US2442505A

US2442505A - Constant speed burning attachment for hand torches

Info

Publication number: US2442505A
Application number: US555957A
Authority: US
Inventors: Harvey U Millett
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-09-27
Filing date: 1944-09-27
Publication date: 1948-06-01
Anticipated expiration: 1965-06-01

Description

June I, 1948.

H. u. MILLETT CONSTANT SPEED BURNING ATTACHMENT FOR HAND TORCHES 2 Sheets-Sheet 1 Filed Sept. 27, 1944 INVENTOR.

TT'ORNEY.

June 1, 1948.

H. U. MILLETT CONSTANT SPEED BURNING ATTACHMENT FOR HAND 'I'ORCHES Filed Sept. 27, 1944 2 Sheets-Sheet 2 ll i'ii'."

HAQVEY Tole/v5 y.

Patented June 1, 1948? CONSTANT SPEED BURNING ATTACHMENT FOR HAND TORCHES Harvey U. Millett, Hawthorne, Calif. Application September 27, 1944, Serial No. 555,957 4 Claims. (01. 266-23) This invention relates tov a constant speed burning attachment for hand torches.

In its broader aspect the invention relates to a carrier for mechanically supporting a metal fusing torch in a position to cut the metal of an object over which the carrier is movable.

Heretofore one of the defects of metal fusing torches has been the failure to maintain a constant speed of movement of the torch across the work being operated upon, so as to make the desired clean out through the metal.

Among the principal objects of the invention is to overcome the aforesaid defect.

Among other objects of the invention are: to proVide a carrier for a torch which is governor controlled to maintain the constant speed desired for the burning attachment, as may be required for operating upon difierent kinds of work; to provide magnetic means to cooperate with one or more of the traction wheels with which the device is supported, so as to make a more positive action of said governor; to provide improved mounting means for the torch; to provide improved means for attaching the device to difierently shaped metallic objects being operated upon, and to, in general, provide a compact and efficient carrier to control the operation of metal cutting torches whether used on horizontal underlying objects or in overhead or still other positions.

By this invention it is made possible to use metal torches cutting in an eflicient manner in situations where their use has hitherto been impossible.

By the use of this invention it is possible to produce smooth, clean burns on either fiat plates or on pipes, and even when the surfaces to be operated upon are at various inclinations.

Other objects, advantages and features of invention will hereinafter appear.

Referring to the accompanying drawings, which illustrate What are at present deemed to be preferred embodiments of the invention,

Fig. 1 is a perspective view of the device.

Fig. 2 is an enlarged vertical section taken on line 2-2 of Fig. 1, part of the torch support being broken away to contract the View.

Fig. 3 is a vertical section taken on line 3-3 of Fig. 2.

Fig. 4 is an enlarged vertical section on line 4-4 of Fig. 2.

Fig. 5 is an enlarged sectional detail taken through the governor at a right angle to the showing of Fig. 4.

Fig. 6 is a section taken on angular line 6-6 'of Fig. 2, parts being broken away to contract the view and also to show underlying structures more clearly.

Fig. 7 is an end elevation showing a portion of a modified form of the device attached to a circular object being operated on by the torch.

Fig. 8 is a fragmentary side elevation looking in the direction of the pointing arrow 8 in Fig. 7.

Referring in detail to the drawings, the device as shown in Figs. 1 to 5 comprises a carrier casing, or frame II for supporting an acetylene torch frame l2 adjacent a piece of work I 3 to be operated on by said torch. Wheels I 4 and I5 support said frame, said wheels traveling upon the work I3 at a predetermined speed while the burner tip I 6 burns its out through the work. Said wheel I5 is a traction wheel and has its outer surface knurled to contact more eificiently with the smooth surface of the metal being operated upon. Said wheel I5 is mounted upon a shaft I! having a loose bearing fit in a side Wall 19 of the frame I I, there being fixed to said shaft a gear 2i], said gear meshing with a pinion 2| which forms the hub portion of a gear 22 on shaft 23 carried by said frame and serving as a bearing for the wheel 22 and pinion 2| fixed thereto. Gear 22 meshes with a pinion 22a fixed to a gear 24, said pinion and gear bein rotatably mounted upon a shaft 25, a cylindrical spacing sleeve 27 being provided to' complete this part of the structure. Gear 24 meshes with a pinion gear 28 fixed to a gear 29, said pinion and gear being mounted upon the aforesaid shaft 23 and being positioned to maintain the mesh of pinion gear 28 and gear 24 by means of a spacer sleeve 30. Gear 29 meshes with a gear 3| mounted upon a shaft 32, one end of which is carried by the casing wall l9, and the opposite end of which is carried by a bearing member shown as a frusto-conically recessed nut 33 adjustably screwed into the casing wall 3t. Said shaft 32 has fixed to it a centrifugally operable governor 35.

As viewed in Figs. 4 and 5 said governor comprises a centrifugally operated shoe or brake member 36 which is radially mounted upon the shaft 32 by means of a pintle 31 which is provided with a retractile coil spring 38 to maintain the shoe 36 out of contact with the frusto-conical surface 40 of the nut 33, except when the pre-- determined speed to which the device is set is egceeded. The shoe 36 has a tread 36a tapered in correspondence with the taper of the surface of the frusto-conical recess 40.

On the upper portion of the frame I l is adjustably mounted by means of a screw-bolt 500. an arm 50 for supporting the vertical limb 5| of the L-shaped torch carrying member 52, said arm 50 being provided with a clamp structure 53 whereby the limb is gripped for both rotational and longitudinal adjustment. Upon the limb 54 of the structure 52 is mounted a bracket 55 which supports the burner tip l6, said bracket being rotationally and longitudinally adjustable on said limb 54, clamping means 56 being provided to maintain the burner tip H3 in its various adjusted positions.

In order to cause the wheel l5 to bear more heavily upon the work, thereby to cause increased traction upon the wheel so as to operate the governor -35 more positively a magnet 51 is mounted between the wheels upon the casing H and adjacent to the work by means of a screw 58 tapped into a threaded hole in the .casing.

In Fig. 7 is shown an adaptation of the device for making a burning cut upon a circular object as, for example, the pipe 59 shown. Mechanism is shown for obtaining traction between the wheel 15 and said pipe. The mechanism as therein shown consists of an encircling band 69 provided with a plurality of rectangular apertures 60a occupied by traction wheels 6! mounted upon axles '62 journalled between clips 63 fastened to the band at transversely opposite sides of said apertures, as shown. By preference, and as :shown,-said clips consist of angular plates each of which has a flat body portion 63a through which extends a screw 63b for attaching each plate internally to the band in a slightly spaced relation to the other in order to hold the axles =62 in place between deflected nose portions 630 of said clips.

The tension means for obtaining a firm contact between the wheels and pipe consists of a clamp screw 64 screwed into an angle piece 85 secured to the exposed end 60a of said strap and having an abutting relation to a filler member 66 having through it an aperture 66a, said filler being interposed between the outer face of the adjacent end portion of the band 60a and the casing ii, there being

elongated slots

61 and 68 adjacent to each end of said encircling band, through which extends a bolt 69 that passes through said aperture 96a and is screwed into the threaded portion of the casing structure formerly occupied by the already mentioned screw for attaching the mag- .net to the casing.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the .subject .matter claimed.

What is claimed is:

1. A centrifugal speed governing device mounted upon a wheel supported frame, said frame providing a carrier for an acetylene torch whereby the latteris supported for movement adjacent to the work, means including a shaft operatively connected to the wheel support of said frame to rotate said device, means operatively connected with said device to apply a braking action to the rotation of a wheel of said wheel supported frame when the speed of such wheel exceeds a predetermined amount, the latter means comprising a frusto-conically recessed nut adjustably screwed into said frame and carrying one end of said shaft, said governing device comprising a centrifugally operated shoe, a pintle whereby said shoe is radially mounted upon said shaft, said pintle being provided with a retractile spring whereby said shoe is maintained out of contact with the frusto-conical surface voi.:isaid nut except 4 when the predetermined speed to which the device is set is exceeded.

2. In a centrifugal speed governing device mounted upon a wheel supported frame, a rotatable shaft operatively connected with a wheel of said frame, a nut having an inwardly tapering frusto-conical recess in one of its ends, said nut being adjustably screwed into said frame and carrying one end of said shaft in a concentric relation to said recess, a centrifugally operable shoe, a pintle carrying said shoe, said pintle being slidably related to said shaft and extendin transversely through it, and a retractile spring operatively related to said pintle and coiled therearound to maintain said shoe out of contact with the frusto-conical recess of said nut except when the predetermined speed to which the device is set is exceeded.

3. In a centrifugal speed governing device to govern the speed of rotation of a carrier supporting wheel, a frame having two spaced apart side walls, a shaft one end portion of which is rotatably supported by one of said walls, an externally screwthreaded nut screwed into an aperture provided for it in the other of said walls, said nut having within it an axial bore within which the opposite end portion of said shaft is rotatably supported, said nut also having in the end thereof into which said shaft extends a concentric inwardly tapering frusto-conical recess, the part of said shaft within said recess having through it a transverse bore, a pintle eX- tending loosely through said bore and having a projecting end portion at each side of said shaft, a shoe carried by one of said projecting end portions of said pintle, a spring connected with the opposite end portion of said pintle and tending to move said shoe toward said shaft, and means carried by said shaft to form the last link in its operative connection with the aforesaidsupporting wheel of said carrier, so that when said wheel is rotated above a predetermined speed centrifugal force will cause said shoe to overcome the opposition of said spring and move into a braking relation to the surface of said conical recess, said shaft being anchored against endwise movement so that inscrewing of said nut will cause the governor to apply the brake at less speed and outscrewing of said nut will cause the governor to rotate faster before it applies the brake.

4. The subject matter of claim 1, and said shoe having a tread tapered with a taper correspond ing to the taper of the frusto-conical recess of saidnut.

- HARVEY U. MILLE'I'I.

REFERENCES CITED The following references are of record in the file-of this patent:

UNITED STATES PATENTS Number Name Date 1,276,367 Ide Aug. 20, 1918 1,379,360 Pickering May 24, 1921 1,431,377 Dean Oct. 10, 1922 1,852,413 Hickey Apr. 5, 1932 1,925,383 Hickey Sept. 5, 1933 2,030,840 Allen Feb. 18, 1936 2,208,211 Crowe July 16, 1940 2,278,607 Anderson Apr. 7, 1942 FOREIGN PATENTS Number Country Date 145,067 Austria Mar. 25, 1936