US2744176A - Switch actuating mechanism for electric tools - Google Patents

Switch actuating mechanism for electric tools Download PDF

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Publication number
US2744176A
US2744176A US475502A US47550254A US2744176A US 2744176 A US2744176 A US 2744176A US 475502 A US475502 A US 475502A US 47550254 A US47550254 A US 47550254A US 2744176 A US2744176 A US 2744176A
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United States
Prior art keywords
lever
trigger
switch
tool
toggle
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US475502A
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English (en)
Inventor
Frank A Kaman
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Thor Power Tool Co
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Thor Power Tool Co
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Priority to US475502A priority Critical patent/US2744176A/en
Priority to GB30752/55A priority patent/GB793573A/en
Priority to DET11573A priority patent/DE1086782B/de
Priority to FR1145192D priority patent/FR1145192A/fr
Priority to CH343478D priority patent/CH343478A/de
Application granted granted Critical
Publication of US2744176A publication Critical patent/US2744176A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
    • H01H9/063—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner enclosing a reversing switch

Definitions

  • This invention relates to a novel switch actuating mechanism for portable electric tools and more particularly to a novel reversing means for such tools.
  • reversible operation of the tool is essential, e. g. in wrenches, nut runners, drills, screw drivers, etc.
  • reversible operation has been provided by a number of different electrical and mechanical schemes but all of them have had disadvantages.
  • one such scheme involves a rotatable ring for shifting the brushes of the tool motor, but this arrangement is not only expensive but is also subject to undesirable breakage.
  • Another arrangement utilizes a separate reversing switch in addition to the usual hand switch for starting and stopping the motor.
  • Such duplicate switch mechanisms lack simplicity bothfrom a structural and operating viewpoint.
  • Reversing switches have also been provided which are operated by triggers, but these have lacked the desired degree of snnplicity of operation since they usually require movement or positioning of the trigger in a different manner for each direction of operation of the tool.
  • a primary object of the present invention is to provide a novel and improved switch actuating mechanism for controlling the operation of portable electric tools.
  • a further object of the invention is to provide a novel trigger actuated reversing and control switch mechanism adapted to be mounted within the handle structure of a portable electric tool.
  • Another object of the invention is to provide novel switch actuating mechanism for portable electric tools whereby starting, stopping, and reversing of the motor can be accomplished by the use of only one hand of the operator.
  • Still another object of the invention is to provide a novel trigger actuated mechanism of the above mentioned character in which starting and stopping of the motor is effected by depressing the trigger in the same manner for either direction of operation of the tool.
  • An additional object of the invention is to provide a novel reversing means for portable electric tools which is characterized by a high degree of simplicity of construction and operation, low manufacturing cost, and excellent durability.
  • Fig. l is a small scale side elevational view of a portable electric tool embodying the features of the present invention.
  • Fig. 2 is an end elevational view as seen from the left in Fig. 1;
  • Fig. 3 is an enlarged vertical sectional view taken along the line 3-3 of Fig. 2 and showing the switch mechanism of the tool in off position;
  • Fig. 4 is a fragmentary horizontal sectional view as seen along the line 4-4 of Fig. 3;
  • FIG. 5 is a fragmentary vertical sectional view as taken along the line 5-5 of Fig. 3;
  • Fig. 6 is a fragmentary view similar to Fig. 3 but showing the switch mechanism in one of its on positions for operation of the tool in one direction;
  • Fig. 7 is a vertical sectional view taken along the line "-7 of Fig. 6;
  • FIG. 8 is a view similar to Fig. 6 but showing the switch mechanism in the other of its on positions for operation of the tool in the opposite direction;
  • Fig. 9 is a vertical sectional view taken along the line 9-9 of Fig. 8;
  • Fig. 10 is a horizontal sectional view taken along the line 10-10 of Fig. 8;
  • Fig. 11 is a fragmentary side elevational view of the handle and trigger portion of a modified form of the invention having a locking means for releasably holding the trigger in depressed position;
  • Fig. 12 is a horizontal sectional view taken along the line 12-42 of Fig. 11 and showing the locking means in its normal released position;
  • Fig. 13 is a view similar to Fig. 12 but showing the locking means in engaged position
  • Fig. 14 is a view similar to Fig. 6 but showing a further modification of the invention.
  • a portable electric impact tool including an impact unit 15 at the forward end of the tool and an electric motor section 16 at the rear end of the tool.
  • a rotary spindle 17 which is driven by the impact unit 15 projects forwardly from the latter for mounting a suitable tool member such as a nut or bolt engaging socket (not snown).
  • a handle 18 of the pistol grip type having a depressible trigger 19 which is adapted to cooperate with a switch mechanism within the handle 18 for controlling the operation of'the electric motor, as hereinafter described in detail.
  • the pistol grip handle 18 has a hollow two part construction for enclosing the switch and switch actuating mechanism.
  • I provide an elongated one piece bracket or support designated generally at 21 and including a generally upright fiat strip or body portion 22 which is rigidly secured to the outer wall of the handle portion 18, as by screws 23.
  • a lateral flange or shelf 24 extends outwardly from the lower end of the strip 22 and has rigidly mounted thereon, as by lock nuts 26, an electric switch 27.
  • the characteristics of the switch 27 may vary dependent upon the operating characteristics desired in the particular tool involved, the preferred type of switch for reversible operation of the tool is a small fast acting switch of the double pole,
  • the switch 27 shown herein is of the latter type and has an operating member or toggle 28 extending upwardly from the flange 24.
  • the switch 27 also has a plurality of terminals 29 to which the usual wires or conductors 31 are connected, the latter entering the bottom end of the handle 18 through a cable connector 32.
  • the upper end of the bracket 21 is formed with a laterally extending end wall 33 and an outermost depending flange portion 34 which extends in parallel spaced relation with respect to the upright body or strip portion 22 of the bracket.
  • the trigger 19 is pivotally mounted at the upper end of the bracket 21 by means of a pivot pin 36 extending between the parallel bracket portions 22 and 34.
  • the trigger 19 projects forwardly through an opening 37 in the forward edge of the handle 18 and is pivotally depressible for operating the switch mechanism.
  • an actuating lever designated generally at 38, which is likewise pivotally supported adjacent the upper end of the bracket 21 by a pivot means 39 extending between the portions 22 and 34 of the bracket rearwardly of the trigger pivot 36 and on an axis parallel therewith.
  • the lower end of the lever 33 is bifurcated, as at 41, for operably receiving and engaging the switch toggle 28.
  • pivot lever 38 is also shiftable laterally or transversely of its plane of pivotal movement for selectively coacting in a different manner with the trigger 19 in each of the opposite transverse positions of the lever 33.
  • the pivot means 33 for the lever 38 is in the form of an axially shiftable pivot pin or plunger which in this instance has a multiple part construction.
  • the pivot means 39 has a plunger or pin portion 42 with a reduced diameter end 43 and a complementary plunger or cap portion 44, the two portions being frictionally interconnected by means of a lock pin 46 having a tight fit in aligned axial bores provided in the respective plunger portions 42 and 44.
  • the upper end of the lever 33 is formed with an aperture 47 into which the reduced end 43 of the plunger portion 42 is loosely fitted to permit pivotal or rockable movement of the lever 38 thereon.
  • the lever 38 is retained on its opposite side by the plunger portion 44 and the enlarged diameter part of the plunger portion 42 so that the pivot means 39 and the lever 33 are shiftable transversely as a unit.
  • the plunger portions 42 and 44 are slidably supported in suitable aligned apertures in the bracket walls 22 and 34, and the opposite extremities of the plunger portions extend outwardly through slightly enlarged openings 48 in the opposite walls of the hollow handle 18.
  • One wall of the handle is countersunk, as at 48' (Fig. 7), and the opposite wall is formed with a shoulder 51' below the plunger and a recess 50 above the plunger so that the ends of the plunger are protected against inadvertent shifting.
  • the shiftable plunger within the countersunk recess 48 can be actuated by the operators forefinger while the opposite end of the plunger above the shoulder 53 can be reached by the joint of the operators thumb for shifting the plunger as required to effect reversible operation.
  • the upper end portion of the lever 38 has a slight protuberance or bump 49 which cooperates with a spring pressed detent 51 having a casing 52 rigidly mounted in the upper end wall 33 of the supporting bracket 2i.
  • the detent 51 coacts with the protuberance 49 to hold the lever and plunger assembly in either of its transverse positions (Figs. 7 and 9) but is at the same time releasable upon application of axial shifting pressure to the plunger for permitting movement of the same.
  • the trigger 19 has a generally U-shaped transverse cross-section so as to provide a pair of parallel laterally spaced side walls 53 which are connected at their forward edges by an end wall portion 54, the latter continuing between the side walls 53 along the bottom edges thereof and forming an abutment or stop 56 at the lower inner corner of the trigger 19.
  • the depressible trigger 19 is held in outwardly projected relation through the handle aperture 37 by means of a spring 57 which in this instance is coiled around the pivot pin 36 and coacts at its terminal ends with the bracket upper wall 33 and the forward edge wall 54 of the trigger.
  • the stop or abutment portion 56 on the trigger seats against the forward edge wall of the handle 13 adjacent the opening 37 to limit the extent of outward projection of the trigger whereby to maintain the same in readily accessible position.
  • the side walls 53 are open and unconnected so as to provide a pair of spaced parallel rear edges adjacent the opposite side walls of the handle 18 (Fig. 5). These rear edges of the walls 53 are formed with suitable cam surfaces and abutments for selective coaction with the pivot lever 38 in the opposite transverse positions of the latter.
  • one of the trigger edges 53 is formed with a lower cam portion 58 and directly thereabove an upper abutment or stop portion 59.
  • the opposite trigger edge is formed with an uppermost cam projection 61 and directly therebelow a lower abutment or stop portion 62.
  • the lever 38 has angularly extending arm portions 63 and 64 with the pivotal mounting aperture 47 being disposed therebetween so that the lever 33 is mounted in generally the same manner as a bell crank in this instance (Figs. 3, 6, and 8).
  • the arm portions 63 and 64 of the lever 38 have a relatively restricted width in the direction of the pivot axis, whereas the lowermost bifurcated end 41 of the lever arm 64 has a narrow forward leg 66 and a rear leg 67 which is substantially wider or laterally extended with the result that in either of the transverse positions of the lever 38 (Figs. 7 and 9) the bifurcated portion 41 is always in actuating engagement with the toggle 28.
  • the narrow transverse width of the lever arms 63 and 64 make possible selective registry and coacting engagement of the lever 38 with only one or the other of the actuating rear edge portions 53 of the trigger 19, dependent upon the transverse position of the lever 38. This feature will be more fully expalined in connection with the following description of the operation of the device.
  • Figs. 6 and 7 illustrate the actuation of the switch mechanism for one direction of operation of the tool, which for the sake of convenience will be considered as the forward operating direction.
  • the shiftable plunger means 3% and the lever 33 rockably supported thereon are displaced to the left, as seen in Fig. 7, with the protuberance 49 being releasably engaged by the detent 51 for retaining the lever 38 in the left-hand position.
  • the lever 38 is in register only with the left-hand rear edge 53 of the trigger 19. Consequently, when the operator depresses the trigger 19 by finger pressure in the usual manner, only the lower cam portion 53 and the upper abutmeat 59 will be in operating relation with the lever 38.
  • Fig. 6 and 7 illustrate the actuation of the switch mechanism for one direction of operation of the tool, which for the sake of convenience will be considered as the forward operating direction.
  • the shiftable plunger means 3% and the lever 33 rockably supported thereon are displaced to the left, as seen in Fig. 7, with the protuberance 49 being
  • depression of the trigger 19 brings the lower cam portion 53 into direct engagement with the forward leg 66 of the bifurcated end 4. of the lever the eby pivoting the latter in a counterclockwise direction, as seen in Fig. 6, and moving the switch toggle 23 rearwardly whereby to complete the electrical circuit of the tool for forward operation thereof.
  • the angularly extending lever arm 63 pivots downwardly and engages the upper trig er abutment 53 so as to limit the extent of pivotal movement of the lever 33, thereby protecting the switch 27 from damage due to over-tra el of the toggle 28. Because of the leftward transverse position of the lever 38 as seen in Fig. 7, trigger portions 61 and 62 clear the lever 38 during inward depression of the trigger.
  • the switch 27 is preferably of the internal spring return type with momentary on positions in either direction of ration of the tool. Consequently, the operating condition shown in Figs. 6 and 7 will continue as long as pressure is maintained on the trigger 19, but as soon as the trigger pressure is released the internal spring action of the switch 27 will cause the toggle 2'3 and the interengaged lever 3% to return to the neutral or off position shown in Fig. 3. Of course, the spring 57 will return the trigger 19 to its Fig. 3 position in which it is completely disengaged from the lever 33 in order to facilitate free shifting of the latter.
  • the tr' is again depressed by the operator as shown in in this case, however, the upper cam portion 61 of the trigger 19" directly engages the lever arm 63 and pivots the lever in a clockwise direction, as seen in Pig. 8, so that the laterally widened rear leg 6'7 of the bifurcated lower end of the lever engages the toggle and shifts the latter forwardly for completing the reverse operating circuit in the tool.
  • the switch 27 is again protected against over-travel of the toggle 28 by engagement of the forward leg 66 on the lower end of the lever with the abutment 62 on the trigger.
  • the trigger portions 58 and 59 at the left-hand rear edge 53 of the trigger clear the lever 38 because of the right-hand transverse location of the latter.
  • the rear leg portion 67 of the bifurcated end of the lever is wide enough to insure engagement with the toggle 2fin the right-hand Fig. 9 position of the lever 3-2 but the forward leg 66 is sufi'iciently narrow so that the trigger portion 58 does not engage the lever 33 during the Fig. 8 reverse operation of the tool.
  • the operating condition of Fig. 8 is maintained only as long as finger pressure is held against the trigger 19 and upon release of the trigger the internal spring return of the switch 27 automatically restores the mechanism to the Pig. 3 off position.
  • Figs. ll, 12, and 13 I have shown a modification wherein temporary locltint means is provided for holding the trigger 19 in depressed relation without prolonged finger pressure.
  • the locking means is in the form of a releasable spring pressed detent mounted in the handle 1% adjacent the trig er 19.
  • the wall portion of the handle is provided with a bos 63 having a recess 6%) with an internal shoulder or restriction 71.
  • a lock pin '72 is disposed for axial movement within the recess 69 and carries an outermost cup-shaped button or cap 7 3.
  • the inner end of the lock pin 72 has an enlarged flange or head portion 74- which is normally held in seated relation against the shoulder 71 by the action of a spring 76 which surrounds the lock pin 72 and coacts between the shoulder '71 and the button '73.
  • the lock pin 72 is normally held in outwardly projected position as seen in 12, and in this position the lock pin head '74 is recessed within a depression 77 so that there is no interference with pivotal movement of the trigger 19.
  • the button 73 is pressed inwardly while the trigger 19 is depressed whereby to project the lock pin head 74 through a slightly larger aperture '78 in the adjacent side wall 53 of the trigger 19. Then, while the lock pin is still held in inwardly depressed position, finger pressure of the trigger 19 is released slightly to allow the trigger 19 to make a slight return movement thereby permitting the lock pin 72 to abut against the side edge of the trigger opening 78 with the head portion 74 seating against the inside of the trigger wall 53 upon release of inward pressure on the loci; pin. Thus, the trigger 19 is held in depressed position as shown in 13.
  • Operation of the tool can thereafter be stopped by effectin slight depression of the trigger 19 sufficient to register the trigger opening 78 with the lock pin head 74 whereupon the spring '76 automatically retracts the lock pin assembly to its Fig. 12 position and further release of the trigger 19 causes the switch mechanism to be returned automatically to the Fig. 3 oil position.
  • Fig. 14 still another modification is shown wherein the switch, designated at 79, is of the same general double pole, double throw type as hereinbefore described except that it does not have an internal spring return.
  • the switch 79 has a toggle S1 with three positions as before but each of the positions is a set position so that there is no momentary on condition for each direction of operation.
  • an external spring member 82 is provided in order to provide the same general operation hereinbefore described.
  • the spring member 82 has a central portion 33 rigidly mounted on the switch and a pair of upwardly and inwardly extending resilient end portions 84 which bear against opposite sides of the toggle 81 for spring loading the latter in both directions of operation. It will be evident without further description that the action of the return spring 82 provides sufiicient force to return the toggle 31 to its neutral or oil position upon release of finger pressure from the trigger 19.
  • my invention provides an exceedingly simple switch actuating mechanism for controlling starting, stopping and reversal of an electric tool.
  • the structure is economical to manufacture and is sufficiently compact to be located entirely in the handle portion of the tool.
  • the arrangement is quite durable and rugged so as to withstand the severe usage encountered in the tools of this type.
  • a further important advantage of the invention is found in the ease and simplicity with which the reversing operation can be carried out.
  • the reversing element is located closely adjacent the tool trigger so that only a single hand of the operator is required for complete control of the tool. Moreover, the operation of the trigger is always the same for either direction of the tool.
  • the invention utilizes a double pole, double throw electric switch to obtain reversible operation of the tool.
  • an important advantage of the invention resides in the fact that the same switch actuating mechanism can be used for non-reversible operation of the tool merely by changing the switch 27.
  • Switch actuating mechanism for an electric tool having a reversing switch including a pivotal operating member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a depressible trigger, a lever pivotally mounted adjacent said trigger and engageable with the switch operating member for moving the latter in either direction in response to depression of the trigger, and shiftable means for bodily moving said lever transversely to the plane of pivotal movement thereof, said trigger and said lever having coacting portions selectively engageable for pivoting said lever in opposite directions corresponding to opposite transverse positions of said lever.
  • Switch actuatin mechanism for an electric tool having a reversing switch including a pivotal operating member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a depressible trigger, a lever adjacent said trigger and engageable with the switch operating member for moving the latter in either direction in response to depression of the trigger, and a laterally shiftable pivot having said lever pivotally supported thereon, said lever being shitable back and forthwith said pivot transversely to the plane of pivotal movement of the lever, and said trigger and said lever having coacting portions selectively engageable for pivoting said lever in opposite directions corresponding to opposite transverse positions of said pivot.
  • Switch actuating mechanism for an electric tool having a hollow handle portion with a reversing switch including a toggle member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a pair of coacting trigger and lever members pivotally mountable within the handle portion of the tool with the lever member engageable with the switch toggle member for moving the latter in either direction in response to actuation of the trigger, and shifta'ole means for moving the lever member transversely to the plane of pivotal movement thereof, said trigger and lever members having coacting cam portions selectively engageable in different transverse positions of the lever member for pivoting said lever member in opposite directions whereby to effect forward or reverse operation of the tool.
  • the device of claim 3 further characterized in that said trigger member is provided with spring means normally urging the trigger member outwardly for projecting the same from the handle portion in readily accessible depressible position and in disengaged relation with respect to said lever member.
  • Switch actuating mechanism for an electric tool having a hollow handle portion with a reversing switch including a toggle member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a support rigidly mountable within the handle portion, a trigger pivotally mounted on said support and adapted to project from the handle portion in depressible relation, a lever pivotally mounted on said support adjacent said trigger for pivotal movementabout an axis parallel to the pivot axis of the trigger, said lever being engageable with the switch toggle member for moving the latter in either direction in response to depression of the trigger, and pivot means shiftably mounted on said support and pivotally carrying said lever, said pivot means and the lever carried thereon being shiftable transversely relative to said trigger and to the plane of pivotal movement of the lever, and said trigger and said lever having co-acting portions selectively engageable in different transverse positions of the lever for pivoting the lever in opposite directions whereby to effect forward or reverse operation. of the tool.
  • Switch actuating mechanism for an electric tool having a hollow handle portion with a reversing switch including a toggle member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising an elongated bracket having a mounting portion adapted to'be rigidly fastened within the handle portion, flange at one end of said bracket for rigidly supporting the switch, a trigger pivotally mounted at the opposite end of said bracket, a iever pivotally mounted adjacent said trigger at said opposite end of said bracket and engageable with the switch toggle member for moving the latter in either direction in response to depression of the trigger, and laterally shiftable pivot means slidably supported in said bracket at said opposite end thereof and pivotally carrying said lever, said pivot means and the lever carried thereon being shiftable Lil 3? transversely relative to said trigger and to the plane of pivotal movement of the lever, and said trigger and said lever having coacting portions selectively engageable in different transverse positions of the lever for pivoting the lever in opposite directions whereby to effect forward or reverse operation of the tool.
  • a switch mechanism comprising elongated bracket rigidly mounted within said handle portion, a reversing switch rigidly supported at one end of said bracket and having a toggle operating member extending therefrom and movable in opposite directions for iorward and reverse operation of the tool, a pair of coacting trigger and lever members pivotally supported at the opposite end of said bracket with the lever member extending into operating engagement with said toggle member for moving the latter in either direction in response to actuation of the trigger member, and laterally shiftable pivot means slidably suppor in said bracket at said opposite end thereof and pivotally c ing said lever member, said pivot means and the lever memb r carried thereon being shiftable transversely relative to said trigger memher and to the plane of pivotal movement of the lever member, and said trigger and l-ver members having coacting portions selectively engageable in different transverse positions of the lever member for pivoting the latter in opposite directions whereby to effect forward or reverse operation of the tool.
  • Switch actuating mechanism for an electric tool having a reversing switch including a pivotal operating member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a depressible trigger, an actuating lever in coacting position adjacent said trigger and having a pair of angularly extending arm portions, pivot means swin ably supporting the lever between said arm portions, one of said arm portions being engageable with the switch operating member for moving the latter in either direction in response to depression of the trigger, and means provid- Eng lateral shifting movement of said pivot means whereby said lever is shiftable transversely to the plane of pivotal movement thereof, said trigger having ccacting abutment surfaces selectively engageabl opposite transverse positions of the lever with one or the other of said arm portions for pivoting the lever in opposite directions whereby to elfect forward or reverse operation of the tool.
  • the device of claim 8 further characterized in that said one arm portion of lever has a bifurcated end portion adapted to fit over the switch operating member for moving the latter in either direction, said bifurcated end portion being engageable with the switch operating member in all transverse positions of said lever.
  • Switch actuating mechanism for an electric tool having a reversing switch includin a pivotal operating member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a depressible trigger, a lever adjacent said trigger and engageable with the switch operating member for moving the latter in either direction in response to depression of the trigger, a later lly shiftable pivot having said lever pivctally supported thereon, said lever being shiftable back and forth with said pivot transversely to the plane of pivotal movement of the lever, and means operably coacting with said lever for releasably holding the lever in either of its transverse positions, said trigger and said lever having coacting portions selectively engageable for pivoting the lever in opposite directions corresponding to opposite transverse positions of said pivot.
  • the device of claim 5 further characterized in that said support also has mounted thereon adjacent said pivot means a spring pressed detent operatively coacting with said lever for releasably holding the lever in either of its transverse positions.
  • the device of claim 2 further characterized in that said pivot comprises a pair of axially connected pin and cap members slidably supported for axial shifting movement and pivotally carrying said lever therebetween.
  • Switch actuating mechanism for an electric tool having a hollow handle portion with a reversing switch including a toggle member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a pair of coacting trigger and lever members pivotally mountable within the handle portion of the tool with the lever member engageable with the switch toggle member for moving the latter in either direction in response to actuation of the trigger, and elongated pivot means slidably mounted for lateral shifting movement and adapted to extend through the opposite walls of the handle portion, said pivot means having said lever member pivotally supported thereon and being shiftable with said lever member transversely to the plane of pivotal movement of the lever member, said trigger and lever members having coacting portions selectively engagcable in different transverse positions or" the lever member for pivoting said lever member in opposite directions whereby to effect forward or reverse operation of the tool.
  • Switch actuating mechanism for an electric tool having a reversing switch including a pivotal operating member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a depressible trigger, a lever pivotally mounted adjacent said trigger and engageable with the switch operating member for moving the latter in either direction in response to depression of the trigger, and shiftable means for bodily moving said lever transversely to the plane of pivotal movement thereof, said trigger having a pair of laterally spaced cam portions selectively engageable with different portions of said lever, one of said cam portions being engageable with one portion of said lever in one transverse position thereof for pivoting the lever in one direction and the other of said cam portions being engageable with another portion of said lever the opposite transverse position thereof for pivoting lever in the opposite direction.
  • Switch actuating mechanism for an electric tool having a reversing switch including a pivotal operating member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a depressible trigger, a lever pivotally mounted adjacent said trigger and engageable with the switch operating member for moving the latter in either direction in response to depression of the trigger, and shiftable means for bodily moving said lever transversely to the plane of pivotal movement thereof, said lever having upper and lower actuating portions for rotating the lever in opposite directions and said trigger having coacting upper and lower cam portions and upper and lower abutments selectively engageable with the actuating portions of said lever, said cam portions and said abutments being laterally arranged so that in one transverse position of said lever said lower cam portion of the trigger registers with and engages the lower actuating portion of the lever for pivoting the lever in one direction with the upper abutment on the trigger being engageable by the upper actuating portion of the lever for limiting the extent of pivotal movement of the lever in said one direction and in the other transverse
  • Switch actuating mechanism for an electric tool having a reversing switch including a pivotal operating member movable in opposite directions for forward and reverse operation of the tool, said mechanism comprising a depressible trigger, a lever pivotally mounted adjacent said trigger and engageable with the switch operating member for moving the latter in either direction in response to depression of the trigger, and shiftable means for bodily moving said lever transversely to the plane of pivotal movement thereof, said trigger and said lever having coacting portions selectively registrable and engageable in opposite transverse positions of said lever for pivoting the lever in opposite directions, and said trigger and said lever also having coacting abutment means for limiting the extent of pivotal movement of the lever in either direction whereby to protect the switch from damage due to over-travel of the switch operating member.
  • a reversing switch mounted in said handle portion and having a toggle operating member shiftable from forward to off to reverse positions and vice versa, spring means normally returning said toggle from forward or reverse positions to off position, a depressible trigger operably mounted in said handle portion, a lever pivotally mounted in said handle portion adjacent said trigger and engaging said toggle for moving the latter to either forward or reverse position in response to depression of the trigger, and shiftable means for moving said lever transversely to the plane of pivotal movement thereof, said trigger and said lever having coacting portions selectively registrable and engageable in opposite transverse positions of said lever for pivoting the lever in opposite directions, and said lever and said trigger being automatically returnable to neutral position by the action of said spring means on said toggle upon release of said trigger.
  • the device of claim 17 further characterized in that releasable locking means is provided coacting between said handle portion and said trigger for holding the latter in depressed position.
  • an electric tool having a hollow handle portion, a reversing switch mounted in the handle portion, a toggle operating member on said switch, a transversely shiftable actuating lever in pivotal engagement with said toggle for movement thereof in forward or reverse directions, and a depressible trigger carried by said handle portion and engageable with said lever in opposite transverse positions of the latter for effecting pivotal movement of the lever in opposite directions whereby said tool is reversible by transverse shifting of said lever.
  • Switch actuating mechanism for an electric tool having a reversing switch including a switch operating member movable to a first position for forward operation of the tool and movable to a second position for reverse operation thereof, said mechanism comprising a depressible trigger, a movable actuating element mounted adjacent said trigger and engageable with the switch operating member for moving the latter either to its first position or to its second position in response to depression of the trigger, and shiftable means for bodily moving said actuating element transversely to the direction of its switch actuating movement, said trigger and said actuating element having coacting portions selectively engageable for movement of the switch operating member to its first or second positions corresponding to opposite transverse positions of said actuating element.

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  • Portable Nailing Machines And Staplers (AREA)
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  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US475502A 1954-12-15 1954-12-15 Switch actuating mechanism for electric tools Expired - Lifetime US2744176A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US475502A US2744176A (en) 1954-12-15 1954-12-15 Switch actuating mechanism for electric tools
GB30752/55A GB793573A (en) 1954-12-15 1955-10-27 Improvements in or relating to switch actuating mechanism for an electric tool
DET11573A DE1086782B (de) 1954-12-15 1955-11-14 Fuer ein elektrisches Werkzeug bestimmter Schalterantriebsmechanismus
FR1145192D FR1145192A (fr) 1954-12-15 1955-11-15 Perfectionnements apportés aux mécanismes de manoeuvre du commutateur des outils électriques
CH343478D CH343478A (de) 1954-12-15 1955-11-16 An einem elektrischen Handwerkzeug angeordnete Schalterantriebsvorrichtung

Applications Claiming Priority (1)

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US475502A US2744176A (en) 1954-12-15 1954-12-15 Switch actuating mechanism for electric tools

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US2744176A true US2744176A (en) 1956-05-01

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US (1) US2744176A (de)
CH (1) CH343478A (de)
DE (1) DE1086782B (de)
FR (1) FR1145192A (de)
GB (1) GB793573A (de)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2916031A (en) * 1955-11-17 1959-12-08 John B Parsons Reverse gear operating system for marine engines
US2922012A (en) * 1957-11-22 1960-01-19 Pass & Seymour Inc Switch trigger locking pin
US3138689A (en) * 1959-11-02 1964-06-23 Cutler Hammer Inc Manually operated trigger switch for rotatable electric tools
US3177424A (en) * 1960-06-21 1965-04-06 Nicholas P Fatse Breaker point adjustment tool comprising screwdriver probe with coaxial switch
US3213305A (en) * 1962-03-05 1965-10-19 Black & Decker Mfg Co Heavy-duty industrial-type battery powered electric drill
US3260827A (en) * 1965-07-12 1966-07-12 Skil Corp Motor reversing mechanism for electrically powered portable tools
US3352368A (en) * 1965-08-30 1967-11-14 Black & Decker Mfg Co Pivoted trigger means for power-operated reversible tool
US3376402A (en) * 1967-09-25 1968-04-02 Black & Decker Mfg Co Reversible electric switch with laterally extending reversing member for use in portable electric tool or appliance
US3381104A (en) * 1966-08-29 1968-04-30 Black & Decker Mfg Co Handle and trigger construction for one-hand portable tool
US3383943A (en) * 1966-07-08 1968-05-21 Cutler Hammer Inc All-speed lever lock
US3422296A (en) * 1967-01-03 1969-01-14 Emerson Electric Co Interlock reversing switch
US3447577A (en) * 1966-06-13 1969-06-03 Stanley Works Circular trim saw
US3511951A (en) * 1968-02-12 1970-05-12 Robert G Miller Hand-held switching device with interlocked trigger actuating means
US4054766A (en) * 1976-01-15 1977-10-18 Rockwell International Corporation Portable tool switch structure
DE2631994A1 (de) * 1976-07-16 1978-01-19 Metabowerke Kg Handwerkzeug mit einer von einem motor angetriebenen antriebsspindel
US4132933A (en) * 1976-12-23 1979-01-02 Cutler-Hammer, Inc. Electromechanical chopper for speed control of battery powered devices
US4588910A (en) * 1983-11-24 1986-05-13 Black & Decker Inc. Reversing switch arrangement for an electric tool
US4922069A (en) * 1988-09-07 1990-05-01 Aircap Industries Corporation Electrical control switch mechanism
US6969811B1 (en) * 2004-08-31 2005-11-29 Li-Chun Lai Foot switch structure of extension cord receptacle
US20130221061A1 (en) * 2006-05-19 2013-08-29 Ethicon Endo-Surgery, Inc. Active braking electrical surgical instrument and method for braking such an instrument
US10314592B2 (en) 2006-05-19 2019-06-11 Ethicon Llc Electrically self-powered surgical instrument with cryptographic identification of interchangeable part
US11172930B2 (en) 2005-07-26 2021-11-16 Cilag Gmbh International Electrically self-powered surgical instrument with manual release
US11751873B2 (en) 2005-07-26 2023-09-12 Cilag Gmbh International Electrically powered surgical instrument with manual release
US12009166B2 (en) 2006-05-19 2024-06-11 Cilag Gmbh International Force switch
US12059150B2 (en) 2005-07-26 2024-08-13 Cilag Gmbh International Surgical stapling and cutting device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWM297820U (en) * 2006-02-15 2006-09-21 Tranmax Machinery Co Ltd Open circuit controller of electric ratchet wrench

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US1929662A (en) * 1930-08-16 1933-10-10 Wappat Inc Motor driven tool switch
DE605392C (de) * 1933-09-01 1934-11-09 Siemens Schuckertwerke Akt Ges Schalter mit geradlinig bewegtem Schaltorgan fuer das Schalten mehrerer Stromkreise in einer vorbestimmten Reihenfolge

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Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2916031A (en) * 1955-11-17 1959-12-08 John B Parsons Reverse gear operating system for marine engines
US2922012A (en) * 1957-11-22 1960-01-19 Pass & Seymour Inc Switch trigger locking pin
US3138689A (en) * 1959-11-02 1964-06-23 Cutler Hammer Inc Manually operated trigger switch for rotatable electric tools
US3177424A (en) * 1960-06-21 1965-04-06 Nicholas P Fatse Breaker point adjustment tool comprising screwdriver probe with coaxial switch
US3213305A (en) * 1962-03-05 1965-10-19 Black & Decker Mfg Co Heavy-duty industrial-type battery powered electric drill
US3260827A (en) * 1965-07-12 1966-07-12 Skil Corp Motor reversing mechanism for electrically powered portable tools
US3352368A (en) * 1965-08-30 1967-11-14 Black & Decker Mfg Co Pivoted trigger means for power-operated reversible tool
US3447577A (en) * 1966-06-13 1969-06-03 Stanley Works Circular trim saw
US3383943A (en) * 1966-07-08 1968-05-21 Cutler Hammer Inc All-speed lever lock
US3381104A (en) * 1966-08-29 1968-04-30 Black & Decker Mfg Co Handle and trigger construction for one-hand portable tool
US3422296A (en) * 1967-01-03 1969-01-14 Emerson Electric Co Interlock reversing switch
US3376402A (en) * 1967-09-25 1968-04-02 Black & Decker Mfg Co Reversible electric switch with laterally extending reversing member for use in portable electric tool or appliance
US3511951A (en) * 1968-02-12 1970-05-12 Robert G Miller Hand-held switching device with interlocked trigger actuating means
US4054766A (en) * 1976-01-15 1977-10-18 Rockwell International Corporation Portable tool switch structure
DE2631994A1 (de) * 1976-07-16 1978-01-19 Metabowerke Kg Handwerkzeug mit einer von einem motor angetriebenen antriebsspindel
US4132933A (en) * 1976-12-23 1979-01-02 Cutler-Hammer, Inc. Electromechanical chopper for speed control of battery powered devices
US4588910A (en) * 1983-11-24 1986-05-13 Black & Decker Inc. Reversing switch arrangement for an electric tool
US4922069A (en) * 1988-09-07 1990-05-01 Aircap Industries Corporation Electrical control switch mechanism
US6969811B1 (en) * 2004-08-31 2005-11-29 Li-Chun Lai Foot switch structure of extension cord receptacle
US11172930B2 (en) 2005-07-26 2021-11-16 Cilag Gmbh International Electrically self-powered surgical instrument with manual release
US12059150B2 (en) 2005-07-26 2024-08-13 Cilag Gmbh International Surgical stapling and cutting device
US11751873B2 (en) 2005-07-26 2023-09-12 Cilag Gmbh International Electrically powered surgical instrument with manual release
US20130221061A1 (en) * 2006-05-19 2013-08-29 Ethicon Endo-Surgery, Inc. Active braking electrical surgical instrument and method for braking such an instrument
US10675022B2 (en) 2006-05-19 2020-06-09 Ethicon Llc Electrical surgical instrument with optimal tissue compression
US11172931B2 (en) 2006-05-19 2021-11-16 Cilag Gmbh International Electrically self-powered surgical instrument with cryptographic identification of interchangeable part
US10314592B2 (en) 2006-05-19 2019-06-11 Ethicon Llc Electrically self-powered surgical instrument with cryptographic identification of interchangeable part
US11759203B2 (en) 2006-05-19 2023-09-19 Cilag Gmbh International Electrical surgical instrument with minimum closure distance for staple firing control
US11974745B2 (en) 2006-05-19 2024-05-07 Cilag Gmbh International Electrically self-powered surgical instrument with cryptographic identification of interchangeable part
US12009166B2 (en) 2006-05-19 2024-06-11 Cilag Gmbh International Force switch
US9901340B2 (en) * 2006-05-19 2018-02-27 Ethicon Endo-Surgery, Inc. Active braking electrical surgical instrument and method for braking such an instrument
US12096933B2 (en) 2006-05-19 2024-09-24 Cllag GmbH International Electrical surgical instrument with differential rate of closing motion speed

Also Published As

Publication number Publication date
CH343478A (de) 1959-12-31
DE1086782B (de) 1960-08-11
FR1145192A (fr) 1957-10-23
GB793573A (en) 1958-04-16

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