US1990991A

US1990991A - Electric cutter for ceilings, walls, and the like

Info

Publication number: US1990991A
Application number: US722327A
Authority: US
Inventors: Heubach Ernest
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-04-25
Filing date: 1934-04-25
Publication date: 1935-02-12
Anticipated expiration: 1952-02-12

Description

Feb. 12, 1935. E, HEUBACH 1,990,991

ELECTRIC CUTTER FOR GEIL-INGS, WALLS, AND THE LIKE Filed April 25,- 1934 INVENTOR ERNEST HEUBACH -.5' tionJof a device as mentioned-which is: char Yet Patented Feb. 12, 19 35 v +1.;

"Ernest Heubach, New York, N. Y.

movements in an electric cutter-for cracks in ceilingsand walls of plaster, etc.

:{IIhe invention hasfor an object theconstrucaoterized byits ability to-absorb dust and small particles produced when cutting .out rthe. plaster of a wall. 1; v ,Still further, the invention proposes the arrangement of a tubular casing open at'the'front the shaft drawn through the frontof the casing and discharge through said conduit.

Furthermore, as another object of this invene tion it is proposed to arrange a battle within the front of the casing to coact with the action of the suction fan in moving air through the conduit.

Still further, it is proposed to provide a thrust bearing for the motor so as to take up the thrust due to operating the cutting tool.

- Another one of the objects of this invention is the arrangement of telescopic shaft sections composing the front portion of the shaft for said 1 tool, and a mechanism for telescopically moving said shaft sections to extend or retract the cutting tool relative to the front of the casing.

Furthermore, the mechanism is also proposed for latching the telescoping shafts in various extended positions. i

vThe invention also contemplates an arrangement whereby a grinding tool such as a sandpaper disc may be substituted for the cutting tool:

As another object of this invention it is proposed to construct a device as mentioned. which is simple and durable and which maybe 'manu factured and sold at a reasonable cost. I

. For further comprehensionof the .invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.v "In the accompanying drawing forming a material part of this disclosure:---

-'Fig. 1 is a longitudinal sectional view of a device constructed according to this invention;

Fig. 2'is a fragmentary view of the front por-.

tion of Fig. 1 but illustrating a different tool substitute. g g. 1

'of substantially hemispherical shape.

.1 Fig. is a fragmentary View of-a portion of Fig. 1 but illustratingva modification vention. v

' Fig. 4:18 a side elevational view of another type of cutting, tool for thedevice. v

The electric-cutter-for cracks in ceilings, walls;

of .the in eto., comprises .a tubular casing consisting of-a. 1 front casing section detachably connected with a rear casingsection 11, said casing being provided with'afront open end 12 andalso: being provided with a partition 13 for dividingit into a front compartment and a closed-rear compartm'ent. An electric motor14 is arranged with'-. in the closed rear, compartment of the casing and has its shaft 15 extending exactly through the center of the casing. Acutting tool 16 is detachably mounted upon the end of theshaft-15. i A hollow conduit 17 connects the front ofv the casing with the inletvl8 of a-dust bag collector 19. A suction fan 20 is arranged upon the shaft 15 for drawing through the front of the casing an discharging "through the conduit 17.

The cutting tool 16 is shown of conical shape and comprises aplurality of'radial blades,.and is formed with a threaded stud 21 at the rear end adapted to engage into a threaded aperture formed in the end of the shaft 15.' The cutting tool 16 in Fig. i is similarly constructed but is A spider construction 22 is mounted within the front end of the casing and has openingsfor the passage of air, and a hub portion 23 equipped with a bearing 24 for the shaft 16. A baffle plate 25 is arranged within the front portion of the casing and acts in conjunction with the suction fan 20 to direct thedischarge through the conduit 17. More particularly, the suction fan 20 is of the centrifugal The conduit 17 is in the form of a handle by which the device may be supported and manipulated. The rear of the conduit 17 terminates in a portion 28 which is attached upon the rear closed end'of the casing section 11. The portion 28 is .also provided with a flange 29 which con-' meets with the inlet 18 of the dust bag collector.

A-suitable arrangement is provided so that the inlet 18 may be separated from the flange 29.

' The casing section 11 has areduced shoulder 30 at the front end upon which the rear end of the casing sction'lO engages.

other means may be 'provided'for holding these casing sections together. Several bent openings 31 are formed in the casing section 11 to prevent overheating of the motor." A fan 32 is mounted upon the shaft'lfi of the motor so as toproduce.

Frictional means or bearingis arranged toresist the pressureofxthe.

shaft 15 and comprises a bracket 36 attached upon the disc 35 for supporting an expansion;

spring 3'? carrying a bearing ball 38 at its end engaging against the end of the shaft '33. [1

The operation of the device consists in holding the handle, the conduit 1'7, and moving the device along so that the cutter 16 cuts the material of the plaster in the sides of the crack. The open" end 12 of the casing preferably should be in intimate contact with the wall or ceiling so that a large amount-of dust is-draw'n in by the suction fan. This dust is discharged and collected in the dust bag 19.

InFig. 2 another arrangement :of the device has been illustrated in which a sandpaper block 40 is shown substituted for the .tool .16. This sandpaper block is also shown provided with a threaded stud -21 which .threadedly .engages in :the endof theis'haft .15. The device may thus be used for finishing the plaster surface -.or other similar purposes. a

In Fig. 3 a modified arrangement has beendisclosed in which provision is made for slightly extending and slightly retracting the cutting tool. With this arrangement .it is possible that first a small out be taken in the crack of the plaster and then a larger cut and in this manner the front open end of the casing may always be inintimate contact with the :surface of the wall.

More particularly, the :means mentioned in the previous paragraph comprises

telescopic shaft sections

15 and 15 substituted for the shaft 15. The shaft section 15 is integral with the rotor of the motor and has a square portion extending into a corresponding opening in the section 15' to transmit rotations. A flange 41 is fixed :upon the shaft section 15 and an expansion spring 42 acts between the partition or spider Y22 and the flange 41 for normally urging the shaft section 15 into a retracted position. A pin 43 extends from the side of the :shaft section 15 and works in an elongated slot formed in the end of a lever 44 which is pivotally supported at 45 upon the casing of the device and which extends through an opening to the exterior. A link 46 connects with the extended end of the lever 44 and connects with a trigger 47. This trigger is pivotally mounted .intermediately at 48 upon the conduit 17. The front end of the trigger extends into the vicinity where the index finger would be so that it may be readily manipulated.

A rack 49 is pivotally supported at the point 50 upon the spider 22 and is engageable with a tooth 51 projecting from the shaft section 15. This rack, in a horizontal position engages the tooth 51 and also abuts against a stop 52 projecting from the casing of the device. A link 53 is equipped with a;pin working in a slot in the end of the rack 49 and the link 53 extends to :the exterior of the casing. A ring 54 is attached upon the extended endof the link 53. A coaxial spring 55 acts between the casing of the rack 49 to normally urge it into the horizontal position. The link 53 is composed of two sections including an outer section formed with an elongated slot 56 in which a pin 57 from the inner section engages. The arrangement is such that the link 53 may be extended to a point at which the outer section may be pivoted at right angles and moved to a position so as to be locked outside of the casing.

Then the rack 49 is held in an inoperativeposi'tiori. In operation the rack 49 may be moved to its inoperative position so that the extension and retraction-of the cutting tool can zbe icontrolled instantly. ;by;:moving thestriggerg i'l. If desired, the cutting tool may belatchedin any of its ex- .tended positions by allowing the rack 49 to move to thehorizontal position. In other respects the jdevice'functions as previously described relative "to the-preferred form.

- Having thus .described my invention, what I claim as new, and desire to secure by United States Letters Patent 151-- 1..An-electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft co-axially extending through the front erid ofthe casing; a cutting tool on the front end of the shaft for cutting \the plaster of i-thecrack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, ::and .a suction fan on said shaft for drawing air throughthe front of the casing and discharging through said conduit; 4 Y

2..Anlelectric cutter forcracks in-ceilings and walls of plaster, etc., comprising-a tubular casing open at the frontend and having a partition dividing it,.into front and'rear compartments, an electric motor in' the closed rear compartment and having its shaft coaxially extending through the front endof the casing, acutting tool on the front endof the shaft for cutting the plaster of the :crack, .a hollow conduit connecting the front compartment with the inlet of a dust bag collector, and a suction fan on said shaft fordrawing air through the front of the casing and discharging through said conduit, a baffle plate with a central opening being arranged to the front of the suction bag.

3. An electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft-coaxially extending through the front end of the casing, a cutting tool on the front end of the shaft for cutting the plaster of the'crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, and .a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit, a baffle plate with a central opening being arranged to the front of the suction bag, and said fan being of the centrifugal type discharging through the ends of the conduit arranged on the peripheryof the casing inthe vicinity of the fan.

4. An electric cutter for cracks inceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and-having its shaft coaxially extending through the front end of the casing, a cutting toolon the frontend of the shaftfor cutting the plaster of the crack; a hollow conduit connecting the front compartment with the inlet of a dust bag collector, and a suction fan on'said shaft for-drawing air through the front of the :casing' and discharging through said conduit, said rear compartment being formed with several vents.

:5. An .electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft coaxially extending through the front end of the casing, a cutting tool on the front end of the shaft for cutting the plaster of the crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, and a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit, said rear compartment being formed with several vents, and a fan being arranged upon the motor rotor in said rear compartment.

6. An electric cutter for cracks in ceilings and Walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electricmotor in the closed rear compartment and having its shaft coaxially extending through the front end of the casing, a cutting tool on the front end of the shaft for cutting the plaster of the crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, and a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit, said electric fan being equipped with a thrust bearing at the rear end.

7. An electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft coaxially extending through the front end of the casing, a cutting tool on the front end of the shaft for cutting the plaster of 'the crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit, the rotor of said elec tric fan having a bearing, said bearing including 'a resilient thrust mechanism.

8. An electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft coaxially extending through the front end of the casing, a grind-ing disc on the front end of the shaft for cutting the plaster of the crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, and a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit.

9. An electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft coaxially extending through the front end of the casing, a cutting tool on the front end of the shaft for cutting the plaster of the crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit, and. the tool carrying portion of said shaft comprising telescopic sections arranged for unitary rotation and one section being movable relative to the other means for fixing said shaft sections in various positions, and means for controlling extension and contraction of said shaft sections.

10. An electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft coaxially extending through the front end of the casing, a cutting tool on the front end of the shaft for cutting the plaster of the crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit, and the tool carrying portion of said shaft comprising telescopic sections arranged for unitary rotation and one section being movable relative to the other means for fixing said shaft sections in various positions, and means for controlling extension and contraction of said shaft sections, said means for fixing the shaft sections including a rack engageable with a tooth projecting from the relatively movable of said sections.

11. An electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft coaxially extending through the front end of the casing, a cutting tool on the front end of the shaft for cutting the plaster of the crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit, and the tool carrying portion of said shaft comprising telescopic sections arranged for unitary rotation and one sec tion being movable relative to the other means for fixing said shaft sections in various positions, and means for controlling extension and contraction of said shaft sections, including a trigger in the vicinity of said hollow conduit which latter element comprises a handle.

12. An electric cutter for cracks in ceilings and walls of plaster, etc., comprising a tubular casing open at the front end and having a partition dividing it into front and rear compartments, an electric motor in the closed rear compartment and having its shaft coaxially extending through the front end of the casing, a cutting tool on the front end of the shaft for cutting the plaster of the crack, a hollow conduit connecting the front compartment with the inlet of a dust bag collector, a suction fan on said shaft for drawing air through the front of the casing and discharging through said conduit, and the tool carrying portion of said shaft comprising telescopic sections arranged for unitary rotation and one section being movable relative to the other means for fixing said shaft sections in various positions, and means for controlling extension and contraction of said shaft sections, including a trigger in the vicinity of said hollow conduit which latter element comprises a handle, and resilient means for urging the movable of the telescopic shaft sections in one direction.

ERNEST HEUBACH.