US2890455A

US2890455A - Nail driver

Info

Publication number: US2890455A
Application number: US652230A
Authority: US
Inventors: Elmer F Etzkorn
Original assignee: Skil Corp
Current assignee: Skil Corp
Priority date: 1957-04-11
Filing date: 1957-04-11
Publication date: 1959-06-16
Anticipated expiration: 1976-06-16

Description

Jun 16, 1 959 E. F. ETZKORN NAIL DRIVER Filed April 11, 1957 INVENTOR ELMER F. ETZKORN United. States. Patent NAIL DRIVER.

ElmerJF. Etzkorn, Park Ridge,-111.-',1assignor to Ski] Corporation, Chicago, 111., a corporatiomoiiDelaware Application April .11 .1957, Serial No. 652,230

I ZTCLa m -i. (GAIL-429).

The present invention relates to an improvement in a nail driving attachment for power driven hammers. I

In tools" of the pneumatic hammer type, beehive retaining members have been used to hold the impact attachments to the tools so that the attachment might not be ejected from the end of the tool under the force of the impacts thus injuring the operator or fellow worker.

The present invention combines the retaining member and a guide sleeve element for a nail into an attachment that is easily and quickly affixed to or detached from a hammer.

One object of the present invention is to provide an improved unitary attachment for a hammer that Will hold a nail in position for being driven.

Another object is to provide such an attachment that is relatively simple to manufacture and will last longer without repair than other similar devices.

Another object of the invention is to provide an at-tachment wherein the retainer member does not receive unusual wear and tear when the hammer and attachment is in normal use.

Other objects will be apparent to those skilled in the art from a study of the following description and accompanying drawings.

In the drawings:

Fig. 1 is a view in side elevation of a unitary nail driving attachment incorporating one embodiment of the present invention.

Fig. 2 is a view partly in section taken on lines 22 of Fig. 1.

Fig. 3 is a view in section taken on lines 3-3 of Fig. 2.

In the embodiment shown the attachment housing comprises an elongated spiral spring closely wound and formed at 12 to provide resilient attachment means for attaching the same to a tool housing, a retaining portion or means 18 for holding a driven tool or driver in operative position in the

tool housing

16, 37 and a further retainer or abutment means 22 for a nail guiding sleeve 24. Separate spring means 28 is provided for the sleeve 24 so that the constant reciprocation of the sleeve guide will not wear on the main attachment housing.

With reference to the drawings the attachment housing 10 includes a close spiral spring wound to provide an enlarged resilient attachment means 12 at one end that may be screwed over a threaded portion 14 of a hammer tool housing 16 to 'hold the attachment thereto. The housing 16 of the hammer tool and its inset bushing 37 form no part of the present invention. The enlargement 12 may be continued to receive an annular, cup-shaped driver retainer member 18 that may be screwed into the enlargement 12 and will abut against the end of the tool housing 16 as shown when the attachment is fastened thereto. A seat for the retainer member 18 is formed by reducing the housing 10 as at 19. The elongated cylindrical portion 20 terminates in a further reduced sleeve retaining portion 22.

In the lower end of the housing 10, that is, at the end terminating at reduced portion 22, a cylindrical nail guiding and driver'guide's1eeve;24"isslideably; mounted: for

reciprocation within the portion 20. The driver guide" sleeve 24 may have a. shoulder on other retaining'means 26' atits inner end for cooperationwiththe 'sleeve'retainingportion or labu-tment' means. 22 to hold the sleeve.-

. within the portion 20; A spring 'meansshown as aispiral compression spring 28 ismountediwithin thecylindrical portion 20 and has a seat at one end on the'shoulder 26 of sleeve 24 and at the other end againstthe bottomof the cup-shaped driver retainer'member 18 sorthat:sleeve' 24 may be telescoped. within the housing! portion 20.- against the-compression ofispringmeans 28:

To hold the assembly together andttocomplete the attachment, an elongated .driver member 30'extends'through the annular driver retaineramember 1'8 'that.-is.apertured to slideably receive the same, through spi'raltspring 28: Within the cylindrical housing 20 and into driver guide sleeve 24. At its inner end driver member 30 is provided with an anvil extension portion 32 that extends within the tool housing 16 to receive a blow from a reciprocating hammer member, not :shown. A shoulder or stop member 34 or other retaining means may be provided on driver member 30 to cooperate with retaining member 18 to positively prevent driver means 30 from falling out of or being thrown or forced out of the tool when the attachment is properly threaded to the tool housing 16.

In assembling the attachment, sleeve 24 is dropped into the attachment housing 10 from its enlarged end so that shoulder 26 abuts against and is held by the retaining portion 22. Spiral spring 28 is then placed in the cylindrical portion 20 to seat on shoulders 26 of the sleeve 24. Driver retaining member 18 is then screwed into the enlarged portion 12 of the housing until it is seated against the reduced portion 19. Finally driver member 30 is thrust through the apertured retainer 18, through spiral spring 28 and into sleeve 24 until its shoulder 34 abuts against the retainer 18.

When in use, the stem portion 32 of the driver is inserted into the work end of a tool and the enlarged portion 12 of the attachment is screwed onto the threaded muzzle of the tool housing 16 until it meets the retainer 18. The driver 30 should be of sufiicient length to meet the hammer of the tool at its driven or anvil end and extend below the mouth 22 of the attachment. Sleeve 24 may be telescoped backwardly within the cylindrical portion of the housing against the pressure of spring 28 by the work piece into which a nail or workmember is being driven.

Pressure by an operator on a nail in the sleeve 24 by the driving end 36 of the driver member will normally prevent the shoulder 34 of the driver from striking the tool retainer 18. If the tool is operated Without a nail, the retainer 18 and its housing 10 will prevent the tool from being ejected from tool 16 as the shoulder 34 will strike the retainer 18 and the spring housing will take up the shock. With the use of spring 28, which is easily replaceable, there is little normal wear on the housing 10. Were a portion of the housing 10 to be stretched and substituted for spring 28, the constant wear on the stretched portion would mean the replacement of the entire housing.

Other modifications will be apparent to those skilled in the art from a study of the description and drawings where one embodiment is shown and described without departing from the spirit and scope of the invention.

I claim:

1. An attachment for a tool of the type described, comprising an elongated housing, resilient means at one end of said housing to secure the attachment to a tool, a driver retainer positioned in said housing adjacent said resilient means, a driver guide telescopically mounted 3 in said housing and normally extending from the endof said housing remote from said driver retainer, abutment means to limit outward movement of said driver guide, and a compression spring engaging said driver retainer and said driverguideto biassaid driver guideoutwardlyl of said housing, land a drivertmembert extending through said drivertretainer and into said driver. guide.

2. An attachment for a tooltcomprising a resilient housing including means to secure the attachment to a.

tool and having an interior. shoulder and a driver guide retaining portion, a driver guide mounted in said driver guide retaining portion and a driver retaining means mounted aganst said interior shoulder, spring means mounted between said driver retaining means and said 2,890,455 I a I 3. A nail driving attachment for a tool of the type described comprising an elongated spiral spring closely wound and formed to provide a housing, a housing attaching means, at one end, and a driver guide retaining means at the other end, a driver retaining member in said housing adjacent said housing attaching means, a driver guide telescopically mounted in said housing normally extending outwardly thereof through said driver guide retaining means, spring means mounted in said housing to yieldingly hold said driver guide in extended position, and a driver extending through said driver retaining member and into said driver guide.

References Cited in the file 'of this patent UNITED STATES PATENTS 1,699,519 Brown Ian. 22, 1929 2,325,728 Allen Aug. 3, 1943 2,417,490 Hewes Mar. 18, 1947 2,671,216 Fox Mar. 9, 1954 2,747,186 Fox May 29, 1956