DE1628052A1 - Hand tool with a pressurized drive motor - Google Patents

Description

Case No. 4A. .

U.S. Serial No. 569 540

Piled: 1st August 1966 '\

NEW DRAULICS ING,
960 West 17βΟ South., Salt Lake City, Utah (V.St.A.)

Hand tool with a pressure-actuated drive motor . ■ ~ - '

The invention relates to a hand tool with a pressure medium-operated drive motor and a control valve, which controls the flow of pressure medium between a pressure medium inlet and outlet and the drive motor.

The invention is applicable to tools of the various

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The most diverse types can be used, e.g. tools that are provided with a / piston-containing, pressure medium-operated drive motor, such as pruning shears, or tools that are operated by a rotating fluid motor are driven, such as e.g. chainsaws and impact wrenches. '

According to the invention, the control valve a valve housing with an opening in which a valve

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body is mounted, which has a bore that receives a movable valve element and Outlet opening in the valve body with the pressure medium inlet or -outlet-connected-. The valve element is through one of Hand operated actuating device between a rest position in which the drive motor via the bore with. the outlet opening is in communication, and an operative position in which the outlet opening through the valve element is closed, adjustable.

The valve can be designed in a wide variety of ways. In one embodiment, the valve body has a third opening which forms the bore with the drive motor connects, and the valve element, which has the shape of a thread bobbin, connects the inlet opening in the working position and the third opening, and in the rest position the third opening with the outlet opening. The outlet opening may and preferably be formed through one end of the bore the valve housing at this end of the bore has a chamber which is passed through a channel in the outer surface the valve body is connected to the pressure medium outlet,

In another embodiment, there is the rest position of the valve element a connection between the inlet and outlet ports through the bore so that a Webenschlußweg is formed, through which the pressure medium under Bypassing the drive motor can circulate while the

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Valve element in its working position at least the The outlet opening is closed, see above that the motor is pressurized is applied and drives the tool. At this Embodiment is one in the opening in the valve housing Pressure chamber formed, the. a surface of the valve element exposed, and the valve body is shaped so that that it establishes a connection between the inlet port and the pressure chamber when the valve element is in the Working position is, the valve element is pressed into the rest position. In this "way, the Valve element without the use of springs or the like. Under Exploitation of the pressure medium driving the drive motor exerts a bias which pushes it into the rest position strives. The valve element can be used to control circulating or reciprocating drive motors can be used and allows a gentle, practical. Vibration-free Control of the engine and a virtually instantaneous and kickback free Stopping the motor without the need for a special braking mechanism.

The connection between the inlet port

and the pressure chamber is preferably carried out through the inlet opening, and the outlet opening is axially in front of the bore.

preferably arranged so that the outlet opening through the 'Valve element is closed, but the inlet opening at least partially towards the bore. remains open if

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the valve element is in the working position. On the other hand or in addition, a channel can be formed in the valve body which directly connects the inlet opening and pressure chamber connects.

The invention is explained in more detail using exemplary embodiments in conjunction with the drawing, show it:

Fig. 1 is a plan view of a chainsaw according to an embodiment of the invention;

Pig. H is a side view of the chainsaw according to FIG Fig. 1;

, Fig. 3 is an enlarged sectional view of a Part of the chainsaw, seen in a plane 3-J5 of Fig. Ü

4 is an enlarged sectional view in a Level 4-4 of Figure 1;

Fig. 5 is a sectional view in a plane 5-5 of Fig. 4; ·

Fig. 6 is a sectional view in a plane 6-6 of Fig. 4;

Fig. 7 is an enlarged sectional view of 'd in a plane 7-7 of Fig.

8 is a cross-sectional view in one plane 8-8 of Figs.

9 shows a side view of a secateurs according to a second embodiment of the invention ";.

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Fig. 10 is an enlarged "sectional view of a Part of the pruning shears shown in Pig, 9;

Pig, 11 a sectional view in, .one plane .11-11 the pig. 10;

Pig .. I'd be a cross-sectional view in a plane 12-12 - the Pig «, 10;

Fig. 2 is a perspective view of a Part of a handle assembly deifin Fig. 9 shown Pruning shears;

FIG. 14 is a perspective view of a valve body of a _Ä valve assembly shown in Figs, 10 and 11 IH; : -

15 shows a partially sectioned side view of a modified embodiment of a valve attachment. Order;

16 shows a sectional view in a plane 16 * l6 of FIG. 15, and -.

Pig. 17 a perspective view of the ven valve body of the valve arrangement shown in FIGS. 15 and 16 *

The tool shown as a whole in Figs. * 1 and 2 has a handle part 12 and a tool «* part 14, the. Cutting tool contains * which is adjustably attached to an elongated housing 16 which is connected to the handle part lü. For supplying and discharging the ren serving to drive Druökmittels

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two lines l8, HO are provided. The tool part 14 comprises an elongated guide plate d.'d * which is detachable from one. Swivel head 24 is attached. A saw chain 3 ^> ÖS-S runs around the guide plate u'd and a toothed wheel 34. The toothed wheel 34 driving the saw chain is keyed to a shaft line 36 which protrudes from an end part 38 of the housing 16. The end part 38 has a perpendicular to it Axis protruding extension 40 on which the side swivel head 4 is rotatable by 360 about an axis going through the stub shaft 36. The swivel head is held on the extension 40 serving as a rotary bearing by thrust bearing disks, 4% and is with respect to the housing 16 can be swiveled, as shown in tri- dotted lines in Fig

The stub shaft 36, to which: the gear J> k is connected, is driven by a bevel gear mechanism. The bevel gear is connected via a shaft and a coupling 62 to one end of a drive shaft 64, which is connected by a tubular. Part 66 of the housing 16 is sufficient.

The drive shaft -64 and the tubular part 66 of the housing are interchangeable, so that you can use

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different lengths can be used according to the respective requirements. If an exceptionally long drive shaft 64 is required, it preferably consists of at least two tubular pieces 68, 70 * as shown in FIGS. 3, 4, 5 and 7. The tool-side end of the tubular piece 70 has an internal thread into which an extension 72 of the coupling Gd provided with an external thread can be screwed. A ball bearing 74 is fastened between the tool-side end of the tubular piece 70 and a shoulder 76, the coupling 62, through which one end of the drive shaft is attached. End portion 38 of the housing is rotatably mounted. The bearing 74 is held concentrically in the tool-side end of the tubular part 66 of the housing by an annular seat 78 with a channel-like cross section. In a corresponding manner, the other end of the drive shaft is supported in the tubular part 16 by means of a ball bearing 80 which is held in an annular seat. The bearing is supported between a shoulder 84 (Fig. 4) of a connector 86 and the drive end of the tubular piece (68) into which the connector 86 is screwed. The drive shaft is also supported in the middle by a ball bearing 88 (Fig. 7), which is held in an annular seat 90 which is made of an elastic material such as rubber, is ribbed on the outside and frictionally connected to the inner surface

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of the tubular part 66 is fastened via a metal sleeve 89. The bearing 88 is held by an externally threaded connecting bolt between the opposite ends of the tubular pieces 68, 70 of the shaft 6k .

When the drive shaft 64 is made in one piece, the inner race of the bearing 88 can be an interference fit be careful of a knurled piece of the shaft.

The drive end of the shaft 64 is connected via the connection part 86 to the output shaft 92 of a rotating hydraulic motor 94, as shown in FIGS. 4 and 5. The motor has a housing 96 connected to the handle part ^and an end plate 98 which has an axial extension 100 into which the motor-side end of the tubular part 66 of the housing 16 is clamped.

The handle part Vd also carries a valve assembly 10c !, which is enclosed by a housing 104 which extends from the side of the motor 94 facing away from the tool away from its housing. A curved handle 106 is connected to the housing 104 and extends from the motor 94 to a holder 108 for the lines 18, HO. The lines 18, 'dO pass through the holder 108, as shown in FIG. 8, and pass through it a clamping piece 110 and a bearing piece 112 clamped, which is connected to the front end of a spacer 114, the

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is connected to the housing 104 belonging to the handle part 12. The lines l8, 20 are in this way in with respect to inlet and outlet channels 116 or, Il8 in the handle part aligned with the hydraulic motor 94 in Are connected, as Fig. 6 shows.

The inflow and outflow of the pressure medium to and from the engine is controlled by the valve assembly 102. in the The handle part is a cylindrical opening for this purpose 120 is provided which, as Mg. Β shows, in the inlet and Exhaust passage 116 or 1Ϊ8. Cuts so that one to the engine parallel bypass flow path is formed ". The valve assembly includes a valve body 122- which is sealed in the opening 120 is mounted and with this a cavity 124 (Fig. 4) forms to which the lower end of a back and forth moveable valve element (126) adjoins. The valve element * is in a bore 128 of the valve body between a rest position and a working position displaceable. At rest, there is a bypass flow path released between the inlet channel 11β and the outlet channel 118, during this weave closure flow pathfi.n the working position of the valve element 126 is gepeat, so that the pressure medium! -, flows through the hydraulic motor 94 and drives this. ■

The valve element 126 can against the through the pressure medium in the cavity 124 exerted on it by a trigger-like actuator I30 from the rest

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position can be brought into the operating position. The actuating member I30 is pivotably mounted on the curved handle back 106 of the handle part and is coupled to the valve element 126 via a connecting member iyd. The actuating member 130 can be pivoted about a pin 1J54 (FIG. 6) and protrudes downwards over handle shells I36, so that it can be actuated because of it. The construction and the mode of operation of the valve arrangement 10'd are essentially the same in the case of the chain saw described and the pruning shears shown in FIGS . 9 to 14, so that they are not explained again in the case of the last-mentioned tool.

To put the tool into operation, the actuator Γ30 is pivoted clockwise in Fig. 2 , so that the valve element in the bore Iü8 is brought down into the operating position in which it blocks the bypass flow path between the inlet and outlet channels II6 or II8. The free circulation of the pressure medium through the bypass flow path is thereby interrupted and the pressure medium now flowing through the hydraulic motor drives it and the output shaft 92 begins to rotate. The rotation is transmitted to the tool part by the shaft 64 and the winding drive 46, 58. When the actuating member 130 is released, the valve element 126 is pressed upwards into its rest position by the pressure medium and the pressure medium can again be released through the bore I28 in the valve body.

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Let passage 116 flow to the outlet passage Il8 ', bypassing the motor. The engine therefore stops immediately without delay. _: ; -'- "■ -,"

Fig. 9 shows a pressure medium-actuated pruning shears. 138, which has the same valve arrangement as the chainsaw shown in FIGS. The pruning shears consists of a handle l4o, which is detachable through a Coupling ΐ4ί £ with an elongated intermediate piece 144 connected is,. followed by a scissor head 146> one fixed blade 148 and one pivotable blade 15Q. includesv The intermediate piece 144 contains a piston rod (not shown) which is connected to a piston motor housed in the handle.

Tile Fig. 10 to IJ show, the handle .14-0 has a roller-shaped outer housing I5H, which receives the hydraulic piston motor. The motor comprises an externally threaded chamber portion and a cylindrical handle body 156 which has an internally threaded end 158 into which the; the external thread provided piece of the chamber part 154 is screwed. In the handle body there is an inlet channel 160 / which is connected to the chamber in the piston engine via a connecting channel l &'d, and an outlet channel l64. An inlet line 166.-or. an outlet line 168 is connected. In the handle body I56 is also

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A cylindrical opening Ifα is formed, which is in communication with the inlet channel 160 and the outlet channel 164. In this way, a bypass flow path is formed between the inlet and outlet channels which can be controlled by a valve arrangement 174. A Operating lever Vj6, which is pivotably mounted on the handle body 156. For this purpose, the handle body has a slot 178 which is penetrated by a bore and receives a holding part 18 ^ of the operating lever, which is anchored by means of a pin 184 received by the bore 10 shows, a threaded bore 186 cuts into the slot 178 and receives a stop screw 188 which limits the counterclockwise rotation of the actuating lever corresponding to the rest position of a valve element 190 of the valve arrangement 174.

As mentioned, the valve arrangement 174 is similar in structure and mode of operation to the valve arrangement 102 of the chainsaw shown in FIGS. It thus contains a valve body lp / d which is arranged in the cylindrical opening YJ'd and with this forms a cavity 194, to which one end 196 of the valve element 190 adjoins. The pressure medium in the cavity 194 therefore exerts an axial pressure on the valve element 190, as a result of which it is pretensioned into the rest position. The cavity 194 is through a 0-

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Ring seal. 197.abgedichtj which is received in an annular groove 198 in the valve body. O-rings 20h, which are received by grooves 204 in the valve element spaced apart in the axial direction, are used to seal a bore 100 axially penetrating the valve body I92. The valve body also has an inlet opening dO6 which is formed by a recess and which establishes a connection between the bore JdOO and the inlet channel 16O. In addition, an outlet opening HO8 is formed in the valve body, which creates a connection between the bore HOO and the outlet channel 164. From FIGS. Id and 14 it can be seen that the axial length of the inlet opening 206 is greater than that of the outlet opening 208, so that when the valve element 19O is pressed down into the working position, only the outlet opening 208 is closed, and the connection between the bore 200 and the outlet channel l64 is interrupted. The cavity 194 is therefore always supplied with pressure medium via the inlet channel 160. A connection between the inlet opening, 'dO6 and the cavity 194 is established through a channel 210, so that pressure medium can flow freely into or out of the cavity 194; can flow away from it and the movement of the valve element is not hindered when it is near its lowest position. When the valve element I90 is brought into the working position by the actuating lever 196, which is indicated by a button at the upper end 214

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of the valve body attacking stop pin * ί is determined, the outlet opening 208 is closed and the pressure medium supplied to the inlet channel 160 puts the piston chamber under pressure. The piston, not shown, arranged in the chamber is thereby displaced into its working position and swivels the movable blade 150 against the fixed blade 148 Pressure too. Since the inlet channel and the cavity 194 communicate with one another, the pressure in the cavity also rises and, in the event of an overload, reaches a value such that the valve element 190 is pushed back into its rest position. As a result, the shunt is then opened through the bore 200 and the piston engine is relieved.

On the basis of the explanation of the FIGS. 10, 11, 12 and 14 illustrated valve assembly 174 can be without further understand that this arrangement for controlling the pressure medium supply to both piston engines according to the in the pig. 9 to 14 illustrated embodiment as also rotating, gear pump-like motors with liquid 1 to 8 can be used. The power tool shown in Fig. 9 can also by a pressure medium circulating in a closed circuit can be fed if the valve arrangement explained

009885 / 05E3 °> "'n * l" spectcd

replaced by the 'valve arrangement shown in the ^ Fig, 15 to I7. This valve assembly includes a handle body 216 which is located in a tubular housing 218 of the handle piece. Inlet and outlet channels 220 and arise in connection with a cylindrical opening 224 'which receives a valve body 226 ". The handle body 2I6 also has a connecting channel 228 between the cylindrical opening and a piston chamber 2/30 at an axial distance from the inlet channel HHO. The valve body 226 is provided with a bore 2ji4 which receives a thread bobbin-shaped valve element 232, so that the connection between an inlet port 2j56 and a cylinder pressure port 238, which are axially spaced and perpendicular to each other in the valve body, can be established or interrupted. The inlet port 2 ^ 6 is in communication with the inlet channel 220, while the pressure port '238 coincides with the connecting channel 228.' In addition, an outlet recess 240 is formed in the valve body, offset by 180 ° with respect to the inlet opening a.36 , which is connected to the outlet channel 222. In the rest position of the valve element 252, which is shown in FIG 238, the lower end of the bore 234, the chamber under the valve body 22,6, the recess 24o and the outlet channel 222 emptied

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Valve element d ~ $ 'd is in its working position, pressure medium is introduced from the inlet channel ' ddO through the bore 'dj> \ and the pressure opening Ü58 into the piston chamber ' d ^ O. The valve body ^r d'd6 also has an annular groove ■ dh'd for a sealing ring ü44. The valve arrangement described last can also be used for a rotating drive motor in connection with a closed pressure medium circuit.

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Claims (1)

Claims , ^ l . Hand tool with a 'pressure medium actuated drive motor and a control valve ,, which controls the flow of pressure medium between a pressure medium inlet and a pressure medium outlet on the one hand and the drive motor on the other hand, since durchgeke η η ζ ei ch η et that the control valve has a valve housing (96, 2I6) with an opening (IHO, 172) in which a valve body (122, HH6) is mounted which has a bore which receives a movable valve element (190, 222} and via an inlet or outlet opening (206 * 236; 2O0) in the valve body is connected to the pressure medium inlet (I60, 220) or pressure medium outlet (15 ^, 222), and that the valve element is switched between a rest position by a manually operated actuating device (I50, 176), and the drive motor via the Bore communicates with the outlet opening, and a working position in which the outlet opening is closed by the valve element is adjustable, 2, hand tool according to claim 1, dad u r c h ge-Jcenn. draw η e t that the valve body a third opening (228), which the bore with the ' drive motor connects, and that the valve element the shape 009885/0553 and a yarn package is in the working position, the Einlaiiöffnung and the third port connects un ^f in the rest position the third port and connects the outlet port. J5- »Hand tool according to claim 'ά, characterized in that the outlet opening is formed by one end of the bore, that a chamber is formed in the valve housing at this end of the bore, and that the outer surface of the valve body has a channel (Z ¹ K)) which connects the chamber and the outlet channel. 4. Hand tool according to claim 1, d ad ur ch geke η η ζ ie i'o h η et that there is a connection between the inlet and the outlet opening through the bore when the actuator is in the rest position (Pig- . Vd).,. that in the opening of the valve housing a pressure chamber (194) is formed which adjoins a surface (196) of the valve element, and that the valve body is shaped so that it forms a connection between the inlet opening and the pressure chamber when the Valve element is in the working position, and a bias pressure is exerted on the valve element in the direction of the rest position. 0 0 988 57 0SS3 5 · Hand tools according to claim. 4, d ad u r c h g e Jc e η η ζ e i η e t that the inlet and outlet openings are ordered in the axial direction of the bore in such a way that that the outlet opening is closed by the valve element is, but the inlet opening remains at least partially open to the bore when the valve element is in the Working position is (Pig. Lid), ' 6 * Hand tools according to claim 4 or 5, d a d u r c h g e k e η η ζ ei c h η e t that in the valve body a connecting channel (iilO) is formed, which the Inlet port connects directly to the pressure chamber. 7 * Hand tool according to one of the preceding claims, since by ge ken η ζ eich η et, -that the valve housing carries a curved handle (106) on which a guide arrangement (108, 110) is attached, which is at a distance from Valve housing is located, with this curse tet and holds two lines (18, 20) which are connected to the inlet and outlet channels. 8. Hand tool according to claim 1 or one of the Claims 4 to 7 with a rotating pressure medium motor, characterized in that g e k: en η ze ic h η et that with the motor (94) is a pipe that also serves as a carrier 0098 8 5/05 53 -do- shaped housing (ΐβ) is connected to a tool carries, - a projection projecting perpendicular to its axis (40) and a pivot arrangement (ü4, 40 to 48) carries which the tool 'is pivotably mounted, and that in the end part of the housing a power transmission arrangement with an angular gear (46, 58) is housed, the one in the housing (16) extending drive shaft (64) and the motor with the tool (14) couples. 9. Hand tool according to claim 8, characterized marked that between the ends of the Shaft a friction-reducing bearing (88) is arranged, which is held by an elastic holder in the housing (l6) 10. Hand tool according to claim 9, characterized in that the drive shaft (64) consists of at least two tubular pieces (68, 70), which are connected by a threaded connecting bolt (90a), and that the bearing (88) between the opposing Ends of the two tubular pieces (68, 70) is attached (Fig. 7). 009886/0553