wrench

Abstract

Wrench comprising: a base body (1) in which a fixed jaw (11) extends upwards on one side of an end surface, while on the opposite side of the end surface a recess is provided for forming a sliding groove (12), wherein a sliding groove opening (121) is formed on the side of the base body (1) facing away from the fixed jaw (11), which is continuously connected to the sliding groove (12), wherein the base body (1) further comprises a connecting recess (13) and a pivot bore (14) extends from one side of the base body (1) through the connecting recess (13) to the other side;a movable block (2) which has a movable jaw (21) and a sliding section (22) connected thereto, wherein the sliding section (22) is movably arranged in the sliding groove (12) and the movable jaw (21) is moved towards or away from the fixed jaw (11) as a result of a displacement of the sliding section (22) to form a clamping area (7), wherein an actuating recess (23) is further formed below the sliding section (22), which is continuously connected to the connecting recess (13); an end cover (3) which is attached to the side of the base body (1) provided with the sliding groove opening (121);an elastic element (4) which is arranged in the sliding groove (12), wherein the two ends of the elastic element (4) each bear elastically against the end cap (3) and against the sliding section (22) of the movable block (2), and the winding diameter of the elastic element (4) decreases continuously from the end bearing against the sliding section (22) to the end bearing against the end cap (3);a handle part (5) having at one end an actuating section (51) and a connecting section (52) connected thereto, wherein the handle part (5) is inserted into the connecting recess (13) by means of the connecting section (52) and the actuating section (51) engages in the actuating recess (23), wherein a locking pin (6) is movably guided through the connecting section (52), the connecting recess (13) and the pivot bore (14) and the actuating section (51) movably rests against the first recess wall (231) and the second recess wall (232) of the actuating recess (23).

Description

The present invention relates to the technical field of wrenches. Wrenches are widely used in a variety of work environments. Numerous types of wrenches are available on the market, such as ring wrenches, open-end wrenches, adjustable wrenches, and so on. This discussion focuses on a common adjustable wrench. With technological advancements, conventional adjustable wrenches require manual, repeated approach to engage the fastener (e.g., a screw) and subsequent retraction to remove it, a process that must be repeated with each rotation. This is both labor-intensive and physically demanding for the user. Therefore, manufacturers have developed adjustable wrenches with a continuous actuation mechanism. Reference is made to Taiwanese patent no. TWI429510B, which discloses a wrench comprising a main body, a movable jaw, a sliding element, a handle, and an elastic element. While such a reciprocating adjustable wrench solves the problems of conventional manually operated designs, it still has certain disadvantages. In particular, due to the limited installation space, the elastic element cannot be installed by machine by fitters or maintenance personnel but must be inserted manually, which is both time-consuming and costly. Furthermore, the elastic element often needs to be replaced due to material fatigue as its use progresses. However, because of the complicated installation, users frequently opt for a complete replacement, resulting in a waste of resources. Therefore, after a thorough examination of the relevant state of the art, a comparison of the respective advantages and disadvantages, and the execution of numerous experiments and tests, a wrench was developed that eliminates the aforementioned shortcomings and meets the requirements of the users. The main objective of the present invention is to provide a wrench that enables easy assembly and convenient operation. To achieve the above advantageous effects and to eliminate the shortcomings of the prior art, the present invention provides a wrench comprising: a base body in which a fixed jaw extends upwards on one side of an end face, while on the opposite side of the end face a recess is provided for forming a sliding groove, wherein a sliding groove opening is formed on the side of the base body facing away from the fixed jaw, which is continuously connected to the sliding groove, wherein the base body further comprises a connecting recess and a pivot bore extends from one side of the base body through the connecting recess to the other side;a movable block comprising a movable jaw and a sliding section connected thereto, wherein the sliding section is movably arranged in the sliding groove and the movable jaw is moved towards or away from the fixed jaw as a result of a displacement of the sliding section to form a clamping area, wherein an actuating recess is further formed below the sliding section, which is continuously connected to the connecting recess; an end cap which is attached to the side of the base body provided with the sliding groove opening; an elastic element which is arranged in the sliding groove, wherein the two ends of the elastic element bear elastically against the end cap and against the sliding section of the movable block respectively, and the coil diameter of the elastic element decreases continuously from the end bearing against the sliding section to the end bearing against the end cap;a handle part, one end of which has an actuating section and a connecting section connected thereto, wherein the handle part is inserted into the connecting recess by means of the connecting section and the actuating section engages in the actuating recess, wherein a locking pin is movably guided through the connecting section, the connecting recess and the joint bore and the actuating section movably rests against the first recess wall and the second recess wall of the actuating recess. The handle part has several anti-slip elements on its outer surface. Here, the end cap has a locking recess on the side facing the elastic element, whereby the elastic element is locked into the locking recess and rests against it when the end cap is attached to the base body. Here, the sliding groove is further subdivided into a rectangular groove section and an arc-shaped groove section, which are continuously connected to each other, wherein the arc-shaped groove section is designed as a cylindrical bore and the rectangular groove section as a rectangular opening, wherein the sliding section, corresponding to the shapes of the rectangular groove section and the arc-shaped groove section, further comprises a sliding rod and a sliding block, wherein the sliding rod is arranged in the rectangular groove section and the sliding block in the arc-shaped groove section. Here, the elastic element is arranged in the arc-shaped groove section. Fig. 1 shows a schematic perspective view according to the present invention. Fig. 2 shows a schematic exploded view according to the present invention. Fig. 3 shows a schematic sectional view along section line III-III according to Fig. 1. Fig. 4 shows a schematic sectional view of a first successive step according to the present invention. Fig. 5 shows a schematic sectional view of a second successive step according to the present invention. Fig. 6 shows a first schematic view of an operating state according to the present invention. Fig. 7 shows a second schematic view of an operating state according to the present invention. Fig. 8 shows a schematic block diagram of the steps according to the present invention. For a better understanding of the embodiments of the present invention, the features and advantageous effects are explained in detail below with reference to the drawings and exemplary embodiments. As shown in Figs. 1, 2, 3, 4, 5, 6, 7 to 8, the wrench according to the invention comprises the following: a base body 1 in which a fixed jaw 11 extends upwards on one side of an end face, while on the opposite side of the end face a recess is provided for forming a sliding groove 12, wherein a sliding groove opening 121 is formed on the side of the base body 1 facing away from the fixed jaw 11, which is continuously connected to the sliding groove 12, wherein the base body 1 further has a connecting recess 13 and a pivot bore 14 extends from one side of the base body 1 through the connecting recess 13 to the other side;a movable block 2, which has a movable jaw 21 and a sliding section 22 connected thereto, wherein the sliding section 22 is movably arranged in the sliding groove 12 and the movable jaw 21 is moved towards or away from the fixed jaw 11 as a result of a displacement of the sliding section 22 in order to form a clamping area 7, wherein an actuating recess 23 is further formed below the sliding section 22, which is continuously connected to the connecting recess 13; an end cover 3, which is attached to the side of the base body 1 provided with the sliding groove opening 121;an elastic element 4 which is arranged in the sliding groove 12, wherein the two ends of the elastic element 4 each bear elastically against the end cap 3 and against the sliding section 22 of the movable block 2 and the winding diameter of the elastic element 4 decreases continuously from the end bearing against the sliding section 22 to the end bearing against the end cap 3; a handle part 5, one end of which has an actuating section 51 and a connecting section 52 connected thereto, wherein the handle part 5 is inserted into the connecting recess 13 by means of the connecting section 52 and the actuating section 51 engages in the actuating recess 23, wherein a locking pin 6 is movably guided through the connecting section 52, the connecting recess 13 and the pivot bore 14 and the actuating section 51 movably rests against the first recess wall 231 and the second recess wall 232 of the actuating recess 23. In use, the actuation process can be divided into a rotation step S01 and a return step S02, which are explained in more detail below: Rotation step S01: The user grasps the handle part 5 and aligns the clamping area 7 with a fastener 8, for example, a screw, nut, or the like with a hexagonal or polygonal head. As the user rotates forward, the actuating section 51 of the handle part 5 is pressed against the first recess wall 231 of the actuating recess 23, causing the elastic element 4 to relax and the sliding section 22 to move the movable jaw 21 toward the fixed jaw 11. This reduces the clamping area 7 so that the fixed jaw 11 and the movable jaw 21 can clamp the fastener 8, thus enabling the fastener 8 to be tightened or loosened, as shown in Figures 4, 6, and 8. Reset step S02: After the rotary movement described above has reached its actuation limit, the user can move the handle part 5 in the opposite direction, causing a reverse rotation. In doing so, the actuating section 51 of the handle part 5 is pressed against the second recess wall 232 of the actuating recess 23, compressing the elastic element 4 and causing the sliding section 22 to move the movable jaw 21 away from the fixed jaw 11. This increases the clamping area 7, allowing the fixed jaw 11 and the movable jaw 21 to be displaced relative to the fastening element 8 along its edges. As a result, no rotational force is exerted on the fastening element 8 between the fixed jaw 11 and the movable jaw 21 during the reverse rotation, as shown in Figures 5, 7, and 8. In summary, after completion of the reset step S02, the next rotation step S01 can be performed immediately. The user no longer needs to manually repeatedly move the wrench towards and away from the fastener 8. Instead, an automatic reset occurs after each rotation without repeated manual readjustment, resulting in both time and effort savings. Based on the foregoing description, further technical and structural features of the present invention are explained in more detail below. The sliding groove 12 is further divided into a rectangular groove section 122 and an arcuate groove section 123, wherein the rectangular groove section 122 is continuously connected to the arcuate groove section 123 and the arcuate groove section 123 is designed as a cylindrical bore, while the rectangular groove section 122 is designed as a rectangular opening. Corresponding to the shapes of the rectangular groove section 122 and the arcuate groove section 123, the sliding section 22 comprises a sliding rod 221 and a sliding block 222, wherein the sliding rod 221 is arranged in the rectangular groove section 122 and the sliding block 222 in the arcuate groove section 123.In this way, the sliding section 22 and the sliding groove 12 can engage precisely with each other by positive locking, resulting in an improved, firm connection, as shown in Fig. 2, Fig. 3, Fig. 5 and Fig. 7. Furthermore, assembly is carried out such that, after inserting the movable block 2 through the sliding groove opening 121 into the sliding groove 12 of the base body 1, the elastic element 4 is immediately inserted into the arcuate groove section 123. Subsequently, the end cap 3 is attached to one side of the base body 1 under compression of the elastic element 4, thus covering the sliding groove opening 121, for example by screwing it to the base body 1 with multiple screws, in order to prevent the movable block 2 and the elastic element 4 from sliding out. Moreover, if the elastic element 4 becomes fatigued due to long-term use or excessive stress and needs to be replaced, only the end cap 3 needs to be removed, allowing the elastic element 4 to be taken out and replaced. This avoids the need for the user to purchase a completely new unit due to a complex installation situation.Finally, the handle part 5 is inserted into the connecting section 52, so that the actuating section 51 engages in the actuating recess 23 and thus the locking pin 6 is guided through the connecting section 52, the connecting recess 13 and the joint bore 14, thereby completing the assembly, as shown in Figs. 1, 2, 3, 4, 5, 6 to 7. Furthermore, the end cap 3 has a detent recess 31 on the side facing the elastic element 4, whereby the elastic element 4 is engaged in the detent recess 31 and rests against it when the end cap 3 is attached to the base body 1. This ensures that the elastic element 4 is securely held between the movable block 2 and the end cap 3 and does not spring out of the arc-shaped groove section 123 under compression, as shown in Figs. 2, 3, 4, 5, 6 to 7. Furthermore, the handle part 5 has several anti-slip elements 53 on its outer surface to ensure a secure grip by the user. The increased contact area between the user's hand and the handle part 5 prevents the handle part 5 from easily slipping out of the user's hand during use, as shown in Figs. 1, 2, 3, 4, 5, 6 to 7. QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature TWI429510B

[0003]

Claims

Wrench comprising: a base body (1) in which a fixed jaw (11) extends upwards on one side of an end surface, while on the opposite side of the end surface a recess is provided for forming a sliding groove (12), wherein a sliding groove opening (121) is formed on the side of the base body (1) facing away from the fixed jaw (11), which is continuously connected to the sliding groove (12), wherein the base body (1) further comprises a connecting recess (13) and a pivot bore (14) extends from one side of the base body (1) through the connecting recess (13) to the other side;a movable block (2) which has a movable jaw (21) and a sliding section (22) connected thereto, wherein the sliding section (22) is movably arranged in the sliding groove (12) and the movable jaw (21) is moved towards or away from the fixed jaw (11) as a result of a displacement of the sliding section (22) to form a clamping area (7), wherein an actuating recess (23) is further formed below the sliding section (22) which is continuously connected to the connecting recess (13); an end cover (3) which is attached to the side of the base body (1) provided with the sliding groove opening (121);an elastic element (4) which is arranged in the sliding groove (12), wherein the two ends of the elastic element (4) each bear elastically against the end cap (3) and against the sliding section (22) of the movable block (2), and the winding diameter of the elastic element (4) decreases continuously from the end bearing against the sliding section (22) to the end bearing against the end cap (3);a handle part (5) having at one end an actuating section (51) and a connecting section (52) connected thereto, wherein the handle part (5) is inserted into the connecting recess (13) by means of the connecting section (52) and the actuating section (51) engages in the actuating recess (23), wherein a locking pin (6) is movably guided through the connecting section (52), the connecting recess (13) and the pivot bore (14) and the actuating section (51) movably rests against the first recess wall (231) and the second recess wall (232) of the actuating recess (23). Wrench according to claim 1, wherein the handle part (5) has several anti-slip elements (53) on its outer surface. Wrench according to claim 2, wherein the end cap (3) has a detent recess (31) on the side facing the elastic element (4), wherein the elastic element (4) is engaged in the detent recess (31) and rests against it when the end cap (3) is attached to the base body (1). Wrench according to one of the preceding claims, wherein the sliding groove (12) is further subdivided into a rectangular groove section (122) and an arcuate groove section (123), which are continuously connected to each other, wherein the arcuate groove section (123) is designed as a cylindrical bore and the rectangular groove section (122) as a rectangular opening, wherein the sliding section (22) further comprises a sliding rod (221) and a sliding block (222) corresponding to the shapes of the rectangular groove section (122) and the arcuate groove section (123), wherein the sliding rod (221) is arranged in the rectangular groove section (123) and the sliding block (222) is arranged in the arcuate groove section (122). Wrench according to claim 4, wherein the elastic element (4) is arranged in the arc-shaped groove section (123).

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