GB2184991A - Lifting apparatus - Google Patents

Abstract

A tension apparatus comprises a first hook (1216) for supporting a tension mechanism, a body (1201) attachable to the first hook and including a shaft and associate winding pulley. The pulley has an associated pawl/ratchet mechanism, a manual control stop for restraining operation of the pawl/ratchet mechanism and for permitting free rotation thereof, a lever for operating the pawl/ratchet mechanism and a second hook supported by the body in a portion remote from the first hook. The second hook may be a double velocity type, a one-piece type or a multi-piece set type. A tension indicating overload safety equipment is also provided. <IMAGE>

Description

SPECIFICATION The improvement of the tension apparatus (I) BACKGROUND OF THE INVENTION: The invention is an improved design focusing on the following defects of the tension apparatus having American Patent No. 3003359, 3881361 and 3985342: 1. It has only a single velocity drive inspite of the tensed object weight.

2. The hanging hook in two sections needs higher cost.

3. It can be used for the tension of two forced ends and needs many tension apparatus, when the steel grinder strong forced type structure is tensed.

4. It has no design about tension indicator.

5. It has no design about forced overload safety.

SUMMARY OF THE INVENTION: The traditional tension apparatus is used for single type force saving equipments which can't be easily done by the manual force, such as the tension of steel grinder type constructive structure, antiglide for the vehicle on the sloping plate or removal of the obstructive object on the ground.

But the traditional tension apparatus as shown in the enclosure 1 has the following defects: 1. It has only a single velocity drive inspite of the tensed object weight.

2. The hanging hook in two sections needs higher cost.

3. It can be used for the tension of two forced ends and needs many tension apparatuses, when the steel grinder strong forced type structure is tensed.

4. It has no design about the tension indicator.

5. It has no design about forced overload safety.

BRIEF DESCRIPTION OF THE DRAWINGS: Figure 1 is a view of the tension apparatus using the hanging operation of the curved hanging joints (or hanging hooks) fixed with the end of the tensed thick rope for the selection of the drive velocity.

Figure 1-1 is an orthographic view of Fig.

1.

Figure 1-2 is a side view of Fig. 1.

Figure 1-3 is an actional view of the light load and high speed of the double velocity tension apparatus.

Figure 1-4 is an actional view of the weigh load and low speed of the double velocity tension apparatus.

Figure 2 is a view of the tension apparatus using U-shaped stop block which can be disassembled by the manual force and has the roller fixed with the end of the tensed thick rope for the selection of the drive velocity.

Figure 2-1 is an orthographic view of Fig.

2.

Figure 2-2 is a side view of Fig. 2.

Figure 2-3 is a view of the tension apparatus using U-shaped stop block (or stop plate) which can be disassembled by the manual force and is fixed with the end of the tensed thick rope for the selection of the drive velocity.

Figure 2-4 is a side view of Fig. 2-3.

Figure 3 is a view of the applicable example of one piece type lower hanging hook.

Figure 3-1 is an orhtographic view of Fig.

3.

Figure 3-2 is a side view of Fig. 3.

Figure 4 is a view of the applicable example of two-piece-connected type lower hanging hook.

Figure 4-1 is an orhtographic view of Fig.

4.

Figure 4-2 is a side view of Fig. 4.

Figure 4-3 is a view of the applicable example of tension apparatus set with multidirectional tension.

Figure 5 is a view of the applicable example of the single sectional type multi-set hanging hook.

Figure 6-1 is an orthographic view of Fig.

5.

Figure 5-2 is a side view of Fig. 5.

Figure 6 is a view of the applicable example of two sectional type multi-set hanging hook.

Figure 6-1 is an orthographic view of Fig.

6.

Figure 6-2 is a side view of Fig. 6.

Figure 7 is a view of the applicable example of stack type hanging hook with the scale indicator indicating the deformative tension.

Figure 7-1 is an orthographic view of Fig.

7.

Figure 7-2 is a side view of Fig. 7.

Figure 7-3 is a view of the example of the scale installed on the side in Fig. 7.

Figure 8 is a view of the applicable example of the tension indication using the compression spring with the forced joint.

Figure 8-1 is an orthographic view of Fig.

8.

Figure 8-2 is a side view of Fig. 8.

Figure 9 is a view of the applicable example of the tension indication using V-shaped forced spring leaf within the forced joint.

Figure 9-1 is an orthographic view of Fig.

9.

Figure 9-2 is a side view of Fig. 9.

Figure 10 is a view of the hanging hook set with outer forced safety lock.

Figure 10-1 is an orthographic view of Fig.

10.

Figure 10-2 is a side view of Fig. 10.

Figure 11 is a view of the applicable example of hanging hook set with its own preservation for abruption and destruction of the long strip type structure.

Figure 11-1 is an orthographic view of Fig.

11.

Figure 11-2 is a side view of Fig. 11.

Figure 11-3 is an orthographic view of the stack type hanging hook set with part of stack plate for the abruption and destruction of the long strip type structure.

Figure 11-4 is a side view of Fig. 11-3.

Figure 12 is a structural view of the tension apparatus using machine frame deformation for the generation of alarm soung.

Figure 12-1 is an orthographic view of Fig.

12.

Figure 12-2 is a side view of Fig. 12.

Figure 12-3 is a structural view of the tension apparatus using machine frame deformation for the generation of stop lock operation.

Figure 12-4 is an orthographic view of Fig.

12-3.

Figure 12-5 is a side view of Fig. 12-3.

DETAILED DESCRIPTION OF THE INVENTION: General speaking, the traditional tension apparatus has the following structures: ---a upper hanging hook set is used for the hanging up the tension mechanism; --- a square-shaped machine body, in which its upper side is connected with the upper hanging hook set and its middle parts has a transverse shaft for the pentration a tension thcik rope roller; ---a tension thick rope roller with concave surface on the middle for the twist of the tension thcik rope and a single way buckthorn toothed wheel installed on a side; ---a manual control stop block locates at the upper side of the buckthorn toothed wheel used for the manual operation in order to prevent the inversion of the buckthorn wheel or the release into free rotation;; ---a drive block driven by the annual operation is used for driving buckthorn with back and forth motion; ---a lower hanging hook set is driven by the tension thick rope.

The basic structure of the above-said tension apparatus is shown in American Patent No. 3003359, and American Patent No.

3881361 and 3985342 are the improved design based on American Patent No. 3003359.

According to our application, American Patent No. 3003359, 3881361 and 3985342 have the following defects: 1. It has only a single velocity drive inspite of the tensed object weight.

2. The hanging hook in two sections needs higher cost.

3. It can be used for the tension of two forced ends and needs many tension apparatuses, when the steel grinder strong forced type structure is tensed.

4. It has no design about tension indicator.

5. It has no design about forced overload safety.

The above-said defects described in point 1, 2 and 3 are the defects of hanging-up structure and which in point 4 and 5 are the safety structure not in them.

Focusing on the above-said defects, the applicant has designed the following improved structures: A. Concerning the improvement of the hanging structure: including 1. double velocity type hanging hook, 2. one piece type hanging hook, 3. multi-piece set type hanging hook; B. Concerning the improvement of the safety equipment: including 1. tension indicating and overload safety equipment, 2. Overload stoppage and sound alarm, 3. presetting and indication of the tension.

Its details are described as follows: As shown in Fig. 1, 1-1 and 1-2, in order to select the applicable type of the tension apparatus, such as light load and high speed one as shown in Fig. 1-3 or weigh load and low speed one as shown in Fig. 1-4 by the operator, Fig. 1 shows its structure are the connection of the hole 105 used for the hanging up of the hanging hook 101 on the lower part of machine body 104 of the tension apparatus, or the curved hanging joint 106 or hanging hook 106' connected with the tension thick rope 103 with the end of the tension thick rope 103.twisted on the roller 102 at the lower hanging hook 101 for operating selection; i.e. its structural types are: ---the tension thick rope 103 twisted the roller 102 on the lower hanging hook 101 and its end fixed at a curved hanging joint 106 or hanging hook 106'; ---a hole used for hanging up of the curved hanging joint 106 or hanging hook 106' is in the lower part of the tension apparatus; ---the curved hanging joint 106 or hanging hook 106' can be hanged on the tension thcik rope 103.

Based on the basic principle of the roller, the light load and high speed movement is contructed by the hanging up of the curved hanging joint 106 or hangong hook 106' on the tension thick rope 103 at teh upper end of roller 102 of lower hanging hook 101, or weigh load and low speed movement with 1/2 of velocity is constructed by the hanging up of curved hanging joint 106 or hanging hook 106' on the hole at the lower end of the machine body of the tension apparatus and therefore force-saving effect generated by the roller.

Fig. 2, 2-1 and 2-2 is another structural example of Fig. 1. Its main feacture is that the curved hanging joint shown in Fig. 1 is replaced by a U-shaped stop block 206 having pentrating hole, and a auxiliary roller 207 is within is upper end and is pentrated and com posed by the disassembled screw pin 208 and nut 209. When the stop block is installed at the lower end of the tension apparatus, the tension apparatus shows the drive situation with 1/2 velocity and weigh load; while the roller 207 of stop block 206 hangs up directly on the outer side of the roller, the tension apparatus shows the drive situation with light load and high speed.

This function can be also gotten by the improvement of the usual tension apparatus with only U-shaped joint. Its applicable examples shown in Fig. 2-3 and 2-4 show the connection of U-shaped stop block 206 (or stop plate) shown in Fig. 2 with the end of the tension thick rope 203. Its structural features are as follows:: ---the tension thick rope is twisted on the roller 202 at the lower hanging hook 201 and then its end is fixed with a stop block 206; ---U-shaped stop block 206 having a hole used for the penetration of the tension thick rope, and further it is pressed with the solderless terminal 210 or connected in action, and the stop block having a transverse hole 211 used for manual disassembly and assembly with the hole 205 at lower end of the machine body 204 of the tension apparatus using the screw pin 208 and the nut 209; ---a forced face of U-shaped block 206 petrated by the tension thick rope 203 is larger than the pitch between hanging hook 201 and the roller 202.

Based on the basic principle of the roller, the movement situation with light load and high speed is constructed by free forcing to side of the roller 202 or lower hanging hook using stop block 206, or the movement situation with weigh load and 1/2 of velocity is constructed by the connection of hole 205 at the lower end of the machine body 204 with stop block 206.

As shown in the applicable examples in Fig.

1 and 2, we can select the presetting location of curved hanging joint 106 or stop block 206 to let the tension apparatus move with light load and high speed or with weigh load and low speed. The type of lower hanging hook in the above-said application can be free selected either in double section type as shown in American Patent No. 3985342, or single section type as shown in Fig. 3.Because the safety and cost of hanging hook and its operative convenience are very important, the structural features of the improved one piece type hanging hook 301 shown in Fig. 3, 3-1 and 3-2 based on two section type with irregular pendulous motion during the usage are as follows: ---the hanging hook 301 is manufactured in one piece type, in which a side shows the curved hook type 302, whereas the another end shows U-shaped double branch arm 302 and both have co-central holes 304; ---a roller 305 locates in the middle of Ushaped double branch arm 303 and is pentrated transversely by a set of central rod 306 for free rotaion of the roller 305.

This one piece type hanging hook used for the tension apparatus serves as a strong and applicative design, therefore, the ineffective pendulous joints in the tension apparatus has been reduced.

Fig. 4, 4-1 and 4-2 show one piece type roller composed by two pieces, in which it is U-shaped thick iron plate 401 composed of two curved thick iron plates 401, its lower part having hook types 402 which is reveted and fixed each other and its upper part connected each other. Its structural features are as follows: - - - The lower part of two curved thick iron plate 401 show hook type 402, on which the holes can be reveted each other to form a hanging hook type; The upper curved part of two connected iron plates show U-shaped open fork type branch arm and have co-central holes 405 respectively; ---The roller 406 is installed in the middle of U-shaped open fork type branch arm, and a set of central rod 407 pentrates transversely for free rotation of the roller.

Same as Fig. 3, this design serves as a atrong and applicative hanging hook roller set and reduced the ineffective pendulous part in the tension apparatus.

Furthermore, as shown in Fig. 4, the stack type structure can be developed to several sets of independent or double-used type hanging hook structure and then used for the tension apparatus. As shown in the above-said case, the tension apparatus is usually used for the tension of steel grinder and strong forced type structure and the stress of a direction is composed by the tensions forced from four directions to the center during the application (See Fig. 4-3). If the traditional tension apparatus is used in this case, it needs two or more sets of tension apparatuses. Its defect lies in that it is difficult to check whether each set has equal tension. In order to improve this defect, the abovesaid multi-set of hanging hook design is resonable.

This improved design of tension apparatus with multi-set hanging hook composes of sin gle section type multi-set hanging hook and double section type multi-set hanging hook.

Fig. 5, 5-1 and 5-2 show the applicable example of single section type multi-set hanging hook, in which it is composed of two sets of hanging hooks in parallel. Its features are as follows: ---Two parallel hanging hooks 501 have narrower upper sections and have a transverse hole 502 and a roller 503 respectively. Two sides of transverse pin 504 are fixed by the buckle rings 505; ---Two parallel hanging hooks have wider lower sections and can be leant on each other after parallel location.

The above-said hanging hook set can be used for the tension of multi-direction or in parallel in order to increase the forced strenght.

Fig. 6, 6-1 and 6-2 are the applicable examples of double section type multi-set hanging hook, in which two or more sets of hanging hooks are pentrated and coupled by the transverse screw at the lower end of Ushaped iron plate set with auxiliary roller.

Its structural features are as follows: ---Two sets of iron plates 601 have the circular holes respectively at their upper ends for roller sets 602 and roller shafts 603 installed in them, in which roller shafts 603 are fixed by the outer buckle ring 604; ---Two sets of iron plates 601 have circular holes respectively at their lower ends for two or more sets of hanging hook sets 605 installed in them, and are pentrated and composed by a screw, then connected by the nut 607.

In the practical application, this applicable example can get same result come from independent application and parallel application as shown in Fig. 5.

Furthermore, the above-said traditional manual tension apparatus don't install load tension indication and safety equipment due to its simple structure, thus it is easy to destroy manual tension apparatus or to abrupt the tension thick rope or to happen other accidents during the application.

Focusing on these defects, the various improved designs are as follows: ---tension indicating equipment, ---tension overload safety pin or safety equipment, ---having sound alarm and overload stoppage equipment.

In the point 1, because the tension apparatus is a multi-joint forced equipment, many positions can be used for the installation of forced joints. Its various methods which can be replaced one another are described as follows: Fig. 7, 7-1 and 7-2 are the structural applicable examples of stack type hanging hook showing pliant deformation indication using the middle section. The hanging hooks shown in the drawing are composed of three pieces.

Its structural features are as follows: ---The middle stack plate 701 is made of pliant metal. Its inner surface arc 702 is more convex than the inner surface arc 703 of stack plates on two sides in order to force at first and to generate the deformation in propertion to the forced situation and the balance of stack plates 703 on two sides; ---The stack plates 703 on the sides are made of tough metal; ---The stack plate set shows a hook type, in which the hole for riveting each other of rivets 705; and the another side shows no hook type, but has larger hole 706 for the connection with tension apparatus 707; ---The upper side of the middle stack plate 701 shows convex type 708 and the forced scale 709 in propertion to the deformation are on its side.

The above-said scale 709 can be installed on the front of hanging hook after the assembly as shown in Fig. 7-3.

The structural type of the above-said tension indication can be shown as which in Fig.

8, 8-1 and 8-2 that the connecting plate 801 of the tension apparatus having the holes is connected with the joint coupled and pentrated by the pin rod 802 with larger diameter of hat type 803 top part at its end and before the connection, a circular spring 804 or ball type disc spring 804' should be encased on the pin rod in advance in order to generate a relative deformation resulted by the pressure caused from the endured force of hat type structure 803 with larger diameter during the tension and the tension value is shown on the relative scale 805 of the pin rod 802.

The another applicable example of the structure as shown in Fig. 8 is same as which shown in Fig. 9, 9-1 and 9-2. A long chute hole 902 is installed in the rod body of pin rod 901 with hat type top part. A transverse hole is located on the two sides od the lower part of long chute hole for the insertion of a transverse pin 903 and a set of V-shaped spring leaf 904 with the width smaller than which of long cute hole is inserted into the long chute hole and is pressed under the transverse pin, in which the opening end of Vshaped spring leaf faces hat type top part of the pin 901.

After the above-said V-shaped spring leaf 904 has connected with the pin rod 901 having hat type top part, it pentrates through Ushaped iron plate 905 on the manual tension apparatus with a coupling hole to form a deformation generated by the tension of both part and the pressure against V-shaped spring leaf. When the most compression upon the Vshaped spring leaf 904 has reached, its upper end is located at the place near of the bottom side of hat type top part of pin rod and the pitch between both parts is smaller than the thickness of U-shaped iron plate.

The tension scale 906 is proportion to the deformative quantity for reading out is engraved on the pin rod with hat type top part.

Concerning the installation of the safety equipment for forced overload of the tension apparatus, it is protected mainly by the safety pin, or presetting abruptive range or automatic stop equipment. The various applicable structural examples are described as follows: As shown in Fig. 10, 10-1 and 10-2, the safety pin plate is installed on the hanging hook. The features of its structure are as follows: ---a hanging hook set 1001 has a curved hook type 1002 at its one end, a flat circular type 1003 at another end and a long strip type hole chute 1004 in the middle. Its longitudinal direction is parallel with the presetting hanging direction.The transverse hole set 1006 is located in the middle part for the insertion of safety pin 1005 and it divides the long strip type hole chute 1004 into the hole near of hook side 1004' and the hole far from the hook side 1004"; ---when this hanging hook 1001 connects with the tension apparatus, its link rod 1008 pentrates through the hole 1004' near of hook side; ---when the outer tension is too large, the safety pin 1005 is bended to remind the operator.

The method about the safety rod 1005 located transversely in the long chute hole 1004 can be used for the active joint connected with the upper part of the tension apparatus 1007 (as hole 1216 shown in Fig. 12) or roller shaft hole of lower hanging hook (as hole 116 shown in Fig. 1 or hole 216 shown in Fig. 2) to generate the alarm effect.

Its another applicable example is shown in Fig. 11, 11-1 and 11-2, i.e. a long strip structure 1102 between two holes is reserved during the manufacture of hanging hook 1101 for abruptive function during the overload.

When it connects with the tension apparatus 1103, the pin 1104 for the connection is inserted into the hole near of hook side. Its function is same as which of the safety pin shown in the applicable example of Fig. 10.

In the Fig. 11-3 and 11-4, the multi-stackplate type hanging hook uses the part of stack plates to make long strip structure reserved between two holes for the abruption during the overload. This design with reservation of overload abruptive position can be also used for the joint part constructed by the pins in the tension apparatus.

When the danger situation of overload tension is coming, the active previous alarm or stoppage is more effective protective method.

Fig. 12, 12-1 and 12-2 are the applicable examples of sound alarm during the overload tension. Its main structures and principles are as follows: ---A generatic frame 1201 can clamp fixed proporational towars the center during endurance of the pressure from two ends is composed of the rods on all sides; ---The wheel shaft 1202 of middle tension thick rope and the transverse shaft 1 204 for the insertion of stop jaw 1203 on its upper side and transverse shaft 1205 on its lower side for fixing use relative to the above-said structure of machine frame is permitted the machine frame 1201 to deform and to clamp towards the inner part;; ---The continuous structure with ring type convex or concave type 1207 is located on a side or on two sides of tension thick rope wheel 1206, and the machine frame 1201 faced to it has a spring leaf 1208 for the generation of alarm sound during the contact of two parts under the deformation od machine frame 1201 due to overload.

In order to present the danger caused by the overload drive, for example, When we want to remove the tree head in the ground, it is easy to suffer the danger due to the structural destruction of tension apparatus or interruption of tension thick rope during the overload situation, in this case, as shown in Fig. 12, we can install the friction plates 1209 on the inner side of machine frame 1201 to form a friction stoppage and lock function by the sides of tension thick rope wheel 1206 during the increasement of the deformation, and let the operator can't operate.Fig. 12-3, 12-4 and 12-5 show its main structural examples as follows: ---A geometric frame 1201 can clamp fixed proportional towards the center during the endurance of the pressure from two ends is composed of the rods on all sides; ---The wheel shaft 1202 of middle tension thick rope and the transverse shaft 1204 for the insertion of stop jaw 1203 on its upper side and transverse shaft 1205 on its lower side for fixing use, relative to the abovesaid structure of machine frame is permitted the machine frame 1201 to deform and to clamp towards the inner part; ---A side or two sides of tension thick rope wheel 1206 are used for friction stoppage face 1210, on which the friction lines can be made; ---The friction plate 1209 is installed on the inner side of machine frame facing the friction stoppage face 1210 of tension thick rope wheel 1206. Under the normal condition, there is a pitch between this friction plate 1209 and friction face 1210 of tension thick rope wheel 1206. Two parts comes each other gradual nearly, when the tension becomes larger gradually. Both will show clamping stoppage and lock situation during the overload.

In the practical application, we can use the abovesaid overload friction stoppage structure together with the sound alarm structure and install them on a same side or on two sides respectively.

In a word, we have improved the structural elements and add the another elements and assemblies to this invention, and let the tension apparatus get the improvement concerning the hanging structure and safety equipment. Therefore, this invention has new method and is practical.

Claims (16)

1. The tension apparatus having following structures is composed of: ---a upper hanging hook set is used for the hanging up the tension mechanism; ---a square-shaped machine body, in which its upper side is connected with the upper hanging hook set and its middle part has a transverse shaft for the pentration of a tension thick rope roller; ---a tension thick rope roller with concave surface on the middle for the twist of the tension thick rope and a single way buckthorn toothed wheel installed on a side; ---a manual control stop block locates at the upper side of buckthorn toothed wheel used for manual operation in order to prevent the inversion of buckthorn wheel or release into free rotation; ---a drive block driven by the manual operation is used for driving buckthorn with back and forth motion; ---a lower hanging hook set is driven by the tension thick rope.

Its main improved features include: having the improvement of hanging structure; including ---double velocity type hanging hook, ---one piece type hanging hook, - - - multi-piece set type hanging hook; and having the improvement of safety equipment, including ---tension indicating and overload safety equipment, ---overload stoppage and sound alarm, ---presetting and indication of the tension.

2. The improved double velocity hanging hook of the tension apparatus described in claim 1 includes the connection of the hole used for hanging up of hanging hook on the lower part of machine body of tension apparatus, or the curved hanging joint or hanging hook connected with the tension thick rope with the end of tension thick rope twisted on the roller at the lower hanging hook for operating selection; i.e. its structural types are: ---the tension thick rope twisted the roller on the lower hanging hook and its end fixed at a curved hanging joint or hanging hook; - - - a hole used for hanging up of the curved hanging joint or hanging hook is in the lower part of the tension apparatus; ---the curved hanging joint or hanging hook can be hanged on the tension thick rope.

3. The improved double velocity hanging hook of the tension apparatus described in claim 1 includes the curved hanging joint shown in Fig. 1 is replaced by a U-shaped stop block having pentrating hole, and a auxiliary roller is within its upper end and is pentrated and composed by the disassembled screw pin and nut. When the stop block is installed at the lower end of tension apparatus, the tension apparatus shows the drive situation with 1/2 of velocity and weigh load; while the roller of stop block hangs up directly on the outer side of the roller, the tension apparatus shows drive situation with light load and high speed.

4. The improved double velocity hanging hook of the tension apparatus described in claim 1 includes: ---the tension thcik rope is twisted on the roller at the lower hanging hook and then its end is fixed with a stop block; ---a U-shaped stop block having a hole used for the pentration of tension thick rope, anf further it is pressed with solderless terminal or connected in action, and the stop block having a transverse hole used for manual disassembly and assembly with hole at lower end of machine body of tension apparatus using screw pin and nut; ---a forced face of U-shaped block pentrated by the tension thick rope is larger than the pitch between lower hanging hook and the roller.

5. The structural features of improved one piece type hanging hook of the tension apparatus described in claim 1 are as follows: ---the hanging hook is manufactured in one piece type, in which a side shows curved hook type, whereas the another end shows Ushaped double branch arm and both have cocentral holes; - - - a roller locates in the middle of U-shaped double branch arm and is pentrated transversely by a set of central rod for free rotation of the roller.

6. The structural features of improved one piece type hanging hook of the tension apparatus described in claim 1 are as follows: one piece type roller is composed of two pieces, in which it is U-shaped thick iron plate composed of two curved thick iron plates, its lower part having hook type which is riveted and fixed each other and its upper part connected each other. It has: ---the lower part of two curved thick iron plate show a hook type, on which the holes can be revited each other to form a hanging hook type; ---the upper curved part of two connected iron plates show U-shaped open fork type branch arm and have co-central holes respectively; ---the roller is installed in the middle of Ushaped open fork type branch arm, and a set of central rod pentrates transversely for free rotation of roller.

7. The features of improved multi-plate set type hanging hook of the tension apparatus described in claim 1 are as follows: ---Two parallel hanging hooks have narrower upper sections and have a transverse hole and a roller respectively. Two sides of transverse pin are fixed by the buckle rings; ---Two parallel hanging hooks have wider lower sections and can be leant on each other after the parallel location.

8. The features of improved multi-plate set type hanging hook of the tension apparatus described in claim 1 lies in that two or more sets of hanging hooks are pentrated and coupled by the transverse screw at the lower end of U-shaped iron plate set with auxiliary roller. Its structural features are as follows: ---Two sets of iron plates 601 have circular holes respectively at their upper ends for roller set and roller shafts 603 installed in them, in which the roller shafts are fixed by the outer buckle ring; ---Two sets of iron plates have the circular holes respectively at their lower ends for two or more sets of hanging hook sets installed in them and are pentrated and composed by a screw, then connected by the nut.

9. The main features of improved tension indication of the tension apparatus described in claim 1 are as follows: ---The middle stack plate is made of pliant metal. Its inner surface arc is more convex than the inner surface arc of stack plates on two sides in order to force at first and to generate the deformation in proportion to the forced situation and the balance of stack plates on two sides; ---The stack plates on the sides are made of tough metal; ---The stack plate set shows a hook type, in which the hole for riveting each other of rivets and the another side shows no hook type, but has larger hole for the connection with tension apparatus; ---The upper side of the middle stack plate shows convex type and the forced scale in proportion to the deformation are on its side.

10. The main features of improved tension indication of the tension apparatus described in claim 1 are further as follows: The connecting plate of the tension apparatus having the holes is connected with the joint coupled and pentrated by pin rod with larger diameter od hat type top part at its end and before the connection a circular spring or ball type disc spring should be encased on pin rod in advance in order to generate a relative deformation resulted from the pressure caused by the endured force of hat type structure with larger diameter during the tension, and the tension value is shown on the relative scale of the pin rod.

11. The features of improved tension indication of tension apparatus described in claim 1 are further as follows: A long chute hole is installed in the rod body of pin rod with hat type top part. A transverse hole is located on the two sides of the lower part of long chute hole for the insertion of a transverse pin and a set of V-shaped spring leaf with the width smaller than which of long chute hole is inserted into the long chute hole and is pressed under the transverse pin, in which the opening end of V-shaped spring leaf faces hat type top part of the pin. After the above said Vshaped spring leaf has connected with the pin rod having hat type top part, it pentrates into U-shaped iron plate on the manual tension apparatus with a coupling hole to form a deformation generated by the tension of both parts and the pressure upon V-shaped spring leaf.When the most compression upon Vshaped spring leaf has reached, its upper end is located at the place near of the bottom side of hat type top part of pin rod and the pitch between both parts is smaller than the thickness of U-shaped iron plate. The tension scale in proportion to the deformative quantity for reading out is engraved on the pin rof with hat type top part.

12. The structural features of overload protecting pin of the tension apparatus described in claim 1 are as follows: ---A hanging hook set has a curved hook type at its one end, a flat circular type at another end and a long strip hole chute in the middle. Its longitudinal direction is parallel with the presetting hanging direction. The transverse hole set is located in the middle part for the insertion of safety pin and it divides the long strip type hole chute into the hole near of hook side and the hole far from the hook side; ---When this hanging hook connects with the tension apparatus, its link rod pentrates through the hole near of the hook side; --- When the outer tension is too large, the safety pin is bended to remind the operator; --- The method about the safety rod located transversely in the long chute hole can be used for all of active joint.

13. The structural features of overload protecting pin of the tension apparatus described in claim 1 are further as follows: A long strip structure between two holes is reserved during the manufacture of hanging hook for abruptive function during the overload. When it connects with the tension apparatus, the pin for connection is inserted into the hole of hook side, or the multi-stack-plate type hanging hook uses the part of stack plates to make long strip structure reserved between two holes for the abruption during the overload. This design with reservation of overload abruptive position can be also used for the joint part constructed by the pins in the tension apparatus.

14. The structural features of overload sound alarm of tension apparatus described in claim 1 are as follows: ---A geometric frame can clamp fixed proportional towards the center during the endurance of the pressure from two ends is composed of the rods on all sides; --- The wheel shaft of middle tension thick rope and the transverse shaft for the insertion of stop jaw on its upper side and transverse shaft on its lower side for fixing use, relative to the above-said structure of machine frame is pentrated the machine frame to deform and to clamp towards the inner part;; ---The continuous structure with ring type convex or concave type is located on a side or on two sides of tension thick r pe wheel, and the machine frame faced it ha a spring leaf for generation od alarm sound during the contact of two parts under the deformation of machine frame due to overload.

15. The structural features of overload stoppage and lock of tension apparatus described in claim 1 are as follows: ---A geometric frame can clamp fixed proportional towards the center during endurance of pressure from two ends is composed of the rods on all sides; ---The wheel shaft of middle tension thick rope and the transverse shaft for insertion of stop jaw on its upper side and transverse shaft on its lower side for fixing use, relative to the above-said structure of machine frame is permitted the machine frame to deform and to clamp towards the inner part; ---A side or two sides of tension thick rope wheel are used for friction stoppage face, on which the friction lines can be made; ---The friction plate is installed on the inner side of machine frame facing the friction stoppage face of tension thick rope wheel. Under the normal condition, there is a pitch between this friction plate and friction face of tension thick rope wheel. Two parts come each other gradual nearly, when the tension becomes larger gradually. Both will show clamping stoppage and lock situation during the overload.

16. The structural improvement of overload alarm soun and overload stoppage and lock of tension apparauts described in claiml lies in that we can use the above-said overload friction stoppage structure together with the sound alarm structure and install them on a same side or on two sides respectively.