Pneumatic percussion tool having a vibration dampened handle

Claim 2

A portable pneumatic percussion tool having a barrel; pneumatically actuated apparatus in the barrel; a vibration-dampened handle secured at one end of the barrel and including a hand-grasping section having an air pressure supply passage therein; a cushion member of resilient rubber disposed between the handle and barrel; a pair of metal plate coupling members each on opposite sides of the cushion member and each bonded thereto; the coupling members and cushion member having aligned air pressure supply passages extending therethrough; a unitary, oil-resistant, one-piece, resilient linear which completely lines the air supply passages of said members; the resilient liner having first and second integral flanges extending laterally along the outer face of each coupling member and circumjacent the air pressure supply passage; each flange having an outer face extending beyond the adjacent outer face of the coupling member to provide an annular sealing gasket between each respective coupling member and its adjacent handle and barrel; and means for securing each respective coupling member to its adjacent handle and barrel with the annular sealing gasket compressed sufficiently to provide an airtight seal.

Claim 3

A portable pneumatic percussion tool having a barrel; pneumatically actuated apparatus in the barrel; a vibration-dampened handle secured at one end of the barrel and including a hand-grasping section having an air pressure supply passage therein; a cushion member of resilient rubber disposed between the handle and barrel; a pair of coupling plates each on opposite sides of the cushion member and each bonded thereto; the coupling plates and cushion member having aligned air pressure supply passages extending therethrough; a unitary, oil-resistant, one-piece, resilient liner which completely lines the air supply passages of said members; the resilient liner having flanges extending laterally along the outer face of each coupling plate to provide an annular sealing gasket between each respective coupling member and is adjacent handle and barrel; first fastener means for securing one coupling plate to the barrel with the annular sealing gasket compressed sufficiently to provide an airtight seal; and second fastener means, separate and distinct from the first fastener means, for securing the handle to the other coupling plate with the annular sealing gasket compressed sufficiently to provide an airtight seal; whereby each respective coupling plate is secured to its adjacent handle and barrel.

Claim 4

A portable pneumatic percussion tool having a barrel; pneumatically actuated apparatus in the barrel; a vibration-dampened handle secured at one end of the barrel and including a hand-grasping section having an air pressure supply passage therein; a cushion member of resilient rubber disposed between the handle and barrel; a pair of coupling plates each on opposite sides of the cushion member and each bonded thereto; the coupling plates and cushion member having aligned air pressure supply passages extending therethrough; a unitary, oil-resistant, one-piece, resilient liner which completely lines the air supply passages of said members; the resilient liner having flanges extending laterally along the outer face of each coupling plate to provide an annular sealing gasket between each respective coupling member and is adjacent handle and barrel; first fastener means for securing one coupling plate to the barrel with the annular sealing gasket compressed sufficiently to provide an airtight seal; and second fastener means, separate and distinct from the first fastener means, for securing the handle to the other coupling plate with the annular sealing gasket compressed sufficiently to provide an airtight seal; whereby each respective coupling plate is secured to its adjacent handle and barrel.

Claim 5

A portable pneumatic percussion tool as set forth in claim 2 wherein the inner face of each coupling plate is sand blasted; and the means for bonding the coupling plates to the cushion member comprises an adhesive bond coat secured to the sand blasted face and the cushion member.

Claim 6

A portable pneumatic percussion tool as set forth in claim 2 wherein the oil-resistant, resilient liner is formed of a material of the type having oil resistant characteristics such as neoprene.

Claim 7

A portable pneumatic percussion tool having a barrel; pneumatically actuated apparatus in the barrel; a vibration-dampened handle secured at one end of the barrel and including a hand-grasping section having an air pressure supply passage therein; a cushion member of resilient rubber disposed between the handle and barrel; a pair of coupling members each on opposite sides of the cushion member and each bonded thereto; the coupling members and cushion member having aligned air pressure supply passages extending therethrough; a unitary, oil-resistant, one-piece, resilient liner which completely lines the air supply passages of said members; the resilient liner having flanges extending laterally along the outer face of each coupling member to provide an annular sealing gasket between each respective coupling member and its adjacent handle and barrel; each coupling member having an annular groove in its outer face surrounding its air pressure supply passageway; each flange of the resilient liner being disposed in the corresponding groove and having a thickness greater than the depth of its corresponding groove; and means for securing each respective coupling member to its adjacent handle and barrel with the annular sealing gasket compressed sufficiently to provide an airtight seal.

Claim 8

A portable pneumatic percussion tool having a barrel; pneumatically actuated apparatus in the barrel; a vibration-dampened handle secured at one end of the barrel and including a hand-grasping section having an air pressure supply passage therein; a cushion member of resilient rubber disposed between the handle and barrel; a pair of coupling members each on opposite sides of the cushion member and each bonded thereto; the coupling members and cushion member having aligned air pressure supply passages extending therethrough; a unitary, oil-resistant, one-piece, resilient liner which completely lines the air supply passages of said members; the resilient liner having flanges extending laterally along the outer face of each coupling member to provide an annular sealing gasket between each respective coupling member and its adjacent handle and barrel; each coupling member having an annular groove in its outer face surrounding its air pressure supply passageway; each flange of the resilient liner being disposed in the corresponding groove and having a thickness greater than the depth of its corresponding groove; and means for securing each respective coupling member to its adjacent handle and barrel with the annular sealing gasket compressed sufficiently to provide an airtight seal.

Claim 9

A portable pneumatic percussion tool as set forth in claim 5 wherein each groove is L-shaped and its corresponding flange is shaped complementary thereto.

Claim 10

A portable pneumatic percussion tool as set forth in claim 6 wherein the inner face of each coupling member is roughened; the cushion member is formed of a natural rubber; the means for bonding the coupling member to the cushion member comprises an adhesive bond coat secured to the roughened face and the cushion member; and the oil-resistant, resilient liner is formed of neoprene.

Claim 11

A shock absorbing and vibration damping insert for location between the handle and percussion mechanism of a portable pneumatic percussion tool and comprising, in combination: a cushion member of resilient rubber; first and second metal coupling members bonded to opposite sides of the cushion member; the members having an air supply passage extending therethrough; an oil-resistant, resilient element completely lining the air supply passage; at least one of the coupling members having a groove in its face remote from the cushion member and surrounding the terminus of the air supply passage; and the resilient element having a circumjacent flange disposed in the groove and having an outer face beyond the adjacent outer face of the coupling member to provide a sealing gasket.

Claim 12

A shock absorbing and vibration damping insert for location between the handle and percussion mechanism of a portable pneumatic percussion tool and comprising, in combination: a cushion member of resilient rubber; first and second metal coupling members bonded to opposite sides of the cushion member; the members having an air supply passage extending therethrough; an oil-resistant, resilient element completely lining the air supply passage; at least one of the coupling members having a groove in its face remote from the cushion member and surrounding the terminus of the air supply passage; and the resilient element having a circumjacent flange disposed in the groove and having an outer face beyond the adjacent outer face of the coupling member to provide a sealing gasket.

Claim 13

The combination of claim 8 wherein there is a similar groove in the remote face of the other coupling member, and the resilient element has a similar circumjacent flange thereat.

Claim 14

The combination of claim 9 including a plurality of openings extending through said other coupling member and the cushion member, the said one coupling member having aligned openings of smaller size to provide a shoulder against which the head of a fastener can bear; and the other coupling member having a plurality of threaded openings therein for reception of other fasteners.

Claim 15

In a portable percussion tool including a barrel, an impacting element slidably arranged in the barrel, valve means in the barrel to direct oil ladened pressurized air alternately to opposite ends of the impacting element to cause reciprocal movement thereof, a handle for positional control of the tool, and an air supply passage formed in the handle for conducting the air to the valve means, the improvement comprising: a separable vibratory dampening unit disposed between the barrel and the handle providing the sole connecting means coupling the handle to the barrel in end to end relationship, said unit being formed to provide an air passage therethrough to communicate the supply passage with the valve means, and the unit having an oil resistant liner disposed within said air passage for the full axial dimension of the unit.

Claim 16

In a portable percussion tool including a barrel, an impacting element slidably arranged in the barrel, valve means in the barrel to direct oil ladened pressurized air alternately to opposite ends of the impacting element to cause reciprocal movement thereof, a handle for positional control of the tool, and an air supply passage formed in the handle for conducting the air to the valve means, the improvement comprising: a separable vibratory dampening unit disposed between the barrel and the handle providing the sole connecting means coupling the handle to the barrel in end to end relationship, said unit being formed to provide an air passage therethrough to communicate the supply passage with the valve means, and the unit having an oil resistant liner disposed within said air passage for the full axial dimension of the unit.

Claim 17

The combination of claim 11 wherein the vibratory dampening unit includes a pair of coupling plates each on opposite sides of a cushion member and each bonded thereto; and including first fastening means for securing one coupling plate to the barrel, and second fastening means, separate from the first fastening means, for securing the handle to the other coupling plate.

Claim 18

The combination of claim 12 wherein the coupling members have fluid supply passages communicating with the passages in the handle and through the cushion member; and the liner means extends along the full length of the passages through the cushion and coupling plates.

Claim 19

The combination of claim 13 wherein the liner means has flanges extending laterally along the outer face of each coupling plate to provide an annular sealing gasket between each respective coupling plate and its adjacent handle and barrel.

Claim 20

The combination of claim 14 wherein the liner means is formed of a material of the type having characteristics similar to neoprene.

Claim 21

The combination of claim 15 wherein the cushion member is formed of natural rubber.

Claim 22

For use in combination with the handle and barrel members of a pneumatic percussion tool wherein the handle has an inner flat face provided with an axial passage for conducting operating air to the barrel member and the barrel member has an opposed rear end face provided with an axial passage for reception of said air, a separable vibration dampening unit for detachably coupling the handle to the barrel member, the unit comprising a pair of parallel end plates, a cushion disposed between the plates having one end face bonded to an inner face of a first one of the plates and an opposite end face bonded to an inner end face of the other plate, apertures extending through the unit adapted to receive bolts for detachably bolting the unit to the rear end face of the barrel, threaded apertures in the said first one of the end plates adapted to receive mounting bolts passed through the inner flat face of the handle, the unit having an axial passage alignable with the passages in the handle and barrel, and an oil-resistant liner fitted in the said axial passage of the unit for the full length thereof.

Claim 23

For use in combination with the handle and barrel members of a pneumatic percussion tool wherein the handle has an inner flat face provided with an axial passage for conducting operating air to the barrel member and the barrel member has an opposed rear end face provided with an axial passage for reception of said air, a separable vibration dampening unit for detachably coupling the handle to the barrel member, the unit comprising a pair of parallel end plates, a cushion disposed between the plates having one end face bonded to an inner face of a first one of the plates and an opposite end face bonded to an inner end face of the other plate, apertures extending through the unit adapted to receive bolts for detachably bolting the unit to the rear end face of the barrel, threaded apertures in the said first one of the end plates adapted to receive mounting bolts passed through the inner flat face of the handle, the unit having an axial passage alignable with the passages in the handle and barrel, and an oil-resistant liner fitted in the said axial passage of the unit for the full length thereof.