Tool-bit magazine for hand tool

Description

[0001] This invention relates to a hand tool having a handle, such as screwdrivers and other hand tools which may have replaceable tool-bits.

[0002] A large variety of fastening screws of various sizes, with different head types, e.g. slotted, Phillips, and Posidriv, are in use nowadays. These require a corresponding variety of screwdrivers or screwdriver bits. Bits may be selected from a storage unit and transferred to the chuck of a hand tool such as a cordless motorized screwdriver. The user has to remember to return the bits to the storage unit. It is inconvenient to use a succession of different bits at a location remote from the storage unit.

[0003] There are a large number of multi-bit screwdrivers on the market. Many of these store the bits loosely in a compartment in the handle, in which the bits may rattle noisily. In order to locate a particular bit it is usually necessary to removal all the bits from the compartment and to sort through them. Other multi-bit screwdrivers have the bits attached releasably to the front of the handle, in which case they are easily dislodged inadvertently.

[0004] US-A- 4 273 173 discloses a hand tool in accordance with the pre-characterising part of claim 1. The hand tool disclosed has a tool-bit magazine with a body, integral with a handle, a sleeve rotatable to a position in which an aperture in the sleeve is in register with a recess in the body and thereby permits a tool-bit to be removed from or inserted into that recess.

[0005] The present invention provides a hand tool as set forth in claim 1.

[0006] The invention will be described further, by way of example only, with reference to the accompanying drawings, in which:

Figure 1 is a side view of a multi-bit screwdriver incorporating a tool-bit magazine;

Figures 2a and 2b are axial sections through the magazine;

Figure 3 is a cross-section through the magazine;

Figure 4 is a side view of a preferred embodiment of the screwdriver;

Figure 5 is an axial section through the screwdriver of Figure 4; and

Figure 6 is a cross-section through a ratchet mechanism in the screwdriver of Figure 4.

[0007] The screwdriver has a steel bar or shaft 1 which extends from one end of a composite plastics handle 2 having a hard polypropylene core. The bar is press formed with two longitudinal ribs (not visible) which retain the shaft 1 in the handle after the shaft has been pressed into the handle. The distal end of the shaft has a hexagonal recess 3 for receiving the hexagonal stub of a conventional tool-bit. A permanent magnet 4 is fixed in the base of the hexagonal recess 3 in order to retain the bit in use.

[0008] A tool-bit magazine 6 is mounted on the proximal end of the shaft 1. It has a body 7 with peripheral elongate recesses 8 for accommodating tool bits 9, one of which is visible in Figure 1. The recesses 8 are spaced around the common axis 11 of the shaft 1 and the body 7 and they extend generally in the axial direction.

[0009] The body 7 has an axial bore 12 which is a sliding fit on the shaft 1. A radially inwardly projecting portion 13 of the body 7 engages in a circumferential groove 14 machined in the shaft 1, in order to retain the body 7 on the shaft 1. A bevel 13a on the inside edge of the projecting portion 13 allows the body 7 to be pushed on to the shaft 1. The rear end surface 16 of the body abuts against the front end surface 17 of the handle. The front end of each recess 8 is defined by a wall surface 8a sloping outwards away from the other end, which is open and which is covered by the front end surface 17 of the handle.

[0010] A sleeve 18 prevents escape of the bits 9 from the recesses 8. The sleeve 18 is mounted in a circumferential recess 19 in the body 7 so as to be rotatable to respective positions in which an aperture constituted by an open-ended slot 21 in the sleeve 18 is in register with a respective one of the recesses 8, thereby permitting a bit 9 to be inserted into that recess or removed from that recess (by allowing it to fall out under gravity). Since both the body 7 and the sleeve 18 are rotatable relative to the rest of the tool, it is necessary to hold one of them with one hand while the other hand rotates the other of them. For facilitate this, the body 7 and the sleeve 18 are provided with external ribs 7a and 18a respectively. Since the whole magazine 6 is rotatable, the shaft 1 can be guided firmly by one hand while the other hand rotates the handle 2, without any risk of the sleeve 18 being turned independently of the body 7 and inadvertently freeing the bits during use of the screwdriver.

[0011] As can be seen from Figure 1 particularly, the sleeve 18 only covers about half of the length of the recesses 8, with the result that the front ends of the bits 9 are visible so that they can be easily identified and selected. The rear end of the bit 9 rests against the front end surface 17 of the handle 2 and its tip rests against the sloping surface 8a. Rattling of the bits 9 in the recess 8 is prevented by flanges 22 which are formed integral with the body 7 and which are resiliently deformed by the bits 9 so that the bits are retained between the flanges 22 and the sleeve 18. As shown in Figure 3, the hexagonal stub of the bit 9 is able to adopt different angular positions, two of which are indicated in solid line and chain line respectively.

[0012] In order to enable the sleeve 18 to be indexed and located in the respective positions in which the slot 21 registers with the respective recesses 8, a spring loaded ball 23 mounted in a radial bore in the body 7 cooperates with a circumferential series of part-spherical notches 24 in the sleeve 18.

[0013] Various modifications may be made within the scope of the invention. For example, a reversible ratchet mechanism for transmitting rotation from the handle 2 to the shaft 1 may be interposed between the magazine 6 and the handle 2.

[0014] Figures 4 to 6 show a preferred embodiment of the screwdriver, in which parts similar to those described above are given the same reference numerals. The screwdriver has a tool-bit magazine 6 with a body 7 having recesses 8 accommodating tool bits 9. The body 7 has an axial bore which is a sliding fit on the shaft 1. A portion 13 of the body 7 engages in a circumferential groove 14 machined in the shaft 1. A sleeve 18 is mounted in a circumferential recess 19 in the body 7 so as to be rotatable to respective positions in which a slot 21 is in register with a respective recess 8, to permit insertion or removal of a bit 9. A spring loaded ball 23 mounted on the body 7 engages in a circumferential series of notches in the sleeve 18

[0015] The screwdriver shown in Figures 4 to 6 also has a ratchet mechanism 51 between the magazine 6 and the handle 2. The ratchet mechanism has a body 62 with a bore 56 receiving the shaft 1 which is formed with a spur gear 57 engageable by pawls 58a and 58b which are tiltable about axes parallel to the shaft axis 11. A control sleeve 64 is linked to a control member 66 carrying a leaf spring 76 with legs 76a and 76b which bear on the pawls 58a and 58b respectively. The control sleeve 64 is movable clockwise and anticlockwise from the intermediate position shown in Figure 6, in which both pawls 58a and 58b and engaged with the gear 57, to respective ratcheting positions in which only one or the other of the pawls is engaged with the gear 57.

[0016] The rear end surface 16 of the magazine body 7 abuts against the front surface of the body 62, against which the rear ends of the bits 9 rest. The tips of the bits 9 rest against sloping front end surfaces 8a of the recesses 8.

[0017] The ratchet mechanism 51 is described in more detail in our U.K. Patent Application No. 9816878.4 filed 3 August 1998, published as GB-A- 2 340199 on 16 Feb 2000.

Claims

1. A hand tool having a handle (2), a shaft (1) extending from a front end of the handle (2), a front end portion of the shaft (1) being adapted to mount a replaceable tool-bit, and a tool-bit magazine (6) comprising a body (7) having a plurality of elongate recesses (8) for accommodating respective tool-bits (9), the recesses (8) being spaced around the longitudinal axis (11) of the shaft (1) and extending generally in the axial direction, the elongate recesses (8) being open at the periphery of the body (7), and a sleeve (18) which is mounted on the body (7) so as to prevent escape of the tool-bits (9) from the elongate recesses (8) while leaving the tool-bits (9) partly visible at front end portions of the elongate recesses (8), the sleeve (18) having an aperture (21) open at the periphery and being rotatable relative to the body (7) to a position in which the aperture (21) in the sleeve (18) is in register with one of the elongate recesses (8) and thereby permits a tool-bit (9) to be removed from or inserted into that elongate recess (8) in a direction transverse to the axial direction, characterised in that the body (7) is separate from the handle (2) and is mounted on a rear end portion of the shaft (1), which extends through the body (7), a rear end portion of the body (7) having a circumferential recess (19) which is open towards the handle (2), the sleeve (18) being mounted in the circumferential recess (19), surrounding the rear end portion of the body, and in that the aperture (21) is constituted by an open-ended slot which is open at the front end of the sleeve (18).

2. A hand tool as claimed in claim 1, in which the front end of each elongate recess (8) is defined by a wall surface (8a) which slopes outwards and forwards.

3. A hand tool as claimed in claim 1 or 2, in which the magazine (6) is rotatable relative to the shaft (1) and the handle (2).

4. A hand tool as claimed in claim 3, in which the body (7) has a radially inwardly projecting part (13) engaging in a circumferential groove (14) in the shaft (1).

5. A hand tool as claimed in any preceding claim, including indexing means (23,24) for locating the sleeve (18) in respective positions in which the aperture (21) is in register with respective elongate recesses (8).

6. A hand tool as claimed in claim 5, in which the indexing means comprises a spring-loaded element (23) mounted on the body (7) and cooperating with a circumferential series of notches (24) in the sleeve (18).

7. A hand tool as claimed in any preceding claim, including at least one resiliently deformable member (22) in each elongate recess (8), the member (22) being deformed by the tool-bit (9) when inserted into the elongate recess (8), thereby to prevent rattling of the tool-bit (9).

8. A hand tool as claimed in claim 7, in which the said member is a flange (22) integral with the body (7).

9. A band tool as claimed in any preceding claim, in which the aperture (21) is not open at the rear end of the sleeve (18).

Ansprüche

1. Handwerkzeug mit einem Griff (2), einem Schaft (1), der sich von einem Vorderende des Griffs (2) erstreckt, wobei ein vorderer Endabschnitt des Schafts (1) dafür geeignet ist, eine austauschbare Werkzeugspitze anzubringen, und einem Werkzeugspitzenmagazin (6), das einen Körper (7) mit einer Vielzahl von länglichen Aussparungen (8) zum Aufnehmen entsprechender Werkzeugspitzen (9) umfaßt, wobei die Aussparungen (8) mit Zwischenraum um die Längsachse (11) des Schafts (1) angeordnet werden und sich allgemein in der Axialrichtung erstrecken, wobei die länglichen Aussparungen (8) am Umfang des Körpers (7) offen sind, und einer Manschette (18), die am Körper (7) angebracht wird, um so ein Entweichen der Werkzeugspitzen (9) aus den länglichen Aussparungen (8) zu verhindern, während sie die Werkzeugspitzen (9) an vorderen Endabschnitten der länglichen Aussparungen (8) teilweise sichtbar lässt, wobei die Manschette (18) eine Öffnung (21) hat, die am Umfang offen ist und im Verhältnis zum Körper (7) gedreht werden kann, zu einer Position, in der die Öffnung (21) in der Manschette (18) in Ausrichtung mit einer der länglichen Aussparungen (8) ist und dadurch ermöglicht, daß eine Werkzeugspitze (9) in einer Richtung quer zur Axialrichtung aus dieser länglichen Aussparung (8) entnommen oder in dieselbe eingesetzt wird, dadurch gekennzeichnet, daß der Körper (7) vom Griff (2) getrennt ist und an einem hinteren Endabschnitt des Schafts (1) angebracht wird, der sich durch den Körper (7) erstreckt, wobei ein hinterer Endabschnitt des Körpers (7) eine umlaufende Aussparung (19) hat, die zum Griff (2) hin offen ist, wobei die Manschette (18) in der umlaufenden Aussparung (19) angebracht wird und den hinteren Endabschnitt des Körpers umschließt, und dadurch, daß die Öffnung (21) durch einen offenendigen Schlitz dargestellt wird, der am Vorderende der Manschette (18) offen ist.

2. Handwerkzeug nach Anspruch 1, bei dem das Vorderende jeder länglichen Aussparung (8) durch eine Wandfläche (8a) definiert wird, die nach außen und nach vom abfällt.

3. Handwerkzeug nach Anspruch 1 oder 2, bei dem das Magazin (6) im Verhältnis zu dem Schaft (1) und dem Griff (2) gedreht werden kann.

4. Handwerkzeug nach Anspruch 3, bei dem der Körper (7) einen in Radialrichtung nach innen vorstehenden Teil (13) hat, der in eine umlaufende Nut (14) im Schaft (1) eingreift.

5. Handwerkzeug nach einem der vorhergehenden Ansprüche, das Rastmittel (23, 24) einschließt, um die Manschette in entsprechenden Positionen zu positionieren, in denen die Öffnung (21) in Ausrichtung mit entsprechenden länglichen Aussparungen (8) ist.

6. Handwerkzeug nach Anspruch 5, bei dem das Rastmittel ein gefedertes Element (23) umfaßt, das am Körper (7) angebracht wird und mit einer umlaufenden Reihe von Kerben (24) in der Manschette (18) zusammenwirkt.

7. Handwerkzeug nach einem der vorhergehenden Ansprüche, das in jeder länglichen Aussparung (8) wenigstens ein elastisch verformbares Element (22) einschließt, wobei das Element (22) durch die Werkzeugspitze (9) verformt wird, wenn sie in die längliche Aussparung (8) eingesetzt wird, um dadurch ein Klappern der Werkzeugspitze (9) zu verhindern.

8. Handwerkzeug nach Anspruch 7, bei dem das Element ein mit dem Körper (7) integrierter Flansch (22) ist.

9. Handwerkzeug nach einem der vorhergehenden Ansprüche, bei dem die Öffnung (21) am hinteren Ende der Manschette (18) nicht offen ist.

Revendications

1. Outil à main comportant un manche (2), un arbre (1) s'étendant à partir d'une extrémité avant du manche (2), une partie d'extrémité avant de l'arbre (1) servant au montage d'un embout d'outil remplaçable, et un magasin d'embouts d'outil (6) comprenant un corps (7) comportant plusieurs évidements allongés (8) destinés à recevoir des embouts d'outil respectifs (9), les évidements (8) étant espacés autour de l'axe longitudinal (11) de l'arbre (1) et s'étendant en général dans la direction axiale, les évidements allongés (8) étant ouverts au niveau de la périphérie du corps (7), et un manchon (18) monté sur le corps (7), destiné à empêcher un échappement des embouts d'outil (9) des évidements allongés (8), les embouts d'outil (9) restant en partie visibles au niveau des parties d'extrémité avant des évidements allongés (8), le manchon (18) comportant une ouverture (21) ouverte au niveau de la périphérie et pouvant tourner par rapport au corps (7) vers une position dans laquelle l'ouverture (21) dans le manchon (18) est alignée avec un des évidements allongés (8), permettant ainsi le retrait d'un embout d'outil (9) de l'évidement allongé (8) ou son insertion correspondante, dans une direction transversale par rapport à la direction axiale, caractérisé en ce que le corps (7) est séparé du manche (2) et est monté sur une partie d'extrémité arrière de l'arbre (1), s'étendant à travers le corps (7), une partie d'extrémité arrière du corps (7) comportant un évidement circonférentiel (19) ouvert vers le manche (2), le manchon (18) étant monté dans l'évidement circonférentiel (19), entourant la partie d'extrémité arrière du corps, et en ce que l'ouverture (21) est constituée par une fente à extrémités ouvertes, ouverte au niveau de l'extrémité avant du manchon (18).

2. Outil à main selon la revendication 1, dans lequel l'extrémité avant de chaque évidement allongé (8) est définie par une surface de paroi (8a) inclinée vers l'extérieur et vers l'avant.

3. Outil à main selon les revendications 1 ou 2, dans lequel le magasin (6) peut tourner par rapport à l'arbre (1) et au manche (2).

4. Outil à main selon la revendication 3, dans lequel le corps (7) comporte une partie débordant radialement vers l'intérieur (13), s'engageant dans une rainure circonférentielle (14) dans l'arbre (1).

5. Outil à main selon l'une quelconque des revendications précédentes, englobant un moyen d'indexation (23, 24) pour positionner le manchon (18) dans des positions respectives dans lesquelles l'ouverture (21) est alignée avec les évidements allongés respectifs (8).

6. Outil à main selon la revendication 5, dans lequel le moyen d'indexation comprend un élément chargé par ressort (23) monté sur le corps (7) et coopérant avec une série d'encoches circonférentielles (24) dans le manchon (18).

7. Outil à main selon l'une quelconque des revendications précédentes, englobant au moins un élément à déformation élastique (22) dans chaque évidement allongé (8), l'élément pouvant être déformé par l'embout d'outil (9) lors de l'insertion dans l'évidement allongé (8), pour empêcher ainsi un cliquetis de l'embout d'outil (9).

8. Outil à main selon la revendication 7, dans lequel ledit élément est constitué par une bride (22) faisant partie intégrante du corps (7).

9. Outil à main selon l'une quelconque des revendications précédentes, dans lequel l'ouverture (21) n'est pas ouverte au niveau de l'extrémité arrière du manchon (18).

Drawing