US2227627A - Rotary tool - Google Patents

Description

Jan. 7, 1941.v

D. BRUZON ROTARY ToL Filed Nov. 3, 1938.

i annif wim/Q7 Patented Jan. 7, 1941 UNITED STATES ROTARY TOOL David Bruzon, Chicago, lll., assignor to Perfection Auto Parts Mfg. Co., tion of Illinois Chicago, Ill., a corpora- Application November 3, 1938, Serial No. 238,547

3 Claims.

This invention relates to improvements in screw driver bits and wrench sockets and more particularly to such as are used with power driven means.

An object of this invention is the provision of a screw driver bit and wrench socket in which the torque of the operating means is applied to a screw or nut to drive same and is released when the operation is completed.

Another object of this invention is the provision of a screw driver -bit and wrench socket which completely eliminates the possibility of shearing off of the head from the body of the screw. A

A further object of this inventionvis the provision of a 4screw driver 'bit and 'wrench socket which is adapted for securement to any power driven spindle.

A still further object of this invention is the 2'0 provision of a screw driver bit and wrench socket which operates with equal eiciency in either direction of rotation to drive or to remove nuts, bolts and screws.

A still further object of this invention is the 25 provision of a screw driver bit and wrench socket which is extremely simple and durable in construction, which has very few parts and which can `be manufactured at low cost.

With the foregoing and other objects in view, 30 the invention consists of the novel construction,

combination and arrangement of parts, as hereinafter more specifically described and illustrated in the accompanying drawing, wherein is shown a device in accordance with this invention, but 35 it is to be understood that changes, variations and modifications can bev resorted to which fall within the scope of the appended claims.

In the drawing wherein like reference characters denote corresponding parts through the sev- 40 eral views:

Fig. 1 is an elevational viewof the screw driver bit. v. f

Fig. 2 is a vertical sectional view taken on line 2-2 of Fig. 1.

Fig. 3 is an enlarged plan view of a clutch member.

Fig. 4 is an enlarged4 elevational view of the clutch lmembers in operative engagement.

In' the drawing wherein is shown a preferred 5o embodiment of my invention the numeral I0 designatesthe screw driver assembly which is adapted to be secured to a driving spindle by means of a chuck I2. The screw driver assembly I8 comprises a housing formed of two cylindrical mem- 55 bers, an upper member I4 having an externally threaded portion I5 and a lower member I6 hav- I ing an internally threaded portion I8 and apertured as at to receive the driven spindle I1,.l presently to be described. The member I4 is provided with a spindle extension 2| integrally 5' formed therewith which is adapted to be secured in the jaws of the chuck I2. A hole 22 is provided in theupper member I4 for lubricating purposes.

Rigidly secured as by a pin 24 in the upper 10 housing member I4 is a clutch member 25 having an exposed corrugated surface 26 withI alternate ribs and recesses, substantially ,triangular in cross section, radiating from the center. Rotatlably and slidably mounted in the housing mem- 15 ber I4 is a longitudinally bored driven spindle I'I which is provided, at one end, with a slot 28 and at the other end with an enlarged portion 38 having a complementary corrugated surface 82 adapted for engagement with the clutch mem- 20 ber 25. A coil spring 34 positioned in the housing member I6 and encircling the spindle I1 bears against bushings 36 and 38 and serves to retain the clutch member and 38 in resilient engagement.

It is seen that by advancing or receding the housing members I4 and I6 with respect to each other the compression of thespring 34 can be adjusted to increase or decrease the torque to a predetermined point. A set screw 38 serves to retain the housing members I4 and I6 in` adjusted relative position.

A screw driver bit 40 is reciprocally mounted in the bore 49 of the driven spindle Il'and isop- 'eratively connected thereto by a pin 42 which extends through the bit 40 and which 'operates 'in 'the slot 28 of the driven spindle I'I to cause the bit 40 and spindle II to rotate simultaneously. -A spring 44 mounted in the core 49 of the driven spindle I 1, at one end,bears against the enlarged portion of the spindle I1 and at the other end, against a shoulder 4I formed on the screw driver bit 48 and serves to yieldingly hold the bit 40 in outermost position. y Y o An inverted cup shaped mem-ber '46 mounted on the bit 4I) encloses the lowerend of same and serves asa guide or finder for the'screw. The bit 40 isv provided with a circumferential groove 41 in which is seated a spring ring 48 which acts as -a shoulderto secure the member 46 on the bit 4U. A helical spring` 5U encircling the bit 48 yieldingly maintains the member 46 at the extreme portion ofthe bit. While ascrew driver bit is illustrated, it will be understood that a 55 drive nuts andbolts.

In operation, the clutch faces 26 and 32 are always in engaged relation' and the tool rotates continuously as a unit. When the tool is brought in contact with the work the spring 50 permits the guide member 46 to yield while alignment between the bit 40 and the slot of the screw is being eilected. When the point of the bit 40 registers in the screw slot, slight pressure compresses the spring 50 and causes the bit to recede within the longitudinal bore 49 of the driven spindle I1. It will be seen that the yielding arrangement'of the guide 46 and the bit 40 is such that the deiacing or marring of the work' is completely avoided.

Assuming that a specified torque is required for a particular job and that an adjustment for same has been made on the spring 34, it will be seen that during the driving operation the driven spindle i1 rotates with the driving spindle 2|. However, when the torsional resistance of the screw exceeds the applied torque the spring 34 will yield and permit 'the clutch surfaces 2B and 32 to slip on each other, the incidental noise of said slipping warning the operator that the operation has been completed and that the tool should be withdrawn. The slipping of the clutch members 26 and 32 has the eiect of applying tangential blows to the screw which further serves to tighten same to a greater degree.

When it is desired to use the device for removing screws, nuts and bolts the rotation of the driving spindle is reversed so that the torque is applied in a counter clockwise direction. Ii the screw or nut yields to the applied torque there is no slipping of the clutch membersv upon each other. However, if it does not yield and offers resistance to the rotation of the tool the clutch members will slip upon each other and in effect lapply tangential blows to the screw or nut the application of such blows tending to eiect a release of the screw or nut. It will thus be seen that I have provided a tool which is adapted for driving orzremoving screws, nuts and vbolts .and which is automatically arrested in its "operation when the torsional resistance exceeds the applied torque, the tendency to injure the jtool or to deface the Work thereby being completely eliminated.

p It is to be understood that the form of my invention, herewith shown and described, is to be taken as a preferred example of the same, andV that various changes in the shape, size and ar-,y

rangement of parts may be resorted to, without departing from the spirit of my invention, or the scope of the appended claims. u

I claim:

l. A device of the character described compris# ins a4 housing having avgshajnk at vone end thereof.' adapted for connection'with a driving spindle, a

toothed clutch member rigidly .secured within the housing at the end adjacent the shank member,L the/other end of said housing comprising a wall.v

n 2,227,627 4socket wrench may be substituted therefor to independently rotatable and axially movable relative to the other clutch member, a spring within the housing for normally maintaining said clutch members in operative engagement, a longitudinally bored spindle mounted on said complementary clutch member and projecting through the Wall opening of the housing, a tool shank mounted in said spindle for rotation therewith but being axially movable relative thereto, and a spring within the bore of the spindle abutting against the tool shank for normally urging the tool shank outwardly o f the housing.

2. A device of the character describedtcomprising a housing, a shank member associated 4with said housing and adapted for connection with a driving spindle, a toothed clutch member thereto, resilient means mounted within thel longitudinal bore for yieldingly holding said tool shank outwardly of said spindlegjgA and spring means for normally maintaininfisaid clutch l members in operative engagement, said clutch members arranged to be relatively movable when the torsional resistance on the depending spindle exceeds the applied torque of the driving spindle,

the relative movement of said clutch members serving to apply tangential. blows to said depend- 'c ing spindle.

3. A device ofthe character described comprisl ing a housingformed of upper andlower sections,

a shankv mounted on the upper section adapted for connection with a driving spindle, a toothed clutch member rigidly secured within the hous`A ing at the end adjacent the shank member, the

lower section of said housing having a wall at its lower end with an opening therethrough, a complementary toothed clutch member mounted within the housing,` said complementary clutch member being independently rotatable' and axially movable relative to the other clutch member, a

y spring within the housing abutting against the lcomplementary clutch member and the lower wall of the lower section for normally maintaining said clutch members in. operative engagement, said sections being movable-relative to each other to vary thegtension on said spring, a 1ongitudi4 'nally boredfspindle mounted on said complementary clutch member and projectingA through the wall opening of the lower section, a tool shank A-mounted in said spindle for rotation therewith but being axiallymovable relative thereto, and ajj .spring withinlthe bore of thel spindle abutting against the tdo'ljfshank for` normally urging the.

"tool Vshank outwardly of the housing.

DAviD BRUzoN. v

Images