US2400196A

US2400196A - Pipe scraper

Info

Publication number: US2400196A
Application number: US539919A
Authority: US
Inventors: Grocoff William
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-06-12
Filing date: 1944-06-12
Publication date: 1946-05-14
Anticipated expiration: 1963-05-14

Description

May 14, 1946. W, .GROCOFF 2,400,196.

`PIPE scRAPER' Filed June 12, 19214 Patented May 14, 1946 ff.

UNITED i i STATES PATENT DFFICE PIPE soRAPER William Grocofl", San Francisco, Calif. Application Junelz, 1944, serial No. 530,919

` (ci. isi-246) i claims.

The present invention relatesto improvements in pipe Scrapers and has particular reference to a convenient tool for scraping the inside of the bowl of a smoking pipe.v

More particularly, my invention is an improvement over my previous inventions of a pipe cleaner described in my United States Patent No. 1,249,618 and in my copending application for Letters Patent, Serial Number 510,441, `now Patent No. 2,360,560. f In my prior patents it was proposed 'to mount the two pipe scraping blades on Opposite' sides of a handle and to provide springs on the outside oi the handle to exert pressure on opposite ends of the blades-forV urging the same apart and into scraping contactwith the inner face of the pipe bowl.

In the present invention itis proposed to pro vide a simpler and more attractive pipe scraper of neat appearance,` which distinguishes from the prior structures principally in the fact that the spring means is concealed within the handle.

It is further proposed in the present invention to provide interlocking means for the two blades inside the handle and to provide a Single spring bearing on the blades intermediate the lengths thereof, whereby the blades are left free to oscillate about the ends of the spring for adjusting themselves to the shape of the pipe bowl.

Further objects and advantages of my invention will appear as the specification proceeds, and the novel features of my improvements will be clearly defined in the claims attached hereto.

The preferred form of my invention is il1ustrated in the accompanying drawing, forming f part of this application, in which:

Figure 1 shows a front View of my pipe scraper, as applied to the bowl of a pipe;

Figure 2, a similar front view of the pipe scraper, with one plate removed to show the interior construction;

Figure 3, a vertical section through the pipe scraper taken along line 3-3 of Figure 1 with the lower portion of a distant blade omitted; and

Figure 4, a front view similar to that of Figure 2, but with the blades osoillated into a dilerent position.

While I have shown only the preferred form of my invention, I wish to have it understood that various changes or modifications may be made within the scope of the claims hereto attached, without departing from the spirit of my invention.

Referring to the drawing in detail, my pipe scraper I comprises in its principal features, a

handle or manipulating element 2, a pair of blades 3 and a spring 4 bearing on the blades.

The handle 2 is made of two complementary plates 5 and 6, preferably identical in construe tion, and disposed face to face, suitable fastening means such as rivets 1, being provided for securing the plates to one another.

In general outline the plates 5 and 6 are formed to provide a vertical stem 8 and a horizontal crosshead 9 furnishing a handheld for the operator.`

An intermediate, portion I0 of the stem is widened and the two plates making up the stem are formed with off-sets, as at II, to provide a fiat cavity I2 between the same, this cavity, extending through the widened portion from side to side.

The blades 3 are made of thin metal strips and correspond in thickness substantially to the thickness of the cavity, each blade having an outer cutting edge I3 corresponding substantially to the contour of the pipe. The blades are disposed on `opposite sides of the stem and in the plane of the cavity.

Each blade has a pair of ngers I4 projecting into the cavity, the fingers of one pair straddling those of the other, and the fingers being interlocked for limited freedom of lateral motion by means of toes I5.

The spring 4 is interposed between the blades so as to urge the same apart and is accommodated in opposing grooves II in the plates making up the handle. The spring bears upon the blades substantially midway of their lengths so as to allow of a certain amount of oscillating motion about the end of the spring.

The t between the iingers and the toes is sufliciently loose to permit such movement and to allow each blade to adjust itself to the contour of the pipe bowl in connection with which the scraper is used. The spring may be anchored to theblades by means of small projecting prongs I5.

It will be noted that my pipe scraper is extremely simple in construction. The two sections of the handle are exactly alike and may be used interchangeably. They, as well as the blades, may be readily stamped out of any desirable piece of sheet metal or other material.

For assembly, the blades and the spring are placed on one of the handle plates in the manner shown in Figure 2, whereupon the second plate is placed on top and riveted in place.

When inserted into the bowl for scraping purposes, the blades are urged toward one another t0 compress the spring and are free to swing on the outer ends of the spring to adjust themselves to the shape of th'e bowl and they are at the same time urged into scraping contact with the wall of the bowl.

As the scraper is turned, the blades will cut into the layer of carbon or other foreign material usually found on the inside of the pipe bowl, and the spring will tend to force the blades apart and to deepen the cut on successive turns.

I claim:

l. A pipe scraper of `the character described, comprising a pair of complementary plates arranged in face to face relation and having registering intermediate oT-sets to form a iiat cavity between the same, a pair of blades arranged on opposite sides of the plates and having means within the cavity for interlocking the blades with limited freedom of sliding motion, and a spring within the cavity for urging the blades apart.

2. A pipe scraper of the character described, comprising a pair of complementary plates arranged in face-to-face relation and having registering intermediate off-sets to form a flat cavity between the same, a pair of blades arranged on opposite sides of the plates, and having means with'in the cavity for interlocking the blades with limited freedom of sliding motion, and a spring within the cavity for urging the blades apart, the plates being shaped at one end to provide a manipulating handle.

3. A pipe scraper of the character described, comprising a pair f complementary plates arranged in face-to-face relation and having registering intermediate off-sets to form a iiat cavity between the same, a pair of blades arranged on opposite sides of the plates and having fingers extending into the cavity, means for interlocking the ngers within the cavity with limited freedom of sliding movement, and a spring within the cavity for urging the blades apart.

4. A pipe scraper of the character described, comprising a pair of complementary plates arranged in face-to-face relation and having registering intermediate oi-sets to form a fiat cavity between the same, a pair of blades arranged on opposite sides of the plates and having lingers extending into the cavity, means for interlocking the fingers within the cavity with' limited freedom of sliding movement, and a spring within the cavity for urging the blades apart, the plates having lateral extensions at one end thereof to furnish a handle for manipulating the scraper.

5. In a pipe scraper of the character described, a pair of blades arranged in spaced and opposing relation, a pair of fingers extending from one of the blades toward the other and having outwardly projecting toes, a second pair of fingers extending from the second blade so as to ride on the toes and having toes riding on the rst pair of fingers, a spring inside the two pairs of ngers and tending to urge the blades apart, and means for holding the blades and the fingers in coplanar relation.

6. In a pipe scraper of the character described, a pair of blades arranged in spaced and opposing relation, a pair of fingers extending from one of the blades toward the other and having outwardly projecting toes, a second pair of lingers extending from the second blade so as to ride on the toes and having toes riding on the first pair of fingers, a spring inside the two pairs of ingers and tending to urge the blades apart, and means for holding the blades and the fingers in coplanar relation, the latter means having a handhold associated therewith whereby the scraper may be turned.

'7. A. pipe scraper of the character described, comprising a pair of complementary plates arranged in face-to-face relation and having registering intermediate off-sets to form a flat cavity between the same, a pair of blades arranged on opposite sides of the plates and having means within the cavity for interlocking the blades with limited freedom of sliding and rocking motion, and a spring within the cavity for urging the blades apart.

WILLIAM GROCOFF.