Tool holder

Claim 2

A tool holder having a rotatable drive sleeve adapted to receive therein a tool and having a closed-ended slot disposed axially along part of its length, characterized in that it comprises: a member (44) having longitudinal side surfaces (18) extending axially of said sleeve (8) and extending inwardly into said slot (24), said member (44) being movable through said slot for retaining and rotatably driving a tool when present, and having a part (52) external of said sleeve for limiting inward movement of said member (44) when the tool is absent; locking means (66) encircling said sleeve and movable axially in one direction for locking said member .(44) in engagement with the tool when present, and movable axially in the opposite direction to a position to allow disengagement of the tool; and a spring (56) acting upon said member (44) to urge resiliently inwardly said member to an inward position in the absence of the tool, and into contact with the tool when present including when said locking means (66) is in said tool disengagement position to facilitate correct engagement of the tool by said member (44) upon insertion of the tool.

Claim 3

A tool holder as claimed in Claim 1 characterized in that said locking means comprises a collar (66).

Claim 4

A tool holder as claimed in Claim 1 or 2, characterized in that said slot (24) has an axial length longer than that of said member (44) and said member is axially movable along said slot, and including a second spring (62) for resiliently urging said locking means (66) in said one axial direction and resiliently urging said member (44) to the end of said slot nearest the tip of the tool when present.

Claim 5

A tool holder as claimed in Claim 1, 2, or 3 characterized in that said sleeve (8) has a second axially disposed closed-ended slot (25), and including a second member (44) extending inwardly into said second slot and resiliently urged inwardly by said inwardly urging spring (56).

Claim 6

A tool holder having a sleeve open at one end at least and adapted to receive a tool, said sleeve being rotatable about a central axis and having a wall with at least two closed-ended slots therein, characterized in that it comprises: a key (44) associated with each slot and having a shoulder portion (52) and a protrusion.(54), and being movable radially inwardly and outwardly in its respective slot with said shoulder.portion (52) limiting inward movement; a locking collar (66) encircling said sleeve (8) and having an internal surface at least a portion (70) of which diverges outwardly over at least a part of its length in an axial direction of said sleeve, and being axially movable relative to said sleeve, movement in one axial direction causing said surface portion (70) to engage said protrusions (54) and lock said keys (44) in engagement with the tool when present, and movement in the opposite axial direction allowing said keys (44) to move outwardly during entry and withdrawal of the tool into and from said sleeve; and a first spring (62) biasing said collar against axial movement.

Claim 7

A tool holder having a sleeve open at one end at least and adapted to receive a tool, said sleeve being rotatable about a central axis and having a wall with at least two closed-ended slots therein, characterized in that it comprises: a key (44) associated with each slot and having a shoulder portion (52) and a protrusion.(54), and being movable radially inwardly and outwardly in its respective slot with said shoulder.portion (52) limiting inward movement; a locking collar (66) encircling said sleeve (8) and having an internal surface at least a portion (70) of which diverges outwardly over at least a part of its length in an axial direction of said sleeve, and being axially movable relative to said sleeve, movement in one axial direction causing said surface portion (70) to engage said protrusions (54) and lock said keys (44) in engagement with the tool when present, and movement in the opposite axial direction allowing said keys (44) to move outwardly during entry and withdrawal of the tool into and from said sleeve; and a first spring (62) biasing said collar against axial movement.

Claim 8

A tool holder as claimed in Claim 5, characterized in that a second spring (56) in the form of a flat strip encircles said sleeve and has at least two apertures therein, said protrusions (54) engaging said apertures to facilitate location of said keys (44), and said second spring (56) urging said keys inwardly and yieldably allowing outward movement of said keys during entry and withdrawal of the tool.

Claim 9

A tool holder as claimed in Claim 5 or 6, characterized in that said slots (24, 25) have an axial length greater than that of said keys (44) and said keys are axially movable relative to said slots, said first spring (62) urging said keys towards the end of said slots nearest the tip of the tool when present.

Claim 10

A tool holder having a sleeve adapted to receive therein and rotatably drive a tool, and having a wall with an axially disposed closed-ended slot therein, characterized in that it comprises: a key (44.) associated with said slot and being movable radially inwardly and outwardly in said slot; a collar (66) encircling said sleeve and having an internal surface at least a portion (70) of which diverges progressively outwardly in an axial direction of said sleeve, and being axially movable relative to said sleeve, movement in a first axial direction causing said surface portion (70) to engage said key (44) and lock said key radially inwardly in engagement with the tool when present, and movement in the opposite direction allowing said key (44) to move outwardly during entry and withdrawal of the tool into and from said sleeve; and a spring (62) biasing said collar in said first axial direction; the relationship between said internal surface (70) and said key (44) being such that when different acceptable tools having axial driving recesses of different depth are inserted in said sleeve, movement of said collar (66) in said first axial direction to lock said key (44) in engagement with the tool presented continues until said key (44) penetrates the driving recess presented for adequate driving engagement therewith.

Claim 11

A tool holder having a sleeve adapted to receive therein and rotatably drive a tool, and having a wall with an axially disposed closed-ended slot therein, characterized in that it comprises: a key (44.) associated with said slot and being movable radially inwardly and outwardly in said slot; a collar (66) encircling said sleeve and having an internal surface at least a portion (70) of which diverges progressively outwardly in an axial direction of said sleeve, and being axially movable relative to said sleeve, movement in a first axial direction causing said surface portion (70) to engage said key (44) and lock said key radially inwardly in engagement with the tool when present, and movement in the opposite direction allowing said key (44) to move outwardly during entry and withdrawal of the tool into and from said sleeve; and a spring (62) biasing said collar in said first axial direction; the relationship between said internal surface (70) and said key (44) being such that when different acceptable tools having axial driving recesses of different depth are inserted in said sleeve, movement of said collar (66) in said first axial direction to lock said key (44) in engagement with the tool presented continues until said key (44) penetrates the driving recess presented for adequate driving engagement therewith.

Claim 12

A tool holder as claimed in Claim 8, characterized in that said key (44) has a blade portion engaged in said slot with parallel sides (18) and an inner face (48), the ends (50) of said inner face (48) being radiused to facilitate outward movement of said key during insertion and withdrawal of tools.

Claim 13

A tool holder for a rotary hammer having a rotatable drive sleeve adapted to receive therein a tool and having a wall with a closed-ended slot therein, characterized in that it comprises: a key (44) having a blade portion (18) slidable radially inwardly and outwardly in said slot, and a shoulder portion (52) exterior to said slot for limiting inward movement of said blade portion, said blade portion (18) having a length in the axial direction of said sleeve less than that of said slot and being slidable axially along said slot; a collar (66) encircling said sleeve and having an internal surface at least a portion (70) of which diverges progressively outwardly in said axial direction, and being axially movable relative to said sleeve, movement in a first axial direction causing said surface portion (70) to progressively engage said key (44) and lock said key radially inwards in engagement with the tool when present, and movement in the opposite direction allowing said key (44) to move outwardly during insertion and withdrawal of the tool into and from said sleeve; a selector ring (28) encircling said sleeve and having a stop member (30), and being rotatable about said sleeve, said stop member having two stop surfaces (34, 36) axially and radially displaced with respect to each other, rotation of said selector ring enabling one or the other of said stop surfaces to cooperate with said slot to determine its effective length, whereby said slot has a shorter effective length and a longer effective length, respectively; and a spring (62) biasing said collar (66) axially away from said stop member (30); the arrangement being such that when the tool is present and said slot has said shorter effective length, said key (44) is retained by said stop member (30) at the end of said slot nearest the tip of the tool, and when said slot has said longer effective length said key slides axially along said slot to the opposite end upon the tip of the tool being pushed against a work surface, whereby the tool can be respectively disengaged from and engaged in a hammer mode of the rotary hammer.

Claim 14

A tool holder for a rotary hammer having a rotatable drive sleeve adapted to receive therein a tool and having a wall with a closed-ended slot therein, characterized in that it comprises: a key (44) having a blade portion (18) slidable radially inwardly and outwardly in said slot, and a shoulder portion (52) exterior to said slot for limiting inward movement of said blade portion, said blade portion (18) having a length in the axial direction of said sleeve less than that of said slot and being slidable axially along said slot; a collar (66) encircling said sleeve and having an internal surface at least a portion (70) of which diverges progressively outwardly in said axial direction, and being axially movable relative to said sleeve, movement in a first axial direction causing said surface portion (70) to progressively engage said key (44) and lock said key radially inwards in engagement with the tool when present, and movement in the opposite direction allowing said key (44) to move outwardly during insertion and withdrawal of the tool into and from said sleeve; a selector ring (28) encircling said sleeve and having a stop member (30), and being rotatable about said sleeve, said stop member having two stop surfaces (34, 36) axially and radially displaced with respect to each other, rotation of said selector ring enabling one or the other of said stop surfaces to cooperate with said slot to determine its effective length, whereby said slot has a shorter effective length and a longer effective length, respectively; and a spring (62) biasing said collar (66) axially away from said stop member (30); the arrangement being such that when the tool is present and said slot has said shorter effective length, said key (44) is retained by said stop member (30) at the end of said slot nearest the tip of the tool, and when said slot has said longer effective length said key slides axially along said slot to the opposite end upon the tip of the tool being pushed against a work surface, whereby the tool can be respectively disengaged from and engaged in a hammer mode of the rotary hammer.

Claim 15

A tool holder as claimed in Claim 10,., characterized in that a carrier member (58) is rotatably mounted on said stop member (30) and has a first part of a detent mechanism, said carrier member being urged against said selector ring (28) by said spring (62); and wherein said selector ring has a second part (40) of said detent mechanism cooperative with said first part to releasably restrain said selector ring from rotation relative to said sleeve when either of said stop surfaces (34, 36) is in operative position.

Claim 16

A tool holder as claimed in Claim 10 or 11, characterized in that said collar (66) has a bore (108) therethrough and an outwardly divergent slot (110) in communication with said bore, said outwardly divergent slot (110) having a bottom surface (106) inclined outwardly in the axial direction away from said stop member, said bottom surface (106) forming said surface portion; and wherein said key has an outer surface (102) inclined outwardly in the same axial direction, said outer surface (102) engaging in said outwardly divergent slot (110) and slidably contacting said bottom surface (106).

Claim 17

A rotary hammer having a motor; a sleeve open at both ends and adapted to receive through one end a tool, and having at least one closed-ended slot disposed axially along part of its length; transmission means operative between said motor and said sleeve for rotating said sleeve about its axis; and a beat piece reciprocally movable in said sleeve, characterized in that it comprises:

Claim 18

A rotary hammer having a motor; a sleeve open at both ends and adapted to receive through one end a tool, and having at least one closed-ended slot disposed axially along part of its length; transmission means operative between said motor and said sleeve for rotating said sleeve about its axis; and a beat piece reciprocally movable in said sleeve, characterized in that it comprises:

Claim 19

a key (44) having a blade portion (18) slidable radially inwardly and outwardly in said slot (24); said blade portion having a length in the axial direction of said sleeve (8) less than that of said slot and being slidable axially along said slot; a collar (66) encircling said sleeve and having an internal surface at least a portion (70) of which diverges progressively outwardly in an axial direction, and being axially movable relative to said sleeve, movement in one axial direction causing said surface portion (70) to engage said key (44) and lock said key radially inwardly in engagement with the tool when present, said surface portion (70) enabling said key to penetrate inwardly different distances to accommodate tools having driving recesses therein of different depth, and movement in the opposite axial direction allowing said key to move outwardly during entry and withdrawal of the tool into and from said sleeve; a selector ring (58) encircling said sleeve and having a stop member (30) and being rotatable about said sleeve, said stop member having two stop surfaces ( 3 4, 36) axially and radially displaced with respect to each other, rotation of said selection ring enabling one or other of said stop surfaces to cooperate with said slot to determine its effective length whereby said slot has a shorter effective length and a longer effective length, respectively; and a spring (62) biasing said collar (66) axially away from said stop member (30);. the axial relationship between said slot (24), said key (44), said stop surfaces (34, 36), and said beat piece (12) being such that when the tool is present and said slot has said shorter effective length, said key is retained by said stop member at the end of said slot nearest the tip of the tool to hold the tool out of engagement with said beat piece and piace said rotary hammer in a non-hammer mode, and when said slot has said longer effective length said key slides axially along said slot to the opposite end, upon the tip of the tool being pushed against a work surface, to move the tool into engagement with said beat piece and place said rotary hammer in a hammer mode, and upon removal of the tool tip from the work surface said spring returns said key to said slot end nearest the tool tip so disengaging the tool from said beat piece.

Claim 20

a key (44) having a blade portion (18) slidable radially inwardly and outwardly in said slot (24); said blade portion having a length in the axial direction of said sleeve (8) less than that of said slot and being slidable axially along said slot; a collar (66) encircling said sleeve and having an internal surface at least a portion (70) of which diverges progressively outwardly in an axial direction, and being axially movable relative to said sleeve, movement in one axial direction causing said surface portion (70) to engage said key (44) and lock said key radially inwardly in engagement with the tool when present, said surface portion (70) enabling said key to penetrate inwardly different distances to accommodate tools having driving recesses therein of different depth, and movement in the opposite axial direction allowing said key to move outwardly during entry and withdrawal of the tool into and from said sleeve; a selector ring (58) encircling said sleeve and having a stop member (30) and being rotatable about said sleeve, said stop member having two stop surfaces ( 3 4, 36) axially and radially displaced with respect to each other, rotation of said selection ring enabling one or other of said stop surfaces to cooperate with said slot to determine its effective length whereby said slot has a shorter effective length and a longer effective length, respectively; and a spring (62) biasing said collar (66) axially away from said stop member (30);. the axial relationship between said slot (24), said key (44), said stop surfaces (34, 36), and said beat piece (12) being such that when the tool is present and said slot has said shorter effective length, said key is retained by said stop member at the end of said slot nearest the tip of the tool to hold the tool out of engagement with said beat piece and piace said rotary hammer in a non-hammer mode, and when said slot has said longer effective length said key slides axially along said slot to the opposite end, upon the tip of the tool being pushed against a work surface, to move the tool into engagement with said beat piece and place said rotary hammer in a hammer mode, and upon removal of the tool tip from the work surface said spring returns said key to said slot end nearest the tool tip so disengaging the tool from said beat piece.

Claim 21

A rotary hammer as claimed in Claim 13, characterized in that it has a second spring (56) resiliently biasing said key (44) inwardly to an inward position in the absence of the tool, and into contact with the tool during insertion of the tool into said sleeve.

Claim 22

A tool holder for a rotary hammer having a rotatable drive sleeve with a closed-ended slot disposed axially along part of its length, the sleeve being adapted to receive therein a tool, characterized in that it comprises: a member (44) movable inwardly and outwardly in said slot.(24) and having a length in the axial direction of said sleeve (8) less than that of said slot and being slidable axially along said slot; stop means (30) rotatable about said sleeve and . having two stop surfaces (34, 36) axially and radially displaced with respect to each other, rotation of said stop means enabling one (34) or the other (36) of said stop surfaces to cooperate with said slot (24) to determine its effective length, whereby said slot has a shorter effective length and a longer effective length, respectively; a collar (66) encircling said sleeve and movable relative to said sleeve for locking said member (44) inwardly in engagement with said tool when present to retain said tool, and also movable to a position to allow disengagement of the tool; the axial relationship between said slot (24), said member (44) and said stop surfaces (34, 36) being such that when the tool is present and said slot has said shorter effective length, said member is retained by said stop means adjacent the end of said slot nearest the tip of the tool, and when said slot has said longer effective length said member slides along said slot to the opposite end upon the tip of the tool being pushed against a work surface, whereby the tool can be respectively disengaged from and engaged in a hammer mode of the rotary hammer

Claim 23

A tool holder for a rotary hammer having a rotatable drive sleeve with a closed-ended slot disposed axially along part of its length, the sleeve being adapted to receive therein a tool, characterized in that it comprises: a member (44) movable inwardly and outwardly in said slot.(24) and having a length in the axial direction of said sleeve (8) less than that of said slot and being slidable axially along said slot; stop means (30) rotatable about said sleeve and . having two stop surfaces (34, 36) axially and radially displaced with respect to each other, rotation of said stop means enabling one (34) or the other (36) of said stop surfaces to cooperate with said slot (24) to determine its effective length, whereby said slot has a shorter effective length and a longer effective length, respectively; a collar (66) encircling said sleeve and movable relative to said sleeve for locking said member (44) inwardly in engagement with said tool when present to retain said tool, and also movable to a position to allow disengagement of the tool; the axial relationship between said slot (24), said member (44) and said stop surfaces (34, 36) being such that when the tool is present and said slot has said shorter effective length, said member is retained by said stop means adjacent the end of said slot nearest the tip of the tool, and when said slot has said longer effective length said member slides along said slot to the opposite end upon the tip of the tool being pushed against a work surface, whereby the tool can be respectively disengaged from and engaged in a hammer mode of the rotary hammer

Claim 24

A tool holder as claimed in Claim 15, characterized in that said collar (66) is axially movable relative to said sleeve (8), and in that there is included a spring (62) resiliently urging said member (44) away from said stop means (30).

Claim 25

A tool holder as claimed in Claim 16, characterized in that said member (44) has a blade portion (18) engaged in said slot with parallel sides and an inner face 48, and a shoulder portion (52) exterior to said slot (24) for limiting inward movement of said member, the ends (50) of said inner face (48) being shaped to facilitate outward movement of said member during insertion and withdrawal of tools.

Claim 26

A tool holder as claimed in Claim 17, characterized in that said stop means (30) comprises a cylindrical part (30) rotatably mounted on said sleeve (8) and having a slot (32) therein open at one end, said one stop surface (34) being adjacent the open end of said open-ended slot (32) and said other stop surface (36) being at the closed end of said open-ended slot (32).