US1634298A

US1634298A - Bush hammer

Info

Publication number: US1634298A
Application number: US141801A
Authority: US
Inventors: John J Padbury
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-10-15
Filing date: 1926-10-15
Publication date: 1927-07-05
Anticipated expiration: 1944-07-05

Description

July 5,1927 V ,6 98

J...J. FADBURY BUSH HAMMER Filed Oct. 15, 1926 lvvmznioz doH/vd Pa al/ r Patented July 5, 1927.

UNITED STATES JOHN J. PALDBURY, OF BARRE, VERMONT.

BUSH HAMMER.

Application filed October 15, 1926. Serial No. 141,801.

This invention relates to .stone cutters bush hammers.

An important objectof the invention is to provide a bush hammer having the usual cutting blades and means for positively securing the blades in position whereby they are prevented from loosening during the operation of the hammer.

A further object is to provide a hammer v19 of the type referred to provided with a locking key of a novel type for secure y locking the blades against movement.

A further object is to provide a hammer of the type referred to provided-with a thrust plate or looking member arranged above the blades and having portions contacting therewith to prevent lateral movement thereof, and a locking key which .is adapted to be driven into position to clamp the blades in posit-ion and also to tightly clamp the thrust plate and hold the ends of the blades in contact with the thrust plate.

A. further object .is to provide a hammer of the type described wherein the parts are readily removable and replaceable.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the drawings I have shown one embodiment of the invention. In this showing:

Figure 1 is a side elevation,

Figure 2 is a section on line 22 of F ig- 35 ure 1, parts being shown in elevation;

Figure 8 is a transverse sectional view on line 3-8 of Figure 1, and,

Figure 4 is a detail perspective of the key and thrust plate detached.

Referring to the drawings, the numeral designates the body of the hammer as a whole including an enlarged head 11 and a shank of the usual type 121 The head 11 is provided with handle attaching sockets 13. The head is further provided in its lower end with a recess indicated as a whole by the numeral 14 in which elements to be described are adapted to be received. The recess 14 is provided with an upper wall 15 arranged substantially at right angles to the axis of the shank, and this wall is provided centrally thereof with a socket 16. One side wall 17 of the recess 14 is arranged sub stantially parallel to the axis of the shank 12 while the opposite wall 18 is slightly inclined .and is provided with a groove 19 for a purpose to be described.

A thrust plate 20 is arranged in the upper end of the recess 14 and includes a relatively flat body 21, the upper face of which is adapted to lie against the wall 15 as shown in Figure 2. A lug 22, preferably circular to assistin preventing lateral movement of the'thrust plate as will be apparent. The ends of the thrust plate are provided with upwardly extending flanges 23 extending throughout the width of the thrust plate and adapted to snugly contact with opposite sides of the head 11 as clearly shown in Figure 2. The ends of the thrust plate are further provided with depending flanges 24 which extend from one side of the thrust plate to a point spaced from the opposite side, as indicated at 25. A plurality of blades 26 of the usual type are arranged with their upper ends in the recess 14, the

'upper extremities of the blades being arranged against the lower face of the thrust plate 20 and snugly fitting between the flanges 24. The outer face of one of the outermost blades snugly fits against the wall 17 of the recess 14 as shown in Figure 1.

The numeral 27 designates a locking key provided on one side with a longitudinally extending flange 28 adapted to be received in the groove 19. As shown in Figures 1 and 4, the key 27 is tapered to decrease in thickness toward its lowerend, while it is also tapered longitudinally to decrease in thickness toward one end as shown in Figure 3. The groove 1.9 is adapted to serve as a guide for the locking key, and the flange 28 fits fairly loosely in the groove 19 to permit slight vertical movementof the key for a purpose to be described. As shown in Figure 1, the upper end of the key 27 contacts with the lower face of the body por. tion of the thrust plate 20, the flange 24 being cut away as at for this purpose.

The operation of the device is as follows: The thrust plate 20 is first arranged in position and is held in position with the upper face of the body portion thereof snugly contacting with the wall 15 of the recess 14. The blades 26 are then arranged in posi tion with their upper extremities contacting with the lower face of the body of the thrust plate whereupon the key 27 is driven into position. As previously stated, the key is incross section, is mounted in the socket 16 tapered both vertically and longitudinally, and the ,longiti linal taper serves to clamp the blades snugly against each other, and against the wall 17 and the inner face of the key 27. The vertical taper ot' the key serves to cause the latter together with the blades 26 to move upwardly whereby ,both the key and the blades will be driv'ei'i into snug contact with the lower face of -the thr st plate while the latter also will be driven upwardly in-to'snug cont-act with the wall 15 oif'the recess. Thus it will be apparllll tl1llli all off the removable elements of the device are .moved upwardly when the key is driven into position, while the key and the blades are claniped transversely of the head 11. The various contacting faces of the device are preferably machined to substantially perfect whereby very slight movement of the parts is necessary to effect the clamping act-ion. In practice it has been found that the hammer may be operated through long intervals of time without caus ing any of the parts :to become loosened, while the simplicity and ruggedness of the parts permits long operation of the device without breakage. r

It is to be understood that the iorm ot the invention herewith shown and descrihet is to be taken as a preferred example of the same and that various changes in the shape, sizeia-nd arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

I claim:

1. A. bush hammer comprising a head. having a blade receiving recess in its lower end, a plurality of blades arranged with their upper ends in said recess, a thrust plate mounted in the upper end of said recess, said plate having end portions engaging opposite faces of said head and opposite e(; ges of said blades, and a key adapted to be driven between one wall of said recess and the outer face of the adjacent blade, the upper edge oi said hey being adapted to contact with said thrust plate, the wall of said recess adjacent said key being provided with a guide groove. and a flange carried by said key and adapted to be arranged in said groove.v I H i 2. A bush hammer comprising a head hav ing a blade receiving recess in its lower end, a plurality of blades arranged with their upper ends in said recess, a thrust plate mounted in the upper end o'l said recess, said plate having end portions engaging opposite tad of said head and op'positeedgtes of said blades, and adapted to be driven between eiie wall of said recess and the outer wall of said recess being inclined whereby 7 face of the adjacent blade, said key being tapered. longitudinally to decrease in thickness toward one end and being further ta pered to decrease in thickness toward its lower edge, the upper edge of said key being adapted to contact with said thrust plate.

,3, A, bush hammer comprising a head having a blade receiving recess in its lower end, a plurality of blades arranged with their 7 upper ends in said recess, one side wall of said recess being arranged parallel to and adapted to contact with the outer face of one of the outermost blades, the other side said recess decreases in w-idtl toward its lower end, said last named side wall being provided with a groove extending thereacross, a thrust plate mounted in the upper end of said recess, said. plate having end portions engaging'opposite faces oi said head and opposite edges of said blade, and a key adapted to be driven between the inclined side wall of said recess and the outer face of the adjacent blade, said hey being tapered longitudinally to decrease in thicln ness towardone end and being tapered vertically to decrease in thickness toward its lower edge, said hey being provided on its outer face with a flange adapted to be received in said groove.

4-,. A bush hammer comprising a head having a blade receiving recess in its lower end, a plurality 01 fiat blades arranged with their upper ends in said recess, one side wall 0 said recess beingarranged parall l to a adapted to contact with the outer 1 one Of the outermost blades, the other v wall oi? said recess being inclined whereby said recess decreases in width toward its lower end, said last named side wall being further inclined whereby said rec as decreases in width toward one longitudinal end, the upper wall oi --id recess being provided with a central set, a thrust plate arranged in the upper and of said recess and provided. on its upper face with :1. lug ar ranged in said socl' said plate being provided at opposite ends with u ivwardly extending flanges engaging against opposite 'faces of said head and being :lnrther provided with downwardly, extending iiaiigjes adapted to engage opposite edges of said blades, and a key adapted to be driven between the inc-lined side wall of said recess 1 and the outer face of the adjacent blade, said hey being: tapered to decrease in thickness toward one end and being further tapered to; decrease in thickness toward its lower edge. p V 1 in testimony whereof; I aliix my signature.

JOHN J. 'ran'nn'nv.