US1551179A - Power electric shears or scissors - Google Patents

Description

zwi. 192s.

J. L. STUMP ET AL POWER ELECTRIC SHEARS 0R SCISSORS F1106 March, 24. 1924 Patented Aug.. 25, 1925.

UNITED STATES i iss-ine PATENT OFFICE; f

JOHN LOUIS STUD/IIE' .AND CHARLES W. STUMP, JR., 0F CUMBERLAND, MARYLAND.

POWER ELECTRIC OR SCISSORS.

Application filed March 24, 1924. Serial No. 701,523.

10 in to the accompanying drawings.

This invention relates to a power electric shears or scissors, andthe. object of the invention is the construction of a simpleand eflicient shears that comprises a minimum number of parts, and which is very efficient in operation.

With this and other' objects in view, our invention comprises certain novel combinan tions, constructions and. arrangements of parts as `will be'hereinafter described, illustrated in the accompanying drawings, and more particularly pointed outv in the appended claims.

In. the drawings:

Figure 1 is a top plan view of a mechanism showing the top or cover of the housing or casing removed.

Figure 2 is av sectional View, taken on line 2--2, Fig. 1, and looking in the direction 30 of the arrows, the cover beingshown on the casing.

Figure 3 is a perspective view of the sliding block and the inner end of the driven shaft.

Referring to the drawings by numerals, 1 comprises the housing or casing and 2 is the top or cover thereof. In the forward end of the casing 1 is placed block 3, and in the casing, near the rear end, is block 4; the block 4 extends transversely of the casing and supports parts of the driving shaft 5 and the driven shaft 6.

The driven shaft 6' comprises an inner and 'an outer section which are connected by the universal joint 7, producing practi* cally a flexible shaft for driving the shear blades 8 and 9.

The lower blade 8 is fiXedly fastened (by screws, Fig. 2) to the top of the forward block 3, and the upper or pivotally mounted blade 9 is secured upon the fixed blade 8,

at 10, so that the upper blade 9 can swing or pivot to accomplish the cutting action.

We employ a sliding block 11 (Figs. 2 @5 and 3), which is placed .upon the forward block 3, 'and the forwardly-extending extension 12, of bloclr11, extends into a groove 13 in block 3. in the bottom of block 11 1s formed a groove 14, into which extends the long rib 15, which serves to hold the block 11 in an assembled position upon block 3. The block 11 is provided on `its outer or rear face with a plurality of stud pins 16, on which stud pins are mounted tapering or ,conical-shaped rollers 17. Formed in the outer face of bloclrll, just around the stud pinsl6, is a horizontal groove 18, into which extends the inner end 19 of the inner section of the driven shaft 6. On thisend 19 is placed aV roller 20, which roller is in the groove 18, (Figs. 2 and 3). Formed on the inner section of shaft 6, against block 11 is a. pinion 21 which in this instance is preferably provided with three `teeth that engage land travel over the rollers 17 on the stud pins 16. Y By reason of the pinion 21 traveling over the rollers 17, the inner sect-ion of shaft 6 will have to raise and fall, causing the reciprocal `movement of the sliding block 11. A screw 2 2 extends through slot 23 in blade'9,and positioned on screw 22 is roller 24. Bychanging the position of screw 22 upon bloc/lr 11 the stroke of the blade 9 will be controlled; ywhen the screw 22 is in the position shownwin Fig. 2, it will have a longer swing, or opening` capacity than if the screw were placed in threaded socket 22a nearer to the outer or rear face of the block; the changing of the position of screw v22 will be permitted owing to the length of the slot 23 (Fig. 2).

W e provide'af pair of angle brackets 25 for guiding the bearing block 26 in its vertical movement; the block 26 .is mounted upon the `inner section of shaft 6, and the block is provided with the forced plug 27 which -is for the `purpose of forcing a lubricant, in

the block, against the shaft 6. Each bracket 25 comprises a horizontal base 28, through 100 which extends screws 29 for fastening the brackets to the bottom of the casing 1. Integral with each base 28 is a curved upright portion 3() that is provided with a groove or guideway 31 upon its inner face, into 105 which extends the vertical sliding bearing block 26. The upper end of each eXtension 30 terminates in a flange 32 (Fig. 2) into which extends the fastening screw 33. It will, therefore, be Yseen that by means, 0f no screws 29 and 33 the angle brackets 25 will be securely fastened to the casing, with the bearing Yblock 26 working therebetween.

The driving shaft 5 is provided on its extreme inner end with the Vlocking collar 34, and intermediate its ends with a gear 35. Gear 35 meshes with the large gear 36, which gear 36 is idle upon the outer section of the driven shaft (i. A friction clutch 37 is suitably keyed upon shaft 6, preferably by reason of the shaft being flattened where it is engaged by clutch 37. The. clutch 37 is pressed inwardly by coil spring 38, which spring 38 is held in place by a set collar 39. Operating lever AO is pivotally mounted, at 4l, and is provided with an integral collar 42 that surrounds a portion of the clutch 3T, whereby, when the operator operates the outwardly-extending portion f3 of the lever, the clutchA 37 can be moved away from the gear 36 to stop the` mechanism from operating while power is being supplied to the driving shaft 5 for rotating the same. Then nzo manual pressure is being exerted upon `lever Ll() then spring 38 causes the clutch 37 to normally engage, in frictional contact, the gea-r 36 suficient to impart rotary movement to the driven shaft while the driving shaft .is rotating, and `hence in this manner the shear blade 9 is operated.

A felt washer All (Fig. 2) is placed between block 3, block 1l, the rear end of blade 8 and blade 9 to prevent any grease or lubricant moving forward to the cutting edges of the blades 8 and 9. y

While we have described the preferred embodiment of our invention, and havel illustrated the same in the accompanying drawings,.certain minor changes or valterations may appear to one skilled in the art to which this invention relates, during the extensive manufacture of the same and we, therefore, reserve the right to make such altera-tions or changes as shall fairly fall within the scope ofthe appended claims.

l/Vhat we claim is:

1. A power clipperVV comprising'V a casing, a stationary block in the forward end portion of said casing havingl its rear end portion shaped to provide a seat undercut at itsV forward edge, an upstanding rib extending transversely across the seat and intermediate its forward and rear edges, a stationary blade secuied to said. block and Y extending through a slot in the forward end of the casing above the block, a movable block resting in said seat and having a, lip extending into the undercut forward 'portion of the seat, a groove being provided in the lower face of the movable block and containing said rib to guide the sliding movement of he movable block transversely of the stationary block, a movable blade pivoted upon the stationary blade and having its rear end portion extending 'over the movable block and having aL longitudinally extending slot, a pin carried Aby said movableblock and extending through said slot fori imparting swinging movement to the movable blade when they movable block is moved in itsl seat, and means for impart'- ing sliding movement to the' movable block transversely of the stationary block.

2. A power clipper comprising a casing, a stationary block inthe forward endv portion of said'casing, a stationary blade carried by said. block, a movable blade pivotally mounted upon said stationary blade, a movable block slidably carried by said stationary block for movement transversely thereof and having an operative connection with said 'movable blade, said movable block having a pocket in its rear face and pinsl in the pocket in space-d relation to each other longitudinally of thel pocket and extending out of the pocket, a drivingv Shaft extending into the casing through theV rear end thereof, a driven shaft in said easing having its forward end extending into the pocket, a gear carried by said driven shaft andl engaging the outwardly protruding portions of the pinsfor imparting sliding'movement JOHN Louis srUMr. CHARLES w. sTUMnJR.

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