EP2835222B1 - Torque multiplier - Google Patents

Torque multiplier Download PDF

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Publication number
EP2835222B1
EP2835222B1 EP13179662.5A EP13179662A EP2835222B1 EP 2835222 B1 EP2835222 B1 EP 2835222B1 EP 13179662 A EP13179662 A EP 13179662A EP 2835222 B1 EP2835222 B1 EP 2835222B1
Authority
EP
European Patent Office
Prior art keywords
torque
circuit board
higher value
axle
multiplier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13179662.5A
Other languages
German (de)
French (fr)
Other versions
EP2835222A1 (en
Inventor
Xuan-ren CHEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mikawa Co Ltd
Original Assignee
Mikawa Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mikawa Co Ltd filed Critical Mikawa Co Ltd
Priority to EP13179662.5A priority Critical patent/EP2835222B1/en
Priority to PL13179662.5T priority patent/PL2835222T3/en
Priority to ES13179662.5T priority patent/ES2581928T3/en
Publication of EP2835222A1 publication Critical patent/EP2835222A1/en
Application granted granted Critical
Publication of EP2835222B1 publication Critical patent/EP2835222B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B17/00—Hand-driven gear-operated wrenches or screwdrivers
    • B25B17/02—Hand-driven gear-operated wrenches or screwdrivers providing for torque amplification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1425—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by electrical means

Definitions

  • the present invention relates to a torque multiplier for a wrench.
  • a torque multiplier can be used together with a manual, electric or pneumatic tool.
  • Torque multipliers can be found in US Patent Nos. 3861244 , 5176047 , 5616095 , 6012359 , 6742417 , 6810571 and 7284463 and Taiwanese Patent No. 195258 and M386143 .
  • a torque multiplier may be designed to provide a ratio such as 5:1 and 15:1 for multiplying the designed value of torque that can be exerted by a manual, electric or pneumatic tool.
  • loss of power in the torque multiplier is inevitable, and an actual ratio achievable by the torque multiplier is lower than the designed ratio.
  • the combination of the manual, electric or pneumatic tool with the torque multiplier fails to provide a multiplied value of torque as desired.
  • German utility model DE 20 2011 004979 U1 suggests a torque multiplier with detecting the torque including an input element for connection to a tool operable for exerting torque; an output element for connection to an object to be driven by the tool; a multiplying unit for connecting the input element to the output element and turning a lower value of torque at the input element to a higher value of torque at the output element; a measurement unit for measuring the higher value of torque and accordingly sending a signal to a display unit for showing the torque value.
  • said torque multiplier has a structure which is quite complex in assembly.
  • the present invention is intended to obviate or at least alleviate the problems encountered in prior art.
  • the torque multiplier is provided having the combined features of claim 1.
  • the torque multiplier 10 includes a shell 16, an input element 20, an output element 30, a multiplying unit 40, a measurement unit 50 and a display 60.
  • the shell 16 is used to contain both of the input element 20 and the multiplying unit 40.
  • the input element 20 includes a cavity for receiving a tongue 22 of a wrench 21.
  • the output element 30 includes an axle 31 for insertion in a cavity of a socket 23.
  • the multiplying unit 40 includes an end connected to the input element 20 and another end connected to the output element 30 via an axle 31.
  • the torque measurement unit 50 is attached to the shell 16.
  • the multiplying unit 40 is preferably a planetary gear train. In such a case, the shell 16 is made a ring gear.
  • the multiplying unit 40 will not be further described in detail for being conventional.
  • the measurement unit 50 includes a casing 51, a circuit board 52, a battery 53, a sensor 54, a wireless transmitter 55 and a switch 56.
  • the casing 51 is attached to the axle 31.
  • the casing 51 is used to contain the circuit board 52, the battery 53, the sensor 54 and the wireless transmitter 55.
  • the circuit board 52 is electrically connected to the battery 53, the sensor 54, the wireless transmitter 55 and the switch 56.
  • the battery 53 can be replaced with a new one.
  • the sensor 54 is further connected to the axle 31 so that the sensor 54 senses the deformation of the axle 31 when the torque is transmitted via the axle 31.
  • the sensor 54 is preferably a strain gauge.
  • the switch 56 is operable to turn the measurement unit 50 on or off.
  • the display 60 includes a wireless receiver 61, a screen 62, several buttons 63 and a siren 64. Although not shown, it should be understood that the display 60 includes a circuit board electrically connected to the wireless receiver 61, the screen 62, the buttons 63 and the siren 64. One of the buttons 63 is operable to select from unit systems for the value of the torque for example. Another one of the buttons 63 is operable to set a limit for the value of the torque for example.
  • the shell 16 In use, the shell 16, as a ring gear, must be kept in position, i.e., not rotated.
  • a bracket 11 for non-rotationally connecting the shell 16 to a stationary object 13 such as a table.
  • An end 14 of the bracket 11 is connected to the shell 16 via a nut 15.
  • Another end 12 of the bracket 11 is connected to the stationary object 13 by a threaded bolt (not shown).
  • the tongue 22 of the wrench 21 is inserted in the cavity of input element 20.
  • the axle 31 of the output element 30 is inserted in the cavity of the socket 23.
  • the socket 23 is used to receive a nut or a head of a threaded bolt.
  • the wrench 21 is operated to exert torque on the nut or the head of the threaded bolt.
  • the sensor 54 senses the deformation of the axle 31 and accordingly sends an original signal to the circuit board 52. Based on the original signal, the circuit board 52 calculates the value of the torque and instructs the wireless transmitter 55 to transmit a wireless signal.
  • the wireless receiver 61 receives the wireless signal and accordingly sends a secondary signal to the circuit board of the display 60. Based on the secondary signal, the circuit board of the display 60 determines the value of the torque and instructs the screen 62 to show the value of the torque. Moreover, the circuit board of the display 60 actuates the siren 64 when the value of the torque exceeds a predetermined limit set by operating at least one of the buttons 63.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Description

    BACKGROUND OF INVENTION 1. FIELD OF INVENTION
  • The present invention relates to a torque multiplier for a wrench.
    • 2. RELATED PRIOR ART
  • There have been various manual, electric and pneumatic tools for driving fasteners such as threaded bolts and nut for holding components together to form a construction. Each manual, electric or pneumatic tool is designed to provide a certain value of torque.
  • Sometimes, it is necessary to exert on a fastener a value of torque higher than the designed value. In such a case, a torque multiplier can be used together with a manual, electric or pneumatic tool.
  • Torque multipliers can be found in US Patent Nos. 3861244 , 5176047 , 5616095 , 6012359 , 6742417 , 6810571 and 7284463 and Taiwanese Patent No. 195258 and M386143 . A torque multiplier may be designed to provide a ratio such as 5:1 and 15:1 for multiplying the designed value of torque that can be exerted by a manual, electric or pneumatic tool. However, loss of power in the torque multiplier is inevitable, and an actual ratio achievable by the torque multiplier is lower than the designed ratio. Hence, the combination of the manual, electric or pneumatic tool with the torque multiplier fails to provide a multiplied value of torque as desired. Such shortage of torque is dangerous since fasteners might not be tightened enough to hold components together firmly and a structure that consists of the components might collapse. Therefore, the German utility model DE 20 2011 004979 U1 suggests a torque multiplier with detecting the torque including an input element for connection to a tool operable for exerting torque; an output element for connection to an object to be driven by the tool; a multiplying unit for connecting the input element to the output element and turning a lower value of torque at the input element to a higher value of torque at the output element; a measurement unit for measuring the higher value of torque and accordingly sending a signal to a display unit for showing the torque value. However said torque multiplier has a structure which is quite complex in assembly.
  • Accordingly, the present invention is intended to obviate or at least alleviate the problems encountered in prior art.
    • SUMMARY OF INVENTION
  • It is the primary objective of the present invention to provide an improved structure of a torque multiplier capable of showing the value of torque exerted therewith.
  • To achieve the foregoing objective, the torque multiplier is provided having the combined features of claim 1.
  • Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.
    • BRIEF DESCRIPTION OF DRAWINGS
  • The present invention will be described via the detailed illustration of the preferred embodiment referring to the drawings, wherein:
    • FIG. 1 is a side view of a torque multiplier according to the preferred embodiment of the present invention;
    • FIG. 2 is a side view of a system including the torque multiplier shown in FIG 1; and
    • FIG 3 is a cross-sectional view of the torque multiplier of FIG 1.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
  • Referring to FIGS. 1 to 3, there is a torque multiplier 10 according to the preferred embodiment of the present invention. The torque multiplier 10 includes a shell 16, an input element 20, an output element 30, a multiplying unit 40, a measurement unit 50 and a display 60. The shell 16 is used to contain both of the input element 20 and the multiplying unit 40.
  • The input element 20 includes a cavity for receiving a tongue 22 of a wrench 21. The output element 30 includes an axle 31 for insertion in a cavity of a socket 23. The multiplying unit 40 includes an end connected to the input element 20 and another end connected to the output element 30 via an axle 31. The torque measurement unit 50 is attached to the shell 16.
  • The multiplying unit 40 is preferably a planetary gear train. In such a case, the shell 16 is made a ring gear. The multiplying unit 40 will not be further described in detail for being conventional.
  • The measurement unit 50 includes a casing 51, a circuit board 52, a battery 53, a sensor 54, a wireless transmitter 55 and a switch 56. The casing 51 is attached to the axle 31. The casing 51 is used to contain the circuit board 52, the battery 53, the sensor 54 and the wireless transmitter 55. The circuit board 52 is electrically connected to the battery 53, the sensor 54, the wireless transmitter 55 and the switch 56. The battery 53 can be replaced with a new one. The sensor 54 is further connected to the axle 31 so that the sensor 54 senses the deformation of the axle 31 when the torque is transmitted via the axle 31. The sensor 54 is preferably a strain gauge. The switch 56 is operable to turn the measurement unit 50 on or off.
  • The display 60 includes a wireless receiver 61, a screen 62, several buttons 63 and a siren 64. Although not shown, it should be understood that the display 60 includes a circuit board electrically connected to the wireless receiver 61, the screen 62, the buttons 63 and the siren 64. One of the buttons 63 is operable to select from unit systems for the value of the torque for example. Another one of the buttons 63 is operable to set a limit for the value of the torque for example.
  • In use, the shell 16, as a ring gear, must be kept in position, i.e., not rotated. Hence, there is a bracket 11 for non-rotationally connecting the shell 16 to a stationary object 13 such as a table. An end 14 of the bracket 11 is connected to the shell 16 via a nut 15. Another end 12 of the bracket 11 is connected to the stationary object 13 by a threaded bolt (not shown). The tongue 22 of the wrench 21 is inserted in the cavity of input element 20. The axle 31 of the output element 30 is inserted in the cavity of the socket 23. The socket 23 is used to receive a nut or a head of a threaded bolt. The wrench 21 is operated to exert torque on the nut or the head of the threaded bolt.
  • The sensor 54 senses the deformation of the axle 31 and accordingly sends an original signal to the circuit board 52. Based on the original signal, the circuit board 52 calculates the value of the torque and instructs the wireless transmitter 55 to transmit a wireless signal.
  • The wireless receiver 61 receives the wireless signal and accordingly sends a secondary signal to the circuit board of the display 60. Based on the secondary signal, the circuit board of the display 60 determines the value of the torque and instructs the screen 62 to show the value of the torque. Moreover, the circuit board of the display 60 actuates the siren 64 when the value of the torque exceeds a predetermined limit set by operating at least one of the buttons 63.
  • The present invention has been described via the detailed illustration of the preferred embodiment. Those skilled in the art can derive variations from the preferred embodiment without departing from the scope of the present invention. Therefore, the preferred embodiment shall not limit the scope of the present invention defined in the claims.

Claims (5)

  1. A torque multiplier (10) including:
    an input element (20) for connection to a tool operable for exerting torque;
    an output element (30) for connection to an object to be driven by the tool;a multiplying unit (40) for connecting the input element (20) to the output element (30) and turning a lower value of torque at the input element (20) to a higher value of torque at the output element (30);
    an axle (31) being connected to the multiplying unit (40) at an end and connected to the output element (30) at another end;a measurement unit (50) for measuring the higher value of torque and accordingly sending a wireless signal, wherein the measurement unit (50) is connected to the axle (31); and
    a display (60) for receiving the wireless signal and accordingly showing the higher value of torque;
    characterized in that
    the measurement unit (50) includes:
    a casing (51) connected to the axle (31);
    a circuit board (52) placed in the casing (51);
    a sensor (54) electrically connected to the circuit board (52) and connected to the axle (31);
    a wireless transmitter (55) for sending the wireless signal under the control of the circuit board (52); and
    a switch (56) electrically connected to the circuit board (52) and supported on the casing (51).
  2. The torque multiplier (10) according to claim 1, wherein the display (60) includes:
    a wireless receiver (61) for receiving the wireless signal; and
    a screen (62) for showing the higher value of torque based on the wireless signal.
  3. The torque multiplier (10) according to claim 2, wherein the display (60) includes at least one button (63) operable for selecting from several unit systems for the higher value of torque.
  4. The torque multiplier (10) according to claim 2, wherein the display (60) includes a siren (64) for sending warning sound when the higher value of torque reaches a limit.
  5. The torque multiplier (10) according to claim 1, including a shell (16) for containing the input element (20) and the multiplying unit (40).
EP13179662.5A 2013-08-08 2013-08-08 Torque multiplier Active EP2835222B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13179662.5A EP2835222B1 (en) 2013-08-08 2013-08-08 Torque multiplier
PL13179662.5T PL2835222T3 (en) 2013-08-08 2013-08-08 Torque multiplier
ES13179662.5T ES2581928T3 (en) 2013-08-08 2013-08-08 Torque multiplier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13179662.5A EP2835222B1 (en) 2013-08-08 2013-08-08 Torque multiplier

Publications (2)

Publication Number Publication Date
EP2835222A1 EP2835222A1 (en) 2015-02-11
EP2835222B1 true EP2835222B1 (en) 2016-04-27

Family

ID=48918297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13179662.5A Active EP2835222B1 (en) 2013-08-08 2013-08-08 Torque multiplier

Country Status (3)

Country Link
EP (1) EP2835222B1 (en)
ES (1) ES2581928T3 (en)
PL (1) PL2835222T3 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861244A (en) 1973-05-16 1975-01-21 Warren Earl Macdonald Torque multiplier wrench
US5176047A (en) 1992-01-30 1993-01-05 Dawn Bai Tire dismounting tool for large motor vehicles
US5616095A (en) 1995-07-10 1997-04-01 Pruitt; Charles D. Force multiplier tool
US6012359A (en) 1998-08-10 2000-01-11 Lin; Ching Chou Gear transmission cartridge
KR200286609Y1 (en) 2002-06-04 2002-08-22 하용수 a socket wrench
US6810571B1 (en) 2003-07-23 2004-11-02 John K. Junkers Method of tightening and loosening an object
US7284463B2 (en) 2005-08-02 2007-10-23 Great Ideas, Llc Attachment for a socket wrench, and method
TWM386143U (en) 2010-04-06 2010-08-11 Torq Rex Industry Co Ltd Power increasing tool structure
DE102010019792A1 (en) * 2010-05-06 2011-11-10 Lösomat Schraubtechnik Neef Gmbh Device for generating a torque-precise tightening torque for screw connections and method for calibrating such a device
TWM397882U (en) * 2010-08-12 2011-02-11 Legend Lifestyle Products Corp Torque multiplier

Also Published As

Publication number Publication date
EP2835222A1 (en) 2015-02-11
ES2581928T3 (en) 2016-09-08
PL2835222T3 (en) 2016-11-30

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