阅读说明：本技术 一种可单手使用的航天棘轮扳手 (Aerospace ratchet wrench capable of being used with single hand ) 是由 杨佳鑫 傅浩 朱恺旻 郝宏大 王辰星 要瑞凯 师凯 于 2021-09-03 设计创作，主要内容包括：本发明涉及载人航天技术领域,更具体地,涉及一种可单手使用的航天棘轮扳手,包括把手壳体、棘轮装置和加长杆,还包括旋具头导向装置和锁定机构；所述棘轮装置设置在把手壳体上；所述旋具头导向装置和锁定机构分别设置在加长杆的首末两端,所述加长杆通过锁定机构与棘轮装置相连接,本发明公开的可单手使用的航天棘轮扳手,通过将旋具头导向装置和锁定机构分别设置在加长杆的首末两端,锁定机构可以与棘轮装置快速锁定,而加长杆前端的实现棘轮扳手的旋具头导向装置可以实现棘轮装置回轮的操作,能确保空间站航天员在舱外通过单手对螺钉进行安装和拆卸的操作。(The invention relates to the technical field of manned spaceflight, in particular to a spaceflight ratchet wrench capable of being used by one hand, which comprises a handle shell, a ratchet device, an extension bar, a screwdriver head guiding device and a locking mechanism, wherein the screwdriver head guiding device is arranged on the handle shell; the ratchet wheel device is arranged on the handle shell; the invention discloses a spaceflight ratchet wrench capable of being used by one hand, wherein the screwdriver head guiding device and the locking mechanism are respectively arranged at the head end and the tail end of the extension bar, and the extension bar is connected with the ratchet device through the locking mechanism.)

1. The utility model provides a but space flight ratchet spanner that one-hand used, includes handle casing, ratchet and extension bar, its characterized in that: the screwdriver head guide device and the locking mechanism are also included;

the ratchet wheel device is arranged on the handle shell;

the screwdriver head guiding device and the locking mechanism are respectively arranged at the head end and the tail end of the extension bar, and the extension bar is connected with the ratchet wheel device through the locking mechanism.

2. The single-handed aerospace ratchet wrench of claim 1, wherein: the screwdriver head guiding device comprises an upper end baffle ring, a pressure spring, a limiting clamping sleeve, a guiding sleeve and a lower end baffle ring which are sequentially arranged on the extension bar;

the bottom of the extension bar is provided with a key groove;

the limiting clamping sleeve can slide up and down or rotate on the extension bar along the axis direction of the extension bar through the key groove.

3. The single-handed aerospace ratchet wrench of claim 2, wherein: still include the ripple tooth, through ripple tooth intermeshing between spacing cutting ferrule and the guide sleeve.

4. The single-handed aerospace ratchet wrench of claim 2, wherein: an inner hexagonal hole is formed in the guide sleeve.

5. The single-handed aerospace ratchet wrench of claim 1, wherein: the ratchet device comprises a gland, a left pawl, a right pawl, a pagoda spring, a direction knob, a square shaft, a reversing block, a ratchet and a ratchet output shaft connected with the locking mechanism;

the ratchet wheel is arranged in the handle shell, one end of each of the left pawl and the right pawl is meshed with the ratchet wheel, and the other end of each of the left pawl and the right pawl is arranged in the handle shell through a pagoda spring;

the ratchet output shaft is arranged at the bottom of the ratchet;

the direction knob is installed on the gland, the reversing block is connected with the direction knob through the square shaft, and when the direction knob rotates, the reversing block synchronously rotates according to the rotating direction of the direction knob, so that the left pawl or the right pawl close to one side of the steering wheel is opened.

6. The single-handed aerospace ratchet wrench of claim 5, wherein: the ball pushing device also comprises a plunger, a ball pushing spring and a ball pushing spring;

the ratchet wheel output shaft is provided with a mounting through hole;

the plunger is arranged in the mounting through hole, and the ejector bead is pressed on the plunger through the ejector bead spring.

7. The single-handed aerospace ratchet wrench of claim 5, wherein: the ratchet wheel output shaft is provided with a preformed hole, the extension bar is provided with a locking hole, and the preformed hole is matched with the locking hole in position.

8. The single-handed aerospace ratchet wrench of claim 7, wherein: the locking mechanism comprises a pull handle, a pressure plate, a bolt, a flitch plate, a bayonet lock and a spring sleeved outside the bayonet lock;

the pull handle is always in contact with the surface of the flitch, and the pressure plate is arranged on the plug pin;

the pull handle is connected with the bayonet lock through the plug pin, when the locking is needed, the pull handle rotates around the plug pin to control the bayonet lock to axially slide in the locking hole of the lengthening rod and is inserted into the reserved hole of the ratchet wheel output shaft to realize the locking.

9. The single-handed aerospace ratchet wrench of claim 1, wherein: an anti-floating ring is arranged on the handle shell.

10. The single-handed aerospace ratchet wrench of claim 1, wherein: and an anti-skid gripping layer or an anti-skid gripping opening is arranged on the handle shell.

Technical Field

The invention relates to the technical field of manned spaceflight, in particular to a spaceflight ratchet wrench capable of being used by one hand.

Background

According to the requirement of space station astronauts for carrying out extra-cabin maintenance tasks, extra-cabin equipment replacement is related, the equipment and the cabin plate are fixed through non-falling screws arranged at installation corners of the equipment, and installation and disassembly of the screws are routine and necessary operation of extra-cabin work of the astronauts.

In the process of operating the extra-cabin ratchet wrench, the ratchet wrench needs to have the functions of ratchet reciprocation and reversing, the existing ratchet wrench needs the other hand to hold the extension bar body to overcome the torque of the ratchet wheel return wheel, the requirement of one-hand operation cannot be met, if the ratchet wheel return wheel is operated by one hand, the extension bar rotates along with the ratchet wheel while the ratchet wheel returns, the screw is screwed to work inefficiently, and the maintenance tasks of movable disassembly outside the cabin and screw installation cannot be completed.

Accordingly, there is a need for a space ratchet wrench that solves the above problems and can be used with a single hand.

Disclosure of Invention

The invention provides an aerospace ratchet wrench which can be used by a single hand when being installed and detached outside a cabin by an astronaut, so as to overcome at least one defect (deficiency) in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows: a spaceflight ratchet wrench capable of being used by one hand comprises a handle shell, a ratchet device, an extension bar, a screwdriver head guiding device and a locking mechanism;

the ratchet wheel device is arranged on the handle shell;

the screwdriver head guiding device and the locking mechanism are respectively arranged at the head end and the tail end of the extension bar, the extension bar is connected with the ratchet wheel device through the locking mechanism, the screwdriver head guiding device and the locking mechanism are respectively arranged at the head end and the tail end of the extension bar, the locking mechanism can be quickly locked with the ratchet wheel device, the screwdriver head guiding device for realizing the ratchet wrench at the front end of the extension bar can realize the operation of the ratchet wheel device for returning wheels, and the operation that a space station astronaut installs and dismantles the screw by one hand outside a cabin can be ensured.

Furthermore, the screwdriver head guiding device comprises an upper end baffle ring, a pressure spring, a limiting clamping sleeve, a guiding sleeve and a lower end baffle ring which are sequentially arranged on the extension bar;

the bottom of the extension bar is provided with a key groove;

spacing cutting ferrule passes through the keyway and can follow extension bar axis direction and slide from top to bottom or pivoted setting on the extension bar, and spacing cutting ferrule passes through the keyway with the extension bar and is connected, can follow the extension bar and slide from top to bottom again along with extension bar pivoted in, and guide sleeve front end and screw cooperation, guide sleeve remain motionless in the ratchet spanner use, and the pressure spring is installed at spacing clamping sleeve up end, realizes the operation of singlehanded screw-up or unscrewing.

Furthermore, the limiting clamping sleeve is meshed with the guide sleeve through the corrugated teeth under the action of the pressure spring through the corrugated teeth, and the limiting clamping sleeve can rotate relative to the guide sleeve only by overcoming the meshing force of the corrugated teeth.

Furthermore, the guide sleeve is provided with an inner hexagonal hole, fastening components such as screws and the like of equipment outside the cabin can be disassembled and assembled through the arrangement of the inner hexagonal hole, the replacement and the maintenance are convenient, and in practical application, different holes can be arranged on the guide sleeve according to use requirements, and the guide sleeve is within the protection scope of the invention.

Furthermore, the ratchet wheel device comprises a gland, a left pawl, a right pawl, a pagoda spring, a direction knob, a square shaft, a reversing block, a ratchet wheel and a ratchet wheel output shaft connected with the locking mechanism;

the ratchet wheel is arranged in the handle shell, one end of each of the left pawl and the right pawl is meshed with the ratchet wheel, and the other end of each of the left pawl and the right pawl is arranged in the handle shell through a pagoda spring;

the ratchet output shaft is arranged at the bottom of the ratchet;

the direction knob is arranged on the press cover, the reversing block is connected with the direction knob through a square shaft, when the direction knob rotates, the reversing block synchronously rotates according to the rotating direction of the direction knob to open a left pawl or a right pawl close to one side of the steering wheel, when the direction knob is used, the direction knob can be shifted according to operation needs to reverse between two gears of loose and tight, the direction knob is connected with the reversing block through the square shaft to realize synchronous rotation, when the direction knob turns to the tight gear, the reversing block rotates rightwards to open the right pawl, the left pawl is meshed with the ratchet under the action of a pagoda spring, when the handle shell rotates clockwise, the left pawl drives the ratchet to rotate clockwise, when the handle shell rotates anticlockwise, the ratchet keeps still, the left pawl slides over ratchet teeth to realize the reset of the handle shell, when the direction knob turns to the loose gear, the reversing block rotates leftwards to open the left pawl, the right pawl is meshed with the ratchet wheel under the action of the pagoda spring, when the handle shell rotates anticlockwise, the right pawl drives the ratchet wheel to rotate anticlockwise, when the handle shell rotates clockwise, the ratchet wheel keeps still, and the right pawl slides over ratchet wheel teeth to reset the handle shell.

Furthermore, the device also comprises a plunger, a top ball spring and a top ball;

the ratchet wheel output shaft is provided with a mounting through hole;

the plunger is arranged in the mounting through hole, the ejector bead is pressed on the plunger through the ejector bead spring, a detachable ball head elastic plunger structure is formed through the plunger, the ejector bead spring and the ejector bead, and the first float prevention after the handle shell and the extension rod are assembled can be realized.

Furthermore, a preformed hole is formed in the ratchet wheel output shaft, a locking hole is formed in the extension rod, the preformed hole is matched with the locking hole in position, and the locking mechanism is convenient to install and position through the preformed hole and the locking hole.

Furthermore, the locking mechanism comprises a pull handle, a pressure plate, a bolt, a flitch plate, a bayonet lock and a spring sleeved outside the bayonet lock;

the pull handle is always in contact with the surface of the flitch, and the pressure plate is arranged on the plug pin;

the pull handle is connected with the bayonet lock through the bolt, when the pull handle needs to be locked, the pull handle rotates around the bolt, the bayonet lock is controlled to axially slide in the locking hole of the lengthening rod and is inserted into the reserved hole of the ratchet wheel output shaft to achieve locking, the pull handle is pulled to be in a closed state due to the fact that the pull handle is connected with the bayonet lock through the bolt, the bayonet lock can slide inwards along the locking hole and is inserted into the reserved hole in the ratchet wheel output shaft to achieve locking, when the pull handle is pulled to be in an open state, the bayonet lock slides outwards along the locking hole and moves out of the reserved hole in the ratchet wheel output shaft to achieve unlocking.

Furthermore, be equipped with on the handle casing and prevent floating the ring, through preventing floating the setting of ring, can tie up tightly or fix preventing floating the ring through other devices when using, avoid space station astronauts when installation outside the cabin is dismantled, because the hand is smooth and lead to space ratchet spanner to float away under the environment of no gravity.

Furthermore, be equipped with anti-skidding gripping layer or anti-skidding gripping mouth on the handle casing, through the setting of anti-skidding gripping layer or anti-skidding gripping mouth, the space station astronaut of being convenient for can better hold the handle casing, wherein anti-skidding gripping layer can play the effect that increases friction power, and anti-skidding gripping mouth can make the handle casing laminate space station astronaut's hand more, the better handle casing of holding of being convenient for.

Compared with the prior art, the technical scheme of the invention has the beneficial effects that:

according to the spaceflight ratchet wrench capable of being used by one hand, the screwdriver head guiding device and the locking mechanism are respectively arranged at the head end and the tail end of the extension bar, the locking mechanism can be rapidly locked with the ratchet device, the screwdriver head guiding device at the front end of the extension bar for realizing the ratchet wrench can realize the operation of the ratchet device for turning wheels, and the operation that a spaceman in a space station installs and detaches a screw outside a cabin by one hand can be ensured.

Drawings

Fig. 1 is a schematic structural view of a ratchet wrench used by an astronaut with one hand outside a cabin.

Fig. 2 is an exploded view of the screwdriver head guide and the locking mechanism of the present invention respectively provided at the head and the end of the extension bar.

Fig. 3 is an exploded view of the ratchet device of the present invention mounted on a handle housing.

In the figure, 1 is a handle shell, 2 is a ratchet device, 3 is an extension bar, 4 is a screwdriver head guide device, 5 is a locking mechanism, 6 is an upper end baffle ring, 7 is a pressure spring, 8 is a limit cutting sleeve, 9 is a guide sleeve, 10 is a lower end baffle ring, 11 is a key groove, 12 is a corrugated tooth, 13 is an inner hexagonal hole, 14 is a gland, 15 is a left pawl, 16 is a right pawl, 17 is a pagoda spring, 18 is a direction knob, 19 is a square shaft, 20 is a reversing block, 21 is a ratchet, 22 is a ratchet output shaft, 23 is a plunger, 24 is a ball-ejecting spring, 25 is a ball ejecting, 26 is an installation through hole, 27 is a reserved hole, 28 is a locking hole, 29 is a pull handle, 30 is a pressure plate, 31 is a bolt, 32 is a patch plate, 33 is a bayonet lock, 34 is a spring, 35 is an anti-floating ring, and 36 is an anti-skid gripping layer.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

As mentioned in the background art, the space station astronaut carries out the extravehicular maintenance task, and the extravehicular equipment replacement is related to, and the equipment and the deck plate are realized through the internal screw installed at the equipment installation corner, wherein the installation and the disassembly of the screw are the routine and necessary operation of extravehicular work of the astronaut, and the stability of the astronaut in the operation process is ensured by considering the shaking of the tail end of the station mechanical arm of the astronaut, and the ratchet wrench tool needs to be held by one hand and the fixed handle outside the cabin is held by the other hand, and the ratchet wrench needs to be used by the single hand of the astronaut, so that higher requirements are provided for the ratchet wrench tool used by the astronaut in the extravehicular activity.

The basic idea of the invention is to realize the anti-slip gripping of the astronaut and the forward and reverse rotation of the internal ratchet wheel by lifting a handle shell, realize the quick locking of a locking mechanism of the extension bar and a handle assembly, realize the ratchet wheel return wheel by a screwdriver head guide device at the front end of the extension bar and meet the single-hand operation requirement of the ratchet wheel wrench.

As shown in fig. 1, the aerospace ratchet wrench capable of being used by one hand comprises a handle shell 1, a ratchet device 2, an extension bar 3, a screwdriver head guiding device 4 and a locking mechanism 5; the ratchet wheel device 2 is arranged on the handle shell 1; first guider 4 of screwdriver and locking mechanical system 5 set up respectively at the first end both ends of extension bar 3, extension bar 3 is connected with ratchet 2 through locking mechanical system 5, through setting up first both ends at extension bar 3 respectively with first guider 4 of screwdriver and locking mechanical system 5, locking mechanical system 5 can lock with ratchet 2 fast, and the first guider 4 of screwdriver of realization ratchet spanner of extension bar 3 front end can realize the operation of 2 rounds of ratchet, can ensure that space station astronaut carries out the operation of installation and dismantlement through the one hand outside the cabin to the screw.

As shown in fig. 2, the screwdriver head guiding device 4 comprises an upper end baffle ring 6, a pressure spring 7, a limiting cutting sleeve 8, a guiding sleeve 9 and a lower end baffle ring 10 which are sequentially arranged on the extension bar 3; the bottom of the extension bar 3 is provided with a key slot 11; the limiting clamping sleeve 8 can slide up and down or rotate along the axial direction of the extension bar 3 through a key groove 11 and is arranged on the extension bar 3, the limiting clamping sleeve 8 is connected with the extension bar 3 through the key groove 11, the limiting clamping sleeve can slide up and down along the extension bar 3 while rotating along with the extension bar 3, the front end of the guide sleeve 9 is matched with a screw, the guide sleeve 9 is kept still when the ratchet wrench is used, the pressure spring 7 is arranged on the upper end surface of the limiting clamping sleeve 8 to realize the operation of screwing or unscrewing by one hand, in addition, the ratchet wrench also comprises corrugated teeth 12, the limiting clamping sleeve 8 is meshed with the guide sleeve 9 through the corrugated teeth 12, the limiting clamping sleeve 8 can realize the relative rotation with the guide sleeve 9 only by overcoming the meshing force of the corrugated teeth 12 under the action of the pressure spring 7, an inner hexagonal hole 13 is arranged on the guide sleeve 9, through the arrangement of the inner hexagonal hole 13, fastening components such as screws and the like of equipment outside the cabin can be disassembled and assembled, so that the replacement and the maintenance are convenient, and in practical application, different holes can be arranged on the guide sleeve 9 according to the use requirement, and the invention is within the protection scope.

As shown in fig. 3, the ratchet device 2 comprises a gland 14, a left pawl 15, a right pawl 16, a pagoda spring 17, a direction knob 18, a square shaft 19, a reversing block 20, a ratchet 21 and a ratchet output shaft 22 connected with the locking mechanism 5; the ratchet wheel 21 is arranged in the handle shell 1, one end of each of the left pawl 15 and the right pawl 16 is meshed with the ratchet wheel 21, and the other end of each of the left pawl and the right pawl is arranged in the handle shell 1 through the pagoda spring 17; the ratchet output shaft 22 is arranged at the bottom of the ratchet 21; the direction knob 18 is arranged on the gland 14, the reversing block 20 is connected with the direction knob 18 through a square shaft 19, when the direction knob 18 rotates, the reversing block 20 synchronously rotates according to the rotating direction of the direction knob to open the left pawl 15 or the right pawl 16 close to one side of the steering direction, when the direction knob is used, the direction knob can be turned according to the operation requirement to reverse between two gears of loosening and tightening, the direction knob 18 is connected with the reversing block 20 through the square shaft 19 to realize synchronous rotation, when the direction knob 18 rotates to the tightening gear, the reversing block 20 rotates rightwards to open the right pawl 16, the left pawl 15 is meshed with the ratchet wheel 21 under the action of the pagoda spring 17, when the handle shell 1 rotates clockwise, the left pawl 15 drives the ratchet wheel 21 to rotate clockwise, when the handle shell 1 rotates anticlockwise, the ratchet wheel 21 keeps still, the left pawl 15 slides over the ratchet wheel teeth to realize the reset of the handle shell 1, when the direction knob 18 turns to a loose gear, the reversing block 20 turns left to open the left pawl 15, the right pawl 16 is meshed with the ratchet wheel 21 under the action of the pagoda spring 17, when the handle shell 1 rotates anticlockwise, the right pawl 16 drives the ratchet wheel 21 to rotate anticlockwise, when the handle shell 1 rotates clockwise, the ratchet wheel 21 keeps still, the right pawl 16 slides over ratchet wheel teeth to reset the handle shell 1, and in addition, the handle shell also comprises a plunger 23, a bead-ejecting spring 24 and a bead-ejecting spring 25; the ratchet output shaft 22 is provided with a mounting through hole 26; plunger 23 sets up in installation through-hole 26, the fore-set 25 is through fore-set spring 24 pressfitting on plunger 23, through plunger 23, the setting of fore-set spring 24 and fore-set 25, a detachable bulb elasticity plunger structure has been formed, can realize that handle housing 2 prevents for the first time after 3 assembles of extension bar is floated, in addition, be equipped with preformed hole 27 on ratchet output shaft 22, be equipped with locking hole 28 on the extension bar 3, the position phase-match of preformed hole 27 and locking hole 28, through the setting of preformed hole 27 and locking hole 28, be convenient for locking mechanical system 5's installation and location.

In the invention, the locking mechanism 5 comprises a pull handle 29, a pressure plate 30, a bolt 31, a flitch plate 32, a bayonet 33 and a spring 34 sleeved outside the bayonet 33; the pull handle 29 is always kept in contact with the surface of the flitch plate 32, and the pressing plate 30 is arranged on the bolt 31; the pull handle 29 is connected with the bayonet 33 through the bolt 31, when the locking is needed, the pull handle 29 rotates around the bolt 31, the bayonet 33 is controlled to axially slide in the locking hole 28 of the extension bar 3 and is inserted into the preformed hole 27 of the ratchet output shaft 22 to realize the locking, because the pull handle 29 is connected with the bayonet 33 through the bolt 31, the pull handle 29 is shifted to the closed state, the bayonet 33 can slide inwards along the locking hole 28 and is inserted into the preformed hole 27 on the ratchet output shaft 22 to realize the locking, when the pull handle 29 is shifted to the open state, the bayonet 33 slides outwards along the locking hole 28 and is moved out from the preformed hole 27 on the ratchet output shaft 22 to realize the unlocking, wherein, the anti-floating ring 35 is arranged on the handle shell 1, the anti-floating ring 35 can be bound or fixed through other devices when in use, so that a space station astronaut is prevented from being installed and detached outside a cabin, because the hand is smooth and lead to space ratchet spanner to float away under the environment of gravity-free, and be equipped with anti-skidding gripping layer 36 or anti-skidding gripping mouth on handle casing 1, through the setting of anti-skidding gripping layer 6 or anti-skidding gripping mouth, the space station astronaut of being convenient for can better hold handle casing 1, wherein anti-skidding gripping layer 36 can play the effect of increasing friction power, and anti-skidding gripping mouth can make handle casing 1 more laminate space station astronaut's hand, be convenient for better hold handle casing 1.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

When the handle is used, when the screw is screwed down, the handle shell rotates clockwise, the ratchet rotates clockwise under the action of the left pawl, the limiting clamping sleeve overcomes the meshing force and rotates clockwise along with the extension bar, the ratchet wrench effectively acts on the screw, the handle shell rotates anticlockwise, the ratchet needs to overcome the defect that the left pawl scratches the rotation torque generated by the ratchet teeth and can keep non-rotation, when the rotation torque generated by the ratchet is smaller than the meshing force required by the rotation of the limiting clamping sleeve, the limiting clamping sleeve does not generate relative motion, the extension bar does not rotate, the ratchet keeps non-rotation, the handle shell completes resetting anticlockwise, and the single-hand screwing operation is realized.

When the screw is unscrewed, the handle shell rotates anticlockwise, the ratchet rotates anticlockwise under the action of the right pawl, the limiting clamping sleeve overcomes the meshing force and rotates anticlockwise along with the lengthening rod, the ratchet wrench effectively applies work to the screw, the handle shell rotates clockwise, the ratchet needs to overcome the rotating torque generated by the right pawl to the ratchet after scratching the ratchet teeth, when the rotating torque generated to the ratchet is smaller than the meshing force required by the rotation of the limiting clamping sleeve, the limiting clamping sleeve does not generate relative motion, the lengthening rod does not rotate, the ratchet keeps not rotating, the handle shell completes resetting clockwise, and the single-hand unscrewing operation is realized.

In the drawings, the positional relationship is described for illustrative purposes only and is not to be construed as limiting the present patent; it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.