US2565279A

US2565279A - Electric hammer

Info

Publication number: US2565279A
Application number: US106267A
Authority: US
Inventors: Tamborello Frank
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-07-22
Filing date: 1949-07-22
Publication date: 1951-08-21
Anticipated expiration: 1968-08-21

Description

Aug. 21, 1951 F. TAMBORELLO 2,555,279

ELECTRIC HAMMER Filed July 22, 1949 E l I IN VEN TOR.

62ml 5ML/5MM@ Patented Aug. 21, 19511 UNITED STATES PATENT OFFICE ELECTRIC HAMMER Frank Tamlicrello, Milwaukee, Wis. Application July 22, 1949, serial No. 106,267

5 Claims-V 1 This invention relates to improvements in electric hammers.

Electric hammers as heretofore developed have been very useful and labor saving devices. They have not, however, been usable in many applications because of the bulkiness of said devices which prohibited their use in limited or in constricted spaces. Prior electric hammers have been of complicated construction and have used coil springs in conjunction with thehammer plungers thereof. Coil typ-e springs necessarily resulted in bulkiness of the complete hammer assemblage.

It is a general object of the present invention to provide an electric hammer which is of such shape that it is adapted for use in constricted places which were heretofore inaccessible for con= ventional electric hammers.

A further object of the invention is to provide an electric lhammer of the class described which has a body section of relatively small cross-sectional size.

A further object of the invention is toprovide a hammer of the class described which `reduces operation fatigue by reason of having relatively few working parts at the hammer plunger end thereof. Y A further object of the invention is to provide a hammer of thel class described which is particularly well adapted for auto body and fender work. by reason of its being provided with an lelchgated supporting housing or body.

A further object of the invention is to provide a hammer of the class described which employs a band spring in conjunction with the hammer plunger, rather than a coil Spring.

A further Obiet 0f the invention to, provide a hammer of the class described whicllis YSQ ,con-2 Structed that the hammer plunger and the band Spring coactins therewith can be quickly removed from the assembly by removing a readily reviewA able cover for a portion ofthe hammer housing.

A further object of the invention is to provide a hammer of the class described having an elongated drive shaft formed with a double cam portion adjacent one end, said cam portion driving'ly engaging a hammer plunger which extends at substantially a right angle thereto.

A further object of the invention is to provide a hammer of the class described wherein the drive shaft cams each engage different pcrtions of the hammer plunger.v

A further object of the invention is to provide an electric hammer of the class described which is simple in construction, easy and inexpensive to manufacture, and which is otherwise well adapted for the purposes described.

With the above and other objects in view, the invention consists of the improved electric hammer and all of tsparts and combinations, as set forth in the claims and all equivalents thereof.

In the drawing accompanying and forming a part of this specication wherein is shown one complete embodiment of the preferred form of the invention, and wherein the same reference characters indicate the same parts in all of the views:

Fig. 1 is a side elevational view of the improved hammer with parts broken away and shown in longitudinal vertical section;

Fig. 2 is a transverse vertical sectional view taken approximately along the line 2 2 of Fig. 1; and

Fig. 3 is a transverse vertical, sectional view taken along the line 3-3 of Fig. 1.

Referring more particularly to the drawing, `the numeral 5 indicates an elongated tubular housing kor supporting member having connected to one end thereof, as by the flanged connection shown, an electric motor Ii. The motor 6 is formed with. a manually engageable handle i which may be provided with a trigger type electric switch 8 for controlling the motor operation.

At the opposite end of the housing e is fixed .a shaft bearing 9 in which is `rotatably supported one end of an elongated drive shaft I0 which projects from and is driven by the motor E. Adja cent the end thereof mounted in the bearing S, the shaft Iii is formed with one or more cams I i, preferably as shown. The drive shaft Ill may loe Iformed of two sections which may be connected by va coupling I0'.

The housing 5 has a cut-away upper portion i?! extending from a point intermediate its length to the end adjacent the vbearing 9, as shown. A. cover I3, having a generally U-shaped cross sec-- tion, is removably connected to the housing 5 and fits over the cut-away portion I2 thereof, there "being suitable connecting means, such as screws VI 4 for making said connection.

The cover I3 is formed with a bearing sleeve or boss I5 adjacent the cams II of the shaft Iii. A hammer plunger I6 is slidably positioned in the, bearing boss and is formed with an external head Il. Rei'llovably` fixed at one end to intermediate upper portion of the cover iii a cantilever leaf or band spring I8 which extends ansularlv toward the bearing 9 and rests thereon as shown. The spring lI8 is preferably welded to the inner end of the hammer plunger I6, as shown, and is provided on its opposite side with an integral metallic pad I9 having an arcuate surface which is held by said spring in contact with the cams II of the drive shaft Il). The hammer plunger I6, the pad I9 and the spring I8, therefore, form a single unit, and the pad I9, in effect, acts as the head of the plunger It for engagement by the cams II.

In operation, as the drive shaft I is rotated, one of the cams II pushes the hammer plunger I outwardly and also thereby deects the spring I8. As the cam I I continues to rotate, it moves away from the pad I9 and permits the spring I8 to retract the hammer IS. Upon such retraction, the other cam II engages the pad I9 and pushes it outwardly for the next oscillatory movement.

The improved hammer, by reason of its small cross-sectional size, is well adapted for use in many places where only a limited amount of working space is available. By removing the cover I3, the hammer plunger and the spring I8 are simultaneously removed therewith, thereby facilitating quick inspection or replacement of said parts.

The elongated shape of the housing 5 permits the improved hammer to be used by one operator in many applications where formerly two operators were required. For example, in auto fender Work, the operator can hold the hammer against the under side of the fender and observe the work as it progresses from the upper side. With conventional hammers it is frequently necessary for the auto wheels to be removed and for one operator to be underneath the fender to hold the hammer while a second workman observes the progress of the work from the upper or outer side of the fender.

The likelihood of failure of the hammer plunger is greatly reduced in the improved hammer due to the fact that each of the cams II does not engage the same point on the pad I9.

Frictional heat which may `cause hammer plunger failure is thereby greatly reduced.

Various changes and modifications may be made without departing from the spirit of the invention, such as changes in the specific structural association of the plunger I6 with the spring I8 and the cams II, and all of such changes are contemplated as may come within the scope of the claims.

What I claim is:

1. In an electric hammer, an elongated tubular housing having a cut-away upper portion adjacent one end; an elongated longitudinally extending cover for said cutaway portion removably connected to said housing, a drive shaft extending longitudinally of and rotatably supported in said housing; a hammer plunger, said cover having means for slidably supporting said plunger at an angle to said drive shaft; at least one cam on said drive shaft engageable with said plunger to cause axial movement of the latter upon rotation of said shaft; and a leaf spring connected to said cover and extending longitudinally of the housing for urging said plunger into engagement with said cam.

2. In an electric hammer, an elongated tubular housing having a cut-away upper portion adjacent one end; an elongated longitudinally extending removable cover for said cut-away portion connected to said housing, a drive shaft eX- tending longitudinally of and rotatably supported in said housing; a hammer plunger, said cover '4 having means for slidably supporting said plunger at an angle to said drive shaft; at least one cam on said drive shaft engageable with said plunger to cause axial movement of the latter upon rotation of said shaft; and a leaf spring connected to said cover and extending longitudinally of the housing and integral with said plunger for urging said plunger into engagement with said cam.

3. In an electric hammer: an elongated tubular housing having a cut-away portion adjacent one end; a cover for said cut-away portion removably connected to said housing; a sectional drive shaft extending longitudinally of and rotatably supported in said housing, said housing cut-away portion being of sufficient length to provide for removal of one of said drive shaft sections therethrough; an axially slidable hammer plunger carried by said removable cover at an angle to said drive shaft; at least one cam on the removable section of said drive shaft and engageable with said plunger to cause axial movement of the latter upon rotation of said shaft; and a leaf spring carried by said removable cover and extending longitudinally of the housing for urging said plunger into engagement With said cam.

4. In an electric hammer: an elongated tubular housing having a cut-away portion adjacent one end; a cover for said cut-away portion removably connected to said housing; a sectional drive shaft extending longitudinally of and rotat ably supported in said housing, said housing cutaway portion being of sufficient length to provide for removal of one of said drive shaft sections therethrough; an axially slidable hammer plunger carried by said removable cover at substantially a right angle to said drive shaft; at least one substantially U-shaped cam formed on the removable section of said drive shaft and engageable with said plunger to cause axial movement of the latter upon rotation of said shaft; and a leaf spring carried by said removable cover and extending longitudinally of the housing for urging said plunger into engagement with said cam.

5. In an electric hammer: an elongated tubular housing having a cut-away portion adjacent one end; a cover for said cut-away portion removably connected to said housing; a sectional drive shaft extending longitudinally of and rotatably supported in said housing, said housing cutaway portion being of sufficient length to provide for removal of said drive shaft sections therethrough; an axially slidable hammer plunger carried by said removable cover; at least one substantially U-shaped cam formed on the removable section of said drive shaft and engageable with Said plunger to cause axial movement of the latter upon rotation of said shaft; and a leaf spring carried by said removable cover and extending longitudinally of the housing and integral with said plunger for urging said plunger into engagement with said cam.

FRANK TAMBORELLO.

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

UNITED STATES PATENTS Number