CN115031077A - Quick connecting device of double-locking device - Google Patents

Abstract

The invention discloses a quick connecting device of double locking devices, which comprises a connecting sleeve inserted with a male plug, wherein a locking device and a locking clamping sleeve connected with the locking device are arranged in the connecting sleeve, the locking device comprises a push plate, a first clamping strip and a second clamping strip are arranged at the upper end of the push plate, a first limiting block and a second limiting block are arranged between the two clamping strips, and a first positioning rod and a second positioning rod are arranged at the lower end of the push plate. According to the invention, the locking device and the locking clamping sleeve are arranged on the connecting sleeve, so that the male plug is protected from being fixed, the male plug can be automatically locked, the installation state can be conveniently observed, the situation of installation falling off is avoided, the structure is simple, and the assembly and disassembly are convenient.

Description

Quick connecting device of double-locking device

Technical Field

The invention relates to the field of automobile part manufacturing, in particular to a quick connecting device of double locking devices.

Background

At present, the quick connecting device widely used in automobile fuel and new energy pipeline system mainly adopts single locking mechanism, generally, single locking mechanism connecting device does not have the functions of automatic locking and check error prevention in the assembling process, and the safety is poor, single locking mechanism connecting device is unlocked under the action of external force (vibration, flying stones and the like) in the working process, so that the risk of pipeline system leakage is high, and single locking mechanism connecting device does not have the functions of automatic locking and error prevention in the assembling process, so that the problem of driving safety influence caused by the fact that the installation is not in place is easily caused.

Disclosure of Invention

The invention aims to provide a quick connecting device of double locking devices, which is convenient to disassemble and assemble and is convenient to check the installation state.

The technical scheme of the invention is as follows:

a quick connecting device of double locking devices comprises a connecting sleeve inserted with a male plug, wherein a notch is arranged on one side of the connecting sleeve, a locking device is arranged on the connecting sleeve, a first cavity, a second cavity and a third cavity are sequentially arranged in the connecting sleeve from top to bottom, a locking sleeve connected with the locking device is clamped in the third cavity, an inserting hole is formed in one side in the first cavity, a limiting hole is formed in the other side of the first cavity, a notch groove is formed in the bottom of the first cavity, an installing hole is formed in one side of the second cavity, a abdicating hole is formed in the other side of the second cavity, a guide block is arranged at a position corresponding to the installing hole in the second cavity, and a positioning lug is arranged on one side corresponding to the abdicating hole; the locking ware is including the push pedal that is equipped with the guiding hole the upper end of push pedal is equipped with first card strip and second card strip, two be equipped with first stopper and second stopper between the card strip, the lower extreme of this push pedal is equipped with first locating lever and second locating lever, two in the card strip all stretches into first cavity, and the corresponding position on every card strip stretches into the spacing hole that corresponds the end, two in locating lever and the stopper all stretch into the second cavity, correspond the position on two locating levers and correspond the locating lug joint location of end.

By adopting the structure, when the locking device is inserted into the connecting sleeve, the first positioning rod and the second positioning rod are inserted from the mounting hole, then the first limiting block and the second limiting block are also inserted into the second cavity from the mounting hole, the first clamping strip and the second clamping strip are inserted into the first cavity from the insertion hole, and the corresponding positions on the clamping strips extend into the limiting holes at the corresponding ends to prevent the locking device from falling off; after the male plug is inserted, the boss on the male plug moves from top to bottom and extrudes corresponding positions on the two positioning rods, the two positioning rods are opened along the same trend, after the male plug is inserted in place, the two positioning rods move back and move along the outer side surface of the male plug at the same time, the corresponding positions on the limiting blocks are attached to the outer side wall of the male plug and the corresponding positions of the boss for limiting, the corresponding positions on the two positioning rods are clamped and positioned with the positioning lugs at the corresponding ends, and the functions of automatic locking and mistake proofing are realized; meanwhile, the locking clamping sleeve is clamped and fixed with the third cavity and is attached to the locker, so that the situation that the male plug is installed in place can be judged while the locker is prevented from falling off; if the male plug is not installed in place, one condition is that the locking device is loosened and the locking clamping sleeve cannot be clamped in place when the two positioning rods are in an open state compared with the initial position in the two limiting holes, and the other condition is that the boss of the male plug steps over the positions of the positioning rods but the positioning rods are not clamped in place, the two positioning rods can be seen to be outwards opened from the outside of the connecting sleeve, namely the male plug is loosened and the locking clamping sleeve cannot be clamped in place, and the positions of the two limiting holes are convenient for checking the installation state; when the male plug is disassembled, the clamped locking clamping sleeve is pulled out from the third cavity, then the two positioning rods are directly pulled out from the disassembling hole, so that the positioning rods are separated from the positioning lugs, then the boss position of the male plug is pulled out of the positioning rods, and finally the two positioning rods are loosened.

In order to simplify the structure, preferably, two limiting holes are symmetrically arranged on the left side and the right side of the middle part of the first cavity.

In order to simplify the structure and facilitate limiting, preferably, the first clamping strip and the second clamping strip horizontally extend out of the upper end of the push plate, two stop blocks are symmetrically arranged on the two clamping strips, and the two stop blocks extend into the limiting holes at the corresponding ends.

In order to improve the stress strength, preferably, a first fixed block and a second fixed block are symmetrically arranged on the left and right sides of the position, corresponding to the position between the two clamping strips, of the push plate, a first limiting block extending horizontally is arranged at the lower end of the first fixed block, a second limiting block extending horizontally is arranged at the lower end of the second fixed block, the end faces of the extending ends of the two limiting blocks are respectively provided with a section of arc surface, and the two sections of arc surfaces form a semi-arc shape; the lower end faces of the first limiting block and the second limiting block are respectively provided with a section of extension section extending downwards, and each extension section is provided with a section of cambered surface section corresponding to the extending direction of the limiting block; and reinforcing blocks are arranged between the fixed blocks and the limiting blocks at the corresponding ends.

In order to improve the installation stability, preferably, the upper end surfaces of the two limiting blocks are flush with the upper end surfaces of the two positioning rods.

In order to better ensure the convenience of disassembly and assembly, as the optimization, the fixed block, the limiting block and the extension section at the corresponding ends are provided with grooves which penetrate up and down, and the grooves at the two ends are symmetrically arranged and form a notch structure in a surrounding manner; the position department that the chamber bottom of first cavity and second cavity corresponds the breach structure all is equipped with one and steps down the groove, two it all communicates with the breach structure to step down the groove.

In order to simplify the structure, preferably, the first positioning rod and the second positioning rod horizontally extend out from the lower end of the push plate, the extending end of each positioning rod is provided with a bending section, each positioning rod is provided with a lug, the upper end surface of each lug is provided with a transition inclined plane, and the bending section, the lug and the corresponding position of the positioning rod at the corresponding end surround to form a clamping groove; the second cavity is internally provided with a connecting block, the connecting block is symmetrically provided with two positioning lugs at the left and right sides, and the clamping groove at the corresponding end is clamped and positioned with the positioning lugs.

In order to realize automatic sliding and locking in place, preferably, the outer side wall of each lug comprises a first inclined straight section, the highest end of the first inclined straight section is connected with a second inclined straight section, the lowest end of the second inclined straight section is connected with an arc section, and the lowest end of the arc section is connected with the corresponding position of the inner side wall of the corresponding end positioning rod.

In order to simplify the structure and facilitate installation and orientation, preferably, a limiting boss is arranged in the third cavity, a transition hole for penetrating the male plug is formed in the limiting boss, two first clamping convex blocks and two second clamping convex blocks are symmetrically arranged on the limiting boss, and the outer wall of the limiting boss and the first clamping convex blocks and the second clamping convex blocks at the corresponding ends are encircled to form a limiting clamping groove; the locking clamping sleeve comprises a limiting plate and two connecting plates arranged on the limiting plate, a bending section is arranged at the edge of the limiting plate, a guide rod is arranged at the position, corresponding to the guide hole, on the limiting plate, and a clamping block is arranged on each connecting plate; during the use, promote the limiting plate, make the guide bar stretch into in the guiding hole to the top that makes the income end of stretching of guide bar be located the boss of male plug realizes the spacing to the male plug, still drives the connecting plate simultaneously and removes, the fixture block that corresponds the end shift out spacing draw-in groove and with the outside butt location of first joint lug, and the bending segment then synchronous movement and with the outer wall butt of adapter sleeve breach position, and the lateral wall of limiting plate flushes with the outer wall of adapter sleeve.

In order to facilitate the insertion and the movement of the connecting plate to be smoother, preferably, a first abdicating inclined plane is arranged on the groove wall corresponding to one side of the first clamping convex block in the limiting clamping groove, and a second abdicating inclined plane is arranged on the groove wall corresponding to one side of the second clamping convex block in the limiting clamping groove.

Has the advantages that: according to the invention, the locking device and the locking clamping sleeve are arranged on the connecting sleeve, so that the male plug is protected from being fixed, the male plug can be automatically locked, the installation state can be conveniently observed, the situation of installation falling off is avoided, the structure is simple, and the disassembly and the assembly are convenient.

Drawings

Fig. 1 is an exploded view of the installation of the present invention.

Fig. 2 is a schematic structural diagram of the first cavity.

Fig. 3 is a schematic structural view of the second cavity.

Fig. 4 is a schematic structural view of the third cavity.

Fig. 5 is a schematic structural view of the locker.

Fig. 6 is a bottom view of fig. 5.

Fig. 7 is a top view of fig. 5.

Fig. 8 is a sectional view taken along line a-a in fig. 7.

Fig. 9 is a schematic structural view of a locking ferrule.

Fig. 10 is a schematic view of the installation process of the first cavity and the second cavity.

Fig. 11 is a schematic view of the installation process of the third cavity.

Fig. 12 is a schematic structural diagram of the use state of the present invention.

Fig. 13 is a schematic view of the mounting structure of the present invention.

Fig. 14 is a bottom view of fig. 13.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1 to 14, the invention comprises a connecting sleeve 1 inserted with a male plug, a locking device is arranged in the connecting sleeve 1, a first cavity 11, a second cavity 12 and a third cavity 15 are sequentially arranged in the connecting sleeve 1 from top to bottom, an inserting hole 21 is arranged at one side in the first cavity 11, two limiting holes 23 are symmetrically arranged at the left side and the right side of the middle part of the first cavity 11, a notch groove is arranged at the bottom of the first cavity 11,

a mounting hole 121 is formed in one side of the second cavity 12, an abdicating hole 122 is formed in the other side of the second cavity 12, a guide block 22 is arranged in the second cavity 12 at a position corresponding to the mounting hole 121, and a positioning bump 13 is arranged at one side corresponding to the abdicating hole 122;

the locking device comprises a push plate 3, a first clamping strip 31 and a second clamping strip 32 which horizontally extend out are arranged at the upper end of the push plate 3, two stop blocks 33 are symmetrically arranged on the two clamping strips, the two stop blocks 33 extend into the limiting holes 23 of the corresponding ends, and the locking device is prevented from falling off.

A first fixed block 441 and a second fixed block 442 are symmetrically arranged on the push plate 3 at the left and right sides corresponding to the position between the two clamping strips, a first limiting block 41 horizontally extending out is arranged at the lower end of the first fixed block 441, a second limiting block 42 horizontally extending out is arranged at the lower end of the second fixed block 442, the end surfaces of the extending ends of the two limiting blocks are respectively provided with a section of arc surface, and the two sections of arc surfaces form a semi-arc shape; the lower end surfaces of the first limiting block 41 and the second limiting block 42 are respectively provided with a section of extension section 55 extending downwards, and each extension section 55 is provided with a section of cambered surface corresponding to the extending direction of the limiting block; reinforcing blocks 45 are arranged between the fixing blocks and the limiting blocks at the corresponding ends.

The upper end faces of the two limiting blocks are flush with the upper end faces of the two positioning rods.

The fixed block, the limiting block and the extension section at the corresponding ends are provided with grooves which penetrate up and down, and the grooves at the two ends are symmetrically arranged and surround to form a notch structure; the cavity bottom of the first cavity 11 and the second cavity 12 is provided with a yielding groove 14 corresponding to the notch structure, and the yielding grooves 14 are communicated with the notch structure.

The lower end of the push plate 3 is provided with a first positioning rod 51 and a second positioning rod 52 which horizontally extend, the extending end of each positioning rod is provided with a bending section 53, each positioning rod is provided with a lug, the upper end surface of each lug is provided with a transition inclined plane 541, and the corresponding positions of the bending section 53, the lug and the positioning rod at the corresponding end surround to form a clamping groove; and a connecting block is arranged in the second cavity 12, two positioning convex blocks 13 are symmetrically arranged on the left and right sides of the connecting block, and the clamping grooves at the corresponding ends are clamped and positioned with the positioning convex blocks 13.

Every the lateral wall of lug all includes first oblique straight section 542's the highest end is connected with the oblique straight section 543 of second the lowest end of the oblique straight section 543 of second is connected with circular arc section 544, and this circular arc section 544's the lowest end is connected with the corresponding position of the inside wall that corresponds the end locating lever.

A limit boss 151 is arranged in the third cavity 15, a transition hole 152 for penetrating a male plug is arranged on the limit boss 151, two first clamping convex blocks 161 and two second clamping convex blocks 162 are symmetrically arranged on the limit boss 151, and the outer wall of the limit boss 151 and the first clamping convex blocks 161 and the second clamping convex blocks 162 at the corresponding ends are encircled to form a limit clamping groove 163; the locking clamping sleeve comprises a limiting plate 61 and two connecting plates 63 arranged on the limiting plate 61, a bending section 611 is arranged at the edge of the limiting plate 61, a guide rod 611 is arranged at the position, corresponding to the guide hole 30, of the limiting plate 61, and a clamping block 64 is arranged on each connecting plate 63.

During the use, promote limiting plate 61, make guide bar 611 stretch into in the guiding hole 30, and make the top that the end that stretches into of guide bar 611 is located the boss of male plug realize the spacing to the male plug, still drive connecting plate 63 simultaneously and remove, the fixture block 64 that corresponds the end shifts out spacing draw-in groove 163 and fixes a position with the outside butt of first joint lug 161, and bending segment 611 then synchronous movement and with the outer wall butt of adapter sleeve 1 breach position, and the lateral wall of limiting plate 61 flushes with the outer wall of adapter sleeve 1.

A first abdicating inclined plane 171 is arranged on the groove wall corresponding to one side of the first clamping convex block 161 in the limiting clamping groove 163, and a second abdicating inclined plane 172 is arranged on the groove wall corresponding to one side of the second clamping convex block 162 in the limiting clamping groove 163.

The using method of the invention is as follows:

as shown in fig. 1 to 12, when the locking device is inserted into the connecting sleeve 1, the first positioning rod 51 and the second positioning rod 52 are inserted from the position of the mounting hole 121, then the first limiting block 41 and the second limiting block 42 are also inserted into the second cavity 12 from the position of the mounting hole 121, the first clamping strip 31 and the second clamping strip 32 are then inserted into the first cavity 11 from the position of the insertion hole 21, the stoppers 33 on the two clamping strips respectively extend into the limiting holes 23 at the corresponding ends, and the stoppers 33 abut against the hole walls of the limiting holes 23 to prevent the locking device from falling off.

After the male plug is inserted, the boss on the male plug moves from top to bottom and simultaneously extrudes the transition inclined planes 541 on the two lugs, the first positioning rod 51 and the second positioning rod 52 move along and form an opening shape, after the male plug is inserted in place, namely, the boss position of the male plug moves downwards to be away from the transition inclined plane 541 position, the second inclined straight section 543 of the outer side wall of the lug is attached to the outer side wall of the male plug while the two positioning rods move back, and moves along the outer side surface of the male plug, and the clamping groove at the corresponding end of the positioning rod is clamped and fixed with the positioning lug 13, the arc section 544 is attached to the outer side wall of the male plug, simultaneously, first stopper (41 and second stopper 42 move to the top of boss, and the arc surface that two stoppers stretched out the end laminates with the corresponding position of the positive plug lateral wall above the boss, and the cambered surface section on the extension section 55 then laminates with the lateral wall of boss, realizes the function of automatic locking and mistake proofing.

Finally, the limiting plate 61 is pushed, the guide rod 611 extends into the guide hole 30, the extending end of the guide rod 611 is located above the boss of the male plug to limit the male plug, the connecting plate 63 is driven to move, the fixture block 64 at the corresponding end moves out of the limiting clamp slot 163 and is abutted against the outer side of the first clamping projection 161 for positioning, the bending section 612 moves synchronously and is abutted against the outer wall of the gap position of the connecting sleeve 1, and the outer side wall of the limiting plate 61 is flush with the outer wall of the connecting sleeve 1; the first abdicating inclined plane 171 and the second abdicating inclined plane 171 are beneficial to the oblique movement and the opening of the clamping block 64, and are beneficial to the smooth movement of the connecting plate 63.

If the male plug is not installed in place, in one case, when the two positioning rods are in an open state in comparison with the initial positions in the two limiting holes, the locking device is loosened, and the clamping block 64 cannot be clamped in place; the other situation is that the boss of the male plug steps over the position of the positioning rod, but the positioning rod and the positioning lug 13 are not clamped in place, so that the two positioning rods can be seen to be outwards opened from the position of the dismounting hole 122 of the connecting sleeve 1, namely, the male plug is loose, the clamping block 64 still cannot be clamped in place, the positions of the two limiting holes 23 are also convenient for checking the installation state, and the locking device is prevented from being loosened and sliding off so as to replace the male plug in time.

As shown in fig. 10 and 11, during disassembly, the latch blocks 64 at both ends are pulled open at the position of the third cavity 15, the limiting plate 61 is pulled out, the latch blocks 64 move into the limiting latch slots 163, meanwhile, the guide rod 611 leaves above the boss position of the male plug, then the two positioning rods are pulled open directly from the position of the disassembly hole 122, the positioning rods leave the positioning lugs 13, the boss position of the male plug is pulled out of the positioning rod position, and finally the two positioning rods are loosened, so that the structure is simple and compact, and the whole disassembly and assembly process is simple and rapid.

It should be noted that, as shown in fig. 3, fig. 5, fig. 6, fig. 13, fig. 14 and e of fig. 10, the fixing block, the limiting block and the extending section at the corresponding end are provided with grooves which penetrate up and down, the grooves at the two ends are symmetrically arranged and form a gap structure in a surrounding manner, when the pushing plate 3 is pushed to the right position during installation, the abdicating groove 14 is communicated with the gap structure, if the positioning rod is pulled to the right position, a related auxiliary tool can be inserted into the communicated position to assist in pulling the locking device to assist in detachment, and the related parts can be replaced conveniently.

In addition, set up first oblique straight section 542 and help the draw-in groove joint location on the locating lever on the one hand, on the other hand is then with the inclined plane form reduction area of contact to reduce the dismantlement resistance.

In order to ensure the use strength and the elastic requirements of assembly and disassembly, the locking device is integrally formed by injection molding of a nylon 66 material, which is the prior art and is not described in detail herein.

Claims (10)

1. The utility model provides a quick connecting device of two locking device, is including inserting adapter sleeve (1) that is equipped with the male plug, its characterized in that: a notch is formed in one side of the connecting sleeve (1), a locking device is arranged on the connecting sleeve (1), a first cavity (11), a second cavity (12) and a third cavity (15) are sequentially arranged in the connecting sleeve (1) from top to bottom, a locking clamping sleeve (6) connected with the locking device is clamped in the third cavity (15), an inserting hole (21) is formed in one side of the first cavity (11), a limiting hole (23) is formed in the other side of the first cavity, a notch groove is formed in the cavity bottom of the first cavity (11), a mounting hole (121) is formed in one side of the second cavity (12), a yielding hole (122) is formed in the other side of the second cavity (12), a guide block (22) is arranged in the position corresponding to the mounting hole (121), and a positioning lug (13) is arranged in one side corresponding to the yielding hole (122); the locking ware is including push pedal (3) that is equipped with guiding hole (30) the upper end of push pedal (3) is equipped with first card strip (31) and second card strip (32), two be equipped with first stopper (41) and second stopper (42) between the card strip, and the lower extreme of this push pedal (3) is equipped with first locating lever (51) and second locating lever (52), two in the card strip all stretches into first cavity (11), and the corresponding position on every card strip stretches into spacing hole (23) of corresponding end, two in locating lever and the stopper all stretched into second cavity (12), the location of corresponding position and the locating lug (13) joint of corresponding end on two locating levers.

2. The quick connect device of double lock according to claim 1, characterized in that: two limiting holes (23) are symmetrically arranged on the left side and the right side of the middle part of the first cavity (11).

3. The quick-connect coupling of double lock as claimed in claim 2, wherein: first card strip (31) and second card strip (32) equal level stretch out the upper end of push pedal (3) two card strip go up the symmetry and are equipped with two dog (33), two dog (33) stretch into spacing hole (23) of corresponding end.

4. The quick connect device of double lock according to claim 1, characterized in that: a first fixing block (441) and a second fixing block (442) are symmetrically arranged on the left and right of the push plate (3) corresponding to the position between the two clamping strips, a first limiting block (41) which horizontally extends out is arranged at the lower end of the first fixing block (441), a second limiting block (42) which horizontally extends out is arranged at the lower end of the second fixing block (442), the end surfaces of the extending ends of the two limiting blocks are respectively provided with a section of arc surface, and the two sections of arc surfaces form a semi-arc shape; the lower end faces of the first limiting block (41) and the second limiting block (42) are respectively provided with a section of extension section (55) extending downwards, and each extension section (55) is provided with a section of cambered surface section corresponding to the extending direction of the limiting block; and reinforcing blocks (45) are arranged between the fixed blocks and the limiting blocks at the corresponding ends.

5. The quick connect device of double lock according to claim 4, characterized in that: the upper end faces of the two limiting blocks are flush with the upper end faces of the two positioning rods.

6. The quick connect device of double lock according to claim 4, characterized in that: the fixed block, the limiting block and the extension section at the corresponding ends are provided with grooves which penetrate up and down, and the grooves at the two ends are symmetrically arranged and surround to form a notch structure; the position department that corresponds the breach structure at the bottom of the chamber of second cavity (12) all is equipped with one and steps down groove (14), two it all communicates with the breach structure to step down groove (14).

7. The quick-connect device of double lock according to claim 1, characterized in that: the first positioning rod (51) and the second positioning rod (52) horizontally extend out from the lower end of the push plate (3), a bending section (53) is arranged at the extending end of each positioning rod, a bump is arranged on each positioning rod, a transition inclined plane (541) is arranged on the upper end surface of each bump, and the bending section (53), the bump and the corresponding position of the positioning rod at the corresponding end surround to form a clamping groove; the connecting block is arranged in the second cavity (12), the left side and the right side of the connecting block are symmetrically provided with two positioning convex blocks (13), and the clamping grooves at the corresponding ends are clamped and positioned with the positioning convex blocks (13).

8. The quick connect device of double lock according to claim 7, characterized in that: every the lateral wall of lug all includes first oblique straight section (542) the highest end of first oblique straight section (542) is connected with oblique straight section of second (543), the least significant end of second oblique straight section (543) is connected with circular arc section (544), and the least significant end of this circular arc section (544) is connected with the corresponding position of the inside wall that corresponds the end locating lever.

9. The quick connect device of double lock according to claim 1, characterized in that: a limiting boss (151) is arranged in the third cavity (15), a transition hole (152) for penetrating a male plug is formed in the limiting boss (151), two first clamping convex blocks (161) and two second clamping convex blocks (162) are symmetrically arranged on the limiting boss (151), and the outer wall of the limiting boss (151) and the first clamping convex blocks (161) and the second clamping convex blocks (162) at the corresponding ends are encircled to form a limiting clamping groove (163); the locking cutting sleeve comprises a limiting plate (61) and two connecting plates (63) arranged on the limiting plate (61), a bending section (611) is arranged at the edge of the limiting plate (61), a guide rod (611) is arranged at the position, corresponding to the guide hole (30), on the limiting plate (61), and a clamping block (64) is arranged on each connecting plate (63); during the use, promote limiting plate (61), make guide bar (611) stretch into guiding hole (30), and make the top that the end that stretches into that guide bar (611) is located the boss of male plug realize the spacing to the male plug, still drive connecting plate (63) simultaneously and remove, fixture block (64) that corresponds the end shift out spacing draw-in groove (163) and with the outside butt location of first joint lug (161), and bending section (611) then synchronous movement and with the outer wall butt of adapter sleeve (1) breach position, and the lateral wall of limiting plate (61) flushes with the outer wall of adapter sleeve (1).

10. The quick connect device of double lock according to claim 9, characterized in that: the groove wall corresponding to one side of the first clamping convex block (161) in the limiting clamping groove (163) is provided with a first abdicating inclined plane (171), and the groove wall corresponding to one side of the second clamping convex block (162) in the limiting clamping groove (163) is provided with a second abdicating inclined plane (172).

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