US1665173A - Hammer attachment for electric drills and the like - Google Patents

Description

April 3, 1928.

Filed Aug. 10, 1925 INVENTOR.

WM SM QM 6-+.'6,.Fig. "1; i i

' My invention comprises generally, an else- Patented Apr. 3, 19128.

umzrse sia This JOHN nuisance, or sizmcosn YORK. o

QPATEEZNT car es.

& i [1,665,173

application filed August 1041925. 's iiai 'fio; teams.

My invention relates to halnl'll'lvjfll'tilfanism, and has for its object a partlcul'a'i ly simp'le' hammer attachment forelect ric drills and'th'e like, Which'can 'b 'quichly andeasily attached and detached and is highly *efiicient and durable in use.

The invention consists *in the novel features and in the combinatlons' and constructions heremafter set forth and claimed.

' In describing -this invention reference is had to the accompanying drawings in like characters designate I "corresponding parts in all the views.

Figured is-aside elevation partly in scc- I 'tion of an electric drill with my hammer attachment fixed thereto. I

I F igure Zisa face view of one 0f the lifting ciams. II

Figure 3 isa se'ct'ional vi w taken'on line Figure *4 is a: longitudinal sectional "view of the reversible collar for holding the tools. v

Figure 5 is an end elevation of the collar shown in Fig. 4.

Figure 6 is a sectional View taken on ime trio drill including the us'i'1al -fevolvingichuck and a body portion for-supporting said i volving chuck, "hammer mechanism ln'c'luding a'ca'sin'g and a reci rocating heath-means for attaching the casing of the hammer mechanism to "the 'bodyy po'rtio'n off the "elec- -tric drill, and means forconrieictirig the re- 'ciprocatmg head to the revolving chuck for "operating 1 said reciprocating head.

In the drawing 1 represents an "electric drill of any Well know'n type, having the I usual frame or body portion 2 "enclosing an "electric motor; and the usual chuck or tool holder 8, mounted on *the 'power shaft aof said-electric motor. I

The hammer mechanism as here shown comprises acasing 5, and a reciprocating hammer head 6 mounted therein.

The casing 5 as'here shown is cylindrical in general form and the front end 7 of the I body 2 of the electric drill is circular and is formed near said front end With a shoulder 8. The rear end of the casing 5 fits over said front end and abuts against the shoulder 8 and is secured thereto as by the screws 9,

'Any other desirable means of fastening the casing of the hammer mechanism to the "used.

1 The front end of the easing 5fas h r shown is formed withan inturhed flange 10 "and 'a member llis seated therein and is formed with a reduced threaded cdllar {12 extending through said front "end and With "Ran :nxia'l passage 13 extending therethrough "forming' a hearing for the hammer head The inner end face 'of the member l'li is formed with teeth 14 airound the passage 13," I

"oviding eam sur faces I5 to-be i said teeth p hereinafterdescribed. Y I I The har'ni'ner head "6 'ext'ends through the passage 13 and "as shown in body portion of the 'e'letric aim ma he I Fig. *1; is formed with an enlarged portion 16 intermediate its I ends and said enlarged portion isforined with te th 1:7 havifigfca m surfaces enacti g :with the eam su rfacjes =15 on the part 131 The enlarged :po'i tion' :16 o'f"t'h'e hamm'er head 6 is preferably made separate fron the "shank -=thereof and herej shown is fixed thereto b y the ;pin 18. The inner end thereof is ipreferably reces ed as *at 19, and (a compression Sprin g' -QO is interposed between the hotttnnoi the recess pOrt'iOnJQ' andthe ehuck'S.

A2 1 is a power shaft "which is cla'mped in *the chuck?) in :pl'a'c'e fofthe' usual 'drill and in the samema nner; i I

-I have here shown the inn'er' end -of the hammer head 6 as being couhterboredand 1 formed With adengtlrwise "slot. 22 extendii'ig diametricallfv-therethrough. I i Thefouter endof 'he power sha ft slidabl'gv fits said counterbore and is pmvided with aipin 28 wliich'co'actswith theslotIQ Q, there-' As Willbe obvious to thoseskilled in the' art the number of'teeth or'cam surfaces on the coacting backs Will determine the 'numher of strokes per. revolution of thepower ion 7 l threads upon the reducedcollar 12 of the v of the casing;

I have here shown four teeth 011 each of the coacting parts, butv obviously any desirable number may be provided.

For convenience of manufacture and assembling the part 11 is held from rota- :tion with respect to the casing by meansof the spring pressed dowel pins 24: coacting with'aligned holes in the inturnedflange 10,

and as shownin Fig. 1, is locked in posi tion by means of thetoolfholder 25 which part 11 and againstfthe inturned flange In tools of this description the hammer head does not as a rule act directly upon the :work', but acts upon a tool'as forins'tance the tool 26 which is here shown as a star drill having a hexagonal shaped orcsi-x' sided shank. Vhen using a-tool in tho-holder of the type illustrated'it is desirable that .thetool should. change its striking point at every blow of the hammer, while withother types-of tools it is essential :that the tool used in the holder docs not change its striking point.

In 'my' invention-.1 have provided a construction whereby simply reversing the-position of one 111Gl1'1b8r,'tl1(311001WVlll have an axiallmovementor will-not have an axial movement. q x

27 is the reversible member and as shown in F1gs.,1, land 5. compr1ses a sleeve fitting within the tool holder 25, the inner diameter of oneend as 28. being round approximately *one third of, its length andslidably fitting the outer diameter of the shank'of the hammer head 6.' The rest-of the sleeve on the inside is cut hexagonal or out of round, .as shown at 29, with the corners thereof a continuation of the inner-diameter of the round [portion 28. The outer endBO of the ham I merheadG extend's intothe sleeve 27' and the tool-26 are .in the hexagonal portion of the sleeve, therefore the sleeve and-consequently the tool 26 will beturned'when the head is operated.

l 1. A hammer mechanism :CfiSlIlg, a tool holder fixed to one end of sand When the sleeve 27 is reversed that is turned end for; end, the round portion 28 of the sleeve is on the hexagonal portion 30 of e the hammer head, obviously neither the sleeve northeto'ol' 26 will be turned. 7

The sleeve is heldin place by the screw cap 31 which is'provided with a packing 32 to prevent dust and dirt from getting into the hammer and to prevent grease from leaking out. 33 is a grease plug for supplying. grease to the hammer attachment.

' This hammer attachment is the reverse of the hammers now in use, as when the operator wants to strike a very light blow, he I forces the tool as close to the work as possible and when he desires a heavier'blow he lets up on the pressure. 7 I

/Vhat I claim is casing, a revolving and reciprocating head 'in said casing having one end thereof ex comprising a' a tcndinginto one end of saidtool holder and provided with a non-circular portion, atool having anoncircular portion extending into the other end of said tool holder, and a reversible means arranged in said tool holder to coactwith the non-circularrportions of the reciprocating head and the tool to turn the tool when the head reciprocates,

or to .coact with only one of said non-circular portions, whereby the tool does not turn when the head reciprocates.

2. A hammer mechanismcomprising a-casing, a tool holder fixed to one end of' said casing, a revolvlng and reciprocatlng'head 111 said casing having oneendthereof extending into one end of said tool holderand 'pro vided with a noncircular portion, a toolhaving a noncircular portion'extending into the other end of said tool holder, and a sleeve having a circular portion and a noncircular portion reversibly mounted in said tool holder so that thcnoncircular por tion coacts with thenoncircularportions of the head and tool or is reversed to coact withonly one of sa1d parts;

In testimony whereof, I have hereunto .signedmy name,'at Syracuse, in the county ofOnondagmand State-of New York, this 18th'day of July, 1925.

JOHN I-. -M1sEivnR.

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