. The sealing seat 131 is provided with a seat hole 1311 extending along the longitudinal direction of the outer tube 11. The top of the sealing seat 131 is provided with a joint portion 1312. The bottom 1321 of the first valve body 132 is coupled to the coupling portion 1312 of the sealing seat 131 , and the top 1322 of the first valve body 132 is coupled to the second end 122 of the inner tube 12 . A first valve hole 1323 and at least one first hole 1324 are provided inside the first valve body 132 . The first valve hole 1323 is along the outer tube 11

It extends longitudinally and communicates with the second oil chamber 24 of the inner tube 12 and the seat hole 1311 of the seal seat 131 . The first hole 1324 extends along the radial direction of the first valve body 132 and communicates with the first valve hole 1323 and the outer chamber 21 . In this embodiment, the upper end of the first valve hole 1323 has a stepped cross-section to form a first valve port 1325 and an enlarged opening 1326 (see Figure 8). A first sealing ring is provided in the first valve port 1325. 1327, a gasket 135 is installed in the opening 1326, and a hole 1351 is provided on the gasket 135. Furthermore, a plurality of O-rings 1328 are provided around the first valve body 132 .

The first control pin 133 movably passes through the seat hole 1311 of the sealing seat 131 and the first valve hole 1323 of the first valve body 132. In this embodiment, the inner end of the first control pin 133 is located in the inner tube 12 The second end 122 has a first sealing part 1331, a first small diameter part 1332, and a first slope part 1333 connected between the first sealing part 1331 and the first small diameter part 1332. The first sealing portion 1331 of the first control pin 133 can openably close the first valve hole 1323 of the first valve body 132, so that the oil body 22 in the first oil chamber 211 and the oil body 22 in the second oil chamber 24 The first control pin 133 can be used to control the circulation or non-circulation. Specifically, when the first sealing portion 1331 is located at the first valve port 1325, the first valve hole 1323 of the first valve body 132 is closed by the first sealing portion 1331 (see Figure 5), and when the small diameter portion When 1332 is at the first valve port 1325, the first valve hole 1323 of the first valve body 132 will be opened (see Figure 8), so that the oil body 22 can flow through the first valve hole 1323. The bottom of the movable ring 134 is installed in the opening 1326 of the first valve body 132 and abuts against the gasket 135 . In this embodiment, a flange 1334 is formed on the upper end of the first sealing part 1331. The flange 1334 extends outside the first valve hole 1323 of the first valve body 132 and is located in the movable ring 134. The outer diameter of the flange 1334 Slightly smaller than the inner diameter of the movable ring 134, so that there is a gap 136 between the flange 1334 and the movable ring 134 (see Figure 8).

The end seat 14 is installed on the top end 111 of the outer tube 11 and combined with the first end 121 of the inner tube 12 . A coupling hole 141 extending along the longitudinal direction of the outer tube 11 is provided inside the end seat 14 to provide the first end 121 of the inner tube 12 for insertion and coupling. In this embodiment, the interior of the coupling hole 141 has a shoulder 142 to provide the first end 121 of the inner tube 12 with abutment, and a reduced portion 143 is formed in the upper section of the coupling hole 141 . Notches 144 are respectively provided on the outer periphery and the top of the end base 14 so that the gas 23 in the outer chamber 21 can flow into the inner tube 12 through the notches 144 . Furthermore, an O-ring 145 is provided inside the coupling hole 141 of the end base 14 to form a seal.

The piston rod 15 includes an inner end 151 located inside the outer tube 11 and an outer end 152 located outside the outer tube 11 . The inner end 151 of the piston rod 15 passes through the oil seal seat 181 , the oil seal 182 and the end seat 14 in the outer tube 11 . Combined with the hole 141 and located within the inner tube 12 . The piston rod 15 has a rod hole 153 inside, and an actuating rod 19 is installed in the rod hole 153. The actuating rod 19 can be displaced relative to the piston rod 15 along the longitudinal direction. Furthermore, the inner end 151 has an annular groove 154 and an end portion 155 that reduces the outer diameter. An O-ring 156 is disposed in the annular groove 154, and a set of rings 157 is coupled to the end portion 155.

The piston 16 is disposed in the inner tube 12 and has a through hole 161 in the middle through which the inner end of the piston rod 15 can pass, so that the piston 16 is connected to the outer periphery of the piston rod 15 and can move up and down together. In this embodiment, an O-ring 162 is provided on the hole wall of the perforation 161 and on the outer periphery of the piston 16 respectively, so that there is an O-ring 162 between the piston 16 and the inner tube 12 and the piston rod 15 to prevent the gas 23 and the oil body 22 from passing through. Tightness. In this embodiment, the top of the piston 16 is provided with a positioning ring 163 with an L-shaped cross section. When the piston 16 is located in the first end 121 of the inner tube 12 , the positioning ring 163 can be inserted into the combining hole 141 of the end base 14 inside the reduced portion 143 to form positioning (see Figure 5).

The second control component 17 is disposed in the inner tube 12 and includes a second valve body 171, a bottom cylinder 172, a spring 173, a gasket 174 and a second control pin 175. There is a connecting hole 1715 in the top 1711 of the second valve body 171 to provide the inner end 151 of the piston rod 15 for insertion and coupling. The outer diameter of the top 1711 is smaller than the inner diameter of the inner tube 12, so that the inner tube 12 is connected to the second valve body 171. A third oil chamber 25 that can accommodate the oil body 22 is defined between the pistons 16 (see Figure 7). In this embodiment, the connecting hole 1715 contains a collar 157 and an O-ring 176 . The bottom 1712 of the second valve body 171 faces the first valve body 132 of the first control assembly 13, and the above-mentioned second oil chamber 24 is defined between the first valve body 132 and the second valve body 171 (see Figure 6). The outer diameter of the bottom 1712 of the second valve body 171 is approximately equal to the inner diameter of the inner tube 12, and an O-ring 177 is provided around the outer periphery of the second valve body 171 to form a seal (see Figure 7).

The second valve body 171 is further provided with a second valve hole 1713 and at least one second hole 1714 (see Figure 7). The second valve hole 1713 extends along the longitudinal direction of the outer tube 11 and communicates with the second oil chamber 24 of the inner tube 12 . The second hole 1714 extends along the radial direction of the second valve body 171 and communicates with the second valve hole 1713 and the third oil chamber 25 . In this embodiment, the second valve hole 1713 is connected with the connection hole 1715 in the top 1711 of the second valve body 171 . The lower section of the second valve hole 1713 has a stepped cross-section to form an enlarged second valve port 1717 and a recessed portion 1716. Furthermore, a hole 1718 is provided at the lower end of the second valve body 171. The bottom tube 172 is installed in the lower recess 1716 and has a spring seat 1721 inside. The bottom tube 172 has a plurality of holes 1722 at its lower end. The first end 1731 of the spring 173 is positioned within the spring seat 1721 of the bottom barrel 172 . The gasket 174 is installed in the second valve port 1717 of the second valve hole 1713 and has a through hole 1741 in the center of the gasket 174. The gasket 174 is provided with a hole 1742. The second control pin 175 is movably disposed in the second valve hole 1713 of the second valve body 171, and the upper end 1751 of the second control pin 175 extends into the connection hole 1715 to contact the actuating rod 19, so that the second control pin 175 The pin 175 is movable by operation of the actuating lever 19 . In this embodiment, the bottom 1752 of the second control pin 175 contacts the spring 173 and has a second sealing portion 1753 with an enlarged outer diameter and a second inclined portion 1754. The second sealing part 1753 is located in the through hole 1741 of the gasket 174 and the outer diameter of the second sealing part 1753 is approximately equal to the diameter of the second valve hole 1713, and a second sealing ring 178 is installed in the second valve port 1717. Seal the second valve hole 1713 (see Figure 5). The second sealing portion 1753 of the second control pin 175 can openably close the second valve hole 1713 of the second valve body 171 so that the oil body 22 in the second oil chamber 24 and the oil body 22 in the third oil chamber 25 The second control pin 175 can be used to control the circulation or non-circulation. Specifically, when the second sealing portion 1753 is located at the second valve port 1717, the second valve hole 1713 of the second valve body 171 is closed by the second sealing portion 1753 (see Figure 5), and when the second inclined surface When the portion 1754 is at the second valve port 1717, the second valve hole 1713 of the second valve body 171 will be opened (see Figure 7), so that the oil body 22 can flow through the second valve hole 1713. In this embodiment, the outer end of the second sealing portion 1753 forms a ring 1755, and a spring chamber 1756 is provided in the ring 1755 to provide positioning of the second end 1732 of the spring 173.

In the implementation of the lifting device 1 of this invention, the outer chamber 21 is filled with gas 23 with a preset pressure, and the inside of the inner tube 12 and the outer chamber 21 are filled with an oil body 22 (see Figure 5). Therefore, the lifting device 1 can respectively operate the first control component 13 and the second control component 17 through a control device (not shown in the figure, such as a handle, a pull rod or a button, etc.) to adjust the maximum stroke of the seat cushion and adjust the seat height. Pad height adjustment.

Regarding the adjustment of the maximum stroke, see Figure 6. To shorten the original maximum stroke (for example, 200mm) to a smaller maximum stroke (for example, 180mm), simultaneously operate the first control pin 133 of the first control component 13 and the second control pin 175 of the second control component 17 inward. Move to open the first valve hole 1323 of the first valve body 132 and the second valve hole 1713 of the second valve body 171 . Specifically, when the first control pin 133 is operated to move toward the second control assembly 17, the first valve hole 1323 will be opened, so that the oil body 22 in the first oil chamber 211 and the oil body 22 in the second oil chamber 24 To allow circulation, and when the actuating rod 19 is pushed to move the second control pin 175 toward the first control assembly 13 , the second valve hole 1713 will open, so that the oil body 22 in the second oil chamber 24 and the third oil chamber 25 The oil body 22 inside is flowable. In this state, the piston rod 15 is pressed down to move (for example, the seat cushion is pressed down to move the piston rod 15 inward), so that the second control assembly 17 and the piston rod 15 move toward the first control assembly 13 together, then the second oil chamber 24 The oil body 22 inside will flow to the first oil chamber 211 of the outer chamber 21 through the first valve hole 1323 and will flow to the third oil chamber 25 through the second valve hole 1713 and resist the piston 16 (see Figures 6 to 8 ). It should be noted that through the configuration of the movable ring 134, a smaller amount of oil 22 in the second oil chamber 24 flows toward the outer chamber 21 through the first valve hole 1323 (as shown in FIG. 8), and the third Most of the oil 22 in the second oil chamber 24 will flow toward the third oil chamber 25 and be enough to position the piston 16 in the first end 121 of the inner tube 12 (as shown in Figures 6 and 7). Therefore, the piston The rod 15 can move relative to the piston 16 to adjust the maximum stroke of the piston rod 15 (seat cushion) (that is, the portion of the piston rod 15 at the top 111 of the outer tube 11 will shorten, but the position of the piston 16 will not move). In addition, when the maximum stroke is adjusted to reach a predetermined position, the operations on the first control pin 133 of the first control component 13 and the second control pin 175 of the second control component 17 are released, and the first valve hole 1323 and the second valve hole 1713 will be closed so that the maximum stroke length is fixed.

If the user wants to shorten the maximum stroke again (for example, adjust from 180mm to 160mm), the first control pin 133 of the first control component 13 and the second control pin 175 of the second control component 17 are repeatedly operated to move inward, and then , press down the piston rod 15 to move, and the maximum stroke of the piston rod 15 (seat cushion) can be adjusted again. On the other hand, when the shortened maximum stroke is to be adjusted upward from the shortened maximum stroke to a higher maximum stroke (for example, 160 mm to 180 mm), the first control pin 133 and the second control pin 133 of the first control assembly 13 are operated. The second control pin 175 of the assembly 17 moves inward but does not press down the piston rod 15 to move. The oil body 22 in the inner tube 12 will push the piston rod 15 to return to the original maximum stroke (for example, 200mm). After the maximum stroke, the above steps can be performed. The operation of shortening the maximum stroke.

The above "maximum stroke" refers to the displacement stroke of the piston rod 15 driving the piston 16 to move together. When the maximum stroke is adjusted (for example, the adjustment range of the maximum stroke is set to 120-200mm, etc.), the seat cushion will be able to move at the set maximum stroke. Lift and lower within the displacement stroke to adjust the height of the seat cushion. Regarding the operation of lowering the seat cushion, as shown in Figures 9-10, the first control pin 133 of the first control assembly 13 is operated alone to move inward to open the first valve hole 1323 of the first valve body 132, so that the first valve hole 1323 of the first valve body 132 is opened. The oil body 22 in the oil chamber 211 and the oil body 22 in the second oil chamber 24 can communicate. In this state (the second valve hole 1713 of the second valve body 171 is closed by the second sealing part 1753), press down. When the piston rod 15 moves (for example, the seat cushion is pressed down to move the piston rod 15 inward), the oil 22 in the second oil chamber 24 will flow to the first oil chamber 211 of the outer chamber 21 through the first valve hole 1323 and the outer chamber. The gas 23 in the chamber 21 will be under pressure and flow into the inner tube 12 through the notch 144 of the end seat 14, causing the piston 16 and the piston rod 15 to displace together to achieve the effect of adjusting the height of the seat cushion. In the other direction, regarding the operation of raising the seat cushion, as shown in Figures 11-12, the first control pin 133 of the first control assembly 13 is moved inward to open the first valve hole 1323 of the first valve body 132, The oil body 22 in the first oil chamber 211 and the oil body 22 in the second oil chamber 24 can circulate. In this state, if the piston rod 15 is not pressed down (for example, the user leaves the seat cushion), the outer chamber 21 The oil body 22 inside will flow into the second oil chamber 24 and push open the movable ring 134, so that the flow rate of the oil body 22 flowing into the second oil chamber 24 will increase, which can lift the piston rod 15 and together with the piston 16 Displaced towards the end seat 14, the gas 23 in the inner tube 12 will flow into the outer chamber 21 under pressure.

Accordingly, the main technical feature of the lifting device 1 of this invention is that it can adjust the maximum lifting stroke according to needs to apply to bicycle frames of different sizes, thereby increasing the adjustment range of the maximum stroke and reducing the need to make lifting devices with different stroke specifications. Efficacy enhancer.

Figures 13 and 14 show the end seat 14 and the piston 16 of another embodiment of the present invention. In this embodiment, the end seat 14 is composed of an upper part 146 and a lower part 147, and the top of the piston 16 is composed of a first ring 164 with an L-shaped cross section and a second ring with an inverted L-shaped cross section. 165, in addition, the hole wall of the through hole 161 of the piston 16 is not provided with an O-ring.

The above are detailed descriptions and drawings of preferred embodiments of this invention, and are not intended to limit this invention. The entire scope of this invention should be subject to the following patent scope, and the spirit of the patent scope and its similarly modified embodiments and similar structures should be included in this creation.

1:Lifting device

11:Outer tube

111:Top

112: Bottom

12:Inner tube

121:First end

122:Second end

13:First control component

131:Sealing seat

1311: Seat hole

1312:Joint

132:First valve body

1321:bottom

1322:Top

1323:First valve hole

1324:First hole

1325:First valve port

1326:Open your mouth

1327:First sealing ring

1328:O-ring

133:First control pin

1331: First sealing part

1332:First Trail Department

1333:First bevel part

1334:Flange

134:Activity ring

135: Washer

1351:hole

136:Gap

14: End block

141: Binding hole

142:Shoulder

143: Reduced part

144: missing slot

145:O-ring

146: Upper part

147:Lower parts

15:piston rod

151:Inner end

152:Outer end

153:Rod hole

154: Ring groove

155:End

156:O-ring

157: Collar

16:piston

161:Perforation

162:O-ring

163: Positioning ring

164:First ring

165:Second ring

17: Second control component

171:Second valve body

1711:Top

1712:bottom

1713: Second valve hole

1714:Second hole

1715:Connection hole

1716: concave part

1717: Second valve port

1718:hole

172:Bottom tube

1721: Spring seat

1722:orifice

173:Spring

1731:First end

1732:Second end

174:Gasket

1741:Perforation

1742:hole

175: Second control pin

1751: Upper end

1752:bottom

1753:Second sealing part

1754:Second inclined surface

1755:Rim

1756:Spring Room

176:O-ring

177:O-ring

178:Second sealing ring

18:Oil seal assembly

181: Oil seal seat

182:Oil seal

19:Actuator lever

21:Outer chamber

211:First oil chamber

212:Air chamber

22:Oil body

23:Gas

24:Second oil chamber

25:Third oil chamber

Figure 1 is a perspective view of a lifting device according to an embodiment of the present invention.

FIG. 2 is an exploded view of the lifting device of FIG. 1 .

FIG. 3 is an exploded view of the first control component of FIG. 2 .

Figure 4 is an exploded view of the end seat, piston rod, second control assembly, piston and oil seal assembly of Figure 2;

Figure 5 is a cross-sectional view of the lifting device of Figure 1 .

FIG. 6 is a cross-sectional view similar to FIG. 5 , and shows a schematic diagram of simultaneously operating the first control component and the second control component in FIG. 5 .

Figure 7 is an enlarged view of a portion of Figure 6 and shows the flow path of the oil body.

FIG. 8 shows another partial enlarged view of FIG. 6 and shows the flow path of the oil body.

FIG. 9 is a cross-sectional view similar to FIG. 6 , and shows a schematic diagram of operating only the first control component in FIG. 6 .

FIG. 10 is an enlarged view of a part of FIG. 9 and shows the gas flow path when the seat cushion is lowered.

FIG. 11 shows another partial enlarged view of FIG. 9 and shows the oil flow path when the seat cushion is raised.

Figure 12 is a cross-sectional view similar to Figure 10 and shows the path of the gas flow when the seat cushion is raised.

FIG. 13 is an exploded view similar to FIG. 4 , showing the piston and the end seat of another embodiment of the present invention.

FIG. 14 is a partial cross-sectional view of the lifting device according to the embodiment of FIG. 13 .

1: Lifting device

11:Outer tube

111:Top

112: Bottom

12:Inner tube

121:First end

122:Second end

13:First control component

131:Sealing seat

1311: Seat hole

1312:Joint

132:First valve body

1321:bottom

1322:Top

1323:First valve hole

1324:First hole

1327:First sealing ring

1328:O-ring

133:First control pin

1331: First sealing part

1332:First Trail Department

1333:First bevel part

1334:Flange

134:Activity ring

135: Washer

1351:hole

14: End block

141: Binding hole

142:Shoulder

143: Reduced part

144: missing slot

145:O-ring

15:piston rod

151:Inner end

152:Outer end

153:Rod hole

157: Collar

16:piston

161:Perforation

162:O-ring

163: Positioning ring

171:Second valve body

1711:Top

1713: Second valve hole

1717: Second valve port

172:Bottom tube

173:Spring

174:Gasket

175: Second control pin

1753:Second sealing part

178:Second sealing ring

181: Oil seal seat

182:Oil seal

19:Actuator lever

21:Outer chamber

211:First oil chamber

22:Oil body

23:Gas

24:Second oil chamber

25:Third oil chamber

Claims (9)

An adjustable stroke lifting device, including: An outer tube including a top end and a bottom end; An inner tube disposed within the outer tube and including a first end and a second end separated, the first end adjacent to the top end of the outer tube, the second end adjacent to the bottom end of the outer tube, the outer tube and An outer chamber is formed between the inner tubes. The outer chamber can accommodate oil and gas to define a first oil chamber and an air chamber. The interior of the inner tube defines a second chamber that can communicate with the first oil chamber. an oil chamber and a third oil chamber that can communicate with the second oil chamber; A first control component is provided at the bottom end of the outer tube and includes a first valve body and a first control pin. The first valve body is combined in the second end of the inner tube. The first valve body The first valve hole is provided with a first valve hole and at least one first hole. The first hole communicates the first valve hole and the outer chamber. The first control pin movably passes through the first valve of the first valve body. hole and has a first sealing portion, the first sealing portion is openable to seal the first valve hole of the first valve body, so as to control the oil body in the first oil chamber and the oil body in the second oil chamber. Circulation or non-circulation; An end seat, which is installed at the top of the outer tube, and the inside of the end seat is provided with a coupling hole extending along the longitudinal direction of the outer tube to provide the first end of the inner tube for coupling, and the gas in the outer chamber can pass through The end seat flows into the inner tube; A piston rod, which includes an inner end located inside the outer tube and an outer end located outside the outer tube, and the inner end of the piston rod passes through the outer tube and the end seat; A piston located within the inner tube and connected to the piston rod; and A second control component is located in the inner tube and includes a second valve body and a second control pin. The second valve body is combined with the inner end of the piston rod. The second oil chamber in the inner tube Located between the first valve body and the second valve body, the third oil chamber in the inner tube is located between the second valve body and the piston. A second valve hole is provided inside the second valve body. And at least a second hole, the second valve hole is connected to the second oil chamber of the inner tube, the second hole is connected to the second valve hole and the third oil chamber, and the second control pin is movably passed through The second valve hole has a second sealing portion. The second sealing portion can openably close the second valve hole to control the oil in the second oil chamber and the oil in the third oil chamber to be able to circulate. Or not circulating, Wherein, when operating the first control pin of the first control component and the second control pin of the second control component to move to open the first valve hole of the first valve body and the second valve hole of the second valve body , the oil in the first oil chamber and the second oil chamber and the oil in the second oil chamber and the third oil chamber can circulate, so that the total stroke of the piston rod can be adjusted; Wherein, when the first control pin of the first control component is operated alone to move to open the first valve hole of the first valve body, and the second valve hole of the second valve body is closed, the first oil chamber and the third valve hole are closed. The oil body in the second oil chamber is circulated, so that the lifting height of the seat cushion can be adjusted. The adjustable stroke lifting device as claimed in claim 1, wherein the lower section of the second valve hole has a second valve port, and the bottom of the second control pin has the second sealing part and a second inclined part. When When the second sealing portion is at the position of the second valve port, the second valve hole of the second valve body is closed by the second sealing portion. When the second slope portion is at the position of the second valve port, the second valve hole of the second valve body is closed by the second sealing portion. The second valve hole of the second valve body is opened so that the oil body can flow through the second valve hole. The adjustable-stroke lifting device according to claim 2, wherein the lower section of the second valve hole further has a recess, and the second control component further includes a bottom tube, a spring and a gasket, and the bottom tube is installed on There is a spring seat in the lower recess and inside the bottom tube. The first end of the spring is positioned in the spring seat of the bottom tube. The gasket is installed in the second valve port of the second valve hole. The bottom of the second control pin abuts the spring. The adjustable-stroke lifting device according to claim 1, wherein the upper end of the first valve hole forms a first valve port and an opening, a first sealing ring is provided in the first valve port, and a gasket is installed in the opening. , the first control component further includes a movable ring, the bottom of the movable ring is installed in the opening of the first valve body and against the gasket, the upper end of the first sealing part forms a flange, and the flange extends Outside the first valve hole of the first valve body and located within the movable ring, the outer diameter of the flange is slightly smaller than the inner diameter of the movable ring, so that there is a gap between the flange and the movable ring. The adjustable stroke lifting device according to claim 4, wherein the inner end of the first control pin is located in the second end of the inner tube and has a first sealing part, a first small diameter part and is connected to the third A first inclined portion between a sealing portion and the first small diameter portion. When the first sealing portion is at the first valve port, the first valve hole of the first valve body is blocked by the first sealing portion. When the small diameter portion is at the first valve port, the first valve hole of the first valve body is opened so that oil can flow through the first valve hole. The adjustable-stroke lifting device as claimed in claim 1, wherein the inside of the coupling hole of the end base has a shoulder to provide the first end of the inner tube with contact, and a reduced portion is formed in the upper section of the coupling hole , the top of the piston is provided with a positioning ring with an L-shaped cross section. When the piston is located in the first end of the inner tube, the positioning ring is inserted into the reduced part of the coupling hole of the end seat. The adjustable-stroke lifting device as claimed in claim 1, wherein a notch is provided around the outer periphery of the end base, so that the gas in the outer chamber can flow to the inner tube through the notch. The adjustable stroke lifting device according to claim 1, wherein the top of the second valve body has a connecting hole to provide the inner end of the piston rod for coupling, and the outer diameter of the top is smaller than the inner diameter of the inner tube, The inner tube defines the third oil chamber between the second valve body and the piston. The adjustable stroke lifting device as claimed in claim 1, wherein an actuating rod is installed inside the piston rod, the actuating rod can be displaced relative to the piston rod along the longitudinal direction, and the actuating rod is in contact with the second control pin, The second control pin can be moved by the operation of the actuating rod.

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